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  • 201.
    Eriksson, Therese
    et al.
    Linköping University, Department of Medicine and Health Sciences, Pharmacology . Linköping University, Faculty of Health Sciences.
    Svensson, Samuel
    Linköping University, Department of Medicine and Care, Pharmacology. Linköping University, Faculty of Health Sciences.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Persson, Karin
    Linköping University, Department of Medicine and Health Sciences, Pharmacology . Linköping University, Faculty of Health Sciences.
    Andersson, Tony
    Landstinget i Kronoberg.
    Andersson, Rolf
    Linköping University, Department of Medicine and Care, Pharmacology. Linköping University, Faculty of Health Sciences.
    Panax ginseng induces anterograde transport of pigment organelles in Xenopus melanophores2008In: Journal of Ethnopharmacology, ISSN 0378-8741, E-ISSN 1872-7573, Vol. 119, no 1, p. 17-23Article in journal (Refereed)
    Abstract [en]

    Melanophores from Xenopus laevis are pigmented cells, capable of quick colour changes through cyclic adenosine 3':5'-monophosphate (cAMP) coordinated transport of their intracellular pigment granules, melanosomes. In this study we use the melanophore cell line to evaluate the effects of Panax ginseng extract G115 on organelle transport. Absorbance readings of melanophore-coated microplates, Correlate-EIA direct cAMP enzyme immunoassay kit, and western blot were used to measure the melanosome movement and changes in intracellular signalling. We show that Panax ginseng induces a fast concentration-dependent anterograde transport of the melanosomes. No significant increase in the cAMP level was seen and pre-incubation of melanophores with the protein kinase C (PKC) inhibitor EGF-R Fragment 651-658 (M-EGF) only partly decreased the ginseng-induced dispersion. We also demonstrate that Panax ginseng, endothelin-3 (ET-3) and alpha-melanocyte stimulating hormone (MSH) stimulate an activation of mitogen activated protein kinase (MAPK). Pre-incubation with M-EGF decreased the MAPK activity induced by ET-3 and MSH, but again only marginally affected the response of Panax ginseng. Thus, in melanophores we suggest that Panax ginseng stimulates an anterograde transport of pigment organelles via a non-cAMP and mainly PKC-independent pathway.

  • 202.
    Erlandsson, Ragnar
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Apell, P
    Linkoping Univ, Dept Phys & Measurement Technol, Appl Phys Lab, S-58183 Linkoping, Sweden Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden Univ Gothenburg, S-41296 Gothenburg, Sweden.
    Progress in scanning probe microscopy: High resolution force microscopy and spectroscopy2000In: Current Science, ISSN 0011-3891, Vol. 78, no 12, p. 1445-1457Article in journal (Refereed)
    Abstract [en]

    During the last few years the Atomic Force Microscope (AFM) has become capable of routinely obtaining atomic resolution when operated with a vibrating cantilever (ac-mode). Local measurement of the tip-sample force (force spectroscopy) is a powerful tool for investigations of contact phenomena at the atomic scale that are important in fields like friction, tribology, atom manipulation and chemical bond formation. This paper reviews several aspects of the AFM technique such as tip-surface forces, force sensors, operation modes and contrast effects. A study of the Si(111)7 x 7 reconstruction is presented as an example of high resolution AFM imaging.

  • 203.
    Erlandsson, Ragnar
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, Faculty of Science & Engineering.
    Elwing, Hans
    Eriksson, Mats
    Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, Faculty of Science & Engineering.
    Olsson, Lars
    Linköping University, Department of Medical and Health Sciences. Tekniska högskolan.
    Tengvall, Pentti
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Wigren, Roger
    Welin Klintström, Stefan
    Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, Faculty of Science & Engineering.
    Scanning force microscopy - examples of applications to surface chemistry1992In: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 88, p. 154-161Article in journal (Refereed)
    Abstract [en]

    Some recent results from the scanning force microscopy activity at our laboratory are presented. A brief description of attractive mode force microscopy is followed by a discussion of the following examples: O2/H2-induced morphology changes in thin palladium films, structure of spin cast polysulfone films, fibrinogen adsorption on hydrophobic SiO2, and force measurements on hydrophobic/hydrophilic substrates.

  • 204.
    Erlandsson, Ragnar
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Yakimov, V.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Force interaction between a W tip and Si(111) investigated under ultrahigh vacuum conditions2000In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 62, no 20, p. 13680-13686Article in journal (Refereed)
    Abstract [en]

    The force on a W tip has been measured in ultrahigh vacuum during approach and indentation against Si(111). The maximum separation where we detect an attractive force is 5 Å, which is within the range where wave-function overlap should occur. Calculating the van der Waals force using the sphere-flat geometry and a radius of 150 Å that we determine by scanning electron microscopy overestimates the force, while a cone-shaped tip apex is consistent with our results. After contact we observe discontinuous steps in the force curve in agreement with molecular-dynamics simulations. The stiffness of the junction increases during the first 5 Å after contact and stabilizes at ~25 N/m, which is approximately a factor of 3 lower than estimated from classical elasticity theory. The maximum adhesive force is ~5 nN. We also present a model that relates the dynamic behavior of the force-feedback controller to the formation of a connective neck over the tip-surface gap.

  • 205.
    Eskhult, Jonas
    et al.
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Ulrich, Christian
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Björefors, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics . Linköping University, The Institute of Technology.
    Nyholm, Leif
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Current oscillations during chronoamperometric and cyclic voltammetric measurements in alkaline Cu(II)-citrate solutions2008In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 53, no 5, p. 2188-2197Article in journal (Refereed)
    Abstract [en]

    It is demonstrated that current oscillations can be observed during chronoamperometric and cyclic voltammetric experiments in solutions containing 0.4 M CuSO4 and 1.2 M citrate at pH 11 and 50 °C. The oscillations, which are shown to originate from local variations in the pH, result in the deposition of nanostructured Cu and Cu2O materials. It is concluded that the current oscillations are analogous to the previously described potential oscillations obtained under controlled current conditions in alkaline Cu(II)-lactate, -tartrate and -citrate solutions. Rotating disk electrode results clearly show that the reduction of the Cu(II)-complexes is kinetically controlled and that the rate of the reduction increases with increasing pH and temperature. It is also shown that the presence of a cathodic peak on the anodic scan in the cyclic voltammograms can be used to identify the experimental conditions leading to the spontaneous current (or potential) oscillations. Electrochemical quartz crystal microbalance results indicate that the cathodic peak stems from an increased rate of the reduction of the Cu(II)-citrate complexes due to a rapid increase in the local pH. This causes Cu2O rather than Cu to be deposited which, however, results in a decrease in the local pH and a decreasing current. In situ ellipsometry data confirm that Cu2O deposition replaces that of Cu in the potential region of the cathodic peak. The present findings should facilitate syntheses of nanolayered materials based on spontaneous potential or current oscillations.

  • 206.
    Fallqvist, Amie
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Macken, Stephen
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, Faculty of Science & Engineering.
    Filippini, Daniel
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Optically addressable field effect nano-environments for chemical imaging2009In: Procedia Chemistry, ISSN 1876-6196, Vol. 1, no 1, p. 224-227Article in journal (Refereed)
    Abstract [en]

    An optically addressable field effect device Incorporating functionalized nano-environments is demonstrated for the generation of multiple response signatures of a same analyte-sensing material combination. The device can operate unsupervised and different response mechanism can be simultaneously tested and incorporated in a multidimensional response. This proof of concept explores the well-known Pd-H-2 case, while the concept is a breadboard for chemical imaging experiments.

  • 207.
    Fare, T.
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Spetz, Anita
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Armgarth, M.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Quasi-static and high frequency C(V)-response of thin platinum metal—oxide—silicon structures to ammonia1988In: Sensors and Actuators, ISSN 0250-6874, Vol. 14, no 4, p. 369-386Article in journal (Refereed)
    Abstract [en]

    Quasi-static and high frequency (1 MHz) capacitance—voltage characteristics are reported for thin Pt (⩽6 nm) MOS capacitors for exposures to ammonia in a background atmosphere of 20% O2/Ar. The ammonia-induced voltage shift of the quasi-static capacitance—voltage characteristics is always greater than or equal to the shift of the high-frequency characteristics for a given ammonia concentration. We discuss the differences in the ammonia response for the case of the two different contact metals, Al or Pd. The quasi-static results can be used to show that the decreased sensitivity with Pt film thickness may be only partly related to the high impedance of the Pt film itself. Based on these results, we argue that the intrinsic ammonia sensitivity of Pt films (less than about 20 nm thick) decreases with decreasing film thickness. We also report some results for hydrogen exposure of 1.5 nm Pt films and discuss them together with complementary measurements of the film impedance. It is concluded that ammonia interacts quite differently with the thin Pt film compared to hydrogen. The findings in this paper support a recently proposed model for the ammonia sensitivity of thin catalytic metal films.

  • 208.
    Fare, T.
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Spetz, Anita
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Armgarth, M.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Reversible interaction of hydrogen with thin layers of thermally grown silicon dioxide1988In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 63, no 11, p. 5507-5513Article in journal (Refereed)
    Abstract [en]

    Some effects of hydrogen on the electrical properties of Pd‐metal‐thin (≊10 nm) oxide‐silicon capacitors are reported. High‐frequency (1 MHz) and quasistatic capacitance voltage curves are measured at 100 °C as a function of hydrogen partial pressure in a background atmosphere of 20% O2/Ar. Besides the standard hydrogen‐induced shift of the capacitance‐voltage characteristics we find: (1) an increase in the accumulation capacitance with increasing hydrogen partial pressure, and (2) a nonmonotonic increase in the quasistatic capacitance minimum with increasing hydrogen pressure. The relative increase in the accumulation capacitance is shown to be related to the square of the hydrogen‐induced voltage shift (and hence to the square of the concentration of hydrogen atoms at the Pd‐SiO2 interface). We discuss our findings, based on existing hydrogen‐silicon dioxide models, to interpret the effects of hydrogen on the high‐frequency and quasistatic capacitance characteristics.

  • 209.
    Faxälv, Lars
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Chemistry.
    Ramström, Sofia
    Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, Dublin, Ireland.
    Soutukorva, Kristina
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Health Sciences.
    Tengvall, Pentti
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Lindahl, Tomas L.
    Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Chemistry.
    The role of coagulation factor XII in propagation of coagulationManuscript (preprint) (Other academic)
    Abstract [en]

    The physiological relevance and function of coagulation factor XII (FXII), the first zymogen in the intrinsic pathway, has for a long time been a matter of debate. The aim of this study was to shed some light on the role of factor XII in thrombus formation with a focus on its effect during the propagation phase of coagulation. In order to study propagation of coagulation we utilized a new imaging method to measure propagation rates from an activating surface in both platelet-free plasma and platelet-rich plasma. The most essential results revealed that both FXII and its substrate FXI are located on the surface of activated platelets. The surface of preexisting clots does not support coagulation in a FXII dependent manner. However, we found strong evidence for an accelerated propagation of tissue factor initiated coagulation when contact activation of FXII simultaneously occurred in the proximity. In vivo sources for contact activation may be exposed subendothelial collagen as well as soluble and cell derived poly-anions. If such in vivo contact activation of FXII occurs, even though moderate, it could contribute to in vivo thrombus growth rate and thus be of pathophysiological importance.

  • 210.
    Faxälv, Lars
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Chemistry.
    Tengvall, Pentti
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Lindahl, Tomas L
    Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Chemistry.
    Imaging of blood plasma coagulation and its propagation at surfaces2008In: Journal of biomedical materials research. Part A, ISSN 1552-4965, Vol. 85, no 4, p. 1129-1134Article in journal (Refereed)
    Abstract [en]

    A new method utilizing image capture and processing was developed for the analysis of blood plasma coagulation at surfaces. The coagulation was detected in a cuvette by time-lapse image capture of light scattering from the developing fibrin network. By image processing and computer analysis of the captured image data, both early detection of coagulation at the surface and the propagation phase of coagulation could be measured in the same experiment. It is possible to use both platelet-rich plasma (PRP) and platelet-free plasma (PFP) with the method, and thereby study the platelet contribution to both surface coagulation and propagation of coagulation. Two well-known model surfaces, hydrophilic and hydrophobic glass, were used in combination with PRP and PFP to illustrate the method. Hydrophilic glass activated coagulation significantly faster (PRP: 7.0 +/- 1.7 min, PFP: 5.9 +/- 1.2 min, n= 16) than hydrophobic glass (PRP: 50 +/- 14 min, PFP: 65 +/- 32 min, n = 16) in both PRP and PFP. Hydrophilic surfaces showed a faster initial propagation of coagulation adjacent to the surface (mean velocity: 0.14 +/- 0.05 mm/ minute) compared with the propagation observed further out from the surface (mean velocity: 0.05 +/- 0.01 mm/min). The method is very flexible and can be suitable for screening hemocompatibility of biomaterials.

  • 211.
    Filippini, D.
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Fraigi, L.
    Laboratorio de Sensores, CITEI-National Institute of Industrial Technology, CC 157, 1650 San Martín, Argentina.
    Aragon, R.
    Aragón, R., Laboratorio de Películas Delgadas, Fac. de Ing., Univ. de Buenos Aires and PRINSO-CONICET-CITEFA, Paseo Colon 850, 1063 Cap. Fed., Argentina.
    Weimar, U.
    Institute of Physical and Theoretical Chemistry, University of Tübingen, auf der Morgenstelle 8, D-72076 Tübingen, Germany.
    Thick film Au-gate field-effect devices sensitive to NO22002In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 81, no 2-3, p. 296-300Article in journal (Refereed)
    Abstract [en]

    Screen printed thick film gold gate MOS capacitors are selectively sensitive to the presence of NO2 in air. Metallo-organic gold inks produce open gate structures, with positive flat-band-voltage shifts of 2.72mV/ppm at 140ppm of NO2 in air, comparable to PVD deposited thin film devices. Standard gold pastes are denser, coarser grained thick films of alloyed composition, which reverse the polarity of the flat-band-voltage shift. No cross sensitivity to H2 or NO is apparent. © 2002 Elsevier Science B.V. All rights reserved.

  • 212.
    Filippini, Daniel
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Optochemical sensing with ubiquitos platforms2007In: Optik i Sverige 2007,2007, 2007Conference paper (Refereed)
  • 213.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Alimeli, Adriano
    Università degli Studi di Roma Tor Vergata.
    Di Natale, Corrado
    Dipartiment di Ingegneria Elettronica Università degli Studi di Roma Tor Vergata.
    Paolesse, Roberto
    Università degli Studi di Roma Tor Vergata.
    DAmico, Arnaldo
    Università degli Studi di Roma Tor Vergata.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Chemical Sensing with Familiar Devices2006In: Angewandte Chemie : : a journal of the Gesellschaft Deutscher Chemiker.. International edition, Vol. 45, no 23, p. 3800-3803Article in journal (Refereed)
  • 214.
    Filippini, Daniel
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Andersson, Tony
    Linköping University, Department of Medicine and Care, Pharmacology. Linköping University, Faculty of Health Sciences.
    Svensson, Samuel
    Linköping University, Department of Medicine and Care, Pharmacology. Linköping University, Faculty of Health Sciences.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, Faculty of Health Sciences.
    Microplate based biosensing with a computer screen aided technique2003In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 19, no 1, p. 35-41Article in journal (Refereed)
    Abstract [en]

    Melanophores, dark pigment cells from the frog Xenopus laevis, have the ability to change light absorbance upon stimulation by different biological agents. Hormone exposure (e.g. melatonin or α-melanocyte stimulating hormone) has been used here as a reversible stimulus to test a new compact microplate reading platform. As an application, the detection of the asthma drug formoterol in blood plasma samples is demonstrated. The present system utilizes a computer screen as a (programmable) large area light source, and a standard web camera as recording media enabling even kinetic microplate reading with a versatile and broadly available platform, which suffices to evaluate numerous bioassays. Especially in the context of point of care testing or self testing applications these possibilities become advantageous compared with highly dedicated comparatively expensive commercial systems.

  • 215.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Bakker, Jimmy
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Optics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Fingerprinting of fluorescence substances for diagnostic purposes using computer screen illumination2004In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 106, p. 302-310Article in journal (Refereed)
  • 216.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Bakker, Jimmy
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Optics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Fingerprinting of fluorescent substances for diagnostic purposes using computer screen illumination2005In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 106, p. 302-310Article in journal (Refereed)
  • 217.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Comina, G.
    Thin Films Laboratory, Science Faculty, Universidad Nacional De Ingenieria, Lima 31, Peru.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Computer screen photo-assisted reflectance fingerprinting2005In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 107, no 2, p. 580-586Article in journal (Refereed)
    Abstract [en]

    The characterization of opaque color samples using reflected light is demonstrated with a computer screen photo-assisted technique (CSPT). CSPT utilizes standard computer screens as light sources and conventional web cameras as detectors to perform colorimetric or fluorescent evaluations that retain key spectral features of the tested substances. In this work, the fingerprinting of samples spectral reflectances is achieved by evaluating the reflected light under controlled computer screen illumination. Two different methods for processing of features are investigated, revealing complementary properties for classifications purposes. The attainable classification enables to distinguish different colors from just hues of a same color. © 2004 Elsevier B.V. All rights reserved.

  • 218.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics.
    Comina, G.
    Thin Films Laboratory Universidad National de Ingenieria, Lima, Peru.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics.
    Computer screen photo-assisted reflectance fingerprinting2004In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 107, p. 580-586Article in journal (Refereed)
  • 219.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Di Natale, C.
    Paolese, R.
    Alimelli, A.
    DAmico, A.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Home and global (bio) chemical sensing with computer screen photo-assisted techniques2006Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Konferensbidrag (muntligt) på 11th World congress on internet in medicine - Mednet 2006, Toronto, Canada, 14-19 okt.

  • 220.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Di Natale, C
    Paolesse, R
    D´Amico, A.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Distributed chemical monitoring for safety and security with computer screen photo-assissted techniques2007In: Safety and Security in Europe 2007,2007, 2007Conference paper (Refereed)
  • 221.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Di Natale, Corrado
    University of Rome, Italy.
    Paolesse, R
    Univresity of Rome, Italy.
    D´Amico, A.
    University of Rome, Italy.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Computer screen photo-assisted techniques for global monitoring of environmental and sanitary parameters2007In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 121, no 1, p. 93-102Article in journal (Refereed)
    Abstract [en]

    The computer screen photo-assisted technique (CSPT) is a measuring method that uses regular computer screens as controlled light sources and web cameras as imaging detectors for optical evaluations of sensing substances, which optical properties respond to target analytes. The fact, that CSPT uses a globally distributed and familiar infrastructure as instrumentation and that is able to serve multiple targets with the same setup, makes it an attractive candidate for home testing. This article reviews the CSPT concept and focuses in two recent studies that demonstrate thorough CSPT determinations using a handy and eventually disposable assay format, with the potential to be as ubiquitous as the CSPT platforms themselves. The implications of such combination of technologies is discussed, and its potential to support the global monitoring of environmental and sanitary parameters, using Internet geography browsers, is analyzed. © 2006 Elsevier B.V. All rights reserved.

  • 222.
    Filippini, Daniel
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Gatto, Emanuela
    University Roma Tor Vergata.
    Alimelli, Adriano
    University Roma Tor Vergata.
    Ali Malik, Muhammad
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Di Natale, Corrado
    University Roma Tor Vergata.
    Paolesse, Roberto
    University Roma Tor Vergata.
    DAmico, Arnaldo
    University Roma Tor Vergata.
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Spectral fingerprinting of porphyrins for distributed chemical sensing2009In: JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, ISSN 1088-4246, Vol. 13, no 1, p. 77-83Article in journal (Refereed)
    Abstract [en]

    Recent progress in spectral fingerprinting of fluorescent indicators using distributed instrumentation based on consumer electronic devices is reviewed. In particular, the evaluation of disposable assays using a computer screen photo-assisted technique (CSPT) is discussed. Sample identification and optimization strategies are analyzed as well as the underlying theoretical background for polychromatic spectral fingerprinting.

  • 223.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Gunnarsson, J.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Chemical image generation with a grid-gate device2004In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 96, no 12, p. 7583-7590Article in journal (Refereed)
    Abstract [en]

    Scanning light pulse technique generating distinctive chemical images of diverse gases is demonstrated using a sensing arrangement that allows unrestricted choice of sensing materials, disregarding its conductivity or morphology. The present device, a metal oxide semiconductor structure, disentangles biasing from chemical functions by providing an inert grid as a gate that supplies the proper biasing, while functional materials even in the form of disconnected clusters can be used for sensing. The reading of conductimetric chemical responses of clustered materials, in nominal operating conditions, is demonstrated by the generation of chemical images acquired for inversion biasing conditions. © 2004 American Institute of Physics.

  • 224.
    Filippini, Daniel
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Liedberg, Bo
    Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics . Linköping University, The Institute of Technology.
    SENSORS and ACTUATORS B: Chemical Special Issue: in SENSORS AND ACTUATORS B-CHEMICAL, vol 142, issue 2, pg 4052009Other (Other academic)
    Abstract [en]

    n/a

  • 225.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Adaptive illumination in computer screen assisted spectral fingerprinting2005In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 86, no 8, p. 084101-Article in journal (Refereed)
    Abstract [en]

    The computer screen photoassisted technique (CSPT) uses displays as controlled light sources for measuring spectral fingerprints of color substances, such as those present in bioassays. Here, the possibility of tuning the illuminating sequences for matching CSPT fingerprints with target spectral transmittances is demonstrated. This approach enables robust classification, orders of magnitude form mismatches, and establish a systematic method for adapting optimum illuminating sequences to any unknown measuring platform. © 2005 American Institute of Physics.

  • 226.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Chemical images generated by large area homogeneous illumination of metal-insulator-semiconductor structures2003In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 82, no 21, p. 3791-3793Article in journal (Refereed)
    Abstract [en]

    The induction of distinctive chemical images in the field-effect devices upon gas exposure by the use of a controlled large area illumination provided by a computer screen was reported. To generate two-dimensional photocurrent images, the concurrent optical and chemical modulation of the semiconductor surface potential of a single metal-oxide-semiconductor capacitor was used. It was concluded that the use of a computer screen as a programmable light source simplifies a normally complex setup.

  • 227.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Chemical imaging by a computer screen aided scanning light pulse technique2002In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 81, no 20, p. 3891-3893Article in journal (Refereed)
    Abstract [en]

    The demonstration of a scanning light pulse technique (SLPT) for the generation of selective chemical images was done. The programmable light source provided by a standard cathode-rays tube computer screen was used for this purpose. The testing of the concept was done with a metal-oxide-semiconductor capacitor with catalytic gates of platinum and palladium spatially distributed in transversal directions.

  • 228.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Chemical sensing with computer screen photo-assisted techniques2005In: Eurosensors XIX,2005, 2005Conference paper (Refereed)
  • 229.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Computer screen photo-assisted technique (CSPT) for personal and global monitoring2006Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Poster vid konferensen "Fobis Meeting", Stockholm, Sweden, 3 mars

  • 230.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics.
    Computer screen photo-assisted techniques2005In: Encyclopedia of Sensors / [ed] Craig A. Grimes, Gordon Grimes, Elizabeth E. Dickey, Michael V. Pishko, California, USA: American Scientific Publishers , 2005, p. -8000Chapter in book (Other academic)
    Abstract [en]

    The applications of sensors range from medical diagnostics to industrial manufacturing and to defense and national security applications. When an area spans such a large diversity of research, and where research from many different countries is also involved, a review of these developments becomes especially useful. Because it bridges science and technology the field also provides a desired interaction between researchers and research in technologically advanced and developing countries. The present series of volumes, "The Encyclopedia of Sensors" , the first of its kind, is intended to provide a timely compendium of the entire field. As such it can be expected to play a significant role in worldwide future progress and understanding."

  • 231.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Customizing the computer screen photo-assisted techniqe for evaluating quick diagnostic tests2005In: Nordic Baltic Conference in Biomedical Engineering and Medical Physics,2005, 2005, p. 215-Conference paper (Refereed)
  • 232.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Distinctive photocurrent chemical images on bare SiO2 between continuous metal gates2003In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 95, no 1-3, p. 116-122Conference paper (Other academic)
    Abstract [en]

    Distinctive two-dimensional chemical images of hydrogen, ammonia and nitrogen dioxide have been obtained using a scanning light pulse technique (SLPT) on a metal-oxide-semiconductor (MOS) device. The sensor consists of an MOS capacitor with two continuous metal gates of Pd (40nm) and Au (50nm) arranged in a concurrent geometry, leaving a bare silicon dioxide region in between the biased gates. The present arrangement provides a new robust alternative to the existing strategies used to induce spatially distributed chemical responses, required for SLPT and allows to measure the response in a different place than where the biasing electrodes operate. Accordingly, the splitting of biasing and detection coordinates enables to optimize electrical and chemical functions separately providing a higher versatility in the choice of functional sensing materials or stable biasing electrodes. © 2003 Elsevier B.V. All rights reserved.

  • 233.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Effect of fingerprint conformation and spectral scaling on the performance of computer screen photo-assisted experiments2006In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 131, no 1, p. 118-125Article in journal (Refereed)
    Abstract [en]

    The use of computer screens as controlled light sources and web cameras as image detectors (the so-called computer screen photo-assisted technique, CSPT) is an ubiquitous alternative for the evaluation of colorimetric quick tests at homes or in primary care units. The performance of CSPT for such evaluations depends on several factors, from which the most relevant are the composition of illuminating sequences and the conformation of CSPT substance signatures. In this work, with the aid of a CSPT model, the effect of the construction of the substance signatures on the classification performance of different representative substance sets is studied. The correlation of illuminating colors with such classification is investigated, allowing one to determine redundancy and limitations with respect to visible spectroscopy. The concept of spectral scaling is introduced and its properties compared with standard procedures. © The Royal Society of Chemistry 2006.

  • 234.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Hydrogen detection on bare SiO2 between metal gates2002In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 91, no 6, p. 3896-3903Article in journal (Refereed)
    Abstract [en]

    Metal-oxide-semiconductor capacitors with gates of Pd and Au forming a wedge of bare SiO2 between them are described. It is observed that the sensitivity to H2 in the wedge is larger than on the outside of the metal gates due to the different distribution of potential determined by the geometrical constraints. The local response of the surface is obtained through the use of a scanning light pulse technique (SLPT), showing photocurrent versus voltage curves shifted to more negative voltages upon exposure to hydrogen. Within the wedge there is a two-dimensional photocurrent pattern composed of two splitting photocurrent peaks, whose separation depends on the distance between Au and Pd contacts, and on the composition of the ambient. The transient response in the wedge is comparable to that of Pd gates and the possibility of detecting hydrogen (or other molecules) by measuring on the bare insulator surface provides new possibilities for the use of field-effect structures for gas sensing. A semiempirical model describing the SLPT response for this particular geometry, conforms to experimental features, and highlights the sensitivity of the distribution of potential in the wedge to the density of charges induced on the semiconductor surface. © 2002 American Institute of Physics.

  • 235.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Illumination strategies for substance classification using a computer screen photo-assisted techique2005Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Poster Gordon Research Conference on Chemical Sensors and Interfacial Design 2005 Queens College, Oxford, UK

  • 236.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Measurement strategy and instrumental performance of a computer screen photo-assisted technique for the evaluation of a multi-parameter colorimetric test strip2006In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 131, no 1, p. 111-117Article in journal (Refereed)
    Abstract [en]

    A measuring strategy for the evaluation of a seven parameters colorimetric test using a computer screen photo-assisted technique (CSPT) is demonstrated. CSPT is a versatile approach aimed at point of care or home tests that uses regular computer sets and web cameras as the whole instrument. Issues such as the stability and the equivalency on different platforms of the determinations have been addressed in the present work. The method uses an embedded local reference simultaneously measured with the tests and solves the evaluation as a classification problem. The achieved performance tested along 580 classifications covering all the ranges of the assay, using synthetic samples, yielded 97.2% correct determinations compared with 89.7% for the case of colorimetric determinations. The errors were concentrated in only two parameters that show a significant correlation with a set of quality indices used to assess the performance of the classification. © The Royal Society of Chemistry 2006.

  • 237.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Measurements stategy and instrumental performance of a computer screen photo-assisted technique for the evaluation of a seven parameters colorimetric test2005Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Poster konferens Eurosenors XIX, Barcelona, Spanien

  • 238.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Preferential color substances and optimized illuminations for computer screen photo-assisted classification2006In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 5572006, p. 393-398Article in journal (Refereed)
  • 239.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Spectral characteristics of computer screen photoassisted classification2006In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 99, no 11Article in journal (Refereed)
    Abstract [en]

    The computer screen photoassisted technique (CSPT) is a practical method for the classification of colored or fluorescent substances such as those present in bioassays but using standard computer sets and regular web cameras as all instruments. It is empirically known that the performance of the CSPT classification depends on the composition of the illuminating sequences displayed by the computer screens during the measurements, and by the way that substance fingerprints from these measurements are composed. Here the illuminating conditions are examined with the help of a CSPT model that allows to examine the physical grounds of optimum illuminating sequences different from just three screen primaries and to assess the limitations and importance of longer illuminating sequences in practical determinations. © 2006 American Institute of Physics.

  • 240.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Spectroscopic information retained in screen photo-assisted techniques2004In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 521, no 2, p. 237-244Article in journal (Refereed)
    Abstract [en]

    The computer screen photo-assisted technique (CSPT), a recently reported method for characterization of colorimetric assays, has been modeled and the ability of the technique to retain key spectral features has been determined. The robustness of CSPT to operate with different kind of screens is demonstrated and a physical explanation of the result is provided. Simulated CSPT transmittances corroborate experimental results, and enable comparison with standard methods for qualitative and quantitative evaluation. © 2004 Elsevier B.V. All rights reserved.

  • 241.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Test method2005Patent (Other (popular science, discussion, etc.))
  • 242.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Alimelli, A.
    DiNatale, C.
    Paolese, R.
    DAmico, A.
    Disposable e-nose based on spectral fingerprinting using a computer screen photo assisted technique2006Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Konferensbidrag (muntligt) vid "11th International Conference on Chemical Sensors - IMCS11, Brescia, Italy, 16-19 july

  • 243.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Alimelli, A.
    DiNatale, C.
    Paolesse, R.
    DAmico, A.
    CSPT fingerprinting of molecular interaction with porphyrins2006Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Konferensbidrag (muntligt) vid "International Conference of Porphyrins and Phthalocyanines ICPP-4", Rome, Italy, 2-7 july 

  • 244.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Alimelli, A.
    Paolesse, R.
    DAmico, A.
    DiNatale, C.
    Development of chemical sensors based on computer screen photo-assisted technology2006In: 11th ISEM,2006, 2006Conference paper (Other academic)
  • 245.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Alimelli, A.
    Paolesse, R
    DAmico, A.
    DiNatale, C.
    Fish freshness identification by a computer screen photoassisted sensor array2006Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Poster vid konferensen "11th International Conference on Chemical Sensors - IMCS11, Brescia, Italy, 16-19 july

  • 246.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Mandoj, F.
    Nardis, S.
    Verrelli, G.
    Paolesse, R.
    Alimelli, A.
    DiNatale, C.
    DAmico, A.
    Micozzi, A.
    Zinc-porphyrin conjugated polymer: a novel and versatile sensing material2006Other (Other (popular science, discussion, etc.))
  • 247.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Pennazza, G.
    Santonico, M.
    diNatale, C.
    Paolesse, R.
    Bellincontro, A.
    Mencarelli, F.
    DAmico, A.
    Sorting of apricots with computer screen photoassisted spectral reflectance analysis and electronic nose2006In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 119, no 1, p. 70-77Article in journal (Refereed)
    Abstract [en]

    Optical properties and aroma have been indicated as sources of information for the analysis of quality of fruits. Optical properties can be measured with several experimental arrangements and equipments that are often complex with result difficult to interpret. In recent years, a number of suggestions arose in the sensor community proposing the use of conventional computer peripheral devices as analytical instruments. Among them the combination of a computer screen and a webcam was demonstrated to be suitable to measure optical properties of materials. In this paper this arrangement is utilized to characterize the reflectance of apricot fruits that underwent different post-harvest treatment and mechanical damages. Optical measurements were complemented by aroma analysis with an electronic nose. The response of fruits to treatments was also monitored measuring CO2 (indicator of respiration) and ethylene (indicator of ripening), both these parameters are known to be influenced by post-harvest treatment and mechanical damages. Results show that a computer screen-webcam combination and an electronic nose are both sensitive to mechanical damages of fruits devising their use, after due optimization, for routine fruit sorting. © 2005.

  • 248.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Uchida, H.
    Faculty of Engineering, Saitama University, 255 Shimo-Okubo, Urawa 338, Japan.
    Gap-gate field effect gas sensing device for chemical image generation2004In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 84, no 15, p. 2946-2948Article in journal (Refereed)
    Abstract [en]

    A field effect chemically sensing device, suited for the generation of scanning light pulse technique (SLPT) chemical images, was proposed. The device was a MOS capacitor made on p-Si (10 ?), thermally oxidized to 120 nm and metallized on its underside with 200 nm of Al. The biasing electrodes were two parallel Al tracks 100 nm thick spaced 1 mm from each other. The results demonstrate the complete separation between biasing and sensing functions in devices designed for SLPT chemical image generation.

  • 249.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Manzano, J
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    LCD-aided computer screen photo-assisted technique for colorimetric assays evaluation2004In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 103, no 01-Feb, p. 158-164Article in journal (Refereed)
    Abstract [en]

    The ability of the computer screen photo-assisted technique (CSPT) to evaluate color samples through its light transmittance profiles is demonstrated by using liquid crystal displays (LCD) as light sources. Transmittance profiles are more drastically affected by angular dependencies than those obtained with CRT illumination. A local light reference computation is introduced to counteract this effect yielding equivalent profiles for both kinds of displays thus allowing for a broader universe of platforms to perform CSPT experiments, including mobile devices. (C) 2004 Elsevier B.V. All rights reserved.

  • 250.
    Filippini, Daniel
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Suska, Anke
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Customized illumination strategies in computer screen photo-assisted experiments2005Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Poster Konferens Eurosensors XIX, Barcelona, Spanien

2345678 201 - 250 of 655
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