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  • 1.
    Guerrero-Barajas, Claudia
    et al.
    Inst Politecn Nacl, Mexico.
    Constantino-Salinas, Erick A.
    Inst Politecn Nacl, Mexico.
    Amora-Lazcano, Enriqueta
    Inst Politecn Nacl, Mexico.
    Tlalapango-Angeles, Daniel
    Inst Politecn Nacl, Mexico.
    Mendoza Figueroa, Silvestre
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering. Inst Politecn Nacl, Mexico.
    Cruz-Maya, Juan A.
    Inst Politecn Nacl, Mexico.
    Jan-Roblero, Janet
    Inst Politecn Nacl, Mexico.
    Bacillus mycoides A1 and Bacillus tequilensis A3 inhibit the growth of a member of the phytopathogen Colletotrichum gloeosporioides species complex in avocado2020In: Journal of the Science of Food and Agriculture, ISSN 0022-5142, E-ISSN 1097-0010, Vol. 100, p. 4049-4056Article in journal (Refereed)
    Abstract [en]

    BACKGROUND Avocado is affected by Colletotrichum gloeosporioides causing anthracnose. Antagonistic microorganisms against C. gloeosporioides represent an alternative for biological control. Accordingly, in the present study, we focused on the isolation and characterization of potential antagonist bacteria against a member of the C. gloeosporioides species complex with respect to their possible future application. RESULTS Samples of avocado rhizospheric soil were aquired from an orchard located in Ocuituco, Morelos, Mexico, aiming to obtain bacterial isolates with potential antifungal activity. From the soil samples, 136 bacteria were isolated and they were then challenged against a member of the C. gloeosporioides species complex; only three bacterial isolates A1, A2 and A3 significantly diminished mycelial fungal growth by 75%, 70% and 60%, respectively. Two of these isolates were identified by 16S rRNA as Bacillus mycoides (A1 and A2) and the third was identified as Bacillus tequilensis (A3). Bacillus mycoides bacterial cell-free supernatant reduced the mycelial growth of a member of the C. gloeosporioides species complex isolated from avocado by 65%, whereas Bacillus tequilensis A3 supernatant did so by 25% after 3 days post inoculation. Bacillus tequilensis mycoides A1 was a producer of proteases, indolacetic acid and siderophores. Preventive treatment using a cell-free supernatant of B. mycoides A1 diminished the severity of anthracnose disease (41.9%) on avocado fruit. CONCLUSION These results reveal the possibility of using B. mycoides A1 as a potential biological control agent. (c) 2020 Society of Chemical Industry

  • 2.
    Ji, Fuxiang
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Klarbring, Johan
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    Wang, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Ning, Weihua
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Wang, Linqin
    KTH Royal Inst Technol, Sweden.
    Yin, Chunyang
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Mendoza Figueroa, José Silvestre
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Christensen, Christian Kolle
    DESY, Germany.
    Etter, Martin
    DESY, Germany.
    Ederth, Thomas
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Sun, Licheng
    KTH Royal Inst Technol, Sweden; Dalian Univ Technol, Peoples R China.
    Simak, Sergey
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    Abrikosov, Igor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Natl Univ Sci and Technol MISIS, Russia.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Lead-Free Halide Double Perovskite Cs2AgBiBr6with Decreased Band Gap2020In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 59, no 35, p. 15191-15194Article in journal (Refereed)
    Abstract [en]

    Environmentally friendly halide double perovskites with improved stability are regarded as a promising alternative to lead halide perovskites. The benchmark double perovskite, Cs2AgBiBr6, shows attractive optical and electronic features, making it promising for high-efficiency optoelectronic devices. However, the large band gap limits its further applications, especially for photovoltaics. Herein, we develop a novel crystal-engineering strategy to significantly decrease the band gap by approximately 0.26 eV, reaching the smallest reported band gap of 1.72 eV for Cs(2)AgBiBr(6)under ambient conditions. The band-gap narrowing is confirmed by both absorption and photoluminescence measurements. Our first-principles calculations indicate that enhanced Ag-Bi disorder has a large impact on the band structure and decreases the band gap, providing a possible explanation of the observed band-gap narrowing effect. This work provides new insights for achieving lead-free double perovskites with suitable band gaps for optoelectronic applications.

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  • 3.
    Vazquez-Sanchez, Ernesto A.
    et al.
    Inst Politecn Nacl IPN, Mexico; Escuela Nacl Med and Homeopatia ENMyH IPN, Mexico.
    Mendoza Figueroa, Silvestre
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Gutierrez-Gonzalez, Guadalupe
    Inst Politecn Nacl IPN, Mexico.
    Zapi-Colin, Luis A.
    Inst Politecn Nacl IPN, Mexico.
    Torales-Cardena, Azael
    Escuela Nacl Med and Homeopatia ENMyH IPN, Mexico.
    Briseno-Lugo, Paola E.
    Univ Nacl Autonoma Mexico, Mexico.
    Diaz-toala, Ivan
    Escuela Super Comp IPN, Mexico.
    Cancino-Diaz, Juan C.
    ENCB IPN, Mexico.
    Perez-Tapia, Sonia M.
    ENCB IPN, Mexico.
    Cancino-Diaz, Mario E.
    Inst Politecn Nacl IPN, Mexico.
    Gomez-Chavez, Fernando
    Escuela Nacl Med and Homeopatia ENMyH IPN, Mexico; Inst Nacl Pediat, Mexico.
    Rodriguez-Martinez, Sandra
    Inst Politecn Nacl IPN, Mexico.
    Heptapeptide HP3 acts as a potent inhibitor of experimental imiquimod-induced murine psoriasis and impedes the trans-endothelial migration of mononuclear cells2020In: Molecular Medicine Reports, ISSN 1791-2997, E-ISSN 1791-3004, Vol. 22, no 1, p. 507-515Article in journal (Refereed)
    Abstract [en]

    During the progression of psoriatic lesions, abundant cellular infiltration of myeloid cells, such as macrophages and activated dendritic cells, occurs in the skin and the infiltrating cells interact with naive lymphoid cells to generate a T helper (Th)1 and Th17 environment. Therapies to treat psoriasis include phototherapy, non-steroidal and steroidal drugs, as well as antibodies to block tumor necrosis factor-alpha, interleukin (IL)-17-A and IL-12/IL-23, which all focus on decreasing the proinflammatory hallmark of psoriasis. The present study obtained the heptapeptide HP3 derived from phage display technology that blocks mononuclear cell adhesion to endothelial cells and inhibits trans-endothelial migrationin vitro. The activity of the heptapeptide in a murine model of psoriasis was also assessed, which indicated that early administration inhibited the development of psoriatic lesions. Therefore, the results suggested that HP3 may serve as a potential therapeutic target for psoriasis.

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  • 4.
    Xu, Kai
    et al.
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. Yanshan Univ, Peoples R China.
    Ruoko, Tero-Petri
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. Tampere Univ, Finland.
    Shokrani, Morteza
    Heidelberg Univ, Germany.
    Scheunemann, Dorothea
    Heidelberg Univ, Germany.
    Abdalla, Hassan
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Sun, Hengda
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. Donghua Univ, Peoples R China.
    Yang, Chiyuan
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Puttisong, Yuttapoom
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Kolhe, Nagesh B.
    Univ Washington, WA 98195 USA; Univ Washington, WA 98195 USA.
    Mendoza Figueroa, Silvestre
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Oshaug Pedersen, Jonas
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Ederth, Thomas
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering. Linköping University, Faculty of Science & Engineering.
    Chen, Weimin
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Berggren, Magnus
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. N Ink AB, Teknikringen 7, SE-58330 Linkoping, Sweden.
    Jenekhe, Samson A.
    Univ Washington, WA 98195 USA; Univ Washington, WA 98195 USA.
    Fazzi, Daniele
    Univ Bologna, Italy; Univ Cologne, Germany.
    Kemerink, Martijn
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Heidelberg Univ, Germany.
    Fabiano, Simone
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. N Ink AB, Teknikringen 7, SE-58330 Linkoping, Sweden.
    On the Origin of Seebeck Coefficient Inversion in Highly Doped Conducting Polymers2022In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 32, no 20, article id 2112276Article in journal (Refereed)
    Abstract [en]

    A common way of determining the majority charge carriers of pristine and doped semiconducting polymers is to measure the sign of the Seebeck coefficient. However, a polarity change of the Seebeck coefficient has recently been observed to occur in highly doped polymers. Here, it is shown that the Seebeck coefficient inversion is the result of the density of states filling and opening of a hard Coulomb gap around the Fermi energy at high doping levels. Electrochemical n-doping is used to induce high carrier density (>1 charge/monomer) in the model system poly(benzimidazobenzophenanthroline) (BBL). By combining conductivity and Seebeck coefficient measurements with in situ electron paramagnetic resonance, UV-vis-NIR, Raman spectroelectrochemistry, density functional theory calculations, and kinetic Monte Carlo simulations, the formation of multiply charged species and the opening of a hard Coulomb gap in the density of states, which is responsible for the Seebeck coefficient inversion and drop in electrical conductivity, are uncovered. The findings provide a simple picture that clarifies the roles of energetic disorder and Coulomb interactions in highly doped polymers and have implications for the molecular design of next-generation conjugated polymers.

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1 - 4 of 4
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