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- 저자 : Brunetta, Carl D. (검색결과 2 건)
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Rosmus, Kimberly A.,Brant, Jacilynn A.,Wisneski, Stephen D.,Clark, Daniel J.,Kim, Yong Soo,Jang, Joon I.,Brunetta, Carl D.,Zhang, Jian-Han,Srnec, Matthew N.,Aitken, Jennifer A. American Chemical Society 2014 Inorganic Chemistry Vol.53 No.15
<P>Cu<SUB>2</SUB>CdSnS<SUB>4</SUB> and α/β-Cu<SUB>2</SUB>ZnSiS<SUB>4</SUB> meet several criteria for promising nonlinear optical materials for use in the infrared (IR) region. Both are air-stable, crystallize in noncentrosymmetric space groups, and possess high thermal stabilities. Cu<SUB>2</SUB>CdSnS<SUB>4</SUB> and α/β-Cu<SUB>2</SUB>ZnSiS<SUB>4</SUB> display wide ranges of optical transparency, 1.4–25 and 0.7–25 μm, respectively, and have relatively large second-order nonlinearity as well as phase matchability for wide regions in the IR. The laser-damage threshold (LDT) for Cu<SUB>2</SUB>CdSnS<SUB>4</SUB> is 0.2 GW/cm<SUP>2</SUP>, whereas α/β-Cu<SUB>2</SUB>ZnSiS<SUB>4</SUB> has a LDT of 2.0 GW/cm<SUP>2</SUP> for picosecond near-IR excitation. Both compounds also exhibit efficient third-order nonlinearity. Electronic structure calculations provide insight into the variation in properties.</P><P>Changing Sn<SUP>4+</SUP> to Si<SUP>4+</SUP> in the I<SUB>2</SUB>−II−IV−VI<SUB>4</SUB> formula has significant effects on the characteristics critical for nonlinear optical applications. The air-stable, noncentrosymmetric, diamond-like Cu<SUB>2</SUB>CdSnS<SUB>4</SUB> and α/β-Cu<SUB>2</SUB>ZnSiS<SUB>4</SUB> exhibit significant second- and third-order nonlinearity. These materials are practical for applications because of their elevated thermal stabilities, wide optical transparency windows, broad regions of phase matchability for second harmonic generation, and high laser-damage thresholds (LDTs). The LDT of the wide-gap α/β-Cu<SUB>2</SUB>ZnSiS<SUB>4</SUB> surpasses that of commercially available materials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2014/inocaj.2014.53.issue-15/ic501310d/production/images/medium/ic-2014-01310d_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic501310d'>ACS Electronic Supporting Info</A></P>
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Grossi-De-Sa, Maria Fatima,De Magalhaes, Mariana Quezado,Silva, Marilia Santos,Silva, Shirley Margareth.Buffon,Dias, Simoni Campos,Nakasu, Erich Yukio Tempel,Brunetta, Patricia Sanglard Felipe,Oliveir Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.5
Different isolates of the soil bacterium Bacillus thuringiensis produce multiple crystal (Cry) proteins toxic to a variety of insects, nematodes and protozoans. These insecticidal Cry toxins are known to be active against specific insect orders, being harmless to mammals, birds, amphibians, and reptiles. Due to these characteristics, genes encoding several Cry toxins have been engineered in order to be expressed by a variety of crop plants to control insectpests. The cotton boll weevil, Anthonomus grandis, and the fall armyworm, Spodoptera frugiperda, are the major economically devastating pests of cotton crop in Brazil, causing severe losses, mainly due to their endophytic habit, which results in damages to the cotton boll and floral bud structures. A cry1Ia-type gene, designated cry1Ia12, was isolated and cloned from the Bt S811 strain. Nucleotide sequencing of the cry1Ia12 gene revealed an open reading frame of 2160 bp, encoding a protein of 719 amino acid residues in length, with a predicted molecular mass of 81 kDa. The amino acid sequence of Cry1Ia12 is 99% identical to the known Cry1Ia proteins and differs from them only in one or two amino acid residues positioned along the three domains involved in the insecticidal activity of the toxin. The recombinant Cry1Ia12 protein, corresponding to the cry1Ia12 gene expressed in Escherichia coli cells, showed moderate toxicity towards first instar larvae of both cotton boll weevil and fall armyworm. The highest concentration of the recombinant Cry1Ia12 tested to achieve the maximum toxicities against cotton boll weevil larvae and fall armyworm larvae were 230 ${\mu}g/mL$ and 5 ${\mu}g/mL$, respectively. The herein demonstrated insecticidal activity of the recombinant Cry1Ia12 toxin against cotton boll weevil and fall armyworm larvae opens promising perspectives for the genetic engineering of cotton crop resistant to both these devastating pests in Brazil.
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