Combinatorial Screening of Polymer:Fullerene Blends for Organic Solar Cells by Inkjet Printing

Polymer:fullerene blends were screened in a combinatorial approach using inkjet printing thin film libraries for photovoltaic devices. The application of inkjet printing enabled a fast and simple experimental workflow from film preparation to the study of structure‐property‐relationships with a very high material efficiency. Inkjet printing requires less material for the preparation of thin film libraries in comparison to other dispensing techniques, like spin‐coating. Two polymers (PCPDTBT, PSBTBT) and two fullerene derivatives (mono‐PCBM, bis‐PCBM) were investigated in various blend ratios, concentrations, solvent ratios, and film thicknesses. Morphological and optical properties of the inkjet printed films were investigated and compared with spin‐coated films. This study shows the principle of an experimental setup from solution preparation to film characterization for the combinatorial investigation of large polymer:fullerene libraries.     

肖黄栌红色素的理化性质研究

本文研究了肖黄栌红色素的提取 ,并研究了不同糖浓度、温度、光照、紫外线、Na2 HPO4 -KH2 PO4 缓冲液、维生素C、氧化剂H2 O2 、还原剂Na2 SO3 等对肖黄栌红色素稳定性的影响。结果表明 ,肖黄栌红色素适应的pH范围较广、抗热、抗氧化、抗还原、耐糖、耐维生素C。因而是一种有重要开发价值的天然红色素     

Elucidating protein secondary structures using alpha-carbon recurrence quantifications.

Secondary structures of proteins were studied by recurrence quantification analysis (RQA). High-resolution, 3-dimensional coordinates of alpha-carbon atoms comprising a set of 68 proteins were downloaded from the Protein Data Bank. By fine-tuning four recurrence parameters (radius, line, residue, separation), it was possible to establish excellent agreement between percent contribution of alpha-helix and beta-sheet structures determined independently by RQA and that of the DSSP algorithm (Define Secondary Structure of Proteins). These results indicate that there is an equivalency between these two techniques, which are based upon totally different pattern recognition strategies. RQA enhances qualitative contact maps by quantifying the arrangements of recurrent points of alpha carbons close in 3-dimensional space. For example, the radius was systematically increased, moving the analysis beyond local alpha-carbon neighborhoods in order to capture super-secondary and tertiary structures. However, differences between proteins could only be detected within distances up to about 6-11 A, but not higher. This result underscores the complexity of alpha-carbon spacing when super-secondary structures appear at larger distances. Finally, RQA-defined secondary structures were found to be robust against random displacement of alpha carbons upwards of 1 A. This finding has potential import for the dynamic functions of proteins in motion.     

沸石对土壤养分生物有效性和土壤化学性质的影响研究

在花岗岩发育的赤红壤上进行的天然沸石混施化肥的盆栽试验研究结果表明,沸石提高了土壤养分的生物有效性,显著促进玉米的生长,增加玉米的生物量和提高了玉米对N,P,K的吸收量,15N示踪技术表明,沸石处理可以显著提高氮肥的利用率,两造玉米最高的氮肥利用率分别比对照提高28．8％和60．0％,土壤的分析结果表明,沸石处理也可提高土壤阳离子交换量,盐基饱和度和土壤pH值。     

超大穗小麦籽粒灌浆特性研究

超大穗小麦是小麦超高产育种的宝贵资源,通过去穗处理,对不同类型的超大穗小麦灌浆特性进行了方程拟合及参数分析,结果表明：①百粒重的增重进程,在不同处理间无显著差异,不同品系间差异明显;②单株粒重的增重进程,在不同处理间、不同品系间都表现出显著差异,不同处理间更为突出;③对灌浆参数分析,超大穗小麦的最大灌浆速度与对照基本一致,但灌浆期显著的长,８６（３０６）达５０d,90(151)43d,而对照小偃６号、咸农１５１分别为４０d,35d。依次配合相应的栽培技术,可有效的发挥超大穗小麦产量潜力。     

贵州施秉喀斯特世界自然遗产提名地苔藓植物区系特征

由于地理环境优越、海拔跨度大、生境异质性高、人为影响小等原因,贵州施秉喀斯特世界自然遗产提名地的苔藓植物丰富,共有50科128属286种（含变种和亚种）,其中苔类17科23属43种,藓类33科105属243种。其优势科、属均反映了该区系的温带向热带过渡的性质。区系地理成分分析结果显示,该区苔藓植物北方温带成分、热带成分和东亚成分分别占37．12％、31．82％和30．30％,其中中国特有分布型占12．12％,反映了施秉喀斯特苔藓植物区系具有温热并重、东亚色彩浓厚、特有性较高的特征。通过对施秉喀斯特与其它五个区域的苔藓区系进行对比发现．施秉苔藓区系丰富度高,与同为云贵区的香纸沟、马岭河、罗平喀斯特地区亲缘关系最近。     

Influence of most reactive inorganic cation in the optical and biological activities of L-Lysine monohydrochloride crystal

Slow evaporation method was used to grow the pure and K⁺ ion doped L-Lysine monohydrochloride (L-LMHCL) crystals which has optical and antibiotic applications. The space group, structure and slight shifting of peaks are confirmed using single crystal XRD and the powder XRD. The FTIR analysis also shows that the K⁺ doped L-LMHCL has a slight shifting in the spectrum which indicates the functional group of L-LMHCL and the interaction between the K⁺ ions. The existence of K⁺ ion in the doped crystal is assured by the presence of potassium in the EDAX spectrum. The wide optical band gap was found for pure and K⁺ doped crystal using UV spectra and these are utilized in optoelectronic and nonlinear applications. The Kurtz Perry technique specified the NLO property of grown crystals. The dielectric property crystals was studied by varying the temperature. As a result, the highest dielectric constant is observed in doped crystal. An antibacterial activity against certain bacteria like E-coli, pseudomonas aeruginosa and staphylococcus aureus are provided by mm range for the grown crystals.     

Characterization and antioxidant activity of an exopolysaccharide produced by Leuconostoc pseudomesenteroides JF17 from juçara fruits (Euterpe edulis Martius)

Juçara palm tree is considered an important species in the Atlantic forest ecosystem and the exploitation of its fruits is a main sustainable strategy adopted to its maintenance. Among several microorganisms in the juçara fruits, were found lactic acid bacteria (LAB) highly capable of synthesizing exopolysaccharides (EPS). Thus, the EPS synthesized by Leuconostoc pseudomesenteroides JF17 was characterized according to its chemical structure, physicochemical properties and antioxidant activity. HPLC analysis showed that the EPS consisted of a homopolysaccharide composed of glucose units, FT-IR spectroscopy revealed a dextran, confirmed by ¹H and ¹³C NMR spectra which showed the composition of the polysaccharide, d-glucose units bound by α-(1→6). The EPS showed high water retention capacity, 507.812 ± 47.471 %, and may be related to the porous structure revealed by SEM images. Thermal analysis indicated that the EPS had excellent thermal stability with degradation temperature of 320.8 °C and melting point at 279.81 °C, with the enthalpy of 106.557 J/g. The EPS also presented sequestration ability on different free radicals tested, indicating high antioxidant activity. The results suggest that L. pseudomesenteroides JF17 might be widely used in the production of dextran which has potential qualities for applications in the food industry.     

组织工程用纤维增强天然多糖水凝胶的进展

天然多糖水凝胶具有良好的生物相容性,然而其力学性能调节幅度小,无法满足组织工程应用巨大的需求。通过纤维增强法,不仅可显著提高天然多糖水凝胶的力学性能,还能调节复合水凝胶的降解性能、促进细胞粘附、增殖与分化行为及其组织沉积。常用的天然多糖组织工程水凝胶的纤维增强方法有物理共混法、化学作用法、静电驱动法与自组装法等。本文综述了纤维增强水凝胶的结构与功能特点,讨论了纤维增强对组织工程水凝胶的意义,以期对纤维增强组织工程水凝胶的发展起到促进作用。