肽类消化吸收方式与机制研究进展

最新研究表明,寡肽可以被小肠直接吸收,但其吸收方式是与氨基酸不同的、相互独立的转运机制。寡肽的特殊载体,通过氢离子和钙离子浓度电导的消耗能量的主动转运系统、具pH依赖性的非耗能性钠离子和氢离子交换系统和谷胱甘肽（GSH）等三种系统进行转运。食物蛋白质的品质、肽链长度与肽的氨基酸组成、生理状况等因素都会影响寡肽的消化吸收。     

丝肽预处理对棉织物天然染料染色性能的影响

以柞蚕落绵为原料制备丝肽,并对其进行红外及紫外光谱分析.采用该丝肽整理棉织物,然后用艾蒿、苏木、红茶3种天然染料对整理前后的棉织物进行染色,探讨丝肽整理对棉织物天然染料染色性能的影响.结果表明:经丝肽整理后,棉织物采用3种天然染料染色的K/S值均有不同程度的提高,摩擦牢度和皂洗牢度略有下降,其中红茶Cu2+媒染样品的K/S值提高最显著,为整理前的2.24倍,其皂洗和摩擦牢度均达到3级以上.棉织物经丝肽整理后,断裂强力稍有下降,白度基本保持不变,柔软度有所改善.     

新型就仓干燥技术处理高水分玉米种子的实仓应用效果分析

应用低温缓速均匀通风基本原理设计的设备系统,对堆高2 m的58 t散装高水分玉米种子(籽粒,入仓平均水分20.2%)进行就仓干燥处理.经过累计301.5 h的间断式处理,按预定降水目标12.5%,结果以40多个固定和临时取样点的跟踪检测,实际降低到平均12.4%(最高12.9%,最低11.7%);对水分检测结果的离散性分析表明,在无霉变、无损伤、无抛洒、不影响种子活性的前提下,能够达到精确控制调节粮食水分的要求.     

纸质基材抗菌包装及性能研究

以纳米银为抗菌剂、聚乙烯醇为黏结剂处理普通成纸,制备了包装用抗菌纸。采用抑菌圈法评价了该抗菌纸对大肠杆菌的抑制效果,研究了聚乙烯醇和纳米银的含量对抗菌纸抗菌性能、抗张强度和伸长率的影响。结果表明:抗菌纸的抗张强度及伸长率均能满足包装需求,且具有良好的抗菌性能,其抗菌效果随纳米银和聚乙烯醇含量的增加而增强。     

Biodiesel development from high acid value polanga seed oil and performance evaluation in a CI engine

Non-edible filtered high viscous (72 cSt at 40 °C) and high acid value (44 mg KOH/gm) polanga (Calophyllum inophyllum L.) oil based mono esters (biodiesel) produced by triple stage transesterification process and blended with high speed diesel (HSD) were tested for their use as a substitute fuel of diesel in a single cylinder diesel engine. HSD and polanga oil methyl ester (POME) fuel blends (20%, 40%, 60%, 80%, and 100%) were used for conducting the short-term engine performance tests at varying loads (0%, 20%, 40%, 60%, 80%, and 100%). Tests were carried out over entire range of engine operation at varying conditions of speed and load. The brake specific fuel consumption (BSFC) and brake thermal efficiency (BTE) were calculated from the recorded data. The engine performance parameters such as fuel consumption, thermal efficiency, exhaust gas temperature and exhaust emissions (CO, CO₂, HC, NO_x, and O₂) were recorded. The optimum engine operating condition based on lower brake specific fuel consumption and higher brake thermal efficiency was observed at 100% load for neat biodiesel. From emission point of view the neat POME was found to be the best fuel as it showed lesser exhaust emission as compared to HSD.     

Chinese melon (Momordica charantia L.) seed: Composition and potential use

Chinese melon (Momordica charantia L.), also known as bitter gourd, is a tropical crop, grown throughout Asian countries for use as food and medicinals. In 1993, four cultivars of Chinese melon were grown in Mississippi and the seeds were collected. Oil contents of the seeds ranged from 41 to 45% and the oils contained 63–68% eleostearic acid and 22–27% stearic acid. Industrially important tung oil, a “fast-drying oil” used in paints and varnishes, contains 90% eleostearic and 2–3% stearic acid. The ratio of stearic to eleostearic in Chinese melon seed oil is ten times greater than that in tung oil. The higher ratio should reduce the rate of drying and crosslinking and could be advantageous in the paint industry. The defatted meals contained 52–61% protein and would be a good source of methionine.     

基于计数排序的最小种子集贪心算法

网络最小种子集问题与网络影响最大化问题相关,研究的是对于具有节点阈值的网络,构造网络的最小节点子集,使得如果这个子集中的节点是活的,则在给定的影响传播模型下整个网络都受到影响。为此提出了新的贪心算法,以节点的度与阈值的差为关键值对网络节点进行计数排序,然后取值最小的节点进行处理。新算法在时间复杂度上改进了基于最小堆的种子点选取算法。在简单多数阈值模型上针对经典的无标度网络得到了所构造的种子集规模上界。实验在随机生成网络和一些实际网络数据集上进行,结果表明所提方法的有效性,特别在无标度网络上生成的种子集具有比相关算法更小的规模。     

Chemical synthesis of {gamma}-echistatin analogues: elucidation of status of C-terminal (45-49)

Three analogues of -echistatin, des(45–49)--echistatin,des(46–49)-y-echistatin and des(47–49)--echistatin,were synthesized by solid-phase methodology and their biologicalactivities were measured and compared. The results reveal thatwithout the C-terminal (45–49) of -echistatin, the foldingof the protein to the final active structure is not interferedwith and Lys-45 influences the inhibition of platelet aggregation.     

基于表示学习和深度森林的长链非编码RNA编码短肽预测模型

长链非编码RNA（lncRNA）中的小开放阅读框（sORFs）能够编码长度不超过100个氨基酸的短肽。针对短肽预测研究中lncRNA中的sORFs特征不鲜明且高可信度数据尚不充分的问题,提出一种基于表示学习的深度森林（DF）模型。首先,使用常规lncRNA特征提取方法对sORFs进行编码;其次,通过自编码器（AE）进行表示学习来获得输入数据的高效表示;最后,训练DF模型实现对lncRNA编码短肽的预测。实验结果表明,该模型在拟南芥数据集上能够达到92.08%的准确率,高于传统机器学习模型、深度学习模型以及组合模型,且具有较好的稳定性;此外,在大豆与玉米数据集上进行的模型测试中,该模型的准确率分别能达到78.16%和74.92%,验证了所提模型良好的泛化能力。     

一种靶向蛋白质超声微泡的制备及表征

以氟碳气体为超声造影剂,通过接枝纳米磁性颗粒-RGD多肽,构建靶向蛋白质超声微泡,制备一种可同时用于超声造影和磁共振成像(MRI)的双模态造影增强剂。通过显微镜对磁性蛋白超声微泡形貌进行观察,利用红外光谱、分光光度法分析纳米磁性颗粒接枝牛血清蛋白的接枝率,并通过细胞实验评价磁性蛋白微泡的生物相容性。