用葡萄球菌甲蛋白协同凝集鉴别猪痢疾密螺旋体的研究

应用猪痢疾蜜螺旋体（Ｔ．Ｈ．）免疫血清结合葡萄球菌甲蛋白（ＳＰＡ）与Ｈ１０，２－５，Ｘ２３，Ｃ１７等Ｔ．Ｈ．菌株进行协同凝集试验，均出现明显凝集反应。而免疫血清结合不含ＳＰＡ的菌株，无特定病原（ＳＰＦ）血清结合含ＳＰＡ的菌株均无凝集反应。免疫血清结合ＳＰＡ与７种肠道菌均无凝集反应。免疫血清用量以０．２ｍｌ为合适。最低用菌量为３０倍稀释，即每个视野Ｔ．Ｈ．约４０个菌体。     

Isomalabaricane Triterpenes from the Marine Sponge Rhabdastrella sp.

The marine sponge of the genus Geodia, Jaspis, Rhabdastrella, and Stelletta are characterized chemically by a variety of isomalabaricane triterpenes. This class of compounds drew spotlights in marine lead discovery due to their profound anti-proliferative properties. Further research on exploring its chemical diversity led to the identifications of two new isomalabaricane-type triterpenes rhabdastin H (1) and rhabdastin I (2). Their structures were unraveled using a series of spectroscopic approaches. These isolates were found to exhibit unique structural features with the only reported tetrahydrofuran functionality among all marine-derived isomalabaricanes. Both compounds 1 and 2 showed activities against K562 (IC₅₀ 11.7 and 9.8 μM) and Molt4 (IC₅₀ 16.5 and 11.0 μM) leukemic cells in MTT cell proliferative assay.     

中国蔬菜协会种苗分会成立 助力种苗产业发展

<正>为了促进蔬菜种苗产业规范、有序、健康发展,增进种苗产业内部的沟通协作,中国蔬菜协会成立种苗分会,并于2015年1月19日在山东省寿光市召开成立大会。农业部种植业管理司、全国农业技术推广服务中心、中国蔬菜协会、中国园艺学会有关领导出席会议并讲话,来自全国各地的120个单位、260位代表参加了大会。大会由中国蔬菜协会秘书长柴立平主持,选举产生了中国蔬菜协会     

The Shortcoming and Improvement of the Project Break-Even Analysis Method

This paper points out the shortcoming of the existing project break-even analysis method. A new improved method-the dynamic project break-even analysis method has been put forward.     

板材多点成形工艺及装备

多点成形法是针对多品种、小批量的三维曲面板材成形的一种柔性加工法。采用这种方法可替代传统的模具,从而节省模具制造费用。本文介绍了有关这一加工方法的基本原理并在自制的简单多点试验机上进行了一系列试验,对4种不同的多点成形法的成形效果进行了讨论。     

微灌系统均匀度的保证率分析

本文将可靠性理论引入微灌系统灌水质量的评价中。因为微灌灌水均匀度或出流均匀度作为评价灌水质量的指标,它受许多具有不确定性因素的影响,文中分析了这些不确定因素在一定的概率分布条件下微灌单元灌水均匀度的保证率或可靠度。在文献的基础上分析了在一定坡度下,微灌系统均匀度的保证率计算。     

The Microstructure,Antibacterial and Antitumor Activities of Chitosan Oligosaccharides and Derivatives

Chitosan obtained from abundant marine resources has been proven to have a variety of biological activities. However, due to its poor water solubility, chitosan application is limited, and the degradation products of chitosan oligosaccharides are better than chitosan regarding performance. Chitosan oligosaccharides have two kinds of active groups, amino and hydroxyl groups, which can form a variety of derivatives, and the properties of these derivatives can be further improved. In this review, the key structures of chitosan oligosaccharides and recent studies on chitosan oligosaccharide derivatives, including their synthesis methods, are described. Finally, the antimicrobial and antitumor applications of chitosan oligosaccharides and their derivatives are discussed.     

Potential of Plant Proteins Digested In Silico by Gastrointestinal Enzymes as Nutritional Supplement for COVID-19 Patients

Plant Foods for Human Nutrition - Currently, no specific drug and vaccine are available for the new coronavirus SARS-CoV-2, and nutritional supplementation should be helpful. This study tried to...     

Analysis of the water balance and the nitrogen and phosphorus runoff pollution of a paddy field in situ in the Taihu Lake basin

Paddy and Water Environment - Nitrogen (N) and phosphorus (P) runoff loads of paddy fields in situ under conventional water and fertilizer management measures caused severe water pollution in the...