营养盐和光照对浮游植物群落结构的影响

2006年4月在沙埕港湾口处网箱养殖区,研究营养盐和光照对浮游植物类群及其优势种生长的影响。结果表明,微、小型浮游植物在100%自然光强下生长最快,微微型浮游植物在50%自然光强下生长最快。在各形态无机氮（N）、磷（P）营养盐存在的情况下,浮游植物会首先利用氨氮（NH4-N）,但培养后期NH4-N加富组的浮游植物丰度低于亚硝酸盐（NO2-N）加富组和硝酸盐（NO3-N）加富组。营养盐加富在短期内引起浮游植物数量的快速增加,当营养盐浓度达到一定水平后对浮游植物的生长不利,其抑制作用随浮游植物种类而异;随着营养盐消耗,浮游植物的数量和多样性均下降。微、小型浮游植物丰度与NO3-N、N/P呈显著相关,相关系数分别为-0.625、0.521;微微型浮游植物丰度与磷酸盐（PO4-P）呈显著相关,相关系数为0.530。     

光谱光照调控组合性光源激发蝗虫趋光效果试验

针对蝗虫趋光选择性、蝗虫趋光辨识敏感性、频闪交变光照对蝗虫趋光增益特点,利用所研制的阵列条纹调控光照光源,对比优选了蝗虫趋光良好的光谱光照调控组合模式,进行了蝗虫趋光诱导试验,探讨了蝗虫趋光效应激发的机理。结果表明：阵列条纹光谱光照调控组合具有强化蝗虫趋光视觉增益、调控蝗虫趋光视动增效、激发蝗虫趋光聚集效应、削弱蝗虫趋光惰性的功效;蝗虫趋光响应激发效果由阵列条纹光谱光照能量及其调控光照组合方式决定;蝗虫对发光间隔为30ms的阵列频闪紫光与发光周期为640ms的竖条纹交变绿紫蓝光组合光照的趋光响应相对最优。调控光照光源激发饲养棚内蝗虫趋光效果结果表明:20：00~23：00,其调控激发蝗虫趋光效果良好, 光照至24：00,蝗虫趋光总响应率及聚集率分布达到了80%±5%和50%±5%,然而,蝗虫的生物习性及智慧性、蝗虫夜间活力降低的趋光惰性、环境因素、LED光源调控性光照强度增强的限制等制约蝗虫的趋光效应。     

农产品质量安全法实施中的问题及立法完善思考

介绍了现行农产品质量安全立法及管理存在责任机制不健全、有关部门监管权限不清晰等体制问题,以及农产品概念模糊、速测效力不明确等操作问题。结合执法实践中的这些问题,运用法社会学规范研究方法和比较研究方法,以农产品质量安全为制度目标,在强化监管的现行体制下,通过明确责任主体、解决执法实践问题等方式,提高农产品质量保障水平。     

病毒感染对Ⅰ型和Ⅱ型细胞凋亡影响的研究

细胞凋亡是多基因严格控制的过程如Bcl-2家族、胱冬酶家族、c-myc、P53等.随着分子生物学技术的发展,人们对多种细胞凋亡的过程有了相当的认识,但是病毒家族对机体感染过程中对凋亡发生和抑制的过程确切机制尚不完全清楚.该研究将集中阐述与经典的细胞凋亡和副凋亡相关的信号转导途径和病毒蛋白参与其中的多种调节因子的作用机理.     

Pathogenesis,prevention and treatment of COVID-19 based on Th17/Treg immune imbalance

The extremely severe epidemic situation of coronavirus disease 2019 （COVID-19） outbreak around the world with high infectiousness and rapid spread has become a public health emergency of international concern. The disease is caused by severe acute respiratory syndrome coronavirus 2 （SARS-CoV-2）， and cytokine storm is an important pathological manifestation. Related studies have shown that cytokine storm and dysregulation of host immune responses characterized by lymphopenia are important mechanisms for the pathogenesis of severe COVID-19. The immune response disorder of COVID-19 is closely related to T helper 17 cell/regulatory T cell （Th17/Treg） immune imbalance. SARS-CoV-2 infection leads to excessive activation of lung immune cells， forming a cytokine storm dominated by interleukin-6 （IL-6）. Then， the Th17/Treg immune balance is broken， forming a vicious circle， which eventually promotes the rapid aggravation of the disease. Finally， COVID-19 progresses into acute respiratory distress syndrome， and even respiratory failure until death. Therefore， it is more important to discuss the prevention and treatment of COVID-19 from the perspective of immune imbalance. On the view of treatment， before effective antiviral drugs and vaccines are successfully developed， we should pay attention to immune regulation for severe and critically ill patients. Treatments with inflammatory factor blockers， glucocorticoids， recovered plasma and traditional Chinese medicine have certain immunomodulatory effect. This article discusses the pathogenesis of COVID-19 based on Th17/Treg immune imbalance， and elaborates on immunomodulatory therapy， aiming to provide reference for the prevention and treatment of COVID-19 and drug development.     

植物花青素基因的克隆及应用——文献综述

评述了近十年来有关植物花青素的基因克隆研究进展及其应用前景。植物花青素代谢途径及其主要酶类的作用之研究已较为成熟，一大批调控植物花色的结构基因与调节基因已被克隆。利用外源基因导入、反义基因及共抑制原理已培育出了新色系观赏植物品种。用基因工程的方法培育蓝色月季的工作正在进行。利用结构基因和调节基因为创造新花色、植物体彩化、植物生长发育及研究植物的花青素代谢等开辟了广阔前景     

未来转基因作物的环境风险分析

 下一代转基因(GM)作物中新基因的不断增加和基因叠加,以及用GM作物作为生物反应器生产药物和工业用化合物,使GM作物的环境风险评价更加复杂和困难。讨论了存在的问题、未来监管政策和应当加强的相关研究领域。     

ZENITH LUMINANCE CONVERTING FROM SKY ILLUMINANCE

This paper suggests a zenith luminance converting factor. By means of multiplying outdoor horizontal sky illuminance by this factor, the value of zenith luminance of the sky can be obtained.     

A SURVEY STATION OF MEASURING DAYLIGHT AND SOLAR IRRADIANCE IN CHONGQING

This paper intreduces a survey station of measuring daylight and solar irradiancein Chongqing.It has been set up for responding to the International Dayllght Year.From the ways ofmeasuring place,instruments,data and results,etc. the station has run successively in two years tomeasure eleven data about irradiance and illumination etc. by automatic measuring systems.A vastamoun t of scientific data is collected and these firstha nd reliable in formations are provided to day-light climates research in Chongqing.Both data results and measuring means corne up to advancedworld standards.Modern science and technology are successfully applled to daylight measuring andresearch.