桑树新品种育71-1的育成初报

育71—1是通过杂交、单株选择、株系选择和品比试验等一系列选育程序,培育成功的新桑树品种。其主要经济特性与湖桑32号相比,发芽期早2—3天,发芽率提高28.7％,产叶量提高47.7％,叶质较优,丝质成绩相仿;抗旱性较强。目前,正在江苏的海安、溧阳及山东等部分地区试种。     

Infection of human enterovirus 71 in immunosuppressed rhesus monkeys

AIM: To investigate the infection process of human enterovirus 71 (EV71) in a rhesus monkey model of immunosuppression.METHODS: The monkey immunosuppression model was established by oral administration of cyclosporin A at a daily dose of 15 mg/kg for 7 days. Fourteen days after inoculation of EV71 FY23 strain via respiratory and digestive tracts, the infectious monkeys were sacrificed, and then the pathological changes of systemic organs were observed and the viral analysis in different tissues was performed.RESULTS: Compared with the experimental group without cyclosporin A, more positive results were observed in the immunosuppressed monkeys, such as more severe clinical symptoms, higher viral load/antigen expression and more pathological changes in the organs.CONCLUSION: The findings of the viral multiplication in the host provide evidence for evaluation of EV71 vaccine, and also indicate the delimitation for the population using EV71 vaccine in future.     

优质中熟杂交早稻汕优45的选育与应用

汕优４５是湖北省咸宁市农科所用珍汕９７Ａ与早籼恢复系４５－１０配组选育而成的籼型杂交早稻新组合。该组合具有产量高、米质优，熟期短，抗病性强等特点，１９９９年３月通过湖北省品种审定。     

Deferoxamine Compensates for Decreases in B Cell Counts and Reduces Mortality in Enterovirus 71-Infected Mice

Enterovirus 71 is one of the major causative agents of hand, foot and mouth disease in children under six years of age. No vaccine or antiviral therapy is currently available. In this work, we found that the number of B cells was reduced in enterovirus 71-infected mice. Deferoxamine, a marine microbial natural product, compensated for the decreased levels of B cells caused by enterovirus 71 infection. The neutralizing antibody titer was also improved after deferoxamine treatment. Furthermore, deferoxamine relieved symptoms and reduced mortality and muscle damage caused by enterovirus 71 infection. This work suggested that deferoxamine has the potential for further development as a B cell-immunomodulator against enterovirus 71.     

基于两类全基因组距离的EV71型病毒亲缘关系分析

[目的]了解世界各地EV71病毒的亲缘关系。[方法]下载了NCBI数据库所有EV71全基因组序列,以常用的Kimura 2-parameter距离和E距离进行距离矩阵邻接法建树。[结果]基于E距离和Kimura 2-parameter距离构建的进化树结果一致,2种方法均支持EV71进化树反映出的基于全基因组的病毒亲缘关系。[结论]E距离是病毒系统发育应用中另一种颇具潜力的新距离,能为鉴定EV71病毒亲缘关系提供支持。     

汕优63在不同海拔高度种植的生育特点及高产栽培技术

汕优６３是浙江省临安县单季杂交稻当家组合．由于受不同海拔高度温光条件限制，一般限于海拔４００米以下地区种植。在适栽范围，应针对不同海拔高度气温和生育期变化，采取相应栽培技术措施．才能兴利避害，获得丰收。     

汕优63制种母本直播综合配套技术及应用

对汕优６３的制种技术进行了多年的试验探索，总结出了一套成功的制种方法，使制种单产大幅度提高。这些措施包括母本直播、父本两段育秧、化学除草等技术，具有省工、高产、高效，易操作等优点，对劳力少、制种连片面积大的农场或制种专业户更为适用，具有较好的推广应用前景。     

不同施氮量对汕优136产量及其构成因素的影响

通过汕优 136不同施氮量的试验 ,分析了不同施氮量对汕优 136产量及其构成因素的影响 ,得出了获取适宜的穗数是高产栽培的前提 ,形成足够的总颖花量是取得高产的基础 ,在此前提和基础上提高结实率和千粒重是取得高产的重要保证。汕优 136适宜穗数为 2 40万 /hm2 左右 ,总颖花量在 45 0 0 0万 /hm2 左右 ,是汕优 136取得高产的重要指标     

再生稻汕优63栽培因子的多项式回归分析

采用二次回归通用旋转设计,研究了移栽叶龄、促芽肥施用期及施用量、留桩高度及割后壮苗肥施用量5个因素与再生稻汕优63产量的回归关系,模拟并优选出单产3 375kg/hm~2以上的最佳技术体系,即移栽叶龄5.7-6.0叶,促芽肥于头季稻齐穗后12-14d施用,每公顷施用尿素189-202.5kg,留桩高度36-38cm,壮苗肥每公顷施用尿素138-147kg.经泰宁、尤溪、将乐等县较大面积的验证试验,证明本方案可行.     

烤烟外引品种NC 71烟叶样品质量研究

本研究以NC 71与对照品种K 326和NC 89在南北烟区9个省(市)的10个种植试点的烟叶样品为试材,在外观质量、常规化学成分、常规烟气成分、感官质量、主要致香成分五个方面进行了分析比较,结果表明NC 71在外观质量上与南北烟区对照品种K 326和NC 89相当,部分NC 71样品身份或油分稍好于对比品种;未检测出碱糖、碱氮、钾氯比值都较协调或是都不协调的样品,部分NC 71样品钾氯或碱糖和钾氯比值较协调。南方烟区湖南永州的NC 71样品碱糖和碱氮比值不协调;NC 71在焦油、一氧化碳和烟碱含量上总体高于照比品种;南北烟区种植试点的NC 71样品综合感官质量表现较好;北方烟区三种植试点NC 71致香物质总量优于NC 89,南方种植试点NC 71与K 326在致香物质含量上各有优势。