热胁迫对辣椒花粉发育及其生活力的影晌     

韩笑冰  利容千  王建波  苗琛 《园艺学报》1996,(4)

用光学和荧光显微镜及扫描电镜观察等方法，研究了热胁迫对辣椒花粉形成发育、生活力、萌发率及雌性系统的影响。发现辣椒不同耐热性品种在高温胁迫下，花粉、花药发育过程出现异常，花粉生活力、体外萌发率下降，花粉管生长延迟，正在生长的花粉管伸长停滞。这些影响感热性品种比耐热性品种表现更为明显。在雌性系统中未见明显影响。  相似文献   

鸡深层发酵制作营养酱油的研究     

陈楚鋆  郑宝东 《食用菌学报》1996,(4)

鸡(土从)连续发酵生产营养酱油,其最适接种量为20％,发酵时间7d;果胶酶和纤维素酶混合处理发酵液,可显著提高氨基态N和总N含量,氨基酸生成率达62.8％。  相似文献   

三明市区家鼠寄生革螨的调查报告     

池毓棣  陈德红 《福建畜牧兽医》1995,(3):6-8

本文报告了三明市区家鼠寄生革螨的种类、组成、季节消长情况。观察一周年，共捕鼠７１１只，带螨鼠１４３只，带螨率为２０．１１％，检集革螨８７１只，鼠革蛲指数为１．２３只／鼠，鉴定为３属４种即毒厉螨、纳氏厉螨、柏氏禽刺螨和鼠颚毛厉螨；毒厉螨为优势种，占８１．８６％，平均螨指数为１．００只／鼠，各宿主动物间带情况存在差异。以褐家鼠最高，达３７．２０％，螨指数为２．７２只／鼠，革螨常年活动，以４－６月、８３  相似文献   

振动胁迫对杨梅果实采后衰老生理的影响   总被引：18，自引：0，他引：18  

郑永华  陈宗良 《园艺学报》1996,23(3):231-234

振动胁迫促进杨梅果实的衰老，表现为促进膜诱性的增加和ＳＯＤ活性与精胺含量的下降。但在振动胁迫后的贮藏初期，果实多源精胺的合成明显增加，而乙烯产生量明显降低，这可能是杨梅果实抗振动胁迫的一种应激机制。而在振动胁迫后的贮藏后期，果实的精胺含量降低，腐胺积累较多，乙烯产生量较高，表明振动胁迫最终促进果实的全面衰老。  相似文献   

几种中国野生菊的染色体组分析及亲缘关系初步研究   总被引：33，自引：6，他引：27  

陈发棣  陈佩度 《园艺学报》1996,23(1):67-72

通过对不同倍性的几种中国野生菊之间杂种F1减数分裂期染色体的配对分析,对它们的亲缘关系和演化过程进行了研究。观察到甘菊(Dendranthema lavandulifolium)和菊花脑(D.nankingense)是两个亲缘关系较近、但已发生了某种程度分化的二倍体;南京野菊(D.indicum)和尖叶野菊(D.indicum var.acutum)是含有相同染色体组的异源四倍体,毛华菊(D.sestitum)为异源六倍体,它们在减数分裂中期Ⅰ,染色体均能较好地配成二价体构型。尖叶野菊(4x)与菊花脑(2x)、南京野菊(4x)与毛华菊(6x)的F1,染色体配对构型分别接近于9Ⅰ 9Ⅱ和9Ⅰ 18Ⅱ,表明菊花脑或其近缘种是尖叶野菊染色体组之一的供体,南京野菊或其近缘种是毛华菊两个染色体组的供体。本文还对这几种菊属植物的演化过程进行了讨论。  相似文献   

灭幼脲类对玉米螟幼虫的生物活性及防治效果     

陈沛  弓惠芬  王瑞  夏志红 《植物保护学报》1982,9(4):217-222

本文报道灭幼脲类——TH_(6040)对玉米螟幼虫具有很高的生物活性及显著的防治效果。室内测定证明:玉米螟低龄幼虫在含有3ppm浓度TH_(6040)的人工饲料中取食后,存活率降低88～100％。田间试验证明:在春玉米心叶末期施用一次0.045％TH_(6040)颗粒剂,第一代幼虫存活数量降低80％。由此看出,具有改变昆虫生理功能作用的TH_(6040)可应用于玉米螟的综合防治。  相似文献   

A Case of Feline Papilliferous Mammary Adenocarcinoma with Widespread Metastases          下载免费PDF全文

Hsien-chuan Chen 《Canadian journal of veterinary research》1968,32(3):465-467

A papilliferous mammary adenocarcinoma with generalized metastasis, including multiple involvement of the brain, was found in a 14-year old female native born cat. No nervous signs except some behaviorial changes were noted.  相似文献   

一株惊纹地老虎幼虫颗粒体病毒的研究     

陈誉  朱国凯  蔡耘音 《植物保护学报》1983,10(1):11-18

1978年春,在新疆博湖从惊纹地老虎Agrotis exclamationis(Linné)(鳞翅目:夜蛾科)幼虫中发现一株病毒“Ae—02”,病毒颗粒体为卵形或卵圆形,大小为374～780×312～450nm,平均为578×412nm;病毒粒子杆状,两端钝圆,不弯曲或稍弯曲,大小为350～450×40～65nm,平均为395×50nm。该病毒对惊纹地老虎和黄地老虎A.segetum(Schiff.)幼虫致病力强。在日平均温度为24.2℃时,对1日龄惊纹地老虎幼虫感病19天后死亡率达96～100%;25天后10日龄幼虫死亡率达84～92%;对15日龄幼虫死亡率为73.96～80.96%。惊纹地老虎病毒“Ae—02”毒株,属杆状病毒科Baculoviridae,杆状病毒属Baculovirus,“B”亚组,定名为惊纹地老虎颗粒体病毒Agrotis excula-mationis granulosis virus,俗名鸣夜蛾颗粒体病毒,拉丁学名为Baculovirusexclamationis“B”,简称AeGV。  相似文献   

Antitumor principle constituents of Myrica rubra Var. acuminata   总被引：2，自引：0，他引：2  

Yang LL  Chang CC  Chen LG  Wang CC 《Journal of agricultural and food chemistry》2003,51(10):2974-2979

Myrica rubra var. acuminata is a native shrub widely distributed and used as folk medicine in Taiwan for stomach disorders and diarrhea. Column chromatography combined with cytotoxic bioassay-guided fractionation was performed to isolate the antitumor principles from fresh leaves of M. rubravar. acuminata. The 20% MeOH eluate fraction of M. rubra var. acuminata inhibited the viability of HeLa and P-388 cells in an in vitro assay and an in vivo P-388 tumor-bearing CDF(1) mouse model. The percent increase in life span (%ILS) of 20% MeOH eluate fraction was greater than 125%. (-)-Epigallocatechin 3-O-gallate (1) and prodelphinidin A-2,3'-O-gallate (2) were isolated from D-20 as the antitumor principle components. Both compounds can inhibit the growth of HeLa cells, but 1 had lower cytotoxic effects in normal cervical fibroblasts than did 2. Moreover, pretreatment with a caspase-3 specific inhibitor prevented 1- and 2-induced poly(ADP-ribose) polymerase cleavage. In view of these results, we suggest that 1 and 2 can induce apoptosis in HeLa cells and that activation of caspase-3 may provide a mechanistic explanation for their cytotoxic effects. Therefore, we suggest that the 20% MeOH eluate fraction extract is good for health and that M. rubra var. acuminata is an economically valuable plant.  相似文献   

Oral immunization using formalin-inactivated Actinobacillus pleuropneumoniae antigens entrapped in microspheres with aqueous dispersion polymers prepared using a co-spray drying process   总被引：2，自引：0，他引：2  

Liao CW  Chiou HY  Yeh KS  Chen JR  Weng CN 《Preventive veterinary medicine》2003,61(1):1-15

Oral-vaccine microspheres based on formalin-inactivated Actinobacillus pleuropneumoniae serotype 1 (AP-1) antigens and enteric-coated polymers were prepared using a co-spray drying process. We evaluated using this for a peroral vaccine. We measured specific-antibody titers and protection from challenge in mouse and pig models. In mice (24 per group), a subcutaneous aluminum-adjuvant vaccine or oral vaccination with three doses of AQ6-AP microspheres provided similar protection against intranasal challenge with 5 x 10(8) colony-formation units (cfu) of AP-1 bacterial culture broth. Two weeks after four oral vaccinations with 600 mg of AQ6-AP microsphere acetate solution (containing formalin-inactivated AP-1 antigens of 1.0 x 10(10) cfu bacterial broth), pigs (9 per group) were challenged intranasally with 1 ml of AP-1 bacterial culture broth (5 x 10(9) cfu). The clinical signs, percentage of pig survival ratio, lung lesion areas, and microscopic examinations indicated that the oral AQ6-AP vaccine provided more protection than vaccinating pigs intramuscularly with AP-1 aluminum vaccine.  相似文献