葡萄花型(性别)基因型的研究

通过对葡萄野生种与欧洲品种 4个杂交组合的亲代及F1代花型分析 ,认为毛葡萄旬阳 - 3(♀ )和 83-4 - 96 (♀ )的基因型为同质FF ,华东葡萄广西 - 2 ( )基因型为异质MF ,欧洲品种白玉霓、白诗南、粉红玫瑰和五月紫 (都为两性花 )基因型为异质HF。试验结果与LevadouxL提出的假说基本相符     

京派小说民间狂欢的隐形书写

探讨中国伦理的现代性传统,把目光聚焦于那些显而易见的大传统、同时也要关注那些不够显性的隐性的小传统。在中国传统的性观念中纵欲与节欲两种性道德观同时并存、交互作用。但是做为主流的精英文化基本上是将性的功能等同于生殖,认为性享乐是可耻的。而在民间文化的原生态中存在着对性爱的毫无羞涩的向往倾向。     

矿物质添加剂对动物性别影响的研究第一报─—锌和镁对仔鼠性别的影响

对小鼠、兔、乃至牛等动物进行系列矿物质添加剂影响动物性别的研究。通过初步实验，证实在成鼠饲料中加入５００ｐｐｍＺｎＯ或５００ｐｐｎＭｇＯ皆能使仔鼠雌性显著增多；在饲料中加入５００ｐｐｍＺｎＯ和５００ｐｐｍＭｇＯ，在后代性别上二者之间无显著差异。     

精氨酸对奶牛产雌率的影响

采用三种浓度（4．5％、5．5％和6．5％）的精氨酸对108头奶牛进行产母犊率试验．结果显示,试验组比对照组提高8．9％．13．34％,以5．5％精氨酸浓度最为明显,两者差异显著（P〈0．05）,而试验组之间差异不显著．在情期受胎率方面,试验组与对照组比较,试验组低于对照组,两者差异显著（P〈0．05）．     

中华蟾蜍卵巢性类固醇激素受体的免疫细胞化学研究

为探讨两栖动物卵巢内不同性类固醇激素受体在卵子发育中的调控作用.采用免疫细胞化学方法,对中华蟾蜍不同发育时期卵泡中的雌激素受体、孕激素受体和雄激素受体进行了定位检测.结果发现,三种受体在不同发育时期的卵泡中均有阳性反应:雌激素受体在卵黄合成期和卵黄合成后期的滤泡细胞表达为强阳性,在卵母细胞胞质和核膜中呈弱阳性反应;孕激素受体在卵黄合成早期的滤泡细胞和卵母细胞质、核膜中表达均较弱,在卵黄合成后期表达均增强;雄激素受体在卵黄合成早期的滤泡细胞和卵母细胞胞质、核膜中表达也均较弱,在卵黄合成后期卵母细胞胞质和核膜中表达略有增强.     

畜禽性别决定相关基因的研究进展

在畜牧业生产中，很多经济性状都与性别有直接关系。因此，深入了解畜禽的性别决定和性别分化机制，进而对其进行鉴定和控制，不仅在科学研究方面具有重要意义，在生产中也具有重要的实用价值。本文对畜禽性别决定相关基因的研究进展进行了综述。     

性信息素大面积防治白杨透翅蛾应用技术研究

作者利用性信息素对杨树人工林的危险性蛀干害虫——白杨透翅蛾进行了大面积防治试验研究,平均诱捕率61.2％,防治后林地内平均虫口下降率75.3％,在阳光充足,郁闭度小的林缘空旷地向阳处效果好;单一林种被害率低,诱捕率较高,诱捕器以100～150m效果好;晴天气温高,风力小,光照长效果好。     

Volatile sex pheromone in the female German cockroach

Virgin German cockroach adult females release an attractant that can be extracted with organic solvents and trapped from air blown over sexually receptive females. Behavioral assays with an olfactometer showed that the attractant was produced exclusively by adult females and it elicited behavioral responses in adult males, confirming its function as a female sex pheromone. Using behavioral and electrophysiological assays, we localized the site of pheromone production on the tenth abdominal tergite where an adult female-specific gland is found. Females whose glands were ablated were significantly less attractive to males than sham-operated control females.     

Rhythmic extrusion of pheromone gland elevates pheromone release rate

Summary In two arctiid species,Holomelina lamae andH. aurantiaca, which rhythmically extrude and retract their abdominal tips during pheromone emission, pheromone glands contain up to three orders of magnitude more of the major component than in most Lepidoptera examined to date. Using an effluent collection technique, relatively high rates of pheromone emission were obtained from freely calling females. In contrast, volatilization rates from forcibly extruded glands were about 25 times lower for both species, suggesting that pulsation of the gland functions to increase the release rate.We thank R. Charlton, R. Collins, J. Tang and R. Webster for valuable discussions D. Smith for drawing of the figure, and Dr Robert W. Astheimer of Barnes Engineering for generously donating his time and an IR Microscope used in remote temperature measurements.     

Endogenous suppression of pheromone production in virgin female moths

Summary Sexual receptivity generally is reduced in moths after mating. We found that even in virginHeliothis zea females the titer of pheromone declines after the third night of adult life, although the number of eggs laid increases. Reduction in pheromone titer is not due to reduced amounts of pheromone biosynthesis activating neuropeptide. We have discovered that a substance present in the bursa, ovaries and hemolymph of senescing virgins suppresses pheromone production. A similar factor was found in 2-day-old mated females indicating that both virgin and mated females use this factor to suppress pheromone production.