马立克氏病病毒囊膜糖蛋白B抗原Ⅰ型特异性和群共同性决定簇的单克隆抗体

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饲用微生物的高密度培养

高密度培养(HCDC,highcelldensityculture)以其优越性在发酵生产上得到了广泛的应用。它能获得高的产率,降低生产成本,从而提高产品在市场上的竞争力。将高密度培养技术用于直接饲用微生物(DFM)的生产中,对于提高发酵水平,更好地满足市场需求,具有重要的意义。     

电机护环钢在硝酸盐溶液中应力腐蚀开裂的控制过程研究

本文在文献［１］基础上，运用金相，电化学方法研究了５０Ｍｎ１８Ｃｒ４电机护环钢依照ＱＨＪ－７９试验标准在硝酸盐介质中应力腐蚀开裂（即ＳＣＣ）的性质，结果指出，此体系中ＳＣＣ的控制过程为阳极溶解。     

湖南省茶树黑刺粉虱寄生蜂调查

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裂谷热简介

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春制越年家蚕卵乙胚子冷藏方法研究

研究结果表明，春制越年家蚕卵丝乙胚子冷藏处理后，其实用孵化率〉９２．３％蚁蚕绝食致半数时数≥１１０ｈ，不良卵发生率〈１０％，发病率〈８．６％，茧质优良，产量平稳，在有效冷藏期限内随时出库催青饲育均安全可靠。     

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草甘膦是一种具有内吸传导、杀草谱广、毒性低等特性的新型化学除草剂,对根除茶园常见杂草有特效。用草甘膦防除茶园杂草的最佳浓度因杂草种类不同而异,以一、二年生杂草为主的茶园用0.10％的浓度为宜,以多年生杂草为主的茶园用0.15％的浓度较好。用液量以杂草充分湿润为度。全年喷药一次或二次即可,若喷一次,宜在五月下旬进行;若秋季草害较重,则在八月下旬复喷一次。使用该方法除草,全年只需耗药费4.80元～6.40/亩,除草效果优于全年人工除草三次者,节省除草工7～9个/亩,增产5～7％,对保持茶园生态平衡,提高茶叶品质均有益。     

洋葱型大蒜及其成因分析

洋葱型大蒜为大蒜鳞茎异常生理变态所形成的类似洋葱鳞茎结构的大蒜(原称“面包蒜”),该鳞茎主要由肥厚的叶鞘基部及鳞芽的外层鳞片加厚所构成,无肉质鳞片或肉质鳞片极不发达,可形成蒜薹或无薹分化,无任何食用价值。洋葱型大蒜的形成与N、P、K超量施用且配比不当,追N过多且时间过早,土壤过于粘重并长期处于水分饱和状态等有密切关系。     

林用架空索道导向滑车“h_2”值的确定

本文从理论上和实践上第一次论证了林用架空索道导向滑车的滑轮选择系数“h_2”为14,从而为导向滑车的设计和制造提供了新的可靠依据。     

Changes in the plasma concentrations of prolactin,luteinising hormone,progesterone and d‐(β)‐hydroxybutyrate in turkey hens (meleagris gallopavo), during treatment of broodiness under commercial conditions

1. An experiment was done under commercial conditions to investigate the physiological effects of isolating broody turkey hens, for 72 h, in sand and wire floored pens on the third, 10th and 16th weeks of production.

2. Hens identified as broody and removed from the flock had higher plasma prolactin concentrations than the laying hens at each of the three experimental stages.

3. Confinement in sand and wire floored pens, induced a decline in plasma prolactin concentrations. This decline probably impeded immediate development of broody behaviour. Alternately, levels of prolactin higher than those of laying hens were again measured 7 and 14 days after treatment during third week but not after the 10 th and 16th week of production.

4. Confinement did not induce consistent changes in luteinising hormone (LH) and progesterone concentrations from one period to an other.

5. An increase in the plasma concentration of D‐(/?)‐hydroxybutyrate was observed in the hens which had an egg present in the oviduct on day 2, 3 and/or 4 of the treatment. Subsequently, a decrease in ovulation rate was observed in the hens with higher concentrations of D‐(β)‐hydroxybutyrate while under treatment, during the 10th week of production.

6. These data confirm that the effectiveness of the traditional methods for broodiness prevention under commercial conditions is related to the induction of a decrease of prolactin.