A gonadotropin releasing hormone analog induces spermiation in intact and hypophysectomized frogs, Rana esculenta

The sperm-releasing activity of a gonadotropin releasing hormone (GnRH) agonist, Buserelin (GnRH) and hypophysis homogenate (PD) preparations was studied in intact and hypophysectomized (PDX) frogs, Rana esculenta. In addition, human chorion gonadotropin (hCG) was tested in PDX animals, and GnRH antagonist (GnRHA) treatments were carried out in intact and PDX animals, in combination with the hormonal injections. GnRH or PD treatments were able to elicit spermiation in intact and PDX animals. While GnRH, injected 24 h later, was again effective in inducing spermiation in intact animals, this was not the case in PDX frogs. GnRHA counteracted GnRH effects in intact frogs. Moreover, in PDX animals GnRHA injections counteracted the sperm-releasing activity induced by hCG or GnRH, but failed to inhibit sperm-releasing activity induced by PD homogenate.     

稳态浮选流程的计算机仿真

笔者以Kelsall的快慢浮离散分布速率常数模型为基础建立单槽浮选机模块ONECEL,并在微型机上建立通用的稳态浮选流程仿真器SIMFLOT,可以仿真任意结构的浮选流程。笔者还以从实际值和计算值差的加权平方和为目标函数,采用SUMT混合罚函数法估计模型参数,并编制了相应的程序ESTIFLOT。实例以德兴铜矿生产数据作为仿真标准条件,原始数据经物料平衡程序包CSIMMBAL处理,用ESTIFLOT估计出模型参数,最后用SIMFLOT进行仿真运算,仿真结果令人满意。     

Absorption ofL-lysine in the small intestine of rats

Zusammenfassung l-Lysin wird durch die Rattendarmschleimhaut mit einer je nach den Anfangskonzentrationen verschiedenen Geschwindigkeit absorbiert. Die anfänglichen Lysin-konzentrationen stellen beim Transport der Diaminosäure durch die Darmvilli ein die Reaktionen abschwächendes Moment dar.     

商业企业开发计算机管理信息系统的若干问题

采用系统工程的方法开发计算机管理信息系统,调研细致充分、分析透彻入理,设计规范化。     

In vitro enhancement of human platelet aggregation by somatostatin

Summary Very low concentrations of somatostatin (S-14) strongly potentiate the in vitro aggregation induced by collagen, ristocetin and arachidonic acid, but not that induced by ADP or epinephrine, in both human platelet rich plasmas and gel-filtered platelet preparations. Desensitization phenomena may be induced either by repeated addition of S-14 or long lasting contact between S-14 and platelets.     

Effects of anesthesia,surgical manipulation and dehydration on the nucleic acid and protein content of the pituitary and hypothalamus of the frog

Summary Various types of stress, chemical or surgical, have a negative influence on the protein and RNA content of the hypothalamo-hypophyseal system ofRana esculenta. A degree of recovery occurs in these tissues 24 h after MS222 anaesthesia and laparatomy. Decapitation is apparently the most suitable method of sacrificing the animals.Work supported by the National Research Council of Italy.     

热电动势法快速测定微碳铬铁中硅含量

用热电动势法快速测定了微碳铬铁中硅含量．当冷热端温度差为２８０℃和黄铜为参比极时，热电动势Ｅ＿ｔ与待测极微碳铬铁中硅含量［％Ｓｉ］间有如下关系：Ｅ＿ｔ＝１４．２３８—０．５８２［％Ｓｉ］，ｍＶ．其测量精度与化学法和光谱法相比．分别为±０．０４％Ｓｉ和±０．０２８％Ｓｉ．每次测试时间为３０ｓ．     

岩石可钻性钻速模式研究

地层是钻井工程最直接的研究对象,地层是影响钻速的最重要因素。本文主要讨论如何寻求地层可钻性钻速模式。试验与计算结果表明,在标准化条件下,方程V=bw~a的系数a、b主要受地层的微可钻性级值的影响,它们都是可钻性级值Kd的函数,且这种函数有区域性。通过对地质单元上的a、b值变化规律的研究求出了五个油田统一的可钻性钻速模式。