Comparison of the responsiveness of isolated arteries and veins taken from the same dogs 17 days apart

Summary The present experiments demonstrate that isolated arteries and veins taken from the same dogs before and after an interval of 17 days show comparable responses to adrenergic nerve stimulation, exogenous norepinephrine and depolarizing solution. They provide an acceptable model for the in vitro study of chronic influences on canine vascular responsiveness.     

Conclusion

The previous articles, demonstrating the importance of chemoreception in many aspects of fish reproduction, can be summarized in the following way.     

Influence des stimulations auditives sur le comportement sexuel du taureau

Summary In a preliminary series of experiments, it was noted that dairy bulls who refused to mount the cow for a long time, could be induced to mount it again when acoustically stimulated by specific calls of cows emitted by a magnetophone. In these conditions, the reaction time of the bulls was also shorter, while ejaculated quantities did not differ from those obtained before the experiments. It is suggested that this rather simple procedure could be helpful when the use of bulls as teasers raises difficulties.     

儿童注意力品质训练技术的研究与开发

传统注意力测验是以纸笔的形式进行测试。本研究依据陈国鹏等人编制的《中小学生注意力测验》所得五个因子：注意的稳定性、注意的广度、注意的转移、注意的持续性、注意的集中性开发了“儿童注意力品质游戏测验软件”。经检验,该软件有较好的信度和效度。它不仅可用于普通学生及注意缺陷儿童的注意测评,同时也可用该技术对学生进行注意力训练,从而提高注意缺陷儿童及普通学生的注意力品质。