An Ig-A-like substance in the chicken's pineal

Summary Immunohistochemistry revealed an Ig-A-like substance on the luminal surface of the pineal follicles and in the parafollicular layer. This substance was observed around 1 week of age and disappeared by 8 weeks at the time when the transformation of the follicular pattern leads to an adult-type pineal tissue.     

Pineal ‘synaptic’ ribbon numbers and melatonin synthesis of rat are resistant to guanethidine sympathectomy

Chemical sympathectomy is widely used to study the impact of the noradrenergic system on neuronal and neuroendocrine circuits. We tested the effects of intraperitoneal injections of guanethidine, an adrenergic neuron blocking agent, on selected functional parameters of the rat pineal gland which are known to be under sympathetic influence. The reliability of the method was demonstrated by the clear enophthalmus developed by experimental animals. However, neither the numbers of synaptic ribbons nor melatonin synthesis differed between treated and control rats, both parameters exhibiting the nocturnal increase seen in intact animals. These results are in striking contrast to those obtained upon chemical sympathectomy with 6-hydroxydopamine or surgical superior cervical ganglionectomy. We conclude that guanethidine is not capable of sufficiently removing noradrenergic influence from the rat pineal gland, and that this substance is thus inferior to other experimental methods of sympathectomy.     

大弹涂鱼松果体形态结构研究

鱼类松果体是传达外界信息到体内的主要传感器之一,其分泌的褪黑激素与鱼类生殖活动密切相关.为了阐明大弹涂鱼松果体形态结构与其功能的关系,运用组织细胞学方法研究了大弹涂鱼松果体的形态结构.结果表明,大弹涂鱼松果体位于端脑和中脑之间,由松果体柄和终囊两部分组成,具有背囊结构.松果体柄细长,细胞排列紧密,柄中有空腔,开口与第三脑室相通;松果体终囊膨大成梨形,且有空腔,腔内有皱褶,终囊顶部表面有黑色素细胞;背囊位于终囊下方,形状不规则,其囊壁向囊腔内反复折叠,形成许多复杂、盘旋曲折的内褶,背囊内部可见血细胞.研究结果为将来揭示大弹涂鱼半月周期产卵的机制提供了基础资料.     

草原沙蜥顶眼组织结构的半薄切片观察

草原沙蜥顶眼的角膜是由位于顶眼部位的皮肤特化形成，皮肤细胞色素消失，外表面的立方形细胞变为扁平细胞，其下的基质逐渐增厚，纤维增多，透明成角膜。晶状体与角膜紧密相贴，由交错排列的的几层柱状细胞组成，视网膜和晶状体相连，由感光细胞，色素细胞和神经节细胞组成，在由晶状体和视网膜围成的眼腔中，有玻璃体样结构分布，偶见有散在的细胞位于玻璃体样结构中。     

4种变温动物松果腺复合体的形态结构比较

本文采用光镜和透射电镜，对日本七鳃鳗，黑斑蛙和丽斑麻蜥４种变动物的松果腺复合体，进行了观察和比较，并对其结构与功能的关系作了初步探讨，变温动物的松果腺复合体，由副松果体和松果体构成，在系统发育中，副松果体始终是光感受器，松果体则从光感觉器向着内分泌腺发展，从这４种动物松果腺复合体的变化揭示；最早脊椎动物的松果眼是２个，以后在动物从低等向高等进化中，其中一个保留在变温动物，始终是光感觉器，另一个变成     

Photoreceptors in the pineal of lower vertebrates: Functional aspects

Summary The pineal of lower vertebrates characteristically contains true and modified photoreceptors with functional und structural homologies to retinal photoreceptors. Afferent nerves convey photic information from the pineal to sensory areas of the brain stem. Light also influences synthetic activity within the organ, controlling the rhythm in melatonin production which is generated endogenously. The molecular mechanisms underlying this rhythmic event are described and the hypothesis advanced that the pineal transduces several forms of environmental stimulus involved in the regulation of rhythmic function.     

Evidence for no relationship of the pineal activity with the neonatal shrinkage of Leydig cells in the rat

Summary The collective volume of Leydig cells in prenatally pinealectomized newborn rats declined as sharply as in intact newborn rats. Also, the collective volume in pups born in the dark declined in a fashion similar to that in pups born in the light. The results indicate that neither the pineal gland nor the light is responsible for the neonatal shrinkage of Leydig cells.This study was supported in part by a Grant-in Aid for Scientific Research (No. 548067) from the Ministry of Education, Science and Culture of Japan.     

高感度、高分辨率聚酯型光致抗蚀剂—聚呋喃丙烯叉丙二酸-1,3-丙二酯的研制及其应用

以改进后的高分子反应法制得了聚呋喃丙烯叉丙二酸-1,3-丙二酯,合成反应时间短,光敏侧基的引进程度高。其光刻应用的最佳曝光时间为8秒(80W汞灯),分辨率0.75μ,是一种高感度、高分辨率聚酯型光致抗蚀剂的新品种。     

Pineal function cannot prevent the occurrence of castration cells in male rats

Summary The relationship between the pineal gland and the pituitary gland was investigated in male rats. The results indicate that the hypothalamo-adenohypophysial-gonadal axis is affected by the pineal gland, but the appearance of castration cells following gonal ablation may be only slightly modified by alterations in pineal gland function.