摘要:

AbstractA histochemical investigation on the content of ascorbic acid in chick embryonic tissues was undertaken using an improved technique. The concentration of ascorbic acid was found to be higher in the tissues which are involved in active biosynthetic mechanisms. Although the overall localization of ascorbic acid in intestine and proventriculus was less yet their secretory areas were rich in this vitamin. A significant successive increase in intensity of staining for ascorbic acid in the tissues from 15th to 21st day was evident from the data. The maximum ascorbic acid deposition was found in almost all the tissues of 21st day embryo as compared to the other age groups. This increase is correlated with the hatching process.

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00174.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractIn the skate,Raja radiata, the nerve fibres of the hypophysial stem, which connects the hypothalamus with the neuro‐intermediate lobe, are arranged with a median neurosecretory tract and lateral, presumably adrenergic, tracts. Transecting the median tract usually did not affect colour change,i.e.there was normal control of MSH secretion, whereas lesions in the lateral parts usually led to darkening,i.e.uninhibited MSH release. Deviations from this scheme in the present experiments and in the literature are easily explained by assuming slight anatomical variations in the ste

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00175.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractMorphological and histochemical studies of the cell types in the cephalic glands ofBothrops jararacahave been performed. It is concluded: 1) mucous cells are found in the salivary labial, accessory glands; mucous‐serous cells are found in the salivary labial, accessory and Harderian glands; serous‐mucous cells are found only in the venom gland; 2) neutral mucosubstances and protein were found in the salivary labial, venom, accessory and Harderian glands; 3) hyaluronic acid was detected in the Harderian gland; 4) of the to sulfated acid mucosubstances, only chondroitin sulfate B was detected in the salivary labial and accessory glands; 5) sialic acid was detected in the salivary labial, accessory and Harderian gla

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00176.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractThree different endocrine cell types were identified by electron microscopy in the rostral pars distalis (RPD) of the roach,Leuciscus rutilus. The cells which are characterized by the morphology and sizes of their secretory granules are assumed to secrete prolactin, ACTH and TSH. Prolactin cells occur in two forms which could be separated on account of the sizes of their granules.Intra‐peritoneal injections of reserpine had a strong and persistent effect 24 hours after the treatment. The prolactin cells with small granules reacted with a marked release of secretion.The border of the RPD is composed of a so‐called double basement membrane in contact with the perivascular spaces and forms extensive ramifications into the rostral neurohypophysis (RNH). Nerve fibers of different categories terminate at the border and its network in the RNH. Substances released from these terminals may influence the endocrine cells of the RPD. The ACTH cells and the prolactin cells are innervated by axons with granules less than 100 nm.The nomenclature of type ‘A’ fibers and ‘B’ fibers is discussed because it was difficult to make a reliable discrimination of the fibers and their nature by the sizes of their granules. However, four types of nerve fibers were distinguished in connection with the RPD although the presence of more types was indicated. In all four types the size variations of the granules are great and overlapping. The average sizes of the granules in these fibers are 157, 114, 119 and 81 nm. The origin of the nerve fibers innervating the RPD is discussed.All morphological data indicate a complex hypothalamic control of the RPD o

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00177.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractAnatomically the male reproductive organs ofHemiechinus auritus collarisare of considerable interest and present a unique pattern of arrangement of different glands. The testes are inguinal and a true scrotum is absent. A pair of accessory glands, the seminal vesicles, are situated dorsal to the bladder. A pair of obviously lobulated glands, ventral to the bladder, represent the internal prostate and a pair of compact glands situated outside the pelvis in para‐anal position the external prostate. The Cowper's gland and the gland of ampulla are absent.The present studies also concern enzymes of the phosphatase group, including both specific and non‐specific phosphatases, in the testes and the sex accessory glands during both active and inactive periods in this insectiv

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00178.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1974.tb00179.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY