摘要:

Age changes in the structure of the seminal vesicles and in the rate of production of fructose and citric acid have been studied in a Brazilian (Nelore) zebu, from the fetal period to 36 months of age. At 3 and 6 months, the microscopic anatomy of the gland resembled that of the fetus; the tubules of the seminal vesicles had a reduced diameter and a low epithelial layer; only a few presented traces of secretion, and tissue contents of fructose and citric acid were accordingly low. At 12 months, the tubules were more ramified and had a larger diameter. In the 18-month-old animals the seminal vesicles presented substantial modifications; the tubules were large, with irregular lumina and surrounded by narrow stroma, the epithelial layer was higher than that of previous stages and its columnar cells had nuclei located basally. Tissue levels of fructose increased rapidly between 12 and 18 months. At 24 months, the seminal vesicles had reached the adult condition characterized by intense proliferation of tubules with irregular lumina and abundant secretory material. Numerous dark columnar cells were found in the epithelium. Seminal vesicles of Nelore zebus contain less fructose and citric acid than those of taurine bulls of comparable age.

ISSN:1422-6405    

DOI:10.1159/000145031

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

The histochemistry of mucins in the submaxillary salivary gland has been studied in 10 buffaloes of different age groups. The acidic mucins exhibited moderate to intense reaction in new-born and young animals; in adult animals, these were noticed in patches. Neutral and non-sulphated mucins were observed in traces and in mild amounts, respectively, in the mucous secretory end-pieces of different age groups; sialomucins were seen in moderate to intense concentrations. The seromucous end-pieces revealed traces of neutral mucins in new-born buffalo calves and moderate to intense concentrations in young and adult animals. These structures showed mild concentration of acidic mucins, hyaluronic acid and sialomucins. Sulphated and non-sulphated mucins were observed in traces in the seromucous end-pieces. The apical border of the lining cells of the intra- and interlobular ducts contained moderate to intense concentrations of acidic mucins. In young and adult animals, the epithelial cells showed mild to moderate reaction for neutral mucins. Goblet cells of the interlobular ducts exhibited the presence of mild and intense concentrations of sialo- and sulphomucins, respectively.

ISSN:1422-6405    

DOI:10.1159/000145032

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

A quantitative acetylcholinesterase enzyme-histochemical study was performed with microdensitometric methods in the hippocampus of the rat in order to correlate this enzymatic activity with the different zones of the hippocampal pyramidal layer. Higher values of acetylcholinesterase activity were found in the CA3 pyramidal zone. CA1 and CA4 showed the same activity, while the stratum oriens at CA3 showed the highest values among the hippocampal layers studied. The results were correlated with differences in septal afferences.

ISSN:1422-6405    

DOI:10.1159/000145033

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

The gross anatomy and the internal structure of the marmoset (Callithrix jacchus) brain are described based on the observations made on the material obtained from 10 adult animals (native name: sagui). 5 brains were used for gross anatomical observations; the other 5 brains, included in toto in celloidin, were cut into serial sections, properly stained and used for comparative studies óî the internal structure. Only general descriptions are given considering the brain because, in further papers, it is intended to go on describing in details the nervous system of this small primate, very common in Brazilian jungles and easily domesticated. It shows to be a very good and inexpensive animal for neurophysiological experiment

ISSN:1422-6405    

DOI:10.1159/000145034

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

Bones from different portions of human skeleton are polished and cut to suitable sizes and then subjected to micro-indentation at various loads using Vicker’s diamond pyramidal indenter. The Vicker’s hardness number is found to differ slightly from portion to portion of the skeleton. Interferometric studies of the indentation reveal that the applied stress of indentation causes a ‘pile-up’ of material near the corners of the pyramidal

ISSN:1422-6405    

DOI:10.1159/000145035

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

Irradiation of Xenopus tadpoles may cause precocious metamorphosis related to deprivation of food caused by gut damage. This makes the interpretation of the effects of X-rays on individual organ systems, such as the gonads, difficult.

ISSN:1422-6405    

DOI:10.1159/000145036

出版商:S. Karger AG    

年代:1979

数据来源: Karger