Another cause of facial nerve palsy.
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Facial Paralysis↗
Biomedical subjects
D S Sheriff
Publications and source records attributed to D S Sheriff.
Estriol versus nonstress testing.
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Costs and Cost Analysis↗
Metallic elements in hydatid fluid.
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Animals↗
Harmful effects of smoking on spermatogenesis and steroidogenesis.
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Humans↗
Adolescent sexuality: a worldwide concern.
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Adolescent↗
The lipid composition of human epididymis.
In the present study the lipid composition of human epididymidis is reported. The total lipids represented 1.25 per cent of the total wet weight of the tissue. The phospholipids formed 64 per cent, cholesterol 12 per cent and glycerides 24 per cent of the total lipids. In patients with obstruction of efferent ducts, the total lipids were increased due to the significant in creases observed in glycerides and cholesterol of the epididymidis. There was a marked fall in epididymal phospholipids due to a fall in phosphatidyl choline and phosphatidyl ethanolamine.
Adult↗
Influence of hormones on testicular lipids of adult rats.
Testosterone, oestradiol-17 beta, progesterone and prolactin were administered for 1 and 7 days to adult rats to study the short- and long-term effects of these hormones on testicular lipids. Testosterone administration induced a marked increase in testicular phospholipids and a significant fall in glycerides. Oestrogen, on the other hand, provoked a significant increase in total lipids and glycerides with no marked changes in testicular phospholipids. Progesterone elicited significant changes in cholesterol fractions; a marked increase in esterified cholesterol with a concurrent fall in free cholesterol was observed. Prolactin treatment resulted in a significant fall in total lipids and phospholipids with no marked change in tissue weight. It also induced a marked fall in total and free cholesterol with a significant increase in esterified cholesterol.
Animals↗
The lipid composition of human testis in testicular feminization syndrome.
Testicular tissues obtained from 12 cases of testicular feminization syndrome were subjected to lipid analyses. The total lipids formed 2.75% of the total wet weight of the testicular tissue. Total cholesterol represented 30%, glycerides 33% and phospholipids 37% of the total lipids, respectively. Fractionation studies revealed that free cholesterol formed 66.7% and esterified cholesterol 33.3% of the total cholesterol. Triglycerides represented 89.89% and monoglycerides 10.11% of the total glycerides. Separation of phospholipids showed that phosphatidly choline (46.54%) and phosphatidly ethanolamine (24.89%) to be the major phosphoipid classes.
Adult↗
Role of prolactin on the development of the prepubertal testes of the rat.
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Animals↗
Lipids in human testis.
The lipid composition of human testis intesticular and post-testicular causes of infertility was studied. The testicular causes of infertility was represented by patients with adult seminiferous tubule failure and Klinefelter's syndrome. The post-testicular causes of infertility were represented by patients with obstruction of efferent ducts of testes. A significant accumulation of total testicular lipids was observed in both causes of infertility. A marked increase in free and esterified cholesterol, monoglycerides and triglycerides caused the accumulation of total testicular lipids in testicular causes of infertility. The accumulation of these lipids was more pronounced in Klinefelter's syndrome compared to adult seminiferous tubule failure. In post-testicular causes of infertility, a vary marked increase in phospholipids along with cholesterol fractions and glycerides led to the accumulation of total testicular lipids. The significant increase in total phospholipids caused by the increases in phosphatidylcholine and phosphatidylethanolamine differentiates post-testicular causes of infertility from testicular causes in which phospholipid classes remained unaffected. Thus, changes in hormonal mileu due to pathological conditions also lead to marked alterations in testicular lipids.
Adolescent↗
Prolactin and testicular lipids.
The effects of prolactin and prolactin plus progesterone (P-P) on the testes of adult rats were investigated. The weight of testes, seminal vesicles and the lipid composition of testes were studied 24 h after the administration of hormones. Prolactin treatment increased the weight of seminal vesicles but did not affect testicular weight, whereas P-P treatment had markedly reduced the weights of testes and seminal vesicles. Progesterone did not have any effect on the weight of testes and seminal vesicles. Both treatments had significantly reduced the total testicular lipids, which was more pronounced in the P-P treated group (28, 50%, respectively). The esterified cholesterol was increased by the administration of prolactin and P-P with a concurrent fall in the free cholesterol. The total cholesterol was depleted only by prolactin treatment. Testicular phospholipids, particularly the phosphatidylcholine and phosphatidylethanolamine were markedly depleted by these hormones. This action of prolactin is more significant in the presence of progesterone. The depletion of phospholipids appears to be mainly due to enhanced flow of testicular tubular fluid carrying away phospholipids from testis rather than a shift in the biosynthetic pathway favouring glyceride formation. In our previous study, it has been shown that progesterone favours accumulation of esterified cholesterol by depleting the available free cholesterol. Prolactin on the other hand depletes phospholipids and total cholesterol, increases esterified cholesterol. Thus, prolactin appears to have a role in steroidogensis as well as in the secretory processes of the testis.
Animals↗
Hormonal influence on testicular lipids.
The effects of progesterone and progesterone plus oestrogen (PPO) on testicular lipids of adult rats were studied. Treatment with progesterone over 7 days did not alter significantly the total lipids, cholesterol, glycerides and phospholipids. However, PPO administration brought about a significant elevation in total lipids, mainly contributed by the increase in triglycerides. The phospholipids and total cholesterol were not markedly affected by PPO treatment, but the individual classes of phospholipids showed marked alterations in their pattern of distribution. The esterified and free cholesterol fractions were found to be significantly altered by both the treatments. Progesterone appears to favour ester cholesterol accumulation by depleting the available free cholesterol. Oestrogen seems to increase the glycerides and change the concentration of phosphatidyl serine, phosphatidyl choline and phosphatidyl ethanolamine when administered with progesterone.
Animals↗
The lipid composition of human testis in patients with bilateral varicocele as cause of infertility.
The lipid composition of human testis in patients with bilateral varicocele as cause of infertility is presented. The total lipids formed 1.90 percent of the total wet weight of the tissue. Testicular cholesterol formed 26.50 percent, glycerides 28.50 percent and phospholipids 45 percent of the total lipids. The increase observed in total cholesterol, glycerides in the testis of patients with bilateral varicocele compared to the control group appears to suggest that non-utilization of cholesterol esters for androgen biosynthesis. Androgen deficiency would result in inhibition of spermatogenesis as shown by the histological examination of the bilateral testicular biopsy specimens. Testicular neutral lipids get altered whenever there is imparied steroidogenesis and spermatogenesis. Thus, testicular lipids may taken as one of the important indices of testicular function.
Adult↗
Interventions in reproduction.
Assisted reproductive technology has helped many childless couples. It has also raised questions about how appropriate the technology might be in different situations. How we understand parenthood is crucial in taking a stand on such scientific intervention. It is suggested that physicians should decide on offering artificial insemination, surrogacy and in-vitro fertilisation only after considering if the child will have good parents and if there will be legal complications from the use of the technology.
Female↗
Analysis of semen in a constantly changing social context of medicine.
Semen analysis is one of the most valuable diagnostic methods that play a critical role in andrology. The introduction of computer-assisted methods of human semen analysis [6], in vitro fertilization, and other auxiliary methodologies [4] has greatly enhanced the expectations of infertile couples in having a baby. However, routine semen analysis plays a significant role in an infertility clinic, particularly in developing countries. Standardization of routine semen analysis therefore becomes the key issue in laboratories involved in such analysis. Apart from that, semen analyses carried out in different populations bring out the changing pattern of semen quality due possibly to the influences of factors like lifestyle, race, population dynamics, and culture. It also helps to set standards of semen quality in the changing context of medicine.
Humans↗