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Biomedical subjects

M I Osman

Publications and source records attributed to M I Osman.

At least 19 recordsLinked to original sources
PubMed1997

Exploring a mixture of distributions using Minitab.

A set of macros has been developed to help the user explore the characteristics of the two-component mixture of distributions. Five distributions are included: normal; exponential; Weibull; lognormal; and uniform. Using the powerful abilities of Minitab (version 9) the user can produce graphs for the conditional and unconditional density, cumulative density, survival and hazard functions. The mean of the unconditional distribution is calculated as the weighted average of the conditional means. A technique is programmed for calculating the unconditional median which cannot be derived mathematically. A What..if..? approach can be helpful in clarifying concepts such as sufficient conditions for unimodality, identifiability of mixtures, and hazard function of mixture of distributions.

Computer Graphics↗
PubMed1989

Vaginal eversion in a bat tick, Argas (Chiropterargas) boueti Roubaud and Colas-Belcour (Acari: Argasidae).

Vaginal eversion was observed in Argas (Chiropteragas) boueti. During eversion, both cervical and vestibular parts of the vagina are fully everted so that the former is anteriorly oriented, whereas the latter occupies the posterior end of the everted organ. The histology of normal and everted vaginas is described and correlated with its functional and biological significance. Vaginal eversion most likely occurs while the tick is ovipositing and may be involved in the wax-coating process of eggs by Gene's organ.

Animals↗
PubMed1985

Long-term follow-up after recovery from acute myocardial infarction. Observations on survival, ventricular arrhythmias, and sudden death.

A long-term 12-year follow-up of 248 patients surviving acute myocardial infarction indicated a cumulative survival of 89%, 68%, 53%, and 45% for 1, 5, 10, and 12 years, respectively. When patients were assessed with five routinely obtained clinical factors, significant prognostic stratification of high- and low-risk survival groups extended throughout the follow-up period. Sudden cardiac death was found to be twice as frequent as nonsudden cardiac death, but a significant relationship between sudden death and complex ventricular ectopic beats could not be defined. The extent of complex features of ventricular ectopic beats such as pairs, multiform, repetitive, and R-on-T was inversely related to survival. During the first year after acute myocardial infarction, frequency of ventricular ectopic beats was also inversely related to survival. A long-term effect of frequency on survival, however, could not be demonstrated.

Actuarial Analysis↗
PubMed1983

Endocrine profiles in pediatric andrology. II. Insulin-dependent diabetic adolescents.

Seventy-five diabetic male and female children and 75 matched controls were classified according to pubertal staging. Blood samples were assayed for gonadotropins and gonadal hormones. The ultimate adult height in diabetic patients was 5 cm less than that of controls. Almost all diabetic children had a retarded bone age. Levels of serum gonadotropins and gonadal hormones did not differ markedly between diabetic and healthy children. The delay in growth and maturation was not due to hormonal failure, but probably to chronic undernutrition of body cells and failure to utilize the amino acids for protein anabolism related to relative insulin deficiency.

Adolescent↗
PubMed1983

FSH, LH, E2, progesterone, and testosterone in peripheral blood, spermatic vein, and semen of subfertile men with varicocele.

Peripheral blood (PB), spermatic vein (Sp. V.), and semen samples were collected from 31 subfertile men with varicocele. Levels of FSH, LH, estradiol, progesterone, and testosterone were determined in the three biological fluid compartments using RIA. Remarkable increases in both testosterone and estradiol in the spermatic vein samples, as compared to either peripheral blood or semen, were evident. Correlation coefficient indicated significant positive correlation between PB FSH and each of PB LH, Sp. V. FSH, and Sp. V. LH. Significant positive correlation existed between PB LH and each of Sp. V. FSH, LH, and testosterone. Significant positive correlations were found between PB testosterone and each of Sp. V. testosterone and semen testosterone, as well as between PB estradiol and each of Sp. V. FSH and progesterone. Significant positive correlations between Sp. V. FSH and Sp. V. testicular progesterone was significantly correlated with seminal estradiol.

Adult↗
PubMed1983

Subdermal levonorgestrel implants: serum androgens.

Serum levels of androstenedione, dihydrotestosterone, and testosterone were determined by radioimmunoassay procedures in 25 female volunteers using subdermal levonorgestrel implants as a contraceptive. Mean serum androstenedione levels were increased after 1 and 6 months in comparison with preimplantation levels, the increase being significant only after 1 month. This could be attributed to increased production from the adrenal or ovaries and/or changes in clearance rate. Testosterone levels showed approximately 24% increase above basal values after 6 months' use of levonorgestrel implants, which was attributed to concomitant increases in androstenedione levels. The implication of these results is discussed.

Age Factors↗
PubMed1981

Endocrine profile of semen in subfertile males with varicocele.

The semen levels of FSH, LH, estradiol, progesterone, and testosterone were estimated in normal fertile males and in patients with oligozoospermia and varicocele. The only significant difference between the mean values of the two groups was noted for semen LH. Patients with oligozoospermia and varicocele had lower level than the normal fertile males. As a function of prostatic infection, no significant difference was obtained.

Aged↗
PubMed1981

Clinical and hormonal studies of subfertile males with varicocele.

To evaluate the hormonal factor in subfertile males with varicocele, FSH, LH, estradiol (E2), and testosterone (T) were assayed both from cubital and spermatic veins. The hormonal profile of patients showed no significant differences from the normal control group. Blood hormonal levels of E2 and T in the testicular veins were much higher than those in the cubital veins while FSH and LH levels showed no significant difference. FSH, LH, and testosterone blood levels in cubital and spermatic veins were statistically correlated. A preoperative hormonal study would be helpful in excluding cases in which varicocele is not the underlying cause of infertility.

Adult↗