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Biomedical subjects

S A Kulkarni

Publications and source records attributed to S A Kulkarni.

15 recordsLinked to original sources
PubMed2001

Quantitative structure-activity relationships based on functional and structural characteristics of organic compounds.

In the present quantitative structure-activity relationship (QSAR) modeling, organic compounds, including priority pollutants, have been considered and classified based on their functional and structural characteristics. Five physico-chemical characteristics have been used to develop a QSAR model for Pimephales promelas, by means of multiple regression analysis. Collinearity diagnostics was carried out using two different approaches based on condition index and K correlation index. The outlier analysis was carried out using the variable subsets obtained through both the approaches. An attempt has been made to justify the deletion of outliers in each group referring to their physico-chemical characteristics. The expressions obtained by using both approaches provide almost the same prediction accuracy, however, the latter approach resulted in expressions with reduced number of molecular descriptors. The QSARs obtained through this exercise would certainly assist in designing environment-friendly molecules with lower toxicity.

Animals↗
PubMed1991

Cellular distribution of inhibin in marmoset testes during development.

Using polyclonal antibodies against a 13 KD human testicular inhibin, immunocytochemical localization studies were carried out in marmoset monkey testes. The pattern as well as the intensity of immunocytochemical staining for inhibin vary substantially during development. In early development (day 1 to 2 months) Leydig cells are the predominant cell types showing intense staining which reaches its nadir at 3 months. Subsequently both Sertoli cells as well as Leydig cells show equal intensity of inhibin staining. Testicular inhibin is likely to play a vital role in cell to cell communication.

Animals↗
PubMed1991

FSH in testes of marmosets during development: immunocytochemical localization and de novo biosynthesis.

Immunocytochemical localization of FSH was carried out in various cell types of marmoset testes during development using antisera generated against intact as well as beta-subunit of human FSH. Significant differences in the intensity as well as distribution of FSH in various cell types were observed in neonatal, pubertal, and adult marmosets. Intensity of staining in Leydig cells was maximum at day 1 and in adults (1-3 years), whereas it was minimum at 3 months. In seminiferous tubules (Sertoli cells), FSH was present in trace amount until puberty and subsequently increased at maturity. Further studies demonstrate de novo biosynthesis of FSH-like moiety in vitro by testicular tissue, which was age dependent.

Animals↗
PubMed1991

Prostate--an extrapituitary source of follicle-stimulating hormone (FSH): occurrence, localization, and de novo biosynthesis and its hormonal modulation in primates and rodents.

A comparative study on the immunocytochemical localization, de novo biosynthesis, and hormonal modulation of follicle-stimulating hormone (FSH) was carried out in the prostates of man, monkey, dog, guinea pig, hamster, rat, and mouse. FSH was localized in the cytoplasm of the prostatic epithelial cells. In some specimens, staining was also observed in the nucleus. Both pituitary as well as prostatic FSH were coeluted on a Sephadex G-100 column and high-performance liquid chromatography (HPLC) indicating physicochemical similarities of FSH in both the tissues. Surprisingly, the modulation of pituitary and prostatic FSH by inhibin and its related peptides were comparable. The intensity and grandularity of FSH staining was stronger in the case of benign prostatic hyperplasia as compared with normal prostatic specimens. In view of the well-known effects of FSH on the cellular growth, differentiation, and function of gonadal tissues, a similar role for FSH in pathophysiology of prostate is postulated.

Adult↗
PubMed1991

Disseminated nocardiosis.

A middle aged female suffering from idiopathic thrombocytopenic purpura (ITP), on treatment with steroids, developed bronchopneumonia and pyopneumothorax due to opportunistic infection by Nocardia asteroides. Aspirates obtained from the lungs, liver, spleen, kidneys and bone marrow were positive for Nocardia asteroides, confirming disseminated infection in an immunocompromised host. The patient succumbed to the infection.

Adult↗
PubMed1990

Primary intramuscular cold abscess in the left deltoid region: a case report.

A case of primary intramuscular cold abscess in the left deltoid region is described. There was no underlying bone lesion in relation to cervical or thoracic spine, shoulder joint or upper humerus, and clavicle. It is postulated that the cold abscess might have developed as a result of reactivation of BCG lesion when the patient received a fresh dose of tubercular bacilli which produced only lymph node enlargement in the mediastinum because of the partial immunity the patient had.

Abscess↗
PubMed1975

Model of an oculomotor subsystem.

One of the complex control systems present in the human body is the oculomotor control system. There are two major modes of ocular movements, viz. saccadic and smooth pursuit. More knowledge about the neuromuscular mechanisms controlling these eye movements is obtained if experiments are carried out on subjects whose two types of eye movements are differentially affected due to disorders at their higher centres of control. Eye movements of patients with a novel form of Heredo-familial Spinocerebellar Degeneration have been measured and quantified. These have been compared with those of normal subjects. Subsequent analysis indicates a continuous fourth order transfer function for the smooth pursuit eye-in-skull movements in the horizontal plane with head stationary.

Cerebellar Ataxia↗
PubMedDate not supplied

In silico techniques for the study and prediction of xenobiotic metabolism: a review.

Knowledge about metabolism is very important to understand the health risks posed by chemicals. The biochemical process of metabolism causes activation, inactivation, toxification, detoxification as well as changes in the physicochemical properties of a chemical. The long time consumption and high costs associated with animal tests and the challenges faced by traditional quantitative structure-activity relationship (QSAR) models in dealing with situations wherein parent chemical structures are less relevant to the ultimate effects have led to the development of in silico techniques for the prediction of xenobiotic metabolism. The strengths and limitations of some of the most commonly used in silico expert systems, and their application in studying metabolism of xenobiotic chemicals, have been reviewed. The in silico metabolism simulators possessed several distinguishing features imparted in part by the nature of knowledge rules (algorithms) encoded within them and in part by the integration of QSAR libraries and computational engines.

Algorithms↗
PubMedDate not supplied

Immunocytochemical localization of bioregulatory peptides in marmoset testes.

Immunocytochemical localization of neuropeptides (beta-endorphin, substance P, arginine vasopressin, oxytocin), pituitary hormones (adrenocorticotropin, prolactin, growth hormone, follicle stimulating hormone (FSH), gonadal inhibin, gastrin, and human chorionic gonadotrophin (hCG)) was carried out in marmoset testis during development. Both intensity of immunostaining and distribution of these peptides in testicular compartments viz. seminiferous tubules and Leydig cells changed dramatically during development. In vitro biosynthesis of inhibin and FSH was increased by hCG, whereas prolactin (5 micrograms) and prostatic inhibin peptide suppressed the synthesis of these hormones.

Aging↗