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Biomedical subjects

S Biswas

Publications and source records attributed to S Biswas.

At least 217 records · Page 12Linked to original sources
PubMed1980

Enhanced seminal plasma ribonuclease activities in azoospermia, severe oligiozoospermia, and asthenozoospermia.

Acid and alkaline ribonuclease (RNAase) activities were measured in human seminal plasma. The samples were obtained from patients attending an Infertility Clinic and were separated into groups according to the concentration and motility of spermatozoa. Levels of acid and alkaline RNAase activities in seminal plasma were, respectively, 22 and 13 times the values found in blood plasma. The severe oligozoospermic and azoospermic groups showed significantly higher alkaline RNAase activities in the seminal plasma than the normozoospermic group. The group with sperm motility < 50% showed significantly higher acid and alkaline RNAase activities than the group with motility greater than or equal to 50%. Enhanced RNAase activities may be involved in the process of bringing about a reduced formation and maturation and a reduced motility of spermatozoa.

Humans↗
PubMed1978

Fructose and hormone levels in semen: their correlations with sperm counts and motility.

Levels of fructose, growth hormone (GH), prolactin (HPr), follicle-stimulating hormone (FSH), luteinizing hormone (LH), and 5alpha-dihydrotestosterone (DHT) were determined in semen. The samples were obtained from patients attending an infertility clinic and separated into four groups according to the number of spermatozoa. Levels of HPr, LH, and FSH showed significant positive correlations with sperm counts. Significant differences in fructose and hormone levels were found between various groups. Expressed as concentrations of hormones or fructose per milliliter of semen, none of the hormones showed a significant negative correlation with sperm motility whereas fructose showed a significant negative correlation. Expressed as amounts per ejaculate of semen, only prolactin showed a significant positive correlation with sperm motility. The significance of these findings is discussed.

Cell Count↗
PubMed1978

Graft interposition splenocaval shunt for total or selective decompression of portal hypertension.

A new operation for selective or total decompression of the portal venous system in cases of intrahepatic portal hypertension is described. It involves interposition of a large-caliber Dacron graft between the splenic vein and the inferior vena cava. The graft-interposition splenocaval shunt is performed readily and quickly, satisfying the variable hemodynamic needs of patients with portal hypertension. It can be either selective (S-SCS) or total (T-SCS) from the beginning, or a T-SCS may be converted subsequently to a S-SCS should surgically induced hepatic decompensation supervene. It is less demanding technically than distal splenorenal shunt (D-SRS). The S-SCS conserves portal venous perfusion of the liver, preserves hepatocellular function and architecture at the preoperative levels, avoids precipitation of postshunt portal-systemic encephalopathy, and decompresses gastric-esophageal varices with prevention of further variceal bleeding even better than D-SRS. One hundred percent graft patency has been obtained, and the surgical results have been superior to those following portacaval shunt in patients with large liver blood flow and relative benignity of the liver disease, be it cirrhosis or noncirrhotic portal fibrosis. In patients with advanced cirrhosis, variceal bleeding, and small liver blood flows, T-SCS would be indicated. Patients of this category obtained inferior surgical results and had operative deaths (16.7%) following S-SCS. The concept of the operation has merits and deserves further evaluation.

Adolescent↗