Although malnutrition is considered to be a secondary immunodeficiency, some authors have reported that a deficient protein-calorie intake can improve the quality of immune responses in specific circumstances. It is possible that the deficient function of some T lymphocytes in malnourished individuals can be compensated by an increase in the number or biologic activity of others. Sprague-Dawley rats were subjected to experimental malnutrition for five weeks; this was followed by the utilization of splenic lymphocytes for rosette formation with sensitized red cells (EA) and Leydig cells. In animals with a hypoproteic diet there was a significant increase in lymphocytes forming EA rosettes; on the other hand there was a decrease in those united to Leydig cells. This can mean that malnourished rats compensate this deficit increasing its K lymphocytes or that ratios between suppressor and helper lymphocytes were altered.

Animals↗

PubMed1981

[The need for information in biomedical research].

This paper focuses on the need of every researcher to be informed on advances in his field. It reviews the means available for keeping abreast of developments in a specific area of scientific inquiry. In the author's view, articles in reference journals on a specific specialty are the best source of information. However, the interval between the writing and publication of a scientific paper is sometimes long, which poses a considerable impediment to the use of the traditional media as a means of keeping up. He also examines the limitations of information in biomedical research and reviews the characteristics of this research in Latin America. Finally, he makes a number of recommendations for improving scientific communications and making the most of the services of national and international information dissemination systems.

Information Services↗

PubMed1981

Equivalence of the HPO=4/H2PO-4 system. Nomographic solution. Nomogram of phosphate equivalence.

Explore the source record for details and available documents.

Buffers↗

PubMed1981

[Rationale and convenience of the International System of Units in clinical practice].

Explore the source record for details and available documents.

Diagnostic Tests, Routine↗

PubMed1980

The epidemiology of Entamoeba histolytica in Mexico City. A pilot survey I.

Stocks of intestinal amoebae isolated from hospital patients in Mexico City and grown in monoxenic culture were compared among themselves and with those already described (SARGEAUNT & WILLIAMS, 1979), using the electrophoretic patterns of four enzymes: glucose phosphate isomerase (GPI), phosphoglucomutase (PGM), L-malate:NADP+ oxido-reductase (oxalacetate-decarboxylating) (ME) and hexokinase (HK). New isoenzyme groups (SARGEAUNT & WILLIAMS, 1979) of all the amoebae, including Entamoeba histolytica have been demonstrated. Amongst these have been found seven more groups of E. histolytica, two new groups of E. hartmanni, one new group of Dientamoeba fragilis and one new group of E. coli. Of the seven new groups of E. histolytica three are known to originate from patients with clinical amoebiasis whilst the remainder are from asymptomatic subjects. Only 11.2% of the 125 isolations were associated with clinical amoebiasis, and these are clearly distinguished from the isolations from asymptomatic patients by their electrophoretic isoenzyme pattern.

Amoeba↗

PubMed1980