Biomedical subjects

B Grab

Publications and source records attributed to B Grab.

58 records · Page 4Linked to original sources

PubMed1966

The second International Standard for Dihydrostreptomycin.

The National Institute for Medical Research, London, was requested by the WHO Expert Committee on Biological Standardization to establish a second International Standard for Dihydrostreptomycin, since stocks of the first International Standard were depleted. A batch of 500 g of dihydrostreptomycin sulfate obtained in 1961 was distributed into ampoules in 200-mg amounts and dried in vacuo; the ampoules were then filled with dried nitrogen and sealed. The proposed replacement material has been assayed biologically in terms of the first International Standard in seven laboratories in six countries by means of both plate-diffusion and turbidimetric assays.Significant heterogeneity of the potencies obtained by the different laboratories was revealed by statistical analysis; this heterogeneity might be caused by slight differences in the content of streptomycin of the two samples. The material has been established as the Second International Standard for Dihydrostreptomycin with a defined potency of 820 IU/mg. The International Unit of Dihydrostreptomycin is defined as the activity of 0.001219 mg of the Second International Standard for Dihydrostreptomycin.

Dihydrostreptomycin Sulfate↗

PubMed1966

The international standard for novobiocin.

The National Institute for Medical Research, London, was requested by the WHO Expert Committee on Biological Standardization to arrange a collaborative assay of the International Reference Preparation of Novobiocin in order to define the International Unit of Novobiocin. The collaborative assay showed that the International Reference Preparation was not suitable for use as an international standard, and a second preparation of 400 g of novobiocin acid was obtained in 1962. This second preparation was distributed into ampoules in 100-mg amounts and dried in vacuum. The ampoules were then filled with dry nitrogen and sealed. This material-the proposed international standard for novobiocin-has been assayed biologically in eight laboratories in six countries by means of plate diffusion assays; it has been assayed against the working standard preparation of the US Food and Drug Administration.The variation in the potencies obtained for the second proposed international standard for novobiocin were small and not significant. The material has been established as the International Standard for Novobiocin with a defined potency of 970 International Units per mg, and the International Unit has been defined as the activity contained in 0.001031 mg of the International Standard.

Bacteria↗

PubMedDate not supplied

The role of circulating glucose and triglyceride concentrations and their interactions with other "risk factors" as determinants of arterial disease in nine diabetic population samples from the WHO multinational study.

In 9 of the 14 national samples of diabetic patients assembled for the WHO Multinational Study of Vascular Disease in Diabetes additional laboratory data made it possible to relate manifestations of macrovascular disease to blood glucose concentrations as well as to diabetes duration and to other potential determinants. In five of the samples, serum triglyceride concentrations were also measured and were included in simple and multivariate analyses. Ischemic heart disease defined from Minnesota-coded EKGs and standardized WHO questionnaires was more strongly associated with serum triglyceride concentrations than with serum cholesterol concentrations, an association less notable in non-insulin-dependent diabetic patients. Ischemic heart disease was not related to the single fasting plasma glucose estimated for this study. Stroke and amputation were much more strongly related to the known duration of diabetes than was ischemic heart disease, and they were both related to blood glucose concentration measured at the time of study. Despite major variation in arterial disease prevalence rates between collaborating centers, risk for diabetic women appeared to equal that for diabetic men. The major variation in arterial disease prevalence between national groups could be accounted for only in part by the risk factors studied. Other factors, genetic or more likely environmental, are likely to contribute to the variation in arterial disease susceptibility and, if definable, may be potentially preventable.

Adipose Tissue↗

PubMedDate not supplied

[Cardiovascular polymorbidity as a function of psycho-organic status. A series of 904 pathological and neuropathological comparisons].

In the past decades, the recognition of polymorbidity as an important characteristic of geriatric medicine lead to important improvements in the multidisciplinary approach of the elderly. Coexistence of somatic and psychiatric diseases with various forms of etiopathogenic relations has been described early in this century. Dementia may be caused, aggravated, revealed or randomly accompanied by somatic diseases and inversely. However, very few attempts have been made in order to analyze the significance of these associations. This study is meant to give a better epidemiological knowledge of the relation between cardiovascular diseases and cerebral aging. This could lead to a better diagnostic approach and to a more complete physiopathological conception of dementia. 904 autopsy reports (patients who died between 1972 and 1986 in the Hôpital de Gériatrie of Genova) have been reviewed and classified in three groups according to neuropathological findings: 335 subjects with vascular encephalopathy of various types, 382 patients with degenerative diseases of Alzheimer type and 187 patients with normal brain. The subjects of these three groups had not all been considered demented. For each patient, age, sex, cause of death and 14 cardiovascular items have been appointed. The patients of the Alzheimer group died older and were more often women than those of the two other groups. The subjects of the vascular group died older than those of the normal group and were more often men than those of the two other groups. Stoke was considered to be the cause of death in 3% of the vascular patients whereas, by definition, it was absent from the two other groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗