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Biomedical subjects

D Rodríguez

Publications and source records attributed to D Rodríguez.

18 recordsLinked to original sources
PubMed1992

Thiobacillus ferrooxidans detection using immunoelectron microscopy.

A specific, fast and very sensitive immunoelectron microscopy method was developed to morphologically and serologically distinguish different cultures of iron oxidizers. Bacteria isolated from the acidic waters of "Matahambre" and "Mina Delita" mines (Cuba) were characterized. An antiserum specific to Thiobacillus ferrooxidans did not react with other bacteria also present in the acidic waters of mine drainage. Our results suggest the occurrence of some strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans in these waters.

Antibodies, Bacterial↗
PubMed1991

The influence of environment and parasitism on the prevalence of asthma in two Venezuelan regions.

The point prevalence of bronchial asthma and the influence of environmental conditions among 100 individuals chosen from two Venezuelan regions, i.e., rural and urban, were investigated by history, routine laboratory tests, determination of total and specific IgE antibody to common allergens and spirometric tests. The point prevalence of bronchial asthma was 3.0% in rural subjects who were also highly parasitized by helminths and 3.6% in subjects from the urban region. A significative difference in skin responses to Dermatophagoides pteronnysinus was observed in urban asthmatics when compared with rural asthmatics. A similar response to selected allergens was found among both populations. The prevalence of infestation by Ascaris in rural asthmatics was high compared with that of rural controls. Total IgE levels were elevated for both populations, but significatively higher (p less than 0.05) for rural individuals. Results suggest a significative point prevalence of bronchial asthma in both regions, despite the helminth infestation of rural subjects. The effects of environmental factors, their concentration and time of exposure are considered as main factors responsible for allergic reactivity observed in the Venezuelan regions studied.

Asthma↗
PubMed1984

Subdural hematomas of the posterior fossa in normal-weight newborns. Report of two cases.

Two cases are reported of subdural hematoma of the posterior fossa in normal-weight full-term newborn infants. The most salient factors in these cases were the lack of specific symptoms and signs indicating the nature and location of the lesion, the importance of computerized tomography for diagnosis, and the good results obtained with early surgical treatment.

Birth Weight↗
PubMed1976

Enzyme histochemistry of rat interfascicular oligodendroglia, with special reference to 5'-nucleotidase.

The interfascicular oligodendroglia of the rat striatum nucleus is studied in control animals and under experimentally induced brain edemas. Enzyme histochemical studies were performed. Normal oligodendrocytes show two different enzymatic distributions. While Mg2+-ATPase, TPPase, TPPase, adenylate cyclase and SDH are shown to be situated at the cell bodies and some proximal processes, 5'-nucleotidase reaction is seen at the cell fine distal processes. In spite of its trong activity in oligodendroglial endings the latter enzyme is not seen at the myelin sheath. This sheath and the interfascicular cells being intimately related, 5'-nucleotidase appears to be important not only during myelination, as almost all authors emphasize, but also in the adult myelin metabolism. Experimental brain edema shows some changes in the interfasicular oligodendroglia enzymatic activites for 5'-nucleotidase, Mg2+-ATPase and adenylate cyclase. A progressive disappearance of the former enzyme is observed. These features and those of derived from local ionic alterations may be concerned with the special susceptibility of white matter for some types of brain swellings.

Animals↗