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Biomedical subjects

A Sharma

Publications and source records attributed to A Sharma.

At least 685 records · Page 38Linked to original sources
PubMed1993

Clinical profile and outcome in enteric fever.

Sixty five blood culture positive cases of S. typhi were studied for clinical profile. A total of 64.6% were multidrug resistant and 35.4% were chloramphenicol sensitive. In patients with multidrug resistant S. typhi the age was higher (p < 0.01), and incidence of complications such as shock (35.7%), encephalopathy (42.9%), myocarditis (14.3%) and gastric hemorrhage (4.7%) were more frequent, compared to chloramphenicol sensitive group. Cases with multidrug resistant S. typhi (MDRST) were treated with oral ciprofloxacin; the period of defervescence of fever was significantly less (p < 0.05) compared to the chloramphenicol group. Our study suggests the use of ciprofloxacin in the treatment of MDRST without any side effects.

Adult↗
PubMed1993

Subcellular distribution of superoxide dismutase and catalase in human malarial parasite Plasmodium vivax.

Endogenous superoxide dismutase (SOD) has not been found to be present in P. vivax, a human malarial parasite and therefore it adopts and concentrates SOD from the host cell erythrocytes. It is demonstrated here that this adopted SOD from the host gets localized in lysosomes (10 k and 100 k fractions) of the malarial merozoites. P. vivax parasites were also found to contain very low levels of catalase, presumably as a result of contamination or adoption from the host red cell materials. It is therefore suggested that P. vivax merozoites are deficient in enzymes which are protective against the reactive oxygen species.

Animals↗
PubMed1993

Churg-Strauss syndrome presenting with marked eosinophilia and pericardial effusion.

The Churg-Strauss syndrome is a rare but treatable clinical entity. Its clinical presentation is thought to be stereotypic but is not. The authors report the first instance of a patient with the Churg-Strauss syndrome with hemodynamically significant pericardial effusion but without concurrent active pulmonary, renal or neurological involvement. Pericardial biopsy was the key to diagnosis and, therefore, therapy.

Biopsy↗
PubMed1992

Chromosomal alterations and sister chromatid exchanges induced by zirconium oxychloride in human lymphocytes in vitro with relation to age of donors.

Aqueous solutions of zirconium oxychloride were added to human peripheral blood lymphocyte culture. Cultures were set up from healthy donors of both sexes belonging to age groups of 0-10, 11-20, 21-30, 31-40, 41-50 and 51-60 years. Airdried Giemsa schedule was followed for preparation of chromosomal aberrations and micronuclei count. Flourescence plus Giemsa staining techniques were applied for the study of sister chromatid exchange. The endpoints screened were chromosome and chromatid breaks, dicentrics and rearrangements. The frequencies of chromosomal aberrations and sister chromatid exchanges induced were compared between the samples of different age groups. The frequency of CA could not be related to age of the donor. However, the frequency of SCE increased with increase in age of female donor.

Adolescent↗
PubMed1992

Clastogenic effect of fenfluramine in mice bone marrow cells in vivo.

Fenfluramine, an amphetamine derivative used in the treatment of obesity, has been evaluated in vivo in the bone marrow cells of Swiss albino mice using two cytogenetic endpoints for assessing its genotoxic and clastogenic potentials. Concentrations of 0.75, 1.5, 3.0, and 5.0 mg/kg b.w. were administered orally for the study of sister chromatid exchange frequencies and chromosome aberrations (CA). SCE frequencies showed a positive dose response; 1.5 mg/kg being the minimum effective concentration. Fen caused a prolongation of cell cycle at all concentrations. Except for the minimum therapeutic dose (0.75 mg), all other doses (1.5, 3.0, and 5.0 mg) showed a significant increase in the percentage of damaged cells over that of the vehicle control. The degree of clastogenicity was directly proportional to the dosage used and inversely related with the duration of treatment. A gradual reduction of the clastogenic potential was observed after 12 and 24 hr of exposure, indicating that the maximum effect occurs at the middle or late synthetic phase of the cell cycle. This study, probably the first detailed screening of the drug for its genotoxicity, shows that Fen is moderately clastogenic and a DNA damaging agent in vivo.

Administration, Oral↗
PubMed1992

Lymphoblastoid cell adhesion mediated by a dimeric and polymeric endogenous beta-galactoside-binding lectin (galaptin).

Glutaraldehyde-polymerized human splenic galaptin, a beta-galactoside-binding lectin, was demonstrated to have enhanced hemagglutinating and asialofetuin binding activity relative to native dimeric galaptin when these lectins were present in solution. The polymerized lectin consisted primarily of 2-, 4- and 12-membered species after reductive alkylation. Both forms of galaptin bound, at 4 degrees C, to saturable B lymphoblastoid cell surface receptors. Estimates obtained by Scatchard analyses, with the binding data expressed in terms of 14.5 kDa subunit molarity, were 5 x 10(7) binding sites/cell with affinity constant Ka = 2.2 x 10(5) M for dimeric galaptin and 17 x 10(7) binding sites/cell with Ka = 3.4 x 10(5) M-1 for polymeric galaptin. Both forms of galaptin adsorbed to polystyrene with high efficiency; however, only plastic-adsorbed polymeric galaptin mediated adhesion of lymphoblastoid cells. Cell adhesion was inhibited by lactose. Plastic-adsorbed polymeric galaptin bound asialofetuin more efficiently than dimeric galaptin. Asialofetuin binding was inhibited 65% and 30-50% by lactose for plastic-adsorbed polymeric and dimeric galaptin, respectively. Native fetuin bound to the adsorbed dimeric galaptin in a lactose-insensitive manner. These data indicate that cell surface receptor-galaptin interaction is carbohydrate specific whereas polystyrene-adsorbed galaptin may demonstrate protein-protein interactions with soluble ligands.

Asialoglycoproteins↗
PubMed1992

Interaction between two group IV metals--lead and zirconium--in bone marrow cells of Mus musculus in vivo.

The interaction between two group IV metals, the highly toxic lead and the relatively inactive and low toxic zirconium, was studied in the bone marrow chromosomes of Mus musculus in vivo. Low and high doses of zirconium oxychloride were fed orally to the experimental mice (i) 2 h before, (ii) 2 h after or (iii) together with different doses of lead nitrate. Protection against lead-induced clastogenicity was observed only when the lower dose of zirconium was administered prior to lead. All other combinations gave an additive or synergistic effect as was seen by significant increases in the frequencies of chromosomal aberrations.

Animals↗
PubMed1992

Comparison of the clastogenic effects of antimony trioxide on mice in vivo following acute and chronic exposure.

Antimony trioxide (Sb2O3), in aqueous suspension, was administered by gavaging to mice and monitored for chromosomal aberrations in bone marrow and sperm head abnormalities in germ cells. Acute exposure to the doses followed by observations after 6, 12, 18 and 24 h did not show any clastogenic effects. Chronic exposure daily to different doses for periods up to 21 days induced chromosomal aberrations in bone marrow. The frequencies were dose-dependent to a significant extent but no relationship could be seen with the sex of the animal. The findings indicate the harmful effects of cumulative exposure for prolonged periods to Sb2O3, which is being increasingly used in various industries.

Administration, Oral↗
PubMed1992

Effect of domestic processing, cooking and germination on the trypsin inhibitor activity and tannin content of faba bean (Vicia faba).

The effects of domestic processing methods like soaking for 12 h, dehulling, ordinary cooking of whole as well as dehulled seeds at 15 lbs/inch2 pressure for 15 and 25 min, and germination for 24, 36 and 48 h were observed on trypsin inhibitor (TIA) and tannin content of two varieties of faba bean viz. VH-131 and WF. A non-significant reduction in TIA was observed on soaking and dehulling, while tannins showed a reduction of 42 and 51% on soaking in VH 131 and WF, respectively. Dehulled seeds showed a decline in tannin content by 70 to 73% in two varieties. There was a significant reduction in TIA (75-76 per cent) and tannin (76-81%) on cooking, while autoclaving for 25 min almost completely eliminated both of these stress factors. Germination of seeds for 48 h led to a reduction of 64-65% in TIA and 90-91% in tannins, which was more than germination for 24 and 36 h. Soaked seeds gave positive results of both these antinutrients.

Fabaceae↗
PubMed1992

Modifying effect of iron on lead-induced clastogenicity in mouse bone marrow cells.

Essential trace elements such as iron (Fe) are known to interact with nonessential metals like lead (Pb), influencing its metabolism. Ferric chloride and lead nitrate were administered intraperitoneally to Swiss albino mice Mus musculus singly and successively, with or without a time gap of 1 h, to study the degree of protection, if any, afforded by iron against the clastogenic effects induced by Pb in bone marrow cells. A decrease in the frequency of lead-induced chromosomal aberrations was observed when Fe was given together with or prior to Pb administration.

Animals↗
PubMed1992

Zirconium. An abnormal trace element in biology.

The action of Zirconium (Zr) on biological systems presents an enigma. It is ubiquitous, being present in nature in amounts higher than most trace elements. It is taken up by plants from soil and water and accumulated in certain tissues. The entry into animal systems in vivo is related to the mode of exposure and the concentration in the surrounding environment. Retention is initially in soft tissues and then slowly in the bone. The metal is able to cross the blood brain-barrier and is deposited in the brain and the placental barrier to enter milk. The daily human uptake has been known to be as high as 125 mg. The level of toxicity has been found to be moderately low, both in histological and cytological studies. The toxic effects induced by very high concentrations are nonspecific in nature. Despite the presence and retention in relatively high quantities in biological systems, Zr has not yet been associated with any specific metabolic function. Very little information is available about its interaction with the compounds of the genetical systems, such as nucleic acids. Apparently, the metal is neither an essential nor toxic element in the conventional sense. However, the increasing exposure to this element through its increasing use in new materials and following radioactive fallout, has increased the importance of the study of its effects on living organisms. The tetravalent nature of the ionic state and the high stability of the compounds formed are important factors that need to be considered, as also the accumulation of this element in the brain, reminiscent of the relationship between Al3+ and Alzheimer's disease.

Animals↗
PubMed1992

Treatment of edentulous maxillae with osseointegrated implants.

Edentulous maxillae can be restored with implant supported fixed restorations containing denture teeth on a metal framework, implant-retained removable overlay prostheses, or porcelain fused-to-metal fixed prostheses. Esthetics and hygiene access are two important factors in determining the restoration best suited for each patient. Treatment planning considerations and treatment procedures for the various techniques are discussed.

Dental Implants↗