Results: 5032

Acute effect of parathion on the seminiferous epithelium of immature mice

Rev. chil. anat; 18 (1), 2000
En el presente se estudió el efecto tóxico para la esparmatogenesis, de una inyección única del agropesticida organofosforado parathion, administrada a ratones inmaduros. Animales de 7 días de edad fueron inyectados por vía intraperitoneal con 1/3 de la LD50. Fue medido el peso corporal y testicula...

Resistencia de especies de shigella a antimicrobianos de uso habitual en el Hospital Regional Temuco, Chile
Resistance of the shigella species to regular antibiotics in the Regional Hospital of Temuco, Chile

El Hospital Regional de Temuco realiza vigilancia permanente de susceptibilidad a antimicrobianos en shigella detectándose desde 1996 resistencia progresiva a cloranfenicol, droga de elección en el tratamiento empírico frente a la sospecha de shigellosis. Se estudiaron 200 cepas de shigella aisladas d...

Efecto de los proteoglicanos arteriales sobre la oxidación in vitro de LDL aislada de pacientes hipercolesterolémicos
Effect of arterial proteoglycans on in vitro oxidation of LDL isolated from hypercholesterolemic patients

Acta cient. venez; 51 (4), 2000
The interaction of LDL with extracellular matrix proteoglycan apparently contribute to the acumulation of apo B-lipoproteins in atherogenesis. Retention of LDL by intima proteoglycans appears to increase the residence time needed for their structural, hydrolytic and oxidative modification. If the rate of...

Alteraciones enzimáticas séricas en ratas tratadas con bisulfito de sodio
Changes in serum enzymes in rats treated with sodium bisulfite

Acta cient. venez; 51 (4), 2000
Inorganic sulphites are chemical compounds with antioxidative, antibacterial and antimycotic properties diffusely employed in agro-food and pharmaceutical industries. In spite of their continuous use there still are many questions regarding their safety, and their possible influence in several nutrients ...

Construction of a cassette for cloning and analysis of replicons

Acta cient. venez; 51 (1), 2000
The aim of this work was the construction of a cassette, i.e., a non-replicative molecule formed by linkage of an antibiotic resistance gene and a multiple cloning site. This cassette would allow the cloning and analysis of a wide range of replicons. The aac(6')-lc amikacin gene was isolated and ligated ...

Inhibition of vascular endothelial growth factor (VEGF) as a novel approach for cancer therapy

Medicina (B.Aires); 60 Suppl 2 (), 2000
Of the numerous growth factors and cytokines that have been shown to have angiogenic effects, vascular endothelial growth factor (VEGF), also known as vascular permeability factor (VPF), appears to be a key factor in pathological situations which involve neovascularization as well as enhanced vascular pe...

Lessons from tumor and immunocompetent cells. The quantitative engagement of ligand-receptor interactions modulates stop-and-go behavior as well as proliferation

Medicina (B.Aires); 60 Suppl 2 (), 2000
The four main cell functions, proliferation, apoptosis, differentiation and migration, are tightly regulated by external signals that initiate intracellular signal transduction pathways and determine the cellular behaviour. The concentration and composition of such external signals are at least important...

De qué es culpable el intercambiador Na+/H+ en cardiología?
[What is Na+/H+ exchanger guilty of in cardiology?]

Medicina (B.Aires); 60 (5 Pt 2), 2000

Cinética de citocinas y de anticuerpos en ratones resistentes y susceptibles a la infección por Cryptococcus neoformans

La criptococosis, micosis sistémica oportunista que afecta especialmente a individuos inmunocomprometidos, es causada por Cryptococcus neoformmans. Uno de los factores de virulencia de esta levadura es el polisacárido capsular (PSC), compuesto principalmente por el glucuronoxilomanano (GXM), antígeno ...

Endocarditis causada por stomatococcus mucilaginosus
Infective endocarditis by enterococcus mucilaginosus

Rev. chil. cardiol; 18 (4), 1999