[Cluster sampling in health surveys].

Objective: Describing how the cluster sampling statistical technique can be applied to health surveys.

Methods: The article describes the most important aspects for each methodological step, emphasising cluster sampling's foundations. It was applied to a population of around 100,000 inhabitants from commune 18 in Cali.

Determination of biological and physicochemical parameters of Artemia franciscana strains in hypersaline environments for aquaculture in the Colombian Caribbean.

Background: Artemia (Crustacea, Anostraca), also known as brine shrimp, are typical inhabitants of extreme environments. These hypersaline environments vary considerably in their physicochemical composition, and even their climatic conditions and elevation. Several thalassohaline (marine) environments along the Colombian Caribbean coast were surveyed in order to contribute to the knowledge of brine shrimp biotopes in South America by determining some vital biological and physicochemical parameters for Artemia survival.

[Mesial temporal lobe epilepsy: its physiopathology, clinical characteristics, treatment and prognosis].

Introduction: The prevalence of epilepsy in the population is between 15 and 18 per 1000. About 60 to 80% of the people affected are considered to have an appropriate long term prognosis (from 5 to 10 years), while between 20 and 40% respond partially to pharmacological therapy. Temporal lobe epilepsy (TLE) is the main cause of refractory epilepsies and is associated to atrophy and sclerosis of the hippocampus.