Melatonin: A Neurotrophic Factor?

Melatonin, -acetyl-5-hydroxytryptamine, is a hormone that synchronizes the internal environment with the photoperiod. It is synthesized in the pineal gland and greatly depends on the endogenous circadian clock located in the suprachiasmatic nucleus and the retina's exposure to different light intensities. Among its most studied functions are the regulation of the waking-sleep rhythm and body temperature.

The association between substance use and depressive symptomatology in nursing university students in Mexico.

The present study represents an ex post facto non-experimental study of undergraduate nursing students (N = 1,176) residing in Mexico whereby we examined the association between substance use and depressive symptomatology. The sample was composed primarily of women (70.1%), between the ages of 18 and 23 years (89.

Validity and Reliability of the Alcohol, Smoking, and Substance Involvement Screening Test (ASSIST) in University Students.

The Alcohol, Smoking and Substance Involvement Screening Test (ASSIST), developed by the World Health Organization (WHO), has been used successfully in many countries, but there are few studies of its validity and reliability for the Mexican population. The objective of this study was to determine the psychometric properties of the self-administered ASSIST test in university students in Mexico. This was an ex post facto non-experimental study with 1,176 undergraduate students, the majority women (70.

[Validation of a brief questionnaire to measure the risk of abnormal eating behaviors].

Objective: To assess the validity and reliability of a questionnaire for the screening of risk eating behaviors.

Material And Methods: The questionnaire was applied to female high school students in Mexico City in October 2002, as well as to a sample of eating disorder patients seen at the Eating Disorders Unit of the National Institute of Psychiatry between September and December 2002. Statistical methods included internal consistency analysis (Cronbach's alpha) and factor and principal component analysis with oblique rotation.