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At least 343 records · Page 19Linked to original sources
PubMed2002

[The problem of environmental protection in scientific research and medical teaching in Wielkopolska in the years 1945-2000].

The article, using a selected region, Wielkopolska, as an example, answers the question in what way science and teaching have reacted to the influence of the problem of the natural environment and its protection on the lives and health of people and on the quality of life. A survey of environmental research and teaching covered the period 1945-2000. This fifty year period accepted by the authors of the article seems a sufficient basis on which to judge the quality of scientific trends connected with this topic. The Wielkopolska survey is discussed against the background of society's growing expectations, expressed in the postulates of environmental organizations and in the concepts of eco-development, preferred by many European and some Polish communities.

Conservation of Natural Resources↗
PubMed1982

Vicia cytogenetic tests for environmental mutagens. A report of the U.S. Environmental Protection Agency Gene-Tox Program.

Vicia root-tip mitotic and pollen mother-cell meiotic tests are two major kinds of cytogenetic tests for environmental mutagens. According to the present review, 81 of 85 earlier studies used mitotic tests to determine the frequencies of chromosome or chromatid aberrations and/or sister-chromatid exchange from root-tip meristematic cells; only 4 used meiotic tests to determine the frequencies of chromosome aberration from pollen mother cells. Treatment of root-tip meristem can be done by allowing the newly germinated roots to absorb the chemical mutagens from a water solution. Pollen mother cells can be treated by spraying the solution or pipetting the liquid over the flower buds. After an appropriate recovery time, the samples are fixed and stained, and the slides are prepared for metaphase or anaphase figures for scoring aberration frequencies. Slides for meiotic tests are prepared for metaphase I and/or Anaphase I stages for scoring chromosome aberration frequencies. Results of both cytogenetic tests should be expressed in terms of number of breaks per cell or per 100 cells. Test results of 76 chemicals from 32 classes in this review indicate that the Vicia root-tip mitotic test is reliable, efficient, and relatively inexpensive. These results also reveal that antibiotics are most frequently studied, followed by alkyl sulfones, pyrimidine, and purine derivatives. Of all the agents studied through root-tip mitotic tests, about 90% gave positive responses; antibiotics (phleomycin and bleomycin) had very high mutagenicity (less than 1 ppm gave positive response).

Chromosome Aberrations↗
PubMed1999

The influence of personal protection, environmental hygiene and exposure to pesticides on the health of immigrant farm workers in a desert country.

OBJECTIVES: Farm workers in developing countries tend not to use protective measures while handling pesticides. This study investigates the use of personal protection equipment and the practice of safety and hygiene procedures in the handling of pesticides in agriculture. METHODS: Through a multi-stage sampling technique, one-fifth of the farms in a region were selected and all the farm workers at these farms were included in the study. A comparison population matching in age, socio-economic status and stay in the region was selected. A specifically designed questionnaire was used to collect information on the use of protective measures and the practice of safety and hygiene during work and on the disposal of empty pesticide containers. Blood pressure and erythrocyte acetylcholinesterase (AChE) activity were measured in the exposed and the unexposed populations. RESULTS: Protective equipment was worn by a minority of farm workers - gloves, by 35%; work coveralls, by 36%; a scarf to cover the nose and mouth, by 39%; and shoes at work, by 79%. With regard to personal hygiene measures, 83% of the workers changed clothes after work and the same proportion took a shower after work; 63% and 46% drank and ate while at work respectively; and 11% used articles of domestic use in the preparation of pesticides on the farm. Most of the farm workers (96%) were asked to prepare pesticides for spraying by the foreman and 61% were asked to spray the pesticides on the crops. AChE activity was highly significantly depleted in the exposed population as compared with the unexposed population. CONCLUSIONS: AChE depletion was found to be negatively associated with the use of gloves, of work coveralls, and of a scarf to cover the nose and mouth and with the implementation of safety and hygiene procedures on the farm. AChE depletion was positively associated with the frequency of pesticide spraying.

Acetylcholinesterase↗