منابع مشابه
Trends in the sex ratio of California births, 1960-1996.
STUDY OBJECTIVE The male sex ratio at birth (or the proportion of male births in a population) has been suggested as a sentinel environmental health indicator. Usually around 51%, the proportion may be dramatically decreased in offspring of persons with chemical exposures. Recent publications from the USA and elsewhere have noted a small but apparently declining male birth proportion, suggestin...
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the discovery of antitoxins (von Behring and Kitasato), the standardization of toxins and anti-toxins, the distinction between active and passive immunization (Ehrlich), bacteriolysis (Pfeiffer), haemolysis, agglutination of blood corpuscles as a diagnostic test, the opsonic index, and prophylaxis and treatment of many diseases by vaccines. In certain diseases, for example, cerebro-spinal menin...
متن کاملRethinking the Area Approach in an Open Economy: Immigrants in California, 1960-2005
We show that a production-function-based approach with skill differentiation and integrated national markets has predictions for the employment effect of immigrants at the local level. The model predicts that if we look at the employment (rather than wage) response by skill to immigration in a state, we can estimate the substitutability-complementarity between natives and immigrants. This allow...
متن کاملechinococcosis: an occupational disease
hydatidosis is a common infestation caused by echinococcus spp. solitary hydatid cyst of the lung is not uncommon but coexistence of two or more pulmonary cysts are less common. these cysts may drain into the bronchial tree or very rarely into the pleural cavity which causes a poor outcome. certain people such as slaughters, tanners, stockbreeders, shepherds, butchers, veterinarians and all who...
متن کاملOccupational skin disease.
It is opportune to discuss occupational skin disorders since recently a 'Save your Skin' Campaign has been undertaken in the United Kingdom by the Employment Advisory Service of the Health and Safety Executive to increase the awareness of employers and employees of the need to prevent skin problems in industry.' This was justified because skin disorders caused by substances at work are the most...
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ژورنال
عنوان ژورنال: Occupational and Environmental Medicine
سال: 1963
ISSN: 1351-0711
DOI: 10.1136/oem.20.2.166-a