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At least 1,711 records · Page 95Linked to original sources
PubMed1994

[The epidemiological transition in Latin America].

The changes in health conditions that have occurred in most of the countries of Latin America in the second half of the twentieth century are analyzed. "This paper analyzes the main mechanisms involved in the epidemiologic transition, which are: changes in risk factors, fertility decline and improvements in health care technology." The authors use a mortality profile ratio, obtained by dividing the mortality rate due to infectious and parasitic diseases over the mortality rate due to cardiovascular diseases and neoplasms, to analyze trends in 15 countries. "Three distinct groups can be recognized. Each of them represents a different transitional experience. Such experiences are discussed in detail, including a new 'protracted polarized model' of the epidemiologic transition, which characterizes several Latin American countries. Finally, evidence is provided to illustrate the relationship among economic development, fertility change, and mortality profiles." (SUMMARY IN ENG)

Birth Rate↗
PubMed2002

[Comparison of biotic index used in monitoring of 2 lotic systems in north-western Argentina].

Two lotic bodies located in a subtropical semi-arid region in north-western Argentina were studied: the Arias-Arenales and the Rosario rivers. Both rivers are located in Salta Province, and belong to the high basin of river Juramento, connected to the river Río de la Plata and the Atlantic Ocean. The study was conducted between March 1997 and March 1998. The region is known by its sustained economic development and one of the highest population growth rates in the country (4% per year). The objective of this work was the assessment of organic pollution spatial gradients in both rivers, as a function of the hydrological regime (a long period of drought from May to October and floodings the rest of the year). Three groups of biotic indices were applied to characterize the level of organic pollution and were based on planktonic microalgae to evaluate water quality. The relative performance of these indices was then compared for use to biomonitoring programs. The diversity indices: Shannon-Weaver and Whilm-Dorris were not highly sensible to detect moderate pollution. The saprobity indices (Pantle and Buck and Diatom Assemblage Index of Watanabe et al.), were useful to detect intermediate levels of organic load, but their sensitivity dropped at high pollution levels. The second index precisely discriminated the most deteriorated part of river Rosario, with values between 0.3-0.7 (extreme poli-saprobity). Raw sewage discharges along the most polluted sector of river Arias-Arenales were assigned a value between 10 and 11 in both periods of the hydrological regime. Both saprobity indices consider the same indicator pollution value of species. The first one is based on the relative abundance of the species while the second one is calculated with the species relative frequency. The second index is better than the first one in considering non-dominant species that were constant in each particular environmental condition. The principal component analysis allowed a representation of time and space pollution patterns and showed the specific microalgae assemblage for all the sampling stations and for both periods in the hydrological cycle. Only the latter proved to be fully useful and correct for the biological characterization of water quality system.

Animals↗
PubMed1974

Three views. (Planned parenthood).

"I have yet to find I person in the Federation who believes that planned parenthood alone will produce economic development and alone will reduce the birthrate. These might have been real arguments in 1963 or even 1968 but everyone has now had enough experience to recognize how complicated are the problems with which we deal. Could we not agree that there is no priority to be decided between human happiness and human survival - that individual and collective approaches support one another and that our organization is flexible enough to let every association decide to approach this question according to the circumstances in their country? I would plead that we bury this hatchet and get on with the tremendous common tasks we face for the rest of this decade."

International Agencies↗
PubMed1987

On the Malthusian theory of long swings.

"In the Essay on Population economic growth consists of alternating surges of population (during which real wages fall and the rate of profit rises) and capital (during which the reverse occurs). A series of temporary equilibria exists at which wages are maximal, the rate of profit minimal, and fully employed work-force in technically determined relation to fixed capital stock. Between these equilibria occur episodes of excess labour, below-maximum wages, above minimum profit-rate and capital accumulation. Malthus's 'ratios' presuppose a logarithmic production function that implies first, that the full-employment real wage will fall to subsistence; secondly, that the full-employment 'wages fund' is constant." (SUMMARY IN FRE)

Demography↗