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Mostrando 25-36 de 36 artigos, teses e dissertações.
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25. Status-dependent selection in the dimorphic beetle Onthophagus taurus.
The occurrence of alternative reproductive phenotypes is widespread in most animal taxa. The majority of known examples best fit the notion of alternative tactics within a conditional strategy where the fitness pay-offs depend on an individual's competitive ability or status. Individuals are proposed as "choosing" the tactic that maximizes their fitness, giv
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26. Are urban safety-net hospitals losing low-risk Medicaid maternity patients?
OBJECTIVE: To examine data on Medicaid and self-pay/charity maternity cases to address four questions: (1) Did safety-net hospitals' share of Medicaid patients decline while their shares of self-pay/charity-care patients increased from 1991 to 1994? (2) Did Medicaid patients' propensity to use safety-net hospitals decline during 1991-94? (3) Did self-pay/cha
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27. Preventing Delirium at the End of Life: Lessons From Recent Research
Preservation of the ability to think clearly, in comfort, is a goal of end-of-life care. Recent research on delirium at the end of life suggests clinical strategies for prevention of cognitive impairment. Clinicians should consider early warnings of mild delirium such as impairment in attention and short-term memory by following the patient's ability to reme
Physicians Postgraduate Press.
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28. Aging mechanisms
Aging (senescence) has long been a difficult issue to be experimentally analyzed because of stochastic processes, which contrast with the programmed events during early development. However, we have recently started to learn the molecular mechanisms that control aging. Studies of the mutant mouse, klotho, showing premature aging, raise a possibility tha
The National Academy of Sciences.
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29. An instrumental variables approach to measuring the effect of body weight on employment disability.
OBJECTIVE: To measure the effect of body weight on employment disability. DATA SOURCES: Female respondents to the National Longitudinal Survey of Youth (NLSY), a nationally representative sample of American youth, surveyed from 1979 to 1998, merged with data from the child sample of the NLSY. STUDY DESIGN: A series of probit models and probit models with ins
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30. Racial/ethnic differences in health care utilization of cardiovascular procedures: a review of the evidence.
Studies based on a variety of primary data sets have consistently demonstrated that African Americans are about half as likely as whites to receive interventional therapy for coronary artery disease. Neither disease severity per se nor access to hospitals performing these procedures accounts for this finding. Likewise, available measures of income and abilit
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31. Demand for general practitioner and internist services.
Demand equations for general-practitioner and internist visits were estimated from 1970 CHAS-NORC survey data on health-service utilization and expenditure. Because a large proportion of respondents reported zero visits, observations were grouped according to cross-classified independent variables and regression analyses were performed using group means as d
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32. Low-birth-weight effects of demographic and socioeconomic variables and prenatal care in Pima County, Arizona.
Low birth weight is the major determinant of infant mortality. Continuing declines in infant mortality in the United States are due to the use of neonatal intensive care services; less progress has been made toward preventing low birth weight. I examined how the demographic, socioeconomic, and health services use variables affected rates of low birth weights
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33. Inhibition of Sendai virus genome replication due to promoter-increased selectivity: a possible role for the accessory C proteins.
The role of the negative-stranded virus accessory C proteins is difficult to assess because they appear sometimes as nonessential and thereby of no function. On the other hand, when a function is found, as in the case of Sendai virus, it represents an enigma, in that the C proteins inhibit replication under conditions where the infection follows an exponenti
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34. Dynamic, yet structured: The cell membrane three decades after the Singer–Nicolson model
The fluid mosaic membrane model proved to be a very useful hypothesis in explaining many, but certainly not all, phenomena taking place in biological membranes. New experimental data show that the compartmentalization of membrane components can be as important for effective signal transduction as is the fluidity of the membrane. In this work, we pay trib
National Academy of Sciences.
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35. Prostitution in Lagos: a sociomedical study.
A study of 150 hotel prostitutes in Lagos was undertaken to determine their socioeconomic identity and, through an assessment of their health knowledge, attitude, and practice, their probable impact on public health. The subjects were selected from 15 hotels, representing 20% of the estimated hotel universe in Lagos and different socioeconomic strata. Inform
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36. Regional and individual differences in physician practices for joint-ventured versus non-joint-ventured physicians.
OBJECTIVE. This article compares characteristics of physicians who have invested in health care business (joint ventures) to characteristics of physicians who have not, based on a survey of Florida physicians. DATA SOURCES/STUDY SETTING. In early 1990, a survey was mailed to a stratified random sample of 1,000 Florida physicians. Half were randomly selected