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31.
32.
The fusion of male- and female-derived gametes initiates the phenomenal process of producing a highly complex mammalian organism. Successful reproduction is so important that mammals invoke a battery of protective mechanisms for the germ cell lineages that function to maximize genetic integrity while still allowing genetic diversity and adaptation. Protective mechanisms likely include, but are not limited to, robust DNA repair to safeguard genetic integrity and apoptosis to remove cells with intolerable levels of DNA damage. Analyses of spontaneous mutant frequencies are generally consistent with germline DNA being stringently maintained relative to somatic tissues. Despite the rigorous protection afforded germ cells, genetic integrity is observed to decline with increased maternal and paternal age. It is not yet clear whether cells in the germ line truly age or whether other processes decline or become dysfunctional with age. For example, in a younger animal, the differentiation and/or utilization of germ cells with lower genetic integrity might be disallowed, whereas in an older animal, such cells might slip past these quality-control mechanisms. 相似文献
33.
Ellen Laan Ph.D. Louise Beekman Walter Everaerd Ph.D Leonore Tiefer Ph.D. Simon Gregson Joshua Ndlovu 《Journal of sex research》2013,50(2):179-181
Relatively little attention has been paid to the use and importance of labels used by men who have sex with men to describe insertive or receptive sexual behavior during intercourse. This study examines sexual self‐labels, sexual behavior, HIV transmission risk, and psychological functioning among 205 HIV‐seropositive men who have sex with men. The majority of participants (88%) identified as a “top, “ a “bottom, “ or “versatile. “ Tops were more likely to engage in insertive anal intercourse than bottoms, and bottoms were more likely to engage in receptive anal intercourse than tops, with versatiles reporting intermediate rates of both behaviors. Although the results suggest preliminary evidence regarding the predictive utility of self‐labels, sexual behaviors of self‐label groups were greatly overlapping. Differences were found among self‐label groups in gay self‐identification, internalized homophobia, sexual sensation seeking, and anxiety. Results suggest an added value in assessing self‐labels in addition to asking about sexual behavior. 相似文献
34.
We critically examine the accepted notion that primary education is a legitimate and necessary function of the state. The
notion is based upon three tenets: 1) public education is a necessary condition for democracy, 2) the market will not provide
equal access and quality of education to all, and 3) education represents an external economy. Each tenet is addressed and
evaluated according to its merits. In doing so, we also contrast the fulfillment of the ends implicit in the tenets under
state and market provisions. We conclude that the state provision of primary education cannot be justified by these goals,
and that market provision is a preferable alternative.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
35.
36.
Walter L. Wallace 《The American Sociologist》1990,21(4):352-358
The idea of standardizing concepts in sociology is not new, but we have made little progress, despite the early hopes of such
theorists as Durkheim and Weber. This article refutes the arguments of some who contend that we do not need standard concepts,
we cannot make standard concepts, social phenomena are too complex and changeful, sociologists are too individualistic and
sociological concepts are too context-dependent. The author proposes that the American Sociological Association appoint a
Committee on Basic Sociological Concepts to investigate and recommend the official adoption of a basic conceptual language
in American sociology.
This paper is excerpted from a longer discussion first presented to a session on metatheory at the 1990 meetings of the American
Sociological Association, and forthcoming in a collection of papers from that session. 相似文献
37.
Walter L. Adamson 《Theory and Society》1989,18(1):125-142
38.
Dynamic Measures of Individual Deprivation 总被引:1,自引:0,他引:1
We introduce a one-parameter class of individual deprivation measures. Motivated by a suggestion of Runciman, we modify Yitzhaki’s index by multiplying it by a function that is interpreted as measuring the part of deprivation generated by an agent’s observation that others in his reference group move on to a higher level of income than himself. The parameter reflects the relative weight given to these dynamic considerations, and the standard Yitzhaki index is obtained as a special case. In addition, we characterize more general classes of measures that pay attention to this important dynamic aspect of deprivation. 相似文献
39.
40.
Keith J. Horvath Alex Iantaffi Rebecca Swinburne-Romine Walter Bockting 《Journal of homosexuality》2014,61(8):1117-1130
The aim of this study was to compare the mental health, substance use, and sexual risk behaviors of rural and non-rural transgender persons. Online banner advertisements were used to recruit 1,229 self-identified rural and non-rural transgender adults (18+ years) residing in the United States. Primary findings include significant differences in mental health between rural and non-rural transmen; relatively low levels of binge drinking across groups, although high levels of marijuana use; and high levels of unprotected sex among transwomen. The results confirm that mental and physical health services for transgender persons residing in rural areas are urgently needed. 相似文献