全文获取类型
收费全文 | 217篇 |
免费 | 30篇 |
出版年
2021年 | 4篇 |
2020年 | 3篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 13篇 |
2013年 | 13篇 |
2012年 | 13篇 |
2011年 | 9篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 8篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 8篇 |
1989年 | 3篇 |
1988年 | 7篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1984年 | 7篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1970年 | 5篇 |
1961年 | 2篇 |
1960年 | 2篇 |
1953年 | 4篇 |
1919年 | 1篇 |
1909年 | 1篇 |
1897年 | 1篇 |
1890年 | 1篇 |
1887年 | 1篇 |
排序方式: 共有247条查询结果,搜索用时 15 毫秒
231.
232.
233.
234.
235.
J B Silk 《Folia primatologica; international journal of primatology》1978,29(2):129-141
The patterns of food sharing among mother and infant chimpanzees at the Gombe National Park, Tanzania, are primarily influenced by the infants' ability to procure and process foods independently. Foods infants could find and process on their own were not shared by mothers as frequently as foods infants could not obtain independently. Temporal changes were observed in the patterns of interactions as infants matured. It is suggested that food sharing may be considered a behavioral strategy which facilitates the infant's transition from dependent suckling to independent foraging. 相似文献
236.
Joan B. Silk 《American journal of primatology》1987,12(4):479-495
Maternal condition during pregnancy is known to influence fetal viability. Recently, primatologists have suggested that certain characteristics of the fetus may influence maternal condition as well. For example, among captive pigtailed macaques (Macaca nemestrina) mothers of female infants may be at greater risk of injury during their pregnancies than mothers of male infants. Analysis of the rates of aggression, submission, competition, and wounding among free-ranging pregnant baboons (Papio cynocephalus) in Amboseli National Park generally fail to support these findings, but several other factors such as maternal dominance rank, environmental conditions during pregnancy, maternal parity, and fetal age correlate with aggression, submission, competition, and injuries sustained by pregnant female baboons. 相似文献
237.
238.
239.
Joan B. Silk 《American journal of primatology》1989,19(3):137-146
Captive bonnet macaques housed at the California Primate Research Center reproduce seasonally. The chances of producing surviving infants were substantially reduced among females who conceived at the peak of the mating season compared with females whose conceptions were more isolated in time. Primiparous females and low ranking females were most consistently affected by the extent of reproductive synchrony. Behavioral data suggest that harassment of conceiving and pregnant females may have contributed to the correlation between the extent of reproductive synchrony and infant mortality as the levels of aggression toward females were highest during the months in which conceptions were most common. 相似文献
240.
Induction of ceruloplasmin synthesis by copper 总被引:2,自引:0,他引:2
P F Evans GW MAJORS W E Cornatzer 《Biochemical and biophysical research communications》1970,41(5):1120-1125