全文获取类型
收费全文 | 175篇 |
免费 | 21篇 |
专业分类
196篇 |
出版年
2021年 | 2篇 |
2017年 | 2篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 4篇 |
2013年 | 2篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2007年 | 4篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 8篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 4篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 3篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1947年 | 1篇 |
1938年 | 1篇 |
1934年 | 1篇 |
排序方式: 共有196条查询结果,搜索用时 15 毫秒
191.
Niels Westergaard Arme Schousboe Niels Grunnet John Dich 《Neurochemical research》1989,14(12):1203-1207
A co-culture system of cerebellar granule cells (glutamatergic neurons) and hepatocytes has been developed. Petri dishes divided in halves by a temporary septum were coated with poly-L-lysine and cerebellar granule cells plated in one of the compartments. Five days later hepatocytes were plated in the other compartment and after 2 days the septum was removed and the two cell types shared the same culture medium for a period of 5 days. During this period of time cultures of neurons and hepatocytes kept separately or in co-culture exhibited identical characteristics with regard to activities of pyruvate kinase and glucokinase (hepatocytes), aspartate aminotransferase (neurons) as well as evoked transmitter release (neurons) and content of cytochrome P-450 (hepatocytes). The results show that it is possible to maintain neurons and hepatocytes in co-culture sharing the same culture medium for a prolonged period of time. Such a system may serve as a pharmacological model to study interactions between liver and brain cells with regard to neuroactive drugs. 相似文献
192.
This research examined the responses of bonobos (Pan paniscus) to their mirror images. Nine bonobos were presented alternately with the reflective and non-reflective sides of a mirror.
The apes exhibited considerable interest in the mirror, and immature animals exhibited higher frequencies of contingent action
and inactive looking than did adults. four animals used the mirror to inspect parts of their bodies that were otherwise not
visible to them, indicating that bonobos are capable of self-recognition. 相似文献
193.
194.
Gregory Charles Westergaard Stephen J. Suomi 《International journal of primatology》1997,18(3):455-467
We examined modification of clay forms by tufted capuchins (Cebus apella) by presenting groups of subjects with clay, paint, stones, leaves, and sticks. In Experiment 1, 7 of 10 subjects reshaped portable forms with their hands and with stones, and decorated them with leaves and paint. In Experiment 2, 9 subjects marked clay slabs manually and with stick and stone tools. The manipulative propensities of Cebus can help us to understand psychological processes that underlie artistic expression in Homo and Pan. 相似文献
195.
Gregory Charles Westergaard Stephen J. Suomi 《International journal of primatology》1994,15(4):521-529
We examined hand preference in the use of tools by tufted capuchins (Cebus apella). We presented a colony of monkeys with
an enclosed container designed to accommodate the use of probing tools. Over an 8-month period, 13 monkeys used probes to
extract sweet syrup from the narrow opening of the apparatus. Five monkeys exhibited bias toward use of their right hand and
eight monkeys exhibited bias toward use of their left hand. Adult monkeys exhibited a greater percentage of right-hand preferent
probing sequences than did juveniles. These results are consistent with hypotheses that in tasks that involve the use of tools,
nonhuman primates exhibit strong lateral asymmetries at the individual level, a moderate left-hand bias at the population
level, and increased bias with age toward use of the right hand. 相似文献
196.
The purpose of this study was to examine the hierarchical complexity of combinatorial manipulation in capuchin monkeys (Cebus apella). Two experiments were conducted. In Experiment 1 capuchins were presented with an apparatus designed to accommodate the use of probing tools. In Experiment 2 the same capuchins were presented with sets of nesting containers. Five of the ten subjects used probing tools and seven subjects placed objects in the containers. The capuchins' behavior reflected three hierarchically organized combinatorial patterns displayed by chimpanzees and human infants. Although the capuchins sometimes displayed the two more complex patterns (“pot” and “subassembly”), their combinatorial behavior was dominated by the simplest pattern (“pairing”). In this regard capuchins may not attain the same grammar of manipulative action that has been reported for chimpanzees and young human children. © 1994 Wiley-Liss, Inc. 相似文献