全文获取类型
收费全文 | 74篇 |
免费 | 0篇 |
专业分类
废物处理 | 1篇 |
综合类 | 61篇 |
基础理论 | 5篇 |
污染及防治 | 5篇 |
评价与监测 | 2篇 |
出版年
2023年 | 1篇 |
2020年 | 1篇 |
2018年 | 5篇 |
2017年 | 1篇 |
2013年 | 1篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2009年 | 1篇 |
2007年 | 1篇 |
2004年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 3篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1990年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 3篇 |
1970年 | 1篇 |
1967年 | 2篇 |
1966年 | 4篇 |
1965年 | 3篇 |
1964年 | 1篇 |
1962年 | 7篇 |
1961年 | 4篇 |
1960年 | 2篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 3篇 |
1954年 | 3篇 |
1952年 | 1篇 |
1924年 | 1篇 |
排序方式: 共有74条查询结果,搜索用时 484 毫秒
21.
22.
23.
24.
25.
26.
27.
28.
29.
The neural mechanisms underlying cricket singing behavior have been the focus of several studies, but the central pattern
generator (CPG) for singing has not been localized conclusively. To test if the abdominal ganglia contribute to the singing
motor pattern and to analyze if parts of the singing CPG are located in these ganglia, we systematically truncated the abdominal
nerve cord of fictively singing crickets while recording the singing motor pattern from a front-wing nerve. Severing the connectives
anywhere between terminal ganglion and abdominal ganglion A3 did not preclude singing, although the motor pattern became more
variable and failure-prone as more ganglia were disconnected. Singing terminated immediately and permanently after transecting
the connectives between the metathoracic ganglion complex and the first unfused abdominal ganglion A3. The contribution of
abdominal ganglia for singing pattern generation was confirmed by intracellular interneuron recordings and current injections.
During fictive singing, an ascending interneuron with its soma and dendrite in A3 depolarized rhythmically. It spiked 10 ms
before the wing-opener activity and hyperpolarized in phase with the wing-closer activity. Depolarizing current injection
elicited rhythmic membrane potential oscillations and spike bursts that elicited additional syllables and reliably reset the
ongoing chirp rhythm. Our results disclose that the abdominal ganglion A3 is directly involved in generating the singing motor
pattern, whereas the more posterior ganglia seem to provide only stabilizing feedback to the CPG circuit. Localizing the singing
CPG in the anterior abdominal neuromeres now allows analyzing its circuitry at the level of identified interneurons in subsequent
studies. 相似文献
30.
Bernhard Kienzler Berthold Luckscheiter Stefan Wilhelm 《Waste management (New York, N.Y.)》2001,21(8):741-752
Results of leaching experiments using active and inactively simulated HLW glass in concentrated NaCl solution are described. Measured solution concentrations of glass components, fission products and actinides are compared with computed data. The computed pH value corresponds with the findings from experiments with inactively simulated glass samples. Moreover, the concentrations of silica and strontium can be described adequately by reaction path modelling. The computed U concentration is explained by the precipitation of schoepite or Na2U2O7. The computed Am concentration significantly exceeds the measured data. This may be attributed to sorption processes on corrosion products of the glass, which are relevant also for lanthanide elements under the conditions of the experiments. This hypothesis is tested by solid solution approaches and by computing sorption of Am onto SiO2 precipitates. 相似文献