全文获取类型
收费全文 | 316篇 |
免费 | 34篇 |
国内免费 | 3篇 |
出版年
2023年 | 9篇 |
2022年 | 6篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 9篇 |
2017年 | 23篇 |
2016年 | 9篇 |
2015年 | 10篇 |
2014年 | 16篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 12篇 |
2010年 | 9篇 |
2009年 | 9篇 |
2008年 | 13篇 |
2007年 | 18篇 |
2006年 | 14篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 5篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 10篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 7篇 |
1981年 | 13篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 5篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有353条查询结果,搜索用时 93 毫秒
351.
Immunocytochemical staining of the neuropeptide somatostatin was evaluated in the brains of two growth hormone-deficient mouse mutants, Snell dwarf (dw/dw), and “little” (lit/lit). In Snell dwarf mice, in which GH is undetectable, an isolated somatostatin deficiency was observed in hypothalamic median eminence and in anterior periventricular hypothalamic neurons which are afferent to median eminence, compared to somatostatin staining in normal mice of the same strain (DW/?). Somatostatin staining in all other CNS areas in dwarfs was identical to that in normal mice. In contrast, in little mice, which exhibit 5–10% of normal GH levels, somatostatin expression was comparable between mutants and normal mice (LIT/?) in all CNS areas, including median eminence-afferent neurons in anterior periventricular hypothalamus. The results suggest that expression of somatostatin in hypophysiotropic CNS is dependent upon minimal pituitary GH secretion. 相似文献
352.
Kazuyuki Uchimura Hiroyuki Ai Kiyoaki Kuwasawa Tomoko Matsushita Makoto Kurokawa 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》2006,192(2):175-185
The frontal ganglion of the silkworm (Bombyx mori) gives rise to a visceral nerve, branches of which include a pair of anterior cardiac nerves and a pair of the posterior
cardiac nerves. Forward-fill of the visceral nerve with dextran labeled with tetramethyl rhodamine shows the anterior cardiac
nerves innervate the anterior region of the dorsal vessel. Back-fill of the anterior cardiac nerves with Co2+ and Ni2+ ions and the fluorescent dye reveals that the cell bodies of two motor neurons are located in the frontal ganglion. Injection
of 5, 6-carboxyfluorescein into the cell body of an identified motor neuron shows that the neuron gives rise to an axon running
to the visceral nerve. Unitary excitatory junctional potentials (EJPs) were recorded from a myocardial cell at the anterior
end of the heart. They responded in a one-to-one manner to electrical stimuli applied to the visceral nerve, or to impulses
generated by a depolarizing current injected into the cell body. EJPs induced by stimuli at higher than 0.5 Hz showed facilitation
while those induced at higher than 2 Hz showed summation. Individual EJPs without summation, or a train of EJPs with summation,
caused acceleration in the phase of posterograde heartbeat and heart reversal from anterograde heartbeat to posterograde heartbeat.
It is likely that the innervation of the anterior region of the dorsal vessel by the motor neurons, through the anterior cardiac
nerves is responsible for the control of heartbeat in Lepidoptera, at least in part. 相似文献
353.
Hiroshige Hibasami Takeshi Yoshida Tsuyoshi Totsuka Shinichiro Atsumi Kunio Nakashima 《生物化学与生物物理学报:疾病的分子基础》1994,1226(1):110-114
Extremely high activity of ornithine decarboxylase (ODC) was detected in the pituitary gland of growth- retarded mice, grm/grm at 2 months after birth. The elevated enzyme activity gradually decreased to the control level in 14 months after birth. In the pituitary gland of the growth-retarded mice, unusual chromophobic cells were also present from the early stages after birth. The chromophobic cells showed conspicuous proliferations and resulted in a distinct hyperplasia of the tissue after 4 months after birth. These findings suggest that OCD is correlated to the progressive transformation of pituitary cells into the chromophobic cells. 相似文献