全文获取类型
收费全文 | 2907872篇 |
免费 | 244278篇 |
国内免费 | 12950篇 |
专业分类
耳鼻咽喉 | 40149篇 |
儿科学 | 91794篇 |
妇产科学 | 73082篇 |
基础医学 | 478895篇 |
口腔科学 | 78842篇 |
临床医学 | 260374篇 |
内科学 | 495836篇 |
皮肤病学 | 82668篇 |
神经病学 | 249600篇 |
特种医学 | 113476篇 |
外国民族医学 | 88篇 |
外科学 | 457116篇 |
综合类 | 88484篇 |
现状与发展 | 23篇 |
一般理论 | 2100篇 |
预防医学 | 249669篇 |
眼科学 | 66310篇 |
药学 | 196430篇 |
22篇 | |
中国医学 | 8686篇 |
肿瘤学 | 131456篇 |
出版年
2022年 | 23028篇 |
2021年 | 54782篇 |
2020年 | 34931篇 |
2019年 | 57942篇 |
2018年 | 70083篇 |
2017年 | 53246篇 |
2016年 | 58511篇 |
2015年 | 73262篇 |
2014年 | 107332篇 |
2013年 | 172382篇 |
2012年 | 75912篇 |
2011年 | 74291篇 |
2010年 | 112591篇 |
2009年 | 117932篇 |
2008年 | 61569篇 |
2007年 | 62409篇 |
2006年 | 73916篇 |
2005年 | 69594篇 |
2004年 | 71825篇 |
2003年 | 63070篇 |
2002年 | 53295篇 |
2001年 | 74214篇 |
2000年 | 66299篇 |
1999年 | 71772篇 |
1998年 | 61934篇 |
1997年 | 60417篇 |
1996年 | 58215篇 |
1995年 | 53686篇 |
1994年 | 47852篇 |
1993年 | 44810篇 |
1992年 | 47967篇 |
1991年 | 46324篇 |
1990年 | 43919篇 |
1989年 | 43928篇 |
1988年 | 40803篇 |
1987年 | 39960篇 |
1986年 | 38012篇 |
1985年 | 38888篇 |
1984年 | 38561篇 |
1983年 | 36099篇 |
1982年 | 38113篇 |
1981年 | 36352篇 |
1980年 | 34363篇 |
1979年 | 30952篇 |
1978年 | 29761篇 |
1977年 | 27762篇 |
1976年 | 25504篇 |
1975年 | 24165篇 |
1974年 | 23884篇 |
1973年 | 22663篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
J. M. Bourre M. Clement J. Chaudiere 《Molecular and chemical neuropathology / sponsored by the International Society for Neurochemistry and the World Federation of Neurology and research groups on neurochemistry and cerebrospinal fluid》1987,7(2):91-97
In the brain of quaking and shiverer mutants, vitamin E content was normal when related to both wet weight and dry weight. When related to lipid extract, phosphorus, and polyunsaturated fatty acids, vitamin E was slightly increased only in the quaking mutant. In the sciatic nerve from trembler mutants, vitamin E was 134% of control values in the dry material, but normal in relation to wet weight. It was 260% in the lipid extract and 716% based on phosphorus. In relation to total fatty acids, there was a threefold increase in trembler mutants. Interestingly, it was increased approximately three times when related to 18∶2 n?6, 20∶4 n?6, and 20∶5 n?3, and seven times when related to 22∶6 n?3. The fact that the amount of vitamin E in fresh weight was normal, suggests that vitamin E plays a role in some nonmembrane material, such as the extracellular matrix or the basal lamina. 相似文献
992.
993.
994.
995.
Normal seminal vesicles were studied histologically in 80, and by Feulgen’s cytophotometric method in 10 autopsied cases (males,
44–82 years of age). In every case large, hyperchromatic nuclei were found. By cytophotometry euploid polyploid atypia was
also shown in every case, which is characteristic of benign hormonal dysplasia. 相似文献
996.
The hepatotropic effect of nonsteroidal anti-inflammatory drugs (NSAID) such as indomethacin, voltaren, piroxicam, phenylbutazon, mefenamic acid was studied. It was found that according to their level of the pharmacological protection of the liver against tetrachlormethan these agents may be arranged in the following sequence: mefenamic acid, phenylbutazon, voltaren, piroxicam. The hepatoprotective effect of NSAID correlates with the antioxidant properties and fails to correlate with the antioxidant ones. The hepatotoxic effect of NSAID was determined by their ability to suppress synthesis of prostaglandins. 相似文献
997.
998.
Lester A. Klein 《Neurourology and urodynamics》1987,6(2):95-99
The trigone sensitivity test, a complementary test to cystometry, has been proposed as a method for distinguishing certain clinical disorders. Pressure is applied to the trigone region of the bladder by pulling upon a Foley catheter with the balloon inflated and the amount of force needed to induce an urge to void is recorded. Although the trigone sensitivity test has been proposed as a test of exteroceptive function, it is possible that deeper receptors, perhaps proprioceptors, are actually responsible for the awareness of the urge to void during the study. The present investigation compared the trigone sensitivity test with provoked detrusor contraction in 107 patients. The findings indicate that variations in the two responses occur independently of each other. It is concluded that different neural pathways are responsible for the two functions. The hypothesis that exteroceptive and not proprioceptive nerves are being measured during trigone sensitivity testing is supported by these findings. 相似文献
999.
N.B.SIMPSON 《The British journal of dermatology》1987,117(1):43-47
Sebum excretion rate was measured by a photometric technique. We demonstrated a high correlation between sebum excretion rates on the left and right sides of the upper back and between back and forehead skin. Sebum excretion rate measurements overlying an open comedone (blackhead) were significantly lower than those obtained from normal skin. This observation demonstrates a functional obstruction to the outflow of sebum and would suggest that the lack of involvement of open comedones in inflammatory acne is not because of the maintenance of a free flow of sebum. 相似文献
1000.