全文获取类型
收费全文 | 826篇 |
免费 | 20篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 11篇 |
妇产科学 | 2篇 |
基础医学 | 259篇 |
口腔科学 | 10篇 |
临床医学 | 71篇 |
内科学 | 86篇 |
皮肤病学 | 16篇 |
神经病学 | 16篇 |
特种医学 | 54篇 |
外科学 | 113篇 |
综合类 | 9篇 |
预防医学 | 53篇 |
眼科学 | 21篇 |
药学 | 60篇 |
中国医学 | 2篇 |
肿瘤学 | 31篇 |
出版年
2021年 | 14篇 |
2020年 | 8篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 13篇 |
2012年 | 21篇 |
2011年 | 23篇 |
2010年 | 20篇 |
2009年 | 14篇 |
2008年 | 12篇 |
2007年 | 33篇 |
2006年 | 23篇 |
2005年 | 12篇 |
2004年 | 17篇 |
2003年 | 13篇 |
2002年 | 27篇 |
2001年 | 26篇 |
2000年 | 34篇 |
1999年 | 21篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1994年 | 10篇 |
1992年 | 15篇 |
1991年 | 23篇 |
1990年 | 25篇 |
1989年 | 27篇 |
1988年 | 22篇 |
1987年 | 28篇 |
1986年 | 15篇 |
1985年 | 20篇 |
1984年 | 15篇 |
1983年 | 12篇 |
1982年 | 12篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 10篇 |
1978年 | 11篇 |
1977年 | 12篇 |
1976年 | 22篇 |
1975年 | 15篇 |
1974年 | 13篇 |
1973年 | 7篇 |
1972年 | 9篇 |
1971年 | 15篇 |
1970年 | 14篇 |
1969年 | 12篇 |
1968年 | 10篇 |
1966年 | 12篇 |
排序方式: 共有846条查询结果,搜索用时 31 毫秒
1.
2.
The synthesis of barbituric acid derivatives containing α-phenylskatyl residues substituted at C(5) is described. The initial compound was α-phenylnorgramine, which had been previously successfully used for the alkylation of a series of CH-acids, in particular, for the synthesis of diethyl-1H-indol-3-yl(phenyl)methylmalonate. This compound has been used to obtain a series of 2-thiobarbituric acid derivatives, which are expected to possess antioxidant, membrane protector, and radioprotector properties.__________Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 1, pp. 29 – 33, January, 2005. 相似文献
3.
Neuroimaging in Pineal Tumors 总被引:4,自引:0,他引:4
F Reis MD AV Faria MD PhD VA Zanardi MD PhD JR Menezes MD F Cendes MD PhD LS Queiroz MD PhD 《Journal of neuroimaging》2006,16(1):52-58
BACKGROUND AND PURPOSE: The authors report radiological findings in 11 tumors in the pineal region, which were histologically diagnosed as germinomas, pineocytomas pineoblastomas, ependymomas, teratomas, and astrocytomas. METHODS: Computed tomography (CT) was performed in seven patients and magnetic resonance imaging (MRI) was performed in all patients. RESULTS: CT showed a solid or solid/cystic mass with variable contrast enhancement. MRI showed a heterogeneous mass, with hypointense signal on T1 and iso/hyperintense signal on T2-weighted images (WI) and gadolinium enhancement. Extension to adjacent structures occurred in five patients and spread through the cerebral spinal fluid (CSF) in two. CONCLUSIONS: Pineal region tumors have no pathognomonic imaging pattern. MRI and CT are complementary in diagnosis and are important to determine localization, extension, and meningeal spread. 相似文献
4.
5.
The role of lymphokines was estimated in induction of autoreactive T-cells during Langat virus infection in mice. It was shown that in vitro cultured splenocytes from virus-infected animal containing autoreactive lymphocytes (ARL) spontaneously produce a lymphokine which is capable to activate the autoreactivity of lymphocytes derived from the spleen of intact syngeneic mice. The capacity of this lymphokine to activate the autoreactivity of acceptor cells within 2 hr was demonstrated by local graft-versus host reaction (GVHR) in the donor-recipient system. According to their surface markers (theta-antigen expression, absence of immunoglobulins) the lymphokine activating autoreactivity (LAA) producers may belong to T-lymphocyte population. Autoreactivity could be induced by the lymphokine only if the LAA producers and acceptors were compatible by the major histocompatibility complex antigens. 相似文献
6.
7.
8.
9.
10.
Moscow Automobile Roads Institute. All-Union Medical Instrumentation Research Institute, Moscow. Translated from Meditsinskaya
Tekhnika, No. 3, pp. 35–38, May–June, 1991. 相似文献