全文获取类型
收费全文 | 1148篇 |
免费 | 66篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 35篇 |
妇产科学 | 10篇 |
基础医学 | 131篇 |
口腔科学 | 25篇 |
临床医学 | 80篇 |
内科学 | 385篇 |
皮肤病学 | 34篇 |
神经病学 | 38篇 |
特种医学 | 247篇 |
外科学 | 76篇 |
综合类 | 41篇 |
预防医学 | 31篇 |
眼科学 | 20篇 |
药学 | 42篇 |
中国医学 | 1篇 |
肿瘤学 | 19篇 |
出版年
2021年 | 17篇 |
2020年 | 15篇 |
2019年 | 23篇 |
2018年 | 29篇 |
2017年 | 19篇 |
2016年 | 15篇 |
2015年 | 27篇 |
2014年 | 18篇 |
2013年 | 42篇 |
2012年 | 32篇 |
2011年 | 50篇 |
2010年 | 30篇 |
2009年 | 24篇 |
2008年 | 41篇 |
2007年 | 38篇 |
2006年 | 34篇 |
2005年 | 52篇 |
2004年 | 32篇 |
2003年 | 39篇 |
2002年 | 34篇 |
2001年 | 33篇 |
2000年 | 23篇 |
1999年 | 25篇 |
1998年 | 25篇 |
1997年 | 40篇 |
1996年 | 30篇 |
1995年 | 22篇 |
1994年 | 21篇 |
1993年 | 17篇 |
1992年 | 23篇 |
1991年 | 14篇 |
1990年 | 11篇 |
1989年 | 16篇 |
1988年 | 23篇 |
1987年 | 32篇 |
1986年 | 28篇 |
1985年 | 19篇 |
1984年 | 17篇 |
1983年 | 10篇 |
1982年 | 16篇 |
1981年 | 19篇 |
1980年 | 16篇 |
1978年 | 10篇 |
1977年 | 9篇 |
1976年 | 9篇 |
1975年 | 14篇 |
1973年 | 9篇 |
1971年 | 11篇 |
1970年 | 10篇 |
1968年 | 8篇 |
排序方式: 共有1218条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Cholecystokinin-decreased food intake in rhesus monkeys 总被引:1,自引:0,他引:1
6.
This study analyses the influence of female and male patient age and human
menopausal gonadotrophin (HMG) requirements on clinical pregnancy rates and
live birth rates with ovulation stimulation using HMG in combination with
intrauterine insemination (IUI). In this study, 363 consecutive HMG/IUI
treatment cycles in 184 patients carried out at a university fertility
centre were analysed in a retrospective fashion. The main outcomes measured
were clinical pregnancy rates and live birth rates. Increased female
partner age (> or = 35) and male partner age (> or = 40) were found
to negatively influence pregnancy rates with HMG/ IUI therapy. In addition,
this study demonstrated a critical threshold of HMG requirements beyond
which pregnancy did not occur. No pregnancies occurred in treatment cycles
requiring > 25 ampoules (1875 IU) of menotrophins to achieve follicular
maturity, irrespective of patient age. In conclusion, female partner age,
male partner age, and HMG requirements all significantly influence
pregnancy rates with HMG/IUI therapy.
相似文献
7.
Adrenergic mechanisms in cerebral circulation of the goat 总被引:1,自引:0,他引:1
8.
The DQA gene of the rabbit major histocompatibility complex (MHC, RLA) is highly polymorphic and, in contrast to those reported for other mammalian species, is present as a single copy. These properties allow use of this gene in a method to type the class II locus of RLA by a combination of single-stranded conformational polymorphism (SSCP) and heteroduplex (HD) analysis. Familial segregation of RLA-DQA was shown and RLA class II types for rabbits of unknown pedigree were determined using migration patterns of amplified genomic DNA. Typing results were confirmed in experiments where unknown samples were mixed with products from rabbits of RLA types defined by sequence analysis. These analyses detected an RLA-DQA allele in addition to the five previously described; this new allele is designated RLA-DQA-F. 相似文献
9.
10.
Paramagnetic macrocyclic chelates show promise as magnetic resonance (MR) imaging contrast agents due to stability and relaxivity comparable to those of DTPA-type chelates. For the three copper and manganese macrocyclic complexes studied in aqueous solution, T1 and T2 relaxivities ranged from 0.14 to 5.88 mM-1sec-1 at 6.25 MHz. In rats, the intravenous administration of 16 mumol/kg of Mn(cyclam) caused the liver T1 relaxation rate to double at 15 minutes after injection. T1 measurements by pulsed MR imaging and manganese analyses on excised tissue showed that both relaxation rate (1/T1) and manganese content of liver and kidney increase linearly with the dosage of Mn(cyclam). The linear relationship between 1/T1 and manganese content can be considered an "in tissue" relaxivity plot for the agent. The resulting relaxivity is 54 mM-1sec-1 in liver, compared with 3.1 mM-1sec-1 in aqueous solution. Although this work is preliminary, the implication for medical MR imaging applications is that macrocyclic contrast agents can be effective at approximately one-tenth the current typical dose used for gadolinium DTPA. 相似文献