全文获取类型
收费全文 | 852篇 |
免费 | 14篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 4篇 |
妇产科学 | 4篇 |
基础医学 | 203篇 |
口腔科学 | 17篇 |
临床医学 | 133篇 |
内科学 | 180篇 |
皮肤病学 | 6篇 |
神经病学 | 34篇 |
特种医学 | 35篇 |
外科学 | 103篇 |
综合类 | 1篇 |
预防医学 | 52篇 |
眼科学 | 10篇 |
药学 | 37篇 |
中国医学 | 1篇 |
肿瘤学 | 41篇 |
出版年
2022年 | 11篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 8篇 |
2014年 | 10篇 |
2013年 | 7篇 |
2012年 | 27篇 |
2011年 | 25篇 |
2010年 | 17篇 |
2009年 | 7篇 |
2008年 | 26篇 |
2007年 | 32篇 |
2006年 | 33篇 |
2005年 | 27篇 |
2004年 | 35篇 |
2003年 | 36篇 |
2002年 | 30篇 |
2001年 | 19篇 |
2000年 | 24篇 |
1999年 | 16篇 |
1998年 | 7篇 |
1996年 | 6篇 |
1992年 | 19篇 |
1991年 | 22篇 |
1990年 | 27篇 |
1989年 | 27篇 |
1988年 | 23篇 |
1987年 | 46篇 |
1986年 | 30篇 |
1985年 | 25篇 |
1984年 | 18篇 |
1983年 | 9篇 |
1979年 | 16篇 |
1978年 | 11篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 11篇 |
1974年 | 9篇 |
1973年 | 12篇 |
1972年 | 12篇 |
1971年 | 11篇 |
1970年 | 6篇 |
1969年 | 8篇 |
1968年 | 10篇 |
1966年 | 6篇 |
1965年 | 6篇 |
排序方式: 共有866条查询结果,搜索用时 734 毫秒
61.
62.
63.
V P Strekalovski? A M Nikitin G I Ezhova V N Dem'ianov A V Kal'ianov 《Vestnik khirurgii imeni I. I. Grekova》1986,137(12):36-39
In patients with proliferative and mixed forms of total polyposis of the digestive tract the intestinal polyps are mainly localized in the duodenum, with hamartomal polyposis--in the jejunum and ileus. The endoscopic polypectomy from the small intestine may be performed intraoperatively and during endoscopy under narcosis. 174 polyps with the diameter of 0.5-5 cm were removed in 27 patients. There were 3 complications (bleedings) after polypectomy. 相似文献
64.
65.
66.
67.
A. V. Alesenko N. A. Babenko M. Yu. Pushkareva V. N. Nikitin 《Bulletin of experimental biology and medicine》1989,108(3):1246-1248
Institute of Chemical Physics, Academy of Sciences of the USSR, Moscow. A. M. Gor'kii Kharkov University. Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 108, No. 9, pp. 287–289, September, 1989. 相似文献
68.
Previously we showed that in snails that were conditioned for food aversion impairment of memory reconsolidation MK-801, an
antagonist of N-methyl-D-aspartate (NMDA) receptors, induced amnesia, at the early stage of which (<10 days) memory was restored
after repeated conditioning. In contrast, at the late stages (≥10 days) repeated training did not lead to memory restoration.
In the present study, we induced amnesia by MK-801/reminding in snails 24 h after taste aversion conditioning, and then tested
the effects of an agonist of NMDA receptors and a serotonin precursor 5-hydroxytryptophan (5-HTP) at the early (day 3) and
late (day 12) stages of amnesia. We found that NMDA injection and reminding by conditioned food stimulus 3 days after amnesia
induction did not lead to memory restoration. However, repeated conditioning 15 days after the amnesia induction led to the
restoration of memory. NMDA injection alone, not followed by reexposure, did not influence amnesia development. NMDA injection
combined with reminding 12 days after the amnesia induction, as well as 5-HTP injection combined with a reminding 3 days after
amnesia induction were ineffective, and a second conditioning did not result in the restoration of the memory. Thus, we have
demonstrated that NMDA receptor agonists have an antiamnestic effect only during the early phase of amnesia development, which
is caused by memory reconsolidation disruption, whereas the late phase of amnesia is insensitive to the agonists. 相似文献
69.
T D Dushina P N Nikitin V P Dremova V Ia Iakubovich N N Barinova L A Fedotova L A Borisova E I Zakharova T V Kochetova A B Iusipova 《Meditsinskaia parazitologiia i parazitarnye bolezni》1999,(1):15-20
Ixodes, persulcatus, I. ricinus, D. reticulatus, D. marginatus, H. concinna were recorded in different regional environmental regions. The northern districts of the region are endemic for tick-borne encephalitis (TBE) and Ixodes tick-borne borreliosis (ITBB). The infection of ticks with TBE virus is 0.25%, that with Borrelia is 10.3% of the total number of the examinees. In 1997 TBE and TTBB morbidity rates were 1.91 and 2.0 per 100,000, respectively. Data on the phenology of prevailing Anopheles messeae are given. Human malaria contamination may take 99-102 days (the first ten days of June to the second ten days of September). The large size of malaria mosquitoes and the presence of imported cases of malaria make it possible to deteriorate the malaria epidemiological situation. The larvicidal activity of a preparation derived from shepherd's-purse (Capsella bursa pastoris) [correction of caseweed (Bursae pastoris)] was tested. 80-85% deaths of larvae of second-third ages occurred 48 hours after treatment with the preparation, 1 kg/ha. 相似文献