首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   61840篇
  免费   5613篇
  国内免费   4046篇
耳鼻咽喉   519篇
儿科学   836篇
妇产科学   1224篇
基础医学   7731篇
口腔科学   976篇
临床医学   8802篇
内科学   9558篇
皮肤病学   712篇
神经病学   3650篇
特种医学   2300篇
外国民族医学   52篇
外科学   6172篇
综合类   8096篇
现状与发展   19篇
一般理论   3篇
预防医学   4179篇
眼科学   1672篇
药学   6363篇
  62篇
中国医学   3011篇
肿瘤学   5562篇
  2024年   182篇
  2023年   982篇
  2022年   2370篇
  2021年   3128篇
  2020年   2267篇
  2019年   2135篇
  2018年   2308篇
  2017年   1972篇
  2016年   1974篇
  2015年   2774篇
  2014年   3412篇
  2013年   2897篇
  2012年   4448篇
  2011年   4930篇
  2010年   3009篇
  2009年   2330篇
  2008年   3154篇
  2007年   3188篇
  2006年   3182篇
  2005年   3150篇
  2004年   2152篇
  2003年   2083篇
  2002年   1794篇
  2001年   1280篇
  2000年   1333篇
  1999年   1447篇
  1998年   974篇
  1997年   944篇
  1996年   726篇
  1995年   667篇
  1994年   548篇
  1993年   362篇
  1992年   445篇
  1991年   388篇
  1990年   356篇
  1989年   303篇
  1988年   308篇
  1987年   254篇
  1986年   242篇
  1985年   191篇
  1984年   137篇
  1983年   106篇
  1982年   63篇
  1981年   62篇
  1980年   45篇
  1979年   104篇
  1978年   45篇
  1977年   33篇
  1975年   49篇
  1974年   55篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
外伤性先兆性视网膜脱离的治疗   总被引:1,自引:0,他引:1  
  相似文献   
62.
对205例甲状腺手术进行分析,其发病情况与资料报道基本相符。各种并发症的发生率未超过1%,无手术死亡,术后无甲状腺危象发生,与60年代以前相比已大为降低。  相似文献   
63.
64.
65.
Intravaginal misoprostol has been shown to be effective forcervical priming before a surgically induced abortion. The objectivewas to investigate the effectiveness of oral misoprostol incervical dilatation prior to vacuum aspiration between the 6thand 12th weeks of pregnancy. The results showed that in nulliparouspatients, the median cervical dilatation in the treatment group(7.8 mm) was significantly greater than that in the placebogroup (3.7 mm). In multiparous patients, the difference wasalso statistically significant (9.8 versus 6.0 mm). The easeof dilatation, assessed subjectively by the operating surgeons,was significantly improved in the treatment group. There wasalso a significant reduction in the duration of the operationand in the mean blood loss in the treatment group. The side-effectsencountered in the treatment group were mild and well acceptedby the women. Oral misoprostol is an effective and safe methodfor cervical dilatation prior to vacuum aspiration in firsttrimester pregnancy.  相似文献   
66.
67.
Fifty-four kinds of crude drug derived from insects are listed in the "herbal" Jing-shi-zheng-lei-da-guang-ben-cao (1108 A.D.) edited during the Chinese Song dynasty (960-1280 A.D.). We considered each of them from the viewpoint of various herbals and have commented on them, the order being adhered to in most cases. We added our own findings of identification of insect crude drugs available on the market. The crude drugs emphasized are mantis egg case, wasp's nest, scarab larva, red cicada, snipe fly, horse fly, flying cockroach, Eupolyphaga, Chinese Cantharides and scarab beetle. Others are discussed to a lesser extent.  相似文献   
68.
B S Ma  N M Li  G R Wang 《中西医结合杂志》1989,9(10):583-6, 579
Based on the experience of the late Beijing traditional medicine professor Zhao Bingnan in treating acute infectious febrile disease and its complications, compound herbal drink composed of five kinds of shen. Six hundred cases of febrile disease with damage to Yin and reddened tongue syndrome and hypokalemia. Patients were randomly divided into groups I, II and control. The perspective study of treatment results and experiments were carried out. The results showed that group I and II who received the compound five-Shen herbal drink (CFSHD) showed good therapeutic effects, the rates of significant effectiveness were 65.5% and 73.1% respectively (P greater than 0.05). The total rates of effectiveness were 97.2% and 96.2% respectively. The rate of significant effectiveness of the control group was 11%, total rate of effectiveness was 43%. There was significant statistical difference between the control group and group I or II (P less than 0.001). Authors of present paper are the first to propose the "Reddened Tongue" to be the main diagnostic criterion of syndrome of "Damage both to the Qi and Yin". Laboratory examination of 344 cases of "Reddened Tongue" revealed that 317 cases with hypokalemia (blood potassium less than 3.5 mEq/L) were 92.15% of the entire group. The authors point out that most of the patients with "damage to both the Qi and Yin" besides hypokalemia can be also low in calcium, magnesium and trace elements. After treatment with CFSHD restoration of normal blood potassium was parallel with the improvement of the reddened tongue.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
69.
Fu SL  Ma ZW  Yin L  Iannotti C  Lu PH  Xu XM 《Neuroscience》2005,135(3):851-862
To determine whether neural precursor cells have region-specific growth properties, we compared the proliferation, mitogenicity, and differentiation of these cells isolated from the embryonic day 16 rat forebrain and spinal cord. Neural precursor cells isolated from both regions were cultured in growth medium supplemented with epidermal growth factor, basic fibroblast growth factor, or epidermal growth factor+basic fibroblast growth factor. Under all three conditions, both neural precursor cell populations proliferated for multiple passages. While spinal cord-derived neural precursor cells proliferated moderately faster in epidermal growth factor-enriched growth medium, brain-derived cells proliferated much faster in basic fibroblast growth factor-enriched growth medium. When exposed to both epidermal growth factor and basic fibroblast growth factor, the two neural precursor cell populations expanded and proliferated more rapidly than when exposed to a single factor, with brain-derived neural precursor cells expanding significantly faster than spinal cord-derived ones (P<0.0001). Differentiation studies showed that both neural precursor cell populations were multi-potent giving rise to neurons, astrocytes, and oligodendrocytes. However, neuronal differentiation from brain-derived neural precursor cells was greater than spinal cord-derived ones (11.95+/-5.00% vs 1.92+/-1.13%; passage 2). Further, the two neural precursor cell populations differentiated into a similar percentage of oligodendrocytes (brain: 8.66+/-5.85%; spinal cord: 7.69+/-3.91%; passage 2). Immunofluorescence and Western blot studies showed that neural precursor cells derived from both regions expressed receptors for basic fibroblast growth factor and epidermal growth factor. However, brain-derived neural precursor cells expressed higher levels of the two receptors than spinal cord-derived ones in growth medium containing epidermal growth factor+basic fibroblast growth factor. Thus, our results showed that neural precursor cells isolated from the two regions of the CNS have distinct properties and growth requirements. Identifying phenotypic differences between these neural precursor cell populations and their growth requirements should provide new insights into the development of cell therapies for region-specific neurological degenerative diseases.  相似文献   
70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号