全文获取类型
收费全文 | 41777篇 |
免费 | 3911篇 |
国内免费 | 1785篇 |
专业分类
耳鼻咽喉 | 379篇 |
儿科学 | 660篇 |
妇产科学 | 661篇 |
基础医学 | 6055篇 |
口腔科学 | 1151篇 |
临床医学 | 4237篇 |
内科学 | 7306篇 |
皮肤病学 | 675篇 |
神经病学 | 3288篇 |
特种医学 | 1622篇 |
外国民族医学 | 9篇 |
外科学 | 5151篇 |
综合类 | 4345篇 |
现状与发展 | 3篇 |
一般理论 | 9篇 |
预防医学 | 2579篇 |
眼科学 | 971篇 |
药学 | 4081篇 |
22篇 | |
中国医学 | 1092篇 |
肿瘤学 | 3177篇 |
出版年
2023年 | 259篇 |
2022年 | 648篇 |
2021年 | 1041篇 |
2020年 | 757篇 |
2019年 | 793篇 |
2018年 | 1104篇 |
2017年 | 958篇 |
2016年 | 865篇 |
2015年 | 1157篇 |
2014年 | 1406篇 |
2013年 | 1504篇 |
2012年 | 2170篇 |
2011年 | 2237篇 |
2010年 | 1394篇 |
2009年 | 1159篇 |
2008年 | 1751篇 |
2007年 | 1881篇 |
2006年 | 1743篇 |
2005年 | 1583篇 |
2004年 | 1285篇 |
2003年 | 1139篇 |
2002年 | 1000篇 |
2001年 | 2524篇 |
2000年 | 2443篇 |
1999年 | 2108篇 |
1998年 | 833篇 |
1997年 | 618篇 |
1996年 | 443篇 |
1995年 | 374篇 |
1994年 | 351篇 |
1993年 | 267篇 |
1992年 | 1066篇 |
1991年 | 957篇 |
1990年 | 866篇 |
1989年 | 935篇 |
1988年 | 831篇 |
1987年 | 764篇 |
1986年 | 719篇 |
1985年 | 637篇 |
1984年 | 390篇 |
1983年 | 325篇 |
1982年 | 188篇 |
1981年 | 144篇 |
1980年 | 117篇 |
1979年 | 205篇 |
1973年 | 93篇 |
1972年 | 92篇 |
1971年 | 94篇 |
1970年 | 83篇 |
1968年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Bipolar disorder (manic depressive disease) affects 1% of the United States population. These persons suffer from prolonged episodes of extreme elation and depression. There is a significant incidence of dental pathosis and a need for dental care among these patients. The medications used for the treatment of this disease, their physiologic effects, and their interactions with the drugs used in dentistry are reviewed. 相似文献
102.
103.
To establish the functional nature of the anatomically demonstrated main olfactory bulb inputs to the supraoptic nucleus, electrophysiological responses of intracellularly recorded supraoptic neurons to lateral olfactory tract stimulation were recorded in horizontal slices of basal forebrain and hypothalamus. A total of 71 synaptically influenced neurons were studied in slices from adult rats of both sexes. Of these, 60 cells (84%) were monosynaptically activated by olfactory tract stimulation; seven cells (10%) were activated via polysynaptic pathways; and four cells (6%) were characterized by long latency inhibitory responses. Lucifer Yellow was injected into 64 cells and subsequent immunocytochemical identification of 44 of these neurons showed that both oxytocin and vasopressin cells, in approximately equal numbers, were excited by olfactory stimulation. Polysynaptically mediated excitation, however, was only associated with oxytocin cells (six of the six identified cells). These results corroborate anatomical tract tracing data showing main olfactory bulb efferents to both supraotic neurons and to neurons of the perinuclear zone. Also supported are earlier speculations of olfactory participation in release of oxytocin and vasopressin during various physiological states. 相似文献
104.
105.
Leonora Q. Schwandt Henri-Jacques Tjong-Ayong Ranny van Weissenbruch Henny C. der Mei Frans W. J. Albers 《European archives of oto-rhino-laryngology》2006,263(6):518-523
Tracheoesophageal voice prostheses need to be replaced due to increased airflow resistance or retrograde leakage of fluid into the trachea as a consequence of biofilm formation. Previous in vitro studies show a change of aerodynamic features of biofilm covered voice prostheses after removal of the prostheses out of the patient. To assess these changes in an in situ situation, aerodynamic characteristics were measured within 45 patients at the beginning and at the end of the wearing process of the Provox 2 voice prosthesis. As a consequence, the influence of biofilm formation on aerodynamic characteristics can be evaluated. In the majority of cases, leakage through the prosthesis was the reason for replacement. No differences were found in the total flow, volume range and intratracheal pressure (ITP) of the voice prostheses measured. The airflow resistance of biofilm covered prostheses was significantly reduced compared to new clean prostheses. However, no correlation was found between the extent of biofilm and the different aerodynamic features measured. Biofilm formation on the Provox 2 is responsible for both reduction in airflow resistance and leakage through the prosthesis by deterioration of the silicone rubber material. 相似文献
106.
Lou Zhong-jin罗仲金 Wang Ling王玲 Liu Qing 刘庆Tian Guang-zhao田光兆 Hu Xiao-su胡孝素 Huang Guang-qi黄光琦Qian Fang钱方 Ran Rui-tu冉瑞图West China University of Medical Sciences ChengduHuang De-huai黄德淮Chengdu Fifth People''s Hospital Chengdu 《中华医学杂志(英文版)》1987,100(9):740-744
Comparative studies are made on the relative
percentages of amino acid content and LDH isozyme
by electrophoresis and Slab-PAGE in adult worms
of Ascaris lumbricoides, Ascaris suum and Toxocara
canis. The results show that there are remarkable
differences of Arg and His of 17 amino acids bet.
ween Toxocara canis and human intestinal ascaris,
human biliary ascaris and pig ascaris; there are also
obvious differences of band positions of LDH
isozyme electrophoretic patterns and band position
and amount of slab-PAGE patterns among them,
whereas no marked differences are found in these
three indices in human intestinal ascaris, human
biliary ascaris and pig ascaris. 相似文献
107.
108.
优选前后精子顶体酶活性与IVF受精率相关性的研究 总被引:1,自引:0,他引:1
目的探讨优选处理前和处理后精子顶体酶活性的变化,及与体外受精(IVF)受精率的相关性。方法采用分光光度比色法,对接受IVF治疗的53例不育夫妇男方精液,分别测定优选处理前和处理后精子顶体酶活性,分析其与IVF受精率的相关性。结果优选处理后精子顶体酶活性与优选前比较有显著性差异(P<0.05);达到常规IVF标准并选择常规IVF治疗者,优选后的精子顶体酶活性与IVF受精率有相关性,精子顶体酶活性降低与IVF受精率降低有关。结论精子顶体酶活性与IVF受精率有相关性,并且通过精子顶体酶活性可以预测IVF受精率。 相似文献
109.
110.