全文获取类型
收费全文 | 327321篇 |
免费 | 31202篇 |
国内免费 | 23157篇 |
专业分类
耳鼻咽喉 | 2828篇 |
儿科学 | 3815篇 |
妇产科学 | 4028篇 |
基础医学 | 36146篇 |
口腔科学 | 5789篇 |
临床医学 | 44419篇 |
内科学 | 45083篇 |
皮肤病学 | 3356篇 |
神经病学 | 16171篇 |
特种医学 | 12177篇 |
外国民族医学 | 167篇 |
外科学 | 31702篇 |
综合类 | 60326篇 |
现状与发展 | 80篇 |
一般理论 | 24篇 |
预防医学 | 23327篇 |
眼科学 | 9142篇 |
药学 | 34885篇 |
313篇 | |
中国医学 | 21613篇 |
肿瘤学 | 26289篇 |
出版年
2024年 | 1178篇 |
2023年 | 5145篇 |
2022年 | 13419篇 |
2021年 | 16709篇 |
2020年 | 12960篇 |
2019年 | 10681篇 |
2018年 | 11162篇 |
2017年 | 10637篇 |
2016年 | 9686篇 |
2015年 | 14996篇 |
2014年 | 18364篇 |
2013年 | 17059篇 |
2012年 | 24509篇 |
2011年 | 27299篇 |
2010年 | 17763篇 |
2009年 | 14181篇 |
2008年 | 17722篇 |
2007年 | 17739篇 |
2006年 | 17314篇 |
2005年 | 16474篇 |
2004年 | 11512篇 |
2003年 | 11359篇 |
2002年 | 9571篇 |
2001年 | 8120篇 |
2000年 | 7509篇 |
1999年 | 7158篇 |
1998年 | 4380篇 |
1997年 | 4311篇 |
1996年 | 3379篇 |
1995年 | 3114篇 |
1994年 | 2587篇 |
1993年 | 1629篇 |
1992年 | 2154篇 |
1991年 | 1804篇 |
1990年 | 1490篇 |
1989年 | 1243篇 |
1988年 | 1133篇 |
1987年 | 1007篇 |
1986年 | 793篇 |
1985年 | 600篇 |
1984年 | 361篇 |
1983年 | 266篇 |
1982年 | 159篇 |
1981年 | 160篇 |
1980年 | 121篇 |
1979年 | 150篇 |
1978年 | 49篇 |
1977年 | 53篇 |
1975年 | 57篇 |
1974年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
目的由于卒中风险随着狭窄严重程度的增加而升高,因此认为颈内动脉(ICA)接近闭塞患者的卒中风险很高。在现有的随机试验中,还没有专门针对这种情况进行探讨,因此其处理尚存在争汶。方法:对相关文献进行系统评价。结果:对ICA接近闭塞患者的处理还存在争议:一些学者支持进行干预,而另一些学者则认为存在风险或没有益处而反对进行干预。在ICA接近闭塞的有症状患者中进行一项比较外科治疗与最佳内科治疗的多中心前瞻性随机试验似乎非常困难,因为这类研究需要大量的患者。尽管如此,基于目前的证据,似乎很难拒绝手术治疗。结论:由于目前对ICA接近闭塞患者的最佳处理方案仍存在着争议,因此需要前瞻性观察性研究以证实其在有症状和无症状人群中的患病率以及相关的卒中风险。基于目前的证据,大多数医疗中心选择手术治疗,但它相对干内科治疗的特粱尚右待证章. 相似文献
72.
医院档案综合管理的意义及对策 总被引:4,自引:0,他引:4
对我国医院目前档案管理的现状,档案信息资源在医院现代化建设中的作用以及实行医院档案综合管理的重要意义及对策进行了全面系统地分析,强调了实现医院档案规范化、科学化和现代化管理的重要性和紧迫性。 相似文献
73.
Lianjun Lu Jinling Wang Jianhua Qiu Weiguo Huang Shunli Liu Shengxi Wu 《中华耳鼻咽喉科杂志》2002,37(6):428-431
OBJECTIVE: To examine the distribution of rat facial motoneurons contributing different branches under normal situation and when nerve reinnervation occurred following facial nerve axotomy. METHODS: The normal distribution of motoneurons innervated both buccal and marginal mandibular branches and its reorganization after facial nerve reinnervation was observed using retrograde labeling with fluorescein. RESULTS: Under normal situation, the motoneurons contributing buccall and marginal mandibular branches were primarily distributed in the intermedial and lateral subnucleus in facial nucleus and almost completely overlapped. The two types labeled neurons organized closely, but there were no double-labeled neurons. Although the motoneurons contributing buccall and marginal mandibular branches were primarily overlapped 4 month post-anastomosis, the number of the labeled neurons obviously decreased and the organization got more scattered. There were 10% of buccall branches, 5% of marginal mandibular motoneurons in the dorsal subnuleus, 1% of buccall and 4% of marginal mandibular in dorsal ventral and medial subnucleus. The distribution pattern of the motoneurons 6 month post-anastomosis was similar to that of 4 month post-anastomosis, but the number of the labeled neurons increased, and there were 1%-2% double-labeled neurons. CONCLUSION: The distribution pattern of motoneurons innervated both buccal and marginal mandibular branches indicates that it should exist wide-spread communicating branches, and its reorganization after facial nerve reinnervation suggests that misdirected regeneration occurs among motoneurons innervating different branches. 相似文献
74.
The promoting effect of the Chinese medicinal herb, Wikstroemia chamaedaphne and Tung oil extracts (WC and HHPA) on carcinoma of uterine cervix induced by HSV-2 or MCA in mice was studied. The results showed that WC and HHPA extracts were not carcinogenic themselves. After carcinogen HSV-2 and MCA treatment, WC and HHPA were added separately. The inducing rates by HSV-2 increased from 7.4% to 21.1% and 26.3%, those by MCA increased from 56.5% to 82.8% and 84.4%. There was a significant difference between the combined groups and groups with HSV-2 or MCA only. The experimental results suggest that these two kinds of extracts play a promoting effect on carcinogenesis. The relation between the carcinogenesis of uterine cervix or nasopharynx and WC or HHPA extracts is discussed. 相似文献
75.
76.
77.
目的:研究成釉细胞瘤(AB)和牙源性角化囊肿(OKC)中c-mycmRNA的表达,探讨c-myc在AB和OKC中的发生、发展及其生物学意义。方法:使用原位杂交法检测54例AB、16例OKC和7例口腔正常黏膜(NOM)组织中c-mycmRNA的表达,并将AB按原发、复发、恶变分组,结果使用χ2检验进行统计分析。结果:AB、OKC及NOM组织中c-mycmRNA的阳性表达率分别为81.5%(44/54)、75.0%(12/16)和14.3%(1/7),3组比较有显著性差异(χ2=15.488,P<0.05)。原发组AB中c-mycmRNA的阳性表达率为71.0%,复发组为94.7%,恶变组为100.0%,伴随原发、复发、恶变,差异有显著性(χ2=16.912,P﹤0.05)。结论:c-myc表达在AB的发生、发展中有重要作用;c-mycmRNA的表达与AB的临床生物学行为有关,伴随其生物学行为变化,c-mycmRNA表达增强;提示c-myc有可能成为评价预后的有效指标。 相似文献
78.
Yusen Chen Jun Nakura Jing-Ji Jin Zhihong Wu Miyuki Yamamoto Michiko Abe Yasuharu Tabara Yoshikuni Yamamoto Michiya Igase Xiao Bo Katsuhiko Kohara Tetsuro Miki 《Hypertension research》2003,26(6):439-444
The beta-adrenoceptor (beta-AR)-stimulatory guanine nucleotide-binding (Gs) protein system has been shown to play important roles in the cardiovascular system. The gene encoding the alpha-subunit of Gs proteins (GNAS1) is a candidate genetic determinant for hypertension. Because alcohol consumption is known to affect blood pressure partly through the beta-AR-Gs protein system, we examined the possible interaction between GNAS1 T393C polymorphism and drinking status in the association with hypertension in the present study. As a result, a non-significant but reasonable trend supporting the presence of an interaction was shown (p = 0.076). In line with this trend, the T393C polymorphism significantly interacted with drinking status in the association with systolic blood pressure (p = 0.028). Moreover, supporting the presence of an interaction, T allele carriers consistently had a higher probability of hypertension, higher systolic blood pressure, and higher diastolic blood pressure than CC homozygotes in non-drinkers and light drinkers. In contrast, CC homozygotes consistently had a higher probability of hypertension, higher systolic blood pressure, and higher diastolic blood pressure than T allele carriers in moderate to heavy drinkers. The present study also showed a significant interaction between the T393C polymorphism and drinking status in the association with pulse pressure (p = 0.026), reflected by a significant association between the T393C polymorphism and pulse pressure in moderate to heavy drinkers (p = 0.026). These findings may be helpful in conducting further molecular and biological studies on the relationship among the effects of alcohol, the beta-AR-Gs protein system, and hypertension. 相似文献
79.
80.
崩漏是月经周期、经期、经量严重失常的病证,是指经血非时暴下不止或淋漓不尽而言。调气活血汤为韩百灵氏治疗崩漏之经验方,韩氏认为本方证多由情志不遂,积思郁怒,或经产后,余血未尽,感寒涉水,过食生冷,不禁房事,余血停滞,瘀阻冲任,心血不得归经,而致崩中漏下。临证时须审因论治,若气病及血者,以活血为主,调气为辅。笔者自2005年以来,运用本方治疗妇女崩漏病34例,取得满意疗效,现报道如下。 相似文献