全文获取类型
收费全文 | 49110篇 |
免费 | 4630篇 |
国内免费 | 2150篇 |
专业分类
耳鼻咽喉 | 443篇 |
儿科学 | 842篇 |
妇产科学 | 694篇 |
基础医学 | 5322篇 |
口腔科学 | 1503篇 |
临床医学 | 5120篇 |
内科学 | 8731篇 |
皮肤病学 | 750篇 |
神经病学 | 2960篇 |
特种医学 | 1503篇 |
外国民族医学 | 9篇 |
外科学 | 5273篇 |
综合类 | 6579篇 |
现状与发展 | 12篇 |
一般理论 | 14篇 |
预防医学 | 3870篇 |
眼科学 | 1292篇 |
药学 | 4676篇 |
55篇 | |
中国医学 | 2876篇 |
肿瘤学 | 3366篇 |
出版年
2024年 | 179篇 |
2023年 | 716篇 |
2022年 | 1761篇 |
2021年 | 2748篇 |
2020年 | 1939篇 |
2019年 | 1624篇 |
2018年 | 1787篇 |
2017年 | 1606篇 |
2016年 | 1470篇 |
2015年 | 2102篇 |
2014年 | 2564篇 |
2013年 | 2891篇 |
2012年 | 4150篇 |
2011年 | 4460篇 |
2010年 | 2875篇 |
2009年 | 2460篇 |
2008年 | 3165篇 |
2007年 | 3044篇 |
2006年 | 2813篇 |
2005年 | 2397篇 |
2004年 | 1951篇 |
2003年 | 1811篇 |
2002年 | 1655篇 |
2001年 | 625篇 |
2000年 | 431篇 |
1999年 | 410篇 |
1998年 | 309篇 |
1997年 | 233篇 |
1996年 | 191篇 |
1995年 | 193篇 |
1994年 | 194篇 |
1993年 | 143篇 |
1992年 | 93篇 |
1991年 | 88篇 |
1990年 | 71篇 |
1989年 | 55篇 |
1988年 | 52篇 |
1987年 | 60篇 |
1986年 | 45篇 |
1985年 | 50篇 |
1984年 | 52篇 |
1983年 | 37篇 |
1982年 | 41篇 |
1981年 | 58篇 |
1980年 | 23篇 |
1979年 | 29篇 |
1978年 | 33篇 |
1977年 | 26篇 |
1976年 | 30篇 |
1973年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 437 毫秒
31.
患者,女,57岁。躯干部白色丘疹3年。本例皮肤镜表现独特之处在偏振光浸润模式下与典型脂溢性角化病不同,由于色素减退,皮沟与皮嵴表现为浅褐色背景下放射状分布亮白色线状条纹,呈珊瑚样结构。 相似文献
32.
José Roberto Jurado Jorge Hernán Santos Nieto Jairo Ospina Gaitán Constanza Garzón Bonilla Ricardo Villarreal David Acevedo Laura Cabrera Luis Felipe Cabrera Mauricio Pedraza 《Arab Journal Of Gastroenterology》2021,22(2):170-173
Background and study aimsThe COVID-19 outbreak has reorganized surgical team conditions regarding endoscopy. The number of interventions has been reduced, the number of healthcare professionals must be limited, and both the patients and physicians are more protected than ever.Patients and MethodsIn the highest peak of contagion in Colombia, endoscopy, colonoscopy, and esophagogastroduodenoscopy were performed using a low-cost disposable device. A total of 1388 procedures were performed. Every patient was assessed for symptoms via a telephone call, at the health center, and after the procedure, following specific attention routes.ResultsAfter procedure follow-up, no positive cases of COVID-19 were noted.ConclusionThe methodology reduced the risk of infection during the COVID-19 pandemic. 相似文献
33.
34.
陶瑞卿 《四川生殖卫生学院学报》2006,(5):13-16,23
生殖健康是当今国际社会关注的重要问题,也为我国政府重视。本文通过对攀枝花市人口与计划生育技术服务工作分析,总结出该市生殖健康服务模式的主要内容,对正确认识和提高我国西部地区人口生殖健康会水平,稳定我国低生育率水平,实现优生优育,具有十分重要的现实意义。 相似文献
35.
钩虫病是小肠寄生虫病,常与上消化道病变并存,常规胃镜检查时发现十二指肠钩虫具有偶然性。本文在行胃镜检查的14 850例中检出十二指肠钩虫45例。提示医师在常规胃镜检查过程中,对十二指肠尤其降部应仔细观察,一旦发现寄生虫应及时取出化验确诊。 相似文献
36.
Jorge Cano Julián Campo Luis A Moreno Antonio Bascones 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2006,101(1):11-28
OBJECTIVE: Alveolar distraction is a relatively novel procedure by which alveolar bone and underlying mucosa are regenerated. The low predictability of other vertical or horizontal bone regeneration methods has increased interest in this promising technique. This article was designed to review published clinical and experimental results on alveolar distraction, including basic research in other disciplines (maxillofacial and orthopedic distraction) related to or with influence on alveolar distraction. STUDY DESIGN: A review of the international literature was performed to summarize results of clinical and experimental studies on alveolar distraction and on distraction at other anatomical sites that contribute important findings on tissue biology, molecular mechanisms, and other factors that influence and participate in the alveolar distraction process. RESULTS: Research into alveolar distraction has addressed the latency phase, distraction phase, and consolidation phase, yielding highly variable results. Little experimental research has been carried out on this procedure, and most publications are clinical studies with a short follow-up period. Published studies have reported a high rate of complications, attributable to our current lack of understanding of the process. CONCLUSIONS: Definitive conclusions on alveolar distraction are hampered by the lack of clinical and experimental studies to date. Greater knowledge of the factors that influence the distraction process will lead to a more predictable and efficacious distraction technique and a better distractor design. 相似文献
37.
对PET/CT检查的385例患者和169例健康体检者给予精心、科学的检查前、检查后护理,并注意自身的放射性防护。结果554例均检查顺利,医务人员近期血常规正常。 相似文献
38.
Alexander Stoff MD ; Angel A. Rivera PhD ; N. S. Banerjee PhD ; J. Michael Mathis PhD ; Antonio Espinosa-de-los-Monteros MD ; Long P. Le PhD ; Jorge I. De la Torre MD ; Luis O. Vasconez MD ; Thomas R. Broker PhD ; Dirk F. Richter MD ; Mariam A. Stoff-Khalili MD ; David T. Curiel MD PhD 《Wound repair and regeneration》2006,14(5):608-617
Genetically modified keratinocytes and fibroblasts are suitable for delivery of therapeutic genes capable of modifying the wound healing process. However, efficient gene delivery is a prerequisite for successful gene therapy of wounds. Whereas adenoviral vectors (Ads) exhibit superior levels of in vivo gene transfer, their transductional efficiency to cells resident within wounds may nonetheless be suboptimal, due to deficiency of the primary adenovirus receptor, coxsackie-adenovirus receptor (CAR). We explored CAR-independent transduction to fibroblasts and keratinocytes using a panel of CAR-independent fiber-modified Ads to determine enhancement of infectivity. These fiber-modified adenoviral vectors included Ad 3 knob (Ad5/3), canine Ad serotype 2 knob (Ad5CAV-2), RGD (Ad5.RGD), polylysine (Ad5.pK7), or both RGD and polylysine (Ad5.RGD.pK7). To evaluate whether transduction efficiencies of the fiber-modified adenoviral vectors correlated with the expression of their putative receptors on keratinocytes and fibroblasts, we analyzed the mRNA levels of CAR, alpha upsilon integrin, syndecan-1, and glypican-1 using quantitative polymerase chain reaction. Analysis of luciferase and green fluorescent protein transgene expression showed superior transduction efficiency of Ad5.pK7 in keratinocytes and Ad5.RGD.pK7 in fibroblasts. mRNA expression of alpha upsilon integrin, syndecan-1 and glypican-1 was significantly higher in primary fibroblasts than CAR. In keratinocytes, syndecan-1 expression was significantly higher than all the other receptors tested. Significant infectivity enhancement was achieved in keratinocytes and fibroblasts using fiber-modified adenoviral vectors. These strategies to enhance infectivity may help to achieve higher clinical efficacy of wound gene therapy. 相似文献
39.
40.