全文获取类型
收费全文 | 11920篇 |
免费 | 849篇 |
国内免费 | 274篇 |
专业分类
耳鼻咽喉 | 170篇 |
儿科学 | 243篇 |
妇产科学 | 180篇 |
基础医学 | 298篇 |
口腔科学 | 162篇 |
临床医学 | 1442篇 |
内科学 | 1688篇 |
皮肤病学 | 66篇 |
神经病学 | 253篇 |
特种医学 | 2120篇 |
外国民族医学 | 2篇 |
外科学 | 2527篇 |
综合类 | 1724篇 |
预防医学 | 562篇 |
眼科学 | 192篇 |
药学 | 724篇 |
10篇 | |
中国医学 | 193篇 |
肿瘤学 | 487篇 |
出版年
2024年 | 21篇 |
2023年 | 200篇 |
2022年 | 300篇 |
2021年 | 432篇 |
2020年 | 439篇 |
2019年 | 349篇 |
2018年 | 355篇 |
2017年 | 305篇 |
2016年 | 401篇 |
2015年 | 365篇 |
2014年 | 715篇 |
2013年 | 665篇 |
2012年 | 629篇 |
2011年 | 776篇 |
2010年 | 671篇 |
2009年 | 739篇 |
2008年 | 670篇 |
2007年 | 759篇 |
2006年 | 667篇 |
2005年 | 620篇 |
2004年 | 509篇 |
2003年 | 426篇 |
2002年 | 369篇 |
2001年 | 297篇 |
2000年 | 227篇 |
1999年 | 207篇 |
1998年 | 163篇 |
1997年 | 129篇 |
1996年 | 104篇 |
1995年 | 77篇 |
1994年 | 81篇 |
1993年 | 48篇 |
1992年 | 43篇 |
1991年 | 36篇 |
1990年 | 28篇 |
1989年 | 29篇 |
1988年 | 19篇 |
1987年 | 17篇 |
1986年 | 18篇 |
1985年 | 28篇 |
1984年 | 25篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1981年 | 10篇 |
1980年 | 13篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 5篇 |
1973年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
目的:优选养血口服液提取工艺。方法:以干膏收率和总黄酮的含量为指标,采用正交试验法对养血口服液提取工艺进行研究。结果:确定最佳工艺条件为:水煎煮2次,第一次加10倍量水,煎煮1.5小时;第二次加8倍量水煎1,所得煎煮液浓缩至1ml,含1g生药,醇沉浓度为70%。结论:本法可用于养血口服液的生产。 相似文献
102.
103.
目的 探讨X线下用带膜支架治疗食管气管瘘的方法。方法 在X线监视下以导丝引导 ,用支架推送器将带膜食管支架送入患者有食管气管瘘的食道段内 ,达到堵瘘目的。结果 10例患者全部一次堵瘘成功 ,当天即可正常进食 ,无 1例出现严重并发症。结论 在X线下带膜支架治疗食管气管瘘是一种很好的方法。 相似文献
104.
目的 了解射频消融灶大小与功率及时间的关系、超声与大体病理测值的关系、消融灶与周围组织的关系。方法 新鲜牛肝 3只和牛肾 2只 ,消融灶分两组 :距肝表面 1cm和 4cm ;同时将肾脏置于肝表面 ,用不同的功率和时间实验。结果 10min时 ,2 0W ,40W ,6 0W ,80W的消融灶病理测值分别为 4.1cm ,3.8cm ,3.0cm ,3.3cm ,超声测值分别为 4.5cm ,4.0cm ,4.5cm ,4.0cm。 2 0min时 ,消融灶病理测值分别为 3.0cm ,4.1cm ,2 .8cm ,3.5cm ,超声测值分别为 4.3cm ,4.2cm ,3.4cm ,3.8cm。 30min时 ,消融灶病理测值分别为 3.5cm ,2 .9cm ,3.5cm ,3.4cm ,超声测值分别为 4.5cm ,4.0cm ,3.6cm ,4.1cm。超声和大体解剖测值相比 ,P <0 .0 1。消融灶和周围组织间有0 .3~ 0 .5cm的浅红色移行区。结论 射频消融灶的大小不随功率和时间的增加而增加 ,超声比大体病理测值大 ,两者差别有极显著性意义。消融病灶和周围组织间有移行区。浅表面的消融病灶对临近组织有损伤作用 相似文献
105.
N. M. Wilson G. B. Marks A. Eckhardt A. M. Clarke F. P. Young F. L. Garden W. Stewart T. M. Cook E. R. Tovey 《Anaesthesia》2021,76(11):1465-1474
Respirable aerosols (< 5 µm in diameter) present a high risk of SARS-CoV-2 transmission. Guidelines recommend using aerosol precautions during aerosol-generating procedures, and droplet (> 5 µm) precautions at other times. However, emerging evidence indicates respiratory activities may be a more important source of aerosols than clinical procedures such as tracheal intubation. We aimed to measure the size, total number and volume of all human aerosols exhaled during respiratory activities and therapies. We used a novel chamber with an optical particle counter sampling at 100 l.min-1 to count and size-fractionate close to all exhaled particles (0.5–25 µm). We compared emissions from ten healthy subjects during six respiratory activities (quiet breathing; talking; shouting; forced expiratory manoeuvres; exercise; and coughing) with three respiratory therapies (high-flow nasal oxygen and single or dual circuit non-invasive positive pressure ventilation). Activities were repeated while wearing facemasks. When compared with quiet breathing, exertional respiratory activities increased particle counts 34.6-fold during talking and 370.8-fold during coughing (p < 0.001). High-flow nasal oxygen 60 at l.min-1 increased particle counts 2.3-fold (p = 0.031) during quiet breathing. Single and dual circuit non-invasive respiratory therapy at 25/10 cm.H2O with quiet breathing increased counts by 2.6-fold and 7.8-fold, respectively (both p < 0.001). During exertional activities, respiratory therapies and facemasks reduced emissions compared with activities alone. Respiratory activities (including exertional breathing and coughing) which mimic respiratory patterns during illness generate substantially more aerosols than non-invasive respiratory therapies, which conversely can reduce total emissions. We argue the risk of aerosol exposure is underappreciated and warrants widespread, targeted interventions. 相似文献
106.
Carlos Jiménez Romero Laura Alonso Murillo Paula Rioja Conde Alberto Marcacuzco Quinto Óscar Caso Maestro Anisa Nutu Isabel Pérez Moreiras Iago Justo Alonso 《Cirugía espa?ola》2021,99(6):440-449
IntroductionThere is controversy regarding the ideal pancreaticojejunostomy technique after pancreaticoduodenectomy. Many authors consider the external Wirsung stenting technique to be associated with a low incidence of fistula, morbidity and mortality. We analyse our experience with this technique.Patients and methodsA retrospective analysis of the morbidity and mortality of a series of 80 consecutive patients who had been treated surgically over a 6.5-year period for pancreatic head or periampullary tumors, performing pancreaticoduodenectomy and pancreaticojejunostomy with external Wirsung duct stenting.ResultsMean patient age was 68.3 ± 9 years, and the resectability rate was 78%. The texture of the pancreas was soft in 51.2% of patients and hard in 48.8%. Pylorus-preserving resection was performed in 43.8%. Adenocarcinoma was the most frequent tumor (68.8%), and R0 was confirmed in 70% of patients. Biochemical fistula was observed in 11.2%, pancreatic fistula grade B in 12.5% and C in 2.5%, whereas the abdominal reoperation rate was 10%. Median postoperative hospital stay was 16 days, and postoperative and 90-day mortality was 2.5%. Delayed gastric emptying was observed in 36.3% of patients, de novo diabetes in 12.5%, and exocrine insufficiency in 3. Patient survival rates after 1, 3 and 5 years were 80.2, 53.6 and 19.2%, respectively.ConclusionsAlthough our low rates of postoperative complications and mortality using external Wirsung duct stenting coincides with other more numerous recent series, it is necessary to perform a comparative analysis with other techniques, including more cases, to choose the best reconstruction technique after pancreaticoduodenectomy. 相似文献
107.
Binu Prathap Thomas Sreekanth Raveendran Thenmozhi Mani 《Indian Journal of Orthopaedics》2021,55(2):478
BackgroundTardy ulnar nerve palsy is the development of late onset ulnar nerve dysfunction and is usually treated by open anterior transposition of ulnar nerve. Open technique is done using a longitudinal incision about 6–8 inch. in length with chances of development of medial antebrachial cutaneous nerve neuromas.PurposeIn this study, we describe the technique of Endoscopic Anterior Transposition of Ulnar Nerve (EATUN procedure) to treat tardy ulnar nerve palsy and analyze the results.MethodsSeven patients diagnosed to have tardy ulnar nerve palsy was treated by EATUN. The humerus-elbow-wrist angle (HEW), pre- and post-operative intrinsic muscle power and sensory assessment, Dellon scores, and the Q-DASH was analyzed.ResultsThe minimum follow-up was 12 months (Mean 27.4 months, Range 12–36 months). Improvement in Dellon and Q-DASH scores following EATUN procedure was statistically significant. There was objective improvement of intrinsic muscle power and sensation on follow-up, though not statistically significant. No instance of neuroma of the medial cutaneous nerve of forearm was noted.ConclusionsThe endoscopic anterior transposition of the ulnar nerve is a good option in surgical management of tardy ulnar nerve palsy.Level of evidenceTherapeutic Level IV.Supplementary InformationThe online version contains supplementary material available at 10.1007/s43465-021-00366-w. 相似文献
108.
109.
目的:比较经跗骨窦入路使用微创锁定钢板与解剖型锁定钢板治疗跟骨关节内骨折的临床疗效。方法:回顾性分析2016年7月至2017年6月采用跗骨窦入路治疗的48例跟骨关节内骨折患者的临床资料,根据内固定方式不同分为微创锁定钢板组和解剖型锁定钢板组,每组24例。微创锁定钢板组,男14例,女10例;年龄27~46(38.70±5.58)岁;骨折Sanders分型,Ⅱ型18例,Ⅲ型6例。解剖型锁定钢板组,男17例,女7例;年龄26~46(37.10±6.44)岁;骨折Sanders分型,Ⅱ型16例,Ⅲ型8例。观察并比较两组患者手术时间,视觉模拟评分(visual analague scale,VAS),术后并发症情况,比较术后1周及末次随访时B?hler角、Gissane角、跟骨宽度和高度变化情况,采用Maryland足部功能评分进行功能评价。结果:所有患者获得随访,时间12~18(14.10±1.94)个月。48例患者获得骨性愈合,愈合时间8~16(10.60±2.25)周。微创锁定钢板组手术时间、VAS评分、并发症分别为(69.50±7.51) min、(2.80±1.07)分、2例,解剖型锁定钢板组分别为(77.50±7.15) min、(3.80±1.09)分、8例,两组比较差异有统计学意义(P0.05)。两组术后1周及末次随访时B?hler角、Gissane角、跟骨宽度、高度比较差异无统计学意义(P0.05)。两组Maryland足部功能评分比较差异无统计学意义(P0.05)。结论:对于SandersⅡ、Ⅲ型跟骨关节内骨折,经跗骨窦入路使用微创锁定钢板治疗可以达到与解剖型锁定钢板相似的牢靠固定及功能恢复,其操作更简便,手术时间更短,术后早期疼痛更轻,术后并发症更少。 相似文献
110.
Introduction and importanceThe infective endocarditis incidence data for patients undergoing aortic valve neocuspidization with glutaraldehyde-treated autologous pericardium (Ozaki procedure) are rare, and the optimal surgical treatment strategy remains unclear.Case presentationThis is the first case report of surgical treatment of infective endocarditis of aortic valve with cryopreserved homograft in an athlete with previously performed Ozaki procedure.Clinical discussionThe choice of homograft was dictated by the young age of the patient; professional activity as an athlete; refusal of anticoagulants and the need for wide excision of compromised tissues to mitigate potential risk of spread of infection as well as its recurrence.ConclusionThe use of the aortic homograft allowed us to radically remove the infected tissues and achieve hemodynamic characteristics similar to the native valve. This is probably the first case report of use of homograft to treat aortic valve endocarditis following Ozaki procedure. 相似文献