全文获取类型
收费全文 | 33809篇 |
免费 | 3277篇 |
国内免费 | 918篇 |
专业分类
耳鼻咽喉 | 375篇 |
儿科学 | 678篇 |
妇产科学 | 403篇 |
基础医学 | 4275篇 |
口腔科学 | 644篇 |
临床医学 | 3648篇 |
内科学 | 6305篇 |
皮肤病学 | 650篇 |
神经病学 | 1953篇 |
特种医学 | 1551篇 |
外国民族医学 | 3篇 |
外科学 | 4625篇 |
综合类 | 2534篇 |
现状与发展 | 3篇 |
一般理论 | 4篇 |
预防医学 | 2594篇 |
眼科学 | 1025篇 |
药学 | 3194篇 |
23篇 | |
中国医学 | 1130篇 |
肿瘤学 | 2387篇 |
出版年
2024年 | 96篇 |
2023年 | 428篇 |
2022年 | 1038篇 |
2021年 | 1865篇 |
2020年 | 1178篇 |
2019年 | 1218篇 |
2018年 | 1314篇 |
2017年 | 1025篇 |
2016年 | 1115篇 |
2015年 | 1437篇 |
2014年 | 1755篇 |
2013年 | 1887篇 |
2012年 | 2872篇 |
2011年 | 2709篇 |
2010年 | 1671篇 |
2009年 | 1406篇 |
2008年 | 2052篇 |
2007年 | 1866篇 |
2006年 | 1644篇 |
2005年 | 1471篇 |
2004年 | 1188篇 |
2003年 | 1100篇 |
2002年 | 952篇 |
2001年 | 817篇 |
2000年 | 756篇 |
1999年 | 612篇 |
1998年 | 256篇 |
1997年 | 217篇 |
1996年 | 173篇 |
1995年 | 141篇 |
1994年 | 120篇 |
1993年 | 104篇 |
1992年 | 201篇 |
1991年 | 161篇 |
1990年 | 169篇 |
1989年 | 150篇 |
1988年 | 139篇 |
1987年 | 110篇 |
1986年 | 94篇 |
1985年 | 83篇 |
1984年 | 65篇 |
1983年 | 56篇 |
1982年 | 39篇 |
1981年 | 23篇 |
1980年 | 27篇 |
1979年 | 32篇 |
1978年 | 17篇 |
1976年 | 18篇 |
1975年 | 15篇 |
1970年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Jiang Guoxiang Zhang Ruihua Yang Xuan Zhang Wen Hou Yubin 《Clinical and experimental medicine》2022,22(2):193-200
Clinical and Experimental Medicine - Colon cancer is one of most common cancers. The progression of various cancers is driven by miRNA-570. The role of miRNA-570 in the progression of colon cancer... 相似文献
2.
Deitelzweig Steve Luo Xuemei Nguyen Jennifer L. Malhotra Deepa Emir Birol Russ Cristina Li Xiaoyan Lee Theodore C. Ferri Mauricio Wiederkehr Danny Reimbaeva Maya Barnes Geoffrey D. Piazza Gregory 《Journal of thrombosis and thrombolysis》2022,54(4):696-696
Journal of Thrombosis and Thrombolysis - 相似文献
3.
Daniel Schar Pawin Padungtod Nguyen Tung Michael OLeary Wantanee Kalpravidh Filip Claes 《Influenza and other respiratory viruses》2019,13(6):618-621
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized. 相似文献
4.
5.
Hyun Jong Choi Jong Ho Moon Yun Nah Lee Hyun Su Kim Ji Su Ha Tae Hoon Lee Sang‐Woo Cha Young Deok Cho Sang‐Heum Park 《Digestive endoscopy》2015,27(7):772-775
Direct peroral cholangioscopy (POC) using an ultra‐slim upper endoscope is one modality of POC for intraductal endoscopic evaluation and treatment of the bile duct. Choledochoduodenostomy (CDS) is one modality of biliary bypass surgery that provides a new route to the bile duct. We carried out direct POC using an ultra‐slim upper endoscope without the use of accessories in 10 patients (four sump syndromes, three bile duct strictures and three intrahepatic duct stones) previously undergoing surgical CDS. Direct POC was successful in all patients. The use of an intraductal balloon catheter was required in one patient for advancement of the endoscope into the bile duct. Distal bile ducts with sump syndromes were cleared using baskets and water irrigation under direct POC. Cholangiocarcinoma was diagnosed in one patient with hilar bile duct stricture after cholangioscopic evaluation and a targeting forceps biopsy under direct POC. Intrahepatic duct stones were successfully extracted after intraductal fragmentation under direct POC. Oozing bleeding occurred during intraductal lithotripsy but stopped spontaneously. Direct POC using an ultra‐slim upper endoscope without the assistance of accessories can easily be carried out in patients undergoing CDS. 相似文献
6.
应用拷贝数变异测序(copy number variation sequencing,CNV-seq)技术鉴别来源不明的胎儿标记染色体,明确其遗传物质的来源,并探讨此技术在产前诊断中的应用价值。讨论Pallister-Killian综合征(Pallister-Killian syndrome,PKS)的临床特征及遗传学特点,提高对此类罕见染色体疾病的认识。该病例因在妊娠中期超声发现胎儿异常而行羊水穿刺进行CNV-Seq检测,同时分析胎儿和父母的核型。羊水CNV-Seq结果示该样本12号染色体p13.33-p11.1处检测到拷贝数为3.5、片段大小为34.70 Mb的嵌合重复区域;羊水染色体核型结果为47,XY,+i(12)(p10)[58]/46,XX[42],综合上述结果考虑为PKS。通过结合超声结果,综合应用染色体G显带核型分析和CNV-seq技术能准确确认染色体异常片段来源,在产前有效诊断PKS患者。 相似文献
7.
目的:通过布局网络版色谱工作站,实现色谱系统电子实验数据合规化,提升实验室色谱电子数据的安全性,提高实验室色谱系统管理的效率。方法:布局线上网络版色谱工作站。结果:工作站运行良好,升级数据安全,法规响应更完善,节省了实验室管理及维护成本。结论:值得在有色谱需求的实验室推广。 相似文献
8.
In this paper, we introduce a new type of troubled-cell indicator to improve
hybrid weighted essentially non-oscillatory (WENO) schemes for solving the hyperbolic conservation laws. The hybrid WENO schemes selectively adopt the high-order
linear upwind scheme or the WENO scheme to avoid the local characteristic decompositions and calculations of the nonlinear weights in smooth regions. Therefore,
they can reduce computational cost while maintaining non-oscillatory properties in
non-smooth regions. Reliable troubled-cell indicators are essential for efficient hybrid
WENO methods. Most of troubled-cell indicators require proper parameters to detect
discontinuities precisely, but it is very difficult to determine the parameters automatically. We develop a new troubled-cell indicator derived from the mean value theorem
that does not require any variable parameters. Additionally, we investigate the characteristics of indicator variable; one of the conserved properties or the entropy is considered as indicator variable. Detailed numerical tests for 1D and 2D Euler equations are
conducted to demonstrate the performance of the proposed indicator. The results with
the proposed troubled-cell indicator are in good agreement with pure WENO schemes.
Also the new indicator has advantages in the computational cost compared with the
other indicators. 相似文献
9.
Hyo-Kon Kim Sung-Han Ha Gi-Jun Lee Sun-O Yu Jung-Rae Kim 《Clinics in Orthopedic Surgery》2015,7(3):414-417
Synovial chondromatosis is a rare lesion in the wrist, but some cases in the distal radioulnar joint have been reported and previous case reports emphasize joint calcifications, shown on preoperative plain radiographs. We report an extremely uncommon case of synovial chondromatosis in the pisotriquetral joint, in which radiographs and magnetic resonance imaging did not demonstrate apparent calcified bodies. In our case, for the accurate diagnosis and treatment, surgical exploration of the joint and synovectomy with removal of loose bodies was performed. 相似文献
10.