全文获取类型
收费全文 | 2458篇 |
免费 | 150篇 |
国内免费 | 18篇 |
学科分类
医药卫生 | 2626篇 |
出版年
2023年 | 6篇 |
2022年 | 10篇 |
2021年 | 47篇 |
2020年 | 32篇 |
2019年 | 46篇 |
2018年 | 60篇 |
2017年 | 48篇 |
2016年 | 64篇 |
2015年 | 58篇 |
2014年 | 122篇 |
2013年 | 117篇 |
2012年 | 196篇 |
2011年 | 219篇 |
2010年 | 137篇 |
2009年 | 131篇 |
2008年 | 211篇 |
2007年 | 230篇 |
2006年 | 199篇 |
2005年 | 182篇 |
2004年 | 144篇 |
2003年 | 133篇 |
2002年 | 141篇 |
2001年 | 24篇 |
2000年 | 7篇 |
1999年 | 13篇 |
1998年 | 17篇 |
1997年 | 2篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1971年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有2626条查询结果,搜索用时 46 毫秒
1.
2.
Anne Liljander Mingyan Yu Elizabeth O'Brien Martin Heller Julia F. Nepper Douglas B. Weibel Ilona Gluecks Mario Younan Joachim Frey Laurent Falquet Joerg Jores 《Journal of clinical microbiology》2015,53(9):2810-2815
Contagious caprine pleuropneumonia (CCPP) is a highly contagious disease caused by Mycoplasma capricolum subsp. capripneumoniae that affects goats in Africa and Asia. Current available methods for the diagnosis of Mycoplasma infection, including cultivation, serological assays, and PCR, are time-consuming and require fully equipped stationary laboratories, which make them incompatible with testing in the resource-poor settings that are most relevant to this disease. We report a rapid, specific, and sensitive assay employing isothermal DNA amplification using recombinase polymerase amplification (RPA) for the detection of M. capricolum subsp. capripneumoniae. We developed the assay using a specific target sequence in M. capricolum subsp. capripneumoniae, as found in the genome sequence of the field strain ILRI181 and the type strain F38 and that was further evidenced in 10 field strains from different geographical regions. Detection limits corresponding to 5 × 103 and 5 × 104 cells/ml were obtained using genomic DNA and bacterial culture from M. capricolum subsp. capripneumoniae strain ILRI181, while no amplification was obtained from 71 related Mycoplasma isolates or from the Acholeplasma or the Pasteurella isolates, demonstrating a high degree of specificity. The assay produces a fluorescent signal within 15 to 20 min and worked well using pleural fluid obtained directly from CCPP-positive animals without prior DNA extraction. We demonstrate that the diagnosis of CCPP can be achieved, with a short sample preparation time and a simple read-out device that can be powered by a car battery, in <45 min in a simulated field setting. 相似文献
3.
Gtz Sophie-Charlotte Marckmann Georg Hasford Joerg Jox Ralf J. 《Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz》2020,63(4):465-474
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - In Deutschland wurde 2016 das 4. Arzneimittelrechtsänderungsgesetz (AMG) verabschiedet, welches auch die... 相似文献
4.
Lena Benski Ismail Viran Frank Katzenberg Joerg C. Tiller 《Macromolecular chemistry and physics.》2021,222(1)
Amphiphilic polymer conetworks (APCNs), which combine two different polymer nanophases, have a broad range of applications that involve their unique potential to separately swell one of these nanophases in a selective solvent. Little is known about the structural changes of such APCNs upon swelling in dependence on the topology. Here, conetworks composed of poly(2‐ethylhexyl acrylate) crosslinked by poly(2‐methyl‐2‐oxazoline) (PMOx) are investigated with small‐angle X‐ray scattering in dry and swollen state using the orthogonal solvents water and toluene. The data clearly show that the structural changes induced by swelling are strongly dependent on the topology of the APCNs. While water leads to fusion of PMOx phases resulting in larger structures than found in the dry APCN, toluene is only swelling the hydrophobic phases without structural changes. 相似文献
5.
6.
7.
Graft rinse prior to reperfusion in liver transplantation: literature review and online survey within the Eurotransplant community 下载免费PDF全文
Philipp Houben Giulia Manzini Michael Kremer Joerg Arend Gabriela A. Berlakovich Ernst Klar Jürgen Klempnauer Jan Lerut Gerd Otto Jacques Pirenne Xavier Rogiers Daniel Seehofer Dirk L. Stippel Peter Schemmer 《Transplant international》2015,28(11):1291-1298
Graft rinse prior reperfusion in liver transplantation (LT) is believed to reduce the incidence of postreperfusion syndrome and improve clinical outcome. A MEDLINE search was performed to obtain a comprehensive review of the published literature dealing with graft rinse in LT. Moreover, all thirty‐four LT centers in the Eurotransplant (ET) region were invited to participate in an online survey to whether or not graft rinse is performed and whether further research in the field is needed. Seventeen reports have been found to investigate graft rinse protocols in 1894 LT recipients. Eighteen of the thirty centers that participated in the online survey performed graft rinse prior reperfusion in LT. The most commonly used rinse solution was albumin. Nineteen centers stated interest in participating in a multicenter RCT in the field. The published literature does not provide concluding appraisal of the benefit of graft rinse in LT. Graft rinse protocols are not standardized and are based on personal experience. Appropriately designed clinical trials addressing the topic are demanded. The online survey appears to be a helpful tool for the evaluation of clinical practice and future research topics in the transplant community. 相似文献
8.
9.
Er:YAG laser osteotomy directed by sensor controlled systems 总被引:2,自引:0,他引:2
Stephan Rupprecht Katja Tangermann Peter Kessler Friedrich Wilhelm Neukam Joerg Wiltfang 《Journal of cranio-maxillo-facial surgery》2003,31(6):337-342
BACKGROUND: Great efforts have been taken in the past to develop laser systems suitable for bone cutting. Laser systems emitting light in the infrared spectrum (2.9, 3.0 microm) have been found to be ideal for efficient bone ablation with very little carbonization. AIM: To evaluate a new laser bone cutting system enabling the automatic detection of different tissue qualities by an integrated sensor to avoid damage to sensitive structures such as blood vessels or nerves. MATERIAL: An Erbium:YAG laser containing an integrated closed-loop control system, was constructed and tested on dissected bone. Process emissions such as resonance changes caused by the interaction of laser light and various tissue structures can be used for a controlled system. Sensor signals from a photodiode and a piezo-electric accelerometer were received and processed to guide the laser osteotomy. METHODS: Tests were performed on dissected bone specimens from rabbit femur (14) and minipig jaw (6). After laser application, the bone specimens were evaluated macroscopically and histologically. RESULTS: The specimens were evaluated histomorphometrically for the depth of cortical bone ablation when the closed-loop control system switched off the laser. Mean courses of 97.45% (pig) and 97.83% (rabbit) showed that the systems work with precision. CONCLUSION: After penetrating the cortical bone layer, the laser beam was promptly interrupted due to extreme changes of the signal character received by the sensor system. The in vitro tests of this new laser closed-loop control system were successful. 相似文献
10.