全文获取类型
收费全文 | 1155篇 |
免费 | 61篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 51篇 |
妇产科学 | 9篇 |
基础医学 | 154篇 |
口腔科学 | 11篇 |
临床医学 | 76篇 |
内科学 | 302篇 |
皮肤病学 | 17篇 |
神经病学 | 46篇 |
特种医学 | 24篇 |
外科学 | 156篇 |
综合类 | 47篇 |
预防医学 | 52篇 |
眼科学 | 9篇 |
药学 | 83篇 |
中国医学 | 4篇 |
肿瘤学 | 168篇 |
出版年
2023年 | 12篇 |
2022年 | 28篇 |
2021年 | 45篇 |
2020年 | 17篇 |
2019年 | 36篇 |
2018年 | 34篇 |
2017年 | 27篇 |
2016年 | 26篇 |
2015年 | 37篇 |
2014年 | 55篇 |
2013年 | 53篇 |
2012年 | 93篇 |
2011年 | 84篇 |
2010年 | 58篇 |
2009年 | 36篇 |
2008年 | 52篇 |
2007年 | 39篇 |
2006年 | 32篇 |
2005年 | 33篇 |
2004年 | 48篇 |
2003年 | 37篇 |
2002年 | 32篇 |
2001年 | 22篇 |
2000年 | 17篇 |
1999年 | 20篇 |
1997年 | 5篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 9篇 |
1989年 | 12篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1982年 | 6篇 |
1980年 | 11篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1973年 | 10篇 |
1972年 | 7篇 |
1970年 | 13篇 |
1969年 | 8篇 |
1968年 | 7篇 |
1967年 | 8篇 |
1939年 | 4篇 |
排序方式: 共有1218条查询结果,搜索用时 0 毫秒
41.
Nirangkush Borah Amlan Jyoti Kalita Ankur kanti Guha Manash R. Das Chandan Tamuly 《RSC advances》2021,11(58):36698
In this work, a colorimetric approach for the detection of ascorbic acid (AA) and thyroxine (TH) was developed by synthesizing cost-effective silver nanoparticles (AgNPs) decorated with epigallocatechin gallate (EGCG) and CTAB. EGCG is the major bioactive chemical constituent that played a significant role in this study. The environment around the nanoparticle (NP) was controlled by adding CTAB surfactants. The synthesized NPs were characterized by different advanced techniques including XRD, XPS, SEM, and TEM. UV-visible spectra were thoroughly analyzed for sensing of AA and TH and the colour change of the solution can be visually monitored. The change in the localized surface plasmon resonance (LSPR) properties was used as an asset for the detection of AA and TH. A good linear relationship was obtained in both the sensing schemes with a limit of detection (LoD) of 0.67 μM and 0.33 μM for AA and TH respectively. Furthermore, the nanoparticles (NP) were implemented for real-sample analysis (pharmaceutical tablets). A cost-effective filter paper strip-based method coupled with smartphone scanning sensing was developed for the detection of AA. The interaction of AA and TH with the probe was depicted by a density functional theory (DFT) analysis. The synthesized NPs show tremendous selectivity towards AA and TH and excellent potential for practical applications.In this work, a colorimetric approach for the detection of ascorbic acid and thyroxine was developed by synthesizing cost-effective silver nanoparticles (AgNPs) decorated with epigallocatechin gallate (EGCG) and CTAB. 相似文献
42.
Raj Pallavi Desai Sadhana K. Roy Partha Guha Kania Prema 《Journal of obstetrics and gynaecology of India》2020,70(3):234-236
The Journal of Obstetrics and Gynecology of India - 相似文献
43.
44.
Obesity and type 2 diabetes are important risk factors underlying previously undiagnosed cirrhosis in general practice: a cross‐sectional study using transient elastography 下载免费PDF全文
45.
46.
47.
48.
49.
Krishna Prasad Gourav MD DM Subhrashis Guha Niyogi MD Vikram Halder MS Sunder Negi MD DM Avneet Singh MD 《Echocardiography (Mount Kisco, N.Y.)》2020,37(7):1114-1115
Patients with large sub-pulmonic ventricular septal defect (VSD) present early as a results of their complications. Some present late, due to the restriction of VSD by the right coronary cusp (RCC) due to its prolapse. In this report, we present a rare case of sub-pulmonic VSD in a 33-year-old man who developed a sub-pulmonic stenosis due to the prolapse of the RCC into the right ventricular outflow tract. 相似文献
50.
Raphael Jakubovic Joel Ramjist Shaurya Gupta Daipayan Guha Arjun Sahgal F. Stuart Foster Victor X.D. Yang 《Ultrasound in medicine & biology》2018,44(11):2379-2387
High frequency micro-ultrasound (µUS) transducers with central frequencies up to 50?MHz facilitate dynamic visualization of patient anatomy with minimal disruption of the surgical work flow. Micro-ultrasound improves spatial resolution over conventional ultrasound imaging from millimeter to micrometer, but compromises depth penetration. This trade-off is sufficient during an open surgery in which the bone is removed and theultrasound probe can be placed into the surgical cavity. By fusing µUS with pre-operative imaging and tracking the ultrasound probe intra-operatively using our optical topographic imaging technology, we can provide dynamic feedback during surgery, thus affecting clinical decision making. We present our initial experience using high-frequency µUS imaging during spinal procedures. Micro-ultrasound images were obtained in five spinal procedures. Medical rationale for use of µUS was provided for each patient. Surgical procedures were performed using the standard clinical practice with bone removal to facilitate real-time ultrasound imaging of the soft tissue. During surgery, the µUS probe was registered to the pre-operative computed tomography and magnetic resonance images. Images obtained comprised five spinal decompression surgeries (four tumor resections, one cystic synovial mass). Micro-ultrasound images obtained during spine surgery delineated exquisite detailing of the spinal anatomy including white matter and gray matter tracts and nerve roots and allowed accurate assessment of the extent of decompression/tumor resection. In conclusion, tracked µUS enables real-time imaging of the surgical cavity, conferring significant qualitative improvement over conventional ultrasound. 相似文献