全文获取类型
收费全文 | 3632篇 |
免费 | 224篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 46篇 |
儿科学 | 290篇 |
妇产科学 | 192篇 |
基础医学 | 321篇 |
口腔科学 | 201篇 |
临床医学 | 299篇 |
内科学 | 728篇 |
皮肤病学 | 63篇 |
神经病学 | 270篇 |
特种医学 | 88篇 |
外科学 | 460篇 |
综合类 | 65篇 |
预防医学 | 154篇 |
眼科学 | 200篇 |
药学 | 195篇 |
中国医学 | 15篇 |
肿瘤学 | 296篇 |
出版年
2024年 | 5篇 |
2023年 | 55篇 |
2022年 | 124篇 |
2021年 | 208篇 |
2020年 | 108篇 |
2019年 | 115篇 |
2018年 | 147篇 |
2017年 | 97篇 |
2016年 | 125篇 |
2015年 | 145篇 |
2014年 | 187篇 |
2013年 | 224篇 |
2012年 | 311篇 |
2011年 | 270篇 |
2010年 | 155篇 |
2009年 | 115篇 |
2008年 | 238篇 |
2007年 | 239篇 |
2006年 | 219篇 |
2005年 | 188篇 |
2004年 | 166篇 |
2003年 | 140篇 |
2002年 | 124篇 |
2001年 | 33篇 |
2000年 | 20篇 |
1999年 | 20篇 |
1998年 | 11篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 9篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1936年 | 2篇 |
1923年 | 1篇 |
排序方式: 共有3883条查询结果,搜索用时 15 毫秒
71.
AIM:To quantify corneal ultrastructure using laser scanning in vivo confocal microscopy (IVCM) in patients with keratoconus and control subjects.METHODS: Unscarred corneas of 78 keratoconic subjects without a history of contact lens use and 36 age-matched control subjects were evaluated with slit-lamp examination (SLE), corneal topography and laser scanning IVCM. One eye was randomly chosen for analysis. Anterior and posterior stromal keratocyte, endothelial cell and basal epithelial cell densities and sub-basal nerve structure were evaluated.RESULTS: IVCM qualitatively demonstrated enlarged basal epithelial cells, structural changes in sub-basal and stromal nerve fibers, abnormal stromal keratocytes and keratocyte nuclei, and pleomorphism and enlargement of endothelial cells. Compared with control subjects, significant reductions in basal epithelial cell density (5817±306 cells/mm2 vs 4802±508 cells/mm2, P<0.001), anterior stromal keratocyte density (800±111 cells/mm2 vs 555±115 cells/mm2, P<0.001), posterior stromal keratocyte density (333±34 cells/mm2 vs 270±47 cells/mm2, P<0.001), endothelial cell density (2875±223 cells/mm2 vs 2686±265 cells/mm2, P<0.001), sub-basal nerve fiber density (31.2±8.4 nerves/mm2 vs 18.1±9.2 nerves/mm2, P<0.001), sub-basal nerve fiber length (21.4±3.4 mm/mm2 vs 16.1±5.1 mm/mm2, P<0.001), and sub-basal nerve branch density (median 50.0 (first quartile 31.2 - third quartile 68.7) nerve branches/mm2 vs median 25.0 (first quartile 6.2 - third quartile 45.3) nerve branches/mm2, P<0.001) were observed in patients with keratoconus.CONCLUSION: Significant microstructural abnormalities were identified in all corneal layers in the eyes of subjects with keratoconus using IVCM. This non-invasive in vivo technique provides an important means to define and follow progress of microstructural changes in patients with keratoconus. 相似文献
72.
Demir Arzu Meltem Aydin Fatma Acar Banu Kurt Tuba Poyraz Aylar Kiremitci Saba Gülleroglu Basak Azili Müjdem Nur Bayrakci Umut Selda 《Clinical rheumatology》2021,40(9):3817-3825
Clinical Rheumatology - Autoimmune pancreatitis (AIP) type 1 is an IgG4-related disease (IgG4-RD), characterized by inflammatory pseudotumors and histologically by dense lymphoplasmacytic... 相似文献
73.
Erdal Simay Nalbantoğlu Banu Gür Mert Berke Yıldırım Murathan Kılıçarslan Alperen Kaymaz-Tahra Sema Alibaz-Öner Fatma Yay Meral Mumcu Gonca Direskeneli Haner 《Clinical rheumatology》2021,40(10):4109-4116
Clinical Rheumatology - The aim of this study was to evaluate the relationships among the disease activity, illness perception, daily life performance, anxiety and depression status as potential... 相似文献
74.
75.
Mitra Sanjana Grant Cameron Nolan Seonaid Mohd Salleh Nur Afiqah Milloy M.-J. Richardson Lindsey 《AIDS and behavior》2022,26(6):1933-1942
AIDS and Behavior - A robust evidence-base describes the beneficial association between opioid agonist therapy (OAT) and HIV-related outcomes among people living with HIV and opioid use disorder.... 相似文献
76.
77.
To verify whether low-dose aprotinin reduces blood loss and blood product usage in patients with clopidogrel exposure within 5 days before off-pump coronary artery bypass, 51 patients with clopidogrel exposure were randomized in a double-blind fashion to receive low-dose aprotinin (25 patients), or placebo (26 patients). The baseline characteristics and number of distal anastomoses in the patients in each group were comparable. Time between the last dose of clopidogrel and start of the operation was similar in both groups, as was mean left ventricular ejection fraction. Chest tube drainage, blood product usage, and reoperation rate were significantly higher in the placebo group. In patients with unstable angina and recent clopidogrel exposure who are undergoing off-pump coronary artery bypass, intraoperative administration of low-dose aprotinin is recommended to reduce blood loss and transfusion requirements. 相似文献
78.
In cases of severe malaria chloroquine phosphate is frequently given--diluted or undiluted--by the intravenous route. It is known that cardiac arrhythmias and hypotension may complicate such therapy, but cardiac arrest is not a well recognised hazard. In this report we describe such a tragic complication, and advocate that undiluted chloroquine should not be administered intravenously in severely ill patients since such patients usually have associated electrolyte disturbances which may render the heart vulnerable to toxic drugs. Chloroquine may be given diluted in normal saline infused over several hours with a close watch over the blood pressure. 相似文献
79.
Ozturk Buket Caliskaner Atahan Ersan Gencer Aysegul Harbiyeli Deniz Ongel Karabul Emine Mazıcan Nejdiye Toplutas Kubra Nur Acar Hazal Cansu Sager Sait Gemicioglu Bilun Borekci Sermin 《Annals of nuclear medicine》2021,35(10):1117-1125
Annals of Nuclear Medicine - Pulmonary embolism is a severe source of mortality and morbidity in patients with severe and critical coronavirus disease 2019. It is not yet clear whether the tendency... 相似文献
80.
Sebnem Egriboyun Gamze Ugurluer Funda Vesile Corapcioglu Levent Celik Gorkem Gungor Banu Atalar Enis Ozyar 《Journal of Medical Imaging and Radiation Sciences》2021,52(2):305-311
Extracranial malignant rhabdoid tumors are rare and aggressive tumors that typically occur in the pediatric age group and have a poor prognosis. Herein, we report a case of a one year and five months old male infant who was referred with the diagnosis of malignant rhabdoid tumor of the liver. Magnetic resonance guided stereotactic body radiotherapy was administered with concomitant chemotherapy. Treatment was well tolerated with no severe acute side effects. A 40.8% volumetric reduction of the tumor was observed at the last fraction of MR guided radiotherapy. 相似文献