全文获取类型
收费全文 | 104873篇 |
免费 | 8703篇 |
国内免费 | 6139篇 |
专业分类
耳鼻咽喉 | 1112篇 |
儿科学 | 1555篇 |
妇产科学 | 2309篇 |
基础医学 | 12406篇 |
口腔科学 | 1952篇 |
临床医学 | 14039篇 |
内科学 | 16645篇 |
皮肤病学 | 896篇 |
神经病学 | 5673篇 |
特种医学 | 3579篇 |
外国民族医学 | 42篇 |
外科学 | 11245篇 |
综合类 | 14801篇 |
现状与发展 | 23篇 |
一般理论 | 20篇 |
预防医学 | 6123篇 |
眼科学 | 2866篇 |
药学 | 10739篇 |
56篇 | |
中国医学 | 4821篇 |
肿瘤学 | 8813篇 |
出版年
2024年 | 277篇 |
2023年 | 1503篇 |
2022年 | 3802篇 |
2021年 | 4947篇 |
2020年 | 3513篇 |
2019年 | 3227篇 |
2018年 | 3546篇 |
2017年 | 2925篇 |
2016年 | 2849篇 |
2015年 | 4412篇 |
2014年 | 5618篇 |
2013年 | 5017篇 |
2012年 | 7522篇 |
2011年 | 8264篇 |
2010年 | 4981篇 |
2009年 | 3824篇 |
2008年 | 5272篇 |
2007年 | 5537篇 |
2006年 | 5408篇 |
2005年 | 5705篇 |
2004年 | 3837篇 |
2003年 | 3400篇 |
2002年 | 3011篇 |
2001年 | 2442篇 |
2000年 | 2653篇 |
1999年 | 2710篇 |
1998年 | 1595篇 |
1997年 | 1495篇 |
1996年 | 1326篇 |
1995年 | 1179篇 |
1994年 | 996篇 |
1993年 | 657篇 |
1992年 | 1002篇 |
1991年 | 812篇 |
1990年 | 692篇 |
1989年 | 610篇 |
1988年 | 601篇 |
1987年 | 532篇 |
1986年 | 423篇 |
1985年 | 337篇 |
1984年 | 212篇 |
1983年 | 162篇 |
1982年 | 89篇 |
1981年 | 101篇 |
1980年 | 85篇 |
1979年 | 118篇 |
1978年 | 56篇 |
1977年 | 56篇 |
1976年 | 46篇 |
1974年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Yuanqing Yao Jun Qian Shunkang Rong Yuwen Huang Bo Xiong Gang Yang Dengqing Zhang Shimin Deng Jie Tan Que Zhu Changming Deng Dichuan Liu Haitao Ran Zhigang Wang Jing Huang 《Ultrasound in medicine & biology》2019,45(2):490-499
Stellate ganglion (SG) modification has been investigated for arrhythmia treatment. In this study, transesophageal SG imaging and intervention were explored using a homemade 30F integrated focused ultrasonic catheter in healthy mongrel canines in vivo. Anatomic details of SGs were ultrasonically imaged and evaluated. SG had a heterogeneous echoic structure and characteristic profiles sketched by hyper-echoic outlines in an ultrasonogram. Left SGs in the experimental group were successfully ablated through the esophagus under ultrasonic guidance provided by the catheter itself. Two weeks after the ablation, the QT and QTc of the experimental group decreased compared with those of the sham group and at baseline (both p values < 0.001). Histologic examination revealed that left SGs were destroyed. No major complications were observed. This approach may be further explored as a method for ganglia remodeling evaluation and as a strategy of ganglia modification for arrhythmia and for other diseases. 相似文献
12.
Tian-Yuan Xiong Fang-Yang Huang Qi Liu Yong Peng Yuan-Ning Xu Jia-Fu Wei 《Annals of medicine》2020,52(7):361-366
Abstract
Background
Comorbidities are commonly seen in patients with coronavirus disease 2019 (COVID-19), but the clinical implication is not yet well-delineated. We aim to characterize the prevalence and clinical implications of comorbidities in patients with COVID-19. 相似文献13.
14.
15.
Ming-Yeh Yang Ching-Yuan Huang Tina H.T. Chiu Kai-Chih Chang Ming-Nan Lin Liang-Yü Chen Anren Hu 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):494-501
Vitamin D is responsible for multiple metabolic functions in humans. Rickets are the most common disease caused by vitamin D deficiency. It is caused by poor calcium intake resulting in poor serum-ionized calcium. The purpose of this study is to develop a rapid, sensitive, and feasible method to determine the 25-hydroxy-vitamin D3 (25(OH)D3) levels in blood samples for clinical assessment. In this study, gas chromatography coupled mass spectrometry with trimethylsilyl derivatization (TMS-GC-MS) is the most suitable protocol for quantitative analyses of 25(OH)D3. Performance of method was evaluated and compared with liquid chromatography and immunoassay. Method validation has been carried out with plasma specimens. The limit of quantitation of TMS-GC-MS method is 1.5 ppb with good linear correlation. Furthermore, the dietary intake and nutritional status of vegetarian and non-vegetarians in Taiwan were assessed by our validated method. As a result, this vitamin D nutrition survey demonstrates that most Taiwanese people have insufficient vitamin D. Due to dietary habits; the male vegans may have the highest risk of vitamin D deficiency. 相似文献
16.
17.
18.
19.
20.
BACKGROUND/PURPOSE: The importance of accurate triage in Taiwan is becoming more apparent with the increasing number of emergency department (ED) patients, and resources for the National Health Insurance becoming constrained. This study compared the ability of the Taiwan triage system (TTS) and the standardized 5-level Emergency Severity Index (ESI) triage system to predict ED resource utilization. METHODS: Patients arriving at the ED were triaged by both TTS and by using a two-page checklist of ESI criteria during the 3-month study period. The ESI triage level was calculated independently to avoid bias. Disease category (trauma vs. nontrauma), length of stay (LOS) and hospitalization data were evaluated. RESULTS: A total of 3172 patients with both ESI and TWN evaluation were included. The distributions of ESI ratings within TTS level 1 were: ESI 1, 21.1%; ESI 2, 68.1%; ESI 3, 7.4%; ESI 4, 3.4%; ESI 5, 0%. For TTS level 3, they were: ESI 1, 0.1%; ESI 2, 26.2%; ESI 3, 39.5%; ESI 4, 27.5%; ESI 5, 6.8%. Hospitalization rates were 74.5%, 40.9% and 22.2% in TTS levels 1, 2 and 3, respectively; and were 96.2%, 47.0%, 30.9%, 6.7%and 6.6% in ESI levels 1, 2, 3, 4 and 5, respectively. TTS triaged more trauma patients as life-threatening/emergent condition than nontrauma patients (68.8% vs. 48.4%, p < 0.001). Triage by ESI, however, showed no significant difference in the percentage of trauma and nontrauma patients with highly acute conditions (44.2% vs. 46.6%, p = 0.230). Patients with ESI level 4 or 5 have significantly shorter ED LOS than those with ESI level 3. CONCLUSION: ESI produces more accurate discriminating patient acuity, ED LOS and hospitalization rate than TTS. Adopting a standardized 5-level triage tool might improve resource utilization planning of ED practice. 相似文献