全文获取类型
收费全文 | 89306篇 |
免费 | 8093篇 |
国内免费 | 4888篇 |
专业分类
耳鼻咽喉 | 1405篇 |
儿科学 | 1173篇 |
妇产科学 | 1415篇 |
基础医学 | 11387篇 |
口腔科学 | 1602篇 |
临床医学 | 10652篇 |
内科学 | 15171篇 |
皮肤病学 | 1588篇 |
神经病学 | 5156篇 |
特种医学 | 3854篇 |
外国民族医学 | 37篇 |
外科学 | 9491篇 |
综合类 | 10433篇 |
现状与发展 | 16篇 |
一般理论 | 12篇 |
预防医学 | 5467篇 |
眼科学 | 2069篇 |
药学 | 9133篇 |
60篇 | |
中国医学 | 4050篇 |
肿瘤学 | 8116篇 |
出版年
2024年 | 250篇 |
2023年 | 1317篇 |
2022年 | 3231篇 |
2021年 | 4448篇 |
2020年 | 3234篇 |
2019年 | 3100篇 |
2018年 | 3266篇 |
2017年 | 2874篇 |
2016年 | 2816篇 |
2015年 | 4109篇 |
2014年 | 4867篇 |
2013年 | 4790篇 |
2012年 | 6820篇 |
2011年 | 7220篇 |
2010年 | 4537篇 |
2009年 | 3519篇 |
2008年 | 4832篇 |
2007年 | 4662篇 |
2006年 | 4520篇 |
2005年 | 4331篇 |
2004年 | 3179篇 |
2003年 | 2959篇 |
2002年 | 2498篇 |
2001年 | 2029篇 |
2000年 | 1931篇 |
1999年 | 1883篇 |
1998年 | 1076篇 |
1997年 | 1006篇 |
1996年 | 801篇 |
1995年 | 728篇 |
1994年 | 655篇 |
1993年 | 414篇 |
1992年 | 695篇 |
1991年 | 565篇 |
1990年 | 491篇 |
1989年 | 412篇 |
1988年 | 406篇 |
1987年 | 348篇 |
1986年 | 282篇 |
1985年 | 237篇 |
1984年 | 161篇 |
1983年 | 111篇 |
1982年 | 51篇 |
1981年 | 68篇 |
1980年 | 43篇 |
1979年 | 69篇 |
1978年 | 45篇 |
1977年 | 41篇 |
1976年 | 49篇 |
1973年 | 42篇 |
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
91.
Ho-Seong Han Jai Young Cho Yoo-Seok Yoon 《Journal of hepato-biliary-pancreatic sciences》2009,16(4):427-432
Many studies have recently reported on laparoscopic liver resection, although its development has been slow compared to laparoscopy in other fields. The indications for the location of laparoscopic liver resection have previously been limited to easily accessible lesions. Performing laparoscopic liver resection in the posterior and superior parts of the liver has been considered difficult due to inadequate exposure, the poor operative field and the difficulty with parenchymal dissection. Flexible endoscopy, high definition imaging and various kinds of equipment for parenchymal transection have been introduced for clinical use. In addition, much experience with this procedure has been accumulated at many centers. Accordingly, there are an increasing number of reports on laparoscopic liver resection in difficult locations. At our institution, the location of the tumor is no longer a limitation to laparoscopic liver resection. However, for safer laparoscopic liver resection, the patient positioning and trocar placement should be individualized according to the tumor location. The type of resection also may depend on the remaining liver’s functional capacity. We describe here the technical considerations for performing laparoscopic liver resection, including the technical considerations for performing laparoscopic liver resection for lesions located in the postero-superior segments of the liver. 相似文献
92.
93.
新型纳米根管充填材料对成骨细胞生长的影响 总被引:2,自引:0,他引:2
通过体外培养的成骨细胞,采用二甲基噻唑二苯基四唑溴盐比色法和流式细胞术对新型纳米根管充填材料(nHA-PA66)作用下的成骨细胞生长情况的变化进行研究,评价其对成骨细胞生长的影响。以该材料的细胞培养基浸提液作用于实验组细胞,对照组采用培养基本身。实验组和对照组成骨细胞的生长情况和细胞周期无显著性差异,表明该新型纳米材料对成骨细胞的生长和细胞周期无不良影响。提示新型纳米根管充填材料的成骨细胞相容性较好,具有用作根充材料的基础。 相似文献
94.
经腹及经阴道B超监测卵泡发育的评估 总被引:3,自引:0,他引:3
应用经腹及经阴道B超对68名不孕症妇女,139个月经周期进行卵泡发育及排卵监测。卵泡检出率TAUS为90.6%,TVUS为98.0%,显著高于前者,P<0.05。成熟卵泡特征影象(卵丘等)在TVUS显象率较高。TVUS监测卵泡发育更实用可靠。 相似文献
95.
心血管疾病并发焦虑抑郁症状2050例心理干预治疗分析 总被引:13,自引:1,他引:12
目的:了解心血管疾病并发焦虑抑郁症状的情况并探讨心理干预等对焦虑抑郁症状的影响。方法:对住院的2050例心血管疾病并发焦虑抑郁症状的患者进行回顾性分析。结果:心血管疾病患者中并发有焦虑抑郁症状者占56%;其常表现为类似心绞痛、左心衰竭症状,可并发有心律失常;高血压病并发有焦虑抑郁患者对血压升高的耐受性差,动态血压检查以非勺型改变者居多;单纯使用心血管药物治疗效果欠佳,心理干预,焦虑抑郁症状严重者结合抗焦虑抑郁药物疗效显著。结论:心血管疾病患者常并发焦虑抑郁症状,心理干预治疗等可有效改善患者的症状。 相似文献
96.
Frank Huang-Chih Chou Tom Tung-Ping Su Pesus Chou Wen-Chen Ou-Yang Ming-Kun Lu I-Chia Chien 《台湾医志》2005,104(5):308-317
BACKGROUND AND PURPOSE: The catastrophic Chi-Chi earthquake of September 21, 1999 in Taiwan provided a unique opportunity to study the disaster's psychiatric impact on survivors. This study assessed the development of psychiatric disorders among residents in a Taiwanese village near the epicenter of the earthquake within 6 months of the disaster. METHODS: A total of 442 of the 602 actual living residents of Tong-Chi village who were over 16 years of age and were present in the community at the time of the earthquake were included in this population survey. Subjects were interviewed by psychiatrists using the Mini-International Neuropsychiatric Interview and questionnaires to collect demographic information and risk factors for psychiatric disorders 4 to 6 months after the earthquake. RESULTS: The prevalence rates were 9.5% for current major depression, 2.8% for past major depressive episode, and 7.9% for post-traumatic stress disorder (PTSD). Females had significantly higher rates of most psychiatric disorders. After controlling for covariates, the significant risk factors for PTSD were female gender and having sought medical service after the earthquake. Significant risk factors for major depressive episode were divorced/widowed status, education level equal to or below primary school, and prominent house damage. CONCLUSION: This population survey of earthquake disaster survivors found an increased prevalence of psychiatric disorders after exposure to a catastrophic earthquake. These results highlight the need for prompt therapeutic attention to residents of earthquake disaster areas after the event. 相似文献
97.
Anterior mediastinal immature teratoma with precocious puberty in a child with Klinefelter syndrome.
Pen-Hua Su Shi-Ping Luh Da-Mien Yieh Jia-Yuh Chen Suh-Jen Chen Huei-Mei Hung Pei-Fen Liao 《台湾医志》2005,104(8):601-604
ABSTRACT: Klinefelter syndrome occurs in approximately 1 in 1000 males. A 4-year-old boy presented with precocious puberty and an anterior mediastinal mass. Serum alpha-fetoprotein and human chorionic gonadotropin levels were mildly increased. Computed tomography revealed a germ cell tumor (GCT) of the mediastinum. Complete resection of the tumor was performed. Histologic analysis revealed an immature teratoma. Males with Klinefelter syndrome develop GCTs at a rate 50 times higher than unaffected males. This case report calls attention to the need to rule out Klinefelter syndrome in boys who present with precocious puberty and a mediastinal GCT. 相似文献
98.
本文应用核磁共振法(NMR)测定了几种混合体系的 HLB 值与混合体系中各组分的 HLB 值。实验结果表明,混合体系中各组分在核磁共振图谱中的积分曲线高度也具有加和性。混合体系的 HLB 值是体系中各组分 HLB 值的加权平均值。因此,对混合体系的 HLB 值可以应用 NMR 法直接测定,也可应用 NMR 法测定各组分的 HLB值,通过计算求得,计算值与实测值完全一致。 相似文献
99.
目的 合理应用影像学检查,探讨腰腿痛的病因诊断,为临床治疗提供依据.方法 对38例腰腿痛患者进行随访,观察普通照片后经CT、MRI及B超等复查的最后诊断,对比进行分析.结果 单纯普通照片对椎间盘脱出、椎管狭窄、骶部硬膜外囊肿、股骨头无菌坏死、梨状肌损伤等疾病缺乏直接征象,不能作为诊断依据.结论 应用CT、MRI现代影像技术,同时借助B超、肌电图等相关检查,是确诊腰腿痛病因的有效方法. 相似文献
100.
End-systolic pressure-volume relations (ESPVRs) were analyzed in 10 closed-chest autonomically blocked dogs before and after volume loading that restored end-diastolic volume to its value measured in the control conscious state. Dogs had been previously instrumented with a left ventricular pressure micromanometer and ultrasonic crystals for measurements of major, anteroposterior, and septum-free wall diameters. Left ventricular volume was calculated with an ellipsoidal model in the left ventricular cavity. ESPVRs obtained during caval occlusion after volume loading were curvilinear as shown by the division of the relation into two parts. The initial part of the relation had a significantly smaller ESPVR slope (Ees, 12.0 +/- 1.8 mm Hg/ml) and ESPVR volume-axis intercept (Vd, - 3.5 +/- 0.8 ml) than the final part of the relation (19.5 +/- 3.1 mm Hg/ml and 0.0 +/- 0.6 ml, respectively, p less than 0.01). The end-diastolic volume-peak dP/dt relation showed a similar curvilinearity when end-diastolic volumes were larger than 1.5-1.7 times the minimal end-diastolic volume reached during caval occlusion. ESPVRs were not different during aortic constriction and caval occlusion when end-diastolic volume was small. In contrast, with large end-diastolic volumes, Ees and Vd were significantly smaller during caval occlusion than during aortic constriction. The final part of ESPVR (with small end-diastolic volume) had the same slope and intercept as that during aortic constriction. We conclude that preload produces a curvilinearity of ESPVR that significantly modifies derived indexes when the range of preload changes is large. 相似文献