全文获取类型
收费全文 | 1110篇 |
免费 | 36篇 |
国内免费 | 65篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 60篇 |
妇产科学 | 12篇 |
基础医学 | 70篇 |
口腔科学 | 37篇 |
临床医学 | 141篇 |
内科学 | 221篇 |
皮肤病学 | 23篇 |
神经病学 | 14篇 |
特种医学 | 245篇 |
外科学 | 59篇 |
综合类 | 30篇 |
预防医学 | 28篇 |
眼科学 | 190篇 |
药学 | 40篇 |
肿瘤学 | 39篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 10篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 19篇 |
2014年 | 14篇 |
2013年 | 24篇 |
2012年 | 17篇 |
2011年 | 13篇 |
2010年 | 35篇 |
2009年 | 41篇 |
2008年 | 31篇 |
2007年 | 73篇 |
2006年 | 37篇 |
2005年 | 33篇 |
2004年 | 18篇 |
2003年 | 26篇 |
2002年 | 21篇 |
2001年 | 20篇 |
2000年 | 16篇 |
1999年 | 21篇 |
1998年 | 61篇 |
1997年 | 69篇 |
1996年 | 72篇 |
1995年 | 59篇 |
1994年 | 43篇 |
1993年 | 49篇 |
1992年 | 12篇 |
1991年 | 24篇 |
1990年 | 16篇 |
1989年 | 42篇 |
1988年 | 25篇 |
1987年 | 39篇 |
1986年 | 17篇 |
1985年 | 30篇 |
1984年 | 21篇 |
1983年 | 25篇 |
1982年 | 23篇 |
1981年 | 19篇 |
1980年 | 23篇 |
1979年 | 2篇 |
1978年 | 10篇 |
1977年 | 12篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1966年 | 2篇 |
排序方式: 共有1211条查询结果,搜索用时 0 毫秒
61.
Templeton AW; Johnson JA; Anderson WH; Cook LT; Dwyer SJ d; Preston DF; Lee KR; Rosenthal SJ; Batnitzky S; Levine E 《Radiology》1984,151(2):527-528
The increasing use of digitally formatted imaging systems requires high-quality interactive gray-scale computer raster graphics systems for the management, display, and analog film recording of digital image and alphanumeric information. These systems are a combination of computer hardware and software and implement a set of graphics protocols. This paper describes a set of interactive graphics protocols that has been developed for clinical use. 相似文献
62.
In a patient with primary hyperparathyroidism an attempt was made to ablate a middle mediastinal parathyroid gland by forceful staining with radiographic contrast material. The gland was stained on two separate occasions, two weeks apart. Both times the serum calcium level temporarily fell to the normal range but reverted to abnormal levels. The patient ultimately required surgery for correction of hypercalcemia. The mechanism of staining and possible reasons for failure as well as potential complications are discussed. 相似文献
63.
64.
Patients with visually significant corneal edema, secondary to endothelial dysfunction, before the development of scarring or vascularization, need only have the corneal endothelium replaced to restore corneal clarity. This fact, plus the lack of consistently available donor material, prompted us to evaluate tissue cultured corneal endothelium (TCCE) as a donor source. We have shown that TCCE, when transplanted, can regain normal morphology and physiologic function. To accomplish practical use of autologous stroma, a transparent gelatin membrane which can serve as substrate for endothelial growth in tissue culture, has been developed. This cellular membrane has been transplanted successfully in rabbits with good functional results. It is hoped that ultimately this technique can be developed for routine use in man. 相似文献
65.
Gallium-67 lung uptake: conjugate-view technique 总被引:1,自引:0,他引:1
A conjugate-view technique is derived for calculation of absolute gallium-67 (Ga-67) uptake from scintillation-camera images. The technique combines counts of posterior and anterior images of the lung with an attenuation correction obtained from cobalt-57 (Co-57) transmission imaging. The formulation is such that the effects of Compton scatter build-up are accounted for. Studies utilizing a canine model indicated that, normally, more activity is located in the chest wall than in the lungs. The quantitative technique must therefore accurately account for a variety of Ga-67 distributions, including that in the chest wall. Calculations were performed using a three-component model comparing results obtained with the conjugate-view approach to the actual uptake. These calculations suggest that an assumption of uniform activity distribution allows an accuracy of approximately +/- 10% over a broad range of body-part thicknesses and uptake by the lungs. It was concluded that the conjugate-view technique is necessarily approximate but can provide clinically useful results. 相似文献
66.
Background
Haemorrhage after Cardio Pulmonary Bypass (CPB) Surgery is a well recognised complication that leads to significant morbidity and mortality. The incidence varies between 5-25% depending upon the clinical situation. Several factors are implicated as causative but none have been precisely proved.Methods
Our study was an attempt to evaluate the haemostatic defect with particular reference to platelet function abnormalities during cardio pulmonary bypass surgery, in order to reduce the morbidity and mortality associated with post CPB haemorrhage. Flow cytometric evaluation of different platelet glycoproteins like GPIb/IX, GPIIb/IIIa and GMP-140 was done.Results
The marker expression showed deregulation during surgery which returned to base after bypass was terminated. In contrast, the cases with bleeding showed significant variation. P-Selectin (GMP 140) expression decreased progressively till 3rd post-operative day showing lack of activation of platelets in cases of severe bleeding.Conclusion
Longer duration of CPB initiates plasmin generation through heparin, which raises the PAI-1-tPA complex and thereby down regulating the functions of platelets. This suggests a link between duration of CPB, bleeding, platelet dysfunction and fibrinolysis. Hence serial estimations of the levels of GMP-140 and tPA can predict severe bleeding.Key Words: CardioPulmonary Bypass, Platelet dysfunction, flowcytometry, platelet glycoproteins, haemorrhage 相似文献67.
68.
Skinner JR Chung SK Montgomery D McCulley CH Crawford J French J Rees MI 《Archives of disease in childhood》2005,90(5):528-529
A 19 day old infant was successfully resuscitated from ventricular fibrillation. The 12 lead ECG was normal, with a normal QT interval, and remains so over three years follow up. DNA analysis revealed a missense mutation (R1193Q) in the SCN5A gene, previously linked with familial sudden unexpected nocturnal death syndrome, also known as Brugada syndrome. 相似文献
69.
70.
Vargas JM McCulley JP Bowman RW Johnston EW Jani BR Shen J 《American journal of ophthalmology》2003,136(1):171-172
PURPOSE: To determine the immediate effect on corneal thickness of cataract extraction using phacoemulsification. DESIGN: Prospective consecutive nonrandomized humans undergoing standard small-incision phacoemulsification and intraocular lens insertion. METHODS: Corneal thickness was measured immediately preoperative and postoperatively in 58 consecutive patients undergoing phacoemulsification in the absence of other ocular abnormalities. Corneal thickness was determined centrally and in the midperiphery of four quadrants. The last 17 eyes were also evaluated for the effect of pressure from a Honan balloon on corneal thickness. SETTING: Faculty practice in medical school and university hospital.The cornea thinned in all five of the measured locations, with statistical significance being reached only in the four midperipheral quadrants. Pressure from the Honan balloon resulted in a negligible increase in corneal thickness preoperatively. CONCLUSIONS: Corneas were found to have thinned statistically significantly immediately after phacoemulsification; however, the degree of thinning has doubtful clinical significance and does not represent a significant dehydration of the cornea during the surgical procedure. 相似文献