全文获取类型
收费全文 | 1497篇 |
免费 | 77篇 |
国内免费 | 57篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 90篇 |
妇产科学 | 12篇 |
基础医学 | 198篇 |
口腔科学 | 24篇 |
临床医学 | 190篇 |
内科学 | 344篇 |
皮肤病学 | 56篇 |
神经病学 | 47篇 |
特种医学 | 353篇 |
外科学 | 79篇 |
综合类 | 27篇 |
预防医学 | 66篇 |
眼科学 | 5篇 |
药学 | 68篇 |
中国医学 | 2篇 |
肿瘤学 | 67篇 |
出版年
2023年 | 7篇 |
2022年 | 5篇 |
2021年 | 11篇 |
2020年 | 10篇 |
2019年 | 13篇 |
2018年 | 28篇 |
2017年 | 24篇 |
2016年 | 9篇 |
2015年 | 23篇 |
2014年 | 22篇 |
2013年 | 51篇 |
2012年 | 45篇 |
2011年 | 39篇 |
2010年 | 46篇 |
2009年 | 67篇 |
2008年 | 42篇 |
2007年 | 76篇 |
2006年 | 40篇 |
2005年 | 36篇 |
2004年 | 25篇 |
2003年 | 23篇 |
2002年 | 31篇 |
2001年 | 37篇 |
2000年 | 28篇 |
1999年 | 37篇 |
1998年 | 74篇 |
1997年 | 82篇 |
1996年 | 104篇 |
1995年 | 61篇 |
1994年 | 59篇 |
1993年 | 54篇 |
1992年 | 24篇 |
1991年 | 23篇 |
1990年 | 23篇 |
1989年 | 41篇 |
1988年 | 39篇 |
1987年 | 36篇 |
1986年 | 54篇 |
1985年 | 45篇 |
1984年 | 12篇 |
1983年 | 14篇 |
1982年 | 18篇 |
1981年 | 9篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 12篇 |
1977年 | 9篇 |
1976年 | 13篇 |
1975年 | 13篇 |
1972年 | 4篇 |
排序方式: 共有1631条查询结果,搜索用时 15 毫秒
91.
During antibiotic treatment forE. coli urinary tract infection and meningitis, a male new born developed a Candida albicans urinary tract infection with a mycotic
kidney abcess and pelvicalyceal fungus balls diagnosed by US investigations and confirmed by radiology. Three weeks later
a perirenal urinoma with arterial hypertension developed. After surgical treatment of the urinoma the arterial pressure returned
to normal. 相似文献
92.
直到最近为止,冠心病的内科治疗原则仍是降低心肌需氧量。由于粥样硬化病变一直认为是固定不变的狭窄,不可能增加冠脉血流量,因此认为用药物扩张冠状动脉是徒劳的。在近几年内这些概念有了基本转变。然而仅能引起远端心肌内小动脉扩张的药物却起着相反的作用。当心外膜冠状动脉有粥样硬化时,冠状小动脉扩张可加重血流分布异常,导致心肌缺血。冠状循环由近端大冠状动脉及其分枝小动脉组成的心肌内动脉网构成。近端大冠状 相似文献
93.
Mercado S; Hunter DW; Castaneda-Zuniga WR; Amplatz K; Young AT; Cardella JF; Lange PH; Hulbert JC; Reddy P 《Radiology》1986,158(1):207-209
Percutaneous nephrostolithotomy, which can require a double puncture, is presently the method of choice in our institution for the removal of renal stones. Patients that underwent this procedure were evaluated to identify the possible reasons for the double puncture. Of 200 patients evaluated, 14 needed a second tract. The three variables that determined whether a second puncture was needed, in order of importance, were number and size of the stones, with second tracts needed in patients with multiple stones and staghorn calculi; anatomical variations of the renal collecting system itself, with bifid systems the most significant anatomic variation; and the dexterity of the radiologist in performing the puncture and the ability of the urologist to extract the stone. Second tracts were needed more frequently in patients who presented with stones in both the lower and middle poles of the collecting systems. 相似文献
94.
The preservation of red cell antigens at low ionic strength 总被引:1,自引:0,他引:1
Low-ionic-strength saline (LISS) techniques permit a safe and substantial reduction in incubation time and have therefore become the method of choice for antibody detection and compatibility testing in many transfusion laboratories. Consequently, the supply of reagent red cells (RBCs) in a low-ionic-strength preservative solution would remove the daily need for laboratories to wash and resuspend cells in LISS before use. However, the storage of fresh RBCs at low ionic strength in the presence of aminoglycoside antibiotics can cause a rapid loss of certain antigens, possibly as a result of the release of proteolytic enzymes from contaminating white cells. This article describes a low-ionic-strength solution that achieves preservation of antigens on liquid nitrogen-frozen-thawed RBCs for 21 days' storage at 4 degrees C. 相似文献
95.
C Chrétiennot-Bara A Gu?t E Balzamo G Noseda M F Torchet C Rothshild P Blakimé P Schmit J P Schmit 《Archives de pédiatrie》2001,8(8):828-833
Spinal epidural hematoma is an uncommon complication in hemophilia. CASE REPORTS: The cases of an extensive epidural hematoma in two boys with severe hemophilia are reported. CONCLUSION: Acute onset of severe neck pain or backache leads to the diagnosis of epidural hematoma in children with hemophilia, even in the absence of neurologic symptoms. Early diagnosis is important and relies on magnetic resonance imaging. Replacement therapy is mandatory and must be prescribed before neuroradiologic imaging. Generally, children have a good neurologic outcome. 相似文献
96.
Prostatic evaluation by transrectal sonography with histopathologic correlation: the echopenic appearance of early carcinoma 总被引:6,自引:0,他引:6
Fifty-two patients with clinical stage A and B carcinomas of the prostate were imaged by ultrasound (US) transrectally with a 5-MHz linear array transducer and transabdominally with a 3-MHz sector scanner prior to radical prostatectomy. The fresh specimens of 44 prostate glands were scanned in a water bath with a 5-MHz linear array transducer in multiple planes. In all cases, histopathologic correlation was obtained. Prostatic carcinoma presented as an echopenic lesion in 54% of the specimens, as a slightly hypoechoic area in 22%, and could not be identified in 24% because of its isoechoic characteristics. In contrast to many previous reports, no instance of echogenic cancer was observed. 相似文献
97.
Venous clots: evaluation with MR imaging 总被引:2,自引:0,他引:2
In vitro and in vivo studies were performed to determine the proton relaxation and imaging characteristics of static blood and acute and organized clot in canine jugular veins. In vivo, it was found that two inversion recovery sequences using a short inversion time (100 msec) demonstrated better differentiation of signal intensity of intravascular clot from surrounding soft tissues than did standard T1- and T2-weighted sequences. In vitro, quantitative measurements showed marked reduction of both T1 and T2 relaxation time of acute clot compared with stagnant blood. In addition, the T1 relaxation time, and to a lesser extent the T2 relaxation time, shortened as the clot aged, indicating a potential role for magnetic resonance imaging in determining the age of venous thrombi. 相似文献
98.
99.
High-field surface coil magnetic resonance (MR) images were obtained of 12 ankles: two from healthy volunteers, seven from patients, and three from fresh cadavers. The cadaver ankles were sectioned in the coronal, sagittal, and axial planes for direct comparison with the MR images. Plain film confirmation of pathologic conditions was obtained in all patients, and five underwent arthroscopy or surgery, or both. MR imaging provided excellent delineation of ligaments and cartilaginous structures in all cases. 相似文献
100.