全文获取类型
收费全文 | 18471篇 |
免费 | 803篇 |
国内免费 | 252篇 |
专业分类
耳鼻咽喉 | 91篇 |
儿科学 | 450篇 |
妇产科学 | 765篇 |
基础医学 | 798篇 |
口腔科学 | 129篇 |
临床医学 | 6397篇 |
内科学 | 2984篇 |
皮肤病学 | 182篇 |
神经病学 | 878篇 |
特种医学 | 1108篇 |
外科学 | 1207篇 |
综合类 | 2671篇 |
现状与发展 | 1篇 |
预防医学 | 498篇 |
眼科学 | 213篇 |
药学 | 772篇 |
6篇 | |
中国医学 | 190篇 |
肿瘤学 | 186篇 |
出版年
2024年 | 12篇 |
2023年 | 81篇 |
2022年 | 195篇 |
2021年 | 264篇 |
2020年 | 316篇 |
2019年 | 279篇 |
2018年 | 347篇 |
2017年 | 343篇 |
2016年 | 375篇 |
2015年 | 370篇 |
2014年 | 874篇 |
2013年 | 996篇 |
2012年 | 918篇 |
2011年 | 1034篇 |
2010年 | 934篇 |
2009年 | 949篇 |
2008年 | 996篇 |
2007年 | 1081篇 |
2006年 | 1086篇 |
2005年 | 1031篇 |
2004年 | 909篇 |
2003年 | 708篇 |
2002年 | 641篇 |
2001年 | 666篇 |
2000年 | 538篇 |
1999年 | 488篇 |
1998年 | 405篇 |
1997年 | 411篇 |
1996年 | 364篇 |
1995年 | 337篇 |
1994年 | 271篇 |
1993年 | 235篇 |
1992年 | 203篇 |
1991年 | 177篇 |
1990年 | 133篇 |
1989年 | 82篇 |
1988年 | 89篇 |
1987年 | 67篇 |
1986年 | 59篇 |
1985年 | 78篇 |
1984年 | 43篇 |
1983年 | 34篇 |
1982年 | 41篇 |
1981年 | 21篇 |
1980年 | 10篇 |
1979年 | 7篇 |
1978年 | 10篇 |
1977年 | 5篇 |
1976年 | 8篇 |
1974年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
51.
M. Bertolotto G. Serafini L. Dogliotti N. Gandolfo N. G. Gandolfo M. Belgrano F. Prefumo 《Abdominal imaging》2004,30(1):108-112
Cancer of the penis is a rare neoplasm in developed countries but worldwide represents a significant health problem. In this
study, the ultrasonographic features of primary and secondary malignant lesions of the penis are described. Squamous cell
carcinoma usually presents as a hypoechoic lesion with heterogeneous appearance. Invasions of the corpora cavernosa and the
corpus spongiosum are appreciable. B-cell lymphoma presents as a well-vascularized mass, a plaque, or ulcers in the penile
skin. Penile metastases result from hematogenous or lymphatic spreading of distant tumors or, more frequently, as penile infiltration
by tumors from adjacent organs. Diffuse corporeal or nodular involvement can result.
1Award-winning poster at the 10th European Symposium on Urogenital Radiology; Uppsala, Sweden, September 4•7, 2003. 相似文献
52.
53.
负压对缺血肢体血流动力学影响的实验研究 总被引:2,自引:0,他引:2
目的:观察负压对肢体动脉闭塞犬患肢血流动力学的影响。方法:犬15只,随机分治疗组10只和对照组5只。两组均采用切断犬后肢股动脉分支、动脉腔内置入螺旋状金属丝的方法,制作肢体缺血模型。在模型制作后2wk,治疗组行患肢负压治疗10d,对照组不做负压治疗。两组均于模型前、模型后2wk及治疗结束后,用彩色多普勒观察患肢股动脉血流动力学指标:收缩期最大流速(Vmax)、平均流速(Vmean)、阻力指数(R1)、搏动指数(P1)的变化。结果:治疗组在治疗后患肢股动脉Vmax、Vmean显著增加(P<0.001),RI、PI显著降低(P<0.01);对照组各指标无明显变化(P>0.05)。结论:负压对缺血肢体血流动力学表现为流速增加,阻力下降。 相似文献
54.
彩色多普勒超声在精索扭转诊断和鉴别诊断中的价值 总被引:8,自引:1,他引:7
目的 :应用彩色多普勒超声鉴别精索扭转和急性睾丸炎。 方法 :回顾性分析 13例急性睾丸疼痛病人的彩色多普勒血流显像 (CDFI)表现和治疗情况。 结果 :8例显示睾丸内血流信号稀疏或消失 ,诊断为精索扭转 ,其中 1例手法复位成功 ,7例手术探查并得以证实。其余 5例显示患侧睾丸血流信号丰富 ,诊断为急性睾丸炎或睾丸附睾炎 ,经抗生素治疗后症状好转 ,超声复查显示血流减少。 结论 :CDFI在精索扭转诊断和鉴别诊断中具有重要意义 ,可作为急性睾丸疼痛病人的首选检查方法 相似文献
55.
William M. Chadduck H. Mark Crabtree James B. Blankenship James Adametz 《Child's nervous system》1991,7(1):27-30
Previous studies have demonstrated a high correlation between hydrocephalus and the resistive index (RI), as determined by transcranial Doppler ultrasonography. Measurements of RI, calculated by dividing the difference between the peak systolic velocity and the enddiastolic velocity by the peak systolic velocity, were attempted in 55 pediatric patients during evaluations for ventriculoperitoneal shunt malfunctions; values were obtained in 52. Indications of shunt malfunction included both clinical and radiographic evidence of increased intracranial pressure. Eleven patients, determined to have functional shunts both by clincal criteria and subsequent outcome, had RIs of 47±5 (average±1 standard deviation). Shunt malfunctions were confirmed in 41 patients. Prior to shunt revisions, these 41 patients has RIs of 71±10%; following revision, the RIs fell to 53±12%. Nine patients had had pre-malfunction RIs of 48±11% obtained during routine follow-ups; when they subsequently had shunt malfunctions, their RIs had significantly increased. Four of the 41 patients with shunt malfunctions had essentially normal RIs (52±7%), but had fluid tracking along the shunt; in these, RIs were essentially unaffected by shunt revision. For comparison, 119 pediatric patients with clinically functional ventriculoperitoneal shunts had RIs of 50±9%. The data, statistically significant with a P value of <0.001, showed a correlation between elevated RIs and shunt malfunction; thus, transcranial Doppler ultrasonography is a practical, non-invasive technique useful in the diagnosis of ventriculoperitoneal shunt malfunction.Presented at the Annual Meeting of the Pediatric Section of the American Association of Neurological Surgeons, Washington D.C., November 1989 相似文献
56.
大脑中动脉狭窄的TCD与DSA检查比较研究 总被引:1,自引:0,他引:1
目的 :通过大脑中动脉狭窄的TCD检查与DSA检查方法比较 ,为临床提供方便可靠的检查方法。方法 :对经TCD检查确诊为大脑中动脉狭窄 6 0例做DSA检查 ,对两种检查结果进行比较分析。结果 :经TCD确诊为大脑中动脉狭窄病例 ,病变侧狭窄处的血流速度(Vm)均明显高于健侧一倍以上 ,在动脉硬化性狭窄中多伴有“海鸥鸣”或“铁锅炒沙”样杂音 ,且频谱形态呈圆钝或脉动指数值增高的阻力波形。该 6 0例在DSA的检查中均出现不同部位的不同狭窄。结论 :TCD检查具有快速方便、安全、经济、确诊率高的优点 ,可作为脑血管病首选检查手段 相似文献
57.
S. Ohsaki S. Teraoka T. Tojimbara K. Takahasi H. Toma T. Agishi K. Ota 《Transplant international》1992,5(Z1):S100-S103
Prostaglandin E1 (PGE1) was used in renal transplant recipients with living related donors. The drug was given intravenously from day 1 to day 7 after transplantation at a dose of 40 µg/kg twice a day. A total of 45 patients were studied divided into two groups: 25 patients were treated with PGE1 (group B) and the remaining 20 patients did not receive the drug (group A). In group B, 24-h creatinine clearance (Ccr) was 66 ± 12.8 ml/min compared with 40.3 ± 13.4 ml/min in group A on the fifth postoperative day (P < 0.05). Urinary levels of N-acetyl-β-d -glucosaminidase (NAG) and serum levels of platelet factor 4 (PF4) in group B were significantly lower than in group A. On the fourth postoperative day, the urinary excretion of thromboxan B2 (TxB2) in group A was higher than in group B, but not significantly (5.1 ± 3.0 ng/day and 2.8 ± 1.1 ng/day, respectively). Acute rejection occurred in four patients in group B and in 10 patients (40%) in group A. The percentage of Leu2a-positive lymphocytes in group B was higher than in group A. We conclude that postoperative administration of PGE1 improves graft function in kidneys from living related donors. 相似文献
58.
彩色多普勒超声和二维超声心动图并用,不仅可观察和了解心脏解剖、形态及腔室大小,又能观察血流动力学改变。我们从1991年11月至1992年11月间应用上述方法诊断先天性心脏病共18例,均经我院和外院手术证实:室间隔缺损7例;房间隔缺损6例;动脉导管未闭5例,其中1例误诊为肺动脉瓣狭窄,诊断准确率达94.4%。我们认为彩色多普勒诊断先天性心脏病方法安全,准确无损伤,为临床及术前提供了较可靠的诊断依据,但检查者必须了解心脏及大血管的解剖关系,结合临床才能提高诊断准确率,减少漏、误诊的发生。 相似文献
59.
60.
Pathophysiological components of irritant contact dermatitis caused by 3 chemically-different irritants were investigated. 20 healthy volunteers were patch tested with sodium lauryl sulphate, nonanoic acid and hydrochloric acid on the flexor side of the upper arm. The skin response was evaluated after 24, 48 and 96 h by visual scoring and measured by the following bioengineering methods: transepidermal water loss measurement, electrical conductance for measurement of skin hydration, laser Doppler flowmetry for measurement of cutaneous blood flow and 20 MHz ultrasound A-scan for measurement of skin thickness. In spite of homogeneous inflammatory responses, significant differences in the severity of the injury to the skin barrier function caused by the different irritants were found. Also significant differences between irritants were found in the time course of development of maximum irritant reactions. Bioengineering methods indicating inflammatory responses (measurement of blood flow and skin thickness) were helpful in quantifying the irritant response in general, while bioengineering methods indicating epidermal damage (measurement of TEWL and electrical conductance) were helpful in classifying the individual irritants. 相似文献