全文获取类型
收费全文 | 39706篇 |
免费 | 2177篇 |
国内免费 | 121篇 |
专业分类
耳鼻咽喉 | 458篇 |
儿科学 | 2291篇 |
妇产科学 | 791篇 |
基础医学 | 5210篇 |
口腔科学 | 842篇 |
临床医学 | 2797篇 |
内科学 | 7994篇 |
皮肤病学 | 896篇 |
神经病学 | 2181篇 |
特种医学 | 869篇 |
外科学 | 5320篇 |
综合类 | 1432篇 |
一般理论 | 19篇 |
预防医学 | 2425篇 |
眼科学 | 1657篇 |
药学 | 3927篇 |
中国医学 | 337篇 |
肿瘤学 | 2558篇 |
出版年
2023年 | 262篇 |
2022年 | 733篇 |
2021年 | 1251篇 |
2020年 | 706篇 |
2019年 | 943篇 |
2018年 | 1166篇 |
2017年 | 796篇 |
2016年 | 1033篇 |
2015年 | 1091篇 |
2014年 | 1468篇 |
2013年 | 1965篇 |
2012年 | 2676篇 |
2011年 | 2707篇 |
2010年 | 1530篇 |
2009年 | 1354篇 |
2008年 | 1973篇 |
2007年 | 1923篇 |
2006年 | 1972篇 |
2005年 | 1552篇 |
2004年 | 1534篇 |
2003年 | 1294篇 |
2002年 | 1129篇 |
2001年 | 911篇 |
2000年 | 957篇 |
1999年 | 785篇 |
1998年 | 347篇 |
1997年 | 237篇 |
1996年 | 236篇 |
1995年 | 233篇 |
1994年 | 193篇 |
1993年 | 164篇 |
1992年 | 547篇 |
1991年 | 451篇 |
1990年 | 470篇 |
1989年 | 451篇 |
1988年 | 393篇 |
1987年 | 388篇 |
1986年 | 376篇 |
1985年 | 358篇 |
1984年 | 286篇 |
1983年 | 245篇 |
1979年 | 260篇 |
1978年 | 165篇 |
1977年 | 200篇 |
1976年 | 152篇 |
1975年 | 181篇 |
1974年 | 199篇 |
1973年 | 197篇 |
1972年 | 189篇 |
1971年 | 173篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
G Allen R Klingman V A Ferraris H Fisher F Harte A Singh 《The Journal of cardiovascular surgery》1991,32(6):833-836
Renal cell carcinomas may extend into the vena cava and the tumor thrombus occasionally involves the right atrium. The operative approach depends upon precise preoperative and intraoperative staging and thrombus localization. We report a case of renal cell carcinoma with complete inferior vena caval and hepatic vein occlusion with tumor extension into the right atrium. Preoperatively, transesophageal echocardiography provided superior images of the tumor and its extension, and intraoperatively allowed continuous monitoring of cardiac function and the removal of tumor from the atrium and inferior vena cava. Its use obviated the need for more costly and invasive preoperative and intraoperative procedures. 相似文献
32.
33.
Pratipal Singh Vivek Vijjan Manu Gupta Deepak Dubey Aneesh Srivastava 《International journal of urology》2007,14(6):558-560
Congenital thoracic ectopic kidney is a very rare developmental anomaly and the rarest form of all ectopic kidneys. It is usually asymptomatic and discovered incidentally on routine chest radiography. Herein we reported the first case of staghorn stone in a thoracic kidney managed successfully by percutaneous nephrolithotomy. 相似文献
34.
Akshay Pratap Devendra Kumar Gupta Chandra Shekhar Agrawal Rakesh Kumar Pandit Shailesh Adhikary Anand Kumar Awadhesh Tiwari Satyendra Narayan Singh 《International journal of urology》2007,14(3):198-202
OBJECTIVES: We analyzed the methods and outcomes of urethroplasty in men with complex urethral disruptions. METHODS: The medical records of 40 men with complex urethral disruptions were analyzed. Surgical methods were individualized according to stricture location, severity and length of the stricture, bladder neck characteristics and presence of complicating factors. Patients were divided into four groups based on the above characteristics. RESULTS: End-to-end urethroplasty performed in six patients with short bulbar strictures (<3 cm) was successful in all. Elaborated perineal repair was performed in 10 patients with intermediate (3-6 cm) strictures with or without complicating factors. Elaborated perineal repair with urethral substitution was performed in nine patients with long segment stricture (>6 cm). Abdominal transpubic repair was successfully applied to patients with rectourethral fistula or lacerated bladder neck. Success rate of anastomotic urethroplasty was 95% while over all success rate was 85%. CONCLUSION: Guidelines for urethral reconstruction of complex urethral disruptions are predicated on stricture length, location, bladder neck characteristics and associated complicating factors. End-to-end urethroplasty with stricture excision is highly reliable for short strictures for which previous operative repair have failed. Elaborated perineal repair is extremely versatile for intermediate and longer strictures with associated complicating factors. Abdominal transpubic urethroplasty is effective for patients with rectourethral fistula or lacerated bladder neck. 相似文献
35.
S. A. R. Nouraei C. B. Singh M. S. Ferguson K. Young D. Roy J. M. Philpott 《European journal of plastic surgery》2007,30(4):153-157
The objective of this study is to assess the results of repairing septal perforations with a vascularized pedicled alar cartilage
island flap. Using the external rhinoplasty approach, a vascularized flap of alar cartilage, harvested as a cephalic trim
and pedicled on the ascending columellar branches of the superior labial artery was raised. Bilateral mucoperichondrial septal
flaps were elevated and the alar flap was transposed and secured within the defect and bilaterally overlaid with temporalis
fascia. Silastic sheets were placed and remained in situ until the grafts were revascularized from the peripheries of the
defect as well as centrally from the alar flap. The revascularized temporalis fascia acted as a scaffold for nasal remucosalization.
The alar flap also increased the long-term structural robustness of the repair. Between 1999 and 2003, 14 patients with septal
perforations ranging from 10 to 31 mm underwent septal reconstruction using this technique. There were nine males and five
females. The flap was successfully raised in all cases and long-term closure was maintained in 12 patients (86%). The alar
cartilage flap is an effective technique for repairing septal perforations in selected patients. It provides vascularized
tissue which nourishes the grafts during remucosalization, and a cartilaginous framework, which affords long-term structural
support to the repair. It also obviates the need to transpose nasal mucosa and create a secondary defect. The rhinoplasty
approach furthermore permits additional nasal deformities to be corrected at the same time.
Presented at the British Association of Plastic Surgeons Summer Scientific Meeting, Sheffield, UK (12 July 2006). 相似文献
36.
37.
Harbhej Singh Jay Yang Katina Thornton Adolph H. Giesecke 《Journal canadien d'anesthésie》1995,42(11):987-991
The purpose of investigation was to study the effect of intrathecal fentanyl on the onset and duration of hyperbaric bupivacaine-induced spinal block in adult male patients. Fortythree patients undergoing lower extremity or genitourinary surgery were enrolled to receive either 13.5 mg hyperbaric bupivacaine 0.75% + 0.5 ml CSF it, (Group I) or 13.5 mg hyperbaric bupivacaine 0.75% + 25 μg fentanyl it, (Group II) according to a randomized assessor-blind protocol. The onset and duration of sensory block were assessed by pinching the skin with forceps in the midclavicular line bilaterally every two minutes for first twenty minutes and then every five to ten minutes. Similarly, the onset and duration of motor block were assessed and graded at the same time intervals using the criteria described by Bromage. The time required for two sensory segment regression and sensory regression to L1 dermatome was 74 ± 18 and 110 ± 33 min vs 93 ± 22 and 141 ± 37 min in Groups I and II, respectively (P < 0.05). Intrathecal fentanyl did not enhance the onset of sensory or motor block, or prolong the duration of bupivacaine-induced motor spinal block. Fewer patients demanded pain relief in the fentanyl-treated group than in the control group in the early postoperative period (19% vs 59%; P < 0.05). Episodes of hypotension were more frequent in the fentanyl-treated group than in the control group (43% vs 14%; P < 0.05). We conclude that fentanyl, 25 μg it, prolonged the duration of bupivacaine-induced sensory block (sensory regression to L1 dermatone) by 28% and reduced the analgesic requirement in the early postoperative period following bupivacaine spinal block. 相似文献
38.
39.
Maximal oxygen consumption (VO2max) and maximal workload attained (WLmax) were determined in 28 Malaysian dragon boat rowers who were exercised to exhaustion on an arm ergometer. Mean VO2max was 2.75 l min-1 at a mean WLmax of 195.5 W. Anaerobic endurance power of the arms, determined by cranking at 100 RPM at a workload of 400 W and the time taken to maintain the cadence until it fell to 75 RPM, was 34.9(+/- 2.3) s. Leg performance, as determined by standing long jump and vertical jump, was 140.0(+/- 4.5) kg m and 100.3(+/- 3.1) kg m s-1 respectively. Right hand grip strength was significantly (p < 0.001) greater than the left hand. Percentage body fat of the rowers was 11.8(+/- 0.6)%. These values represent the first measurements of their kind performed on dragon boat rowers in Malaysia. 相似文献
40.
The pulmonary intravascular macrophages (PIMs) have been described in several species of animals. This study demonstrates for the first time that the equine lung has PIMs as resident phagocytes in its microvasculature. Their salient features such as globular surface coat, structures of the endocytic pathway, and related cell organelles closely resemble those of the calf, goat, and sheep. The exquisite organization of the coat globules in the form of a linear chain was structurally similar to the lipolytic lipase and the heparin-sensitive globular coat from PIMs of calf, goat, and sheep. Monastral blue (MB) when employed as a tracer to assess the phagocytic properties of equine PIMs induced similar modification of the globules of the coat into lipid droplets, reminiscent of neutral lipids. Lipids droplets (modified coat globules) were delivered into acid phosphatase-positive endosomes and lysosomes. Concurrently, the unaltered globules of the coat, probably internalized via fluid-phase constitutive pinocytoses, followed a different endocytic pathway. Large-scale platelet uptake by the PIMs was observed with thrombocytopenia in MB-treated ponies. The possible significance of hypothetical LDL-coat and the endocytic organelles as equivalents of synthetic apparatus of vasoactive lipids in the PIMs of horse needs to be assessed in future studies. 相似文献