全文获取类型
收费全文 | 86058篇 |
免费 | 5589篇 |
国内免费 | 314篇 |
专业分类
耳鼻咽喉 | 1338篇 |
儿科学 | 3852篇 |
妇产科学 | 2874篇 |
基础医学 | 9817篇 |
口腔科学 | 3446篇 |
临床医学 | 7735篇 |
内科学 | 17652篇 |
皮肤病学 | 2369篇 |
神经病学 | 6869篇 |
特种医学 | 3009篇 |
外国民族医学 | 10篇 |
外科学 | 13605篇 |
综合类 | 1098篇 |
一般理论 | 47篇 |
预防医学 | 5824篇 |
眼科学 | 2038篇 |
药学 | 5320篇 |
4篇 | |
中国医学 | 568篇 |
肿瘤学 | 4486篇 |
出版年
2023年 | 701篇 |
2022年 | 836篇 |
2021年 | 1924篇 |
2020年 | 1333篇 |
2019年 | 1920篇 |
2018年 | 2986篇 |
2017年 | 2172篇 |
2016年 | 2388篇 |
2015年 | 2237篇 |
2014年 | 2835篇 |
2013年 | 4122篇 |
2012年 | 5968篇 |
2011年 | 6803篇 |
2010年 | 3476篇 |
2009年 | 2614篇 |
2008年 | 5274篇 |
2007年 | 5673篇 |
2006年 | 5384篇 |
2005年 | 5380篇 |
2004年 | 5276篇 |
2003年 | 4792篇 |
2002年 | 4375篇 |
2001年 | 2060篇 |
2000年 | 2081篇 |
1999年 | 1428篇 |
1998年 | 686篇 |
1997年 | 537篇 |
1996年 | 444篇 |
1995年 | 341篇 |
1994年 | 315篇 |
1993年 | 310篇 |
1992年 | 421篇 |
1991年 | 378篇 |
1990年 | 313篇 |
1989年 | 271篇 |
1988年 | 297篇 |
1987年 | 232篇 |
1986年 | 241篇 |
1985年 | 213篇 |
1984年 | 256篇 |
1983年 | 215篇 |
1982年 | 195篇 |
1981年 | 152篇 |
1980年 | 169篇 |
1979年 | 201篇 |
1978年 | 182篇 |
1977年 | 153篇 |
1975年 | 134篇 |
1974年 | 126篇 |
1973年 | 151篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
51.
Meral T. Ercan Nedim C. M. Gülaldi Işil S. Ünsal Mehmet Aydin İrfan Peksoy Zafer Hasçelik 《Annals of nuclear medicine》1996,10(4):419-423
The present study evaluated99mTc(V) DMSA as an agent for the visualization of inflammatory lesions in comparison to99mTc(HI) DMSA and99mTc-HIG. All three radiopharmaceuticals were prepared with commercial kits.99mTc(V) DMSA was prepared at neutral pH by the addition of first bicarbonate and then pertechnetate to the kit contents. The labeling efficiency was 99% as determined by ITLC. Abscesses were induced by i.m. injection of 50 μl turpentine into the right thighs of 36 Swiss albino mice. Six days later 3.7 MBq of each radiopharmaceutical was i.v. administered to 12 mice. The mice were sacrificed at 1,3,6 and 24 h later. Scintigrams were obtained with a gamma camera. The abscesses were better visualized on scintigrams with99mTc(V) DMSA compared to99mTc(III) DMSA, starting at 1 h. The animals were dissected and the organs were removed, weighed and the radioactivity determined with a gamma counter. The abscess to other tissue ratios were higher with99mTc(V) DMSA than the other radiopharmaceuticals. The max. abscess/muscle ratios were 9.46 ± 3.20 (24 h), 4.19 ± 1.39 (6 h) and 5.98 ± 1.17 (24 h) and max. abscess/blood ratios were 6.22 ± 1.41, 4.09 ± 0.84 and 0.914 ± 0.351 all at 24 h for99mTc(V) DMSA,99mTc(III) DMSA and99mTc-HIG, respectively. Experimental arthritis was produced in 6 New Zealand white rabbits by intra-articular injection of ovalbumin. Four days later 37 MBq of99mTc(V) DMSA and99mTc-HIG were each i.v. administered to 3 rabbits. Scintigrams obtained at 1, 3, 6, and 24 h clearly demonstrated arthritic joints. ROFs over arthritic joints were compared to contralateral normal joints (A/C). The max. A/C ratios were 2.10 ± 0.31 (3 h) and 2.92 ± 0.99 (24 h) for99mTc(V) DMSA and99mTc-HIG, respectively. Our results indicated the feasibility of imaging inflammatory lesions with99mTc(V) DMSA. 相似文献
52.
B. J. d'Othe S. Haulon C. Mounier-Vehier J. P. Beregi O. Jabourek S. Willoteaux 《European journal of vascular and endovascular surgery》2002,24(6):516-523
OBJECTIVE: evaluation and comparison of the endovascular treatment of isolated aortic and aortoiliac atherosclerotic lesions (stenoses and occlusions). METHODS: a percutaneous endovascular procedure was performed in 52 patients (38 men and 14 women) with a mean age of 52 years (range, 25-85 years). The baseline angiogram showed 35 aortic lesions (31 stenoses, 4 occlusions) and 17 aortoiliac lesions (14 stenoses, 3 occlusions). Percutaneous techniques used in this series included variable combinations of transluminal angioplasty and stenting. All stents placements were performed over-the-wire using the transfemoral route (most often bilateral approach). Clinical examination and Duplex-scan were performed at discharge, 1 month, 6 months, 12 months, and then yearly. RESULTS: technical success was 100% for aortic and aortoiliac lesions. Angiographic success rates were comparable for aortic (91%) and aortoiliac (94%) lesions. No death occurred during or early after the endovascular intervention. Duplex-scan confirmed 100% patency rate at discharge. There was no significant difference between the aortic (94%) and aortoiliac (96%) groups regarding immediate clinical improvement. Mean follow-up was 34+/-31 months (range, 0-130 months). The cumulative primary patency rate at 36 months was 85% in the aortic group and 86% in the aortoiliac group. Clinical success, defined as a symptom-free status at the end of follow-up, was also similar in both groups. CONCLUSION: endovascular treatment of isolated aortic lesions of the infra-renal aorta has favorable outcomes comparable to those of aortoiliac lesions. 相似文献
53.
Stoma Adjustable Silicone Gastric Banding versus Vertical Banded Gastroplasty for the Treatment of Morbid Obesity 总被引:1,自引:0,他引:1
Background: Among gastric restrictive operations, the procedure of choice is still controversial. The aim of this study is
to compare the results of two different gastric restrictive procedures: vertical banded gastroplasty (VBG) and stoma adjustable
silicone gastric banding (ASGB). Methods: Between 1991 and 1996, 51 patients were treated surgically for morbid obesity: 27
underwent VBG and 24 underwent ASGB. Preoperative body weight (BW), body mass index (BMI) and percentage of ideal body weight
(% IBW) were (mean ± SD): 145.7 ± 45.3 kg; 53.9 ± 15.9 kg/m2; 249.1 ± 73.5% respectively in the VBG group. Corresponding figures for the ASBG group were 132.5 ± 22.7 kg; 46.9 ± 7.8 kg/m2 and 207.2 ± 35.0%. Results: In the VBG group, the median follow-up period was 26 months (range: 7-47). Eighteen months after
the operation BW, BMI, % IBW and percentage of excess weight loss (% EWL) were 85.5 ± 26.8 kg, 31.9 ± 9.8 kg/m2, 145.4 ± 43.9% and 74 ± 1% respectively. Complications included incisional hernia (n = 1), and bowel obstruction (n = 1).
One patient died of acute myocardial infarction on the third postoperative day. In the ASGB group, median follow-up time was
19.7 months (range: 18-26). At 18 months postoperation BW, BMI, % IBW and % EWL values were 86.6 ± 20.6 kg 30.6 ± 6.6 kg/m2
140.6 ± 29.3% and 64 ± 1% respectively. Gastric wall erosion occurred in two patients and the bands had to be removed. These
patients underwent VBG 6 months later. Complications encountered in this group were incisional hernia (n = 1), outlet stenosis
and reflux esophagitis (n = 1), reservoir leakage (n = 1) and gastrointestinal bleeding (n = 1). Two patients died of pulmonary
embolism and acute gastrointestinal bleeding. Conclusions: Weight reduction was not statistically significant between the
two groups. ASGB was easier to perform and less invasive than VBG. 相似文献
54.
T. M. Skerry M.D. M.R.C.V.S. R. Suswillo A. J. El Haj N. N. Ali R. A. Dodds L. E. Lanyon 《Calcified tissue international》1990,46(5):318-326
Summary Previous studies of Alcian blue-induced birefringence in adult avian cortical bone showed that a short period of intermittent
loading rapidly produces an increased level of orientation of proteoglycans within the bone tissue. In the absence of further
loading, this persists for over 24 hours. We have proposed that this phenomenon could provide a means for “capturing” the
effects of transient strains, and so provide a persistent, constantly updated strain-related influence on osteocyte populations
related to the bones' averaged recent strain history, in effect, a “strain memory” in bone tissue. In our present study, we
use the Alcian blue-induced birefringence technique to demonstrate that proteoglycan orientation also occurs after intermittent
loading of both cortical and cancellous mammalian bonein vivo andin vitro. We also show that the change in birefringence is proportional to the magnitude of the applied strain, and that the reorientation
occurs rapidly, reaching a maximal value after only 50 loading cycles. Examination of electron micrographs of bone tissue
after staining with cupromeronic blue allows direct visualization and quantification of the change in proteoglycan orientation
produced by loading. This shows that intermittent loading is associated with a realignment of the proteoglycan protein cores,
bringing them some 5 degrees closer to the direction of collagen fibrils in the bone matrix. 相似文献
55.
56.
Comparison of local and general anesthesia in tension-free (Lichtenstein) hernioplasty: a prospective randomized trial 总被引:3,自引:0,他引:3
To compare pulmonary effects, postoperative pain and fatigue, morbidity, patient satisfaction, and cost of different anesthetic
techniques for inguinal hernia repair, 50 patients were randomized to local and general anesthesia groups (LA and GA). All
patients received the same premedications and the same postoperative analgesic regimen. The standardized postoperative analgesic,
intramuscular pyroxicam 20 mg, was given to all patients in the recovery room and an additional 20 mg on the same day was
given as requested by each patient. Pulmonary function studies and arterial blood gas analysis were performed 1 h prior to
the operation and at the postoperative 8th and 24th hours. All patients underwent Lichtenstein's tension-free hernioplasty.
Postoperative pain and fatigue were registered 8 h and 24 h after the operation. A questionnaire was filled out by the patients,
and they were asked to give grades for the general comfort of the anesthesia and the surgical procedure (1=worst, 10=best).
Postoperative pulmonary function tests were significantly poorer in the GA group both on 8th- and 24th-hour measurements (P<0.05). Patients who underwent LA had significantly lower PCO2 and higher PO2 at the postoperative 8th hour (P<0.05). Mean postoperative pain and fatigue scores revealed a significant difference in favor of local anesthesia at only
the 8th hour (P<0.05). There were two complications, one in each group (a hematoma in LA and a urinary retention in GA). Patient satisfaction
grades were not different in the two groups. We conclude that LA in inguinal hernia repair does not adversely affect pulmonary
functions, patients feel less pain, and patient satisfaction is comparable to that with GA.
Electronic Publication 相似文献
57.
58.
53例呼吸机相关肺炎病原学与临床分析 总被引:5,自引:3,他引:2
目的分析呼吸机相关肺炎(VAP)的病原学以及药物敏感情况.方法回顾分析1994年4月~2002年5月收治的53例VAP患者的临床资料、病原菌构成以及药敏试验结果. 结果 VAP的发生率为51.5%,共培养出细菌79株,真菌34株;其中革兰阴性杆菌70株,革兰阳性球菌9株,VAP居首位的细菌是铜绿假单胞菌.结论 VAP感染的细菌以革兰阴性杆菌为主,VAP发生后细菌的耐药率普遍较高,在治疗VAP时应重视病原菌培养和药敏试验结果,合理应用抗生素. 相似文献
59.
Disposition and hypoglycaemic action of glipizide in diabetic patients given a single dose of nifedipine 总被引:4,自引:0,他引:4
A. A. Connacher A. H. El Debani T. E. Isles I. H. Stevenson 《European journal of clinical pharmacology》1987,32(1):81-83
Summary Adrenaline, when administered in dental local anaesthetic solutions, significantly reduces the plasma potassium concentration in young healthy adults. This effect occurs within 10 min of extravascular injections into the maxillary buccal sulcus and may influence the choice of local anaesthetic solution for patients receiving kaliuretic diuretics. 相似文献
60.