全文获取类型
收费全文 | 14487篇 |
免费 | 1146篇 |
国内免费 | 41篇 |
专业分类
耳鼻咽喉 | 104篇 |
儿科学 | 458篇 |
妇产科学 | 467篇 |
基础医学 | 1958篇 |
口腔科学 | 201篇 |
临床医学 | 1766篇 |
内科学 | 2870篇 |
皮肤病学 | 426篇 |
神经病学 | 1419篇 |
特种医学 | 321篇 |
外国民族医学 | 1篇 |
外科学 | 1515篇 |
综合类 | 167篇 |
一般理论 | 12篇 |
预防医学 | 1724篇 |
眼科学 | 256篇 |
药学 | 956篇 |
1篇 | |
中国医学 | 29篇 |
肿瘤学 | 1023篇 |
出版年
2023年 | 158篇 |
2022年 | 308篇 |
2021年 | 604篇 |
2020年 | 336篇 |
2019年 | 511篇 |
2018年 | 555篇 |
2017年 | 391篇 |
2016年 | 346篇 |
2015年 | 391篇 |
2014年 | 571篇 |
2013年 | 819篇 |
2012年 | 1139篇 |
2011年 | 1121篇 |
2010年 | 599篇 |
2009年 | 546篇 |
2008年 | 862篇 |
2007年 | 928篇 |
2006年 | 817篇 |
2005年 | 765篇 |
2004年 | 704篇 |
2003年 | 645篇 |
2002年 | 499篇 |
2001年 | 156篇 |
2000年 | 116篇 |
1999年 | 136篇 |
1998年 | 98篇 |
1997年 | 71篇 |
1996年 | 63篇 |
1995年 | 73篇 |
1994年 | 54篇 |
1993年 | 55篇 |
1992年 | 100篇 |
1991年 | 82篇 |
1990年 | 81篇 |
1989年 | 89篇 |
1988年 | 68篇 |
1987年 | 61篇 |
1986年 | 46篇 |
1985年 | 65篇 |
1984年 | 62篇 |
1983年 | 57篇 |
1982年 | 55篇 |
1981年 | 35篇 |
1980年 | 39篇 |
1979年 | 39篇 |
1978年 | 37篇 |
1977年 | 35篇 |
1976年 | 21篇 |
1974年 | 25篇 |
1973年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Juan M. Verdeguer M.D. Dolores Ramon M.D. Manuel Moragon M.D. Isabel Betlloch M.D. Esperanza Jorda M.D. M.D Victoria Planelles M.D. † 《Pediatric dermatology》1988,5(1):56-57
Abstract: Hydantoin is an anticonvulsant drug with several side effects. A teralogenic potential has been suggested. The fetal hydantoin syndrome is an entity that consists of a broad range of morphologic and developmental disorders in children born of epileptic mothers exposed to hydantoin during pregnancy. We treated a girl in whom onychopathy was a monosymptomatic or mild form of this syndrome. 相似文献
22.
Bilateral six-hydroxydopamine (6-OHDA) lesions were placed in the amygdala of rats self-administering cocaine (1.5 mg/kg per injection i.v.) under a progressive ratio schedule of reinforcement. Post-lesion access to three doses of cocaine (1.5, 0.75 and 0.37 mg/kg per injection i.v.) revealed a lesion effect only at the highest dose. At this dose, the lesion caused a significant increase in breaking point. No change in the breaking point was produced at the lower two doses. The biochemical results show a significant reduction in dopamine and DOPAC levels within the amygdala and an increase in dopamine within the NACC. In contrast, noradrenaline and serotonin (5-HT) levels were unaffected by the lesion in any of the dissected areas. These results demonstrate that no specific effect on cocaine reinforcement was produced by 6-OHDA lesions of the amygdala. The possibility that the lesion may have attenuated the anxiogenic qualities of the high dose of cocaine is discussed. 相似文献
23.
Anucha Apisarnthanarak Somwang Danchaivijitr Thomas C Bailey Victoria J Fraser 《Infection control and hospital epidemiology》2006,27(4):416-420
The incidence and patterns of and factors associated with inappropriate antibiotic use were studied in a tertiary care center in Thailand. The incidence of inappropriate antibiotic use was 25%. Admission to the surgical department (adjusted odds ratio, 2.0; P=.02) and to the obstetrics and gynecology department (adjusted odds ratio, 2.0; P=.03) were associated with inappropriate antibiotic use, whereas consultation with an infectious diseases specialist was protective against inappropriate antibiotic use (adjusted odds ratio, 0.15; P=.01). 相似文献
24.
25.
Guo-Wei Ma Martin Pytel Ana Luisa Trejos Victoria Hornblower Jennifer Smallwood Rajni Patel Aaron Fenster Richard A Malthaner 《Computer aided surgery》2007,12(5):270-277
OBJECTIVE: Interstitial brachytherapy is becoming an accepted treatment option for lung cancer patients for whom surgery poses a high risk. Robotic surgery has the potential to deliver brachytherapy seeds into tumors while keeping surgeons at a safe distance from the radioactive source. Our aim was to compare the accuracy, number of attempts, and time needed to place seeds next to a target when using a manual technique, video-assisted thoracoscopic surgery (VATS), and the ZEUS robot for minimally invasive surgery (MIS). METHODS: A brachytherapy seed injector was developed and attached to one of the ZEUS robotic arms. Four subjects each inserted inactive dummy brachytherapy seeds into clear agar-gelatin cubes containing a 1.6-mm stainless steel ball target. Two orthogonal radiographs were taken of each agar cube, and the corresponding distances were measured in triplicate using ImageJ processing software. The mean distance between the center of each seed and the corresponding target was calculated using the Pythagorean theorem. Comparisons were made using analysis of variance, t-tests, and Kruskal-Wallis tests, as appropriate. RESULTS: A total of 384 tests (128 for each technique) were performed. The median accuracies for the manual technique, VATS, and ZEUS were 1.8 mm (range: 0.9-6.7 mm), 2.4 mm (range: 1.0-11.3 mm), and 3.6 mm (range: 1.3-16.7 mm), respectively (p < 0.01). The median numbers of attempts for the manual technique, VATS, and ZEUS were 1 (range: 1-5), 4 (range: 1-14), and 3 (range: 1-20), respectively (p < 0.01). The median times for the manual technique, VATS, and ZEUS were 3.0 s (range: 1-43 s), 86.5 s (range: 6-372 s), and 64.5 s (range: 5-356 s), respectively (p < 0.01). CONCLUSIONS: The manual technique is the most accurate, least traumatic, and fastest method of inserting seeds into tumors. The ZEUS robotic platform was able to place seeds beside a target within a clinically acceptable distance, with an acceptable amount of trauma and time required. It achieved results equal to or better than those obtained with VATS. 相似文献
26.
27.
Anucha Apisarnthanarak Marilyn Jones Brian M Waterman Cathy M Carroll Robert Bernardi Victoria J Fraser 《Infection control and hospital epidemiology》2003,24(1):31-36
OBJECTIVE: To characterize risk factors for surgical-site infection after spinal surgery. DESIGN: A case-control study. SETTING: A 113-bed community hospital. METHOD: From January 1998 through June 2000, the incidence of surgical-site infection in patients undergoing laminectomy, spinal fusion surgery, or both increased at community hospital A. We compared 13 patients who acquired surgical-site infections after laminectomy, spinal fusion surgery, or both with 47 patients who were operated on during the same time period but did not acquire a surgical-site infection. Information collected included demographics, risk factors, personnel involved in the operations, length of hospital stay, and hospital costs. RESULTS: Of 13 case-patients, 9 (69%) were obese, 9 (69%) had spinal compression, 5 (38.5%) had a history of tobacco use, and 4 (31%) had diabetes. Oxacillin-sensitive Staphylococcus aureus (6 of 13; 46%) was the most common organism isolated. Significant risk factors for postoperative spinal surgical-site infection were dural tear during the surgical procedure and the use of glue to cement the dural patch (3 of 13 [23%] vs 1 of 47 [2.1%]; P = .02) and American Society of Anesthesiologists risk class of 3 or more (6 of 13 [46.2%] vs 7 of 47 [15%]; P = .02). Case-patients were more likely to have prolonged length of stay (median, 16 vs 4 days; P< .001). The average excess length of stay was 11 days and the excess cost per case was $12,477. CONCLUSION: Dural tear and the use of glue should be evaluated as potential risk factors for spinal surgical-site infection. Systematic observation for potential lapses in sterile technique and surgical processes that may increase the risk of infection may help prevent spinal surgical-site infection. 相似文献
28.
Does increased intracranial pressure in patients with pseudotumour cerebri PTC result in cognitive impairments The results of previous investigations have not clarified this question It may be that there is a subgroup within those diagnosed with PTC that does experience cognitive decline with increased intracranial pressure However elevated intracranial pressure headache and emotional distress also can contribute to reduced cognitive performance and increased self monitoring As a result of the lack of clarity regarding the impact of PTC on cognition clinicians are left with no empirically derived practice guidelines A case study demonstrates subjective complaints of concentration and memory deficits in a depressed patient with PTC whose neuropsychological stores except Seashore Rhythm Test were in the normal range 相似文献
29.
30.