全文获取类型
收费全文 | 29373篇 |
免费 | 1402篇 |
国内免费 | 170篇 |
专业分类
耳鼻咽喉 | 319篇 |
儿科学 | 920篇 |
妇产科学 | 577篇 |
基础医学 | 3591篇 |
口腔科学 | 906篇 |
临床医学 | 2072篇 |
内科学 | 7477篇 |
皮肤病学 | 447篇 |
神经病学 | 2703篇 |
特种医学 | 1091篇 |
外科学 | 4706篇 |
综合类 | 104篇 |
一般理论 | 11篇 |
预防医学 | 1713篇 |
眼科学 | 346篇 |
药学 | 1671篇 |
中国医学 | 92篇 |
肿瘤学 | 2199篇 |
出版年
2023年 | 227篇 |
2022年 | 497篇 |
2021年 | 939篇 |
2020年 | 525篇 |
2019年 | 801篇 |
2018年 | 1005篇 |
2017年 | 669篇 |
2016年 | 712篇 |
2015年 | 862篇 |
2014年 | 1145篇 |
2013年 | 1415篇 |
2012年 | 2250篇 |
2011年 | 2215篇 |
2010年 | 1340篇 |
2009年 | 1152篇 |
2008年 | 1893篇 |
2007年 | 1866篇 |
2006年 | 1814篇 |
2005年 | 1672篇 |
2004年 | 1460篇 |
2003年 | 1353篇 |
2002年 | 1300篇 |
2001年 | 391篇 |
2000年 | 364篇 |
1999年 | 323篇 |
1998年 | 230篇 |
1997年 | 208篇 |
1996年 | 188篇 |
1995年 | 175篇 |
1994年 | 140篇 |
1993年 | 132篇 |
1992年 | 143篇 |
1991年 | 131篇 |
1990年 | 140篇 |
1989年 | 115篇 |
1988年 | 112篇 |
1987年 | 94篇 |
1986年 | 98篇 |
1985年 | 77篇 |
1984年 | 86篇 |
1983年 | 61篇 |
1982年 | 65篇 |
1981年 | 44篇 |
1980年 | 53篇 |
1979年 | 46篇 |
1978年 | 45篇 |
1977年 | 34篇 |
1975年 | 29篇 |
1973年 | 33篇 |
1970年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Peter Y. Kim M.D. Bradley J. Monk M.D. Sanjay Chabra B.S. Robert A. Burger M.D. Steven A. Vasilev M.D. Alberto Manetta M.D. Philip J. DiSaia M.D. Michael L. Berman M.D. 《Gynecologic oncology》1998,69(3):243-247
Cervical carcinoma frequently metastasizes to the paraaortic region, necessitating extended field radiotherapy to effect a cure. As imaging modalities are unreliable in identifying all cases of paraaortic nodal metastases (PAN), surgical staging is often utilized prior to radiotherapy. This study was aimed at identifying factors predictive of survival in women with cervical carcinoma and paraaortic metastases. In particular, survival based on extent of paraaortic disease was examined. The study group consisted of 43 women (stages IB–IVB) identified between 1982 and 1993 who were treated with extended field radiation for cervical carcinoma with histologically confirmed paraaortic metastases. The estimated 5-year survival for the study population was 24% with a median survival of 18 months. Pelvic tumor size had a significant impact on survival with the median survival being 34 months if the primary lesion was <6 cm compared to 14 months if ≥6 cm (P= 0.01). Eight of the 26 (31%) women without residual PAN disease after surgical staging remain alive and disease free (mean follow-up, 74 months). In contrast, only 1 of the 17 (6%) women with gross residual PAN is alive 71 months after treatment (P= 0.05). However, a comparison of Kaplan–Meier survival curves did not show a statistically significant advantage to the surgical excision of grossly involved PAN (P= 0.98). Although long-term survival among women with grossly involved, unresected paraaortic metastases is uncommon, further study is necessary to elucidate the role of surgical excision of bulky aortic disease in women with cervical cancer. 相似文献
82.
Wolszon Laura R.; Pereda Alberto E.; Faber Donald S. 《Journal of neurophysiology》1997,78(5):2693-2706
83.
M S Asuero de Lis M Navarro Serrano M Rubial Alvarez J Pérez Pe?a N Molins Gauna 《Revista espa?ola de anestesiología y reanimación》1990,37(1):15-18
To evaluate the potential advantages of the administration of extradural morphine to control postoperative pain and its effects on respiratory function, 39 patients were randomly assigned to one of two groups before aortic surgery. The first group (20 patients) received intravenous analgesia as required (control group). The second group (19 patients) received extradural morphine in a programmed fashion. During the immediate postoperative period the following parameters were measured in both groups: respiratory rate, vital capacity, peak expiratory volume in the first second, PaO2, PaCO2, arterial pH, heart rate, and systolic and diastolic blood pressure. In the group treated with morphine the postoperative increase in heart and respiratory rate was significantly smaller than in the control group (p less than 0.01). Postoperative forced pulmonary volumes were higher in the morphine group (p less than 0.01). However, there were no differences in time of hospitalization between both groups. There were more complications in the control group, but the difference did not reach statistical significance. 相似文献
84.
85.
Association of HLA-DQA1*03011-DQB1*0301 haplotype with the development of respiratory scleroma. 总被引:1,自引:0,他引:1
Luis Alberto Sánchez-Marín Daniel Bross-Soriano José Arrieta Simón Kawa-Karasik Víctor Martínez-Vilchis Rocío Jiménez-Lucio Angélica Olivo-Díaz 《Otolaryngology--head and neck surgery》2007,136(3):481-483
OBJECTIVE: Respiratory scleroma (RS) is a progressive, chronic, granulomatous disease caused by Klebsiella rhinoscleromatis. There is only one report of RS association with HLA-DQ3. In this study, molecular association of HLA class II and RS was determined. STUDY DESIGN AND SETTING: Nine RS patients and 163 healthy controls were compared. DQA1, DQB1, and DRB1 loci were typed. RESULTS: Statistical analysis demonstrated association between DQB1*0301 and susceptibility to RS (P(c) = 0.004). Haplotype analysis showed an association of DQA1*03011-DQB1*0301 (P = 1.21E-19) and DRB1*0407-DQA1*03011-DQB1*0301 (P = 0.0002). CONCLUSIONS: Results established that DQA1*03011-DQB1*0301 haplotype is a strong risk factor for development of RS. 相似文献
86.
Ottavio Cavicchi Ottavio Piccin Umberto Caliceti Angelo De Cataldis Renato Pasquali Alberto Rinaldi Ceroni 《Otolaryngology--head and neck surgery》2007,137(4):654-658
OBJECTIVE: The purpose of this study was to identify the risk factors for postoperative transient hypoparathyroidism in a group of patients undergoing thyroid surgery. STUDY DESIGN: A prospective study was conducted on 604 patients undergoing thyroid surgery. SUBJECTS AND METHODS: Gender, final diagnosis, extent of resection, biology of pathology, intrathoracic involvement, surgery for recurrent multinodular goiter, and presence and number of parathyroid glands in a surgical specimen were analyzed as risk factors for postoperative transient hypoparathyroidism. The chi-square test and a logistic regression analysis were applied. RESULTS: On logistic regression analysis, only the extent of surgery constituted an independent variable for transient hypoparathyroidism (P = 0.001). CONCLUSION: The extent of surgery to central and/or lateral neck lymph nodes is responsible for a high rate of transient hypoparathyroidism owing to a high probability of unplanned parathyroidectomy or parathyroid gland devascularization. 相似文献
87.
88.
Simone Maurea Alberto Cuocolo Leonardo Pace Emanuele Nicolai Antonio Nappi Massimo Imbriaco Carmine Morisco Massimo Chiariello Bruno Trimarco Marco Salvatore 《European journal of nuclear medicine and molecular imaging》1993,20(6):502-510
To compare rest-injected thallium-201 (Tl) redistribution and resting technetium-99m methoxyisobutylisonitrile (99mTc-MIBI) myocardial uptake in chronic coronary artery disease (CAD), 15 patients with angiographically proven CAD and left ventricular (LV) dysfunction (ejection fraction 34%±9%) were studied. All patients underwent rest-redistribution Tl and resting 99mTc-MIBI cardiac imaging. Gated 99mTc-MIBI images were also acquired to assess regional LV wall motion (WM). Myocardial segments (n=225) were divided into three groups on the basis of the degree of coronary artery stenosis: group 1 (total occlusion, n=82), group 2 (50%–99% of stenosis, n=84) and group 3 (<50% of stenosis, n=59). WM was significantly worse in groups 1 and 2 compared to group 3 (P<0.001), but no difference was observed between groups 1 and 2. TI and 99mTc-MIBI uptake were significantly lower in groups 1 and 2 compared to group 3 (P < 0.001), and in group 1 compared to group 2 (P<0.001). When TI and 99mTc-MIBI uptake were directly compared, TI uptake was higher than 99mTc-MIBI uptake in group 1 (P<0.001), while no significant difference was observed in groups 2 and 3. Thus, both rest-injected TI redistribution and resting 99mTc-MIBI uptake reflected the severity of coronary artery stenosis in CAD. However, in myocardial segments with total coronary occlusion T1 uptake was significantly higher than 99mTc-MIBI uptake. Our data suggest that rest-injected Tl redistribution cardiac imaging may identify, more accurately than resting 99mTc-MIBI imaging, the presence of viable myocardium in chronic CAD, particularly when the coronary blood flow is severely impaired. 相似文献
89.
Effects of consuming toxic oils and oleoanilides on fat digestibility and adipose tissue composition of rats 总被引:1,自引:0,他引:1
An oil implicated in the Spanish "toxic syndrome" was studied for its effect on fat digestibility and adipose-tissue composition in rats. The effects produced by the mixture of oils and those induced by the presence of oleoanilides were assessed separately. For 4 wk, Wistar rats were fed diets containing either a mixture of oils similar to that constituting the toxic oil, the same mixture of oils supplemented with oleoanilides, or the toxic oil (which also contained oleoanilides) and were then compared with a group fed olive oil. Food consumption fluctuated sharply in the group fed the toxic oil, falling significantly in the last week of the study. The digestibility coefficient of the various fats was similar, although the rats fed the toxic oil did absorb less fat because of the lower intake. The nitrogen content of the periovarian adipose tissue was highest in the rats fed the toxic oil, and the adipose-tissue fatty acids most affected by this treatment were linoleic and linolenic acid. The delta-9 desaturase activity, measured in terms of the C16:1/C16:0 and C18:1/C18:0 ratios, was significantly less in the group fed the toxic oil, which suggests functional modifications of the adipocyte related to lipogenesis. 相似文献
90.
THYMUS SERPYLLOIDES ssp. GADORENSIS is endemic in the Betic region (Spain). Gas chromatography and GC/mass spectrometry studies of its essential oil showed its major components to be carvacrol and its biosynthetic precursors (gamma-terpinene and P-cymene). 相似文献