全文获取类型
收费全文 | 67258篇 |
免费 | 5202篇 |
国内免费 | 2112篇 |
专业分类
耳鼻咽喉 | 726篇 |
儿科学 | 1466篇 |
妇产科学 | 632篇 |
基础医学 | 6417篇 |
口腔科学 | 3352篇 |
临床医学 | 6568篇 |
内科学 | 8987篇 |
皮肤病学 | 1219篇 |
神经病学 | 2222篇 |
特种医学 | 3751篇 |
外科学 | 13735篇 |
综合类 | 9755篇 |
现状与发展 | 10篇 |
一般理论 | 4篇 |
预防医学 | 6502篇 |
眼科学 | 959篇 |
药学 | 3863篇 |
37篇 | |
中国医学 | 2431篇 |
肿瘤学 | 1936篇 |
出版年
2024年 | 188篇 |
2023年 | 1043篇 |
2022年 | 2260篇 |
2021年 | 2627篇 |
2020年 | 2460篇 |
2019年 | 2019篇 |
2018年 | 2107篇 |
2017年 | 1905篇 |
2016年 | 2361篇 |
2015年 | 2313篇 |
2014年 | 4243篇 |
2013年 | 4441篇 |
2012年 | 3800篇 |
2011年 | 4218篇 |
2010年 | 3487篇 |
2009年 | 3572篇 |
2008年 | 3429篇 |
2007年 | 3453篇 |
2006年 | 3108篇 |
2005年 | 3009篇 |
2004年 | 2413篇 |
2003年 | 2095篇 |
2002年 | 1657篇 |
2001年 | 1552篇 |
2000年 | 1425篇 |
1999年 | 1109篇 |
1998年 | 982篇 |
1997年 | 881篇 |
1996年 | 667篇 |
1995年 | 729篇 |
1994年 | 625篇 |
1993年 | 477篇 |
1992年 | 466篇 |
1991年 | 411篇 |
1990年 | 340篇 |
1989年 | 317篇 |
1988年 | 312篇 |
1987年 | 274篇 |
1986年 | 260篇 |
1985年 | 228篇 |
1984年 | 183篇 |
1983年 | 98篇 |
1982年 | 149篇 |
1981年 | 114篇 |
1980年 | 110篇 |
1979年 | 133篇 |
1978年 | 98篇 |
1977年 | 95篇 |
1976年 | 71篇 |
1973年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
脐带夹对防止脐部感染和出血的临床与实验研究 总被引:2,自引:0,他引:2
目的应用国产脐带夹用于农村山区破伤风高发区,并经离体试验验证其可靠性。方法经湖南、江西、广西等省基层接生员临床应用、并与当地同期或前一年未用夹者进行对照;同时经离体脐带用脐带夹、气门芯或纱线结扎阻断血管后进行金黄色葡萄球菌和破伤风毒素通透试验以及测试承受气压程度试验。结果1年临床使用2296例中,无1例发生破伤风和败血症。可靠性试验结果证明,粗纱线结扎最差,气门芯虽优于前者,但不如脐带夹。结论该脐带夹由于夹持力持久有力,细菌、毒素难以通过、安全可靠,因此能降低新生儿“病从脐入”的发病率和死亡率,有利干优生优育的贯彻.这是一项花费少、收效大的简而易行的适宜技术,值得推广。 相似文献
83.
TheClinicalEfectsofAlantoinPowderforGargleonPeriodontalDiseasesandAphthousUlcerYuWeiyi(俞未一)SunWeibin(孙卫斌)DepartmentofStomatol... 相似文献
84.
本文总结了14例应用刮治和自体骨移植术治疗大型牙源性角化囊肿的方法,14例植骨均成活,4例术后囊肿复发,再次手术,指出:与骨断切除治疗大型角化囊肿的方法比较,此法最大的优点是有利于保持患者面容和咀嚼功能,并对大型角化囊肿的手术原则,自体骨移植问题及手术注意事项进行了讨论。 相似文献
85.
H. Kobayashi Y. Kotoura M. Hosono T. Tsuboyama C. Shigeno J. Konishi 《European radiology》1995,5(6):651-653
Melorheostosis is a benign sclerosing dysplasia with a very unusual and characteristic roentgenographic appearance. We reported a patient with melorheostosis in the left lower extremity followed up for 14 years. Although the extraosseous lesions only slightly enlarged, the bone scintigraphy showed the activity of the metabolism to be still high. 相似文献
86.
自1992年3月至1994年5月,对中原地区4个省20多个县(市)近200个单位33555名20~75岁的已婚妇女,进行妇科疾病发生情况与年龄、职业、文化、月经、孕产等五种因素关系的调查分析。在33555名妇女中,患病者22370人,总患病率为66.67%,查出妇科疾病42种,计76974例次。结果证明:以25~35岁年龄组发病率最高,其中以内生殖器炎症为主;职业以经商者发病率高,特别是性病患者高于其他职业者二倍以上;文化程度以小学、初中者发病率高,尤其宫颈炎更明显;月经情况:随着经前期紧张综合征的加重,更年期综合征发病率增高;孕产次数越多,患病率越高。本次调查未发现宫颈癌,进一步证明我国对妇女保健工作的关心和重视。 相似文献
87.
Paul A. Demers Thomas L. Vaughan Thomas D. Koepsell Joseph L. Lyon G. Marie Swanson Raymond S. Greenberg Noel S. Weiss 《American journal of industrial medicine》1993,23(4):629-639
Lifetime job histories from a population-based, case-control study were analyzed to investigate the relationship between multiple myeloma and employment in various occupations and industries. Interviews were obtained from 89% (692) of eligible incident cases and 83% (1683) of eligible controls. An elevated risk was observed among persons ever employed as painters [odds ratio (OR) + 2.1, 95% confidence interval (CI) + 1.2–3.6], particularly for those employed for 10 or more years (OR + 4.1, 95% CI + 1.8–10.4). A small excess risk was observed among agricultural workers employed for 10 or more years (OR + 1.3, 95% CI + 1.0–2.2), with a higher relative risk observed among farm laborers (OR + 1.8, 95% CI + 1.0–4.0). Among agricultural workers who reported having been highly exposed to pesticides, the OR was 5.2 (95% CI + 1.6–21.1). Some evidence, based on smaller numbers, was also found to support an association with firefighting and employment in the petroleum- and coal-products manufacturing industries. Little evidence was found to support the previously noted association with wood exposure, and no evidence for an association with employment in the rubber or petroleum refining industries was found. This study lends further support to previously reported associations between multiple myeloma and employment among painters and agricultural workers. © 1993 Wiley-Liss, Inc. 相似文献
88.
Per R. Flood Peter Fritz Schmidt Gro R. Wesenberg Hermod Gadeholt 《Archives of toxicology》1988,62(4):295-300
Two iliac crest needle biopsies were taken from a 43-year-old lead-poisoned woman during and after completion of a Ca-EDTA treatment. By atomic absorption spectroscopy the first and second biopsy were found to contain 56, respectively 41.6 g lead/g wet tissue. In both biopsies 36% of the lead was extractable in 0.1 N HCl. Electron microbeam X-ray analysis proved to have too low sensitivity for quantitation of the lead in these biopsies. Laser microbeam mass analysis (LAMMA), performed only on the second biopsy, revealed a high and fairly constant residual lead concentration in all bone marrow cell nuclei (approximately 55 g/g) and a low lead concentration in the cytoplasm of the same cells (4–12 (g/g). The extracellular bone matrix lead was greatly concentrated in the superficial 3–6 m osteoid zone of the bony trabeculae and totally absent from deeper parts of the mineralized matrix. The LAMMA results are in good agreement with those of subcellular fractionation experiments and atomic absorption spectroscopy, provided that the relative volume fraction of nucleus and cytoplasm is accounted for. The high residual osteoid lead after completed chelation therapy indicates that lead has a stronger affinity for the organic than the mineral components of bone matrix. 相似文献
89.
Daniel J. Wallace MD Associate Clinical Professor of Medicine 《Seminars in arthritis and rheumatism》1989,18(4):282-296
Atabrine has been available for nearly 60 years. It has a variety of actions and has been administered to millions of individuals. Its antirheumatic properties have been well documented but have not been exploited optimally for a variety of reasons. The drug is generally quite safe and could be used in low doses in lupus and rheumatoid arthritis patients as a steroid-sparing agent or synergistically with hydroxychloroquine. Its bothersome side effects should not deter the clinician from using it, because they are easy to deal with or prevent (Table 5). Future studies should attempt to better characterize the immunosuppressive actions of this powerful drug, particularly in the treatment of lupus erythematosus and rheumatoid arthritis. Studies of the role of combination or single-agent antimalarial therapy in combination with other "remittive" drugs could be of great potential benefit. 相似文献
90.
Autoimmune hepatitis type 1 and primary biliary cirrhosis have distinct bone marrow cytokine production 总被引:3,自引:0,他引:3
Zachou K Rigopoulou EI Tsikrikoni A Alexandrakis MG Passam F Kyriakou DS Stathakis NE Dalekos GN 《Journal of autoimmunity》2005,25(4):389-288
We have recently reported differences in the hematopoiesis between autoimmune hepatitis type 1 (AIH-1) and primary biliary cirrhosis (PBC). In view of the notion that cytokines are regulators of hematopoiesis, we investigated in our tertiary center the cytokine production in the bone marrow (BM) of the same consecutive cohort of patients (13 AIH-1, 13 PBC, 10 healthy and 7 patients with cirrhosis due to chronic hepatitis B). Interferon-gamma (IFN-gamma), interleukin-4 (IL-4), interleukin-10 (IL-10), tumor necrosis factor-alpha (TNF-alpha) and transforming growth factor-beta (TGF-beta) were determined in the supernatants of long-term BM cultures by ELISAs. IL-4, TNF-alpha and TGF-beta were found significantly increased in the BM of PBC patients compared to AIH-1 and both control groups. AIH-1 patients had significantly higher BM IL-10 compared to PBC patients and higher IL-10, IL-4 and TNF-alpha compared to controls. BM IFN-gamma was significantly higher in PBC and AIH-1 patients compared to controls. In AIH-1 patients, IL-10 was positively correlated with CD34+, CD34+/CD38- and CD34+/CD38+ cell proportions. In conclusion, the BM cytokine microenvironment of PBC and AIH-1 patients differs significantly compared to that of healthy individuals and cirrhotic patients of non-autoimmune etiology. Differences were also found between patients with PBC and AH-1. The implication of BM in the pathogenesis of autoimmune liver diseases is possible and needs further investigation. 相似文献