全文获取类型
收费全文 | 6463篇 |
免费 | 452篇 |
国内免费 | 77篇 |
专业分类
耳鼻咽喉 | 106篇 |
儿科学 | 190篇 |
妇产科学 | 91篇 |
基础医学 | 843篇 |
口腔科学 | 279篇 |
临床医学 | 516篇 |
内科学 | 1453篇 |
皮肤病学 | 216篇 |
神经病学 | 346篇 |
特种医学 | 415篇 |
外科学 | 934篇 |
综合类 | 39篇 |
预防医学 | 356篇 |
眼科学 | 159篇 |
药学 | 413篇 |
中国医学 | 64篇 |
肿瘤学 | 572篇 |
出版年
2024年 | 6篇 |
2023年 | 49篇 |
2022年 | 101篇 |
2021年 | 270篇 |
2020年 | 158篇 |
2019年 | 194篇 |
2018年 | 235篇 |
2017年 | 201篇 |
2016年 | 280篇 |
2015年 | 324篇 |
2014年 | 350篇 |
2013年 | 381篇 |
2012年 | 574篇 |
2011年 | 516篇 |
2010年 | 331篇 |
2009年 | 214篇 |
2008年 | 373篇 |
2007年 | 350篇 |
2006年 | 320篇 |
2005年 | 315篇 |
2004年 | 276篇 |
2003年 | 222篇 |
2002年 | 188篇 |
2001年 | 115篇 |
2000年 | 110篇 |
1999年 | 96篇 |
1998年 | 38篇 |
1997年 | 31篇 |
1996年 | 29篇 |
1995年 | 17篇 |
1994年 | 24篇 |
1993年 | 20篇 |
1992年 | 26篇 |
1991年 | 42篇 |
1990年 | 20篇 |
1989年 | 31篇 |
1988年 | 23篇 |
1987年 | 18篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 15篇 |
1974年 | 5篇 |
1973年 | 5篇 |
1970年 | 4篇 |
1966年 | 7篇 |
排序方式: 共有6992条查询结果,搜索用时 15 毫秒
11.
Namita Wagle Nha Nam Do Jack Yu James L. Borke 《American journal of orthodontics and dentofacial orthopedics》2005,127(6):655-661
BACKGROUND: The periodontal ligament (PDL) is a soft tissue interposed between the tooth and the alveolar bone. It is responsible for transmission of forces in vivo; this promotes bone remodeling. The purpose our study was to use fractal analysis to quantify the complex morphology of the PDL-bone interface. METHODS: We used Scion Image (Scion Corp, Frederick, Md) and Benoit fractal analysis (Tru Soft International, St. Petersburg, Fla) programs to calculate the fractal dimension of the PDL-bone interface in rats via the box-counting method. Rats in the experimental groups received an initial force of 0.1N or 0.5N with customized springs for 6 hours. RESULTS: Our studies showed an increase in normal fractal dimension at the root apices of the rats' maxillary molars. We also found evidence that the fractal dimension varies along the entire root length from the apex to the cementoenamel junction. CONCLUSIONS: Mechanical loading might lead to an increase in fractal dimension at the PDL-bone interface apart from mechanisms of bone cell directed remodeling. These changes in fractal dimension are proportional to loading and could provide a new parameter for force determination in orthodontic tooth movement. 相似文献
12.
Hyo-Chang Kim Seok-Gu Kang Pil-Woo Huh Do Sung Yoo Kyoung Suok Cho Dal Soo Kim 《Journal of clinical neuroscience》2007,14(11):1135-1139
Pituitary abscess is a rare and potentially lethal condition. Pituitary abscess in a pregnant woman has not been previously described. A 38-year-old pregnant woman (34 weeks gestation) with a pituitary mass complained of a progressive headache and sudden visual impairment. She was afebrile and had no inflammatory symptoms on admission. On MRI, the preoperative diagnosis was pituitary adenoma with sphenoid sinusitis. She underwent an uncomplicated transsphenoidal procedure for removal of the pituitary mass. The next day, labor commenced and a healthy preterm baby was delivered. Pathologic examination of the intrasellar mass showed polymorphonuclear cells, debris and no tumor cells. The sellar contents were cultured and Streptococcus viridans was grown. To our knowledge this is the first case of pituitary abscess reported during pregnancy. Although the patient was pregnant, the transsphenoidal approach was safe for the mother and the fetus. Surgical drainage and antibiotic therapy are required for the definitive treatment of this condition. 相似文献
13.
14.
15.
16.
Murat Bozkurt Mahmut Uğurlu Metin Doğan Nihat Tosun 《Knee surgery, sports traumatology, arthroscopy》2007,15(6):753-755
A case of synovial chondromatosis of the proximal tibiofibular joint in addition to lateral and medial tibiofemoral spaces
and patellofemoral joint has been presented. 相似文献
17.
18.
Jan Paul Ouwens Wim van der Bij Thomas W van der Mark Albert Geertsma Do A Piers Wim J de Boer Gerard H Ko?ter 《The Journal of heart and lung transplantation》2004,23(1):115-121
BACKGROUND: A decrease in forced expiratory volume in 1 second (FEV(1)) as a diagnostic criterion for bronchiolitis obliterans syndrome (BOS) after single lung transplantation may be influenced significantly by the presence of the native lung. To quantify and to discriminate between the relative contribution of graft and native lung to the FEV(1), we retrospectively investigated the diagnostic value of combined FEV(1) measurements and ventilation scintigraphy in pulmonary dysfunction after single lung transplantation in 11 recipients with pulmonary vascular disease, 3 with obstructive lung disease, and 3 with restrictive lung disease. METHODS: We assessed function of the native lung and the graft, and subsequently calculated an adjusted grading of BOS by correcting routine FEV(1) measurements using linear interpolation of bi-annual lung ventilation scans. RESULTS: The contribution of the native lung to the total FEV(1) was slight (median, 9%) in recipients with obstructive disease compared with recipients with vascular (38%) or restrictive lung diseases (27%). Adjusted BOS grading was not useful in patients with obstructive disease. In the other patient groups, the onset of adjusted BOS Grade 1 and standard BOS Grade 1 was at a median of 220 days (range, 127-1146 days) and 836 days (184-3065 days), respectively. CONCLUSION: Ventilation scintigraphy is a useful adjunct in the (early) diagnosis of BOS in recipients of single lung transplants who have vascular and restrictive lung diseases. 相似文献
19.
Z. Bircan M. Soran I. Yildirim M. Doĝan A. Şahin A. Bilici M. Danaci 《International urology and nephrology》1997,29(3):357-361
Radius, ulna, short bones (RUS), carpal (CARP) bone age (BA), tibial corticodiaphyseal (C/D) ratio and trabecular aspect were
assessed in 19 children with steroid dependent nephrotic syndrome and 15 age matched healthy children. Both RUS and CARP BA
were significantly lower than in the controls. Trabecular aspect and tibial C/D ratio did not show any statistical significance.
There was a positive correlation between HSDS and RUS BA delay (r=−0.476, p<0.05); CARP BA delay and RUS BA delay (r=0.563,
p<0.01) and RUS BA and CARP BA (r=0.891, p<0.001). In conclusion, RUS and CARP BA are both retarded and positively correlated
in steroid dependent nephrotic children. 相似文献
20.
Ahmet Terzioglu Ferruh Bingul Do?an Tuncali Firdevs Sahin Gürcan Aslan 《Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi》2004,38(5):317-319
We describe a woman with osseous destruction and rupture of the extensor tendon as a result of sarcoidosis in the left third finger with no evidence of systemic involvement. The tendon was repaired and she was successfully treated with prednisone. 相似文献