全文获取类型
收费全文 | 2537篇 |
免费 | 139篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 22篇 |
儿科学 | 58篇 |
妇产科学 | 37篇 |
基础医学 | 318篇 |
口腔科学 | 68篇 |
临床医学 | 195篇 |
内科学 | 610篇 |
皮肤病学 | 80篇 |
神经病学 | 260篇 |
特种医学 | 108篇 |
外科学 | 213篇 |
综合类 | 12篇 |
预防医学 | 123篇 |
眼科学 | 100篇 |
药学 | 247篇 |
中国医学 | 34篇 |
肿瘤学 | 206篇 |
出版年
2023年 | 20篇 |
2022年 | 34篇 |
2021年 | 57篇 |
2020年 | 49篇 |
2019年 | 37篇 |
2018年 | 53篇 |
2017年 | 48篇 |
2016年 | 57篇 |
2015年 | 55篇 |
2014年 | 87篇 |
2013年 | 99篇 |
2012年 | 170篇 |
2011年 | 205篇 |
2010年 | 106篇 |
2009年 | 94篇 |
2008年 | 185篇 |
2007年 | 217篇 |
2006年 | 181篇 |
2005年 | 185篇 |
2004年 | 175篇 |
2003年 | 156篇 |
2002年 | 143篇 |
2001年 | 21篇 |
2000年 | 10篇 |
1999年 | 22篇 |
1998年 | 35篇 |
1997年 | 27篇 |
1996年 | 17篇 |
1995年 | 18篇 |
1994年 | 10篇 |
1993年 | 22篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 13篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1985年 | 5篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1974年 | 4篇 |
1973年 | 2篇 |
1969年 | 2篇 |
排序方式: 共有2691条查询结果,搜索用时 31 毫秒
71.
Miyuki Ushio Maki Kanaoka Yumiko Kinoshita Satoko Maeno Kimie Fujita 《Topics in stroke rehabilitation》2013,20(8):591-598
Background: Physical activity (PA) is beneficial for stroke prevention; in particular, moderate-to-vigorous physical activity (MVPA). However, few studies have investigated its relationship with recurrent ischemic stroke (RIS).Objectives: To clarify the relationship between MVPA and RIS and the burden of risk factors after a first-ever ischemic stroke.Methods: A total of 45 outpatients (mean age 67.1 ± 10.2 years) who had previously experienced a transient ischemic attack or a minor non-cardioembolic ischemic stroke at a single hospital in Japan (mean 6.4 ± 4.2 years previously), were enrolled between March and June 2016. All patients wore an accelerometer around their hips for 10 days, and their percentage body fat (%BF) and visceral fat level (VFL) were measured by bioelectrical impedance. Retrospective information about the history of RIS and risk factors (blood pressure, lipoprotein cholesterol and estimated glomerular filtration rate) were extracted from the clinical records. Binary logistic regression models were used to estimate the relevance of the RIS history to MVPA and potential risk factors such as sociodemographic and clinical variables (obesity, smoking and hypertension).Results: RIS occurred in 9 patients; they had significantly higher VFL (p = 0.007) and %BF (p = 0.007) values and lower MVPA (p = 0.011) values than patients without recurrence. A multivariate analysis of these factors indicated that age, VFL and MVPA were signi?cant independent predictors of RIS.Conclusions: Patients with a history of mild ischemic stroke had low MVPA and high VFL values, which together may be a risk factor for RIS. 相似文献
72.
Ryosuke Kita Mika Seto Hiromasa Takahashi Yumiko Sakamoto Toshihiro Kikuta 《Oral Science International》2013,10(1):40-43
Wiskott–Aldrich syndrome (WAS) is a condition with variable expression, which causes persistent thrombocytopenia and, in its complete form, also causes small platelets and humoral immunodeficiency. A 14-year-old boy, diagnosed with WAS but never treated, presented with symptoms of heart and renal failure. His right buccal region was swollen and his right first molar showed a cyst-like image on dental X-ray films. The boy's symptoms were attributed to an infected cyst, greatly aggravated by WAS-related immunodeficiency. The boy was sedated and the affected tooth and cyst were enucleated. Invasive treatment was safely achieved by paying close attention to whole-body management. 相似文献
73.
Tatsuhiko Kuroda Shiro Tanaka Mitsuru Saito Yumiko Shiraki Masataka Shiraki 《Calcified tissue international》2013,93(3):269-275
The aim of this cross-sectional cohort study was to clarify risk factors for severe vertebral fractures in postmenopausal Japanese women. Subjects were ambulatory volunteers age over 50 years who were recruited from a population of outpatients at a primary care institute. At registration, age, body mass index (BMI), bone mineral density (BMD), and present illness were investigated. Biochemical parameters including urinary levels of type I collagen cross-linked N-telopeptides (NTXs), and pentosidine and plasma levels of homocysteine were measured. Values were compared with different fracture grades (grade 0–3). A total of 1,475 postmenopausal women (66.6 ± 9.0 years) were included in the present study. Distributions of vertebral fracture grades were grade 1, 137 cases (9.3 %); grade 2, 124 cases (8.4 %); and grade 3, 162 cases (11.0 %). Age, BMI, BMD, NTX, pentosidine, and homocysteine were significantly associated with vertebral fracture in unadjusted analysis. In addition, a higher prevalence of hypertension was observed in patients with severe fracture. When comparing vertebral fracture grade 0 versus grade 2–3 by multiple regression analysis, pentosidine and homocysteine levels were a significant risk for moderate/severe vertebral fracture (odds ratio [OR] = 1.17, 95 % confidence interval [CI] 1.00–1.38, p = 0.049; OR = 1.22, 95 % CI 1.03–1.46, p = 0.013). Homocysteine levels were also a significant risk when comparing vertebral fracture grade 0 versus grade 3 (OR = 1.27, 95 % CI 1.04–1.58, p = 0.021). Plasma level of homocysteine was an independent risk for severe vertebral fractures. 相似文献
74.
75.
76.
77.
Tsukasa Saida Yumiko Oishi Tanaka Koji Matsumoto Toyomi Satoh Hiroyuki Yoshikawa Manabu Minami 《Japanese journal of radiology》2016,34(2):117-124
Ovarian cancer is the seventh most common cancer diagnosis among women worldwide. The International Federation of Gynecology and Obstetrics recently significantly revised staging criteria for cancer of the ovary. The latest revision was based on the concept that high-grade serous tubal intraepithelial carcinoma (STIC) may be the origin of some high-grade serous carcinomas of the ovary and peritoneum. Therefore, staging criteria for the ovary, fallopian tube, and peritoneum have been unified. Understanding this background and other important revised points are essential for radiologists concerned with imaging diagnosis in gynecologic oncology. Through this review, we introduce the STIC theory and show examples of diseases in accordance with the new staging criteria based on magnetic resonance imaging (MRI) and computed tomography (CT) results. 相似文献
78.
Associations of radiographic degeneration and pain with daily cumulative hip loading in patients with secondary hip osteoarthritis
下载免费PDF全文
![点击此处可从《Journal of orthopaedic research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hiroshige Tateuchi Yumiko Koyama Rui Tsukagoshi Haruhiko Akiyama Koji Goto Kazutaka So Yutaka Kuroda Noriaki Ichihashi 《Journal of orthopaedic research》2016,34(11):1977-1983
79.
80.
The quasimonoclonal (QM) mouse provides a model to analyze B cell selection because major B cell antigen receptors (BCR) are composed of the knockin V(H)DJ(H) 17.2.25 (V(H)T) encoded H chain and the lambda1 or lambda2 L chain, thereby being specific for (4-hydoxy-3-nitrophenyl)acetyl (NP). We have reported that during a T-dependent antibody (Ab) response for a low-affinity NP analog p-nitrophenylacetyl (pNP), although V(H)T/lambda1 and V(H)T/lambda2 IgM were equally produced, V(H)T/lambda2 IgG almost exclusively underwent affinity maturation toward pNP. The initial affinity of V(H)T/lambda2 B cells for pNP was approximately 50-100-fold higher than that of V(H)T/lambda1 B cells, suggesting a role of BCR affinity in recruiting B cells to affinity maturation processes. Here, we investigated whether the intensity of BCR signals could contribute to the selection of V(H)T/lambda2 B cells for affinity maturation. V(H)T/lambda2 B cells were more responsive to pNP than V(H)T/lambda1 B cells in vitro. When CFSE-labeled QM B cells were transferred into the wild type mice where T cells had been primed with chicken gamma-globulin (CGG), QM B cells challenged by pNP-conjugated CGG could be observed to get activated and migrate to GCs in the early phase of the T-dependent response to pNP-CGG. Adoptive transfer of sorted populations revealed that the V(H)T/lambda2 B cell population was more potent in migration into GCs than the V(H)T/lambda1 counterpart. Thus, it is suggested that the higher BCR affinity of V(H)T/lambda2 B cells may be an initial cue for their recruitment to GCs during a T-dependent Ab response. 相似文献