全文获取类型
收费全文 | 8460篇 |
免费 | 476篇 |
国内免费 | 112篇 |
专业分类
耳鼻咽喉 | 127篇 |
儿科学 | 151篇 |
妇产科学 | 81篇 |
基础医学 | 1408篇 |
口腔科学 | 141篇 |
临床医学 | 691篇 |
内科学 | 1777篇 |
皮肤病学 | 481篇 |
神经病学 | 626篇 |
特种医学 | 518篇 |
外科学 | 1026篇 |
综合类 | 19篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 311篇 |
眼科学 | 192篇 |
药学 | 834篇 |
中国医学 | 143篇 |
肿瘤学 | 520篇 |
出版年
2024年 | 7篇 |
2023年 | 74篇 |
2022年 | 242篇 |
2021年 | 340篇 |
2020年 | 179篇 |
2019年 | 231篇 |
2018年 | 283篇 |
2017年 | 232篇 |
2016年 | 322篇 |
2015年 | 400篇 |
2014年 | 511篇 |
2013年 | 483篇 |
2012年 | 786篇 |
2011年 | 773篇 |
2010年 | 403篇 |
2009年 | 370篇 |
2008年 | 499篇 |
2007年 | 428篇 |
2006年 | 345篇 |
2005年 | 380篇 |
2004年 | 266篇 |
2003年 | 224篇 |
2002年 | 225篇 |
2001年 | 175篇 |
2000年 | 184篇 |
1999年 | 130篇 |
1998年 | 48篇 |
1997年 | 27篇 |
1996年 | 35篇 |
1995年 | 15篇 |
1994年 | 32篇 |
1993年 | 16篇 |
1992年 | 41篇 |
1991年 | 44篇 |
1990年 | 37篇 |
1989年 | 49篇 |
1988年 | 28篇 |
1987年 | 30篇 |
1986年 | 25篇 |
1985年 | 22篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1981年 | 9篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1971年 | 4篇 |
1970年 | 4篇 |
1967年 | 4篇 |
排序方式: 共有9048条查询结果,搜索用时 15 毫秒
991.
ObjectivesThe purpose of this study is to compare the effectiveness of resistance and balance exercise in reducing the risk of falls for females 65-years-old or older.DesignThe study was a single blind, controlled trial, conducted over a period of 12-weeks with pre- and post-exercise assessment.Patients and methodsNinety-five participants were randomly assigned to one of three groups: resistance-training group, balance training group, control group. Resistance training group were trained to increase strength of upper, lower. Balance training group were trained to improve balance, coordination and proprioception. Outcome measurement consisted of balance ability, muscle strength, proprioception and fall efficacy.ResultsThe resistance and balance exercise group showed a statistically significant improvement in balance ability compared to the control group (P < 0.01). The resistance exercise group showed significant improvement in muscle strength compared to the balance exercise group (P < 0.01). The balance exercise group showed significant improvement in proprioception compared to the resistance exercise group (P < 0.01). Both resistance and balance exercise showed a significant improvement in fall efficacy than the control group (P < 0.01).ConclusionsWe conclude that the resistance and balance exercise have significant effects on balance ability and falls efficacy in older females. 相似文献
992.
Different expression patterns of nitric oxide synthase isozymes in various gynecological cancers 总被引:11,自引:0,他引:11
993.
Sang Jung Park Jin Dong Kim Yeon Seok Seo Beom Jin Park Min Ju Kim Soon Ho Um Chang Ha Kim Hyung Joon Yim Soon Koo Baik Jin Yong Jung Bora Keum Yoon Tae Jeen Hong Sik Lee Hoon Jai Chun Chang Duck Kim Ho Sang Ryu 《World journal of gastroenterology : WJG》2013,19(16):2543-2549
AIM: To evaluate the significance of computed tomography (CT) findings in relation to liver chemistry and the clinical course of acute hepatitis. METHODS: Four hundred and twelve patients with acute hepatitis who underwent enhanced CT scanning were enrolled retrospectively. Imaging findings were analyzed for the following variables: gallbladder wall thickness (GWT), arterial heterogeneity, periportal tracking, number and maximum size of lymph nodes, presence of ascites, and size of spleen. The serum levels of alanine aminotransferase, alkaline phosphatase, bilirubin, albumin, and prothrombin time were measured on the day of admission and CT scan, and laboratory data were evaluated every 2-4 d for all subjects during hospitalization. RESULTS: The mean age of patients was 34.4 years, and the most common cause of hepatitis was hepatitis A virus (77.4%). The mean GWT was 5.2 mm. The number of patients who had findings of arterial heterogeneity, periportal tracking, lymph node enlargement > 7 mm, and ascites was 294 (80.1%), 348 (84.7%), 346 (84.5%), and 56 (13.6%), respectively. On multivariate logistic regression, male gender [odds ratio (OR) = 2.569, 95%CI: 1.477-4.469, P = 0.001], toxic hepatitis (OR = 3.531, 95%CI: 1.444-8.635, P = 0.006), level of albumin (OR = 2.154, 95%CI: 1.279-3.629, P = 0.004), and GWT (OR = 1.061, 95%CI: 1.015-1.110, P = 0.009) were independent predictive factors for severe hepatitis. The level of bilirubin (OR = 1.628, 95%CI: 1.331-1.991, P < 0.001) and GWT (OR = 1.172, 95%CI: 1.024-1.342,P = 0.021) were independent factors for prolonged cholestasis in multivariate analysis. CONCLUSION: In patients with acute hepatitis, GWT on CT scan was an independent predictor of severe hepatitis and prolonged cholestasis. 相似文献
994.
Jeong Ill Suh Jeong Kyu Sakong Kwan Lee Yong Kook Lee Jeong Bae Park Dong Joon Kim Yeon Seok Seo 《World journal of gastroenterology : WJG》2013,19(47):9069-9076
AIM:To investigate anxiety and depression propensities in patients with toxic liver injury.METHODS:The subjects were divided into three groups:a healthy control group(Group 1,n=125),an acute non-toxic liver injury group(Group 2,n=124),and a group with acute toxic liver injury group caused by noncommercial herbal preparations(Group 3,n=126).These three groups were compared and evaluated through questionnaire surveys and using the Hospital Anxiety-Depression Scale(HADS),Beck Anxiety Inventory(BAI),Beck Depression Inventory(BDI),and the hypochondriasis scale.RESULTS:The HADS anxiety subscale was 4.9±2.7,5.0±3.0 and 5.6±3.4,in Groups 1,2,and 3,respectively.The HADS depression subscale in Group 3 showed the most significant score(5.2±3.2,6.4±3.4 and 7.2±3.4in Groups 1,2,and 3,respectively)(P<0.01 vs Group 1,P<0.05 vs Group 2).The BAI and BDI in Group 3showed the most significant score(7.0±6.3 and 6.9±6.9,9.5±8.6 and 8.8±7.3,10.7±7.2 and 11.6±8.5in Groups 1,2,and 3,respectively)(BAI:P<0.01 vs Group 1,P<0.05 vs Group 2)(BDI:P<0.01 vs Group1 and 2).Group 3 showed a significantly higher hypochondriasis score(8.2±6.0,11.6±7.5 and 13.1±6.5in Groups 1,2,and 3,respectively)(P<0.01 vs Group 1,P<0.05 vs Group 2).CONCLUSION:Psychological factors that present vulnerability to the temptation to use alternative medicines,such as herbs and plant preparations,are important for understanding toxic liver injury. 相似文献
995.
John P. Aris Ashley L. Alvers Roy A. Ferraiuolo Laura K. Fishwick Amanda Hanvivatpong Doreen Hu Christine Kirlew Michael T. Leonard Kyle J. Losin Michelle Marraffini Arnold Y. Seo Veronica Swanberg Jennifer L. Westcott Michael S. Wood Christiaan Leeuwenburgh William A. Dunn Jr. 《Experimental gerontology》2013
We have previously shown that autophagy is required for chronological longevity in the budding yeast Saccharomyces cerevisiae. Here we examine the requirements for autophagy during extension of chronological life span (CLS) by calorie restriction (CR). We find that autophagy is upregulated by two CR interventions that extend CLS: water wash CR and low glucose CR. Autophagy is required for full extension of CLS during water wash CR under all growth conditions tested. In contrast, autophagy was not uniformly required for full extension of CLS during low glucose CR, depending on the atg allele and strain genetic background. Leucine status influenced CLS during CR. Eliminating the leucine requirement in yeast strains or adding supplemental leucine to growth media extended CLS during CR. In addition, we observed that both water wash and low glucose CR promote mitochondrial respiration proficiency during aging of autophagy-deficient yeast. In general, the extension of CLS by water wash or low glucose CR was inversely related to respiration deficiency in autophagy-deficient cells. Also, autophagy is required for full extension of CLS under non-CR conditions in buffered media, suggesting that extension of CLS during CR is not solely due to reduced medium acidity. Thus, our findings show that autophagy is: (1) induced by CR, (2) required for full extension of CLS by CR in most cases (depending on atg allele, strain, and leucine availability) and, (3) promotes mitochondrial respiration proficiency during aging under CR conditions. 相似文献
996.
Ho Cheol Hong Ji-Sung Lee Hae Yoon Choi Sae Jeong Yang Hye Jin Yoo Ji A Seo Sin Gon Kim Nan Hee Kim Sei Hyun Baik Dong Seop Choi Kyung Mook Choi 《Metabolism: clinical and experimental》2013
Objective
Increased liver enzymes and decreased vitamin D levels are associated with insulin resistance and type 2 diabetes. We examined liver enzymes and vitamin D levels in metabolically healthy but obese (MHO) individuals and compared the values with those of other body size phenotypes in the Korean population.Materials/Methods
A total of 16,190 people over the age of 18 years were analyzed using data from the Fourth Korean National Health and Nutrition Examination Survey, which is a nationally representative survey. Body size phenotypes were classified into four groups by body mass index (BMI) and number of metabolic syndrome components.Results
The prevalence of MHO was 14.9% in the entire population and 47.7% in the obese population. In a correlation analysis adjusted for age, sex, and BMI, AST and ALT levels were positively correlated with insulin resistance and cardiometabolic risk factors of the metabolic syndrome, whereas vitamin D level was negatively correlated with these variables. MHO individuals had significantly lower concentrations of AST and ALT compared to metabolically abnormal obese (MAO) subjects, although vitamin D levels were not significantly different. Furthermore, a multiple logistic regression analysis revealed that MHO individuals had lower risk of liver enzyme abnormality compared to MAO after adjusting for potential confounding factors. However, the risk of vitamin D deficiency was not significantly different among groups with different body size phenotypes.Conclusions
Although both liver enzymes and vitamin D levels are related to insulin resistance and metabolic syndrome, only liver enzymes were independently associated with MHO phenotype. 相似文献997.
Ho Dong Kim Do Hyun Kim Hyeuk Park Woo Jong Kim Yong Soo Ahn Young Jik Lee Sun Mi Park Eun Seon Seo Chul Park Yang Ho Kim Hyung Rag Kim Young Eun Joo Young Do Jung 《Gut and liver》2013,7(1):30-34
Background/Aims
The objective of this study was to evaluate a monoclonal antibody-based test to detect Helicobacter pylori-specific antigen in gastric aspirates from humans.Methods
Sixty-one volunteers were enrolled in the study. All of the subjects underwent a 13C-urea breath test (UBT) before esophagogastroduodenoscopy. Gastric aspirates were analyzed for pH and ammonia and used for polymerase chain reaction (PCR), culture, and monoclonal antibody-based detection of H. pylori. Multiple biopsies of the gastric antrum and body were obtained for a rapid urease test (RUT) and histological evaluation.Results
Thirty-six subjects were H. pylori-positive and 25 were H. pylori-negative according to the UBT results. Compared with the H. pylori-negative subjects, H. pylori-positive subjects had a higher pH (4.77±1.77 vs 3.49±1.30, p<0.05) and ammonia level (1,130.9±767.4 vs 184.2±126.3, p<0.0001). The sensitivities and specificities of the PCR test, RUT, culture test, and monoclonal antibody-based test were 100% and 72%, 89% and 100%, 47% and 100%, and 78% and 100%, respectively.Conclusions
The monoclonal antibody-based test for diagnosing H. pylori infection in gastric aspirates has increased sensitivity compared with the culture test and specificity as high as that of the RUT. The test may be useful as an additive test for examining gastric aspirates. 相似文献998.
Nark-Soon Park Yoon Tae Jeen Hyuk Soon Choi Eun Sun Kim Young Jin Kim Bora Keum Yeon Seok Seo Hoon Jai Chun Hong Sik Lee Soon Ho Um Chang Duck Kim Ho Sang Ryu 《Gut and liver》2013,7(4):443-449
Background/Aims
Acute complicated diverticulitis can be subdivided into moderate diverticulitis and severe diverticulitis. Although there have been numerous studies on the risk factors for complicated diverticulitis, little research has focused on severe diverticulitis. This study was designed to identify the risk factors for severe diverticulitis in an acute diverticulitis attack using the modified Hinchey classification.Methods
Patients were included if they had any evidence of acute diverticulitis detected by computed tomography. The patients were subdivided into severe diverticulitis (Hinchey class ≥Ib; abscesses or peritonitis) and moderate diverticulitis (Hinchey class Ia; pericolic inflammation) groups.Results
Of the 128 patients, 25 exhibited severe diverticulitis, and 103 exhibited moderate diverticulitis. In a multivariate analysis, age >50 years (odds ratio [OR], 5.27; p=0.017), smoking (OR, 3.61; p=0.044), comorbidity (OR, 4.98; p=0.045), leukocytosis (OR, 7.70; p=0.003), recurrence (OR, 4.95; p=0.032), and left-sided diverticulitis (OR, 6.92; p=0.006) were significantly associated with severe diverticulitis.Conclusions
This study suggests that the risk factors for severe diverticulitis are age >50 years, smoking, comorbidity, leukocytosis, recurrent episodes, and left-sided diverticulitis. 相似文献999.