首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   31898篇
  免费   2678篇
  国内免费   1342篇
耳鼻咽喉   390篇
儿科学   584篇
妇产科学   570篇
基础医学   3894篇
口腔科学   543篇
临床医学   3383篇
内科学   5323篇
皮肤病学   741篇
神经病学   2126篇
特种医学   1036篇
外国民族医学   13篇
外科学   4083篇
综合类   4036篇
现状与发展   4篇
一般理论   19篇
预防医学   1909篇
眼科学   1148篇
药学   2562篇
  19篇
中国医学   1086篇
肿瘤学   2449篇
  2024年   61篇
  2023年   433篇
  2022年   934篇
  2021年   1389篇
  2020年   1029篇
  2019年   970篇
  2018年   1085篇
  2017年   954篇
  2016年   956篇
  2015年   1244篇
  2014年   1548篇
  2013年   1487篇
  2012年   2298篇
  2011年   2342篇
  2010年   1336篇
  2009年   1122篇
  2008年   1656篇
  2007年   1678篇
  2006年   1647篇
  2005年   1651篇
  2004年   1203篇
  2003年   1029篇
  2002年   917篇
  2001年   779篇
  2000年   793篇
  1999年   768篇
  1998年   430篇
  1997年   361篇
  1996年   273篇
  1995年   290篇
  1994年   232篇
  1993年   168篇
  1992年   303篇
  1991年   287篇
  1990年   276篇
  1989年   251篇
  1988年   217篇
  1987年   203篇
  1986年   197篇
  1985年   150篇
  1984年   106篇
  1983年   71篇
  1982年   49篇
  1981年   53篇
  1979年   73篇
  1978年   51篇
  1977年   52篇
  1974年   65篇
  1973年   60篇
  1972年   63篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
ObjectiveTo assess the feasibility of enrollment and collecting patient-reported outcome (PRO) data as part of routine clinical urologic care for bladder and prostate cancer patients and examine overall patterns and racial variations in PRO use and symptom reports over time.Subjects/Patients and MethodsWe recruited 76 patients (n = 29 Black and n = 47 White) with prostate or bladder cancer at a single, comprehensive cancer center. The majority of prostate cancer patients had intermediate risk (57%) disease and underwent either radiation or prostatectomy. Over half (58%) of bladder cancer patients had muscle invasive disease and underwent cystectomy.Patients were asked to complete PRO symptom surveys using their preferred mode [web- or phone-based interactive voice response (IVR)]. Symptom summary reports were shared with providers during visits. Surveys were completed at 3 time points and assessed urinary, sexual, gastrointestinal, anxiety/depression, and sleep symptoms. Feasibility of enrollment and survey completion were calculated, and linear mixed effects models estimated differences in outcomes by race and time.ResultsSixty three percent of study participants completed all PRO measures at all 3 time points. Black patients were more likely to select IVR as their survey mode (40% vs. 13%, P < 0.05), and less likely to complete all surveys (55% vs. 74%, P = 0.13). Patients using IVR were also less likely to complete all surveys (41% vs. 69%, P = 0.046).ConclusionsReported preferences for survey mode and completion rates differ by race, which may influence survey completion rates and highlight potential obstacles for equitable implementation of PROs into clinical care.  相似文献   
102.
ObjectiveFinancial toxicity (FT) has been defined as the patient-level impact of the costs of cancer care. Our objective was to better characterize FT among bladder cancer patients as well as oncologic, demographic and insurance characteristics related to FT.MethodsWe conducted a cross-sectional survey of the Bladder Cancer Advocacy Network Patient Survey Network using the validated COST (COmprehensive Score for financial Toxicity) questionnaire. Our primary outcome was relative degree of FT, with lower COST scores corresponding to worse FT. Wilcoxon rank sum tests and multiple regression were used to evaluate differences in demographic, diagnostic and treatment characteristics as they related to degree of FT.ResultsAmong 226 patients, median age was 68 years with 64% male, 83% married, and 49% with Medicare with supplemental insurance. Respondents reported an average of 65 months since diagnosis, with 62% reporting noninvasive disease. Mean COST was 28.4 (range 0–44). On multivariable analysis, patients who were younger, with a household annual income less than $50,000, not retired, or with insurance that was neither Medicare nor employer paid were significantly more likely to have worse FT. A majority of respondents (63.5%) agreed or strongly agreed that they would be interested in discussing cost in the context of their treatment preferences, independent of COST score (P = 0.24).ConclusionsA national cross-sectional survey demonstrated high prevalence of FT which was worse among younger patients with lower incomes, not retired, and without employer-paid or Medicare insurance. Most patients preferred to discuss treatment costs with their bladder cancer provider.  相似文献   
103.
IntroductionPatients with renal cell carcinoma (RCC) with level 3 or 4 caval thrombus have a poor prognosis, with reported five-year survival rates of 30–40%. The aim of this study was to assess the perioperative morbidity and long-term oncological outcomes for radical nephrectomy with resection of vena cava thrombus using a combined surgical approach, including extracorporeal circulation and deep hypothermic circulatory arrest.MethodsA retrospective review was performed of the institutional case log to identify all radical nephrectomies with caval thrombus performed from January 2006 to May 2020.ResultsTwenty-five patients were identified with level 2 thrombus in one (4%), level 3 thrombus in eight (32%), and level 4 in 16 (64%). The median followup was 20.6 months (range 0.2–133.3). The median age at surgery was 68.4 years (range 44.2–85.5). Twenty-one (84%) patients were symptomatic at presentation. Six (24%) patients had distant metastases at diagnosis. The median circulatory arrest time was 15 minutes (range 6–35). The 30-day grade ≥3 complication rate was 8%. The 30-day mortality rate was 8%. The one-year, two-year, three-year, and five-year recurrence-free survival (RFS) rates were 53%, 18%, 10%, and 10%, respectively. The median time to systemic treatment was 7.7 months (range 1.2–25.7). The one-year, two-year, three-year, and five-year overall survival (OS) rates were 70%, 43%, 36%, and 31%, respectively.ConclusionsRadical nephrectomy with resection of vena cava thrombus using extracorporeal circulation and deep hypothermic circulatory arrest is associated with some morbidity and mortality but remains a safe and effective strategy for advanced RCC patients who would otherwise be managed palliatively.  相似文献   
104.
Quality of Life Research - The psychometric properties of the Perth A-loneness Scale (PALs) have been extensively validated using classical test theory, but to date no studies have applied a Rasch...  相似文献   
105.
Yu  Hongjuan  Zeng  Xueyun  Sui  Mingjie  Liu  Rui  Tan  Rachel Lee-Yin  Yang  Jinjin  Huang  Weidong  Luo  Nan 《Quality of life research》2021,30(3):855-866
Quality of Life Research - This study aimed to compare the measurement properties of EQ-5D-3L(3L) and EQ-5D-5L(5L) in patients with acute myeloid leukemia (AML) in China. We consecutively recruited...  相似文献   
106.
107.
何凤田  谭骏 《免疫学杂志》1994,10(4):235-239
为了寻找和研究新的人类基因cDNA,本实验以T7DNA聚合酶对一DXFD52相关人肝细胞cDNA(DE)进行了分段部分测定,并将所测各部分序列分别在EMBL(欧洲分子生物学库)中进行核酸同源性检索,结果在库中没有找到任何具有同源性的人类基因或DNA片段。因此,我们初步认为DE为一新的人类基因cDNA片段。同时为初步探讨DE的功能,我们还成功地将DE构建于反转录病毒载体PLXSN上。  相似文献   
108.
Until recently, the technological evolution of information systems (IS) within the health care field has been relatively slow and sporadic in comparison to IS development in other industries. With the growing proliferation of powerful computers and personal workstations among health professionals, the advancement of IS technologies in the health care field has great potential. Hence, there is increasing pressure to integrate IS curricula into graduate level health administration education. This article combines earlier IS curricula from both the management and health care perspectives into an integrated framework for the development of a graduate education program in health information systems (HIS). The framework divides the HIS field into three modules: (1) HIS technologies and applications; (2) HIS theories and methodologies; and (3) HIS administration and impacts. This framework is also applied to the structuring of a master's level course for training generalists in HIS with a strong emphasis on the planning and management of hospital information systems.  相似文献   
109.
乳腺癌组织中—p—MAPK活化对c—fos和c—jun的激活作用   总被引:2,自引:0,他引:2  
OBJECTIVE: This paper was to investigate the relationship between expression of p-MAPK and oncogenesis of breast cancer. METHODS: Immunohistochemical technique was used to detect the expression of p-MAPK and c-fos and c-jun proteins in 68 cases of breast cancers, 42 cases of pericarcinomatous tissues and 7 cases of normal breast tissues. RESULTS: Positive stainings of p-MAPK, c-fos, and c-jun were localized in cancer cell nuclei. The positive rates of p-MAPK, c-fos, and c-jun were 86.8% (59/68), 82.4% (56/68), and 77.9% (53/68), respectively, which were much higher than that in pericarcinomatous tissues (P < 0.01). Of some cases, p-MAPK positive staining was also found in the nuclei of the fibroblastic and angioendothelial cells of cancer stroma. CONCLUSION: Activated or overexpressive MAPK activates the immediately-early oncogenes(c-fos, c-jun), which might play an important role in carcinogenesis of breast cancer and be an early event of oncogenesis of breast cancer.  相似文献   
110.
用RT-PCR技术从人胎盘组织内成功地扩增全长肝细胞生长因子(HGF)cDNA基因(2 184bp),并将其克隆至pGEM-T载体,经限制性核酸内切酶NdeⅠ,BglⅡ,HindⅢ,BamHⅠ和XhoⅠ的酶谱分析和DNA测序分析证实。再将其亚克隆至逆病毒载体pLNL-XHC,可进一步用于基因表达和基因治疗的研究。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号