全文获取类型
收费全文 | 23107篇 |
免费 | 1724篇 |
国内免费 | 144篇 |
专业分类
耳鼻咽喉 | 199篇 |
儿科学 | 832篇 |
妇产科学 | 633篇 |
基础医学 | 3087篇 |
口腔科学 | 373篇 |
临床医学 | 2447篇 |
内科学 | 4764篇 |
皮肤病学 | 495篇 |
神经病学 | 2602篇 |
特种医学 | 494篇 |
外科学 | 2070篇 |
综合类 | 152篇 |
一般理论 | 37篇 |
预防医学 | 3036篇 |
眼科学 | 290篇 |
药学 | 1436篇 |
1篇 | |
中国医学 | 39篇 |
肿瘤学 | 1988篇 |
出版年
2024年 | 32篇 |
2023年 | 377篇 |
2022年 | 682篇 |
2021年 | 1198篇 |
2020年 | 752篇 |
2019年 | 990篇 |
2018年 | 1066篇 |
2017年 | 807篇 |
2016年 | 867篇 |
2015年 | 912篇 |
2014年 | 1187篇 |
2013年 | 1428篇 |
2012年 | 2100篇 |
2011年 | 2121篇 |
2010年 | 1095篇 |
2009年 | 923篇 |
2008年 | 1366篇 |
2007年 | 1290篇 |
2006年 | 1202篇 |
2005年 | 1040篇 |
2004年 | 887篇 |
2003年 | 750篇 |
2002年 | 650篇 |
2001年 | 101篇 |
2000年 | 77篇 |
1999年 | 84篇 |
1998年 | 104篇 |
1997年 | 93篇 |
1996年 | 70篇 |
1995年 | 75篇 |
1994年 | 49篇 |
1993年 | 55篇 |
1992年 | 45篇 |
1991年 | 41篇 |
1990年 | 32篇 |
1989年 | 28篇 |
1988年 | 41篇 |
1987年 | 31篇 |
1986年 | 30篇 |
1985年 | 20篇 |
1984年 | 36篇 |
1983年 | 18篇 |
1982年 | 27篇 |
1981年 | 32篇 |
1980年 | 22篇 |
1979年 | 12篇 |
1978年 | 13篇 |
1974年 | 15篇 |
1973年 | 13篇 |
1971年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
María Cabrerizo Gloria Trallero María José Pena Amaia Cilla Gregoria Megias Carmen Mu?oz-Almagro Eva Del Amo Diana Roda Ana Isabel Mensalvas Antonio Moreno-Docón Juan García-Costa Nuria Rabella Manuel Ome?aca María Pilar Romero Sara Sanbonmatsu-Gámez Mercedes Pérez-Ruiz María José Santos-Mu?oz Cristina Calvo And the study group of “Enterovirus parechovirus infections in children under ?years-old Spain” PI- 《European journal of pediatrics》2015,174(11):1511-1516
23.
Ragan McLeod Sunyoung Kim Sara Tomek Sara McDaniel 《Early child development and care》2019,189(8):1284-1291
Young children enter kindergarten with varying levels of readiness and abilities to learn. One factor that contributes to lower levels of school readiness is poverty. One timely, cost-effective, and feasible strategy to boost school readiness, regardless of exposure to high-quality preschool is to leverage the summer months prior to kindergarten entry and provide comprehensive, evidence-based programming immediately before the school year begins. The current study implemented a community-based summer programme targeted at improving school readiness for 25 four- and five-year-old children in a low-income community. Across the 9-week study, children participated in two types of early literacy activities and the Incredible Years social/emotional learning curriculum. Results indicate that participants demonstrated significant growth across three early literacy skills and were rated as overall stable regarding their behaviour across the summer. These results are discussed along with implications and future directions in this line of research. 相似文献
24.
25.
Marco Maruzzo Umberto Basso Eugenio Borsatti Laura Evangelista Filippo Alongi Orazio Caffo Francesca Maines Sara Galuppo Rocco De Vivo Fable Zustovich Dario Palleschi Andrea Zivi Teodoro Sava Mariella Sorarù Roberto Iacovelli Maurizio Nicodemo Susanne Baier Lucia Fratino Vittorina Zagonel 《Clinical genitourinary cancer》2019,17(1):e187-e194
Background
Radium 223 was introduced for metastatic castration-resistant prostate cancer based on the results of a randomized controlled trial showing risk reduction for death and skeletal events. Our aim was to evaluate the outcome of patients receiving radium 223 in a real-world setting.Patients and Methods
We conducted a multicenter retrospective analysis in the Triveneto region of Italy.Results
One hundred fifty-eight patients received radium 223 in our region. After a median follow-up of 9.5 months, 75 patients died. The median overall survival (OS) was 14.2 months, and the median progression-free survival (PFS) was 6.2 months. Seventy-one (45%) patients achieved progression as best response. Thirty-seven (23%) patients stopped the treatment early because of progression. Eastern Cooperative Oncology Group performance status was prognostic for OS (18.4 vs. 12.3 vs. 7.5 months; 0 vs. 1, P = .0062; 0 vs. 2, P = .0002), whereas previous prostatectomy or docetaxel exposure were not. A neutrophil to lymphocytes ratio ≥ 3 significantly impacted OS (18.1 vs. 9.7 months; P < .001) and slightly impacted PFS (6.6 vs. 5.6 months; P = .05). Patients with a baseline alkaline phosphatase (ALP) value ≥ 220 U/L had worse OS and PFS (24.1 vs. 10.5 months; 7.2 vs. 5.5 months; P < .001). Patients with changes in ALP value achieved better OS (P = .029) and PFS (P = .002). There was no difference according to the line of therapy (0 vs. ≥ 1; P = .490). The main grade 3/4 toxicities were anemia, asthenia, and thrombocytopenia.Conclusion
This large real-world report confirms comparable OS and PFS data when compared with the pivotal study, as well as the predictive role of ALP and neutrophil to lymphocytes ratio. The definition of the optimal position of radium 223 in the treatment of metastatic castration-resistant prostate cancer has still to be defined. 相似文献26.
Daniela Brizzolara Anna Chilosi Paola Cipriani Gloria Di Filippo Filippo Gasperini Sara Mazzotti Chiara Pecini Pierluigi Zoccolotti 《Cognitive and behavioral neurology》2006,19(3):141-149
OBJECTIVE: The study aims to verify whether phonologic and rapid automatized naming (RAN) deficits are present and associated in Italian dyslexic children and whether they differentially affect dyslexics with and without a history of previous language delay (LD). BACKGROUND: According to the phonologic core deficit hypothesis, dyslexia may stem from impairment of the representation and manipulation of phonemes and may be closely associated with oral language deficits. However, deficits in tasks not requiring fine-grained phonologic representations, such as RAN, have also been described in dyslexic children. METHODS: Thirty-seven children were selected on the basis of a reading deficit and were assigned to 2 groups according to whether or not they had a history of early LD as determined retrospectively by parental report. A battery of reading and writing, verbal working memory, metaphonologic, RAN, and visual search tests were administered. RESULTS: RAN deficits were shared by most dyslexics (with and without a history of LD), whereas phonologic deficits were mainly associated with a previous LD. This last condition did not result in a more profound impairment of reading and writing decoding skills. CONCLUSION: In a shallow orthography such as Italian, RAN, not phonologic deficits, may represent the main cognitive marker of developmental dyslexia. 相似文献
27.
28.
29.
30.
The efficiency of a new prothrombin-based activated protein C (APC) resistance test to detect factor V Leiden (FVL) was clinically evaluated in 150 Italian patients with deep venous thrombosis. Patient samples are diluted in factor-V-deficient plasma, an APC-containing reagent, and specific factor V activator; after incubation, clotting is initiated by addition of activated-factor-FV-dependent prothrombin activator. Two prothrombin time determinations were performed under identical assay conditions except that no APC was added to one. A ratio over 4.2 for normal individuals and under 2.0 for FVL patients is expected: between 1.3 and 1.9 for FVL heterozygotes, and between 1.0 and 1.1 for FVL homozygotes. Using a predefined cut-off ratio of 2.0, a specificity and a sensitivity of 1.00 for detection of FVL mutation were found. With a cut-off ratio of 1.1, a specificity of 0.98 and a sensitivity of 1.00 were found for discrimination between FVL heterozygous (n = 60) and homozygous (n = 6). No interferences by heparins, oral contraceptives, oral anticoagulant therapy, protein C, protein S, D-dimer, homocysteine, MTHFR mutations and antiphospholipid autoantibodies were detected. In our experience, this new prothrombin time-based APC resistance assay provides improved discrimination between normal individuals and FVL carriers compared with the classical methods. Moreover, this new assay allows good discrimination between homozygous and heterozygous FVL carriers. In the authors' experience this prothrombin time-based method was not influenced by many factors compared with the classical activated partial thromboplastin time-based method. 相似文献