全文获取类型
收费全文 | 37061篇 |
免费 | 4431篇 |
国内免费 | 699篇 |
专业分类
耳鼻咽喉 | 272篇 |
儿科学 | 997篇 |
妇产科学 | 407篇 |
基础医学 | 2650篇 |
口腔科学 | 840篇 |
临床医学 | 6955篇 |
内科学 | 4648篇 |
皮肤病学 | 261篇 |
神经病学 | 6825篇 |
特种医学 | 726篇 |
外科学 | 2991篇 |
综合类 | 3019篇 |
一般理论 | 6篇 |
预防医学 | 6180篇 |
眼科学 | 171篇 |
药学 | 3202篇 |
71篇 | |
中国医学 | 801篇 |
肿瘤学 | 1169篇 |
出版年
2024年 | 52篇 |
2023年 | 994篇 |
2022年 | 1189篇 |
2021年 | 2192篇 |
2020年 | 2205篇 |
2019年 | 2318篇 |
2018年 | 2130篇 |
2017年 | 2095篇 |
2016年 | 1970篇 |
2015年 | 1687篇 |
2014年 | 2847篇 |
2013年 | 3762篇 |
2012年 | 2062篇 |
2011年 | 2130篇 |
2010年 | 1628篇 |
2009年 | 1579篇 |
2008年 | 1595篇 |
2007年 | 1490篇 |
2006年 | 1250篇 |
2005年 | 1076篇 |
2004年 | 863篇 |
2003年 | 786篇 |
2002年 | 630篇 |
2001年 | 558篇 |
2000年 | 443篇 |
1999年 | 353篇 |
1998年 | 319篇 |
1997年 | 289篇 |
1996年 | 236篇 |
1995年 | 206篇 |
1994年 | 211篇 |
1993年 | 155篇 |
1992年 | 151篇 |
1991年 | 120篇 |
1990年 | 94篇 |
1989年 | 84篇 |
1988年 | 60篇 |
1987年 | 76篇 |
1986年 | 60篇 |
1985年 | 54篇 |
1984年 | 45篇 |
1983年 | 25篇 |
1982年 | 30篇 |
1981年 | 20篇 |
1980年 | 20篇 |
1979年 | 17篇 |
1978年 | 10篇 |
1976年 | 3篇 |
1975年 | 9篇 |
1974年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 944 毫秒
1.
2.
ObjectivesTo confirm what impairments are present in runners with Achilles tendinopathy (AT) and explore the variance of AT severity in an adequately powered study.DesignCase-control study.SettingTwo private physiotherapy clinics in Australia and Spain.ParticipantsForty-four recreational male runners with AT and 44 healthy controls matched by age, height, and weight.Main outcome measuresDemographics, activity (IPAQ-SF), pain and function (VISA-A), pain during hopping (Hop pain VAS), hopping duration, psychological factors (TSK-11, PASS20), and physical tests regarding lower-limb maximal strength and endurance.ResultsBody mass index (BMI), activity, VISA-A, pain, and duration of hopping, TSK-11, PASS20, standing heel raise to failure, seated heel raise and leg extension 6RM, hip extension and abduction isometric torque were significantly different between groups (P < 0.05) with varied effect sizes (V = 0.22, d range = 0.05–4.18). 46% of AT severity variance was explained by higher BMI (β = −0.41; p = 0.001), weaker leg curl 6RM (β = 0.32; p = 0.009), and higher pain during hopping (β = −0.43; p = 0.001).ConclusionRunners with AT had lower activity levels, lower soleus strength, and were less tall. BMI, pain during hopping, and leg curl strength explained condition severity. This information, identified with clinically applicable tools, may guide clinical assessment, and inform intervention development. 相似文献
3.
4.
5.
6.
Rebecca Martin 《Early child development and care》2019,189(4):683-696
The current study explored the influence of three methods of parental emotion discourse (structured story-telling, reminiscing, and picture book) and their relation to preschoolers’ emotion understanding. Thirty-seven families participated in the study. Analyses showed that the structured story-telling method produced more emotion words, was high in unique emotion words, and was high for both emotion labelling and explanations. All three methods showed some potential to predict preschooler’s emotion understanding. Structured story-telling was best at predicting role-taking, while reminiscing and the picture book both were better at predicting situation knowledge. Additional studies are needed to further explore the influence of different methods of assessing emotion discourse to enhance validity and reliability of research in this field. 相似文献
7.
Arvid Nikolai Kildahl Sissel Berge Helverschou Trine Lise Bakken Hanne Weie Oddli 《Journal of mental health research in intellectual disabilities》2020,13(3):201-230
ABSTRACT
Introduction
Individuals with autism spectrum disorder (ASD) and intellectual disability (ID) seem to be at increased risk for post-traumatic stress disorder (PTSD), but knowledge is sparse regarding its identification in this population. Previous research indicates that certain symptoms of PTSD may be more easily recognized, and that identifying reexperiencing and avoidance is particularly challenging. 相似文献8.
Amy L. Judd Kathryn L. Beck Christopher McKinlay Ashleigh Jackson Cathryn A. Conlon 《Maternal & child nutrition》2020,16(1)
Dietary assessment in infants is challenging but necessary to understand the relationship between nutrition and growth and development. Currently no simple, validated methods exist to assess nutrient intake in New Zealand (NZ) infants. Therefore, this study aimed to assess the relative validity and reproducibility of a Complementary Food Frequency Questionnaire (CFFQ) to determine nutrient intakes of NZ infants. Ninety‐five parent–infant pairs (infant age 10 ± 1 months) completed the CFFQ twice (CFFQ‐1 and CFFQ‐2), 4 weeks apart (to assess reproducibility). A 4‐day weighed food record (4dWFR) was collected between CFFQ administrations (to assess validity). Validity and reproducibility were assessed for intakes of energy and 18 nutrients using Bland–Altman analysis, Pearson's correlation coefficients, cross‐classification, and weighted Kappa (κ). The CFFQ showed acceptable validity: Nutrients from the CFFQ were comparable with the 4dWFR (bias, 9–28%), correlation between methods ranged from r = .18 (saturated fat) to r = .81 (iron; mean r = .52), 54% (mean) of participants were correctly classified (range 39% to 67%), and 7.1% (mean) misclassified into opposite tertiles (range 2.1% to 14.7%). There was acceptable agreement between the CFFQ and 4dWFR (κ = 0.20–0.60). The CFFQ showed good reproducibility: Correlations ranged from r = .34 (folate) to r = .80 (zinc); for 16 nutrients, >50% of participants were correctly classified, and for all nutrients, <10% of participants were grossly misclassified. All nutrients showed acceptable to good agreement (κ > 0.20). The CFFQ has acceptable relative validity and good reproducibility for assessing nutrient intake in NZ infants aged 9–12 months, making it a useful tool for use in future research. 相似文献
9.
����ǿ�������Σ����������������� ٻ 《中国实用口腔科杂志》2015,8(5):297-301
??Objective To observe the effects of lithium chloride pretreatment on cognitive ability of aged rats after oral and maxillofacial surgery. Methods A total of 48 aged male SD rats??18 ~ 20 months old??weight 550 ~ 700 g?? were bought from the Experimental Animal Center of China Medical University . These rats were randomly divided into three groups??including the normal control group??group C??n=16????surgery and anesthesia group??group O??n=16????and lithium chloride preconditioning group??group L??n=16??.Rats in each group were randomly divided into two parts??one part was given Morris water maze test three days after the surgery and its characteristics of behavior tested. Another part was decapitated 24 h after the surgery and extracted and the hippocampus brain separated at the same time. Test expression content of IL-1β GSK-3β p-GSK-3β??ser9??in the hippocampus by Elisa and Western blotting detection method respectively. Results Morris water maze test showed that??the first day after surgery??latencies of group L and O were significantly longer than group C??compared with group C in swimming distance?? latency and swim distances of group L were shorter than group O. With the comparison of multiple analysis of variance??differences were statistically significant??P??0.05??. Groups L and O in the second day were slightly shortened compared to the first day??on the third day after surgery it has also improved over the second day. Space exploration experiments in rats showed that??the dwell time of group C was significantly longer in the platform quadrant and the frequency of crossing the platform also increased compared with groups L and O. In addition??group L and group O were higher in IL-β levels than group C??the difference being statistically significant by analysis of variance??P??0.05????but group L was significantly lower compared with group O??the difference being statistically significant??P??0.05??. The content of GSK-3β of three groups were of no significant difference??P > 0.05????but p-GSK-3β??ser9??content was significantly lower in group L and O than in group C. The content of GSK-3β of group L was higher than in group O??the difference being statistically significant??P??0.05??. Conclusion Pretreatment with lithium chloride in postoperative aged rats can inhibit the expression of inflammatory cytokines and increase GSK-3β phosphorylation in the hippocampus cells??so p-GSK-3β??ser9??upregulates and inhibites the apoptosis of brain cells??thereby improved cognitive abilities after the cavity and maxillofacial surgery. 相似文献
10.
Robert C. Lynall J. Troy Blackburn Kevin M. Guskiewicz Stephen W. Marshall Prudence Plummer Jason P. Mihalik 《Journal of Science and Medicine in Sport》2019,22(5):503-508