全文获取类型
收费全文 | 1230篇 |
免费 | 88篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 45篇 |
妇产科学 | 37篇 |
基础医学 | 154篇 |
口腔科学 | 30篇 |
临床医学 | 210篇 |
内科学 | 222篇 |
皮肤病学 | 5篇 |
神经病学 | 38篇 |
特种医学 | 193篇 |
外科学 | 105篇 |
综合类 | 35篇 |
一般理论 | 3篇 |
预防医学 | 114篇 |
眼科学 | 1篇 |
药学 | 92篇 |
肿瘤学 | 51篇 |
出版年
2023年 | 14篇 |
2022年 | 11篇 |
2021年 | 27篇 |
2020年 | 12篇 |
2019年 | 18篇 |
2018年 | 21篇 |
2017年 | 14篇 |
2016年 | 26篇 |
2015年 | 16篇 |
2014年 | 33篇 |
2013年 | 48篇 |
2012年 | 41篇 |
2011年 | 51篇 |
2010年 | 43篇 |
2009年 | 65篇 |
2008年 | 48篇 |
2007年 | 50篇 |
2006年 | 38篇 |
2005年 | 47篇 |
2004年 | 20篇 |
2003年 | 29篇 |
2002年 | 30篇 |
2001年 | 23篇 |
2000年 | 36篇 |
1999年 | 22篇 |
1998年 | 43篇 |
1997年 | 50篇 |
1996年 | 43篇 |
1995年 | 39篇 |
1994年 | 25篇 |
1993年 | 27篇 |
1992年 | 18篇 |
1991年 | 13篇 |
1990年 | 12篇 |
1989年 | 30篇 |
1988年 | 30篇 |
1987年 | 22篇 |
1986年 | 18篇 |
1985年 | 23篇 |
1984年 | 14篇 |
1983年 | 14篇 |
1982年 | 22篇 |
1981年 | 14篇 |
1980年 | 20篇 |
1978年 | 16篇 |
1977年 | 13篇 |
1976年 | 8篇 |
1974年 | 9篇 |
1972年 | 5篇 |
1914年 | 5篇 |
排序方式: 共有1340条查询结果,搜索用时 31 毫秒
1.
Erin C. Tully Jackson M. Gray Sherryl H. Goodman Stephen Nowicki Jr. 《Early child development and care》2016,186(12):1939-1951
Children who expect they can bring about good outcomes and avoid bad outcomes tend to experience more personal successes. Little is known about factors that contribute to these ‘control expectancies’. The purpose of the present study was to determine whether children's internal control expectancies occur in the context of parents’ internal control expectancies, low family strain, and high family cohesiveness and whether these factors are more strongly related to daughters’ than sons’ control expectancies. A community sample of 85 children aged 9–11 years and their parents (85 mothers; 63 fathers) completed rating scales. Fathers’ more internal control expectancies and mothers’ reports of fewer family strains were associated with daughters’ but not sons’ greater internal control expectancies, and greater family cohesiveness was related to both daughters’ and sons’ internal control orientations. These findings suggest that family factors may contribute to children's, particularly daughters’, development of internal control expectancies. 相似文献
2.
3.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
4.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence. 相似文献
5.
Huang Guo-Shu MD Chang Wei-Chou MD Lee Herng-Sheng MD † Taylor John A. M. DC DACBR ‡ Cheng Tiang-Yeu MD § Chen Cheng-Yu MD 《Dermatologic surgery》2005,31(6):717-719
BACKGROUND: Merkel cell carcinoma is a rare malignant neuroendocrine neoplasm characteristically arising from the dermis of sunlight-exposed skin. It rarely arises outside the skin. OBJECTIVE: We present a patient with primary Merkel cell carcinoma arising from subcutaneous fat, with no involvement of the overlying skin. We describe the clinical manifestations and magnetic resonance imaging (MRI) findings. METHODS: We report a 63-year-old woman with a primary lesion of Merkel cell carcinoma that arose from the subcutaneous fat layer of the left arm. The lesion presented as a subcutaneous nodule with intact overlying skin. MRI showed that the nodular lesion was located entirely in the subcutaneous fat layer, with no involvement of the dermis. Peritumoral infiltration around the lesion and enlarged lymph nodes deep to the lesion were noted. The patient received wide excision of the lesion with dissection of the regional lymph nodes and adjuvant radiotherapy and chemotherapy. RESULTS: Histopathologic examination confirmed the diagnosis of Merkel cell carcinoma with local lymphatic metastasis, and the lesion was completely located in the subcutaneous fat, with no involvement of the dermis. These findings were well correlated with MRI findings. CONCLUSION: Primary Merkel cell carcinoma may arise from the subcutaneous fat and present as an entirely subcutaneous lesion with intact skin. MRI is helpful to evaluate the local extension of the lesion and regional lymphatic metastasis. 相似文献
6.
表小檗碱对α受体的作用 总被引:2,自引:0,他引:2
表小檗碱(epiberberine,EB)是从湖北产黄连(Coptis chinensis Franch)中提取的一种生物碱,属苯喹嗪类原小檗碱,对其药理作用的研究资料甚少,未见其对α肾上腺素体作用的报道。资料表明,许多原小檗碱类化合物有α受体阻滞作用,为从该类化合物中选择 相似文献
7.
The purpose of this pilot study was to observe both relaxed and deep breathing patterns in a convenience sample to determine the incidence of normal versus faulty patterns of respiration. These observations were then combined with respondent answers to a survey on pain history to determine if there is any correlation between faulty breathing and musculo-skeletal pain patterns. If such a correlation can be made, then we propose that clinicians working with chronic pain patients may have improved outcomes if they address and correct faulty breathing patterns. Based on this study, it is suggested to include the evaluation and treatment of faulty respiration in the rehabilitation of chronic musculo-skeletal conditions, most notably cervical pain. 相似文献
8.
9.
Faced with scarce resources, the Visiting Nurse Association of Omaha (VNA), Bishop Clarkson College, Creighton University, and University of Nebraska Medical Center collaborated to maintain services. Baccalaureate students learned to deliver community health nursing while serving a population in need of these services, but not coverable by funding sources. The Student Learning Center established by the VNA enabled 254 students to provide 5,035 home visits to families without funding sources. 相似文献
10.
36例踝关节骨折合并下胫腓联合分离的治疗体会 总被引:1,自引:1,他引:0
0 引言 踝关节骨折是临床上较常见的关节内骨折,包含了腓骨骨折,内踝骨折,后踝骨折和下胫腓联合的损伤. 处理不当可导致踝穴的变形,下胫腓联合分离后期出现创伤性关节炎. 相似文献