全文获取类型
收费全文 | 108994篇 |
免费 | 11865篇 |
国内免费 | 4879篇 |
专业分类
耳鼻咽喉 | 1110篇 |
儿科学 | 2252篇 |
妇产科学 | 1449篇 |
基础医学 | 7803篇 |
口腔科学 | 2131篇 |
临床医学 | 14779篇 |
内科学 | 12912篇 |
皮肤病学 | 1506篇 |
神经病学 | 4546篇 |
特种医学 | 4217篇 |
外科学 | 10069篇 |
综合类 | 21758篇 |
现状与发展 | 13篇 |
一般理论 | 50篇 |
预防医学 | 14470篇 |
眼科学 | 1320篇 |
药学 | 10540篇 |
120篇 | |
中国医学 | 8458篇 |
肿瘤学 | 6235篇 |
出版年
2024年 | 512篇 |
2023年 | 1682篇 |
2022年 | 3149篇 |
2021年 | 4354篇 |
2020年 | 3776篇 |
2019年 | 2537篇 |
2018年 | 3086篇 |
2017年 | 3450篇 |
2016年 | 2917篇 |
2015年 | 4596篇 |
2014年 | 5730篇 |
2013年 | 7492篇 |
2012年 | 9550篇 |
2011年 | 9842篇 |
2010年 | 8402篇 |
2009年 | 7559篇 |
2008年 | 7871篇 |
2007年 | 7616篇 |
2006年 | 6713篇 |
2005年 | 5548篇 |
2004年 | 4140篇 |
2003年 | 3424篇 |
2002年 | 2850篇 |
2001年 | 1952篇 |
2000年 | 1323篇 |
1999年 | 754篇 |
1998年 | 581篇 |
1997年 | 569篇 |
1996年 | 537篇 |
1995年 | 407篇 |
1994年 | 321篇 |
1993年 | 317篇 |
1992年 | 215篇 |
1991年 | 183篇 |
1990年 | 168篇 |
1989年 | 180篇 |
1988年 | 162篇 |
1987年 | 143篇 |
1986年 | 143篇 |
1985年 | 130篇 |
1984年 | 106篇 |
1983年 | 102篇 |
1982年 | 81篇 |
1981年 | 84篇 |
1980年 | 56篇 |
1979年 | 37篇 |
1978年 | 36篇 |
1977年 | 47篇 |
1976年 | 40篇 |
1971年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
第三脑室脑膜瘤(九例报告及文献回顾) 总被引:1,自引:0,他引:1
目的探讨第三脑室脑膜瘤的组织发生学、临床特点和外科治疗。方法报道9例经影像学、手术和病理学证实的第三脑室脑膜瘤,并回顾相关文献。结果第三脑室前部脑膜瘤5例,第三脑室后部脑膜瘤4例,平均发病年龄25.6岁,无明显性别差异;最常见的症状是梗阻性脑积水,缺乏硬脑膜附着为其影像学特征。肿瘤全切除6例。结论第三脑室脑膜瘤是一种罕见的脑室内脑膜瘤,起源于中间帆脉络组织或脉络丛,经半球间裂-胼胝体-穹隆间入路是合理的手术路径选择。 相似文献
82.
Diabetic neuropathic foot ulcers and amputation 总被引:2,自引:0,他引:2
David J. Margolis MD PhD ; Lynne Allen-Taylor PhD ; Ole Hoffstad MA ; Jesse A. Berlin ScD 《Wound repair and regeneration》2005,13(3):230-236
A neuropathic foot ulcer is a severe complication of diabetes that can result in a more severe complication, a lower extremity amputation. We conducted a cohort study of 24,616 individuals with a diabetic neuropathic foot ulcer treated within a multicenter wound care network. A total of 1653 (6.7%) individuals had an amputation and 46.3% of these amputations were of a toe or ray (minor amputation). In the more than 10-year follow-up period that we studied, the percentage of those who had an amputation varied between 5.6% and 8.4%. Of those who had an amputation, the percentage that had a minor amputation increased over time from 4.0% in the earliest years to more than 60% in the later years of observation. The single most important determinant of amputation was the observation of fascia, tendon, and bone at the initial assessment. In conclusion, about 7% of those with a diabetic neuropathic foot ulcer will have an amputation and in the past 10 years there has been a remarkable increase in the number of minor as compared to major amputations. 相似文献
83.
液基薄层细胞制片技术与宫颈细胞学诊断 总被引:21,自引:2,他引:19
通过对宫颈细胞学诊断的历史回顾,介绍了液基薄层细胞制片技术在国内外开展的情况及其利弊,提出我国医疗单位引进时应注意的问题,对Bethesda系统给予评价和介绍,强调我国细胞诊断学专业应规范诊断标准、加强专业人员培养、建立质量控制体系及整合资源。 相似文献
84.
针对现阶段专科层次临床护理课程教学存在的问题,主要从把好教师关、备课关、课堂教学关和临床见习关4个方面进行质量控制,以增强教师教学责任感,激发学生学习兴趣,促进教学质量的提高。 相似文献
85.
BACKGROUND: The reconstruction of small defects of the alar groove can be a unique challenge owing to the importance of maintaining its concave structure. OBJECTIVE: To present a report of a patient with a small alar groove defect that was repaired using a combination of partial primary closure and second-intention healing. METHODS: A 73-year-old female was referred for the treatment of a basal cell carcinoma of the right nasal ala and underwent Mohs micrographic surgery with clearance of the lesion. The final defect, less than 1 cm, extended to the subcutaneous fat. Two absorbable subcutaneous sutures were placed in the defect, and the wound was then allowed to heal by second intention. RESULTS. This closure yielded a good cosmetic result, with preservation of the alar groove. CONCLUSION: A combination of primary closure and second-intention healing is a time-efficient, low-risk option for nonperforating, small alar groove defects. 相似文献
86.
C端序列的删除对非出血重组蛇毒纤溶酶的影响 总被引:1,自引:1,他引:0
[目的]研究C端序列对非出血重组纤溶酶(rFⅡ)特异性、活性和热敏感性的影响.[方法]通过SOEing PCR方法构建删除C端序列的突变体,突变体和rFⅡ分别在P.pastoris中诱导表达.表达和纯化的蛋白用SDS-PAGE和Westeren blot进行鉴定.之后分析其生化特性.[结果]rFⅡ及突变体通过SDS-PAGE和Westeren blot得到证实.生化分析揭示:①突变体对显色底物N-(p-Tosyl)-Gly-Pro-Lys-pNA的催化效率(Kcat/Km)是rFⅡ的1.9倍;②突变体和rFⅡ对氧化的胰岛素B链拥有共同的优先裂解位点,可是在随后的裂解中开始展现差异;③突变体显示了更高的纤(原)活性;④热处理表明突变体相较r FⅡ对温度的增加更敏感;⑤通过圆二色谱测量,突变体的螺旋比例有所增加.[结论]删除的序列参与rFⅡ的特异性、活性和热敏感性,该序列可作为下一步优化的候选序列. 相似文献
87.
Intervention studies aimed at promoting increased physical activity have been trialled in many different settings including primary care, worksites and the community. Churches are also potential settings for physical activity promotion. However, little is known about the effectiveness of this setting for promoting physical activity, particularly in Australia. The purpose of this study was to evaluate the effectiveness of a mind, body and spiritually based health promotion program in increasing physical activity and promoting mental and spiritual health. Nineteen women completed the 8-week intervention, and 30 women in a non-health related 8-week program at the same church comprised a comparison group. Pre- and post-program surveys assessed outcome measures. Between-group differences over time were examined using one-way MANOVA's. Physical activity was higher in the intervention group than the comparison group. In contrast to the comparison group, both mental health (depression symptoms) and spiritual health improved significantly more among intervention participants. The data highlight the potential for a church-based setting and holistic approach to health promotion as a successful means of increasing physical activity and promoting mental and spiritual health among Australian women. 相似文献
89.
Jessica Swoboda DDS H. Asuman Kiyak MA PhD Rigmor E. Persson DDS MSD G. Rutger Persson DDS PhD David K. Yamaguchi PhD Michael I. MacEntee LDS FRCD© PhD Christopher C.L. Wyatt BSc DMD MSc 《Special care in dentistry》2006,26(4):137-144
There is limited information regarding oral health status and other predictors of oral health‐related quality of life. An association between oral health status and perceived oral health‐related quality of life (OHQOL) might help clinicians motivate patients to prevent oral diseases and improve the outcome of some dental public health programs. This study evaluated the relationship between older persons' OHQOL and their functional dentition, caries, periodontal status, chronic diseases, and some demographic characteristics. A group of 733 low‐income elders (mean age 72.7 ISD=4.71, 55.6% women, 55.1% members of ethnic minority groups in the U.S. and Canada) enrolled in the TEETH clinical trial were interviewed and examined as part of their fifth annual visit for the trial. OHQOL was measured by the Geriatric Oral Health Assessment Index (GOHAI); oral health and occlusal status by clinical exams and the Eichner Index; and demographics via interviews. Elders who completed the four‐year assessment had an average of 21.5 teeth (SD=6.9). with 8.5 occluding pairs (SD=4.6), and 32% with occlusal contacts in all four occluding zones. Stepwise multiple regressions were conducted to predict total GOHAI and its subscores (Physical, Social, and Worry). Functional dentition was a less significant predictor than ethnicity and being foreign‐bom. These variables, together with gender, years since immigrating, number of carious roots, and periodontal status, could predict 32% of the variance in total GOHAI, 24% in Physical, 27% in Social, and 21 % in the Worry subscales. These findings suggest that functional dentition and caries influence older adults' OHQOL, but that ethnicity and immigrant status play a larger role. 相似文献
90.
Endla K. Anday Michelle E. Cohen Howard S. Hoffman 《Developmental medicine and child neurology》1991,33(2):130-137
This study compared the results of reflex modification (RM)--an objective technique for assessing brainstem sensorineural processing--with those of auditory brainstem response (ABR) for a group of high-risk infants at comparable postconceptional ages. For the RM procedure, an eyeblink-eliciting tap to the glabella was presented either alone or accompanied by a brief 90dB SPL tone. 37 high-risk infants were tested with both RM and ABR at a mean postconceptional age of 37.3 weeks. Seven had an increased brainstem conduction time ('failed ABR') and eight did not exhibit significant reflex augmentation ('failed RM'), seven of whom also failed the ABR. These data provide evidence that sensory stimuli which affect the neural mechanisms responsible for the organization of the startle response and auditory processing share essential neural components. 相似文献