全文获取类型
收费全文 | 953771篇 |
免费 | 68976篇 |
国内免费 | 6920篇 |
专业分类
耳鼻咽喉 | 13090篇 |
儿科学 | 29258篇 |
妇产科学 | 26745篇 |
基础医学 | 132363篇 |
口腔科学 | 25704篇 |
临床医学 | 82160篇 |
内科学 | 190014篇 |
皮肤病学 | 19498篇 |
神经病学 | 74198篇 |
特种医学 | 38838篇 |
外国民族医学 | 370篇 |
外科学 | 148043篇 |
综合类 | 29879篇 |
一般理论 | 248篇 |
预防医学 | 68190篇 |
眼科学 | 21868篇 |
药学 | 70158篇 |
38篇 | |
中国医学 | 5057篇 |
肿瘤学 | 53948篇 |
出版年
2021年 | 7856篇 |
2019年 | 8412篇 |
2018年 | 11043篇 |
2017年 | 9100篇 |
2016年 | 9280篇 |
2015年 | 11552篇 |
2014年 | 15971篇 |
2013年 | 22236篇 |
2012年 | 30383篇 |
2011年 | 32480篇 |
2010年 | 20030篇 |
2009年 | 18322篇 |
2008年 | 29323篇 |
2007年 | 31052篇 |
2006年 | 31151篇 |
2005年 | 30821篇 |
2004年 | 28425篇 |
2003年 | 27477篇 |
2002年 | 26699篇 |
2001年 | 42620篇 |
2000年 | 43939篇 |
1999年 | 37572篇 |
1998年 | 10385篇 |
1997年 | 9455篇 |
1996年 | 9158篇 |
1995年 | 9090篇 |
1994年 | 8708篇 |
1993年 | 7932篇 |
1992年 | 28611篇 |
1991年 | 27379篇 |
1990年 | 26730篇 |
1989年 | 25633篇 |
1988年 | 23754篇 |
1987年 | 23357篇 |
1986年 | 22386篇 |
1985年 | 21241篇 |
1984年 | 15831篇 |
1983年 | 13494篇 |
1982年 | 8083篇 |
1979年 | 14589篇 |
1978年 | 10182篇 |
1977年 | 8603篇 |
1976年 | 8122篇 |
1975年 | 8939篇 |
1974年 | 10677篇 |
1973年 | 10173篇 |
1972年 | 9658篇 |
1971年 | 8909篇 |
1970年 | 8572篇 |
1969年 | 8014篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Kari Hemminki Kristina Sundquist Jan Sundquist Asta Försti Vaclav Liska Akseli Hemminki Xinjun Li 《International journal of cancer. Journal international du cancer》2023,152(6):1107-1114
Many environmental risk factors for hepatobiliary cancers are known but whether they are associated with specific cancer types is unclear. We present here a novel approach of assessing standardized incidence ratios (SIRs) of previously diagnosed comorbidities for hepatocellular carcinoma (HCC), gallbladder cancer (GBC), cholangiocarcinoma (CCA) and ampullary cancer. The 13 comorbidities included alcohol and nonalcohol related liver disease, chronic obstructive pulmonary disease, gallstone disease, viral and other kinds of hepatitis, infection of bile ducts, hepatic and other autoimmune diseases, obesity and diabetes. Patients were identified from the Swedish Inpatient Register from 1987 to 2018, and their cancers were followed from 1997 onwards. SIRs for HCC were 80 to 100 in men and women diagnosed with hepatitis C virus and they were also >10 in patients diagnosed with hepatitis B virus, other kind of hepatitis, hepatic autoimmune disease and nonalcohol related liver disease. Many of these risks, as well as alcohol related liver disease, were either specific to HCC or were shared with intrahepatic CCA. For GBC, CCA and ampullary cancer infection of bile ducts was the main risk factor. Gallstone disease, nonhepatic autoimmune diseases and diabetes were associated with all hepatobiliary cancers. The limitations of the study include inability to cover some rare risk factors and limited follow-up time. Many of the considered comorbidities are characterized by chronic inflammation and/or overt immune disturbance in autoimmune diseases. The results suggest that local chronic inflammation and a related immune disturbance is the carcinogenic trigger for all these cancers. 相似文献
2.
3.
S. M. White C. L. Shelton A. W. Gelb C. Lawson F. McGain J. Muret J. D. Sherman representing the World Federation of Societies of Anaesthesiologists Global Working Group on Environmental Sustainability in Anaesthesia 《Anaesthesia》2022,77(2):201-212
The Earth’s mean surface temperature is already approximately 1.1°C higher than pre-industrial levels. Exceeding a mean 1.5°C rise by 2050 will make global adaptation to the consequences of climate change less possible. To protect public health, anaesthesia providers need to reduce the contribution their practice makes to global warming. We convened a Working Group of 45 anaesthesia providers with a recognised interest in sustainability, and used a three-stage modified Delphi consensus process to agree on principles of environmentally sustainable anaesthesia that are achievable worldwide. The Working Group agreed on the following three important underlying statements: patient safety should not be compromised by sustainable anaesthetic practices; high-, middle- and low-income countries should support each other appropriately in delivering sustainable healthcare (including anaesthesia); and healthcare systems should be mandated to reduce their contribution to global warming. We set out seven fundamental principles to guide anaesthesia providers in the move to environmentally sustainable practice, including: choice of medications and equipment; minimising waste and overuse of resources; and addressing environmental sustainability in anaesthetists’ education, research, quality improvement and local healthcare leadership activities. These changes are achievable with minimal material resource and financial investment, and should undergo re-evaluation and updates as better evidence is published. This paper discusses each principle individually, and directs readers towards further important references. 相似文献
4.
Kinase alterations are increasingly recognised as oncogenic drivers in mesenchymal tumours. Infantile fibrosarcoma and the related renal tumour, congenital mesoblastic nephroma, were among the first solid tumours shown to harbour recurrent tyrosine kinase fusions, with the canonical ETV6::NTRK3 fusion identified more than 20 years ago. Although targeted testing has long been used in diagnosis, the advent of more robust sequencing techniques has driven the discovery of kinase alterations in an array of mesenchymal tumours. As our ability to identify these genetic alterations has improved, as has our recognition and understanding of the tumours that harbour these alterations. Specifically, this study will focus upon mesenchymal tumours harbouring NTRK or other kinase alterations, including tumours with an infantile fibrosarcoma-like appearance, spindle cell tumours resembling lipofibromatosis or peripheral nerve sheath tumours and those occurring in adults with a fibrosarcoma-like appearance. As publications describing the histology of these tumours increase so, too, do the variety kinase alterations reported, now including NTRK1/2/3, RET, MET, RAF1, BRAF, ALK, EGFR and ABL1 fusions or alterations. To date, these tumours appear locally aggressive and rarely metastatic, without a clear link between traditional features used in histological grading (e.g. mitotic activity, necrosis) and outcome. However, most of these tumours are amenable to new targeted therapies, making their recognition of both diagnostic and therapeutic import. The goal of this study is to review the clinicopathological features of tumours with NTRK and other tyrosine kinase alterations, discuss the most common differential diagnoses and provide recommendations for molecular confirmation with associated treatment implications. 相似文献
5.
慢性疼痛是一种复杂的身心疾病,包括躯体痛觉异常、认知障碍、负性情绪等多个方面的改变,同时伴随着神经系统的功能以及结构的改变。本文将对慢性疼痛与下行疼痛调节通路、疼痛情感-认知调控网络以及中脑边缘奖赏网络的相关性,以及针刺镇痛的中枢机制相关研究文献进行综述,旨在探讨下行疼痛调节通路、疼痛情感-认知调控网络以及中脑边缘奖赏网络在慢痛发生机制中的作用,为临床治疗慢性疼痛类疾病提供更优势的治疗方案。 相似文献
6.
目的 围绕足三里穴(ST36)进行文献可视化分析,探索近20年来有关足三里穴的研究进程、热点以及未来发展趋势。方法 以中国知网(CNKI)为数据来源,利用citespace软件对检索出的2000年1月至2021年11月收录的基础研究和临床研究文献分别进行可视化分析,绘制关键词、作者、机构相关图谱。结果 基础研究纳入1030篇文献,得到9个关键词聚类,电针中心度最高(0.53),发文量最多的作者是胡森(22篇),发文量最大的机构是北京中医药大学针灸推拿学院(23篇)。临床研究纳入2067篇文献,得到9个关键词聚类,穴位注射和针刺中心度最高(0.27),发文量最多的作者是张波(7篇),发文量最大的机构是浙江中医药大学附属第一医院(8篇)。结论 足三里穴在基础和临床的研究重点、热点和趋势不一致。并且在基础研究和临床研究之间,针刺镇痛、电针疗法、胃肠功能这三个内容是同步的,而关于代谢组学、穴位注射、温针灸和揿针的内容则是脱节的。 相似文献
7.
Moskaleva P. V. Shnayder N. A. Dmitrenko D. V. Shilkina O. S. Neznanov N. G. Nasyrova R. F. 《Neuroscience and behavioral physiology》2022,52(3):462-469
Neuroscience and Behavioral Physiology - The question of the involvement of impairments to the metabolism of melatonin and its precursors (tryptophan and serotonin) in the development of... 相似文献
8.
9.
10.
Ghemame M. Cathelineau C. Carsin-Nicol B. Eliat P.-A. Saint-Jalmes H. Ferré J.-C. Mouriaux F. 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(1):311-318
Graefe's Archive for Clinical and Experimental Ophthalmology - Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to... 相似文献