全文获取类型
收费全文 | 1567篇 |
免费 | 199篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 54篇 |
妇产科学 | 45篇 |
基础医学 | 141篇 |
口腔科学 | 10篇 |
临床医学 | 208篇 |
内科学 | 397篇 |
皮肤病学 | 57篇 |
神经病学 | 136篇 |
特种医学 | 82篇 |
外国民族医学 | 3篇 |
外科学 | 289篇 |
综合类 | 50篇 |
现状与发展 | 20篇 |
预防医学 | 113篇 |
眼科学 | 29篇 |
药学 | 68篇 |
中国医学 | 2篇 |
肿瘤学 | 71篇 |
出版年
2023年 | 43篇 |
2022年 | 7篇 |
2021年 | 23篇 |
2020年 | 24篇 |
2019年 | 16篇 |
2018年 | 61篇 |
2017年 | 59篇 |
2016年 | 41篇 |
2015年 | 60篇 |
2014年 | 65篇 |
2013年 | 76篇 |
2012年 | 62篇 |
2011年 | 93篇 |
2010年 | 65篇 |
2009年 | 88篇 |
2008年 | 88篇 |
2007年 | 58篇 |
2006年 | 49篇 |
2005年 | 41篇 |
2004年 | 38篇 |
2003年 | 33篇 |
2002年 | 31篇 |
2001年 | 34篇 |
2000年 | 32篇 |
1999年 | 39篇 |
1998年 | 36篇 |
1997年 | 39篇 |
1996年 | 48篇 |
1995年 | 34篇 |
1994年 | 20篇 |
1993年 | 24篇 |
1992年 | 14篇 |
1991年 | 20篇 |
1990年 | 25篇 |
1989年 | 20篇 |
1988年 | 24篇 |
1987年 | 22篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 11篇 |
1983年 | 10篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 12篇 |
1979年 | 10篇 |
1978年 | 14篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1975年 | 8篇 |
1971年 | 13篇 |
排序方式: 共有1791条查询结果,搜索用时 15 毫秒
51.
Anita Annaházi Richárd Róka András Rosztóczy Tibor Wittmann 《World journal of gastroenterology : WJG》2014,20(20):6031-6043
Irritable bowel syndrome (IBS) is a long-lasting, relapsing disorder characterized by abdominal pain/discomfort and altered bowel habits. Intestinal motility impairment and visceral hypersensitivity are the key factors among its multifactorial pathogenesis, both of which require effective treatment. Voltage-gated calcium channels mediate smooth muscle contraction and endocrine secretion and play important roles in neuronal transmission. Antispasmodics are a group of drugs that have been used in the treatment of IBS for decades. Alverine citrate, a spasmolytic, decreases the sensitivity of smooth muscle contractile proteins to calcium, and it is a selective 5-HT1A receptor antagonist. Alverine, in combination with simethicone, has been demonstrated to effectively reduce abdominal pain and discomfort in a large placebo-controlled trial. Mebeverine is a musculotropic agent that potently blocks intestinal peristalsis. Non-placebo-controlled trials have shown positive effects of mebeverine in IBS regarding symptom control; nevertheless, in recent placebo-controlled studies, mebeverine did not exhibit superiority over placebo. Otilonium bromide is poorly absorbed from the GI tract, where it acts locally as an L-type calcium channel blocker, an antimuscarinic and a tachykinin NK2 receptor antagonist. Otilonium has effectively reduced pain and improved defecation alterations in placebo-controlled trials in IBS patients. Pinaverium bromide is also an L-type calcium channel blocker that acts locally in the GI tract. Pinaverium improves motility disorders and consequently reduces stool problems in IBS patients. Phloroglucinol and trimethylphloroglucinol are non-specific antispasmodics that reduced pain in IBS patients in a placebo-controlled trial. Antispasmodics have excellent safety profiles. T-type calcium channel blockers can abolish visceral hypersensitivity in animal models, which makes them potential candidates for the development of novel therapeutic agents in the treatment of IBS. 相似文献
52.
53.
Wittmann T Stockbrugger R Herszényi L Jonkers D Molnár B Saurin JC Regula J Malesci A Laghi L Pintér T Teleky B Dítě P Tulassay Z 《Digestive diseases (Basel, Switzerland)》2012,30(3):320-322
Colorectal cancer (CRC) is the second most common newly diagnosed cancer and the second most common cause of death in the European Union (EU). CRC is an enormous health and economic burden. Early detection and prevention have the possibility of reducing this burden significantly. Many cancer-associated deaths can be avoided through early detection by high-quality colorectal screening programs followed by appropriate treatment. Under the auspices of the United European Gastroenterology Federation (UEGF), the European Association for Gastroenterology and Endoscopy, the Hungarian Society of Gastroenterology and the Hungarian College of Gastroenterology, the 'Budapest Declaration' (2011) was an accepted official scientific program during the Hungarian Presidency of the Council of the European Union. The Budapest Declaration follows the Munich Declaration (2001), the Brussels Declaration (2007), the Transatlantic Declaration (2009), the Barcelona Declaration (2010), the written declaration of CRC screening, a joint initiative with European Parliamentarians coordinated by the UEGF, and finally, the 'European Guidelines for Quality Assurance in Colorectal Cancer Screening and Diagnosis'. The 'Budapest Declaration' together with previous declarations aims to urge the national and supranational healthcare decision makers to launch new Europe-wide initiatives to establish high-quality CRC programs to achieve optimal efficiency in CRC screening. In case of implementation of the proposals, actions and conditions recommended, we can achieve that one of the basic principles of the EU - the chance of equal access - be realized in member states with respect to the prevention of CRC and reduction of cancer-related mortality. To better achieve this goal, we propose to establish an UEGF joint committee, with one participant representing each EU member state to coordinate and supervise the implementation of CRC screening. 相似文献
54.
55.
Terzin V Földesi I Kovács L Pokorny G Wittmann T Czakó L 《World journal of gastroenterology : WJG》2012,18(21):2649-2653
AIM: To investigate the association between autoimmune pancreatitis (AIP) and systemic autoimmune diseases (SAIDs) by measurement of serum immunoglobulin G4 (IgG4).METHODS: The serum level of IgG4 was measured in 61 patients with SAIDs of different types who had not yet participated in glucocorticosteroid treatment. Patients with an elevated IgG4 level were examined by abdominal ultrasonography (US) and, in some cases, by computer tomography (CT).RESULTS: Elevated serum IgG4 levels (919 ± 996 mg/L) were detected in 17 (28%) of the 61 SAID patients. 10 patients had Sjögren’s syndrome (SS) (IgG4: 590 ± 232 mg/L), 2 of them in association with Hashimoto’s thyroiditis, and 7 patients (IgG4: 1388 ± 985.5 mg/L) had systemic lupus erythematosus (SLE). The IgG4 level in the SLE patients and that in patients with SS were not significantly different from that in AIP patients (783 ± 522 mg/L). Abdominal US and CT did not reveal any characteristic features of AIP among the SAID patients with an elevated IgG4 level.CONCLUSION: The serum IgG4 level may be elevated in SAIDs without the presence of AIP. The determination of serum IgG4 does not seem to be suitable for the differentiation between IgG4-related diseases and SAIDs. 相似文献
56.
David Adlam BA BM BCh DPhil Nicholas Evans MB BCh Aneil Malhotra MA MB BCh Disha Midha BCom/BSc BM Felicity Rowley BSc BM BCh David Hutchings MB ChB Mirae Shin BM BCh Guy Mole BSc Alexander Stockenhuber Mark Lumb BM BCh Jonathan Wordsworth MA MB BCh Sophie Frantal MSc J. Colin Forfar MD PhD FRCP 《Catheterization and cardiovascular interventions》2012,80(4):539-545
Objectives : To investigate rates of and reasons for second and subsequent stent procedures in an unselected, “real‐world” population. Background : Repeat stenting is the primary difference reported in clinical trials of alternative revascularization strategies. The incidence, indication, and outcome for repeat stenting in contemporary practice outside the more selective populations of trials and registries has not been described. Method : All patients undergoing a first percutaneous coronary intervention (PCI) procedure with stenting from January 2001 to August 2009 (10,509) from a large UK tertiary referral and district general hospital were identified. Mortality and the incidence, timing, and indication for repeat revascularization in this population were investigated from patient records. Results : Of 10,509 patients undergoing a first PCI and stent implant 23.5% underwent repeat angiography of which 11.2% required repeat PCI and 2% coronary artery bypass grafting (median follow‐up of 3.8 years). A total of 1.3% went on to a third PCI. The commonest indication for repeat stenting was disease progression remote from the original stent (46%) and planned staged PCI (23%); 21% had a stent‐related indication. Functional assessment before repeat stenting was used in one‐third of stable patients. Mortality was 2.5% per annum. Conclusions : In contemporary practice, patients undergoing a first stenting procedure have a low subsequent mortality, and the substantial majority (86.4%) requires no further revascularization over a median 3.8 year follow‐up. For those who do require repeat stenting, this is most commonly at a site remote from the first stent. © 2012 Wiley Periodicals, Inc. 相似文献
57.
58.
Bianca C. Wittmann Geoffrey C. Tan John E. Lisman Raymond J. Dolan Emrah Düzel 《Neuropsychologia》2013
Previous studies have shown that appetitive motivation enhances episodic memory formation via a network including the substantia nigra/ventral tegmental area (SN/VTA), striatum and hippocampus. This functional magnetic resonance imaging (fMRI) study now contrasted the impact of aversive and appetitive motivation on episodic long-term memory. Cue pictures predicted monetary reward or punishment in alternating experimental blocks. One day later, episodic memory for the cue pictures was tested. We also investigated how the neural processing of appetitive and aversive motivation and episodic memory were modulated by dopaminergic mechanisms. To that end, participants were selected on the basis of their genotype for a variable number of tandem repeat polymorphism of the dopamine transporter (DAT) gene. The resulting groups were carefully matched for the 5-HTTLPR polymorphism of the serotonin transporter gene. Recognition memory for cues from both motivational categories was enhanced in participants homozygous for the 10-repeat allele of the DAT, the functional effects of which are not known yet, but not in heterozygous subjects. In comparison with heterozygous participants, 10-repeat homozygous participants also showed increased striatal activity for anticipation of motivational outcomes compared to neutral outcomes. In a subsequent memory analysis, encoding activity in striatum and hippocampus was found to be higher for later recognized items in 10-repeat homozygotes compared to 9/10-repeat heterozygotes. These findings suggest that processing of appetitive and aversive motivation in the human striatum involve the dopaminergic system and that dopamine plays a role in memory for both types of motivational information. In accordance with animal studies, these data support the idea that encoding of motivational events depends on dopaminergic processes in the hippocampus. 相似文献
59.
60.