全文获取类型
收费全文 | 4671篇 |
免费 | 318篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 105篇 |
儿科学 | 147篇 |
妇产科学 | 91篇 |
基础医学 | 584篇 |
口腔科学 | 185篇 |
临床医学 | 458篇 |
内科学 | 1008篇 |
皮肤病学 | 77篇 |
神经病学 | 531篇 |
特种医学 | 155篇 |
外科学 | 685篇 |
综合类 | 52篇 |
一般理论 | 1篇 |
预防医学 | 270篇 |
眼科学 | 44篇 |
药学 | 203篇 |
中国医学 | 8篇 |
肿瘤学 | 413篇 |
出版年
2023年 | 46篇 |
2022年 | 105篇 |
2021年 | 163篇 |
2020年 | 103篇 |
2019年 | 129篇 |
2018年 | 144篇 |
2017年 | 87篇 |
2016年 | 145篇 |
2015年 | 126篇 |
2014年 | 171篇 |
2013年 | 203篇 |
2012年 | 336篇 |
2011年 | 340篇 |
2010年 | 183篇 |
2009年 | 171篇 |
2008年 | 267篇 |
2007年 | 253篇 |
2006年 | 254篇 |
2005年 | 220篇 |
2004年 | 222篇 |
2003年 | 207篇 |
2002年 | 183篇 |
2001年 | 59篇 |
2000年 | 66篇 |
1999年 | 52篇 |
1998年 | 35篇 |
1997年 | 34篇 |
1996年 | 42篇 |
1995年 | 29篇 |
1994年 | 32篇 |
1993年 | 32篇 |
1992年 | 46篇 |
1991年 | 44篇 |
1990年 | 34篇 |
1989年 | 34篇 |
1988年 | 29篇 |
1987年 | 26篇 |
1986年 | 32篇 |
1985年 | 25篇 |
1984年 | 29篇 |
1983年 | 30篇 |
1982年 | 21篇 |
1981年 | 24篇 |
1980年 | 18篇 |
1979年 | 15篇 |
1978年 | 16篇 |
1977年 | 16篇 |
1975年 | 15篇 |
1974年 | 12篇 |
1972年 | 17篇 |
排序方式: 共有5017条查询结果,搜索用时 15 毫秒
101.
Regina Böll Katrin Romanek Sabrina Schmoll Raphael Stich Armin Ott Jochen Stenzel 《Clinical toxicology (Philadelphia, Pa.)》2018,56(7):664-666
Objective: To independently validate the predictive value of the intensive care requirement score (IRS) in unselected poisoned patients.Design: Retrospective chart review.Patients and methods: Five hundred and seventeen out of 585 admissions for acute intoxications could be analyzed. Eleven were excluded for a condition already requiring intensive care unit (ICU) support at admission (e.g., preclinical intubation). A further 57 admissions were excluded due to missing data. The IRS was calculated using a point-scoring system including age, Glasgow Coma Scale, heart rate, type of intoxication, and preexisting conditions. It was then compared to a composite endpoint indicating an ICU requirement (death in hospital, vasopressors, need for ventilation). The endpoint and the point-scoring system were identical to the original publication of the score.Results and conclusion: Twenty-three out of 517 patients had a complicated clinical course as defined by meeting the endpoint definition. Twenty-one out of 23 complicated courses had a positive IRS (defined as greater or equal 6 points), as compared to 255/494 patients with an uncomplicated clinical course (p?.001, Fisher’s exact test). One patient (with a positive IRS) died. The negative predictive value of the IRS was 0.99 (95% CI: 0.97–1), the sensitivity was 0.91 and the specificity 0.48. In conclusion, the IRS is significantly linked to outcome. While a negative IRS virtually excludes the need for ICU care, a positive IRS has a positive predictive value too low to be used for risk stratification. The IRS could also be applied to unselected admissions of poisoned patients. 相似文献
102.
103.
Timm Harder Sebastian Maurer-Stroh Anne Pohlmann Elke Starick Detlef H?reth-B?ntgen Karin Albrecht Gunter Pannwitz Jens Teifke Vithiagaran Gunalan Raphael T.C. Lee Carola Sauter-Louis Timo Homeier Christoph Staubach Carola Wolf Günter Strebelow Dirk H?per Christian Grund Franz J. Conraths Thomas C. Mettenleiter Martin Beer 《Emerging infectious diseases》2015,21(5):860-863
Highly pathogenic avian influenza (H5N8) virus, like the recently described H5N8 strain from Korea, was detected in November 2014 in farmed turkeys and in a healthy common teal (Anas crecca) in northeastern Germany. Infected wild birds possibly introduced this virus. 相似文献
104.
105.
Orwa Dandash Ben J Harrison Ram Adapa Raphael Gaillard Francesco Giorlando Stephen J Wood Paul C Fletcher Alex Fornito 《Neuropsychopharmacology》2015,40(3):622-631
The psychotomimetic effect of the N-methyl-D-aspartate receptor (NMDAR) antagonist ketamine is thought to arise from a functional modulation of the brain''s fronto-striato-thalamic (FST) circuits. Animal models suggest a pronounced effect on ventral ‘limbic'' FST systems, although recent work in patients with psychosis and high-risk individuals suggests specific alterations of dorsal ‘associative'' FST circuits. Here, we used functional magnetic resonance imaging to investigate the effects of a subanesthetic dose of ketamine on measures of functional connectivity as indexed by the temporal coherence of spontaneous neural activity in both dorsal and ventral FST circuits, as well as their symptom correlates. We adopted a placebo-controlled, double-blind, randomized, repeated-measures design in which 19 healthy participants received either an intravenous saline infusion or a racemic mixture of ketamine (100 ng/ml) separated by at least 1 week. Compared with placebo, ketamine increased functional connectivity between the dorsal caudate and both the thalamus and midbrain bilaterally. Ketamine additionally increased functional connectivity of the ventral striatum/nucleus accumbens and ventromedial prefrontal cortex. Both connectivity increases significantly correlated with the psychosis-like and dissociative symptoms under ketamine. Importantly, dorsal caudate connectivity with the ventrolateral thalamus and subthalamic nucleus showed inverse correlation with ketamine-induced symptomatology, pointing to a possible resilience role to disturbances in FST circuits. Although consistent with the role of FST in mediating psychosis, these findings contrast with previous research in clinical samples by suggesting that acute NMDAR antagonism may lead to psychosis-like experiences via a mechanism that is distinct from that implicated in frank psychotic illness. 相似文献
106.
O Fain B Wechsler M Vidailhet M Raphael E Schuller P Godeau 《La Revue de médecine interne / fondée ... par la Société nationale francaise de médecine interne》1992,13(1):58-60
We report the case of a 68-year old woman complaining of disorders of memory and persistent headaches in whom the diagnosis of Waldenstr?m's macroglobulinaemia (WM) was made. Computerized tomography of the brain showed a butterfly-shaped hyperdensity in the splenium of the corpus callosum, with ventricular dilatation. Magnetic resonance imaging displayed high-intensity signals on T2-weighted sequences. Protein immunoelectrophoresis elicited an IgM kappa peak. The CSF was found to contain proteins and lymphocytes in excess, and immunohistochemical staining confirmed the predominance of anti-kappa and the presence of intrathecal IgM secretion. Chemotherapy was temporarily effective on the memory disorders, but the patient died 26 months after the beginning of treatment. Central nervous system manifestations are seldom observed in WM, and they are now grouped under the name of Bing-Neel syndrome. Psychic disorders are rarely reported. It is suggested that IgM secretion plays a predominant role in the pathogenesis of leucoencephalitis, and this is supported by the finding of intrathecal IgM synthesis. 相似文献
107.
Radaelli Régis Brusco Clarissa M. Machado Carlos Leonardo Figueiredo Martins Dominique Sakugawa Raphael Luiz Diefenthaeler Fernando Pinto Ronei S. 《Sport Sciences for Health》2022,18(2):455-462
Sport Sciences for Health - The generalized joint hypermobility (GJH) syndrome is a condition characterized by a connective tissue disorder that may negatively affect the muscle function and muscle... 相似文献
108.
Thoracoscopic surgery in elderly lung cancer patients 总被引:10,自引:0,他引:10
Age is a recognized risk factor for death after thoracotomy in elderly patients with lung cancer. Among other factors, the genesis of this risk is the physiologic debilitation that occurs after division of the intrathoracic respiratory muscles during thoracotomy, as well as the loss of lung tissue after lung resection. Recent advances in video-assisted thoracic surgery (VATS) techniques provide an alternative to standard thoracotomy in elderly lung cancer patients, resulting in decreased recovery times and fewer perioperative complications. Likewise, smaller lung resections (VATS-guided limited wedge resection versus lobectomy with thoracotomy) can be adequate oncologic procedures in patients with a limited life expectancy but resectable disease. We studied these alternative procedures in a cohort of thoracic surgical patients at the Brigham and Women's Hospital in Boston, MA. Proposed investigations of the psychosocial implications of thoracic surgery in the elderly, irrespective of the safety of these maneuvers, are addressed. 相似文献
109.
Pathophysiology of rhinitis. 1. Assessment of the sources of protein in methacholine-induced nasal secretions 总被引:9,自引:0,他引:9
G D Raphael H M Druce J N Baraniuk M A Kaliner 《The American review of respiratory disease》1988,138(2):413-420
Nasal provocation tests with normal saline and methacholine (MC) were performed in 25 atopic and 27 nonatopic subjects in an effort to assess the sources of protein in induced airway secretions. Nasal lavages obtained at baseline and after provocation were analyzed for albumin, total protein, secretory IgA (sIgA), and total IgA. Compared with baseline levels or saline provocation, MC provocation increased the secretion of albumin (p less than 0.025), total protein (p less than 0.001), sIgA (p less than 0.025), and total IgA (p less than 0.025), but did not significantly affect the relative proportions of albumin-to-total protein (albumin percent) or sIgA-to-total IgA (sIgA/total IgA ratio). Nasal pretreatment with atropine significantly inhibited MC-induced secretion of all 4 proteins, again without affecting the albumin percent or the sIgA/total IgA ratio. Because MC is known to stimulate atropine-inhibitable secretion of glandular products, these data suggest that sIgA and albumin may accompany glandular secretions. Immunohistochemical analyses of nasal turbinates confirmed that secretory component was found only on serous cells within submucous glands. Thus, it appears that cholinergic stimulation may regulate sIgA secretion and thereby participate in local nasal (and possibly respiratory tract) immunity. 相似文献
110.
Flechtner I Vaxillaire M Cavé H Scharfmann R Froguel P Polak M 《Best Practice & Research: Clinical Endocrinology & Metabolism》2008,22(1):17-40
Transient and permanent neonatal diabetes mellitus (TNDM and PNDM) are rare conditions occurring in around 1 per 300,000 live births. In TNDM, growth-retarded infants develop diabetes in the first few weeks of life, only to go into remission after a few months with possible relapse to permanent diabetes usually around adolescence or in adulthood. In PNDM, insulin secretory failure occurs in the late fetal or early postnatal period. The very recently elucidated mutations in KCNJ11 and ABCC8 genes, encoding the Kir6.2 and SUR1 subunits of the pancreatic K(ATP) channel involved in regulation of insulin secretion, account for a third to a half of the PNDM cases. Molecular analysis of chromosome 6 anomalies and the KCNJ11 and ABCC8 genes encoding Kir6.2 and SUR1 provides a tool for distinguishing transient from permanent neonatal diabetes mellitus in the neonatal period. Some patients (those with mutations in KCNJ11 and ABCC8) may be transferred from insulin therapy to sulphonylureas. 相似文献