全文获取类型
收费全文 | 94350篇 |
免费 | 5349篇 |
国内免费 | 158篇 |
专业分类
耳鼻咽喉 | 1313篇 |
儿科学 | 2996篇 |
妇产科学 | 2352篇 |
基础医学 | 13486篇 |
口腔科学 | 3228篇 |
临床医学 | 8881篇 |
内科学 | 18062篇 |
皮肤病学 | 2129篇 |
神经病学 | 9798篇 |
特种医学 | 3821篇 |
外科学 | 12795篇 |
综合类 | 397篇 |
一般理论 | 44篇 |
预防医学 | 6647篇 |
眼科学 | 1922篇 |
药学 | 6536篇 |
中国医学 | 195篇 |
肿瘤学 | 5255篇 |
出版年
2023年 | 563篇 |
2022年 | 603篇 |
2021年 | 1373篇 |
2020年 | 1125篇 |
2019年 | 1371篇 |
2018年 | 2330篇 |
2017年 | 1912篇 |
2016年 | 2305篇 |
2015年 | 2074篇 |
2014年 | 2516篇 |
2013年 | 4201篇 |
2012年 | 5548篇 |
2011年 | 5998篇 |
2010年 | 3170篇 |
2009年 | 2424篇 |
2008年 | 5601篇 |
2007年 | 5874篇 |
2006年 | 5583篇 |
2005年 | 5558篇 |
2004年 | 5211篇 |
2003年 | 5227篇 |
2002年 | 5044篇 |
2001年 | 3134篇 |
2000年 | 3750篇 |
1999年 | 2244篇 |
1998年 | 860篇 |
1997年 | 725篇 |
1996年 | 581篇 |
1995年 | 526篇 |
1994年 | 517篇 |
1993年 | 465篇 |
1992年 | 589篇 |
1991年 | 532篇 |
1990年 | 454篇 |
1989年 | 542篇 |
1988年 | 417篇 |
1987年 | 433篇 |
1986年 | 427篇 |
1985年 | 485篇 |
1984年 | 471篇 |
1983年 | 389篇 |
1982年 | 391篇 |
1981年 | 339篇 |
1980年 | 284篇 |
1979年 | 353篇 |
1978年 | 272篇 |
1977年 | 314篇 |
1976年 | 264篇 |
1975年 | 258篇 |
1973年 | 257篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
Lars von Knorring Béla G. L. Almay Jan Häggendal Folke Johansson Lars Oreland Lennart Wetterberg 《European archives of psychiatry and clinical neuroscience》1986,236(3):131-138
Summary The aim of the present study was to investigate the discriminative power of a series of variables (including determination of depressive symptomatology by means of a visual analogue scale, determination of personality traits by means of the Karolinska Scales of Personality, determination of monoamine metabolites in CSF, platelet MAO activities, serum cortisol before and after dexamethasone suppression and urinary melatonin) in differentiating (a) chronic pain patients from healthy subjects, and (b) patients with idiopathic pain syndromes from patients with neurogenic pain syndromes. Separately each of the measures gave a significant but often low contribution to the discrimination, while a combination of several measures gave a complete discrimination both between healthy subjects and patients with chronic pain syndromes and between patients with idiopathic and neurogenic pain syndromes, respectively.Supported in part by grants from the Swedish Medical Research Council (grants no. 3371, 4145 and 5740) and by a grant from Stiftelsen Söderström-Königska Sjukhemmet 相似文献
62.
63.
Raúl González-García Francisco J Rodríguez-Campo Verónica Escorial-Hernández Mario F Mu?oz-Guerra Jesús Sastre-Pérez Luis Naval-Gías José L Gil-Díez Usandizaga 《Journal of oral and maxillofacial surgery》2006,64(11):1587-1591
PURPOSE: Temporomandibular joint (TMJ) arthroscopy has been considered a safe surgical procedure in the treatment of TMJ derangement. However, it is not exempt from complications. This study evaluates the complications of arthroscopy in patients with internal derangement of TMJ. PATIENTS AND METHODS: Five hundred consecutive patients (670 joints) with TMJ derangement who underwent arthroscopy between 1995 and 2004 were retrospectively analyzed. All the patients were classified as II to V in the Wilkes classification. Lysis and lavage, electrocautery of the posterior ligament, injection of corticoids, injection of ethanolamine, myotomy of lateral pterygoid muscle attachments, myotomy and electrocautery, motor debridement, injection of sodium hyaluronate, and meniscal suture were performed in different patients. RESULTS: Complications were recognized during or immediately after the surgery. They were observed in 5 of 341 (1.26%) arthroscopies of the right TMJ and 4 of 329 (1.21%) arthroscopies of the left TMJ. A 1.34% complication rate was found in the whole series. No blood clots within the external auditory canal were observed. Bleeding within the superior TMJ space was observed in 57 cases (8.5%), 36 of them in the right TMJ and 21 in the left TMJ, but they were not considered as true complications. Lacerations of the external auditory canal were found in 2 cases (0.3%), with no cases of perforation of the tympanic membrane. Lesion of the auriculotemporal nerve was observed in a case. Paresia of the facial nerve was found in 4 cases (0.6%). Alteration of visual accuracy of the ipsilateral eye was also observed in a patient immediately after the surgery. CONCLUSION: Special care must be taken to reduce complications within the upper joint space by means of an adequate instrumentation and by paying attention to essential points of the arthroscopic technique. 相似文献
64.
Effect of impact exercise on bone mineral density in elderly women with low BMD: a population-based randomized controlled 30-month intervention 总被引:4,自引:3,他引:1
Raija Korpelainen Sirkka Keinänen-Kiukaanniemi Jorma Heikkinen Kalervo Väänänen Juha Korpelainen 《Osteoporosis international》2006,17(1):109-118
Evidence of the effect of exercise on bone loss comes mainly from studies in voluntary postmenopausal women, and no population-based, long-term interventions have been performed. The purpose of this population-based, randomized, controlled trial was to determine the effect of long-term impact exercise on bone mass at various skeletal sites in elderly women with low bone mineral density (BMD) at the radius and hip. Participants ( n =160) were randomly assigned to 30 months either of supervised and home-based impact exercise training or of no intervention. The primary outcome measures were femoral neck, trochanter and total hip BMD, and the secondary outcomes were bone density measures at the radius and calcaneum. Outcomes were assessed at baseline, 12 months and 30 months using blinded operators. The analyses were performed on an intention-to-treat analysis. Mean femoral neck and trochanter BMD decreased in the control group [–1.1%, 95% confidence interval (CI) –0.1% to –2.1% and –1.6%, 95% CI –0.4% to –2.7%], while no change occurred in the exercise group. Mean trochanter BMC decreased more in the control group (–7.7%, 95% CI –9.7% to –5.6% vs. –2.9%, 95% CI –5.3 to –0.9). There were six falls that resulted in fractures in the exercise group and 16 in the control group during the 30-month intervention ( P =0.019). A significant bone loss occurred in both groups at the radius and calcaneum. In multivariate analysis, weight gain was associated with increased BMD and BMC at all femur sites both in the exercise group and in the pooled groups. In conclusion, impact exercise had no effect on BMD, while there was a positive effect on BMC at the trochanter. Exercise may prevent fall-related fractures in elderly women with low bone mass.There was no conflict of interest. 相似文献
65.
Catherine Guette Christian Legros Guewen Tournois Max Goyffon Marie-Louise Célérier 《Toxicon》2006,47(6):640-649
In order to establish a venom fingerprint and a peptide profile of the Lasiodora parahybana tarantula venom gland, we used conventional methods such as reversed phase liquid chromatography coupled to an electrospray-ionisation hybrid quadrupole time of flight mass spectrometer (LC/ESI-QqTOFMS), matrix-assisted laser desorption/ionization time-of-flight-MS (MALDI-TOFMS) and direct study of L. parahybana venom by nanospray-ionization QqTOFMS (nanoESI-QqTOFMS) and a new technology for the direct analysis of fresh tissues using MALDI-TOFMS. The analysis of the crude venom allowed the characterization of specific juvenile and adult biomarkers. In situ MALDI analysis of L. parahybana venom gland sections revealed different peptide expression levels all along the gland and non-processed peptide precursors, demonstrating the power of the method for the dynamic investigation of peptide evolution in the venom gland of spiders. 相似文献
66.
Birgitta Malmberg Göran Kecklund Björn Karlson Roger Persson Per Flisberg Palle Ørbaek 《BMC health services research》2010,10(1):239
Background
It is well known that physicians' night-call duty may cause impaired performance and adverse effects on subjective health, but there is limited knowledge about effects on sleep duration and recovery time. In recent years occupational stress and impaired well-being among anaesthesiologists have been frequently reported for in the scientific literature. Given their main focus on handling patients with life-threatening conditions, when on call, one might expect sleep and recovery to be negatively affected by work, especially in this specialist group. The aim of the present study was to examine whether a 16-hour night-call schedule allowed for sufficient recovery in anaesthesiologists compared with other physician specialists handling less life-threatening conditions, when on call. 相似文献67.
Prof. Dr. C. Haasen A. Kutzer I. Schäfer 《Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz》2010,53(4):267-270
In the past, addiction disorders were considered to be mainly substance use disorders. The main focus has been on dependence disorders. Dependence criteria do not differ substantially in the two main classification systems ICD and DSM, while harmful use (ICD) and abuse (DSM) criteria show much less concordance. Presently diagnostic criteria for behavioral addiction disorders are only available for pathological gambling, however, under the category of disorders of impulse control, while other disorders have to be categorized under disorders not otherwise specified. Evidence of neurobiological similarities implies that future ICD and DSM revisions, in addition to other needed changes, will group behavioral addiction and substance use disorders together. 相似文献
68.
69.
70.