全文获取类型
收费全文 | 6101篇 |
免费 | 401篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 63篇 |
儿科学 | 93篇 |
妇产科学 | 150篇 |
基础医学 | 793篇 |
口腔科学 | 61篇 |
临床医学 | 676篇 |
内科学 | 1446篇 |
皮肤病学 | 76篇 |
神经病学 | 534篇 |
特种医学 | 230篇 |
外科学 | 997篇 |
综合类 | 39篇 |
预防医学 | 325篇 |
眼科学 | 113篇 |
药学 | 387篇 |
中国医学 | 5篇 |
肿瘤学 | 551篇 |
出版年
2024年 | 9篇 |
2023年 | 59篇 |
2022年 | 85篇 |
2021年 | 235篇 |
2020年 | 162篇 |
2019年 | 219篇 |
2018年 | 262篇 |
2017年 | 170篇 |
2016年 | 181篇 |
2015年 | 160篇 |
2014年 | 251篇 |
2013年 | 327篇 |
2012年 | 490篇 |
2011年 | 405篇 |
2010年 | 248篇 |
2009年 | 236篇 |
2008年 | 365篇 |
2007年 | 368篇 |
2006年 | 364篇 |
2005年 | 339篇 |
2004年 | 283篇 |
2003年 | 261篇 |
2002年 | 259篇 |
2001年 | 80篇 |
2000年 | 64篇 |
1999年 | 57篇 |
1998年 | 59篇 |
1997年 | 49篇 |
1996年 | 48篇 |
1995年 | 41篇 |
1994年 | 27篇 |
1993年 | 15篇 |
1992年 | 29篇 |
1991年 | 30篇 |
1990年 | 28篇 |
1989年 | 29篇 |
1988年 | 24篇 |
1987年 | 21篇 |
1986年 | 21篇 |
1985年 | 17篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1976年 | 10篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1972年 | 12篇 |
1970年 | 11篇 |
1969年 | 9篇 |
排序方式: 共有6539条查询结果,搜索用时 31 毫秒
61.
Merviel P Mergui JL Sananes S Antoine JM Salat-Baroux J Uzan S 《Presse medicale (Paris, France : 1983)》2000,29(23):1302-1310
UTERINE DISORDERS: Because they can prevent implantation, anomalies within the uterine cavity play an important role in fertility. The uterine disorders most often observed during hysteroscopy and implicated in infertility are adhesions, septa, polyps, submucous myomas, adenomyosis, endometritis, anomalies of the cervical canal, and lesions of the uterotubal junction. EXPLORATIONS: Hysterosalpingography can be used to evaluate tubal permeability but provides inadequate information about the uterine cavity (numerous false-positives and false-negatives). Pelvic ultrasound is especially helpful for diagnosing interstitial anomalies in the uterus. HYSTEROSCOPY: Diagnostic hysteroscopy also has a place in infertility investigations, for it allows direct visualization of the uterine cavity, the endometrial mucus (endometritis, adenomyosis), and the cervical canal. The examination is practiced on a out-patient basis, without anesthesia, using appropriate small-caliber instruments and irrigation with physiological saline. Surgical hysteroscopy is used to treat these anomalies. Patients receive general anesthesia. A high-frequency, low-voltage electric current is used, and glycine for irrigation. This procedure allows resection of submucous myomas and polyps and of septa and adhesions. Some groups use laser beams and irrigation by physiological saline for these treatments. Coagulation of a superficial focal spot of adenomyosis is not useful in infertility therapy. RESULTS: As assessed by the percentage of patients with each indication who subsequently became pregnant, the results of surgical hysteroscopy have been satisfactory: 62 per cent (%) of cases after myomectomy, 66% after section of uterine septa, and 61% after treatment of complicated adhesions. A new exploration of the uterine cavity will be necessary sometime after the surgery to verify the absence of any iatrogenic disorders (adhesions, myomatous fragments). 相似文献
62.
Arnal MA Mosoni L Boirie Y Houlier ML Morin L Verdier E Ritz P Antoine JM Prugnaud J Beaufrère B Mirand PP 《The Journal of nutrition》2000,130(7):1700-1704
This study was undertaken to determine whether a pulse protein feeding pattern was more efficient than a spread pattern to improve protein anabolism in young women as was already shown in elderly women. After a 15-d adaptive period [1.2 g protein/(kg fat-free mass. d)], 16 young women (age 26 +/- 1 y) were given a 14-d diet providing 1.7 g protein/(kg fat-free mass. d), using either a pulse pattern (protein consumed mainly in one meal, n = 8), or a spread pattern (spreading daily protein intake over four meals, n = 8). Nitrogen balance was determined at the end of both the 15-d adaptive and the 14-d experimental periods. Whole-body protein turnover was determined at the end of the 14-d experimental period using [(15)N]glycine as an oral tracer. Nitrogen balance was 17 +/- 5 mg N/(kg fat-free mass. d) during the adaptive period. It was higher during the experimental period, but not significantly different in the women fed the spread or the pulse patterns [59 +/- 12 and 36 +/- 8 mg N/(kg fat-free mass. d) respectively]. No significant effects of the protein feeding pattern were detected on either whole-body protein turnover [5.5 +/- 0.2 vs. 6.1 +/- 0.3 g protein/(kg fat-free mass. d) for spread and pulse pattern, respectively] or whole-body protein synthesis and protein breakdown. Thus, in young women, these protein feeding patterns did not have significantly different effects on protein retention. 相似文献
63.
Véronique Lenoir Marianne Beau Yon de Jonage-Canonico Marie-Hélène Perrin Antoine Martin Robert Scholler Bernard Kerdelhué 《Breast cancer research : BCR》2005,7(4):R470
Introduction
It has been well documented that the pineal hormone, melatonin, which plays a major role in the control of reproduction in mammals, also plays a role in the incidence and growth of breast and mammary cancer. The curative effect of melatonin on the growth of dimethylbenz [a]anthracene-induced (DMBA-induced) mammary adenocarcinoma (ADK) has been previously well documented in the female Sprague-Dawley rat. However, the preventive effect of melatonin in limiting the frequency of cancer initiation has not been well documented. 相似文献64.
65.
66.
Farhana Shariff Danielle Bischof Anand Govindarajan Rebecca Prince Ronald Burkes Erika Haase Lloyd Mack Walley Temple Pamela Hebbard Cindy Boulanger-Gobeil Carman Giacomantonio Alexandre BrindAmour Lucas Sidris Pierre Dub Trevor Hamilton Andrea MacNeill Antoine Bouchard-Fortier Rami Younan Andrea McCart 《Current oncology (Toronto, Ont.)》2021,28(1):40
Background: The COVID-19 pandemic has put enormous pressure on hospital resources, and has affected all aspects of patient care. As operative volumes decrease, cancer surgeries must be triaged and prioritized with careful thought and attention to ensure maximal benefit for the maximum number of patients. Peritoneal malignancies present a unique challenge, as surgical management can be resource intensive, but patients have limited non-surgical treatment options. This review summarizes current data on outcomes and resource utilization to help inform decision-making and case prioritization in times of constrained health care resources. Methods: A rapid literature review was performed, examining surgical and non-surgical outcomes data for peritoneal malignancies. Narrative data synthesis was cross-referenced with relevant societal guidelines. Peritoneal malignancy surgeons and medical oncologists reviewed recommendations to establish a national perspective on case triage and mitigating treatment strategies. Results and Conclusions: Triage of peritoneal malignancies during this time of restricted health care resource is nuanced and requires multidisciplinary discussion with consideration of individual patient factors. Prioritization should be given to patients where delay may compromise resectability of disease, and where alternative treatment options are lacking. Mitigating strategies such as systemic chemotherapy and/or surgical deferral may be utilized with close surveillance for disease stability or progression, which may affect surgical urgency. Unique hospital capacity, and ability to manage the complex post-operative course for these patients must also be considered to ensure patient and system needs are aligned. 相似文献
67.
Thibaud Pintiaux David Viet Virginie Vandenbossche Luc Rigal Antoine Rouilly 《Materials》2013,6(6):2240-2261
Commercial α-cellulose was compression-molded to produce 1A dog-bone specimens under various operating conditions without any additive. The resulting agromaterials exhibited a smooth, plastic-like surface, and constituted a suitable target as replacement for plastic materials. Tensile and three-points bending tests were conducted according to ISO standards related to the evaluation of plastic materials. The specimens had strengths comparable to classical petroleum-based thermoplastics. They also exhibited high moduli, which is characteristic of brittle materials. A higher temperature and higher pressure rate produced specimens with higher mechanical properties while low moisture content produced weaker specimens. Generally, the strong specimen had higher specific gravity and lower moisture content. However, some parameters did not follow the general trend e.g., thinner specimen showed much higher Young’s Modulus, although their specific gravity and moisture content remained similar to control, revealing a marked skin-effect which was confirmed by SEM observations. 相似文献
68.
69.
Benjamin V. Sandholt Antoine Collet-Billon Robert Entrekin Henrik H. Sillesen 《Ultrasound in medicine & biology》2018,44(3):670-676
We tested a novel 3-D matrix transducer with respect to inter-scan reproducibility of carotid maximum plaque thickness (MPT) and volume measurements. To improve reproducibility while focusing on the largest plaque/most diseased part of the carotid artery, we introduced a new partial plaque volume (PPV) measure centered on MPT. Total plaque volume (TPV), PPV from a 10-mm segment and MPT were measured using dedicated semi-automated software on 38 plaques from 26 patients. Inter-scan reproducibility was assessed using the t-test, Bland–Altman plots and Pearson's correlation coefficient. There was a mean difference of 0.01?mm in MPT (limits of agreement: ?0.45 to 0.42?mm, Pearson's correlation coefficient: 0.96). Both volume measurements exhibited high reproducibility, with PPV being superior (limits of agreement: ?35.3?mm3 to 33.5?mm3, Pearson's correlation coefficient: 0.96) to TPV (limits of agreement: ?88.2 to 61.5?mm3, Pearson's correlation coefficient: 0.91). The good reproducibility revealed by the present results encourages future studies on establishing plaque quantification as part of cardiovascular risk assessment and for follow-up of disease progression over time. 相似文献
70.