全文获取类型
收费全文 | 3096篇 |
免费 | 188篇 |
国内免费 | 71篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 80篇 |
妇产科学 | 32篇 |
基础医学 | 516篇 |
口腔科学 | 49篇 |
临床医学 | 218篇 |
内科学 | 327篇 |
皮肤病学 | 31篇 |
神经病学 | 745篇 |
特种医学 | 140篇 |
外科学 | 194篇 |
综合类 | 294篇 |
预防医学 | 134篇 |
眼科学 | 153篇 |
药学 | 225篇 |
1篇 | |
中国医学 | 70篇 |
肿瘤学 | 49篇 |
出版年
2023年 | 29篇 |
2022年 | 63篇 |
2021年 | 76篇 |
2020年 | 97篇 |
2019年 | 80篇 |
2018年 | 85篇 |
2017年 | 74篇 |
2016年 | 71篇 |
2015年 | 87篇 |
2014年 | 135篇 |
2013年 | 174篇 |
2012年 | 163篇 |
2011年 | 142篇 |
2010年 | 112篇 |
2009年 | 146篇 |
2008年 | 141篇 |
2007年 | 160篇 |
2006年 | 131篇 |
2005年 | 98篇 |
2004年 | 116篇 |
2003年 | 106篇 |
2002年 | 72篇 |
2001年 | 61篇 |
2000年 | 73篇 |
1999年 | 37篇 |
1998年 | 56篇 |
1997年 | 55篇 |
1996年 | 45篇 |
1995年 | 39篇 |
1994年 | 40篇 |
1993年 | 37篇 |
1992年 | 46篇 |
1991年 | 43篇 |
1990年 | 42篇 |
1989年 | 34篇 |
1988年 | 28篇 |
1987年 | 35篇 |
1986年 | 27篇 |
1985年 | 35篇 |
1984年 | 40篇 |
1983年 | 24篇 |
1982年 | 33篇 |
1981年 | 28篇 |
1980年 | 31篇 |
1979年 | 17篇 |
1978年 | 25篇 |
1977年 | 15篇 |
1976年 | 11篇 |
1975年 | 9篇 |
1973年 | 8篇 |
排序方式: 共有3355条查询结果,搜索用时 15 毫秒
51.
Arabella K. Raupach Kaylena A. Ehgoetz Martens Negar Memarian George Zhong Elie Matar Glenda M. Halliday Ronald Grunstein Simon J.G. Lewis 《Journal of sleep research》2020,29(5)
The vast majority of patients with idiopathic rapid eye movement sleep behaviour disorder will develop a neurodegenerative α‐synuclein‐related condition, such as Parkinson’s disease or dementia with Lewy bodies. The pathology underlying dream enactment overlaps anatomically with the brainstem regions that regulate circadian core body temperature. Previously, nocturnal core body temperature regulation has been shown to be impaired in Parkinson’s disease. However, no study to date has investigated nocturnal core body temperature changes in patients with idiopathic rapid eye movement sleep behaviour disorder, which may prove to be an early objective biomarker for α‐synucleinopathies. Ten healthy controls, 15 patients with idiopathic rapid eye movement sleep behaviour disorder, 31 patients with Parkinson’s disease and six patients with dementia with Lewy bodies underwent clinical assessment and nocturnal polysomnography with core body temperature monitoring. A validated cosinor method was utilised for core body temperature analysis. No differences in mesor, nadir or time of nadir were observed between groups. However, when compared with healthy controls, the amplitude of the nocturnal core body temperature (mesor minus nadir) was significantly reduced in patients with idiopathic rapid eye movement sleep behaviour disorder, Parkinson’s disease with concurrent rapid eye movement sleep behaviour disorder and dementia with Lewy bodies (p < 0.001, p = 0.043 and p = 0.017, respectively). Importantly, this relationship was not seen in those patients with Parkinson’s disease without rapid eye movement sleep behaviour disorder. In addition, there was a significant negative correlation between amplitude of the core body temperature and self‐reported rapid eye movement sleep behaviour disorder symptoms. Changes in thermoregulatory circadian rhythm may be specifically associated with the pathology underlying rapid eye movement sleep behaviour disorder rather than simply that of α‐synucleinopathy. These findings implicate thermoregulatory dysfunction as a potential early biomarker for development of rapid eye movement sleep behaviour disorder‐associated neurodegeneration, and suggest that subpopulations with differing pathological underpinnings might exist in Parkinson’s disease. 相似文献
52.
53.
Birds in the genus Pitohui and Ifrita carry potent neurotoxins that are most abundant in skin and feathers. It was unknown precisely how or where in the skin these chemicals are stored. Here, we report high‐resolution electron microscopy using OsO4 staining to visualize the location of alkaloids. Our images suggest that toxic alkaloids accumulate in multigranular bodies of epidermal cells and are likely secreted as part of the avian epidermal barrier, where they are made available for chemical defense. 相似文献
54.
M. Mounir M. Atef A. Abou-Elfetouh M.M. Hakam 《International journal of oral and maxillofacial surgery》2018,47(5):658-664
The aim of this study was to assess two new protocols for single-stage rehabilitation of the severely atrophic maxillary ridge using customized porous titanium or polyether ether ketone (PEEK) sub-periosteal implants. Ten patients with a severely atrophic anterior maxillary alveolar ridge were divided randomly into two groups (five patients in each) to receive customized sub-periosteal implants fabricated via CAD/CAM technology: group 1, porous titanium implants; group 2, PEEK implants. Prosthetic loading with fixed acrylic bridges was performed 1 month postoperative. The implants were followed-up for 12 months and evaluated for the presence of any sign of radiographic bone resorption, mobility, infection, prosthetic fracture, or implant exposure. The immediate postoperative period was uneventful except for one case complicated by wound dehiscence in group 1. At 12 months, all implants were functionally stable and the patients were comfortable with the prostheses. No signs of radiographic bone resorption, mobility, infection, or prosthetic fracture were observed. Within the limitations of this study, the application of customized porous titanium and PEEK sub-periosteal implants produced through CAD/CAM technology appears to be an acceptable method for single-stage prosthetic rehabilitation of the severely atrophic edentulous anterior maxilla.This study was awarded the best case study at the academy of osseintegration annual meeting 2017, Orlando, Florida. 相似文献
55.
《Scandinavian journal of gastroenterology》2013,48(6):522-526
The arterial ketone body ratio (acetoacetate to β-hydroxybutyrate) was measured in 15 patients with chronic liver disease before and after the infusion of anticancer drugs or embolic agents (gelatin sponge or iodized oil) into the hepatic artery. The arterial ketone body ratio decreased after hepatic angiography and decreased further at 15 min after infusion therapy. When the arterial ketone body ratio decreased to 1.0 or less on at least one occasion after infusion therapy, the ratio after hepatic angiography was always 1.35 or less. Such patients developed marked systemic symptoms like fever and severe liver dysfunction. Ascites also developed in three patients in whom the arterial ketone body ratio was reduced to 0.7 or less at 24 h after infusion therapy. The arterial ketone body ratios improved at 3–7 days after infusion therapy. In the seven patients treated with gelatin sponge embolization, the ratio at 3–7 days after therapy was actually higher than that before angiography. 相似文献
56.
Harunobu Sato Tetsuya Tsukamoto Yoshihisa Mizuno Tomoaki Ichikawa Yoshihito Kotani Katsuyuki Honda Kouhei Hatta Makoto Kuroda 《Digestive endoscopy》2014,26(6):749-751
Malakoplakia in the gastrointestinal tract is rare in healthy young people without underlying disease. Sufficient tissue is required for accurate diagnosis. We describe a malakoplakia that developed in a healthy young woman and was treated by endoscopic mucosal resection (EMR). A 40‐year‐old woman with a history of taking oral contraceptives until one year earlier was referred to our hospital with anal bleeding and constipation. A colonoscopy carried out at our another hospital 18 months earlier disclosed no abnormal findings. Colonoscopy at presentation revealed a yellowish‐white tumor, 5 mm in diameter, in the rectum. The lesion was slightly protruded and had a smooth flat surface, without erosion or ulceration. EMR was carried out for a definitive diagnosis. Histopathological examination showed that the tumor contained granular histiocytes, positive for CD68 and negative forcytokeratin (AE1/AE3). Several histiocytes contained intracytoplasmic round bodies (Michaelis–Gutmann bodies), which reacted positively with periodic acid‐Schiff and calcium (Von Kossa) stains. Intracytoplasmic Escherichia coli (von Hansemann bodies) were identified by Giemsa staining. Based on these results, the tumor in the rectum was diagnosed as a malakoplakia. Following EMR, the patient did not receive further treatment for malakoplakia because she had no symptoms associated with malakoplakia. She has been well for more than 9 months, with no symptoms of disease. Awareness of colorectal malakoplakia is important in patients taking steroids, including oral contraceptives. 相似文献
57.
Gregor K. Wenning MD PhD MSc Irene Litvan MD Eduardo Tolosa MD 《Movement disorders》2011,26(6):1083-1095
During the last decades, atypical parkinsonian disorders such as multiple system atrophy, dementia with Lewy bodies, progressive supranuclear palsy, and corticobasal degeneration along with secondary parkinsonian disorders have been increasingly recognized as important causes of parkinsonism. Although treatment options are largely limited to date, remarkable progress has occurred through advances in the fields of molecular biology and diagnostic neuroimaging, resulting in intense preclinical drug discovery programs. Early‐investigation‐assisted clinical diagnosis has become more crucial than ever because disease‐modifying therapies will hopefully become available within this decade. © 2011 Movement Disorder Society 相似文献
58.
59.
60.