全文获取类型
收费全文 | 1582篇 |
免费 | 73篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 50篇 |
妇产科学 | 9篇 |
基础医学 | 228篇 |
口腔科学 | 33篇 |
临床医学 | 112篇 |
内科学 | 374篇 |
皮肤病学 | 31篇 |
神经病学 | 157篇 |
特种医学 | 17篇 |
外科学 | 171篇 |
综合类 | 4篇 |
预防医学 | 39篇 |
眼科学 | 35篇 |
药学 | 133篇 |
中国医学 | 4篇 |
肿瘤学 | 246篇 |
出版年
2024年 | 2篇 |
2023年 | 12篇 |
2022年 | 14篇 |
2021年 | 30篇 |
2020年 | 18篇 |
2019年 | 22篇 |
2018年 | 33篇 |
2017年 | 24篇 |
2016年 | 33篇 |
2015年 | 30篇 |
2014年 | 33篇 |
2013年 | 53篇 |
2012年 | 81篇 |
2011年 | 113篇 |
2010年 | 52篇 |
2009年 | 43篇 |
2008年 | 94篇 |
2007年 | 110篇 |
2006年 | 110篇 |
2005年 | 112篇 |
2004年 | 114篇 |
2003年 | 121篇 |
2002年 | 105篇 |
2001年 | 19篇 |
2000年 | 17篇 |
1999年 | 25篇 |
1998年 | 27篇 |
1997年 | 16篇 |
1996年 | 21篇 |
1995年 | 18篇 |
1994年 | 14篇 |
1993年 | 17篇 |
1992年 | 9篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 10篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1980年 | 12篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1918年 | 1篇 |
排序方式: 共有1655条查询结果,搜索用时 15 毫秒
1.
2.
Noriyuki Azuma Tetsuo Hida Shinobu Akiya Yasuo Uemura Sinichi Kohsaka Yasuzo Tsukada 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1990,228(1):158-160
Changes in the distribution of hyaluronic acid in the developing human retina were investigated histochemically with alcian
blue staining and theStreptomyces hyaluronidase digestion method using 56 human embryos and fetuses ranging from 5 to 41 weeks of gestational age. Hyaluronic
acid was first detected in the inner layer of the retina at 12 weeks. The site of accumulation extended towards the outer
layer by 20 weeks. At the neonatal stage, longitudinal fibers, possibly the processes of Müller cells, were proved to contain
hyaluronic acid. These findings suggest that Müller cells produce hyaluronic acid transiently from 12 weeks’ gestation to
the neonatal stage. 相似文献
3.
Yasushi NAKAGAWA Shinobu TSUKAMOTO Miho MIYAZAKI Chiyuki NAKAGAWA Takeharu YAMANAKA Norifumi YAMASHITA Akito NOHTOMI 《Psychogeriatrics》2003,3(3):104-108
Background: In Japan a new long‐term care insurance (LTCI) system, the so‐called ‘Kaigo‐Hoken’, was started in April 2000. The present study analyzes the change in the type of destination after discharge from a senile dementia therapy ward before and after the implementation of LTCI at Fukuoka Prefectural Onga Hospital, Japan. Methods: The present study examines data from 199 inpatients discharged from the Fukuoka Prefectural Onga Hospital that had been diagnosed with dementia and met the DSM IV criteria for Alzheimer's type, vascular dementia or other type of dementia. For the purposes of comparison two periods were defined, ‘the first period’ was defined as the period from 1 April 1999 to 31 March 2000, before LTCI was implemented, while ‘the second period’ was defined as the period from 1 April 2000 to 31 March 2001, after LTCI had started. Subject data was analyzed on the basis of where the subject had resided pre‐admission and their destination after discharge using the following classifications: nursing home or geriatric care facility, hospitalization, home and death. Results: While the certification rate of inpatients regarding long‐term care increased slightly in the second period, no significant change was observed based on where the subject had resided pre‐admission and their destination after discharge between the first and second periods. Conclusions: While LTCI is essential for Japan, it is necessary that people with dementia in senile dementia therapy wards are encouraged to return to their homes under the care and support of LTCI. 相似文献
4.
Makoto Watanabe Takashi Fujimoto Masayuki Iwano Hideo Shiiki Shinobu Nakamura 《Nihon Rinshō Men'eki Gakkai kaishi》2002,25(2):191-198
We describe the case of a 61-year-old woman diagnosed with primary Sj?gren's syndrome (SS) after an 8-year history of IgA nephropathy and a 3-year history of recurrent purpuric rashes. Her two daughters had previously been diagnosed with other autoimmune diseases. One daughter had Graves' disease and the other had Hashimoto's disease and systemic lupus erythematosus. The diagnosis of SS was made based on dryness of mucous membranes, Shirmer test, and parotid sialography. Thrombocytopenia, high platelet-aggregated IgG (PA-IgG) level, and normal megakaryocytes count in bone marrow suggested that her recurrent purpuric rashes were due to idiopathic thrombocytopenic purpura (ITP). Patients with SS may develop other autoimmune diseases. This case aids understanding of the immune pathogenesis and genetic background of SS. 相似文献
5.
Hiroyasu Sakai Shinobu Otogoto Yoshihiko Chiba Kazuho Abe Miwa Misawa 《Journal of Smooth Muscle Research》2004,40(1):25-34
While nonspecific airway hyperresponsiveness (AHR) is a central feature of allergic bronchial asthma, the mechanism underlying the development of AHR is not clearly understood. We have previously demonstrated in vitro hyperresponsiveness of bronchial smooth muscle to acetylcholine (ACh) in rats that were actively sensitized and repeatedly challenged with aerosolized antigen. It has also been demonstrated that the ACh-induced, RhoA-mediated Ca(2+) sensitization is markedly augmented concomitantly with an increased expression and activation of RhoA protein in the bronchial smooth muscle of the antigen-treated rats. In the present study, we have investigated whether TNF-alpha, a proinflammatory cytokine which is involved in bronchial asthma, causes upregulation of RhoA mRNA and protein in the rat bronchus. Treatment of rat bronchial smooth muscle preparations with TNF-alpha (300 ng/ml for 24 hr) significantly shifted the concentration-response curve to ACh upwards, but did not alter the response to high K(+), when compared to that of control tissues. Levels of RhoA mRNA and protein in the TNF-alpha-treated bronchus were significantly greater than those in the control group. In conclusion, it is suggested that the augmentation of the ACh-induced contractile response evoked by TNF-alpha might be mediated by an upregulation of RhoA in rat bronchial smooth muscle. 相似文献
6.
Hiroyuki Sakai Masaki Ibe Hidetoshi Takahashi Shinobu Matsuo Kensaku Okamoto Isao Makino Yukio Oomori Hajime Iizuka 《The Journal of dermatology》1996,23(1):42-46
Langerhans cell histiocytosis is currently regarded as a reactive proliferative process of Langerhans cells rather than a malignancy. The disease is characterized by Langerhans cell infiltration of skin, lung, bone and other organs. We report a 74-year-old man with Langerhans cell histiocytosis who had generalized hemorrhagic and crusted papules. He also had diabetes insipidus. Because he did not have any severe constitutional symptoms or failure of vital organs, we applied topical PUVA treatment to his skin lesions, which responded well to the therapy. Diabetes insipidus, however, remained, in spite of X ray radiotherapy for the pituiary lesion. 相似文献
7.
8.
9.
10.
We examined the possibility that lumbar skin warming can increase gastrointestinal motility by investigating the electrogastrogram (EGG), blood pressure, and heart rate with psychometric ratings in healthy humans. Scores of mood state profiles showed that lumbar skin warming (42 degrees C, 20 min) decreased tension-anxiety, depression, anger-hostility, fatigue, and confusion of the participants. A multiple bandpass filter analysis of EGGs showed that a postural transition from orthostatic to supine for measurement caused an increase in dominant frequency of 25-29% towards the frequencies of the normal interdigestive migrating motor complex (IMC). The spectral power of the IMC band, 2.55-3.05 cycles/min, was increased by 20 min-warming, reflecting the increase in gastric contractility. No increase in the spectral power was observed in the time-matched control group without skin warming. Therefore, an increase in contractility is a characteristic of lumbar skin warming. The systolic blood pressure increased by 15% during warm stimulation. Interbeat intervals were not influenced by warm stimulation. An analysis of interbeat intervals by a fast Fourier transform method showed that the cardiac sympathetic and parasympathetic nerves did not play a major role in raising the blood pressure. Vasoconstriction of the mesenteric artery was therefore considered to cause a blood pressure increase during warming. It is hypothesized that vasoconstriction of the visceral arteries by lumbar skin warming increases the blood pressure and gastrointestinal contractility. 相似文献