全文获取类型
收费全文 | 16826篇 |
免费 | 767篇 |
国内免费 | 137篇 |
专业分类
耳鼻咽喉 | 169篇 |
儿科学 | 360篇 |
妇产科学 | 123篇 |
基础医学 | 2139篇 |
口腔科学 | 303篇 |
临床医学 | 1072篇 |
内科学 | 4486篇 |
皮肤病学 | 445篇 |
神经病学 | 1399篇 |
特种医学 | 535篇 |
外科学 | 2690篇 |
综合类 | 46篇 |
一般理论 | 4篇 |
预防医学 | 361篇 |
眼科学 | 618篇 |
药学 | 1120篇 |
中国医学 | 28篇 |
肿瘤学 | 1832篇 |
出版年
2023年 | 94篇 |
2022年 | 175篇 |
2021年 | 444篇 |
2020年 | 215篇 |
2019年 | 274篇 |
2018年 | 346篇 |
2017年 | 274篇 |
2016年 | 368篇 |
2015年 | 412篇 |
2014年 | 500篇 |
2013年 | 610篇 |
2012年 | 1088篇 |
2011年 | 1149篇 |
2010年 | 683篇 |
2009年 | 575篇 |
2008年 | 1001篇 |
2007年 | 1143篇 |
2006年 | 1068篇 |
2005年 | 1217篇 |
2004年 | 1196篇 |
2003年 | 1058篇 |
2002年 | 1099篇 |
2001年 | 189篇 |
2000年 | 137篇 |
1999年 | 222篇 |
1998年 | 286篇 |
1997年 | 209篇 |
1996年 | 215篇 |
1995年 | 187篇 |
1994年 | 160篇 |
1993年 | 171篇 |
1992年 | 101篇 |
1991年 | 88篇 |
1990年 | 92篇 |
1989年 | 82篇 |
1988年 | 58篇 |
1987年 | 42篇 |
1986年 | 43篇 |
1985年 | 41篇 |
1984年 | 44篇 |
1983年 | 36篇 |
1982年 | 42篇 |
1981年 | 40篇 |
1980年 | 32篇 |
1979年 | 31篇 |
1978年 | 36篇 |
1977年 | 26篇 |
1976年 | 13篇 |
1975年 | 11篇 |
1974年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
Yuka Sakazume Makoto Tanaka Itsuo Isobe Rika Tominaga Eiji Nanba Koichi Okamoto 《Clinical neurology》2004,44(8):541-544
We reported a patient with middle-aged onset sialidosis type I. A 52-year-old Japanese man was referred to our hospital because of dysarthria, involuntary movement of his extremities and gait disturbance since the age of 46 years. On admission, neurological examination revealed scanning speech, action myoclonus, cerebellar ataxia and cherry-red spots. Vacuolated lymphocytes were found in peripheral blood. Brain 18F-2-fluoro-2-deoxy-D-glucose positron emission tomography (18F-FDG PET) showed decreased glucose metabolism in the cerebellum. Enzymological analysis using his skin fibroblasts revealed primary deficiency of sialidase activity. Sialidase gene analysis identified compound heterozygotes for base substitusions of 239T-to-C and 649G-to-A, which resulted in amino acid alterations of P80L and V217M, respectively. These mutations have been reported in Japanese sialidosis type II (P80L) and I (V217M). Further studies are required to reveal effects of gene mutations on residual enzyme activities and phenotypes. 相似文献
42.
43.
44.
Newborn infant with maternal anti-SSA antibody-induced complete heart block accompanying cardiomyopathy. 总被引:2,自引:0,他引:2
Newborn case of maternal anti-SSA antibody-induced congenital complete heart block (CCHB) accompanying cardiomyopathy is presented. Unexpectedly, she died of ventricular tachycardia, not bradycardia, 6 days after birth. Autopsy revealed left ventricular cardiomyopathy with endocardial fibroelastosis. Thus, when evaluating fetal cardiac performance in cases of maternal anti-SSA antibody-induced CCHB, it is necessary to pay attention to myocardial attributes such as endocardial hyperplasia. 相似文献
45.
The threshold beta-ray energy for Cerenkov photon production can be reduced to about 0.07 MeV by using a transparent ceramic with a high refractive index. This makes it possible to measure the low-energy beta-emitters 14C and 45Ca by Cerenkov counting with efficiencies of 1.5% and 2.3%, respectively. 相似文献
46.
Health-related quality of life among persons living in Japan with a permanent colostomy. 总被引:2,自引:0,他引:2
Naomi Ito Makoto Tanaka Keiko Kazuma 《Journal of wound, ostomy, and continence nursing》2005,32(3):178-83; quiz 184-5
OBJECTIVE: To compare the health-related quality of life (HRQOL) of persons with a permanent colostomy to that of the general Japanese population and explore the factors influencing HRQOL. DESIGN: A cross-sectional survey. SETTING AND SUBJECTS: A total of 255 persons with an ostomy who attended a meeting of the Japan Ostomy Association in the Kanto region of Japan. INSTRUMENTS: The HRQOL was assessed using Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), Japanese version 1.2. Factors potentially influencing the HRQOL were age, sex, marital status, employment status, number of people in the household, time since colostomy, and diagnosis. METHODS: Questionnaires were distributed to the subjects and SF-36 scores were determined and compared with the corresponding national-norm data by Wilcoxon signed rank sum test. A logistic regression analysis was used to explore the influencing factors. RESULTS: The questionnaire response rate was 66.7%. Subjects with a urostomy or an ileostomy and those with missing data were excluded. Data from 102 subjects with a permanent colostomy were analyzed. The subjects' scores were significantly lower than the national-norm scores in the role-physical and social functioning scales. Being employed was associated with significantly lower scores or associated with a tendency toward lower scores. CONCLUSIONS: Scores in two scales in these subjects were lower than those of national-norm scores. Being employed had a negative impact on the HRQOL of subjects with a permanent colostomy. The results of this study provide reference data for future research and underscore the importance of support for persons with a colostomy. 相似文献
47.
Heat Flow and Distribution during Epidural Anesthesia 总被引:43,自引:0,他引:43
48.
We investigated anticardiolipin antibodies (aCL) by enzyme linked immunosorbent assay with adding aCL-cofactor in two cases of recurrent OPN and ATM patients. These two patients had similar clinical features with ATM and OPN during their clinical courses. They were supposed to be suffered with multiple sclerosis (MS), although cranial MRI was normal and oligoclonal IgG band (OCB) was consistently absent in the cerebrospinal fluid. Positive aCL is suggestive that this disease may be a disorder associated with aCL with different etiology and pathogenesis from other MS patients. Serologic testing for aCL with aCL-cofactor should be warranted for MS patients, especially for those showing OPN and ATM during the clinical course, because in orientals the incidence of ATM and OPN is relatively high among MS. 相似文献
49.
Yohei Ogawa Makoto Hiura Toru Kikuchi Keisuke Nagasaki Yukie Iwata Makoto Uchiyama 《Clinical Pediatric Endocrinology》2004,13(1):55-58
This study aimed to investigate the levels of serum low-density lipoprotein
cholesterol (LDLC) using direct measurement in healthy Japanese school children. The
subjects were 621 children (325 boys and 296 girls) aged 9 to 10 in the 4th grade, and 688
children (334 boys and 354 girls) aged 12 to 13 in the 7th grade. The levels of serum LDLC
and high-density lipoprotein cholesterol were measured by direct determination (Cholestest
LDL and Cholestest NHDL; Daiichi Pure Chemicals Co., Ltd., Tokyo, Japan). In boys in the
4th grade, the mean, the 75th, the 90th and the 95th percentiles of LDLC levels (mg/dl)
were 91.6, 104, 124 and 134, respectively. In girls in the 4th grade, they were 92.8, 108,
122 and 130. In boys in the 7th grade, they were 83.4, 96, 113 and 123. In girls in the
7th grade, they were 93.0, 106, 126 and 137. Serum LDLC levels in boys in the 7th grade
were lower than those of other groups. The direct measurement of serum LDLC level is
useful for evaluation of dyslipidemia in healthy school children, because the method is
applicable to non-fasting serum. 相似文献
50.
Tadashi Nomura MD ; Hiroto Terashi MD PhD ; Makoto Omori MD ; Atsushi Sakurai MD ; Takeru Sunagawa PhD ; Masumi Hasegawa MS ; Shinya Tahara MD PhD 《Wound repair and regeneration》2007,15(6):833-837
Hypertrophic scars (HS) are a consequence of abnormal wound healing. We examined fatty acids that are contained within, and participate in, every reaction through the membrane; then, we analyzed the percentage composition of the fatty acids in deepithelialized normal dermis (ND) and HS. In vivo HS samples were obtained from six patients undergoing surgical excision, and ND samples from five patients undergoing skin grafting surgery for excess. In vitro, cultured fibroblasts from HS and ND were also analyzed. The percentage composition of fatty acids extracted from all the samples was analyzed. In vivo, arachidonic acid (20:4) was significantly more abundant in HS than in ND, in the phospholipids from both whole tissue and cell membranes. In vitro, there were no significant differences among ND, HS, and 10% fetal calf serum. The results suggest that HS formation does not necessarily involve simple excess of 20:4; however, there are considerable differences in the percentage composition of 20:4 between ND and HS. Arachidonic acid probably participates in the formation and maintenance of HS, whereas in vitro cultured fibroblasts are affected largely by fetal calf serum. 相似文献