全文获取类型
收费全文 | 2060篇 |
免费 | 43篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 38篇 |
妇产科学 | 4篇 |
基础医学 | 265篇 |
口腔科学 | 51篇 |
临床医学 | 121篇 |
内科学 | 479篇 |
皮肤病学 | 12篇 |
神经病学 | 263篇 |
特种医学 | 64篇 |
外科学 | 329篇 |
综合类 | 2篇 |
预防医学 | 41篇 |
眼科学 | 18篇 |
药学 | 173篇 |
中国医学 | 10篇 |
肿瘤学 | 230篇 |
出版年
2023年 | 9篇 |
2022年 | 3篇 |
2021年 | 24篇 |
2020年 | 14篇 |
2019年 | 13篇 |
2018年 | 26篇 |
2017年 | 20篇 |
2016年 | 23篇 |
2015年 | 34篇 |
2014年 | 36篇 |
2013年 | 65篇 |
2012年 | 94篇 |
2011年 | 123篇 |
2010年 | 78篇 |
2009年 | 76篇 |
2008年 | 104篇 |
2007年 | 152篇 |
2006年 | 184篇 |
2005年 | 148篇 |
2004年 | 151篇 |
2003年 | 181篇 |
2002年 | 164篇 |
2001年 | 20篇 |
2000年 | 23篇 |
1999年 | 28篇 |
1998年 | 47篇 |
1997年 | 30篇 |
1996年 | 38篇 |
1995年 | 21篇 |
1994年 | 19篇 |
1993年 | 21篇 |
1992年 | 23篇 |
1991年 | 15篇 |
1990年 | 18篇 |
1989年 | 16篇 |
1988年 | 12篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1973年 | 2篇 |
1970年 | 2篇 |
1961年 | 1篇 |
排序方式: 共有2109条查询结果,搜索用时 15 毫秒
1.
Mihoko Hatano Yoshihiro Matsumoto Jun-ichi Fukushi Tomoya Matsunobu Makoto Endo Seiji Okada Kunio Iura Satoshi Kamura Toshifumi Fujiwara Keiichiro Iida Yuko Fujiwara Akira Nabeshima Nobuhiko Yokoyama Suguru Fukushima Yoshinao Oda Yukihide Iwamoto 《Clinical & experimental metastasis》2015,32(6):579-591
2.
3.
4.
Kido J Kido R Suryono Kataoka M Fagerhol MK Nagata T 《Journal of periodontal research》2003,38(6):557-563
OBJECTIVES: Calprotectin is a cytosolic protein with antibacterial action in leukocytes and its level increases in some inflammatory diseases, including periodontal diseases, rheumatoid arthritis and ulcerative colitis. Recently, we found that the lipopolysaccharide of Porphyromonas gingivalis (P-LPS) induced calprotectin release from human neutrophils. P-LPS, a major virulence factor of periodontal pathogens, is known to induce the production and release of inflammatory cytokines through CD14, Toll-like receptor (TLR) and nuclear factor kappaB (NF-kappaB). In the present study, we investigated whether calprotectin release by P-LPS is induced via the CD14-TLR-NF-kappaB pathway and the cellular mechanism of calprotectin release in human neutrophils. MATERIAL AND METHODS: Human neutrophils were isolated from the peripheral blood of healthy donors and pre-incubated in medium containing antibodies against CD14, TLR2 and TLR4, or several inhibitors of NF-kappaB, microtubules and microfilaments, and then incubated with P-LPS. The calprotectin amount in the culture medium was determined using ELISA, and the nuclear extracts from cells were used for the examination of NF-kappaB binding activity using electrophoretic mobility shift assays. RESULTS: P-LPS increased calprotectin release from neutrophils and its induction was inhibited by anti-CD14 and anti-TLR2 antibodies, but not by two anti-TLR4 antibodies. NF-kappaB inhibitors suppressed P-LPS-induced NF-kappaB binding activity and calprotectin release. The inhibitors of microtubule and microfilament polymerization significantly decreased P-LPS-induced calprotectin release. CONCLUSION: These results suggest that calprotectin release is induced by P-LPS via the CD14-TLR2-NF-kappaB signal pathway in human neutrophils and may be dependent on microtubule and microfilament systems. 相似文献
5.
Nifedipine induces gingival epithelial hyperplasia in rats through inhibition of apoptosis 总被引:4,自引:0,他引:4
BACKGROUND: Nifedipine is used as a long-acting vasodilator; one of its side effects is gingival overgrowth, characterized by an accumulation of collagenous components within the gingival connective tissue and epithelial hyperplasia with elongated, branched rete pegs penetrating into the connective tissue. We investigated the effect of nifedipine on apoptosis of gingival keratinocytes of rats to elucidate the mechanism of nifedipine-induced gingival epithelial hyperplasia. METHODS: Twenty-day-old rats were fed a powdered diet containing or lacking nifedipine for 8 to 30 days. The mandibular gingiva and palatal mucosa were removed on days 8, 15, or 30, and epithelial thickness was examined by light microscopy. In situ terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL) assay was used to examine apoptosis of keratinocytes in the epithelium. In addition, we examined the effects of nifedipine on proliferation of keratinocytes and epithelial cell life on day 8 by 5-bromo-2'-deoxyuridine (BrdU) staining. RESULTS: Microscopic examination showed gingival epithelial hyperplasia in nifedipine-treated rats after day 15. Apoptosis of gingival keratinocytes was seen to be inhibited in nifedipine-treated rats on day 8 and 15. Also, nifedipine did not induce an increase of keratinocyte proliferation activity in terms of the number of cells showing positive staining with BrdU. Prolongation of cell life by nifedipine was observed on day 8 in gingival epithelium through a delay of upward cell movement compared to controls. However, epithelial hyperplasia was not detected in palatal mucosa, and there were no significant differences in apoptotic rates of keratinocytes and cell life between nifedipine-treated rats and control rats. CONCLUSIONS: These results suggest that nifedipine induces epithelial hyperplasia in gingival overgrowth not by an increase in keratinocyte proliferation, but by prolongation of cell life through reduction of apoptosis before epithelial hyperplasia is detectable. 相似文献
6.
Kinshi Kato Ken-ichi Otoshi Shoji Yabuki Koji Otani Takuya Nikaido Kazuyuki Watanabe Hiroshi Kobayashi Jun-ichi Handa Shin-ichi Konno 《Fukushima journal of medical science》2021,67(1):49
Abdominal oblique muscle injury is characterized by acute pain and localized tenderness over the lateral trunk. This injury is particularly common among throwing athletes, and usually presents as anterolateral abdominal wall pain. Imaging evidence is scarce in regard to whether oblique muscle injury at its junction with the thoracolumbar fascia can instead present with low back pain. A high school baseball player with unilateral low back pain was referred to us with a different diagnosis. Careful palpation and magnetic resonance imaging guided our care, and the patient returned to high-level competition after 7 weeks of conservative treatment, with no report of recurrence in the subsequent 12 months. Oblique muscle injury at its junction with the thoracolumbar fascia should be added to the differential diagnosis for throwing athletes with unilateral low back pain following a torque movement. 相似文献
7.
Different patterns of cerebellar abnormality and hypomyelination between POLR3A and POLR3B mutations
Jun-ichi Takanashi Hitoshi Osaka Hirotomo Saitsu Masayuki Sasaki Harushi Mori Hidehiro Shibayama Manabu Tanaka Yoshiko Nomura Yasuo Terao Ken Inoue Naomichi Matsumoto A. James Barkovich 《Brain & development》2014
Background
Mutations of POLR3A and POLR3B have been reported to cause several allelic hypomyelinating disorders, including hypomyelination with hypogonadotropic hypogonadism and hypodontia (4H syndrome). Patients and methods: To clarify the difference in MRI between the two genotypes, we reviewed MRI in three patients with POLR3B mutations, and three with POLR3A mutations. Results: Though small cerebellar hemispheres and vermis are common MRI findings with both types of mutations, MRI in patients with POLR3B mutations revealed smaller cerebellar structures, especially vermis, than those in POLR3A mutations. MRI also showed milder hypomyelination in patients with POLR3B mutations than those with POLR3A mutations, which might explain milder clinical manifestations. Conclusions: MRI findings are distinct between patients with POLR3A and 3B mutations, and can provide important clues for the diagnosis, as these patients sometimes have no clinical symptoms suggesting 4H syndrome. 相似文献8.
Marina Hara Hidenobu Matsuzaki Naoki Katase Teruhisa Unetsubo Yoshinobu Yanagi Hitoshi Nagatsuka Jun-ichi Asaumi 《Oral Radiology》2014,30(1):105-110
We previously reported that dynamic contrast-enhanced MRI parameters and time–signal intensity curves (TICs; also known as contrast index curves) are useful for the differential diagnosis of jawbone lesions. In particular, odontogenic fibroma and ossifying fibroma, which possess similar histopathological features (i.e., a mixture of hard and soft tissue components), display unique TIC patterns, and we consider that the TIC patterns of these lesions reflect their hard and soft tissue components. Therefore, fibrous dysplasia, which contains fibrous tissue and immature isolated trabeculae composed of woven bone, is expected to display an interesting TIC. The purpose of this study was to assess the utility of TICs for differentiating between the abovementioned lesions, which have similar histopathological components. 相似文献
9.
Inhibitory Effect of Erythromycin on Superoxide Anion Production by Human Neutrophils Primed with Granulocyte-Colony Stimulating Factor 下载免费PDF全文
10.
Takanashi J Somazawa F Maruyama K Terada H Xu D Barkovich AJ 《Journal of magnetic resonance imaging : JMRI》2012,35(1):174-180