全文获取类型
收费全文 | 258篇 |
免费 | 22篇 |
出版年
2022年 | 3篇 |
2021年 | 13篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 21篇 |
2014年 | 18篇 |
2013年 | 21篇 |
2012年 | 25篇 |
2011年 | 14篇 |
2010年 | 18篇 |
2009年 | 10篇 |
2008年 | 12篇 |
2007年 | 18篇 |
2006年 | 15篇 |
2005年 | 5篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 9篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1986年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有280条查询结果,搜索用时 140 毫秒
41.
Seulah Lee Dahae Lee Joo Chan Lee Ki Sung Kang Rhim Ryoo Hyun‐Ju Park Ki Hyun Kim 《化学与生物多样性》2018,15(9)
Calvatia species, generally known as puffball mushrooms, are used both as sources of food and as traditional medicine. Among the Calvatia genus, Calvatia nipponica (Agaricaceae) is one of the rarest species. Using bioassay‐guided fractionation based on anti‐inflammatory effects, five alkaloids ( 1 – 5 ), two phenolics ( 6 and 7 ), and a fatty acid methyl ester ( 8 ) were isolated from the fruiting bodies of C. nipponica. Compound 8 was identified from C. nipponica for the first time, and all isolates ( 1 – 8 ) were tested for inhibition of nitric oxide (NO) production in lipopolysaccharide (LPS)‐stimulated RAW264.7 macrophages. Compound 7 showed mild inhibition while compound 8 significantly inhibited NO production with an IC50 value of 27.50 ± 0.08 μm . The mechanism of NO inhibition of compound 7 was simulated by molecular docking analysis against nitric oxide synthase (iNOS), which revealed the interactions of 7 with the key amino acid residue and the heme in the active site. With the most potent inhibition against LPS‐induced inflammation, compound 8 was further investigated with respect to its mechanism of action, and the activity was found to be mediated through the inhibition of iNOS and COX‐2 expression. 相似文献
42.
43.
Hye-Rim Shin Rabia Islam Won-Joon Yoon Taegyung Lee Young-Dan Cho Han-sol Bae Bong-Su Kim Kyung-Mi Woo Jeong-Hwa Baek Hyun-Mo Ryoo 《The Journal of biological chemistry》2016,291(11):5555-5565
The canonical Wnt signaling pathway, in which β-catenin nuclear localization is a crucial step, plays an important role in osteoblast differentiation. Pin1, a prolyl isomerase, is also known as a key enzyme in osteogenesis. However, the role of Pin1 in canonical Wnt signal-induced osteoblast differentiation is poorly understood. We found that Pin1 deficiency caused osteopenia and reduction of β-catenin in bone lining cells. Similarly, Pin1 knockdown or treatment with Pin1 inhibitors strongly decreased the nuclear β-catenin level, TOP flash activity, and expression of bone marker genes induced by canonical Wnt activation and vice versa in Pin1 overexpression. Pin1 interacts directly with and isomerizes β-catenin in the nucleus. The isomerized β-catenin could not bind to nuclear adenomatous polyposis coli, which drives β-catenin out of the nucleus for proteasomal degradation, which consequently increases the retention of β-catenin in the nucleus and might explain the decrease of β-catenin ubiquitination. These results indicate that Pin1 could be a critical target to modulate β-catenin-mediated osteogenesis. 相似文献
44.
Je-Yong Choi Byung-Heon Lee Keun-Bae Song Rang-Woon Park In-San Kim Kun-Young Sohn Joon-Seung Jo Hyun-Mo Ryoo 《Journal of cellular biochemistry》1996,61(4):609-618
Bone formation involves several tightly regulated gene expression patterns of bone-related proteins. To determine the expression patterns of bone-related proteins during the MC3T3-E1 osteoblast-like cell differentiation, we used Northern blotting, enzymatic assay, and histochemistry. We found that the expression patterns of bone-related proteins were regulated in a temporal manner during the successive developmental stages including proliferation (days 4–10), bone matrix formation/maturation (days 10–16), and mineralization stages (days 16 –30). During the proliferation period (days 4–10), the expression of cell-cycle related genes such as histone H3 and H4, and ribosomal protein S6 was high. During the bone matrix formation/maturation period (days 10–16), type I collagen expression and biosynthesis, fibronectin, TGF-β1 and osteonectin expressions were high and maximal around day 16. During this maturation period, we found that the expression patterns of bone matrix proteins were two types: one is the expression pattern of type I collagen and TGF-β1, which was higher in the maturation period than that in both the proliferation and mineralization periods. The other is the expression pattern of fibronectin and osteonectin, which was higher in the maturation and mineralization periods than in the proliferation period. Alkaline phosphatase activity was high during the early matrix formation/maturation period (day 10) and was followed by a decrease to a level still significantly above the baseline level seen at day 4. During the mineralization period (days 16–30), the number of nodules and the expression of osteocalcin were high. Osteocalcin gene expression was increased up to 28 days. Our results show that the expression patterns of bone-related proteins are temporally regulated during the MC3T3-E1 cell differentiation and their regulations are unique compared with other systems. Thus, this cell line provides a useful in vitro system to study the developmental regulation of bone-related proteins in relation to the different stages during the osteoblast differentiation. © 1996 Wiley-Liss, Inc. 相似文献
45.
Seungwan Ryoo Bong-Kwang Jung Taehee Chang Sooji Hong Hyejoo Shin Jong-Yil Chai 《The Korean journal of parasitology》2021,59(4):341
Acanthoparyphium shinanense n. sp. (Digenea: Echinostomatidae) is described from chicks experimentally infected with the metacercariae encysted in 2 brackish water clam species, Ruditapes philippinarum and Coecella chinensis, in the Republic of Korea. The metacercariae were round to oval, armed with 23 collar spines, and 0.216 (0.203–0.226) mm in diameter. From 5 chicks experimentally infected each with 200 metacercariae, 34 juvenile (5-day-old worms) and 104 adult flukes (7-day-old worms) were harvested from their small intestines, with the average worm recovery rate of 13.8%. The adult flukes were 3.18 (2.89–3.55) mm long and 0.68 (0.61–0.85) mm wide, with an elongated, posteriorly tapering body, and a prominent head collar armed with 23 collar spines arranged in a single uninterrupted row. The posterior testis of A. shinanense was longitudinally elongated, which is similar to Acanthoparyphium spinulosum Johnston, 1917 but unique from the other closely related species, including Acanthoparyphium tyosenense Yamaguti, 1939, Acanthoparyphium kurogamo Yamaguti, 1939, and Acanthoparyphium marilae Yamaguti, 1934. The eggs of A. shinanense were larger than those of A. spinulosum, and the anterior extent of 2 lateral groups of vitellaria was slightly more limited in A. shinanense than in A. spinulosum. Molecular analysis of nuclear and mitochondrial genes revealed low homology with A. spinulosum from USA (96.1% in 5.8S rRNA) and Ukraine (97.9% in 28S rRNA), Acanthoparyphium n. sp. from USA (98.0% in 28S rRNA), and Acanthoparyphium sp. from Australia, Kuwait, and New Zealand. Biological characteristics, including its first intermediate host and natural definitive hosts, as well as its zoonotic capability, should be elucidated. 相似文献
46.
Kang‐Young Choi Hyun‐Jung Kim Byung‐Chae Cho In‐San Kim Hyun‐Jung Kim Hyun‐Mo Ryoo 《Journal of cellular biochemistry》2009,107(4):818-825
TGF‐β3, TβR‐I, and TGF‐β‐activated Smad2 has been suggested to be a series of signaling molecules for secondary palate fusion. In this article, we show that a gene induced by TGF‐β, βig‐h3, is coincidentally expressed with TGF‐β3 in medial edge epithelial (MEE) cells undergoing apoptosis during normal palatal fusion. βig‐h3 was also highly expressed in the areas of post‐weaning mammary gland cells and developing phalangeal joints in which TGF‐β3 or BMP‐4‐induced apoptosis occurs, respectively. Blocking of βig‐h3 expression in E12.5 embryos with antisense oligodeoxynucleotides (ODN) resulted in cleft of the secondary palate in 84% of the treated mice that were born. Moreover, the antisense ODN treatment resulted in a failure of apoptosis in the MEE between palatal shelves in physical contact in organ culture. We conclude that βig‐h3 expression in the MEE is stimulated by TGF‐β3, causes cell death, and consequently results in complete fusion of the apposed palatal shelves. J. Cell. Biochem. 107: 818–825, 2009. © 2009 Wiley‐Liss, Inc. 相似文献
47.
Philippe Noriel Q. Pascua Min-Suk Song Jun Han Lee Kuk Jin Park Hyeok-il Kwon Yun Hee Baek Seung-Pyo Hong Jong-Bok Rho Chul-Joong Kim Haryoung Poo Thomas S. Ryoo Moon-Hee Sung Young Ki Choi 《PloS one》2009,4(12)
The current pandemic (H1N1) 2009 virus remains transmissible among humans worldwide with cases of reverse zoonosis, providing opportunities to produce more pathogenic variants which could pose greater human health concerns. To investigate whether recent seasonal human or swine H1N1 vaccines could induce cross-reactive immune responses against infection with the pandemic (H1N1) 2009 virus, mice, ferrets or mini-pigs were administered with various regimens (once or twice) and antigen content (1.77, 3.5 or 7.5 µg HA) of a-Brsibane/59/07, a-CAN01/04 or RgCA/04/09xPR8 vaccine. Receipt of a-CAN01/04 (2-doses) but not a-Brisbane/59/07 induced detectable but modest (20–40 units) cross-reactive serum antibody against CA/04/09 by hemagglutinin inhibition (HI) assays in mice. Only double administration (7.5 µg HA) of both vaccine in ferrets could elicit cross-reactivity (30–60 HI titers). Similar antigen content of a-CAN01/04 in mini-pigs also caused a modest ∼30 HI titers (twice vaccinated). However, vaccine-induced antibody titers could not suppress active virus replication in the lungs (mice) or virus shedding (ferrets and pigs) of immunized hosts intranasally challenged with CA/04/09. Furthermore, neither ferrets nor swine could abrogate aerosol transmission of the virus into naïve contact animals. Altogether, these results suggest that neither recent human nor animal H1N1 vaccine could provide complete protectivity in all animal models. Thus, this study warrants the need for strain-specific vaccines that could yield the optimal protection desired for humans and/or animals. 相似文献
48.
Ji-Chan Jang Yong-Gyun Jung Jungil Choi Hyunju Jung Sungweon Ryoo 《Journal of microbiology (Seoul, Korea)》2017,55(6):483-487
This study aimed to provide information that bedaquilline is significantly effective for treatment of totally drug resistant (TDR) Mycobacterium tuberculosis that shows resistant to all first- and second-line drugs-using an innovative disc agarose channel (DAC) system. Time-lapse images of single bacterial cells under culture conditions with different concentrations of bedaquiline were analysed by image processing software to determine minimum inhibitory concentrations (MICs). Bedaquiline inhibited the growth of TDR M. tuberculosis strains, with MIC values ranging from 0.125 to 0.5 mg/L. The results of the present study demonstrate that bedaquiline, newly approved by the United States Food and Drug Administration (FDA), may offer therapeutic solutions for TDR-TB. 相似文献
49.
50.