全文获取类型
收费全文 | 262篇 |
免费 | 17篇 |
出版年
2024年 | 1篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 16篇 |
2013年 | 19篇 |
2012年 | 19篇 |
2011年 | 18篇 |
2010年 | 15篇 |
2009年 | 10篇 |
2008年 | 20篇 |
2007年 | 20篇 |
2006年 | 19篇 |
2005年 | 10篇 |
2004年 | 15篇 |
2003年 | 10篇 |
2002年 | 14篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 9篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 6篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有279条查询结果,搜索用时 156 毫秒
271.
Shunsuke Oba Kazuto Washida Yu Shimada Tadahiro Sunagawa Reiko Tanihiro Hiroshi Sugiyama 《Bioscience, biotechnology, and biochemistry》2020,84(10):2174-2178
ABSTRACT Yeast mannan is a part of yeast cell wall and can potentially affect gut microflora as a soluble dietary fiber. We demonstrated that yeast mannan suppressed putrefactive production and increased the relative abundance of Bacteroides thetaiotaomicron in in vitro fecal fermentation. These results suggest that yeast mannan can be used as a novel prebiotic food ingredient. 相似文献
272.
Hiroaki Kiyohara Taichi Uchida Manami Takakiwa Toshiake Matsuzaki Noriyasu Hada Tadahiro Takeda Toshiro Shibata Haruki Yamada 《Phytochemistry》2010,71(2-3):280-293
Thirteen polysaccharides isolated from an extract of the aerial portions of Astragalus mongholics Bunge demonstrated immunomodulating activity against Peyer’s patch immunocompetent cells. Nine of the active polysaccharide fractions were composed of either arabinogalactans, pectic arabinogalactans or pectins. The activities of the arabinogalactans and pectic arabinogalactans were associated with β-d-(1 → 3)-galactan moieties branched with β-d-(1 → 6)-galactooligosaccharide side-chains having degrees of polymerization of 8 or less. Degradation of the β-d-(1 → 3)-galactan or β-d-(1 → 6)-galactosyl side-chains in the arabinogalactans significantly decreased immunomodulating activity. Rhamnogalacturonan I (RG-I) with β-d-(1 → 3,6)-galactosyl side-chains having terminal β-d-GlcA showed activity in the pectin-enriched fractions. Interestingly, the terminal GlcA was not required for activity of the arabinogalactan-enriched fractions, suggesting at least two different immunomodulating structures. 相似文献
273.
In connection with a program directed toward the biogenetic-type synthesis of bromine-containing terpenoids, we have developed a new reagent system which provides for selective brominative cyclization of polyenes. The mechanism of Br+-formation in nature is discussed on the basis of the new reagent system. 相似文献
274.
Tadahiro Suzuki Young-Kyung Kim Hifumi Yoshioka Yumiko Iwahashi 《Mycotoxin Research》2013,29(2):103-111
The metabolic products resulting from the cultivation of F. asiaticum in agmatine were identified using capillary electrophoresis–time of flight mass spectrometry. Glyoxylic acid was detected from fungal cultures grown in agmatine, while it was absent in control cells. The abundance of other metabolic products of the glycolytic pathway also increased because of agmatine; however, there was no increase in the amounts of pyruvic acid or metabolites from the tricarboxylic acid cycle. Moreover, gene expression levels within Fusarium asiaticum exposed to agmatine were analyzed by DNA microarray. Changes in gene expression levels directed the changes in metabolic products. Our results suggest that acetyl coenzyme A, which is a starting substrate for the biosynthesis of deoxynivalenol (DON), was simultaneously produced by activated β-oxidation. Furthermore, the content of 4-aminobutyrate (GABA) was increased in the agmatine addition culture medium. GABA can be synthesized from agmatine through putrescine and might influence the regulation of DON-related genes. 相似文献
275.
Tadahiro Kato Masaki Kobayashi Nobuki Sasaki Yoshio Kitahara Norindo Takahashi 《Phytochemistry》1978,17(1):158-159
By the aid of germination assay with lettuce seeds, the germination inhibitors in the parsley seeds were investigated. One of the inhibitors was revealed to be heraclenol. 相似文献
276.
Background
Circadian clocks are internal daily time keeping mechanisms that allow organisms to anticipate daily changes in their environment and to organize their behavior and physiology in a coherent schedule. Although circadian clocks use temperature compensation mechanisms to maintain the same pace over a range of temperatures, they are also capable of synchronizing to daily temperature cycles. This study identifies key properties of this process. 相似文献277.
The fact that Nocardia amarae YK1 produced a bacterial flocculation-inducing substance (designated as FIX) was discovered. FIX had a function of flocculating proliferous cells. FIX-induced flocculation was inhibited by making cells resting, but not completely by adding chloramphenicol. FIX worked widely on Gram-positive to -negative bacteria. In the presence of FIX, Achromobacter cycloclastus IAM1013, Acinetobacter calcoaceticus IAM1517, Bacillus subtilis IAM1069, Escherichia coli C600-1, E. coli IAM1239, Flavobacterium lutescens IAM1667, Klebsiella pneumoniae IAM1102, Micrococcus luteus IAM1313 and Pseudomonas putida IAM1002 formed flocs. B. cereus IAM1029, however, exhibited no flocculation. 相似文献
278.
279.