Infrared spectroscopy characterization of normal and lung cancer cells originated from epithelium     

So Yeong Lee  Kyong-Ah Yoon  Soo Hwa Jang  Erdene Ochir Ganbold  Dembereldorj Uuriintuya  Sang-Mo Shin  Pan Dong Ryu  Sang-Woo Joo 《Journal of veterinary science (Suw?n-si, Korea)》2009,10(4):299-304

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Tobacco cultivars vary in induction of systemic resistance against <Emphasis Type="Italic">Cucumber mosaic virus</Emphasis> and growth promotion by <Emphasis Type="Italic">Pseudomonas chlororaphis</Emphasis> O6 and its <Emphasis Type="Italic">gacS</Emphasis> mutant     

Choong-Min Ryu  Beom Ryong Kang  Song Hee Han  Song Mi Cho  Joseph W. Kloepper  Anne J. Anderson  Young Cheol Kim 《European journal of plant pathology / European Foundation for Plant Pathology》2007,119(4):383-390

The colonization of plant roots with certain rhizosphere bacteria promotes plant growth and induces long lasting systemic protection against a broad spectrum of plant pathogens. The role of the global regulator, GacS, in the rhizosphere colonist Pseudomonas chlororaphis O6 in stimulating growth promotion and induced resistance against Cucumber mosaic virus was examined in tobacco. Responses were compared in tobacco cvs Samsun and GX3. Root colonization of Samsun with wild-type O6 and the gacS complemented mutant-elicited reduced viral symptoms and viral titre. On GX3, there was little affect on symptoms when roots were colonized by the wild-type, gacS mutant or complemented mutant but colonization by both the wild-type and the gacS mutant lowered viral titre. Wild-type O6 and the gacS mutant caused plant growth to be maintained in both tobacco cultivars after viral infection, although the affect was stronger with GX3 than Samsun. In contrast, although a chemical inducer, benzothiadiazole, reduced symptoms and viral titre in both cultivars, plant growth was suppressed. Our results indicate rhizobacteria-elicited induced viral resistance without a negative impact on growth but there was a differential response between cultivars. Detailed knowledge regarding the mechanisms inherent to these differences between cultivars requires further investigation.  相似文献   

Screening Test of Animal Sera for the Cultivation of Leptospires   总被引：1，自引：1，他引：0       下载免费PDF全文

E. Ryu 《Canadian journal of veterinary research》1965,29(3):75-78

The nutritive value of 8 kinds of animal's sera for the growth of Leptospires was studied by a screening method and compared with that of rabbit serum.

The sera of dairy cattle and goats were higher than rabbit serum in average growth number, and thus gave great value for the cultivation of Leptospires.

In eight kinds of animals other than dairy cattle, the growth promoting action of the pooled sera for Leptospires were lower than that of the individual sera of the same kind of animals.

The serum which is to be added to the medium for the cultivation of Leptospires should be tested by a screening test for the absence of growth inhibitory action against Leptospires, no matter from what kind of animal the serum originated.

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Bacteriological and Pathological Studies of Natural and Experimental Swine Abortion Due to Leptospira Pomona          下载免费PDF全文

Fish NA  Ryu E  Hulland TJ 《The Canadian veterinary journal. La revue veterinaire canadienne》1963,4(12):317-326,327

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Carbon balance in the life cycle of wood: targeting a timber check dam     

Chihiro Kayo  Ryu Noda  Takanobu Sasaki  Shinya Takaoku 《Journal of Wood Science》2015,61(1):70-80

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Turbulence and magnetic fields in the large-scale structure of the universe     

Ryu D  Kang H  Cho J  Das S 《Science (New York, N.Y.)》2008,320(5878):909-912

The nature and origin of turbulence and magnetic fields in the intergalactic space are important problems that are yet to be understood. We propose a scenario in which turbulent-flow motions are induced via the cascade of the vorticity generated at cosmological shocks during the formation of the large-scale structure. The turbulence in turn amplifies weak seed magnetic fields of any origin. Supercomputer simulations show that the turbulence is subsonic inside clusters and groups of galaxies, whereas it is transonic or mildly supersonic in filaments. Based on a turbulence dynamo model, we then estimated that the average magnetic field strength would be a few microgauss (microG) inside clusters and groups, approximately 0.1 muG around clusters and groups, and approximately 10 nanogauss in filaments. Our model presents a physical mechanism that transfers the gravitational energy to the turbulence and magnetic field energies in the large-scale structure of the universe.  相似文献   

Requirement of CD9 on the egg plasma membrane for fertilization   总被引：1，自引：0，他引：1  

Miyado K  Yamada G  Yamada S  Hasuwa H  Nakamura Y  Ryu F  Suzuki K  Kosai K  Inoue K  Ogura A  Okabe M  Mekada E 《Science (New York, N.Y.)》2000,287(5451):321-324

CD9 is an integral membrane protein associated with integrins and other membrane proteins. Mice lacking CD9 were produced by homologous recombination. Both male and female CD9-/- mice were born healthy and grew normally. However, the litter size from CD9-/- females was less than 2% of that of the wild type. In vitro fertilization experiments indicated that the cause of this infertility was due to the failure of sperm-egg fusion. When sperm were injected into oocytes with assisted microfertilization techniques, however, the fertilized eggs developed to term. These results indicate that CD9 has a crucial role in sperm-egg fusion.  相似文献   

Innate immune homeostasis by the homeobox gene caudal and commensal-gut mutualism in Drosophila     

Ryu JH  Kim SH  Lee HY  Bai JY  Nam YD  Bae JW  Lee DG  Shin SC  Ha EM  Lee WJ 《Science (New York, N.Y.)》2008,319(5864):777-782

Although commensalism with gut microbiota exists in all metazoans, the host factors that maintain this homeostatic relationship remain largely unknown. We show that the intestinal homeobox gene Caudal regulates the commensal-gut mutualism by repressing nuclear factor kappa B-dependent antimicrobial peptide genes. Inhibition of Caudal expression in flies via RNA interference led to overexpression of antimicrobial peptides, which in turn altered the commensal population within the intestine. In particular, the dominance of one gut microbe, Gluconobacter sp. strain EW707, eventually led to gut cell apoptosis and host mortality. However, restoration of a healthy microbiota community and normal host survival in the Caudal-RNAi flies was achieved by reintroduction of the Caudal gene. These results reveal that a specific genetic deficiency within a host can profoundly influence the gut commensal microbial community and host physiology.  相似文献   

Nonresonant multiple spin echoes     

Brill TM  Ryu S  Gaylor R  Jundt J  Griffin DD  Song YQ  Sen PN  Hürlimann MD 《Science (New York, N.Y.)》2002,297(5580):369-372

Nonresonant manipulation of nuclear spins can probe large volumes of sample situated in inhomogeneous fields outside a magnet, a geometry suitable for mobile sensors for the inspection of roads, buildings, and geological formations. However, the interference by Earth's magnetic field causes rapid decay of the signal within a few milliseconds for protons and is detrimental to this method. Here we describe a technique to suppress the effects of Earth's field by using adiabatic rotations and sudden switching of the applied fields. We observed hundreds of spin echo signals lasting for more than 600 milliseconds and accurately measured the relaxation times of a liquid sample.  相似文献   

Polyhydroxylated alkaloids isolated from mulberry trees (Morusalba L.) and silkworms (Bombyx mori L.)   总被引：2，自引：0，他引：2  

Asano N  Yamashita T  Yasuda K  Ikeda K  Kizu H  Kameda Y  Kato A  Nash RJ  Lee HS  Ryu KS 《Journal of agricultural and food chemistry》2001,49(9):4208-4213

New polyhydroxylated alkaloids, (2R,3R,4R)-2-hydroxymethyl-3,4-dihydroxypyrrolidine-N-propionamide from the root bark of Morus alba L., and 4-O-alpha-D-galactopyranosyl-calystegine B(2) and 3 beta,6 beta-dihydroxynortropane from the fruits, were isolated by column chromatography using a variety of ion-exchange resins. Fifteen other polyhydroxylated alkaloids were also isolated. 1-Deoxynojirimycin, a potent alpha-glucosidase inhibitor, was concentrated 2.7-fold by silkworms feeding on mulberry leaves. Some alkaloids contained in mulberry leaves were potent inhibitors of mammalian digestive glycosidases but not inhibitors of silkworm midgut glycosidases, suggesting that the silkworm has enzymes specially adapted to enable it to feed on mulberry leaves. The possibility of preventing the onset of diabetes and obesity using natural dietary supplements containing 1-deoxynojirimycin and other alpha-glucosidase inhibitors in high concentration is of great potential interest.  相似文献