Elastic wave velocities of lunar samples at high pressures and their geophysical implications     

Kanamori H  Nur A  Chung D  Wones D  Simmons G 《Science (New York, N.Y.)》1970,167(3918):726-728

Ultrasonic measurement of P and S velocities of Apollo 11 lunar samples 10020, 10057, and 10065 to 5 kilobars pressure at room temperature shows a pronounced increase of velocity (as much as twofold) for the first 2 kilobars. The travel times predicted from the velocity-depth curve of sample 10057 are consistent with the results of the Apollo 12 seismic experiments. At pressures below 200 bars, the samples are highly attenuating; for both P and S waves, the value of Q is about 10.  相似文献   

Direct patterning of modified oligonucleotides on metals and insulators by dip-pen nanolithography     

Demers LM  Ginger DS  Park SJ  Li Z  Chung SW  Mirkin CA 《Science (New York, N.Y.)》2002,296(5574):1836-1838

The use of direct-write dip-pen nanolithography (DPN) to generate covalently anchored, nanoscale patterns of oligonucleotides on both metallic and insulating substrates is described. Modification of DNA with hexanethiol groups allowed patterning on gold, and oligonucleotides bearing 5'-terminal acrylamide groups could be patterned on derivatized silica. Feature sizes ranging from many micrometers to less than 100 nanometers were achieved, and the resulting patterns exhibited the sequence-specific binding properties of the DNA from which they were composed. The patterns can be used to direct the assembly of individual oligonucleotide-modified particles on a surface, and the deposition of multiple DNA sequences in a single array is demonstrated.  相似文献   

Colonization and degradation of senescent flowers of zucchini squash by Trichoderma harzianum YC459, a biocontrol agent of gray mold, Botrytis cinerea          下载免费PDF全文

Geun Gon Kim　 Young Ryun Chung 《浙江大学学报(农业与生命科学版)》2004,30(4):402-402

In commercial greenhouses, senescent flower petals or flowers of vegetables such as tomato, strawberry, hot pepper and zucchini squash were blighted to be removed from fruits within five days after spraying of Trichoderma harzianum YC459 (TORY, JGreen Inc.), a biocontrol agent with good and consistent efficacy as chemical fungicides for the control of gray mold rot caused by B. cinerea. The mechanism for selective colonization of senescent floral tissues by T. harzianum YC459 was …  相似文献   

Numerical implementation of modified Coulomb-Mohr yield criterion for anisotropic and asymmetric materials     

Myoung-Gyu Lee  Ji Hoon Kim  Hansun Ryou  Kwansoo Chung  Jae Ryoun Youn  Tae Jin Kang 《Fibers and Polymers》2006,7(3):276-285

Development and numerical implementation for an elastoplastic constitutive model for anisotropic and asymmetric materials are presented in this paper. The Coulomb-Mohr yield criterion was modified to consider both the anisotropic and asymmetric properties. The modified yield criterion is an isotropic function of the principal values of a symmetric matrix which is linearly transformed from the Cauchy stress space. In addition to the constitutive equation, the numerical treatment for the singularity in the vertex region of yield surface and stress integration algorithm based on elastoplasticity were presented. In order to assess the accuracy of numerical algorithm, isoerror maps were considered. Also, extension of a strip with a circular hole was simulated and results compared with those obtained using the (smooth) Mises yield criterion to validate stress output for a complex stress state.  相似文献   

Constitutive equations based on cell modeling method for 3D circular braided glass fiber reinforced composites     

Lee  Wonoh  Kim  Ji Hoon  Shin  Heon-Jung  Chung  Kwansoo  Kang  Tae Jin  Youn  Jae Ryoun 《Fibers and Polymers》2003,4(2):77-83

The cell modeling homogenization method to derive the constitutive equation considering the microstructures of the fiber reinforced composites has been previously developed for composites with simple microstructures such as 2D plane composites and 3D rectangular shaped composites. Here, the method has been further extended for 3D circular braided composites, utilizing B-spline curves to properly describe the more complex geometry of 3D braided composites. For verification purposes, the method has been applied for orthotropic elastic properties of the 3D circular braided glass fiber reinforced composite, in particular for the tensile property. Prepregs of the specimen have been fabricated using the 3D braiding machine through RTM (resin transfer molding) with epoxy as a matrix. Experimentally measured uniaxial tensile properties agreed well with predicted values obtained for two volume fractions.  相似文献   

Hypolipidemic and Body Fat–Lowering Effects of Giant Embryo Brown Rice (Seonong 17 and Keunnunjami) in High‐Fat‐Fed Mice     

Soo Im Chung  Catherine W. Rico  Sang Chul Lee  Mi Young Kang 《Cereal Chemistry》2014,91(1):18-22

The effects of giant embryo brown rice Seonong 17 and Keunnunjami, in comparison with that of ordinary normal brown rice, on the body weight and lipid profile in mice under a high‐fat diet condition were investigated. The animals were fed with experimental diets for eight weeks: normal control, high fat (HF), and high fat supplemented with normal brown rice, Seonong 17 rice, or Keunnunjami rice powder. Their body and fat weights, lipid profiles, lipogenic enzyme activities, and adipokine concentrations were determined. Significant differences between the animal groups were analyzed with Tukey's test (P < 0.05). A marked increase in the body weight and fat, plasma triglyceride and total cholesterol concentrations, and free fatty acid level were found in HF mice relative to the control group. On the other hand, diet supplementation with rice, particularly the giant embryo rice samples, significantly suppressed this high‐fat‐induced body weight gain and hyperlipidemia via regulation of lipogenesis and adipokine production. Both the Seonong 17 and Keunnunjami exhibited greater hypolipidemic and body fat–lowering effects than the normal brown rice. The results demonstrate that these giant embryo mutants may be beneficial as biomaterials for functional foods with antiobesity and hypolipidemic effects.  相似文献   

Preparation and characterization of water-soluble chitosan produced by Maillard reaction   总被引：1，自引：0，他引：1  

Ying Chien Chung  Cheng Fang Tsai  Chin Fung Li 《Fisheries Science》2006,72(5):1096-1103

ABSTRACT:   The objective of this research was to improve the solubility of chitosan by Maillard reaction with 1% chitosan and 2% reducing sugar (glucose or glucosamine) dissolved in 0.2 M acetic acid, which was adjusted to pH 6.0, and incubated at either 50°C or 70°C for 1–7 days. The physicochemical and rheological properties of the chitosan–saccharide derivatives were also investigated. Results indicated that the solubility of modified chitosan derivatives was significantly greater than that of native chitosan. The solubility of chitosan–glucosamine was higher than that of chitosan–glucose, and the chitosan–glucosamine derivative remained soluble at pH 10. The degree of deacetylation of the derivatives decreased with increasing reaction time. Rheological investigation revealed that the apparent viscosity of the water-soluble chitosan derivatives in aqueous solution depended upon system conditions such as pH, ionic strength, and solution temperature. The measured apparent viscosity decreased as all system conditions increased. As calculated by the Arrhenius equation, the activation energy ( E _a ) of the derivatives in aqueous solution generally decreased with increasing the extent of Maillard reaction with respect to the reducing sugars used.  相似文献   

Multicentric epitheliotropic T‐cell lymphoma in an African hedgehog (Atelerix albiventris)     

Tae‐Ho Chung  Hyo‐Jin Kim  Ul‐Soo Choi 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2014,43(4):601-604

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Activin stimulates goldfish FSH biosynthesis by enhancing FSHβ promoter activity     

Wei Ge  Nga-Ling Ko  Flora Yee-Man Pang  Me-Fong Chung  Sze-Wah Lin  Chi-Wai Yuen  Man-Tat Lau  Lin Liu  Young Chang Sohn  Makito Kobayashi  Katsumi Aida 《Fish physiology and biochemistry》2003,28(1-4):65-71

Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) play critical roles in controlling vertebrate gonadal development and function. Activin, a dimeric growth factor initially identified in the gonads, is important in the differential regulation of the two gonadotropins in mammals. Using goldfish as a model, we have demonstrated that activin stimulates FSHβ but suppresses LHβ expression. The present study demonstrated that the 5′-flanking region of goldfish FSHβ gene is functional in the mouse gonadotrope cell line, LβT2 cells. Similar to its effect on the cultured pituitary cells, activin stimulated FSHβ promoter activity in the LβT2 cells and the effect could be blocked by its binding protein follistatin. Follistatin also significantly suppressed the basal FSHβ promoter activity, suggesting secretion of endogenous activin by the LβT2 cells. Further characterization of the cis-regulatory elements responsible for activin stimulation is now under way in our laboratory.  相似文献   

SSR marker tightly linked to the Ti locus in Soybean [Glycine max (L.) Merr.]     

Myung Sik Kim  Min Jung Park  Woo Hyeun Jeong  Ki Chul Nam  Jong Il Chung 《Euphytica》2006,152(3):361-366

Soybean is a major source of protein meal in the world. Soybean kunitz trypsin inhibitor (SKTI) protein is a responsible for the inferior nutritional quality of unheated or incompletely heated soybean meal. The primary objective of this research was to identify DNA markers linked to the Ti locus controlling presence and absence of kunitz trypsin inhibitor protein. Two mapping populations were developed. Population 1 was derived from a cross between cultivar Jinpumkong2 (TiTi) and C242 (titi). Population 2 was made from a mating between cultivar Clark (TiTi) and C242. The F₁ plants were grown in the greenhouse to produce F₂ seeds. Each F₂ seed from F₁ plants was analyzed electrophoretically to determine the presence of the SKTI protein band. One-thousand RAPD primers, 342 AFLP primer sets, and 35 SSR primers were used to map Ti locus in population 1 and 2. The presence of SKTI protein was dominant to the lack of a SKTI protein and kunitz trypsin inhibit protein band was controlled by a single locus. Twelve DNA markers (4 RAPD, 4 AFLP, and 3 SSR) and Ti locus were found to be genetically linked in population 1 consisted with 94 F₂ individual plants. Three SSR markers (Satt409, Satt228, and Satt429) were linked with Ti locus within 10 cM. Satt228 marker was tightly linked with Ti locus. Satt228 marker was tightly linked within 0–3.7 cM of the Ti locus and may be useful in a marker assisted selection program.  相似文献