Isolation of avian pneumovirus from an outbreak of respiratory illness in Minnesota turkeys.     

S M Goyal  S J Chiang  A M Dar  K V Nagaraja  D P Shaw  D A Halvorson  V Kapur 《Journal of veterinary diagnostic investigation》2000,12(2):166-168

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Microscopic Particle Motions in Strongly Coupled Dusty Plasmas     

L I  WT Juan  CH Chiang  JH Chu 《Science (New York, N.Y.)》1996,272(5268):1626-1628

The microscopic particle motions from the crystal to the disordered state of a dusty plasma with micrometer-sized silicon dioxide particle suspensions in a radio-frequency glow discharge system were studied through an optical microimaging system. Small-amplitude random motion around the lattice sites of the crystal state, relative domain motion with varying boundaries, cooperative hopping in the liquid state, and highly disordered motion with increasing radio-frequency power were observed. Chaotic states with different spatial scales under the coherent and stochastic coupling between dust particles and self-organized background plasma fluctuations were also demonstrated.  相似文献   

Quantum-well states as fabry-Perot modes in a thin-film electron interferometer     

Paggel JJ  Miller T  Chiang T 《Science (New York, N.Y.)》1999,283(5408):1709-1711

Angle-resolved photoemission from atomically uniform silver films on iron (100) shows quantum-well states for absolutely determined film thicknesses ranging from 1 to approximately 100 monolayers. These states can be understood in terms of Fabry-Perot modes in an electron interferometer. A quantitative line shape analysis over the entire two orders of magnitude of thickness range yields an accurate measurement of the band structure, quasiparticle lifetime, electron reflectivity, and phase shift. Effects of confinement energy gap, reflection loss, and surface scattering caused by controlled roughness are demonstrated.  相似文献   

Integrins regulate Rac targeting by internalization of membrane domains     

del Pozo MA  Alderson NB  Kiosses WB  Chiang HH  Anderson RG  Schwartz MA 《Science (New York, N.Y.)》2004,303(5659):839-842

Translocation of the small GTP-binding protein Rac1 to the cell plasma membrane is essential for activating downstream effectors and requires integrin-mediated adhesion of cells to extracellular matrix. We report that active Rac1 binds preferentially to low-density, cholesterol-rich membranes, and specificity is determined at least in part by membrane lipids. Cell detachment triggered internalization of plasma membrane cholesterol and lipid raft markers. Preventing internalization maintained Rac1 membrane targeting and effector activation in nonadherent cells. Regulation of lipid rafts by integrin signals may regulate the location of membrane domains such as lipid rafts and thereby control domain-specific signaling events in anchorage-dependent cells.  相似文献   

Possible Evidence for Superconducting Layers in Single Crystal YBa2Cu3O7-x by Field Ion Microscopy     

Melmed AJ  Shull RD  Chiang CK  Fowler HA 《Science (New York, N.Y.)》1988,239(4836):176-178

The high-transition-temperature superconducting ceramic material YBa(2)Cu(3)O(7-x) (0< x < 0.5) has been examined by field ion microscopy. Specimens from nominally superconducting and nonsuperconducting samples(determined by magnetic susceptibility measurements) were studied by field ion microscopy and significant differences were found. Preferential imaging of atomic or molecular layers, due to preferential field evaporation, field ionization, or both, was found in the superconducting phase below the transition temperature and is interpreted as possible evidence for the occurrence of relatively highly conducting layers in the YBa(2)Cu(3)O(7-x) unit cell perpendicular to the orthorhombic c-axis. Similar results were obtained for YbBa(2)Cu(3)(7-x).  相似文献   

Enols and other reactive species     

Chiang Y  Kresge AJ 《Science (New York, N.Y.)》1991,253(5018):395-400

Rapid advances in the chemistry of enols and other reactive species have been made possible recently by the development of methods for generating these short-lived substances in solution under conditions where they can be observed directly and their reactions can be monitored accurately. New laboratory techniques are described and a sample of the new chemistry they have made available is provided; special attention is given to ynols and ynamines and the remarkable effects that the carbon-carbon triple bonds of these substances have on their acid-base properties.  相似文献   

A New Method for Rearing Drosophila     

Hodson AC  Chiang HC 《Science (New York, N.Y.)》1948,107(2772):176-177

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Inheritance of head splitting in cabbage (Brassica oleracea L. var. capitata L.)     

M. S. Chiang 《Euphytica》1972,21(3):507-509

Summary The inheritance of head splitting was probed by studying two moderate inbred lines of early-splitting and late-splitting cabbages, their F₁, F₂ and backcross progenies under field condition. It was concluded that there were at least 3 gene pairs for controlling head splitting. Gene action was mostly additive but partial dominance for early splitting was detected. Narrow sense heritability was estimated as 47%.  相似文献   

Transfer of resistance to race 2 of Plasmodiophora brassicae from Brassica napus to cabbage (B. Oleracea ssp. capitata). V. The inheritance of resistance     

M. S. Chiang  R. Crête 《Euphytica》1983,32(2):479-483

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The somatic karyotype of cabbage (Brassica oleracea ssp. capitata)     

B. Y. Chiang  W. F. Grant  M. S. Chiang 《Euphytica》1979,28(1):41-45

Summary The individual chromosomes of cabbage are identifiable in nucellar cells found in the ovaries of immature pistils by the combination of their relative length, arm ratios, secondary constrictions, chromatic and achromatic regions and the presence of satellites.  相似文献