Traumatic rupture of the urinary bladder in a horse     

C. BECK  AJ DART  SA McCLINTOCK  DR HODGSON 《Australian veterinary journal》1996,73(4):154-155

  相似文献   

人工林UHF频段电波传播场强预测模型   总被引：1，自引：0，他引：1  

李文彬  张俊梅  撒潮  王德明  高凯 《北京林业大学学报》2007,29(4):15-18

人工林无线电波传播场强模型是合理设计人工林环境无线电遥测遥控等通信电路的理论依据.该文在分析无线电波传播机理的基础上确定了人工林UHF频段传播损耗的三大组成部分及相应的计算方法,提出了人工林中某接收点处电场强度的预测模型.经过对北京西山人工侧柏林中不同参数的场强测试数据进行分析,校验了所建模型具有很高的精度.   相似文献   

Host-Specific Phytotoxic Polysaccharide from Apple Tissue Infected by Erwinia amylovora     

Goodman RN  Huang JS  Huang PY 《Science (New York, N.Y.)》1974,183(4129):1081-1082

A toxin isolated from apple fruit tissue infected by Erwinia amylovora is 98 percent galactose in polymeric form, 0.375 percent protein, and has an average molecular weight of approximately 165,000. Young shoots of rosaceous, but not nonrosaceous, species wilt in a manner characteristic of the disease when placed in toxin solutions with concentrations as low as 10 micrograms per milliliter. Varieties of apple and pear susceptible to Erwinia amylovora wilt in 1 to 3 hours, whereas resistant varieties display symptoms 12 to 24 hours after treatment.  相似文献   

Incorrect GenBank Numbers     

Goodman M 《Science (New York, N.Y.)》1993,260(5108):608

  相似文献   

Discovery of intense gamma-ray flashes of atmospheric origin   总被引：1，自引：0，他引：1  

Fishman GJ  Bhat PN  Mallozzi R  Horack JM  Koshut T  Kouveliotou C  Pendleton GN  Meegan CA  Wilson RB  Paciesas WS  Goodman SJ  Christian HJ 《Science (New York, N.Y.)》1994,264(5163):1313-1316

Detectors aboard the Compton Gamma Ray Observatory have observed an unexplained terrestrial phenomenon: brief, intense flashes of gamma rays. These flashes must originate in the atmosphere at altitudes above at least 30 kilometers in order to escape atmospheric absorption and reach the orbiting detectors. At least a dozen such events have been detected over the past 2 years. The photon spectra from the events are very hard (peaking in the high-energy portion of the spectrum) and are consistent with bremsstrahlung emission from energetic (million-electron volt) electrons. The most likely origin of these high-energy electrons, although speculative at this time, is a rare type of high-altitude electrical discharge above thunderstorm regions.  相似文献   

Phylogenetic relations of humans and African apes from DNA sequences in the psi eta-globin region   总被引：17，自引：0，他引：17  

M M Miyamoto  J L Slightom  M Goodman 《Science (New York, N.Y.)》1987,238(4825):369-373

Sequences from the upstream and downstream flanking DNA regions of the psi eta-globin locus in Pan troglodytes (common chimpanzee), Gorilla gorilla (gorilla), and Pongo pygmaeus (orangutan, the closest living relative to Homo, Pan, and Gorilla) provided further data for evaluating the phylogenetic relations of humans and African apes. These newly sequenced orthologs [an additional 4.9 kilobase pairs (kbp) for each species] were combined with published psi eta-gene sequences and then compared to the same orthologous stretch (a continuous 7.1-kbp region) available for humans. Phylogenetic analysis of these nucleotide sequences by the parsimony method indicated (i) that human and chimpanzee are more closely related to each other than either is to gorilla and (ii) that the slowdown in the rate of sequence evolution evident in higher primates is especially pronounced in humans. These results indicate that features (for example, knuckle-walking) unique to African apes (but not to humans) are primitive and that even local molecular clocks should be applied with caution.  相似文献   

Implantation of genetically engineered fibroblasts into mice: implications for gene therapy   总被引：7，自引：0，他引：7  

R F Selden  M J Skoskiewicz  K B Howie  P S Russell  H M Goodman 《Science (New York, N.Y.)》1987,236(4802):714-718

In a variety of human genetic diseases, replacement of the absent or defective protein provides significant therapeutic benefits. As a model for a somatic cell gene therapy system, cultured murine fibroblasts were transfected with a human growth hormone (hGH) fusion gene and cells from one of the resulting clonal lines were subsequently implanted into various locations in mice. Such implants synthesized and secreted hGH, which was detectable in the serum. The function of the implants depended on their location and size, and on the histocompatibility of the donor cells with their recipients. The expression of hGH could be modified by addition of regulatory effectors, and, with appropriate immunosuppression, the implants survived for more than 3 months. This approach to gene therapy, here termed "transkaryotic implantation," is potentially applicable to many genetic diseases in that the transfected cell line can be extensively characterized prior to implantation, several anatomical sites are suitable for implantation, and regulated expression of the gene of therapeutic interest can be obtained.  相似文献   

A simple model for neutrino cooling of the large magellanic cloud supernova     

Spergel DN  Piran T  Loeb A  Goodman J  Bahcall JN 《Science (New York, N.Y.)》1987,237(4821):1471-1473

A simplified analytic model of a cooling hot neutron star, motivated by detailed computer calculations, describes well the neutrinos detected from the recent supernova in the Large Magellanic Cloud. The observations do not require explanations that invoke exotic physics or complicated astrophysics. The parameters in this simple model are not severely constrained: 6.1(-3.6)(+3.5) x 10(52) ergs emitted in electron antineutrinos, a peak temperature of 4.2(-0.8)(+1.2) megaelectron volts, a radius of 27(-15)(+17) kilometers, and a cooling time of 4.5(-2.0)(+1.7) seconds.  相似文献   

Expression and function of the segmentation gene fushi tarazu during Drosophila neurogenesis   总被引：33，自引：0，他引：33  

C Q Doe  Y Hiromi  W J Gehring  C S Goodman 《Science (New York, N.Y.)》1988,239(4836):170-175

Segmentation genes control cell identities during early pattern formation in Drosophila. One of these genes, fushi tarazu (ftz), is now shown also to control cell fate during neurogenesis. Early in development, ftz is expressed in a striped pattern at the blastoderm stage. Later, it is transiently expressed in a specific subset of neuronal precursor cells, neurons (such as aCC, pCC, RP1, and RP2), and glia in the developing central nervous system (CNS). The function of ftz in the CNS was determined by creating ftz mutant embryos that express ftz in the blastoderm stripes but not in the CNS. In the absence of ftz CNS expression, some neurons appear normal (for example, the aCC, pCC, and RP1), whereas the RP2 neuron extends its growth cone along an abnormal pathway, mimicking its sibling (RP1), suggesting a transformation in neuronal identity.  相似文献   

Undergraduate research. Genomics Education Partnership     

Lopatto D  Alvarez C  Barnard D  Chandrasekaran C  Chung HM  Du C  Eckdahl T  Goodman AL  Hauser C  Jones CJ  Kopp OR  Kuleck GA  McNeil G  Morris R  Myka JL  Nagengast A  Overvoorde PJ  Poet JL  Reed K  Regisford G  Revie D  Rosenwald A  Saville K  Shaw M  Skuse GR  Smith C  Smith M  Spratt M  Stamm J  Thompson JS  Wilson BA  Witkowski C  Youngblom J  Leung W  Shaffer CD  Buhler J  Mardis E  Elgin SC 《Science (New York, N.Y.)》2008,322(5902):684-685

  相似文献