Radiation hybrid mapping: a somatic cell genetic method for constructing high-resolution maps of mammalian chromosomes   总被引：69，自引：0，他引：69  

D R Cox  M Burmeister  E R Price  S Kim  R M Myers 《Science (New York, N.Y.)》1990,250(4978):245-250

Radiation hybrid (RH) mapping, a somatic cell genetic technique, was developed as a general approach for constructing long-range maps of mammalian chromosomes. This statistical method depends on x-ray breakage of chromosomes to determine the distances between DNA markers, as well as their order on the chromosome. In addition, the method allows the relative likelihoods of alternative marker orders to be determined. The RH procedure was used to map 14 DNA probes from a region of human chromosome 21 spanning 20 megabase pairs. The map was confirmed by pulsed-field gel electrophoretic analysis. The results demonstrate the effectiveness of RH mapping for constructing high-resolution, contiguous maps of mammalian chromosomes.  相似文献   

Sweet-sensitive protein from bovine taste buds: isolation and assay   总被引：4，自引：0，他引：4  

F R Dastoli  S Price 《Science (New York, N.Y.)》1966,154(751):905-907

Using refractometry and ultraviolet-difference spectroscopy to indicate interaction between proteins and coinpounds of low molecular weight, we found a protein fraction in bovine tongue extracts that coinplexes sugars and saccharin. The strengths of the coinzplexes parallel the degrees of sweetness of the compounds, and the effects of pH upon formation of complexes parallel the effects of pH upon sensitivity of taste buds to sweet compounds in vivo.  相似文献   

Particle Track, X-ray, Thermal, and Mass Spectrometric Studies of Lunar Material     

Fleischer RL  Haines EL  Hanneman RE  Hart HR  Kasper JS  Lifshin E  Woods RT  Price PB 《Science (New York, N.Y.)》1970,167(3918):568-571

Particle tracks in Apollo 11 samples are dominantly of cosmic ray and solar origin: primary galactic and solar flare particles, likely spallation recoil tracks, and possible solar-wind heavy particles. The energy spectrum of irongroup nuclei is inferred from track density gradients in surface layers, and a limit of < 10(-7) centimeter per year is deduced for the surface erosion rate. From cosmic ray tracks in rock and core samples it is clear that the lunar soil is stirred often during each few million years. X-rays reveal augite, anorthite, olivine, ilmenite, troilite, nonmeteoritic iron, and assorted glasses, but no major structural damage. Hydrogen, helium, and other gases in the fines are compatible with expected solar wind ratios.  相似文献   

Bladder tumors in rats fed cyclohexylamine or high doses of a mixture of cyclamate and saccharin   总被引：8，自引：0，他引：8  

J M Price  C G Biava  B L Oser  E E Vogin  J Steinfeld  H L Ley 《Science (New York, N.Y.)》1970,167(921):1131-1132

Papillary transitional cell tumors were found in the urinary bladders in 8 rats out of 80 that received 2600 milligrams per kilogram of body weight per day of a mixture of sodium cyclamate and sodium saccharin (10:1) for up to 105 weeks. From week 79 on, several of these rats received cyclohexylamine hydrochloride (125 milligrams per kilogram per day, the molecular equivalent of the conversion of about 10 percent of the cyclamate dosage to cyclohexylamine) in addition to the sodium cyclamate and sodium saccharin. In another study in which 50 rats were fed daily 15 milligrams of cyclohexylamine sulfate per kilogram of body weight for 2 years, eight males and nine females survived. One of the eight males had a tumor of the urinary bladder. In neither study were bladder tumors found in the control rats or in rats treated with lower doses of the compounds.  相似文献   

Resonant-mass detectors of gravitational radiation     

Michelson PF  Price JC  Taber RC 《Science (New York, N.Y.)》1987,237(4811):150-157

A network of second-generation low-temperature gravitational radiation detectors is nearing completion. These detectors, sensitive to mechanical strains of order 10(-18), are possible because of a variety of technical innovations hat have been made in cryogenics, low-noise superconducting instrumentation, and vibration isolation techniques. Another five orders of magnitude improvement in energy sensitivity of resonant-mass detectors is possible before the linear amplifier quantum limit is encountered.  相似文献   

Attempt to date early South african hominids by using fission tracks in calcite     

Macdougall D  Price PB 《Science (New York, N.Y.)》1974,185(4155):943-944

Calcite crystals extracted from marrow cavities of bones found in hominid-bearing breccias from Makapansgat and Swartkrans were studied for fossil tracks. The absence of the expected numbers of tracks in these and in calcites from Beds I and II, Olduvai Gorge, combined with the results of laboratory heating experiments, indicates that track annealing has occurred at ambient temperatures and precludes the widespread use of calcite for fission track dating.  相似文献   

Feline attractant, cis,trans-nepetalactone: metabolism in the domestic cat     

G R Waller  G H Price  E D Mitchell 《Science (New York, N.Y.)》1969,164(885):1281-1282

cis,trans-Nepetalactone, the biologically active component of catnip, was force-fed to the domestic cat. When the (14)C-labeled compound was fed, 86 to 94 percent of the radioactivity was recovered in the urine, 1 to 2 percent was found in the feces, and 1 to 12 percent was collected as carbon dioxide. The major (50 to 75 percent) metabolite was alpha-nepetalinic acid, which was excreted in the urine together with small amounts of dihydronepetalactone, unchanged cis,-trans-nepetalactone, and several unidentified compounds. No marked physiological or histological eflects were observed when 20 to 80 milligrams of cis, trans-nepetalactone was administered orally. This is the first report on the metabolism of a mammalian attractant.  相似文献   

Fluorescence Microscopy: Use in Intracellular Microscopy     

Price GR 《Science (New York, N.Y.)》1963,141(3585):1111

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THE BIOLOGICAL ACTIVITY OF SYNTHETIC PANTOTHENIC ACID     

Weinstock HH  Arnold A  May EL  Price D 《Science (New York, N.Y.)》1940,91(2365):411

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Scientific research and the innovative process     

W J Price  L W Bass 《Science (New York, N.Y.)》1969,164(881):802-806

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