Chromatic specificity of the visual evoked response     

N W Perry  D G Childers  J C Falgout 《Science (New York, N.Y.)》1972,177(51):813-815

The temporal alternation of red and green stripes in a structured field produces successive contrast, which can elicit cortical potentials recorded from the scalp. Amplitudes of the major frequency components of the potentials correspond to the relative intensities of red and green producing the contrast. The amplitude variations are color-specific, since total luminance and structure are held constant.  相似文献   

Turbulence hits wall     

Perry AE 《Science (New York, N.Y.)》1996,273(5278):1030b-1031b

  相似文献   

A POSSIBLE HORMONE-SECRETING REGION IN THE GRASS COLEOPTILE     

Perry JT 《Science (New York, N.Y.)》1932,76(1966):215-216

  相似文献   

A 5-micron-bright spot on Titan: evidence for surface diversity     

Barnes JW  Brown RH  Turtle EP  McEwen AS  Lorenz RD  Janssen M  Schaller EL  Brown ME  Buratti BJ  Sotin C  Griffith C  Clark R  Perry J  Fussner S  Barbara J  West R  Elachi C  Bouchez AH  Roe HG  Baines KH  Bellucci G  Bibring JP  Capaccioni F  Cerroni P  Combes M  Coradini A  Cruikshank DP  Drossart P  Formisano V  Jaumann R  Langevin Y  Matson DL  McCord TB  Nicholson PD  Sicardy B 《Science (New York, N.Y.)》2005,310(5745):92-95

Observations from the Cassini Visual and Infrared Mapping Spectrometer show an anomalously bright spot on Titan located at 80 degrees W and 20 degrees S. This area is bright in reflected light at all observed wavelengths, but is most noticeable at 5 microns. The spot is associated with a surface albedo feature identified in images taken by the Cassini Imaging Science Subsystem. We discuss various hypotheses about the source of the spot, reaching the conclusion that the spot is probably due to variation in surface composition, perhaps associated with recent geophysical phenomena.  相似文献   

Marcy: A chipping variety with resistance to common scab and the golden nematode     

Walter S. De Jong  Donald E. Halseth  Bill B. Brodie  Keith L. Perry  Joseph B. Sieczka  Barbara J. Christ  Gregory A. Porter  Ken M. Paddock  Michael W. Peck  Robert L. Plaisted 《American Journal of Potato Research》2006,83(2):189-193

‘Marcy’ is a white-skinned, white-fleshed potato cultivar notable for its high yield, good chip color, and resistance to common scab and race Ro1 of the golden cyst nematode. It was selected from a cross made at Cornell University in 1990 between ‘Atlantic’ and Q155-3. Full-season marketable yields of Marcy have averaged 15% to 20% greater than Atlantic in 83 trials across New York, Maine, and Pennsylvania. Specific gravity of Marcy has averaged 0.008 less than Atlantic. Chip color out of 7 C storage in New York has been similar to ‘Pike’, but not as light as ‘Snowden’. Marcy tubers have an attractive oval shape, shallow eyes, and highly textured skin. Marcy was jointly released by the New York and Pennsylvania Agricultural Experiment Stations in 2002.  相似文献   

Folic Acid Content of Ready‐to‐Eat Cereals Determined by Liquid Chromatography‐Mass Spectrometry: Comparison to Product Label and to Values Determined by Microbiological Assay     

Katherine M. Phillips  David M. Ruggio  Mehdi Ashraf‐Khorassani  Ronald R. Eitenmiller  Sungeun Cho  Linda E. Lemar  Charles R. Perry  Pamela R. Pehrsson  Joanne M. Holden 《Cereal Chemistry》2010,87(1):42-49

Twelve popular ready‐to‐eat breakfast cereals fortified with folic acid were sampled in the United States in 2006, and the data have been incorporated into the USDA National Nutrient Database for Standard Reference. Cereals were collected from three statistically selected retail outlets in each of four primary census regions, and four composites of each product were prepared using random groupings of three locations each. Folic acid was determined using a validated LC‐MS method, with ¹³C‐folic acid as an internal standard, after trienzyme treatment and solid phase extraction. A cereal reference material (AACC VMA399) was analyzed as a control. Selected samples were also assayed using the standard microbiological method, with and without trienzyme extraction, to generate an estimate of endogenous folate. On average, as shown on the label, folate content was underestimated. In seven cereals, folate was within 5% of the declared value; in four cereals, it was 5–20% higher; and in two cereals, it was >20% greater, representing –75 to +69 μg/serving (mean 17) of the label value, equivalent to –19% to +17% of the 400 μg/daily value. The microbiologically determined folic acid was higher than LC‐MS by 10–67% (mean 40%). Therefore, use of label values might underestimate folate intake from some breakfast cereals.  相似文献   

Histology and histochemistry of the bovine reproductive tract caudal to the cervix. Part I. The vestibule and associated glands     

N B Blazquez  E H Batten  S E Long  G C Perry 《The British veterinary journal》1987,143(4):328-337

  相似文献