How surface topography relates to materials' properties     

Assender H  Bliznyuk V  Porfyrakis K 《Science (New York, N.Y.)》2002,297(5583):973-976

The topography of a surface is known to substantially affect the bulk properties of a material. Despite the often nanoscale nature of the surface undulations, the influence they have may be observed by macroscopic measurements. This review explores many of the areas in which the effect of topography is macroscopically relevant, as well as introducing some recent developments in topographic analysis and control.  相似文献   

Induction of zinc deficiency in sheep and its correction with a soluble glass bolus containing zinc     

Kendall NR  Telfer SB 《The Veterinary record》2000,146(22):634-637

Balance studies were carried out on four Suffolk-cross lambs which were fed a diet containing only 1.2 mg zinc/kg dry matter; zinc deficiency was induced within three weeks. After a period during which the deficiency was relieved by a pica, the zinc deficient state was re-established. Each sheep was then treated with a soluble glass bolus containing zinc, cobalt and selenium. The plasma zinc concentration of the sheep rapidly increased and was maintained for between six and 10 weeks. The bolus was able to supply the daily requirement of the sheep for zinc, with no detrimental effect on their copper status.  相似文献   

Precipitating antibodies to infection with Fasciola hepatica in rabbits     

I J Sinclair  S B Kendall 《Research in veterinary science》1969,10(5):483-485

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Precision agriculture technology adoption: a qualitative study of small-scale commercial “family farms” located in the North China Plain     

Kendall  Helen  Clark  Beth  Li  Wenjing  Jin  Shan  Jones  Glyn. D.  Chen  Jing  Taylor  James  Li  Zhenhong  Frewer  Lynn. J. 《Precision Agriculture》2022,23(1):319-351

Precision Agriculture - Precision agriculture (PA) technologies offer a potential solution to food security and environmental challenges but, will only be successful if adopted by farmers. Adoption...  相似文献   

The influence of bottom type and shelf position on biodiversity of tropical fish inside a recently enlarged marine reserve     

Matthew S. Kendall  John D. Christensen  Christopher Caldow  Michael Coyne  Christopher Jeffrey  Mark E. Monaco  Wendy Morrison  Zandy Hillis‐Starr 《水产资源保护:海洋与淡水生态系统》2004,14(2):113-132

• 1. A necessary component of implementing a successful marine reserve is the quantification of the biological resources that fall under its protection. Without such an initial assessment, the future effects of the reserve on the local habitat and biotic community cannot be quantified and will remain the subject of debate.
• 2. This study provides such a baseline assessment of fish diversity and habitat types within a recently enlarged marine reserve. Buck Island Reef National Monument, US Virgin Islands, was recently enlarged from approximately 4 km² to over 76 km². Areas of sand, seagrass, and hard‐bottom under protection were increased from 0.29 km², 0.47 km², and 1.96 km² to 2.70 km², 2.89 km², and 18.30 km² respectively when the Monument was expanded. A 53 km² area of pelagic/deep‐water habitat with unknown bottom type is now also protected by the Monument.
• 3. Visual counts of fish within 25×4 m² transects conducted during the day were used to assess fish community structure and habitat utilization patterns. Species richness, diversity, assemblage structure, and fish density were evaluated and compared among sand, seagrass, and hard‐bottom habitats. Hard‐bottom sites had over twice the mean species richness and diversity as sand and seagrass sites, and several times greater mean fish density.
• 4. Quantification of the fish community in pelagic and deep‐water habitats within the reserve is recommended to provide a more comprehensive assessment of the offshore areas of the reserve. Fish numbers, size, and diversity outside the reserve boundaries must also be evaluated to allow quantification of the effects of the marine reserve on the adjacent fish communities.

Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Immune‐mediated haemolytic anaemia: Drug induced or not?     

A. Kendall  J. Pringle 《Equine Veterinary Education》2014,26(5):234-236

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A whiff of oxygen before the great oxidation event?   总被引：1，自引：0，他引：1  

Anbar AD  Duan Y  Lyons TW  Arnold GL  Kendall B  Creaser RA  Kaufman AJ  Gordon GW  Scott C  Garvin J  Buick R 《Science (New York, N.Y.)》2007,317(5846):1903-1906

High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia. Correlations with organic carbon indicate that these metals were derived from contemporaneous seawater. Rhenium/osmium geochronology demonstrates that the enrichment is a primary sedimentary feature dating to 2501 +/- 8 million years ago (Ma). Molybdenum and rhenium were probably supplied to Archean oceans by oxidative weathering of crustal sulfide minerals. These findings point to the presence of small amounts of O2 in the environment more than 50 million years before the start of the Great Oxidation Event.  相似文献   

Shark pit organs: response to chemicals     

Y Katsuki  K Yanagisawa  A L Tester  J I Kendall 《Science (New York, N.Y.)》1969,163(865):405-407

Nerve fibers from pit organs and canal neuromasts are distinguished by the nature of their electrophysiological response to mechanical and chemical stimulation. Pit organs respond to touch but have a relatively high threshold compared with canal neuromasts. They respond readily to sodium and potassium chloride solutions, the rate of discharge increasing with the concentration of the solution. Order of effectiveness with 1 molar solutions of monovalent cations is as follows: potassium, rubidium > sodium, ammonium > cesium, lithium. Anions are ineffective. Divalent cations such as calcium and magnesium are inhibitory. Responses to acid, sugar, and quinine are either very slight or inhibitory.  相似文献   

Letters     

Kendall DL 《Science (New York, N.Y.)》1968,160(3824):135-136

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SEPARATIONS BY THE IONIC MIGRATION METHOD     

Kendall J 《Science (New York, N.Y.)》1928,67(1728):163-167

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