MicroRNAs modulate hematopoietic lineage differentiation   总被引：8，自引：0，他引：8  

Chen CZ  Li L  Lodish HF  Bartel DP 《Science (New York, N.Y.)》2004,303(5654):83-86

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Observation of a subsurface oil-rich layer in the open ocean     

Harvey GR  Requejo AG  McGillivary PA  Tokar JM 《Science (New York, N.Y.)》1979,205(4410):999-1001

A layer of water at a depth of 200 meters containing 3 to 12 milligrams per liter of oil was found during February and March 1978 over a distance of 800 nautical miles in the southwest North Atlantic and the eastern Caribbean. The geochemistry and carbon-14 activity of the oil shows it to be a weathered crude, probably from a submarine seep. Although the dimensions of the oily layer were not determined, conservative estimates indicate that more than I megaton could have been present.  相似文献   

DESTRUCTION OF ZOOSPORES OF PLANT DISEASE ORGANISMS BY NATURAL ENEMIES     

Harvey RB 《Science (New York, N.Y.)》1920,52(1334):84-85

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From the editor     

Harvey James 《Agriculture and Human Values》2007,24(4):423-424

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Over-canopy saline sprinkler irrigation of grapevines during different growth stages     

Rob M. Stevens  Gordon Harvey  Scott Norton  William Frahn 《Agricultural Water Management》2011,101(1):62-70

Wetting plant foliage with saline irrigation increases the uptake of toxic ions Na⁺ and Cl⁻. Over three consecutive seasons, Colombard vines grafted on Ramsey rootstock were irrigated with saline water (EC 3.5 dS/m) by over-canopy sprinklers during any one of the first three of the four annual growth stages: bud burst to full bloom (treatment BB-FB), full bloom to veraison (treatment FB-V), and veraison to harvest (treatment V-H). At other times, vines received non-saline water (EC 0.5 dS/m) as did the control. Seasonal average soil salinities remained relatively constant over the trial. In contrast, the concentrations of Na⁺ and Cl⁻ in one-year old wood and grape juice more than doubled. In treatments FB-V and V-H the average yield over the three seasons was reduced by up to 15%. Results were compared with those obtained in an earlier study which was undertaken in the same vineyard with the same treatments applied via dripper. With drippers, the maximum reduction in the average yield over three seasons was 2%. Saline sprinkling caused rises in Na⁺ and Cl⁻ concentrations of fruit, leaf lamina and one-year-old wood that were at least 7-fold, 5-fold and 2-fold greater, respectively, than the rises caused by application of the same treatments with drip. Progressive seasonal rises in the concentrations of Na⁺ and Cl⁻ in these tissues were due in part to carryover of salt added in previous seasons; with saline sprinkling the magnitude of these carryovers was 4-fold greater than those with saline drip irrigation. With saline water, vignerons can reduce losses by using irrigation systems which do not wet the foliage.  相似文献   

Application of shallow seismic refraction techniques to coastal geomorphology: A coral reef example     

Nick Harvey 《CATENA》1977,4(4):333-339

Shallow refraction techniques have an advantage over continuous profiling systems where marine environments preclude the use of this equipment or when cost is a restrictive factor. Operational problems peculiar to the use of the portable refraction seismograph in the coastal environment are discussed using field examples from the Great Barrier Reef Australia.  相似文献   

Bone concentration of manganese in white sucker (Catostomus commersoni) from acid,circumneutral and metal-stressed lakes     

H. H. Harvey  G. A. Fraser  J. M. McArdle 《Water, air, and soil pollution》1986,30(1-2):515-521

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THE MECHANISM OF LIGHT PRODUCTION IN ANIMALS     

Harvey EN 《Science (New York, N.Y.)》1916,44(1128):208-209

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Otoacoustic emission in a dog     

M H Sims  J J Brace  D A Arthur  R C Harvey 《Journal of the American Veterinary Medical Association》1991,198(6):1017-1018

A 7-month-old female Poodle was evaluated for a sound continuously emanating from its left ear. The frequency and intensity of the tone was matched by use of a multifrequency audiometer. The frequency and intensity of the sound were 9,594 Hz and 45.5 decibels sound pressure level, respectively. On the bases of normal brain stem auditory-evoked responses and behavioral response to sound, the dog was believed to have normal hearing in both ears. Emission of sound from an ear, referred to as an otoacoustic emission, is a condition that has been reported in human beings and small animals. Successful treatment in human patients with drugs and masking sounds is difficult, and treatment has not been reported in animals. This condition in dogs is not considered life-threatening.  相似文献   

ULTRASONIC DETERMINATION OF KIDNEY VOLUME IN THE DOG     

Thomas G.  Nyland  DVM  Brett M.  Kantrowitz  DVM  †Paul  Fisher  Harvey J.  Olander  DVM  PHD‡  William J.  Hornof  DVM  MS 《Veterinary radiology & ultrasound》1989,30(4):174-180

Canine kidney measurements were obtained in vivo using ultrasound before and after anesthesia and were compared with direct caliper measurements at laparotomy. Following excision, the kidney dimensions were also measured ultrasonically in a water bath and the results were used to calculate kidney -volume by a modified parallel planimetric method and three variations of a prolate ellipsoid method. The calculated volume was compared with actual kidney volume determined by volume displacement. All methods were found to underestimate actual volume so that a linear correction of ultrasonically calculated volume was required to predict actual volume. The modified parallel planimetric method and a prolate ellipsoid method using height and width determinations cranial and caudal to the renal pelvis were the best models. The prolate ellipsoid model was chosen for subsequent kidney volume calculations because of its simplicity. The noninvasive calculation of kidney volume using ultrasound was sufficiently accurate to be clinically useful, particularly when serially evaluating kidney size changes in the same dog.  相似文献