弯曲杆菌的流行病学、生态学及其可能的控制方法     

Diane Newell  罗天海 《国外畜牧学(猪与禽)》2006,26(2):32-34

由于生物安全措施最多只能预防弯曲杆菌的传染,仅仅起到推迟感染的目的。因此,今后需要在整个食品生产链采取新型和持续的干预措施解决弯曲杆菌的传染问题。  相似文献   

Esophageal transit of capsules in clinically normal cats     

Graham JP  Lipman AH  Newell SM  Roberts GD 《American journal of veterinary research》2000,61(6):655-657

OBJECTIVE: To evaluate the esophageal passage of capsules in clinically normal cats and determine the incidence of prolonged transit or entrapment. ANIMALS: 12 clinically normal adult cats. PROCEDURE: Esophageal transit of barium sulfate-filled capsules was evaluated fluoroscopically. Each cat was examined 3 times (36 examinations). Esophageal transit times were classified as normal (< or = 30 seconds) or prolonged (> 30 but < or = 240 seconds). Capsules were considered entrapped when transit times were > 240 seconds. RESULTS: Transit times were normal in 10 of the 36 (27.8%) examinations, whereas times were prolonged in 7 (19.4%) examinations. Capsules became entrapped in the midcervical region of the esophagus during 19 (52.8%) examinations. Following termination of each examination, cats with entrapped capsules were fed a small amount (0.5 to 1 ounce) of food; this resulted in passage of the capsule to the stomach. CONCLUSIONS AND CLINICAL RELEVANCE: The possibility of medication-induced esophagitis should be considered when orally administering ulcerogenic drugs to cats. It is recommended that a small volume of food be given following medications to ensure complete esophageal clearance.  相似文献   

Fatal Myocardial Degeneration in an Adult Quarter Horse with Vitamin E Deficiency     

Robert Barigye BVM  MSc  PhD  Neil W. Dyer DVM  MS  ACVP  Teresa K. Newell DVM  PhD  ACVP 《Journal of Equine Veterinary Science》2007,27(9):405-408

A carcass of an adult female Quarter Horse that spontaneously died was received for general investigation at the veterinary diagnostic laboratory of North Dakota State University. Routine necropsy examination demonstrated multiple pale and firm foci in the heart that were histologically consistent with severe myocardial degeneration/necrosis and fibrosis. Analysis of a liver sample confirmed a suboptimal vitamin E level and a selenium value that was within reference range. Because there was no anamnestic indication for ingestion of cardiotoxic plants or evidence of other etiologic factors, vitamin E deficiency was concluded to have led to the development of the myocardial lesions, which precipitated acute heart failure resulting in sudden death.  相似文献   

Scientific Communication     

Newell RR 《Science (New York, N.Y.)》1952,116(3001):19-20

  相似文献   

Electromechanical properties of graphene drumheads     

Klimov NN  Jung S  Zhu S  Li T  Wright CA  Solares SD  Newell DB  Zhitenev NB  Stroscio JA 《Science (New York, N.Y.)》2012,336(6088):1557-1561

We determined the electromechanical properties of a suspended graphene layer by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) measurements, as well as computational simulations of the graphene-membrane mechanics and morphology. A graphene membrane was continuously deformed by controlling the competing interactions with a STM probe tip and the electric field from a back-gate electrode. The probe tip-induced deformation created a localized strain field in the graphene lattice. STS measurements on the deformed suspended graphene display an electronic spectrum completely different from that of graphene supported by a substrate. The spectrum indicates the formation of a spatially confined quantum dot, in agreement with recent predictions of confinement by strain-induced pseudomagnetic fields.  相似文献   

SECTION OF HISTORY OF CHEMISTRY     

Daines FB  Newell LC 《Science (New York, N.Y.)》1924,60(1543):87-88

  相似文献   

STUDIES ON THE GROWTH OF RATS RAISED ON CHOCOLATE MILK     

Newell GW  Elvehjem CA 《Science (New York, N.Y.)》1944,99(2577):411-412

  相似文献   

Zircon ages of felsic volcanic rocks in the upper precambrian of the blue ridge, appalachian mountains     

Rankin DW  Stern TW  Reed JC  Newell MF 《Science (New York, N.Y.)》1969,166(3906):741-744

Five Zirconi samples from Pennsylvania, Virginia, and North Carolina yield discordant uranium-lead ages which suggest an original age of 820 million years and an episodic lead loss at 240 million years. The indicated age of lead loss is interpreted as the age of movement of the Blue Ridge thrust sheet.  相似文献   

Use of overlap studies to evaluate method changes in water chemistry protocols     

Avis D. Newell  Marilyn L. Morrison 《Water, air, and soil pollution》1993,67(3-4):433-456

Long-term monitoring projects are usually plagued with method changes that occur in the midst of the monitoring record. Such changes can affect the data, resulting in observations of long-term trends that reflect the change in methods rather than the monitored system. This article describes two statistical approaches to evaluate the effect of method changes, illustrated by several examples from the U.S. Environmental Protection Agency's Long-Term Monitoring Project, a study of the effects of acidic deposition on surface water chemistry. Structural regression models or paired t-tests were applied to various overlapping datasets to determine whether statistically significant differences existed between methods. Statistically significant differences between method changes were seen for each of the following: different filter types, a change in anion analysis from colorimetric to ion Chromatographic techniques, and a change in sample collection method from an integrated hose sampler to a Kemmerer sampler. The characteristics under which each statistical approach was applied are discussed, as are considerations regarding calibration of the older portions of the data.  相似文献   

Holocene changes in sea level: evidence in micronesia     

Shepard FP  Curray JR  Newman WA  Bloom AL  Newell ND  Tracey JI  Veeh HH 《Science (New York, N.Y.)》1967,157(3788):542-544

Investigation of 33 islands, scattered widely across the Caroline and Marshall Island groups in the Central Pacific revealed no emerged reefs in which corals had unquestionably formed in situ, or other direct evidence of postglacial high stands of sea level. Low unconsolidated rock terraces and ridges of reefflat islands, mostly lying between tide levels, were composed of rubble conglomerates; carbon-14 dating of 11 samples from the conglomerates so far may suggest a former slightly higher sea level (nine samples range between 1890 and 3450 and one approaches 4500 years ago). However, recent hurricanes have produced ridges of comparable height and material, and in the same areas relics from World War II have been found cemented in place. Thus these datings do not in themselves necessarily indicate formerly higher sea levels. Rubble tracts are produced by storms under present conditions without any change in datum, and there seems to be no compelling evidence that they were not so developed during various periods in the past.  相似文献