Developments in veterinary science. Polioencephalomalacia (cerebrocortical necrosis).   总被引：1，自引：1，他引：0       下载免费PDF全文

F M Loew  O M Radostits    R H Dunlop 《The Canadian veterinary journal. La revue veterinaire canadienne》1969,10(2):54-56

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Drugs: their uses and abuses, and the problem of their control     

D Dunlop 《The Veterinary record》1969,85(16):424-429

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Evidence for freedom from Johne's disease in cattle and goats in Western Australia   总被引：1，自引：0，他引：1  

TM ELLIS  RT NORRIS  PAJ MARTIN  RH CASEY  CD HAWKINS 《Australian veterinary journal》1998,76(9):630-633

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Neosciara (Lycoria) Auripila als Secundair Parasiet in Rogge     

M. J. Dunlop 《European journal of plant pathology / European Foundation for Plant Pathology》1946,52(3):89-90

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Bilateral renal agenesis in two cavalier King Charles spaniels     

Yates GH  Sanchez-Vazquez MJ  Dunlop MM 《The Veterinary record》2007,160(19):672

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Finite element modeling of the cyclic wetting mechanism in the active part of wheat awns     

GA Zickler  D Ruffoni  JW Dunlop  R Elbaum  R Weinkamer  P Fratzl  T Antretter 《Biointerphases》2012,7(1-4):42

Many plant tissues and organs are capable of moving due to changes in the humidity of the environment, such as the opening of the seed capsule of the ice plant and the opening of the pine cone. These are fascinating examples for the materials engineer, as these tissues are non-living and move solely through the differential swelling of anisotropic tissues and in principle may serve as examples for the bio-inspired design of artificial actuators. In this paper, we model the microstructure of the wild wheat awn (Triticum turgidum ssp. dicoccoides) by finite elements, especially focusing on the specific microscopic features of the active part of the awn. Based on earlier experimental findings, cell walls are modeled as multilayered cylindrical tubes with alternating cellulose fiber orientation in successive layers. It is shown that swelling upon hydration of this system leads to the formation of gaps between the layers, which could act as valves, thus enabling the entry of water into the cell wall. This supports the hypothesis that this plywood-like arrangement of cellulose fibrils enhances the effect of ambient humidity by accelerated water or vapor diffusion along the gaps. The finite element model shows that a certain distribution of axially and tangentially oriented fibers is necessary to generate sufficient tensile stresses within the cell wall to open nanometer-sized gaps between cell wall layers.  相似文献   

Cardiopulmonary measurements in dogs undergoing gastropexy without gastrectomy for correction of gastric dilatation-volvulus.     

A E Wagner  C I Dunlop  P L Chapman 《Journal of the American Veterinary Medical Association》1999,215(4):484-488

OBJECTIVE: To measure cardiopulmonary variables, including cardiac index, in dogs with naturally acquired gastric dilatation-volvulus (GDV). DESIGN: Prospective clinical study. ANIMALS: 6 dogs with GDV. PROCEDURE: In addition to typical medical and surgical management of GDV, the dorsal metatarsal and pulmonary arteries and right atrium of the dogs were catheterized to obtain cardiopulmonary measurements before and during anesthesia and surgery. RESULTS: All dogs underwent gastropexy but none required gastrectomy. Mean cardiac index and mean arterial blood pressure for this small population of dogs with GDV were not significantly different from those reported for clinically normal awake or anesthetized dogs. CONCLUSIONS AND CLINICAL RELEVANCE: Dogs with naturally acquired GDV without gastric necrosis may not have the classic characteristics, including decreased cardiac index and hypotension, of hypovolemic circulatory shock.  相似文献   

Integrated optoelectronic devices based on conjugated polymers   总被引：1，自引：0，他引：1  

H Sirringhaus  N Tessler  RH Friend 《Science (New York, N.Y.)》1998,280(5370):1741-1744

An all-polymer semiconductor integrated device is demonstrated with a high-mobility conjugated polymer field-effect transistor (FET) driving a polymer light-emitting diode (LED) of similar size. The FET uses regioregular poly(hexylthiophene). Its performance approaches that of inorganic amorphous silicon FETs, with field-effect mobilities of 0.05 to 0.1 square centimeters per volt second and ON-OFF current ratios of >10(6). The high mobility is attributed to the formation of extended polaron states as a result of local self-organization, in contrast to the variable-range hopping of self-localized polarons found in more disordered polymers. The FET-LED device represents a step toward all-polymer optoelectronic integrated circuits such as active-matrix polymer LED displays.  相似文献   

Carbon structures with three-dimensional periodicity at optical wavelengths   总被引：1，自引：0，他引：1  

AA Zakhidov  RH Baughman  Z Iqbal  C Cui  I Khayrullin  SO Dantas  J Marti  VG Ralchenko 《Science (New York, N.Y.)》1998,282(5390):897-901

Porous carbons that are three-dimensionally periodic on the scale of optical wavelengths were made by a synthesis route resembling the geological formation of natural opal. Porous silica opal crystals were sintered to form an intersphere interface through which the silica was removed after infiltration with carbon or a carbon precursor. The resulting porous carbons had different structures depending on synthesis conditions. Both diamond and glassy carbon inverse opals resulted from volume filling. Graphite inverse opals, comprising 40-angstrom-thick layers of graphite sheets tiled on spherical surfaces, were produced by surface templating. The carbon inverse opals provide examples of both dielectric and metallic optical photonic crystals. They strongly diffract light and may provide a route toward photonic band-gap materials.  相似文献   

Active Immunization against Gonadotrophin-releasing Hormone in Chinese Male Pigs   总被引：1，自引：0，他引：1  

XY Zeng  JA Turkstra  DFM van de Wiel  DZ Guo  XY Liu  RH Meloen  WMM Schaaper  FQ Chen  HB Oonk  & X Zhang 《Reproduction in domestic animals》2001,36(2):101-105

We have investigated, under the normal conditions of local Chinese pig farming, castration of young male pigs by vaccination with a newly developed vaccine against gonadotrophin releasing hormone (GnRH). Because of the very early onset of puberty, long fattening period and relatively harsh circumstances in Chinese pig production, an investigation of the endocrine response of Chinese breeds to this type of vaccination was of particular interest. Fifteen crossbred boars (Yorkshire × Yanan) from three different litters were randomly assigned to three groups of five animals each. The first group was immunized at 13 weeks of age with a GnRH tandem dimer OVA‐conjugate in Specol and received a booster immunization 8 weeks later. The second group was injected with Specol alone and served as untreated controls. The remaining group was surgically castrated at the time of weaning (at 6 weeks of age). Pigs were fed ad libitum from weaning onwards. All animals were slaughtered at 31 weeks of age. Immunized boars had undetectable or low serum testosterone (0.09 ± 0.12 ng/ml), low fat androstenone (0.05 ± 0.01 μg/g) levels and very low testes weights (19.1 ± 4.3 g). Intact controls had much higher serum levels of testosterone (9.76 ± 4.81 ng/ml), fat androstenone levels (2.26 ± 0.87 μg/g) and testes weights (114.3 ± 29.41 g) at slaughter. Both the immunized and castrated group grew significantly faster than intact boars (p < 0.01). Average daily gains in immunized, castrated and intact animals were 0.69 ± 0.08, 0.63 ± 0.05 and 0.42 ± 0.07 kg (mean ± SD), respectively. The present data demonstrate for the first time that the newly developed anti‐GnRH vaccine works very well under practical Chinese pig farming conditions, and can be an attractive alternative to surgical castration.  相似文献