戊型肝炎病毒研究新进展   总被引：3，自引：0，他引：3  

窦守强  唐延平  蓝赐华  李和平  罗满林 《中国兽药杂志》2007,41(3):32-34

戊型肝炎病毒(hepatitis Evirus,HEV)是非甲非乙型急性肝炎的病原体,主要经粪-口途径传播,也有报道可以通过血液传播。戊型肝炎在亚洲、非洲及美洲的墨西哥等发展中国家常呈爆发流行,我国1986-1988年在新疆曾经发生戊型肝炎暴发流行[1],而在包括发达国家在内的世界各地呈散在传  相似文献   

Parameters of the Reproductive Tract,Spermatogenesis, Daily Sperm Production and Major Seminal Plasma Proteins of Tropically Adapted Morada Nova Rams     

FML Sousa  CH Lobo  ESB Menezes  JPA Rego  RV Oliveira  AC Lima‐Souza  M Fioramonte  FC Gozzo  RCFF Pompeu  MJD Cândido  JT Oliveira  AA Moura 《Reproduction in domestic animals》2014,49(3):409-419

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Microscopic Particle Motions in Strongly Coupled Dusty Plasmas     

L I  WT Juan  CH Chiang  JH Chu 《Science (New York, N.Y.)》1996,272(5268):1626-1628

The microscopic particle motions from the crystal to the disordered state of a dusty plasma with micrometer-sized silicon dioxide particle suspensions in a radio-frequency glow discharge system were studied through an optical microimaging system. Small-amplitude random motion around the lattice sites of the crystal state, relative domain motion with varying boundaries, cooperative hopping in the liquid state, and highly disordered motion with increasing radio-frequency power were observed. Chaotic states with different spatial scales under the coherent and stochastic coupling between dust particles and self-organized background plasma fluctuations were also demonstrated.  相似文献   

辽宁省水稻害虫灾变规律和综合防治研究进展   总被引：2，自引：1，他引：2  

田春晖  孙富余  王小奇 《辽宁农业科学》2000,(4):18-22

本文是“八·五”、“九·五”( 1 991～ 2 0 0 0年 )以来辽宁省水稻害虫研究的综述。1　辽宁省水稻主要害虫及其成因概述在中国 ,以水稻为寄主的昆虫约 350种 ,具有经济意义的所谓害虫 60余种[1] 。历来认为 ,北方稻区 ,尤其是“东北半湿润早熟单季稻作区”水稻虫害发生较轻 ,只有几种在局部有不同程度危害 ,文献记载及专题研究甚少[2 ,3] 。但是 ,专家预测认为 :旱地改水田等原因使稻作面积不断扩大 ,可能加重原有害虫 ,也可能引发新的害虫[4] 。直到1 0年前 ,有关北方水稻害虫情况还不甚明确。据不完全统计 ,截止 1 995年 ,涉及辽宁省水…  相似文献   

Greenhouse technique to evaluate onion resistance to pink root   总被引：1，自引：0，他引：1  

D. Netzer  H. D. Rabinowitch  CH. Weintal 《Euphytica》1985,34(2):385-391

Summary An assay for resistance of onion to pink root Pyrenochaeta terrestris was developed, employing infested vermiculite medium with an adequate inoculum concentration of the fungus to minimize escapes of susceptible plants.Plant material other than seed was used. Either root-excised 6–8 week-old seedlings or onion sets were planted in infested vermiculite, and kept for two successive 2-week periods of growth differing in light and temperature regimes. During the first phase a short-day regime of 10 h and 17±1°C was kept, under which a vigorous root system was obtained. For an additional 12–14 days under 26±1°C and 12 h light the prolific roots were then exposed to the optimal temperature for disease development.This technique enables one to distinguish easily between susceptible Allium cepa material and a resistant line of A. fistulosum.Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. No. 1022-E, 1984 series.  相似文献   

BAER testing in a dog with bilateral external ear canal atresia     

Anwer C  Schwarz T  Volk SW  Vite C 《Journal of the American Animal Hospital Association》2011,47(5):370-374

A 3 yr old male castrated Labrador retriever presented for evaluation and treatment of bilateral atresia of the external ear canals. The owners reported that the dog could hear only loud and high-pitched noises. Computed tomography of the head revealed intact vertical and horizontal ear canals filled with debris and a debris-filled right tympanic bulla. Air- and bone-conducted brainstem auditory evoked response (BAER) testing revealed an elevated response threshold to air-conducted stimuli and greater amplitude waveforms evoked by bone-conducted stimuli. The ear canals were surgically corrected via lateral ear canal resection. BAER testing postoperatively revealed a decrease in the air-conducted BAER threshold. This case is an example of the use of bone-conducted BAER testing to aid in the diagnosis of conductive deafness, and in determining prognosis for normal hearing after surgical treatment of external ear canal atresia.  相似文献   

Patterns of distribution of assimilates in tubers ofSolanum tuberosum L. with time     

CH. M. S. Ahmed  G. R. Sagar 《Potato Research》1981,24(2):187-190

Summary Autoradiographic studies showed the patterns of arrival and subsequent distribution of¹⁴C-labelled assimilates in the potato tuber. The internal phloem was the principal route of entry of assimilates which subsequently became more evenly distributed throughout the tuber. The patterns of distribution within the tuber following a single pulse (1 hour) feeding of¹⁴CO₂ continued to change for more than seven days afterwards. Between three and seven days after feeding an area corresponding to the xylem became almost devoid of¹⁴C-label and after fourteen days the phloem strands appeared to have ceased to carry assimilates. These observations are discussed.  相似文献   

Die Zuverlässigkeit der visuellen Selektion in der ersten Klongeneration von Kartoffeln     

CH. Pfeffer  K. H. Möller  M. Scholz  H. G. Zschüttig 《Potato Research》1988,31(1):17-23

Zusammenfassung Eine Population der ersten Klongeneration mit einem eingefügten Kontrollsortiment wurde an vier Orten ausgepflanzt und durch vier Züchter visuell nach der Methode der negativen Selektion selektiert. Es wurden signifikante Einflüsse der Orte, Jahre und Züchter ermittelt. Die Effizienz kann durch die aktuelle Optimierung der Selektionsgrenzen anhand des Kontrollsortiments erh?ht werden. Ausserdem wird erfolgreich praktiziert, die Populationen aus zwei Knollen je Genotyp zusammenzufügen oder im Rahmen der internationalen Zusammenarbeit der L?nder des Rates für Gegenseitige Wirtschaftshilfe an zwei Orten auszupflanzen.

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Summary A population of first clonal generation material was planted at four sites and selected visually by four breeders using the method of negative selection. Six table cultivars of potato that displayed appropriate levels of the characters under consideration, and six that did not, were planted at random throughout the population as standards. There were significant effects for site, year and breeder. The variance for sites was ca. 2 1/2 times that for the breeders (Tables 1 and 2), with about twice as many positive cultivars selected at site 1 as at site 3 (Table 3). There were also differences in selection results between breeders (Table 4). The uncertainty of visual selection of single plants is obvious from Table 5. Results from two years show a marked effect of year (Table 6). The relative frequencies of wrongly rejected (loss risk — Verlustrisiko) and wrongly selected (ballast risk — Ballastrisiko) standards are shown in Table 7. Only a few negative genotypes (standards) were selected, but there was a considerable loss of positive genotypes. The expected values of the standards and their actual selection results are being used to optimize the selection limits. The exploitation of populations can largely be ensured in bad years or sites, without the use of indicators and individual handling of clones with several tubers, by bulking two tubers per genotype from the first vegetative progeny. This measure may be restricted to highly valuable combinations. The possibility of accidentally selecting identical genotypes can be corrected in later generations simply by electrophoresis of soluble tuber proteins. Growing the population at two sites, best done through the framework of international co-operation, improves the likelihood of optimizing screening.

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Serratospiculosis in a New Zealand Falcon (Falco novaeseelandiae)     

CH Green  BD Gartrell  WAG Charleston 《New Zealand veterinary journal》2013,61(4):198-201

CASE HISTORY: An adult New Zealand falcon was presented with metacarpal fractures in the left wing.

CLINICAL FINDINGS: In addition to the fractures, radiographs revealed an area of opacity in the air sacs. A few days after hospitalisation and initiation of treatment of the fractures, the bird developed signs of respiratory disease; the area of opacity was found to have increased in size and density. Treatment with antibiotics and nebulisation was commenced; the bird initially responded but respiratory signs subsequently worsened and the bird died. At necropsy, air sacculitis and bronchopneumonia were associated with numerous nematodes in the air sacs, which were morphologically consistent with Serratospiculum guttatum.

DIAGNOSIS: Serratospiculosis

CLINICAL RELEVANCE: The discovery of this parasite and the associated disease for the first time in New Zealand indicates that it should be considered in the differential diagnosis of respiratory disease in falcons and possibly other raptors in New Zealand.  相似文献   

Performance,health and behaviour of organic growing-finishing pigs in two different housing systems with or without access to pasture     

J. A. M. Botermans  A.-CH. Olsson  M. Andersson  CH. Bergsten  J. Svendsen 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(3-4):158-167

Abstract

The effects of two housing systems (deep litter and straw-flow), with and without access to pasture during the summer period, were studied in an organic growing-finishing pig herd. Performance, health, skin lesions and daytime pig activity were studied in 29 pens of 16 pigs (total of 464 pigs, in 4 batches). Data from 21 pens were used for comparisons of deep litter and straw-flow and data from 16 pens for comparisons of access/no access to pasture. Pigs in the deep litter system had a lower carcass meat percentage (56.6% vs. 57.3%) and more locomotion problems (4.4% vs. 0%) than pigs in the straw-flow system. No difference in daytime pig activity was detected between the two housing systems. Under moderate temperatures, pigs with access to pasture and fed a commercial organic feed inside the building were not more active during daytime behaviour studies (7.30?h–16.30?h) than pigs without access to pasture. However, at 17 weeks of age the pigs with pasture access spent 21% of their time on pasture, less time inside the pig house (20% vs. 33%) and less time on the outside concrete area (4% vs. 12%) than the pigs without pasture. No difference in performance was detected between pigs with and pigs without access to pasture.  相似文献