Embryonic Development and Gene Expression in Oocytes Cultured In Vitro in Supplemented Pre‐Maturation and Maturation Media     

PR Adona  THC de Bem  LG Mesquita  RC Rochetti  CLV Leal 《Reproduction in domestic animals》2011,46(1):e31-e38

  相似文献   

Differential Rotation and Dynamics of the Solar Interior     

MJ Thompson  J Toomre  ER Anderson  HM Antia  G Berthomieu  D Burtonclay  SM Chitre  J Christensen-Dalsgaard  T Corbard  M DeRosa  CR Genovese  DO Gough  DA Haber  JW Harvey  F Hill  R Howe  SG Korzennik  AG Kosovichev  JW Leibacher  FP Pijpers  J Provost  EJ Rhodes  J Schou  T Sekii  PB Stark  PR Wilson 《Science (New York, N.Y.)》1996,272(5266):1300-1305

Splitting of the sun's global oscillation frequencies by large-scale flows can be used to investigate how rotation varies with radius and latitude within the solar interior. The nearly uninterrupted observations by the Global Oscillation Network Group (GONG) yield oscillation power spectra with high duty cycles and high signal-to-noise ratios. Frequency splittings derived from GONG observations confirm that the variation of rotation rate with latitude seen at the surface carries through much of the convection zone, at the base of which is an adjustment layer leading to latitudinally independent rotation at greater depths. A distinctive shear layer just below the surface is discernible at low to mid-latitudes.  相似文献   

Modelling the basin-scale demography of Calanus finmarchicus in the north-east Atlantic     

DOUGLAS C. SPEIRS  WILLIAM S.C. GURNEY  MICHAEL R. HEATH  SIMON N. WOOD 《Fisheries Oceanography》2005,14(5):333-358

In this paper, we report on a coupled physical–biological model describing the spatio-temporal distribution of Calanus finmarchicus over an area of the North Atlantic and Norwegian Sea from 56°N, 30°W to 72°N, 20°E. The model, which explicitly represents all the life-history stages, is implemented in a highly efficient discrete space–time format which permits wide-ranging dynamic exploration and parameter optimization. The underlying hydrodynamic driving functions come from the Hamburg Shelf-Ocean Model (HAMSOM). The spatio-temporal distribution of resources powering development and reproduction is inferred from SeaWiFS sea-surface colour observations. We confront the model with distributional data inferred from continuous plankton recorder observations, overwintering distribution data from a variety of EU, UK national and Canadian programmes which were collated as part of the Trans-Atlantic Study of Calanus (TASC) programme, and high-frequency stage-resolved point time-series obtained as part of the TASC programme. We test two competing hypotheses concerning the control of awakening from diapause and conclude that only a mechanism with characteristics similar to photoperiodic control can explain the test data.  相似文献   

长胚芽鞘小麦品种耐深播出苗好   总被引：1，自引：0，他引：1  

文学飞  潘前颖  潘田园  史引红  潘田雨  潘幸来 《小麦研究》2011,(2)

综述澳美欧亚非30多国百多家有关研究表明,胚芽鞘长、细、硬、快的小麦品种耐深播、立苗好。从细胞能性角度阐述胚轴划分并澄清小麦胚芽鞘的错位描述及地中茎的混淆定义。图示双胚苗的第二胚芽鞘自然开裂。图释深播地中拔节现象值得春化学者关注。概述胚芽鞘遗传长度、生理长度及环境长度。提到小麦脂肪优质育种问题。对国内麦学界提出3个具有理论或实践意义的建议。  相似文献   

Urban Development and Knowledge‐Intensive Business Services: Too Many Unanswered Questions?     

PETER WOOD 《Growth and change》2006,37(3):335-361

ABSTRACT It is often assumed that future urban employment will be increasingly dependent on the knowledge‐intensive business services (KIBS). This underpins much of the current thinking about the development of the English “core cites.” Their example is employed to examine the more general validity of such assumptions, in terms of five critical questions to which research offers only partial and indefinite answers. For any city, how far are these activities really “knowledge intensive”? What markets do they serve? Is their future growth certain? And even when this is the case, how can they make a long‐term contribution to local urban economic success? Finally, how far do urban economic institutions and policies need to be adapted to foster knowledge‐based activities such as KIBS? It seems that, despite the growth of measured KIBS employment, most of the core cities possess few truly knowledge‐intensive KIBS, capable of serving national and international business markets, competitively adapting to future change, and adding to the competitiveness of the wider urban economy. Nationally such activities remain focused into the London region where, if anything, they have increased their concentration is recent years.  相似文献   

Evaluation of Methods for Control of Ammonia Volatilization from Surface-Applied Nitrogen Fertilizers to Sugarcane Trash in North Queensland     

KONG WEI-PING  P.G.SAFFIGNA  A.W.WOOD  J.R.FRENEY 《土壤圈》1993,3(4):321-330

Micrometeorological and microplot experiments were conducted in the field of freshly harvested green cane in Queensland,Australia.Results showed that high ammonia loss of fertilizer N could occur under relatively dry conditions when urea or commercial product of mixture of urea and muriate of potash were applied to the surface of sugarcane trash.The moisture content in the trash and the pH of fertilizer were two important factors controlling the processes of urea hydrolysis and ammonia volatilization.Most of the N in the soil was transformed to the nitratel-nitrite from after 70 days of fertilizer application.No significant leaching was found.Urea-free N fertilizers had higher N recoveries compared to urea-containing fertilizers.  相似文献   

Seasonality of sarcoptic mange in pigs in South Australia     

PR DAVIES  MJ MOORE  AM POINTON 《Australian veterinary journal》1991,68(12):390-392

Retrospective analysis of records, from July 1987 to June 1991, of 1140 inspections of slaughtered pigs from 154 swine herds in the Pig Health Monitoring Scheme of South Australia was conducted to evaluate patterns of variation in the prevalence and severity of skin lesions typical of sarcoptic mange. An increase in the severity of sarcoptic mange in winter and spring was observed. There was a substantial reduction in the severity of mange over the period of monitoring. These observations support the role of monitoring at slaughter in the management of endemic disease. They provide some basis for refining control programs for mange to improve cost-effectiveness.  相似文献   

Osteomyelitis in dogs and cats caused by anaerobic bacteria   总被引：1，自引：0，他引：1  

K. A. JOHNSON  G. R. LOMAS †  A. K. W. WOOD 《Australian veterinary journal》1984,61(2):57-61

Localised osteomyelitis was diagnosed in 2 dogs and 2 cats. The disease was caused by fight wounds in 3 cases. Radiographic examination demonstrated a circumscribed zone of cortical bone lysis, sequestra and periosteal new bone. Each case was treated surgically by sequestrectomy and debridement. Infection was due mainly to anaerobic bacteria. The pathogenic bacteria isolated from the lesions of dogs were Actinomyces viscosus, Fusobacterium nucleatum and Bacteroides spp, and from the lesions in cats were Clostridium villosum , Peptostreptococcus anaerobius, Wolinella recta and Bacteroides gingivalis. As all the bacteria were sensitive to penicillin, each case was treated with penicillin and by irrigation of the wound. This resulted in resolution of the disease, within 4 weeks, in all cases.  相似文献   

PYELONEPHRITIS AND CYSTITIS IN SOWS ASSOCIATEDWITH CORYNEBACTERIUM SUIS     

J. S. GLAZEBROOK  B.Sc.    C. DONALDSON WOOD B.V.Sc.  B.Sc.  P. W. LADDS M.V.Sc.  Ph.D. 《Australian veterinary journal》1973,49(11):546-546

  相似文献   

Descriptive epidemiology of fracture,tendon and suspensory ligament injuries in National Hunt racehorses in training     

E. R. ELY  C. S. AVELLA  J. S. PRICE  R. K. W. SMITH  J. L. N. WOOD  K. L. P. VERHEYEN 《Equine veterinary journal》2009,41(4):372-378

Reasons for performing study: While fractures and tendon injuries are known to be important diseases in National Hunt (NH) racehorses during racing, there are no accurate estimates of their incidence in NH training yards. Objectives: To estimate the incidence of fractures and tendon and suspensory ligament injuries (TLIs) in NH racehorses in training; to describe the injuries incurred and to compare injury incidence rates by horse age, trainer, gender and background (ex‐flat vs. ex‐store horses). Methods: Cohort data were collected from 14 UK NH training yards for 2 racing seasons. Daily exercise regimens and details of fractures and TLIs occurring in study horses were recorded. Results: Data were gathered from 1223 horses that spent 9466 months at risk of injury. The fracture incidence rate was 1.1/100 horse months and varied significantly by trainer (P<0.001) but not by gender, age or background. The pelvis and third metacarpal bone (MCIII) were the most common fracture sites, although this varied between racing and training. The TLI incidence rate was 1.9/100 horse months and varied significantly by trainer (P = 0.05) and age (P<0.001) but not by gender or background. However, exstore horses were significantly more likely to have a TLI on the racecourse than ex‐flat horses (P = 0.01). Superficial digital flexor injuries accounted for 89% of all TLIs, the remainder being suspensory ligament injuries. Conclusions and potential relevance: Fractures and TLIs are important causes of morbidity and mortality in NH racehorses in training in England. This study provides accurate estimates of their incidence in this population and provides a baseline against which to monitor the effect of future interventions.  相似文献