Simulation of the economic impact of proliferative enteritis on pig production in Australia   总被引：2，自引：0，他引：2  

PK HOLYOAKE  BP MULLAN†  RS CUTLER 《Australian veterinary journal》1996,73(3):89-92

The economic impact of proliferative enteritis (PE) on an ‘average’ pig farm was calculated using the AUSPIG decision support system. Inputs were modelled on actual cases of PE, in which affected herds suffered from depressed growth rate, decreased feed efficiency and stock losses. The costs associated with non-haemorrhagic PE and proliferative haemorrhagic enteropathy ranged from $15/sow/yr to $141/sow/yr, respectively, depending on the clinical severity of the disease, incidence of infection and the type of medication strategy used to treat and control the disease.  相似文献   

THE REACTION OF INDIVIDUAL BACTERIA TO IRRADIATION WITH ULTRAVIOLET LIGHT     

Gates FL 《Science (New York, N.Y.)》1933,77(1997):350-351

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Laser guide star adaptive optics imaging polarimetry of Herbig Ae/Be stars     

Perrin MD  Graham JR  Kalas P  Lloyd JP  Max CE  Gavel DT  Pennington DM  Gates EL 《Science (New York, N.Y.)》2004,303(5662):1345-1348

We have used laser guide star adaptive optics and a near-infrared dual-channel imaging polarimeter to observe light scattered in the circumstellar environment of Herbig Ae/Be stars on scales of 100 to 300 astronomical units. We revealed a strongly polarized, biconical nebula 10 arc seconds (6000 astronomical units) in diameter around the star LkHalpha 198 and also observed a polarized jet-like feature associated with the deeply embedded source LkHalpha 198-IR. The star LkHalpha 233 presents a narrow, unpolarized dark lane consistent with an optically thick circumstellar disk blocking our direct view of the star. These data show that the lower-mass T Tauri and intermediate mass Herbig Ae/Be stars share a common evolutionary sequence.  相似文献   

A FIXING FLUID FOR PLANT TISSUES     

Gates RR 《Science (New York, N.Y.)》1910,31(789):234-235

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Activation of Zona‐Free Buffalo (Bubalus bubalis) Oocytes by Chemical or Electrical stimulation,and Subsequent Parthenogenetic Embryo Development     

A George  RA Shah  R Sharma  P Palta  SK Singla  RS Manik  MS Chauhan 《Reproduction in domestic animals》2011,46(3):444-447

Parthenogenetic activation using zona‐free oocytes offers an alternative model that could be applied to develop protocols for the activation of reconstructed embryos for cloning. The aim of this study was to compare the efficacy of different methods for the activation of zona‐free buffalo oocytes in terms of their effects on the developmental competence of parthenogenetic embryos. The effects of zona removal on parthenogenetic activation and in vitro developmental competence of metaphase II oocytes were also examined. All activation methods were followed by incubation of 2 mm 6‐dimethylaminopurine (6‐DMAP) for 4 h. Out of three different pulse strengths (1.2, 2.1 or 3.3 kV/cm) used, 2.1 kV/cm resulted in the highest blastocyst rate (25.3%). On comparing different chemical agents and electric pulse, highest blastocyst rate was observed for calcium ionophore (CaI) (28.6%) followed by ethanol (25.0%), electric pulse (22.5%) and combined CaI and ethanol treatment (16.7%) although differences among them were not significant. Furthermore, a significantly reduced developmental potential was observed in zona‐free oocytes when compared to zona‐intact ones up to the blastocyst stage (44.3% vs 27.1%). In conclusion, zona‐free buffalo oocytes can be successfully activated for parthenogenetic development using chemical or electrical stimulation. Out of different agents examined, CaI followed by 6‐DMAP resulted in the highest blastocyst rate.  相似文献   

HEMERARCH AND FERALARCH,TWO ADDITIONAL TERMS IN ECOLOGY     

Gates FC 《Science (New York, N.Y.)》1925,61(1575):260-261

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PROCESSES OF ORGANIC EVOLUTION     

Gates RR 《Science (New York, N.Y.)》1941,93(2415):335-339

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Spectral Distribution of Solar Radiation at the Earth's Surface     

Gates DM 《Science (New York, N.Y.)》1966,151(3710):523-529

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Leaf temperatures of desert plants   总被引：5，自引：0，他引：5  

D M Gates  R Alderfer  E Taylor 《Science (New York, N.Y.)》1968,159(818):994-995

Temperatures of small leaves of many desert plants are within 3 degrees C of air temperature in contrast to the temperature of Opuntia in the same locale; this plant has a temperature 10 degrees to 16 degrees C above air temperature. Theoretical4 justification for the observation is given based on an energy budget analysis.  相似文献   

Medicine. Consent from donors for embryo and stem cell research     

Lo B  Chou V  Cedars MI  Gates E  Taylor RN  Wagner RM  Wolf L  Yamamoto KR 《Science (New York, N.Y.)》2003,301(5635):921

As research with human embryos and embryonic stem cells proceeds, the authors of this Policy Forum argue that all donors of biological materials should give informed consent, including oocyte and sperm donors. Informed consent is particularly important because of the diverse opinions and strong emotions that surround such research. Some gamete donors who are willing to help women and couples bear children may object to the use of their genetic materials for certain types of research.  相似文献