Perth 2000 AGM date     

Bill Gee AM 《Australian veterinary journal》2000,78(3):141-141

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Synthesis of new tetronamides displaying inhibitory activity against bloom‐forming cyanobacteria     

Jaime AM Acosta  Milandip Karak  Luiz CA Barbosa  John Boukouvalas  Andrea Straforini  Giuseppe Forlani 《Pest management science》2020,76(2):779-788

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Giant Piezoelectric Effect in Strontium Titanate at Cryogenic Temperatures     

DE Grupp  AM Goldman 《Science (New York, N.Y.)》1997,276(5311):392-394

Piezoelectric materials have many applications at cryogenic temperatures. However, the piezoelectric response below 10 kelvin is diminished, making the use of these materials somewhat marginal. Results are presented on strontium titanate (SrTiO3), which exhibits a rapidly increasing piezoelectric response with decreasing temperature below 50 kelvin; the magnitude of its response around 1 kelvin is comparable to that of the best materials at room temperature. This "giant" piezoelectric response may open the way for a broad class of applications including use in ultralow-temperature scanning microscopies and in a magnetic field-insensitive thermometer. These observations, and the possible divergence of the mechanical response to electric fields at even lower temperatures, may arise from an apparent quantum critical point at absolute zero.  相似文献   

Ergodic theory, randomness, and "chaos"     

Ornstein DS 《Science (New York, N.Y.)》1989,243(4888):182-187

Ergodic theory is the theory of the long-term statistical behavior of dynamical systems. The baker's transformation is an object of ergodic theory that provides a paradigm for the possibility of deterministic chaos. It can now be shown that this connection is more than an analogy and that at some level of abstraction a large number of systems governed by Newton's laws are the same as the baker's transformation. Going to this level of abstraction helps to organize the possible kinds of random behavior. The theory also gives new concrete results. For example, one can show that the same process could be produced by a mechanism governed by Newton's laws or by a mechanism governed by coin tossing. It also gives a statistical analog of structural stability.  相似文献   

泸州荔枝果园AM真菌菌根及孢子数量调查与分析   总被引：1，自引：0，他引：1  

姜国金  许兰珍  杨晓红  王容春  朱邦松 《安徽农业科学》2007,35(22):6701-6702

[目的]对泸州荔枝园AM真菌进行调查,确认荔枝菌根类型,了解果园土壤中AM真菌孢子种群数量的大致情况。[方法]利用"湿筛法"和Phllips&Hayman的方法对3个泸州荔枝果园春季的土壤AM真菌进行了调查分析。[结果]荔枝菌根是内生菌根,共生真菌为囊泡——丛枝菌根真菌,即AM真菌。春季的菌根感染率在9%~32%之间,普遍低于25%。VA菌根感染率的平均值在15%~21%之间,低于25%。三个荔枝园每25 g土样中AM真菌孢子数平均值为869±76个。[结论]果园生草或对果园进行有机覆盖,是促进荔枝生长,增加荔枝果实产量,改善荔枝果实品质的一种绿色环保途径。  相似文献   

Local Control of Microdomain Orientation in Diblock Copolymer Thin Films with Electric Fields     

TL Morkved  M Lu  AM Urbas  EE Ehrichs  HM Jaeger  P Mansky  TP Russell 《Science (New York, N.Y.)》1996,273(5277):931-933

Local control of the domain orientation in diblock copolymer thin films can be obtained by the application of electric fields on micrometer-length scales. Thin films of an asymmetric polystyrene-polymethylmethacrylate diblock copolymer, with cylindrical polymethylmethacrylate microdomains, were spin-coated onto substrates previously patterned with planar electrodes. The substrates, 100-nanometer-thick silicon nitride membranes, allow direct observation of the electrodes and the copolymer domain structure by transmission electron microscopy. The cylinders aligned parallel to the electric field lines for fields exceeding 30 kilovolts per centimeter, after annealing at 250°C in an inert atmosphere for 24 hours. This technique could find application in nanostructure fabrication.  相似文献   

Amplification of acidic protease virulence gene (aprV2) in samples from footrot lesions did not help in diagnosis of clinical virulent footrot in affected sheep flocks in New South Wales     

AM Collins  BG Bowring 《Australian veterinary journal》2020,98(7):298-304

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Last occurrence and survival during winter of the arbovirus vector Culicoides brevitarsis at the southern limits of its distribution     

AL BISHOP  IM BARCHIA  AM HARRIS 《Australian veterinary journal》1995,72(2):53-55

SUMMARY: Linear regression analysis was used to describe the decline in numbers of Culicoides brevitarsis Kieffer into winter with monthly maximum, average and minimum temperatures at the southern limits to its distribution in New South Wales. From this, low temperature thresholds were derived when C brevitarsis would be absent from the field. The low minimum threshold ± 2 SE (95% Confidence Interval) of 8.1 ± 0.3°C was used with historical temperature data to estimate the last month that the species should occur (March to June) and the mean number of months (2 to 6.5) below the threshold at 17 selected sites. Probability for survival during winter at these sites was estimated from years when the number of consecutive months below the threshold was ≤ 2 months. This varied from zero to 51% depending on the location of the site. Last occurrence was 0.7 months later on average and absolute probabilities for survival ranged from zero to 100% when the temperatures were increased by an arbitrary 2°C.  相似文献   

Use of magnetic particles to improve the diagnosis of sheep-associated malignant catarrhal fever by polymerase chain reaction     

TM ELLIS  AM MASTERS 《Australian veterinary journal》1997,75(7):520-521

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Isolation of Nocardia mexicana from focal proliferative tenosynovitis and arthritis in a steer          下载免费PDF全文

H Owen  K Buckle  J Olm  M Leitner  S Pandey  JB Gaughan  ML Sullivan  AM Lees  JS Gibson 《Australian veterinary journal》2015,93(5):170-173

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