27 research outputs found
events at the Next Linear Collider: colour structure of top signal and irreducible background
We examine the colour structure and charged particle yield for both the signal and the irreducible background processes contributing to
\eebbww\ production close to the \ttb\ threshold. The charged particle
multiplicity for the various components of the cross section is computed as a
function of several kinematic variables. Our study may have important
implications for recently proposed studies of interconnection phenomena in
\ttb\ production at high--energy collidersComment: 14 pages, Latex, 8 figures uuencoded, complete ps file available via
anonymous ftp at:
ftp://axpc.hep.phy.cam.ac.uk/disk$alpha1:[public.hep9514]CAVENDISH_9514.ps
http://www.hep.phy.cam.ac.uk/theory/papers/index.htm
Rootâlesion nematodes of potato: current status of diagnostics, pathogenicity and management
Rootâlesion nematodes of the genus Pratylenchus are migratory endoparasites with worldwide economic impact on several important crops including potato, where certain species like P. penetrans, P. neglectus and P. scribneri reduce the yield and quality of potato tubers. Morphological identification of Pratylenchus spp. is challenging, and recent advancements in molecular techniques provide robust and rapid diagnostics to differentiate species without need of specialist skills. However, the fact that molecular diagnostics are not available for all Pratylenchus species means that there are limitations in worldwide application. In general, rootâlesion nematodes are difficult to manage once introduced into agricultural land and damage can be related to pathogenicity and population densities. In addition, rootâlesion nematodes interact with fungi such as V. dahliae, resulting in disease complexes that enhance the damage inflicted on the potato crop. Management interventions are often focused on limiting nematode reproduction before planting crops and include the application of nematicides, and cultural practices such as crop rotation, cover crops, biofumigation, and biological control. Understanding the limitations of the available crop protection strategies is important and there are many gaps for further study. This review discusses the status of the diagnosis, distribution, pathogenicity and management of the main species of rootâlesion nematodes, reported to infect potatoes worldwide, and highlights areas for potential future research
A study of two new recycle systems with a view to assessing their suitability for commercial hatchery operations
Available from British Library Lending Division - LD:D55625/85 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
AnĂĄlise de crescimento e trocas gasosas na cultura de milho em plantio direto e convencional
Production of leucinostatins and nematicidal activity of Australian isolates of Paecilomyces lilacinus (Thom) Samson
Factors responsible for performance on the day-night task: response set or semantics?
In a recent study Diamond, Kirkham and Amso (2002) obtained evidence consistent with the claim that the day-night task requires inhibition because the picture and its corresponding conflicting response are semantically related. In their study children responded more accurately in a dog-pig condition (see /day picture/ say "dog"; see /night picture/ say "pig") than the standard day-night condition (see /day picture/ say "night"; see /night picture/ say "day"). However, there is another effect that may have made the day-night condition harder than the dog-pig condition: the response set effect. In the day-night condition the names of the two stimuli ("day" and "night") and the two corresponding conflicting responses ("night" and "day") are from the same response set: both "day" and "night". In the dog-pig condition the names of the stimuli ("day", "night") and the corresponding responses ("dog", "pig") are from a different response set. In two experiments (Experiment 1 with 4-year-olds (n = 25); Experiment 2 with , 4-, 5-, 7- and 11-year-olds (n = 81)) children were tested on four experimental conditions that enabled the effects of semantics and response set to be separated. Overall, our data suggest that response set is a major factor in creating the inhibitory demands of the day-night task in children of all ages. Results are discussed in relation to other inhibitory tasks