A food web in a chemostat is considered in which an arbitrary number of competitor populations compete for a single, essential, nonreproducing, growth-limiting substrate, and an arbitrary number of predator populations prey on some or all of the competitor populations. Although any number of predator populations may prey on the same competitor population, each predator population preys on only ...

AIM To quantify Toxoplasma gondii DNA using a specially constructed artificial template as competitor in a nested polymerase chain reaction (PCR). METHODS The diagnostic assay was a nested PCR employing four primers that amplify part of the single copy gene for the P30 major surface antigen in T gondii. An artificial competitor containing the four primer binding sites was made first by creati...

S uccessful business strategies are inherently dependent on the skills of the corporate strategist and the company management team's ability to implement the strategies. However, like the chef who is creating the epicurean meal, the strategist is also dependent on the ingredients that he has to work with-in essence, his strategy can be no better than the information from which it is derived. Th...

The Competitor Rule Suppression (CRS) effect is the performance impairment observed in task switching when the currently relevant task rule is the same rule that had generated a response conflict in the preceding trial. This effect could reflect (a) episodic tagging, in which a competitor rule is retrieved with relative difficulty in subsequent trials or (b) residual active inhibition of the co...

I investigated mechanisms of parasitoid coexistence in a spatially structured host–multiparasitoid community (harlequin bugs [Murgantia histrionica] and two specialist parasitoids [Trissolcus murgantiae and Ooencyrtus johnsonii ]). I tested both local and metapopulation hypotheses. The local hypothesis, intraguild predation, predicts coexistence if the inferior larval competitor is superior at ...