We have developed a simple gene quantification system using the competitive polymerase chain reaction (CPCR) followed by microtiter format analysis. CPCR is carried out using a mutant competitor with the same size as the target DNA product, and a minimal base exchange to insure the same amplification kinetics. One primer is aminated at the 5' end to produce PCR products that are captured onto c...

Caching food is an economic, decision-making process that requires animals to take many factors into account, including the risk of pilferage. However, little is known about how food-storing animals determine the risk of pilferage. In this study, the authors examined the effect of a dominant competitor species on the caching and behavior of Merriam's kangaroo rat (Dipodomys merriami). The autho...

A bidder is said to be advantaged if she has a higher expected valuation of the auction prize than her competitor. When the prize has a common-value component, a bidder competing in an ascending auction against an advantaged competitor bids especially cautiously and, hence, the advantaged bidder wins most of the time. However, contrary to what is often argued, a disadvantaged bidder still wins ...

Prior research demonstrates product market advantages of organizational status but largely neglects factor market advantages. We propose that status is advantageous in labor markets because individuals generally consider employer status a non-pecuniary employment benefit. Dyadic analyses of lateral partner hiring by large U.S. law firms demonstrate two status-based advantages in employee hiring...

Sympatric divergence in traits affecting species recognition can result from selection against cross-species mating (reproductive character displacement, RCD) or interspecific aggression (agonistic character displacement, ACD). When the same traits are used for species recognition in both contexts, empirically disentangling the relative contributions of RCD and ACD to observed character shifts ...

Although hearing loss accounts for much of the difficulty older adults have comprehending spoken language, cognitive factors also play a role. There is evidence that, relative to younger listeners, older listeners have more difficulty recognizing a word when it has many lexical competitors, but little is known about the time course of lexical competition in older adults. We monitored the eye mo...

DNA fragments used as standards in competitive PCR were precisely calibrated using HPLC and commercially available DNA molecular mass markers. The accuracy of calibration was reflected by data that differed by only 2% from the mean when two independently purified and calibrated competitor preparations were compared. Highly dilute competitor solutions were stable at -20 degrees C for up to 1 yea...