Article history: Received 4 August 2011 Available online 11 November 2013

If a discrete subset S of a topological group G with the identity 1 generates a dense subgroup of G and S ∪ {1} is closed in G, then S is called a suitable set for G. We apply Michael’s selection theorem to offer a direct, self-contained, purely topological proof of the result of Hofmann and Morris [8] on the existence of suitable sets in locally compact groups. Our approach uses only elementar...

MR0044509 (13,427c) 09.0X Artin, Emil; Tate, John T. A note on finite ring extensions. J. Math. Soc. Japan 3 (1951), 74–77. Let R and S be two commutative rings, R ⊆ S. Then S is called a modulefinite extension of R, if it is an R-module with a finite set of generators, that is, if there exists a finite number of elements of S such that every element of S can be represented as a linear combinat...

Tournament solution concepts, selecting winners based on a pairwise dominance relation are an important structure often used in sports, as well as elections, and argumentation theory. Manipulation of such choice rules by coalitions of agents are a significant problem in most common rules. We deal with the problem of the manipulation of randomized choice rules by coalitions varying from a single...

Chlamydia trachomatis; infection; heat shock proteins hronic chlamydial infections have been documented in numerous works 1,z as silently evolving diseases. Evidence of resistance to antibiotic therapy, as demonstrated by positive cultures long after treatment in infertile women, 3,4 as well as positive chlamydial antigens or nucleic acids in culture-negative pelvic samples of infertile women s...

Background: An important mechanism for gene regulation utilizes small non-coding RNAs called microRNAs (miRNAs). These small RNAs play important roles in tissue development, cell differentiation and proliferation, lipid and fat metabolism, stem cells, exocytosis, diseases and cancers. To date, relatively little is known about functions of miRNAs in the lung except lung cancer. Results: In this ...

A growing body of scientific evidence suggests there may be an association between parents' exposure to pesticides and cancer in their children. In this issue, Kori Flower of the University of North Carolina–Chapel Hill School of Public Health and colleagues report the results of their recent study investigating the possibility of increased cancer risk among the children of pesticide applicator...