M eiosis sets the stage for sexual reproduction through a trifold and tightly choreographed dance: Chromosomes from the mother and father form pairs, exchange genetic material, and then separate from their partners. Geneticist R. Scott Hawley, who has studied these three steps for the better part of his career, has dubbed the sequence a “meiotic ballet.” Although the dance steps have been known...

•Orthodontists use rectangular wire retainers to prevent the development of active retainers.•This trial compares survival round twisted vs braided after 2 years.•Both retainer types showed comparable rates.•Periodontal health was good in patients wearing both types. IntroductionThe objective this study compare rates and periodontal with 3-strand (RT) 8-strand (RB) fixed bonded all 6 anterior t...

MHD in protostellar discs is modified by the Hall current when the ambipolar diffusion approximation breaks down. Here I examine the Balbus-Hawley (magnetorotational) instability of a weak, vertical magnetic field within a weakly-ionized disc. Vertical stratification is neglected, and a linear analysis is undertaken for the case that the wave vector of the perturbation is parallel to the magnet...

Let me preface this review with a confession: As an advocate of free trade, I love to link the 1930 Smoot-Hawley tariff bill with the Great Depression at every opportunity. More than 80 years after its passage, the bill still evokes negative feelings about protectionism. After reading Douglas Irwin’s Peddling Protectionism: SmootHawley and the Great Depression, I can see I need to curb my enthu...