The distribution of Galactic-disk wide binaries shows a clear break in slope at projected separations of about r ⊥ ∼ 2500 AU in two basically independent surveys by Chanamé & Gould and Lépine & Bongiorno. The latter also showed that the frequency of wide-binary companions to G-star primaries declines mono-tonically as a function of companion mass. We show that both effects can be explained by t...

INTRODUCTION Peroxisomes are vital cellular organelles controlling important metabolic functions like hydrogen peroxide degradation, fatty acid metabolism, gluconeogenesis, toxin degradation, etc. (Flatmark et al., 1988; van den Bosch et al., 1992; Masters, 1997; Lopez-Huertas et al., 2000). Certain human metabolic disorders such as Zellweger syndrome, neonatal adrenoleukodystrophy, infantile R...

Una nueva especie de mosca blanca, Aleuropleurocelus popocatepetl Carapia-Ruizy Sánchez-Flores sp. nov., se describe del Estado Morelos, México. Se recolectó sobre lashojas la gramínea Dichanthelium dichotomum (L.) Gould (Poaceae) en Ocuituco, Morelos.Se incluyen microfotografías las estructuras morfológicas los puparios. discuten lasdiferencias con especies cercanas.

the National Foundation and that only in the 1960s, when it began to accept federal funding, was it forced to admit African-American patients and care-givers. In his analysis of the British Polio Fellowship, founded in 1939, which he defines as "an organization of the disabled run by the disabled themselves" (p. 165), Gould points out the frequent tensions between the disabled and the able-bodi...

As part of an effort to associate the unidentified EGRET γ-ray sources with pulsars, error boxes for 19 sources were searched using Arecibo at 327-MHz. The sources were chosen to be out-of-plane and possibly associated with the Gould belt, a nearby starburst region with an enhanced production rate of core-collapse supernovae. The search revealed one new 597-ms pulsar, J2243+1518, within the err...

Most scientists take ethical arguments for conservation as given and focus on scientific or economic questions. Although nature conservation is often considered a just cause, it is given little further consideration. A lack of attention to ethical theory raises serious concerns for how conservation scientists conceive and practice ethics. I contrast two common ways scientists approach ethics, a...

Palaeontologists, Stephen J. Gould and Elisabeth Vrba, introduced the term “ex-aptation” with the aim of improving and enlarging the scientific language available to researchers studying the evolution of any useful character, instead of calling it an “adaptation” by default, coming up with what Gould named an “extended taxonomy of fitness” . With the extension to functional co-optations from no...

Lewis et al. (2011) attempted to restore the reputation of Samuel George Morton, a 19th century physician who reported on the skull sizes of different folk-races. Whereas Gould (1978) claimed that Morton's conclusions were invalid because they reflected unconscious bias, Lewis et al. alleged that Morton's findings were, in fact, supported, and Gould's analysis biased. We take strong exception t...

The historical biogeography of freshwater fish helminth parasites is linked to speciation. It is well recognized and documented that bursts of speciation are often limited to certain periods of geological time (Eldredge & Gould 1972; Gould & Eldredge; 1977, Gould, 2002; Hoberg & Brooks, 2008) and is highly dependent on the space in which it occurs (Brooks & McLennan, 2002; Hoberg & Brooks, 2008...

providing such a panoramic view of the practice of teaching to distance learners, Niedorf must discuss many of these topics only lightly. I was often left wishing that Niedorf would offer more than a cursory analysis and go deeper into the subject matter. For that reason, I think the book would be of greatest use to those who are brand-new to the practice of teaching distance students. They sho...