Johannes Holtfreter [6] made important discoveries about the properties of the organizer [7] discovered by Hans Spemann [8]. Although he spent much time away from the lab over many years, he was a productive researcher. His colleagues noted that the time he spent away helped revitalize his ideas. He is credited with the development of a balanced salt medium to allow embryos to develop; the disc...

Attempts at Cloning the Rat Mesangial Cell Na+-Dependent and Na+-Independent Cl--HCO3Exchange Proteins Based Upon DNA Homology to the Chloride-Bicarbonate Exchange Protein AE-1 (Band 3): Identification and Sequence of a Unique 1.7 kb Partial-Length cDNA Clone. Ahmed M. Abou-Zamzam, Bruce A. Davis,b William C. Summers,a and Walter F. Boron.b aDepartment of Therapeutic Radiology, and bDepartment ...

This document discusses the ergonomic problems with currently available software products, and what in general is necessary in order to make an application pleasant to work with. The application of these principles to a new open-architecture user interface system, Views, is then described. 1991 Mathematics Subject Classification: 68U99. 1991 CR Categories: H.1.2, H.5.2, D39, H.5.0, I.7.2.

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A recently established colony of the ichneumonid parasitoid, Hyposoter exiguae, was found to carry both a reovirus (HeRV) and a polydnavirus (HePDV). Morphogenesis of these viruses was observed in all cells comprising the ovarian calyx epithelium, apparently without detrimental effect to the parasitoid. While polydnavirus replication in H. exiguae was restricted to the calyx region, HeRV was de...