The Ursinus Weekly, April 19, 1943

Judges chose girls to portray roles in May pageant • Thespians to give two Barrie plays • Dean Steward will head men\u27s council; Mildred Halbruegge wins WAA election • College will return stamps for Easter • Y officers installed at vespers service • Medical relief group asks students for biology kits • Lenten speaker interprets Jesus\u27 dreams as universal • Ursinus TKA cancels debating conference • Choir and Y\u27s present Easter service tonight • Dr. Theo. Herman speaks to brotherhood of St. Paul • Women debates accept twelve new members • France forever movement represents upholders of nation\u27s pre-war spirit • Students under 21 need parents\u27 ok to give blood • Exchanges placed in library • Penn dean to speak here • Softball tilts begin for dorm players • Spring season starts for women\u27s sports with varied program • Attention, girls!! • Men line up baseball teams to determine class champs • Girls lost only two tennis matches in last six years of intercollegiates • Norwegian girl tells startling story of life in Europe under Nazi heel • Beardwood elects officers • Dr. White reviews book • Music Club now organizing Y sing booklet of 53 songs • German Club plans social • Hope Le Bar Roberts talks at AAUW meeting April 14 • Airplane spotter to speak • Robert Tredinnick becomes new president of IRC • Joyce Behler leads dancing at French Club meetinghttps://digitalcommons.ursinus.edu/weekly/1761/thumbnail.jp

Factors affecting the behavior of selected disperse dyes under high temperature dyeing conditions

The major purpose of this study was to investigate the changes in dyeing behavior of selected disperse dyes resulting from variations in the conditions under which the dyes were used. The variations introduced into the dyeing system were: variations in pH; variations in dyeing times at the top temperature; and variations in the surfactant used. The procedure used to make the dyeings was chosen because it would subject the dyes to severe conditions which would aid in differentiating among the various dyes and dyeing conditions by magnifying any potential instability of a given dyeing system. The procedure consisted of conducting dyeings of each of the fifteen dyes chosen for the study under four conditions. Each of these four conditions was further divided into dyeings held at varying times at the top temperature of 265° F (130° C). Filter tests were conducted on blank dyebaths which were held at the top temperature without fabric for three hours for examination of particle size change. Ratings of the depth of shade of the dyed swatches were done visually and by spectrophotometer. A change in the depth of shade was considered an indication of a change in the dyeing properties of the dye. Ratings of the filter tests were done visually only. Variations in ratings on these tests gave a good indication of the dyeing properties of the dye under the various conditions

Random Convex Hulls and Extreme Value Statistics

In this paper we study the statistical properties of convex hulls of $N$ random points in a plane chosen according to a given distribution. The points may be chosen independently or they may be correlated. After a non-exhaustive survey of the somewhat sporadic literature and diverse methods used in the random convex hull problem, we present a unifying approach, based on the notion of support function of a closed curve and the associated Cauchy's formulae, that allows us to compute exactly the mean perimeter and the mean area enclosed by the convex polygon both in case of independent as well as correlated points. Our method demonstrates a beautiful link between the random convex hull problem and the subject of extreme value statistics. As an example of correlated points, we study here in detail the case when the points represent the vertices of $n$ independent random walks. In the continuum time limit this reduces to $n$ independent planar Brownian trajectories for which we compute exactly, for all $n$, the mean perimeter and the mean area of their global convex hull. Our results have relevant applications in ecology in estimating the home range of a herd of animals. Some of these results were announced recently in a short communication [Phys. Rev. Lett. {\bf 103}, 140602 (2009)].Comment: 61 pages (pedagogical review); invited contribution to the special issue of J. Stat. Phys. celebrating the 50 years of Yeshiba/Rutgers meeting

Control of intestinal stem cell function and proliferation by mitochondrial pyruvate metabolism.

Most differentiated cells convert glucose to pyruvate in the cytosol through glycolysis, followed by pyruvate oxidation in the mitochondria. These processes are linked by the mitochondrial pyruvate carrier (MPC), which is required for efficient mitochondrial pyruvate uptake. In contrast, proliferative cells, including many cancer and stem cells, perform glycolysis robustly but limit fractional mitochondrial pyruvate oxidation. We sought to understand the role this transition from glycolysis to pyruvate oxidation plays in stem cell maintenance and differentiation. Loss of the MPC in Lgr5-EGFP-positive stem cells, or treatment of intestinal organoids with an MPC inhibitor, increases proliferation and expands the stem cell compartment. Similarly, genetic deletion of the MPC in Drosophila intestinal stem cells also increases proliferation, whereas MPC overexpression suppresses stem cell proliferation. These data demonstrate that limiting mitochondrial pyruvate metabolism is necessary and sufficient to maintain the proliferation of intestinal stem cells

Comparison of Aromatic Dithiophoshinic and Phosphinic Acid Derivatives for Minor Actinide Extraction

A new extractant for the separation of actinide(III) and lanthanide(III), bis(otrifluoromethylphenyl) phosphinic acid (O-PA) was synthesized. The synthetic route employed mirrors one that was employed to produce the sulfur containing analog bis(otrifluoromethylphenyl) dithiophosphinic acid (S-PA). Multinuclear NMR spectroscopy was used for elementary characterization of the new O-PA derivative. This new O-PA extractant was used to perform Am(III)/Eu(III) separations and the results were directly compared to those obtained in identical separation experiments using S-PA, an extractant that is known to exhibit separation factors of ~100,000 at low pH. The separations data are presented and discussed in terms comparing the nature of the oxygen atom as a donor to that of the sulfur atom in extractants that are otherwise identical