The Effects of Temperature and Leaf Sugar Content on the Electrical Conductance of Strawberry Leaf Exudates

Once considered to be the inevitable fate of plant life exposed to low temperatures, plant injury is now subject to partial control or alteration under certain conditions. These conditions involve a genetic change in the plant protoplasm by breeding a hardier, more resistant variety or by a change in the environment of the plant that induces resistance to low temperatures. The latter change is frequently known as “hardening” of the plant. While the study of these changes has given considerable insight into the subject, there is little understanding of the basic cause or causes of frost injury, nor is the subsequent resolution of the problem known. The bulk of recent scientific investigations into winter injury has been mainly concerned with plant physiology. The detection of measurable differences in the physiological factors under various conditions has offered a means of explaining frost resistance, at least partially. This thesis is a report of a continuation of an investigation into this aspect of the problem. Strawberries were selected for this research because of their susceptibility to frost injury, comparative ease of control for research purposes, and practical significance as a crop in this area. Previous studies at this college have revealed the desirability of applying a protective mulch when the plants have reached a maximum level of stored carbohydrate reserve as determined by sugar analysis. Investigations elsewhere with various plant materials have indicated that numerous other factors including mineral content and permeability of the cell, are involved. The objective of this study then is to examine some of these factors with particular reference to the strawberry plant

Did You Not Understand The Question Or Not? An Investigation Of Negatively Worded Questions In Survey Research

This study compared participant responses to negatively versus positively worded questionnaire statements.  The literature suggested that one could expect the wording of questionnaire items (i.e., negatively worded vs. positively worded) to influence participant responses to those scale items.  The study consisted of one control group and two experimental groups.   The Fashion Consciousness scale (Wilkes 1992;  Lumpkin and Darden 1982), a uni-dimensional, all-positive seven-item instrument was adapted for use in the study.  Three hypotheses regarding the factor structure and internal reliability of the scale were empirically investigated.  Results showed statistically significant differences in the psychometrics of the scale when negative or double negative wording was added to scale items.  Managerial implications are discussed

The Ursinus Weekly, April 20, 1967

Artist team opens show • Meistersingers tour, sweep New England • College Bowl contest welcomes UC team • Students, faculty combine efforts • Betsy Miller wins Miss Mont. Co. title • Showboat on Delaware, juniors sponsor voyage • Genuine carnival concludes Campus Chest activities • Editorial • Endless policy changes harass concessionaires • Letters to the editor • Fuse complicates Happening; Audience reactions electric • Students devote time to retarded children • UC coeds cop curfew change constitutionally • Losing\u27s too easy for tennis team • Girls\u27 softball win features long ball • Shuman leads baseball team to three early season wins • Trackmen shatter Marks, edge Swarthmore, 72-68 • Netmen outclassed in lopsided defeat • Girls\u27 tennis team suffers double loss • Youthful Crossettes outhustle Penn, 8-1 • Greek gleanings • Campus best-sellershttps://digitalcommons.ursinus.edu/weekly/1200/thumbnail.jp

Short-line railroad managers discuss class I railroads

Managers/owners of short-line railroads were queried about three issues: (1) How would you describe your company’s business relationship with the Class I railroad(s) with which you interchange traffic; (2) Do you believe that mergers between Class I railroads have been good or bad for short-line railroads; and (3) Besides merger activity, what do you believe will be the most important trend for Class I railroads in the next 10 years

Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer

We present a sample of brown dwarfs identified with the {\it Wide-field Infrared Survey Explorer} (WISE) for which we have obtained {\it Hubble Space Telescope} ({\it HST}) Wide Field Camera 3 (WFC3) near-infrared grism spectroscopy. The sample (twenty-two in total) was observed with the G141 grism covering 1.10$-$1.70 $\mu$m, while fifteen were also observed with the G102 grism, which covers 0.90$-$1.10 $\mu$m. The additional wavelength coverage provided by the G102 grism allows us to 1) search for spectroscopic features predicted to emerge at low effective temperatures (e.g.\ ammonia bands) and 2) construct a smooth spectral sequence across the T/Y boundary. We find no evidence of absorption due to ammonia in the G102 spectra. Six of these brown dwarfs are new discoveries, three of which are found to have spectral types of T8 or T9. The remaining three, WISE J082507.35$+$280548.5 (Y0.5), WISE J120604.38$+$840110.6 (Y0), and WISE J235402.77$+$024015.0 (Y1) are the nineteenth, twentieth, and twenty-first spectroscopically confirmed Y dwarfs to date. We also present {\it HST} grism spectroscopy and reevaluate the spectral types of five brown dwarfs for which spectral types have been determined previously using other instruments.Comment: Accepted for publication in the Astrophysical Journal. 20 pages, 18 figures, 7 table

Dipole-phonon quantum logic with alkaline-earth monoxide and monosulfide cations

Dipole-phonon quantum logic (DPQL) leverages the interaction between polar molecular ions and the motional modes of a trapped-ion Coulomb crystal to provide a potentially scalable route to quantum information science. Here, we study a class of candidate molecular ions for DPQL, the cationic alkaline-earth monoxides and monosulfides, which possess suitable structure for DPQL and can be produced in existing atomic ion experiments with little additional complexity. We present calculations of DPQL operations for one of these molecules, CaO$^+$, and discuss progress towards experimental realization. We also further develop the theory of DPQL to include state preparation and measurement and entanglement of multiple molecular ions.Comment: 10 pages, 6 figure

TSS-1R Mission Failure Investigation Board

Reasons for the tether separation during the Tethered Satellite System (TSS-1) Mission are investigated. Lessons learned are presented

Survey of International Space Station Charging Events

With the negative grounding of the 160V Photovoltaic (PV) arrays, the International Space Station (ISS) can experience varied and interesting charging events. Since August 2006, there has been a multi-probe p ackage, called the Floating Potential Measurement Unit (FPMU), availa ble to provide redundant measurements of the floating potential of th e ISS as well as the density and temperature of the local plasma environment. The FPMU has been operated during intermittent data campaigns since August 2006 and has collected over 160 days of information reg arding the charging of the ISS as it has progressed in configuration from one to three PV arrays and with various additional modules such as the European Space Agency?s Columbus laboratory and the Japan Aeros pace Exploration Agency's Kibo laboratory. This paper summarizes the charging of the ISS and the local environmental conditions that contr ibute to those charging events, both as measured by the FPMU