The effect of leaf area and crop level on the concentration of amino acids and total nitrogen in 'Thompson Seedless' grapes

20 to 50% of the leaves and 25 to 75% of the clusters on 'Thompson Seedless' vines were removed 12 to 16 days after anthesis. In addition, 25 and 50% of the   leaves on other vines were removed 35 and 58 days after anthesis, with no cluster thinning.Total soluble solids in fruits from vines with less than 5 cm2 of leaf surface per gram of fruits was markedly reduced, while concentration in fruits from vines with a ratio above 10 was considerably higher, compared to the concentration in fruits from vines with ratios intermediate between these two values. The concentrations of arginine, proline, total free amino acids, and total N in berry juice were greatly increased by reducing the crop load. Also, the concentration of each of these substances increased during fruit ripening.A significant correlation between leaf area per vine and level of arginine in the juice was obtained. The concentration of proline in the juice was highly correlated with fruit maturity (°B) and with leaf area per unit weight of fruits. Total nitrogen was also correlated with leaf area per unit weight of fruits. Between 4 and 12 cm2 leaf area per gram of fruits there was a linear increase in the concentration of proline and total nitrogen in berry juice, while above 12 cm2 there was generally little further increase in the level of these substances. The ratio of arginine to proline decreased with fruit maturity and with smaller crop weights per vine. Total free amino acids accounted for 64 to 75% of the total nitrogen in the juice of grapes during the fruit-ripening period. Defoliation within 16 days after anthesis reduced crop yields, while later defoliations did not significantly reduce yields

Conventional and manipulated growth of Cu-Cu(111)

Molecular beam epitaxy of Cu on Cu(111) was studied using thermal energy He scattering, in the temperature range between 100 and 450 K. Three-dimensional growth was observed in the whole temperature range. To determine the onset of various diffusion processes, submonolayer films formed by deposition at low temperature were annealed. Annealing proceeds in two steps. The first step is interpreted as a change in island shape, the second as Ostwald-ripening. A comparison with homoepitaxy on Pt(111) and Ag(111) is made. Growth manipulation was carried out by artificially increasing the island number density via intervention in the nucleation stage of each layer. The procedures applied were temperature reduction during nucleation as well as pulsed ion bombardment. These techniques enabled the convenient growth of good quality films consisting of a large number of monolayers. Finally, the use of oxygen as a surfactant modifying the growth mode was investigated. Under some growth conditions, pre-exposure of the surface to oxygen was found to induce weak He-intensity oscillations during deposition. The quality of the films grown in this way was, however, low

Differentiating Sleep Problems Most Related to Depression and Anxiety in College Students

Sleep problems, anxiety and depression are common amongst college students. Researchers examined the specific sleep problems correlated with anxiety and depression. These sleep problems included sleep duration, sleep disturbances, sleep latency, daytime dysfunction, habitual sleep efficiency, overall sleep quality, and use of sleep medication. Researchers predicted that daytime dysfunction was the most important sleep problem related to greater anxiety symptoms, followed by overall quality of sleep, and sleep duration. Meanwhile, it was also predicted that daytime dysfunction would be the most important sleep problem and sleep latency the second most important sleep problem related to greater depressive symptoms. The study consisted of 561 undergraduate students (55% White, 69.9% female). Two multiple regression analyses were conducted. The first examined the most pertinent sleep problems related to greater anxiety symptoms in college students. The seven sleep problems described above were simultaneously entered into the model. The overall model showed significantly greater anxiety symptoms, F(7, 513) = 19.19, p \u3c .05. Together, these sleep problems accounted for 20.7% of the variance in greater anxiety symptoms. Daytime dysfunction due to sleepiness was the most strongly related to greater anxiety symptoms t(513) = 6.25, p \u3c .05, followed by overall sleep quality, t(513) = 2.27, p \u3c .05, followed by habitual sleep efficiency, t(513) = 2.26, p \u3c .05. The second multiple regression analysis was conducted to examine the relationship between sleep problems and depression symptoms. The same sleep problems were simultaneously entered into the model. The overall model showed the sleep problems significantly predicted depressive symptoms, F(7, 512) = 34.89, p \u3c .001. Together, these sleep problems accounted for 32.3% of the variance in depression symptoms. In order of importance, sleep duration, t(512) = 2.84, p \u3c .05, sleep disturbances, t(512) = 3.82, p \u3c .001, daytime dysfunction due to sleepiness, t(512) = 8.90, p \u3c .001, and overall sleep quality, t(512) = 2.14, p \u3c .05, were all significantly related to depression symptoms. These findings suggest that for individuals with anxiety or depressive symptoms targeting treatments that focus on daytime dysfunction and overall sleep quality may lead to a reduction in these symptoms. Additionally, specific to anxiety, we should focus on ameliorating habitual sleep efficiency by improving the amount of sleep individuals consistently receive. Conversely, in relation to depressive symptoms, future work should focus on increasing the amount of time people sleep and decreasing how much people awake while they are sleeping.https://scholarscompass.vcu.edu/uresposters/1183/thumbnail.jp

Statistical mechanical aspects of joint source-channel coding

An MN-Gallager Code over Galois fields, $q$, based on the Dynamical Block Posterior probabilities (DBP) for messages with a given set of autocorrelations is presented with the following main results: (a) for a binary symmetric channel the threshold, $f_c$, is extrapolated for infinite messages using the scaling relation for the median convergence time, $t_{med} \propto 1/(f_c-f)$; (b) a degradation in the threshold is observed as the correlations are enhanced; (c) for a given set of autocorrelations the performance is enhanced as $q$ is increased; (d) the efficiency of the DBP joint source-channel coding is slightly better than the standard gzip compression method; (e) for a given entropy, the performance of the DBP algorithm is a function of the decay of the correlation function over large distances.Comment: 6 page

Role of elastic scattering in electron dynamics at ordered alkali overlayers on Cu(111)

Scanning tunneling spectroscopy of p(2x2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi two-dimensional quantum well states despite largely different binding energies. Detailed calculations show that 50% of the line widths are due to electron-phonon scattering while inelastic electron-electron scattering is negligible. A frequently ignored mechanism for ordered structures, i.e., enhanced elastic scattering due to Brillouin zone back folding, contributes the remaining width.Comment: 4 pages, 2 figures, 1 tabl

Electromagnetic field correlations near a surface with a nonlocal optical response

The coherence length of the thermal electromagnetic field near a planar surface has a minimum value related to the nonlocal dielectric response of the material. We perform two model calculations of the electric energy density and the field's degree of spatial coherence. Above a polar crystal, the lattice constant gives the minimum coherence length. It also gives the upper limit to the near field energy density, cutting off its $1/z^3$ divergence. Near an electron plasma described by the semiclassical Lindhard dielectric function, the corresponding length scale is fixed by plasma screening to the Thomas-Fermi length. The electron mean free path, however, sets a larger scale where significant deviations from the local description are visible.Comment: 15 pages, 7 figure files (.eps), \documentclass[global]{svjour}, accepted in special issue "Optics on the Nanoscale" (Applied Physics B, eds. V. Shalaev and F. Tr\"ager

Direct measurement of S-branch N(2)-H(2) Raman linewidths using time-resolved pure rotational coherent anti-Stokes Raman spectroscopy.

S-branch N(2)-H(2) Raman linewidths have been measured in the temperature region 294-1466 K using time-resolved dual-broadband picosecond pure rotational coherent anti-Stokes Raman spectroscopy (RCARS). Data are extracted by mapping the dephasing rates of the CARS signal temporal decay. The J-dependent coherence decays are detected in the time domain by following the individual spectral lines as a function of probe delay. The linewidth data set was employed in spectral fits of N(2) RCARS spectra recorded in binary mixtures of N(2) and H(2) at calibrated temperature conditions up to 661 K using a standard nanosecond RCARS setup. In this region, the set shows a deviation of less than 2% in comparison with thermocouples. The results provide useful knowledge for the applicability of N(2) CARS thermometry on the fuel-side of H(2) diffusion flames

Trapping of Metal Atoms and Metal Clusters by Chabazite under Severe Redox Stress

[EN] The remarkable ability of Al-containing CHA zeolite to trap and stabilize noble single-metal atoms and metal clusters has facilitated the design of sinter-resistant materials for catalytic applications that require severe reaction conditions. At high temperatures in O-2, volatile MOx species appear to be fixated by the zeolite Al centers to prevent Ostwald-ripening sintering mechanisms, whereas small metal clusters (<100 atoms) are stabilized in H-2 without further aggregation as coalescence by Brownian motion is inhibited because of an encapsulation effect. Evidences of the possibility to trap the metal released from a second adjacent surface (e.g., SiO2 and Al2O3), upon metal migration over micrometer distances, are provided. These properties have opened the possibility to prepare several noble-metal atoms and clusters inside small-pore zeolites, including bimetallic formulation, by simple wetness impregnations or solid-to-solid transformations followed by standard calcination procedures, resulting in improved catalytic performances compared to other nonreducible supports in reactions that subject the catalysts to severe redox stress, such as the water-gas-shift reaction.This work has been supported by the Spanish Government-MINECO through "Severo Ochoa" (SEV 2012-0267) and MAT2015-71261-R, by the European Union through ERC-AdG-2014-671093 (SynCatMatch) and by the Fundacion Ramon Areces through a research contract of the "Life and Materials Science" program. The Electron Microscopy Service of the UPV is acknowledged for their help in sample characterization. This research used beamline 9-BM and 20-ID of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. We thank Isabel Millet, Elisa Garcia, and Paul Stevens for technical assistance, and Aaron Sattler, Randall Meyer, Rob Carr, and Gary Casty for review of the manuscript and interesting scientific discussions. We appreciate the support of ExxonMobil Research and Engineering in this fundamental research area.Moliner Marin, M.; Gabay, JE.; Kliewer, CE.; Serna Merino, PM.; Corma Canós, A. (2018). Trapping of Metal Atoms and Metal Clusters by Chabazite under Severe Redox Stress. ACS Catalysis. 8(10):9520-9528. https://doi.org/10.1021/acscatal.8b01717S9520952881

Survey of the Gastro-Intestinal Parasites of Cattle in Oklahoma

The Oklahoma Agricultural Experiment Station periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311