4,801 research outputs found
Odd-primary homotopy exponents of compact simple Lie groups
We note that a recent result of the second author yields upper bounds for
odd-primary homotopy exponents of compact simple Lie groups which are often
quite close to the lower bounds obtained from v_1-periodic homotopy theory.Comment: This is the version published by Geometry & Topology Monographs on 22
February 200
The Effects of Private Self-Consciousness and Perspective Taking on Satisfaction in Close Relationships.
131 heterosexual student couples, aged 17–32 yrs, 30 of whom were married or engaged answered questions concerning themselves and their relationships. It was predicted that individual differences in private self-consciousness would be positively related to relationship satisfaction because of the greater self-disclosure resulting from that heightened self-attention. It was further predicted that individual differences in perspective taking would foster relationship satisfaction, independent of any influence of self-disclosure. Both expectations were confirmed. Scores on the private self-consciousness scale were predictive of reported self-disclosure, and self-disclosure was predictive of satisfaction in the relationship. Once the influence of self-disclosure was removed, no effect of self-consciousness on satisfaction remained. In contrast, after disclosure was controlled, perspective-taking scores were significantly related to satisfaction and were in fact unrelated to disclosure at all. Findings indicate that 2 personality characteristics having to do with habitual attention to behavioral tendencies, emotions, and motivations significantly enhance the quality of close heterosexual relationships in different ways
Feeder Cattle Basis in South Carolina 2000-2004
Livestock Production/Industries,
Cosmic Strings, Zero Modes and SUSY breaking in Nonabelian N=1 Gauge Theories
We investigate the microphysics of cosmic strings in Nonabelian gauge
theories with N=1 supersymmetry. We give the vortex solutions in a specific
example and demonstrate that fermionic superconductivity arises because of the
couplings and interactions dictated by supersymmetry. We then use supersymmetry
transformations to obtain the relevant fermionic zero modes and investigate the
role of soft supersymmetry breaking on the existence and properties of the
superconducting strings.Comment: 12 pages, RevTex, submitted to Phys. Rev.
Activity And Localization Of Maltodextrin Binding Site Mutants Of Glycogen Synthase In Saccharomyces Cerevisiae
Mentor: Wayne A. WilsonGlycogen is a glucose polymer formed by the enzyme glycogen synthase and is used in many organisms
to store chemical energy. Saccharomyces cerevisiae (baker’s yeast) was used to study the activity
and localization of glycogen synthase. Genes GSY1 and GSY2 encode glycogen synthase. GSY2 is
responsible for the formation of Gsy2p, whose action accounts for ~90% of glycogen synthase activity;
the remainder of total glycogen synthase activity stems from Gsy1p. Because glycogen synthase
binds to glycogen, it can be used to determine glycogen localization. Glycogen synthase can appear in
distinct patterns throughout the cell. Gsy2p has been shown to be regulated by phosphorylation. Phosphorylation
of Gsy2p leads to inactivation of the enzyme, a decrease in glycogen storage, and a more
localized pattern of glycogen synthase. Conversely, lowering the phosphorylation state of Gsy2p results
in increased glycogen production and delocalization of glycogen synthase throughout the cell.
Glucose-6-P (glucose-6-phosphate) activates glycogen synthase regardless of its phosphorylation
state.
We obtained a set of plasmids from a collaborator, encoding Gsy2p mutated at sites believed to be
involved with maltodextrin binding. Maltodextrin is a chain of 20 or fewer dextrose molecules with α
(1→4) glycosidic bonds. A protein sequence involved in maltodextrin binding likely would also bind
to glycogen. Our task was to discover the localization pattern shown by the maltodextrin binding site
mutants of glycogen synthase using a GFP tag on GSY2. The goal of this study was to determine the
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effects of Gsy2p maltodextrin binding mutants on glycogen synthase activity, localization, and glycogen
accumulation
Shoot dieback during prolonged drought in Ceanothus (Rhamnaceae) chaparral of California: a possible case of hydraulic failure
Journal ArticleProgressive diebacks of outer canopy branchlets of Ceanothus crassifolius were repeatedly observed after rainless periods up to 9 mo in duration in the Santa Monica Mountains of southern California. Mean xylem pressures of branchlets near the end of drought were as low as -11.2 MPa (N = 22) with a mean of about 60 dead branchlets per shrub
Vacuum Decay on a Brane World
The bubble nucleation rate for a first order phase transition occurring on a
brane world is calculated. Both the Coleman-de Luccia thin wall instanton and
the Hawking-Moss instanton are considered. The results are compared with the
corresponding nucleation rates for standard four-dimensional gravity.Comment: 5 page
Relationship between Dehydration Tolerance of California Ferns and the Mechanical Strength of their Stipes
In vascular plants, water moves upwards through xylem vessels/tracheids due to negative pressures created by the evaporative pull of water. Under severe dehydrated, extreme negative pressures are known to cause xylem cavitation and embolism. In seed-bearing plants, the mechanical support of stem xylem has been shown to be a good predictor of cavitation resistance, presumably because sclerenchyma fibers buttress against micro-fracture or collapse of conduit walls. In spore-bearing plants, such as ferns, current anatomical theory indicates that mechanical support lies external to underlying xylem, in the outer hypodermal region, leaving the central xylem in ferns without any fiber support. In light of this anatomical difference, we hypothesized that there would be no correlation between the mechanical strength of fern stipes and their cavitation resistance. In this study we used dehydration tolerance of twelve California fern species as a surrogate for cavitation resistance. We used a Scholander-Hammel pressure chamber to examine minimum seasonal water potential (Ymin) and pressure-volume curves to estimate the osmotic potential of leaf tissue at the turgor loss point (Ys,tlp). We used a four point bending test via an Instron Mechanical Testing Devise to estimate stipe mechanical strength (Modulus of Elasticity, MOE). We found large differences among our 12 fern species. Minimum seasonal water potential varied between -1.1 and -8.3 MPa and mean Ys,tlp varied between -1.1 and -3.4 MPa. Modulus of Elasticity of fern stipes varied nearly ten-fold, between 0.0025 N/m2 and 0.023 N/m2. Consistent with our initial hypothesis, we found no correlation between the mechanical strength of stems (MOE) and their dehydration tolerance, either in terms of Ys,tlp (r2 = 0.005) or Ymin (r2 = 0.011). Taken together, we speculate that the lack of a correlation between stipe mechanical strength and dehydration tolerance reflects the relictual separation of fern water transport conduits from mechanical support
Gulf Stream velocity structure through combined inversion of hydrographic and acoustic doppler data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.Microfiche copy available in Archives and Science.Bibliography: leaves 64-65.by Stephen D. Pierce.M.S
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