The Central Valley at a Crossroads: Migration and Its Implications

Examines recent trends in domestic and international migration flows, population growth, and changes in the region's socioeconomic profile. Looks at policy strategies used by each valley subregion to address challenges presented by recent migration

CONSUMER USE OF CONVENIENCE TYPE STORES: A TELEPHONE INTERVIEW, ROANOKE, VIRGINIA

Consumer/Household Economics,

The Inland Empire in 2015

Presents projections for international and local migration, demographics, education, economic and employment conditions, and political participation for Southern California's Riverside and San Bernardino counties

Experimental study of ductile fracture of tubes under combined tension/torsion

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.Includes bibliographical references (leaf 22).This experiment sought to compare the results of an experimental torsion test on a specimen of 1045 steel with a torsion simulation in the ABAQUS FEA software program. A simulation of a tension test on a round bar of 1045 steel was first executed to determine the correct stress-strain curve for 1045 steel. A torsion specimen was designed based on the constraints of the testing machine, and the torsion test was carried out. A model of the specimen was constructed in ABAQUS using the results of the tension simulation, and a torsion test was simulated. The simulation accurately predicted the shape of the experimental torque vs. twist curve, but the simulated values were 7% higher than the experimental values in the plastic region. The specimen fractured at a rotation of 430 with a plastic strain of 1.013. This was 2.4 times higher than in the tension simulation, where the specimen failed at a strain of 0.427.by Joseph M. Johnson.S.B

Commentary: Effect of Skeletal Muscle Native Tropomyosin on the Interaction of Amoeba Actin with Heavy Meromyosin

Keywords: troponin, tropomyosin, cardiomyopathy, troponin T, mutations Troponin-tropomyosin inhibits skeletal and cardiac muscle contraction at low Ca rigor-type myosin S1 to actin-tropomyosin-troponin, particularly at saturating Ca2+, produces activation of myosin ATPase activity in excess of that seen in the absence of the regulatory proteins. The binding energy of S1 can overcome the inhibitory activity of troponin (Bremel et al., 1972) and may allow tropomyosin to move deep into the groove of actin. That particular arrangement of actin, tropomyosin, and troponin is a much better activator of ATP hydrolysis than actin alone. That active configuration of actin was called state 2 in the Hill model (Hill et al., 1980) and later named the M state because of its requirement for tight myosin binding

Perceptions of Discrimination Among Women as Managers In Hospitality Organizations

Women in hospitality organizations are moving up the corporate ladder at a pace significantly outdistancing their colleagues of a few decades ago, but women managers selectively perceive overt and covert discriminatory resistance, from chauvinism to carefully-contrived covert prejudicial treatment constructed to insure a no-win situation. The authors attempted to determine if these discriminatory practices against equally well-trained, qualified, and experienced hospitality women middle managers do affect their perception of their career growth as compared to male counterpart

A Self-Perpetuating Catalyst for the Production of Complex Organic Molecules in Protostellar Nebulae

The formation of abundant carbonaceous material in meteorites is a long standing problem and an important factor in the debate on the potential for the origin of life in other stellar systems. Many mechanisms may contribute to the total organic content in protostellar nebulae, ranging from organics formed via ion-molecule and atom-molecule reactions in the cold dark clouds from which such nebulae collapse, to similar ion-molecule and atom-molecule reactions in the dark regions of the nebula far from the proto star, to gas phase reactions in sub-nebulae around growing giant planets and in the nebulae themselves. The Fischer-Tropsch-type (FTT) catalytic reduction of CO by hydrogen was once the preferred model for production of organic materials in the primitive solar nebula. The Haber-Bosch catalytic reduction of N2 by hydrogen was thought to produce the reduced nitrogen found in meteorites. However, the clean iron metal surfaces that catalyze these reactions are easily poisoned via reaction with any number of molecules, including the very same complex organics that they produce and both reactions work more efficiently in the hot regions of the nebula. We have demonstrated that many grain surfaces can catalyze both FTT and HB-type reactions, including amorphous iron and magnesium silicates, pure silica smokes as well as several minerals. Although none work as well as pure iron grains, and all produce a wide range of organic products rather than just pure methane, these materials are not truly catalysts