A model study of cooperative binding of ionic surfactants to oppositely charged flexible polyions

A novel statistical model for the cooperative binding of monomeric ligands to a linear lattice is developed to study the interaction of ionic surfactant molecules with flexible polyion chain in dilute solution. Electrostatic binding of a ligand to a site on the polyion and hydrophobic associations between the neighboring bound ligands are assumed to be stochastic processes. Ligand association separated by several lattice points within defined width is introduced for the flexible polyion. Model calculations by the Monte Carlo method are carried out to investigate the binding behavior. The hypothesis on the ligand association and its width on the chain are of importance in determining critical aggregation concentration and binding isotherm. The results are reasonable for the interpretations of several surfactant-flexible polyion binding experiments. The implications of the approach are presented and discussed.Comment: 11 pages, 9 figure

“Na-no-hana Project" for recovery from the Tsunami disaster by producing salinity-tolerant oilseed rape lines

Session 1. Environmental Disaster caused by Earthquake

Real-time simulation of jet engines with digital computer. 1: Fabrication and characteristics of the simulator

The fabrication and performance of a real time jet engine simulator using a digital computer are discussed. The use of the simulator in developing the components and control system of a jet engine is described. Comparison of data from jet engine simulation tests with actual engine tests was conducted with good agreement

Performance Evaluation Of Administrators By Faculty In Selected Baccalaureate Programs In Nursing

Purpose of the study was-to evaluate performance effectiveness of administrators by faculty in selected National League for Nursing accredited programs. The research questions focused on congruity in perceptions of Performance Effectiveness in relation to Performance of selected administrative activities, Importance of the activities, Administrative Styles used by the administrator to achieve departmental goals, and maintaining Institutional Milieu. The modified DECA (Departmental Evaluation of Chairperson Activities) was used for data collection. Data analyses were based on 478 DECA-Faculty Reactions to Chairperson Activities and 60 DECA-Chairperson Information Forms. ANOVA results indicated three of the seven faculty variables and two of the nine administrator variables had significant effect on selected faculty ratings of the administrator Performance Effectiveness. Significant mean differences between faculty and administrator self-ratings were found in four out of the twelve subscales. Pearson correlation showed significant coefficient in one of the subscales and four out of the twelve subscale ratings were negatively correlated

VLBI Observations of Water Masers in the Circumstellar Envelope of IRC+60169

Water masers around an AGB star, IRC+60169, were observed at four epochs using the Japanese VLBI networks. The distribution of the maser features is limited in a thick-shell region, which has inner and outer expansion velocities of 7 km/s and 14 km/s at radii of 25 mas and 120 mas, respectively. The distribution of the red-shifted features exhibits a ring-like structure, the diameter of which is 30 mas, and corresponds to the inner radius of the maser shell. This implies that dense gas around the star obscures red-shifted emission. Although a position--radial velocity diagram for the maser features is consistent with a spherical shell model, the relative proper motions do not indicate an expansion motion of the shell. A remarkable property has been found that is a possible periodic change of the alignment pattern of water maser spots.Comment: 9 pages including 7 figures, to appear in PASJ, Vol. 54, No.

Extra-large crystal emulsion detectors for future large-scale experiments

Photographic emulsion is a particle tracking device which features the best spatial resolution among particle detectors. For certain applications, for example muon radiography, large-scale detectors are required. Therefore, a huge surface has to be analyzed by means of automated optical microscopes. An improvement of the readout speed is then a crucial point to make these applications possible and the availability of a new type of photographic emulsions featuring crystals of larger size is a way to pursue this program. This would allow a lower magnification for the microscopes, a consequent larger field of view resulting in a faster data analysis. In this framework, we developed new kinds of emulsion detectors with a crystal size of 600-1000 nm, namely 3-5 times larger than conventional ones, allowing a 25 times faster data readout. The new photographic emulsions have shown a sufficient sensitivity and a good signal to noise ratio. The proposed development opens the way to future large-scale applications of the technology, e.g. 3D imaging of glacier bedrocks or future neutrino experiments.Comment: Version accepted for publication in JINS