Critical Evaluation and Thermodynamic Optimization of the Binary Systems in the Mg-Ce-Mn-Y System

Critical evaluation and thermodynamic optimization have been carried out for the Mg-Ce, Mg-Mn, Mg-Y, Ce-Mn, Ce-Y, and Mn-Y binary systems. All phase diagrams and thermodynamic data such as enthalpies of mixing, heats of formation, etc., were considered to obtain one set of model parameters of the Gibbs energies of all phases, which can reproduce the experimental data within experimental error limits. For the liquid alloys, the Modified Quasi-chemical Model in the pair approximation was used to treat short-range-ordering.     

One-sided invasion events in homologous recombination at double-strand breaks

Two classes of homologous recombination mechanism for repair of double-strand breaks (DSBs) have been described in eukaryotes so far. One is conservative and has been explained by the double-strand break repair model (Szostak et al., 1983), whereas the other one is non-conservative and has been explained by the single-strand annealing model (Lin et al., 1984). Here, we will review data supporting the existence of another homologous recombination mechanism for double-strand break repair. We will present the one-sided invasion model that we have proposed to explain this mechanism and discuss its potential implication in various homologous recombination events.     

The processing of DNA ends at double-strand breaks during homologous recombination: different roles for the two ends

We have investigated the role of DNA ends during gap repair by homologous recombination. Mouse cells were transfected with a gapped plasmid carrying distinctive ends: on one side mouse LINE-1 repetitive sequences (L1Md-A2), and on the other rat LINE-1 sequences (L1Rn-3). The gap could be repaired by homologous recombination with endogenous mouse genomic LINE-1 elements, which are on average 95% and 85% homologous to L1Md-A2 and L1Rn-3 ends, respectively. Both L1Md-A2 and L1Rn-3 ends were found to initiate gap repair with equal efficiency. However, there were two types of gap repair products--precise and imprecise--the occurrence of which appears to depend on which end had been used for initiation and thus which end was left available for subsequent steps in recombination. These results, together with sequence analysis of recombinants obtained with plasmids having either mouse or rat LINE-1 sequences flanking the gap, strongly suggest that the two DNA ends played different roles in recombinational gap repair. One end was used to initiate the gap repair process, while the other end was involved at later steps, in the resolution of the recombination event.     

Thermochemical Analysis of Phases Formed at the Interface of a Mg alloy-Ni-plated Steel Joint during Laser Brazing

The thermodynamic stability of precipitated phases at the steel-Ni-Mg alloy interface during laser brazing of Ni-plated steel to AZ31B magnesium sheet using AZ92 magnesium alloy filler wire has been evaluated using FactSage thermochemical software. Assuming local chemical equilibrium at the interface, the chemical activity–temperature–composition relationships of intermetallic compounds that might form in the steel-Ni interlayer-AZ92 magnesium alloy system in the temperature range of 873 K to 1373 K (600 °C to 1100 °C) were estimated using the Equilib module of FactSage. The results provided better understanding of the phases that might form at the interface of the dissimilar metal joints during the laser brazing process. The addition of a Ni interlayer between the steel and the Mg brazing alloy was predicted to result in the formation of the AlNi, Mg₂Ni, and Al₃Ni₂ intermetallic compounds at the interface, depending on the local maximum temperature. This was confirmed experimentally by laser brazing of Ni electro-plated steel to AZ31B-H24 magnesium alloy using AZ92 magnesium alloy filler wire. As predicted, the formation of just AlNi and Mg₂Ni from a monotectic and eutectic reaction, respectively, was observed near the interface.     

Self-Monitoring Without Awareness: Using Mimicry as a Nonconscious Affiliation Strategy.

This research sought to extend the current conceptualization of self-monitoring by examining whether self-monitoring motives and behaviors can operate outside of conscious awareness. Two studies examined nonconscious mimicry among high and low self-monitors in situations varying in affiliative cues. Participants interacted with a confederate who shook her foot (Study 1) or touched her face (Study 2). In both studies, high self-monitors were more likely to mimic the confederate's subtle gestures when they believed the confederate to be a peer (Study 1) or someone superior to them (Study 2). Low self-monitors mimicked to the same degree across conditions. Thus, when the situation contains affiliative cues, high self-monitors use mimicry as a nonconscious strategy to get along with their interaction partner. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cathodic Wear by Delamination of the Al4C3 Layer During Aluminium Electrolysis

Metallurgical and Materials Transactions B - In aluminium reduction cells, an electrochemical reaction occurs between the molten electrolyte film below the aluminium pad and the carbon cathode...     

Simple d-transposition of the great arteries. Results of early balloon septotomy followed by two-stage surgical correction

The follow-up of 44 patients with simple d-transposition of the great arteries is presented. All had balloon atrial septotomy shortly after birth. If an operation was needed at or before one year of age, atrial septectomy was carried out. Correction was done between the ages of 19 and 64 months. Of the 44 patients, 34 (77 per cent) are living and doing well (27 after the Mustard procedure), 3 (7 per cent) are lost to follow-up, and 7 (16 per cent) are dead. Death was due to technical problems during initial catheterization and balloon septotomy in 2 patients, occurred after septectomy in one (3 per cent), and after the Mustard procedure in one (4 per cent). There was one sudden inexplicable death in a 1 1/2-month-old patient, and 2 patients died with pulmonary vascular obstructive disease. Because of the relatively low over-all mortality and morbidity and the low surgical mortality rate for both palliation and correction, we believe that two-stage surgical correction of transposition of the great arteries is preferable to early one-stage correction in the infant.     

The modified quasi-chemical model: Part IV. Two-sublattice quadruplet approximation

The modified quasi-chemical model is further extended, in the quadruplet approximation, to treat, simultaneously, first-nearest-neighbor (FNN) and second-nearest-neighbor (SNN) short-range ordering (SRO) in solutions with two sublattices. When one sublattice is occupied by only one species, or is empty, the model reduces to the modified quasi-chemical model for one sublattice in the pair approximation. The coordination numbers and the ratio of the number of sites on the two sublattices are permitted to vary with composition, thereby making the model ideally suited to the treatment of liquid solutions such as molten salts. The model also applies to solid solutions if the number of sites and coordination numbers are held constant and may be combined with the compound-energy formalism to treat SRO in a wide variety of types of solutions. A significant computational simplification is achieved by formally treating the quadruplets as the “components” of the solution.     

Networks' support and interference with regard to marriage: Disclosures of marital problems to confidants.

Videotapes of 15 maritally adjusted and 13 unadjusted wives' interactions with confidants were coded by means of an observation system that assesses outsiders' support and interference with regard to wives' marriages. Adjusted wives' conversations were more supportive of marriage than were unadjusted wives' conversations, but the groups did not differ on sequences involving interference behaviors. The proportion of happily married confidants in wives' networks was associated with the likelihood of confidants reciprocating wives' support of their own marriages, but confidants' characteristics did not predict interference. Regardless of marital adjustment, confidants' interference behaviors predicted wives' level of distress and distance from husbands after the conversations. The results, which have implications regarding social construction of cognitions in marriages, are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)