The influence of composition and purity of titanium on the mechanical properties and the transformation temperatures of Ni-Ti alloy dental castings was investigated by tensile testing and differential scanning calorimetry (DSC). The compositions of the ingots were 49.0-49.2 at% of titanium content. Three grades of titanium of relatively high purity were used as starting materials. The result sh...

Se invita a los lectores a enviar cartas al Editor, con comentarios, preguntas o críticas sobre artículos que hayan sido publicados en la Revista y a las que los autores aludidos puedan responder. También serán bienvenidos los comentarios sobre problemas de actualidad biomédica, clínica, de salud pública, de ética y de educación médica. Podrá aceptarse la comunicación preliminar de datos parcia...

Uptake hydrogenase is an enzyme that is beneficial for nitrogen fixation in bacteria. Recent studies have shown that Frankia sp. has two sets of uptake hydrogenase genes, organized in synton 1 and synton 2. In the present study, phylogenetic analysis of the structural subunits of hydrogenase syntons 1 and 2 showed a distinct clustering pattern between the proteins of Frankia strains that were i...

Sir, It was good to see Dr Ni Brolchain's interesting study of children with special educational needs (February Journal, p.56). They form a small but important subgroup of a practice child population. I suspect these children and their families may well have higher consultation rates than a control group without special educational needs. I trained for general practice (including nine months i...

Ni-Ti shape memory actuators respond to temperature changes with a shape change. Therefore, they are sensors and actuators. They combine large motion, rather high forces and small size, thus providing high work output. They usually consist of only a single piece of metal, e.g. a helical spring, and do not require sophisticated mechanical systems. They of len fit into tight spaces in given desig...

• TVJT: A puppet makes a statement about a story. A child’s task is to reward or correct the puppet based on the statement. • Previous studies: Children allow the long-distance zibun interpretation. Otsu (1990): disproportional salience of potential antecedents (zibun’s picture) Okabe (2008): failure to satisfy Condition of Plausible Dissent (Crain & Thornton 1998) Taro-wa Akira-ga zibun-ni pen...

Tsetse-borne African animal trypanosomiasis remains a serious threat to livestock production in sub-Saharan Africa. The disease limits the full potential of agricultural development in 36 endemic countries of Africa 1,2. In Ni-geria, livestock production is limited by trypanosomiasis as tsetse flies infest about 75% of the nation's land mass 3 subjecting the animal population at great risk of t...

Recently published data on the precipitation of Ni–Zn ferrite powders prepared by the hydrothermal method have been analysed in a manner consistent with Avrami theory. The results indicate that the value of the time exponent is due to the growth of spherical particles in a solution which becomes progressively depleted of reactants. The analysis also indicates that the process can be considered ...

[Ni(L(1))Fe((t)BuNC)4](PF6)2 is a robust Ni(II)Fe(II) complex that undergoes a reversible one-electron reduction. Spectroscopic and theoretical studies show that [Ni(L(1))Fe((t)BuNC)4](+) is an unprecedented Ni(I)Fe(II) species that reproduces the electronic configuration of the Ni-L state of the [NiFe] hydrogenases.