Low Cycle Fatigue Damage of Mod.9Cr-1Mo Steel under Non-Proportional Multiaxial Loading

AbstractThis study discusses multiaxial low cycle fatigue damage of Mod.9Cr-1Mo steel under proportional and non-proportional loadings at room and high (823K) temperatures. Strain-controlled multiaxial low cycle fatigue tests were carried out using a hollow cylinder specimen including interruption tests. Strain paths employed were a push-pull straining, a reversed torsion straining and a circle straining. Behaviors of cyclic deformations and failure lives and an evaluation of the failure life are discussed. Surface cracks and microstructures in fatigued specimens are also observed by a digital microscope and a transmission electron microscope (TEM) in order to investigate mechanisms of cyclic deformation, failure and reduction in failure life due to non-proportional loading

Activation of G-protein coupled fMLP or PAF receptor directly triggers glucose transporter type 1 (GLUT1) translocation in Chinese hamster ovary (CHO) cells stably expressing fMLP or PAF receptor

The chemoattractants, fMLP and PAF, stimulate glucose uptake in phagocytes to obtain an energy source for host defense. Glucose uptake in phagocytes is mainly regulated via glucose transporter type1 (GLUT1). To examine molecular mechanisms of facilitated glucose uptake in response to fMLP or PAF, we established CHO cells stably expressing fMLP or PAF receptor with c-myc epitope tagged GLUT1 which could immunologically detect GLUT1 on the cell surface. In the CHO cells, both fMLP and PAF directly triggered GLUT1 translocation from the intracellular pool to the cell surface, and stimulated glucose uptake. Therefore, in phagocytes, we propose that fMLP and PAF also trigger GLUT1 translocation to stimulate glucose uptake as an energy source for host defense

Occurrence of anti-Neospora caninum and anti-Toxoplasma gondii antibodies in horses in the Pantanal of Mato Grosso, Brazil

This study aimed to evaluate the occurrence of anti-Neospora caninum and anti-Toxoplasma gondii antibodies in horses from Pantanal, in Mato Grosso state. Two hundred blood samples were collected from horses in Pantanal of Mato Grosso, Brazil. The samples were analyzed by IFAT for the detection of anti-Neospora caninum and anti-Toxoplasma gondii antibodies. Antibodies to N. caninum were found in 30 (15%) of 200 horses in titers of 50 (25 horses), 100 (two horses), 200 (two horses), and 400 (one horse). Antibodies to T. gondii were found in five (2.5%) of 200 horses in titers of 50 (three horses), 200 (one horse), and 400 (one horse). One animal showed antibody titers for both coccidian (titers of 200 for N. caninum e 400 for T. gondii). The pantaneiros horses were exposed to Neospora spp. and T. gondii

Abnormal Corrosion of Carbon Steels Caused by Cathodic Polarization

We have observed the cathodically polarized specimen surface of S25C and S50C carbon steels, SUS304 stainless steel and pure platinum by using scanning electron microscope. The carbon steel specimens were heat-treated at 100～900℃ after cold-rolling. When these carbon steel specimens were polarized cathodically in an aqueous solution of 0.5kmol/m3 H2SO4, needle-shaped deposits were observed on the specimen surface regardless of heat-treatment temperature. In the specimen of SUS304 stainless steel, slight corrosion was observed, but the deposits were not observed. In the specimen of platinum, a change of the specimen surface was not observed. These experimental results indicate that the deposits observed in the carbon steel specimens are corrosion products, and less noble metals corrode even when they are polarized cathodically