The current of the system substituted by two amino groups on the same side is bigger than that on the different side. Contrarily, the current of the system substituted by two nitro groups on the same side is smaller than that on the different
side. More importantly, the negative differential resistance (NDR) behavior can be observed only when the system substituted by two amino groups on the same side. The mechanisms are proposed for the effect of the side groups and NDR behavior. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3446294]“
“Pyromellitic dianhydride-based dianhydrides with bulky substituents, selleck chemical such as 1-phenylpyromellitic dianhydride and 1-(4′-trifluoromethylphenyl)pyromellitic dianhydride, were combined with bis(3-aminophenyl)phenylphosphine oxide and 4,4′-phenylene diamine to prepare polyimides with low coefficient of thermal expansion 17 ppm/degrees C) and good adhesion (>100 g/mm). The polyimides were synthesized via a conventional two-step process: preparation of poly(amic-acid) followed by solution imidization with a-dichlorobenzene. The molecular weights of the polyimides were controlled to 25,000 g/mol via off-stoichiometry and the synthesized polyimides were characterized by Fourier transform infrared, nuclear magnetic resonance, differential scanning calorimetry, and thermogravimetric analysis. Their intrinsic viscosity learn more and solubility were also measured, while adhesive property
was measured via T-peel test samples of Cu/polyimide. (C) 2010 Wiley Periodicals, Inc. J Apial Polym Sci 117: 736-741, 2010″
“We describe a technique used in enucleated pig eyes to create a uniformly hardened lens nucleus and an anterior capsule
similar to the cataractous human lens. After treatment with microwave heat and a fixative agent, the pig eyes have clear corneas, anterior capsules with less tension and elasticity, and harder lens nuclei, with a consistency similar to that of a nuclear sclerosis grade I to V in the Emery-Little classification. The eyes can be used by residents in training to practice various phacoemulsification techniques, including continuous curvilinear capsulorhexis, hydrodelineation, sculpting, divide and conquer, phaco chop, and nondividing phacoemulsification.”
“Objectives. MK-8931 concentration This study aimed to identify the independent biomarkers and clinical factors that could predict ICU mortality and 6-month outcomes in relatively healthy patients with severe pneumonia and acute respiratory distress syndrome (ARDS). Patients and Methods. We prospectively enrolled patients with severe pneumonia-related ARDS that required mechanical ventilation. Patients were excluded if they were unable to take care of themselves. Several biomarkers and clinical factors were evaluated prospectively on day 1 and day 3 after ICU admission. All biomarkers and clinical factors were collected for analysis. Results. 56 patients were enrolled in this study.