A theoretical ac impedance model of biological tissue has been proposed after studying a cellular membrane using X-ray diffraction technique [1], a metal/organic system using ac impedance spectroscopy [2] and reviewing two pieces of literature of similar topics [3,4]. This paper emphasizes ac impedance techniques which can be used to study any heterogeneous materials in order to develop a lumpe...

Meyer, W. W., and Lind, J. (1972). Archives of Disease in Childhood, 47, 364. Calcifications of iliac arteries in newborns and infants. Calcific incrustations of the primary internal elastic membrane in the common and internal iliac arteries could be shown grossly by a modified Von Kossa reaction in one-half of all necropsied newborns and infants in the first 4 weeks of life. The calcium conten...

In order to better understand the mechanism of daptomycin resistance, we generated a daptomycin-nonsusceptible derivative strain, strain 10*3d1 (MIC = 3.0 microg/ml), by in vitro exposure of methicillin-resistant Staphylococcus aureus strain N315DeltaIP (MIC = 0.5 microg/ml) to daptomycin. We also obtained a daptomycin-susceptible phenotypic revertant strain, strain 10*3d1-10 (MIC = 1.0 microg/...

Perforin (PFN) is a pore-forming protein produced by cytotoxic lymphocytes that aids in the clearance of tumor or virus-infected cells by a mechanism that involves the formation of transmembrane pores. The properties of PFN pores and the mechanism of their assembly remain unclear. Here, we studied pore characteristics by functional and structural methods to show that perforin forms pores more h...

We report a familiar syndrome of recurrent heterogeneous infectious diseases, caused by bacteria, fungi, and viruses, which has as its only detectable defect the lack of CD53 antigen expression in neutrophils. All other assays ruled out known causes of recurrent infectious diseases due to either leukocyte adhesion or phagocytosis defects. CD53 belongs to the transmembrane-4 superfamily of prote...

Molecular mechanisms of gene regulation underlying the activity-dependent long term changes of cellular electrical properties, such as those during memory, are largely unknown. We have shown that alternative splicing can be dynamically regulated in response to membrane depolarization and Ca(2+)/calmodulin-dependent protein kinase IV (CaMKIV) activation, through special CaM kinase responsive RNA...

The isolated, formaldehyde-fixed nucleoid of E. coli has been analyzed by isopycnic centrifugation in CsCl density gradients. The membrane-free nucleoid bands at a density of 1.69 +/- 0.02 g/cm3. The membrane-associated nucleoid bands at a density of 1.46 +/- 0.02 g/cm3. Both species sediment to equilibrium as nearly monodisperse bands in CsCl, suggesting that the nucleoid components of DNA, RN...

Proton exchange membrane fuel cells (PEMFCs) are an important alternative to fossil fuels and a complement batteries for the electrification of vehicles. However, their high cost obstructs commercialization, catalyst material, including its synthesis, constitutes one major components. In this work, Pt–Ni Pt–Ni–Mo(O) nanoparticles (NPs) varying composition have been synthesized in single step by...

Thermal conductivity of a material is critical parameter for using it in non-isothermal applications. The new emphasis on ion-exchange membranes as thermoelectric materials makes necessary to study the relation between thermal and structure properties. Here, through-plane different polymeric was measured by rapid experimental method simple Lee's Disc apparatus. Membranes with structures thickne...

The purpose of this study was to determine the main patterns toxic effect lead on red marrow cells birds in first three days after exposure. electro-microscopic revealed that nitrate bone begins even at a slight MAL excess 1 day intoxication. Hematopoietic and stromal mainly show signs dystrophic changes, which increase as term exposure increases. In cytoplasm many cells, heterogeneous lipid in...