Magnetic and humidity sensing properties of nanostructured Cu[x]Co[1-x]Fe2O4 synthesized by auto combustion technique

Magnetic nanomaterials (23-43 nm) of Cu$_x$Co$_{1-x}$Fe$_2$O$_4$\ (x = 0.0, 0.5 and 1.0) were synthesized by auto combustion method. The crystallite sizes of these materials were calculated from X-ray diffraction peaks. The band observed in Fourier transform infrared spectrum near 575 cm$^{-1}$ in these samples confirm the presence of ferrite phase. Conductivity measurement shows the thermal hysteresis and demonstrates the knee points at 475$^o$C, 525$^o$C and 500$^o$C for copper ferrite, cobalt ferrite and copper-cobalt mixed ferrite respectively. The hystersis M-H loops for these materials were traced using the Vibrating Sample Magnetometer (VSM) and indicate a significant increase in the saturation magnetization (M$_s$) and remanence (M$_r$) due to the substitution of Cu$^{2+}$ ions in cobalt ferrite, while the intrinsic coercivity (H$_c$) was decreasing. Among these ferrites, copper ferrite exhibits highest sensitivity for humidity.Comment: 12 pages, 7 figure

Electronic structure studies of Fe- ZnO nanorods by x-ray absorption fine structure

We report the electronic structure studies of well characterized polycrystalline Zn_{1-x}Fe_xO (x = 0.0, 0.01, 0.03, and 0.05) nanorods synthesized by a co-precipitation method through x-ray absorption fine structure (XAFS). X-ray diffraction (XRD) reveals that Fe doped ZnO crystallizes in a single phase wurtzite structure without any secondary phase. From the XRD pattern, it is observed that peak positions shift towards lower 2\theta value with Fe doping. The change in the peak positions with increase in Fe contents clearly indicates that Fe ions are replacing Zn ions in the ZnO matrix. Linear combination fittings (LCF) at Fe K-edge demonstrate that Fe is in mixed valent state (Fe3+/Fe2+) with a ratio of ~ 7:3 (Fe3+:Fe2+). XAFS data is successfully fitted to wurtzite structure using IFEFFIT and Artemis. The results indicate that Fe substitutes Zn site in the ZnO matrix in tetrahedral symmetry.Comment: 7 pages, 5 figures, 2 tables, regular articl

Protein Tyrosine Phosphatase 1B (PTP1B): A Critical Molecular Target for Treatment and Management of Related Complications in Type-II Diabetes and Obesity

One of our society\u27s biggest health challenges is type 2 diabetes mellitus. In order to control this chronic condition and its associated problems, novel therapies are being developed despite the wide range of alternatives available for existing medication treatments. Since protein tyrosine phosphatase 1B (PTP1B) is an essential component of a negative regulator in the insulin and leptin signaling pathways, it is a promising therapeutic target for a number of human disorders, including type 2 diabetes (T2DM) and obesity. PTP1B inhibitors improve insulin receptor sensitivity and can treat illnesses linked to insulin resistance. Type 2 diabetes mellitus and the group of cardiovascular risk factors known as the "metabolic" syndrome are strongly linked to resistance to the cellular action of insulin, a fundamental pathophysiological defect that accompanies the global obesity epidemic. The creation of new pharmaceuticals that lessen insulin resistance may be crucial for treating and preventing diabetes as well as lowering the cardiovascular risk profile that goes along with it. Research on the function of protein-tyrosine phosphatase PTP1B in the cell has now demonstrated unequivocally that it is a crucial negative regulator of the tyrosine phosphorylation cascade, which is essential to the insulin signaling pathway. In over nourished situations, PTP1B inhibition also decreases the amount of triglycerides stored in adipose tissue and is not linked to any apparent harm. In general, these investigations have cleared the path for the commercialization of PTP1B inhibitors, which could potentially function as an innovative kind of "insulin sensitizer" for the treatment of type 2 diabetes and the metabolic syndrome

A new texture of neutrino mass matrix with three constraints

We present a new texture of neutrino mass matrix having three complex relations among its elements and study in detail the phenomenological implications. A characteristic feature of the resulting neutrino mass matrix is that the atmospheric neutrino mixing angle is predicted to lie in a very narrow region near $45^{\circ}$. We illustrate how such a form of the neutrino mass matrix can be realized using the non-Abelian flavor symmetry $A_4$ in the framework of type-I+II seesaw mechanism.Comment: 10 pages, 2 figures, 2 tables, matches published versio

Neutrino Mass Matrices with Generalized CP Symmetries and Texture Zeros

We investigate the properties of neutrino mass matrices that incorporate texture zeros and generalized CP symmetries associated with tribimaximal mixing. By combining these approaches, we derive predictive neutrino mass matrices and explore their implications for mass hierarchies, mixing angles, and CP-violating phases. We find that the three angles defining the generalized CP symmetries have narrow allowed ranges. We also obtain distinct correlations between the three mixing angles and the CP-violating phases that distinguish the various texture patterns from one another. Moreover, we compute the effective neutrino mass for neutrinoless double beta decay and the sum of neutrino masses. Our results highlight the predictability and testability of neutrino mass matrices with generalized CP symmetry.Comment: 22 pages, 5 figures, 4 table