Study of diffusion in copper chromite catalyst under reaction conditions

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Spin-lattice coupling mediated giant magnetodielectricity across the spin reorientation in Ca2FeCoO5

The structural, phonon, magnetic, dielectric, and magneto dielectric responses of the pure bulk Brownmillerite compound Ca2FeCoO5 are reported. This compound showed giant magneto dielectric response (10%-24%) induced by strong spin-lattice coupling across its spin reorientation transition (150-250 K). The role of two Debye temperatures pertaining to differently coordinated sites in the dielectric relaxations is established. The positive giant magneto-dielectricity is shown to be a direct consequence of the modulations in the lattice degrees of freedom through applied external field across the spin reorientation transition. Our study illustrates novel control of magneto-dielectricity by tuning the spin reorientation transition in a material that possess strong spin lattice coupling.Comment: 7 pages, 12 figure

Polarization Sensitive Optical Coherence Tomography for Blood Glucose Monitoring in Human Subjects

A device based on Polarization sensitive optical coherence tomography is developed to monitor blood glucose levels in human subjects. The device was initially tested with tissue phantom. The measurements with human subjects for various glucose concentration levels are found to be linearly dependent on the degree of circular polarization obtainable from the PS-OCT.Comment: 12 pages, 5 figure

Clinical profile and risk factors associated in patients of mucormycosis in COVID-19 pandemic: a study in a tertiary centre

Background: The objective of this study was to determine the clinical profile and risk factors associated in patients of mucormycosis in COVID-19 pandemic.Methods: It was a prospective observational study conducted at a tertiary care centre in the month of May and June 2021. It involved all patients of mucormycosis mainly involving paranasal sinuses and orbit. The clinical profile and associated risk factors leading to mucormycosis were studied.Results: Thirty patients of mucormycosis mean age 56.62 years out of them 25 (83.33%) male and 5 (16.66%) female were studied. Twenty-four patients (80%) had COVID-19 infection, out of them 7 (29.2%) were active and 17 (70.8%) had recovered within 4 weeks. Five (16.6%) patients were suspected as they had symptoms of COVID-19 previously   but never got tested. One   patient had no history of COVID infection. All the patients were diabetic at the time of presentation, out of them 26 (86.6%) of patients were known diabetic and 4 (13.3%) became diabetic after COVID-19 infection. The ethmoids were the most common sinuses affected. Intra-orbital extension was seen in 13 (43.3%) of cases   while intracranial extension was seen in 4 (13.3%) patients. Twenty-eight (93.3%) patients gave history of steroids intake. Antibiotics were taken by 76.6% patients while zinc supplement was used by 83.3% patients. Oxygen was used 10 (33.3%) patients, 80% of them using face mask or canula and 4 of them requiring mechanical ventilatory support.  Conclusions: The risk factors associated with mucormycosis in COVID pandemic must be given serious consideration as there is sudden increase in the case and mortality is very high. Uncontrolled diabetes and over use of steroids in COVID management are two main aggravating factors, however other factors must also be studied thoroughly