Ultralow thermal conductivity and thermally-deactivated electrical transport in a 1D silver array with alternating δ-bonds.

We report the synthesis of a (TMA)AgBr (TMA = tetramethylammonium) crystal, which comprises inorganic anionic chains of -(AgBr)- stabilized by columnar stacks of organic TMA cations with a periodic arrangement of shorter and longer Ag(i)⋯Ag(i) bonds, even though all the Ag(i) ions are chemically equivalent. The presence of two chemically non-equivalent bridging Br ions is attributed to the primary cause of such an unusual arrangement, as clearly visualized in the charge density plot of (TMA)AgBr extracted from the theoretical calculations based on density functional theory. Remarkably, we identified from the orbital-projected density of states the existence of alternate δ-like bonding involving d orbitals of 4d Ag(i), which was attributed to the cause for ultralow thermal conductivity and thermally-deactivated electrical transport in (TMA)AgBr.

A Retrospective Study of Covid-19 Patients: A Real-Life Experience in a Secondary Care Hospital, Jashore, Bangladesh.

Covid-19 was first detected on 8th March of 2020 in Bangladesh after the global pandemic being started. As a new virus and disease there are scarcity of data of SARS-CoV-2 and Covid-19 respectively in our country. Aim of this study is to assess the demographic characteristics, clinical profiles, underlying co-morbid conditions, treatment pattern and outcome of the SARS-CoV-2 positive patients in Jashore, Bangladesh.

Excitonic cuprophilic interactions in one-dimensional hybrid organic-inorganic crystals.

The everlasting pursuit of hybrid organic-inorganic lead-free semiconductors has directed the focus towards eco-friendly copper-based systems, perhaps because of the diversity in chemistry, controlling the structure-property relationship. In this work, we report single crystals of a Cu(i) halide-based perovskite-like organic-inorganic hybrid, (TMA)CuBr, (TMA = tetramethylammonium), consisting of unusual one-dimensional inorganic anionic chains of -(CuBr)-, electrostatically stabilized by organic cations, and the Cu(i)-Cu(i) distance of 2.775 Å indicates the possibility of cuprophilic interactions.

Endoscopic Transnasal Repair of Cerebrospinal Fluid Leakage: Experience in BSMMU.

Endoscopic transnasal repair of CSF rhinorrhoea is gaining popularity around the world because of its tremendous success rate but it depends on defect site, size, technique of repair, experiences of surgeon and also patient's profile. Aim of this study was to analysis of surgical outcome of endoscopic transnasal repair of CSF rhinorrhoea. A retrospective study carried out in the department of ENT and Head neck surgery at Bangabandhu Sheikh Mujib Medical University (BSMMU) from January 2018 to December 2019.