Bisphenol A-induced polycystic ovary syndrome (PCOS) with hormonal and metabolic implications in rats.

There is a rising incidence of polycystic ovary syndrome (PCOS) cases worldwide in women of reproductive age due to environmental factors. We evaluated the effect of an environmental estrogen, bisphenol A (BPA) for its reprotoxicity regarding the induction of PCOS in rats and also assessed its hormonal and metabolic implications. There was 66.

Iodine-Based Dual-Energy Computed Tomography After Mechanical Thrombectomy Predicts Secondary Neurologic Decline from Cerebral Edema After Severe Stroke.

Background: Patients with severe stroke are at high risk of secondary neurologic decline (ND) from the development of malignant cerebral edema (MCE). However, early infarcts are hard to diagnose on conventional head computed tomography (CT). We hypothesize that high-energy (190 keV) virtual monochromatic imaging (VMI) from dual-energy CT (DECT) imaging enables earlier detection of ND from MCE.

NHC-Catalyzed Aldimine Umpolung/6π-Electrocyclization Cascade to Access Tetracyclic Dihydrochromeno Indoles.

The umpolung of aldimines using N-heterocyclic carbenes (NHCs) is less explored compared to the established polarity reversal of aldehydes. Described herein is an NHC-catalyzed imine umpolung /6π-electrocyclization cascade, which leads to the atom- and pot-economic synthesis of biologically important dihydrochromeno indoles. For the first time, the nucleophilic aza-Breslow intermediates have been intercepted with unactivated alkynes.

Mechanism and stereoselectivity in metal and enzyme catalyzed carbene insertion into X-H and C(sp)-H bonds.

Constructing highly proficient C-X (X = O, N, S, ) and C-C bonds by leveraging TMs (transition metals) (Fe, Cu, Pd, Rh, Au, ) and enzymes to catalyze carbene insertion into X-H/C(sp)-H is a highly versatile strategy. This is primarily achieved through the generation of metal carbenes from the interaction of TMs with diazo compounds. Over the last few decades, significant advancements have been made, encompassing a wide array of X-H bond insertions using various TMs.

Unveiling the importance of catalyst framework and non covalent interactions in an asymmetric Fe-catalyzed O-H insertion: insights from computational tools.

Fe-based catalysts as well as enzymes typically yield low stereoselectivity for carbene insertion into X-H bonds. Here, we have utilized DFT methods to understand the mechanism and unusually high enantioselectivity in an Fe-spiroBox catalyzed carbene insertion reaction into the O-H bond of aliphatic alcohols. Our transition state model shows a unique binding of the reaction intermediates to the chiral catalyst enabled by weak non covalent interactions that is absent in other X-H insertion reactions.