Chemodivergent, enantio- and regioselective couplings of alkynes, aldehydes and silanes enabled by nickel/N-heterocyclic carbene catalysis.

Divergent synthesis of valuable molecules through common starting materials and metal catalysis represents a longstanding challenge and a significant research goal. We here describe chemodivergent, highly enantio- and regioselective nickel-catalyzed reductive and dehydrogenative coupling reactions of alkynes, aldehydes, and silanes. A single chiral Ni-based catalyst is leveraged to directly prepare three distinct enantioenriched products (silyl-protected trisubstituted chiral allylic alcohols, oxasilacyclopentenes, and silicon-stereogenic oxasilacyclopentenes) in a single chemical operation.

Study on the effect of space tightness on the inerting effect of liquid CO in pottery jar liquor warehouses.

To investigate the effect of space tightness on inerting of liquid CO. Pottery jar liquor warehouse was selected as the research subject, numerical simulation was utilized to study the spatial inerting and CO migration and distribution under different space tightness degrees and injection flow rates. The results revealed that after injection into the space, CO distributed like an "umbrella", the CO protective layer undergoes a dynamic process of concentration increase and thickness enhancement, achieving upward accumulation and migration of the inert medium protective layer.

Cerebral Hemorrhage in Varicella-Zoster Virus Encephalitis: A Case Study.

BACKGROUND Varicella-zoster virus (VZV) encephalitis is a commonly reported form of encephalitis that clinically manifests as skin lesions, fever, headache, and neuropsychiatric symptoms. We present a case of a patient with VZV encephalitis complicated by cerebral hemorrhagic transformation, characterized by high levels of inflammation and protein in the cerebrospinal fluid. The aim is to highlight the risk of hemorrhagic transformation associated with VZV encephalitis.

The effect of aging on the ciliary muscle and its potential relationship with presbyopia: a literature review.

Background: The ciliary muscle is known to play a part in presbyopia, but the mechanism has not received a comprehensive review, which this study aims to achieve. We examined relevant articles published from 1975 through 2022 that explored various properties of the muscle and related tissues in humans and rhesus monkeys. These properties include geometry, elasticity, rigidity, and composition, and were studied using a range of imaging technologies, computer models, and surgical methods.

Quantitative electroencephalography predicts postoperative delirium in adult cardiac surgical patients from a prospective observational study.

The diagnostic and prognostic value of quantitative electroencephalogram (qEEG) in the the onset of postoperative delirium (POD) remains an area of inquiry. We aim to determine whether qEEG could assist in the diagnosis of early POD in cardiac surgery patients. We prospectively studied a cohort of cardiac surgery patients undergoing qEEG for evaluation of altered mental status.