Exploring Electrophilic Hydrophosphination via Metal Phosphenium Intermediates.

Two Mo(0) phosphenium complexes containing ancillary secondary phosphine ligands have been investigated with respect to their ability to participate in electrophilic addition at unsaturated substrates and subsequent P-H hydride transfer to "quench" the resulting carbocations. These studies provide stoichiometric "proof of concept" for a proposed new metal-catalyzed electrophilic hydrophosphination mechanism. The more strongly Lewis acidic phosphenium complex, [Mo(CO)(PRH)(PR)] (R=Ph, Tol), cleanly hydrophosphinates 1,1-diphenylethylene, benzophenone, and ethylene, while other substrates react rapidly to give products resulting from competing electrophilic processes.

Baccalaureate Education as an Entry-to-Practice Requirement: Why It Matters Now More Than Ever.

Given the nursing shortage, nurse educators and leaders are responsible now more than ever to advocate for baccalaureate education as an entry-to-practice requirement for registered nurses. The world today is complex, with population health issues stemming from the COVID-19 pandemic, high patient acuity and climate change. Accordingly, a nursing workforce that receives high-quality education is required.

Multiple-source current steering in subthalamic nucleus deep brain stimulation for Parkinson's disease (the VANTAGE study): a non-randomised, prospective, multicentre, open-label study.

Background: High-frequency deep brain stimulation (DBS) with a single electrical source is effective for motor symptom relief in patients with Parkinson's disease. We postulated that a multiple-source, constant-current device that permits well defined distribution of current would lead to motor improvement in patients with Parkinson's disease.

Methods: We did a prospective, multicentre, non-randomised, open-label intervention study of an implantable DBS device (the VANTAGE study) at six specialist DBS centres at universities in six European countries.

Size-dependent maximization of upconversion efficiency of citrate-stabilized β-phase NaYF4:Yb(3+),Er(3+) crystals via annealing.

Upconversion materials show great potential in converting infrared light to visible for many optoelectronic and photovoltaic devices. One of the most promising upconverting materials is Yb(3+),Er(3+)- doped β-NaYF4. In this study, annealing is shown to have a significant impact on the phase, morphology, and upconversion luminescence of β-NaYF4:Yb(3+),Er(3+) crystals of varying sizes (300 nm, 700 nm, and 2.