Frustrated Lewis pair adducts of alkynyl-capped tetrelenes.

The frustrated Lewis pair (FLP) adducts PB{ECl} (PB = PrP(CH)BCy; Cy = cyclohexyl; E = Si, Ge) were used to access a bis(alkynyl)-functionalized silylene and a germylene; the goal behind preparing these species was to obtain new unsaturated main group polymers [E(CCSiMe)] upon heating. While the silylene adduct PB{Si(CCSiMe)} was stable up to 150 °C, the heavier element congener PB{Ge(CCSiMe)} underwent a complicated rearrangement process accompanied by Cy-group migration and Ge(II)-alkyne coordination. Density functional theory computations were performed to understand the mechanistic pathway for the unusual rearrangement of PB{Ge(CCSiMe)}.

Confined Lewis Pairs: Investigation of the X →Si Interaction in Halogen-Encapsulating Silafulleranes.

A joint theoretical and experimental study on 32 endohedral silafullerane derivatives [X@Si Y ] (X=F-I; Y=F-I, H, Me, Et) and -[Cl@Si H Y ] (Y=F-I) is presented. First, we evaluated the structure-determining template effect of Cl in a systematic series of concave silapolyquinane model systems. Second, we investigated the X →Si interaction energy ( ) as a function of X and Y and found the largest values for electron-withdrawing exohedral substituents Y.

[Prenatal Radiation Exposure in Nuclear Medicine].

Radiation exposure from nuclear medicine procedures during pregnancy may cause uncertainty among patients and medical professionals. In 2019, the German Society of Medical Physics (DGMP) and the German Society of Radiology (DRG) published a fully revised version of the report "Prenatal Radiation Exposure Arising from Medical Indication, Dose Calculation, Conclusions for Physicians and Pregnant Women". This report offers a basis for dose calculation and determination of radiation exposure to the unborn.

Prenatal radiation exposure in diagnostic and interventional radiology.

Background:  The exposure of a pregnant woman to X-rays is an event that can cause uncertainty for all concerned. This review provides guidance on how to assess such a situation and how to determine the dose to the unborn child. In general, the use of X-rays in pregnant women in radiology should be avoided.

Effects of deceleration-focused exercise strategies on shoulder range of motion and throwing velocity in baseball and softball athletes.

This study examined the effects of deceleration-focused exercises on shoulder range of motion and throwing velocity in both softball and baseball players. Volunteers included 28 Division III William Paterson University baseball and softball athletes (18 females and 10 males), who were evenly distributed across two groups both undertaking 14 sessions of either resistance band or handheld medicine ball exercises (band vs. ball group).