Quantification of biomass availability for wood harvesting and storage in the continental United States with a carbon cycle model.

Background: Wood Harvesting and Storage (WHS) is a form of Biomass Carbon Removal and Storage (BiCRS) that utilizes a combined natural and engineered process to harvest woody biomass and put it into long term storage, most frequently in the form of subterranean burial. This paper aims to quantify the availability of woody biomass for the purposes of WHS in the continental United States using a carbon cycle modeling approach. Using a regional version of the VEGAS terrestrial carbon cycle model at 10 km resolution, this paper calculates the annual woody net primary production in the continental United States.

Partial versus Complete Sternotomy for Aortic Valve Replacement-Multicenter Study.

Background:  The benefits of minimally invasive techniques in cardiac surgery remain poorly defined. We evaluated the short- and mid-term outcomes after surgical aortic valve replacement through partial upper versus complete median sternotomy (MS) in a large, German multicenter cohort.

Methods:  A total of 2,929 patients underwent isolated surgical aortic valve replacement via partial upper sternotomy (PUS,  = 1,764) or MS ( = 1,165) at nine participating heart centers between 2016 and 2020.

Silyl Groups Are Strong Dispersion Energy Donors.

We present an experimental and computational study to investigate noncovalent interactions between silyl groups that are often employed as "innocent" protecting groups. We chose an extended cyclooctatetraene (COT)-based molecular balance comprising unfolded (1,4-disubstituted) and folded (1,6-disubstituted) valance bond isomers that typically display remote and close silyl group contacts, respectively. The thermodynamic equilibria were determined using nuclear magnetic resonance measurements.

Transcatheter mitral valve implantation versus conventional redo surgery for degenerated mitral valve prostheses and rings in a multicenter registry.

Objectives: Degeneration of mitral prostheses/rings may be treated by redo surgery, and, recently, by transcatheter valve-in-valve/ring implantation. This multicenter registry presents results of transcatheter valve-in-valve and repeat surgery for prostheses/rings degeneration.

Methods: Data provided by 10 German heart centers underwent propensity score-matched retrospective analysis.

Assessing the Experimental Hydrogen Bonding Energy of the Cyclic Water Dimer Transition State with a Cyclooctatetraene-Based Molecular Balance.

We have conducted an experimental and computational study of cyclooctatetraene-1,4/1,6-dimethanol ( and ) as a molecular balance with the goal in mind to determine the otherwise inaccessible hydrogen bonding energy (HBE) of the cyclic water dimer, which constitutes a transition state. The folding equilibrium is governed by an intramolecular hydrogen bond in the folded -isomer, in which the OH groups adopt a cyclic planar geometry, akin to the structure of the cyclic water dimer transition state. We characterized hydrogen bonding in and reference complexes utilizing SAPT2 + (3)δMP2/aug-cc-pVTZ and selected quantum theory of atoms in molecule descriptors at M06-2XD3(0)/ma-def2-TZVPP.