Enzymatic and carbene catalysed ring opening polymerisation can be combined in a one-pot reaction for the metal-free synthesis of degradable block copolymers.

We characterize the pseudo-equivalence of a block lower triangular matrix T = [Tij ] over a regular ring, and its block diagonal matrix D(T ) = [Tii], in terms of suitable Roth consistency conditions. The latter can in turn be expressed in terms of the solvability of certain matrix equations of the form TiiX − Y Tjj = Uij .

Building block methodology from trifluoroethanol and ring-closing metathesis using a Fürstner modification of Grubbs' conditions allows the rapid synthesis of novel difluorinated cyclooctenones.

The pseudo-equivalence of a block lower triangular matrix T = [Tij ] over a regular ring and its block diagonal matrix D(T ) = [Tii] is characterized in terms of suitable Roth consistency conditions. The latter can in turn be expressed in terms of the solvability of certain matrix equations of the form TiiX − Y Tjj = Uij .

BACKGROUND During development, AV conduction switches from base-to-apex to apex-to-base conduction after emergence of the conduction system. We hypothesize that after this transition, the bulk of the AV ring, although no longer required for AV conduction, remains transiently able to conduct, providing a potential arrhythmia substrate. We studied AV conduction during this transition and its sens...

In this paper we study the concurrence and the block-block entanglement in the S = 1/2 spin ladder with four-spin ring exchange by the exact diagonalization method of finite cluster of spins. The relationship between the global phase diagram and the ground-state entanglement is investigated. It is shown that the block-block entanglement of different block size and geometry manifests richer info...

background and objective: bruising is the most common complications that resulting from subcutaneous heparin injection. it causes the limitation of injection area, anxiety, disruption of body image, refusing treatment in patients and the reduction in patients trust in nurse. although different methods were suggested to lessen these unwanted complications, unfortunately none of them could decrea...