Experiment 865 at the Brookhaven AGS has observed the decay K + → e + νeµ + µ − . The branching ratio extracted is (1.72±0.37(stat)±0.17(syst)±0.19(model))×10 −8 where the third term in the error results from the use of a model to extrapolate into a kinematic region dominated by background.
The purpose of this paper Is to describe a novel charge transport scheme In semiconductors In which the field responsible for the charge transport Is Independent of the depletion field. The application of the novel charge transport scheme leads to the following new semiconductor detectors: 1) Semiconductor Drift Chamber 11) Ultra low capacitance-large area semiconductor x-ray spectrometers and photodiodes. iii) Fully Depleted Thick CCD Special attention is paid to the concept of the Semiconductor Drift Chamber as a position sensing detector for high energy charged particles. Position resolution limiting factors are considered, and the values of the resolutions are given,
Most
natural biomolecules may exist in either of two enantiomeric
forms. Although in nature, amino acid biopolymers are characterized
by l-type homochirality, incorporation of d-amino
acids in the design of self-assembling peptide motifs has been shown
to significantly alter enzyme stability, conformation, self-assembly
behavior, cytotoxicity, and even therapeutic activity. However, while
functional metabolite assemblies are ubiquitous throughout nature
and play numerous important roles including physiological, structural,
or catalytic functions, the effect of chirality on the self-assembly
nature and function of single amino acids is not yet explored. Herein,
we investigated the self-assembly mechanism of amyloid-like structure
formation by two aromatic amino acids, phenylalanine (Phe) and tryptophan
(Trp), both previously found as extremely important for the nucleation
and self-assembly of aggregation-prone peptide regions into functional
structures. Employing d-enantiomers, we demonstrate the critical
role that amino acid chirality plays in their self-assembly process.
The kinetics and morphology of pure enantiomers is completely altered
upon their coassembly, allowing to fabricate different nanostructures
that are mechanically more robust. Using diverse experimental techniques,
we reveal the different molecular arrangement and self-assembly mechanism
of the dl-racemic mixtures that resulted in the formation
of advanced supramolecular materials. This study provides a simple
yet sophisticated engineering model for the fabrication of attractive
materials with bionanotechnological applications.
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