Parts-per-million level loading organocatalysed enantioselective silylation of alcohols

Parts-per-million level loading organocatalysed enantioselective silylation of alcohols.

The field of organocatalysis has blossomed over the past few decades, becoming an alternative to transition-metal catalysis or even replacing the realm of transition-metal catalysis. However, a truly powerful organocatalyst with a high turnover number (TON) and turnover frequency (TOF) while retaining high enantioselectivity is yet to be discovered. Similar to metal catalysis, extremely low cat...

The linear polarization of nearby bright stars measured at the parts per million level

We report observations of the linear polarization of a sample of 49 nearby bright stars measured to sensitivities of between ∼1 and ∼4 ×10. The majority of stars in the sample show measurable polarization, but most polarizations are small with 75% of the stars having P < 2 ×10. Correlations of the polarization with distance and position, indicate that most of the polarization is of interstellar...

Selective monitoring of parts per million levels of CO by covalently immobilized metal complexes on glass.

Optical detection of parts-per-million (ppm) levels of CO by a structurally well-defined monolayer consisting of bimetallic rhodium complexes on glass substrates has been demonstrated.

Parts-per-million of polyethylene glycol as a non-interfering blocking agent for homogeneous biosensor development.

Many homogeneous assays are complicated by the adsorption of probe molecules by the surface of reaction vessels, which are often made of polypropylene or polystyrene-based plastics. To solve this problem, many protein and surfactant-based blocking agents are used. However, these blockers may interfere with intended assays by sequestering transition-metal ions, inducing protein denaturing, gener...

ZnO functionalization of multiwalled carbon nanotubes for methane sensing at single parts per million concentration levels