Removing acoustic ringing baseline curvature in C NMR spectra for quantitative analyses.

C nuclear magnetic resonance (NMR) is traditionally considered an insensitive technique, requiring long acquisition times to measure dilute functionalities on large polymers. With the introduction of cryoprobes and better electronics, sensitivity has improved in a way that allows measurements to take less than 1/20th the time that they previously did. Unfortunately, a high Q-factor with cryoprobes creates baseline curvature related to acoustic ringing that affects quantitative NMR analyses.

Polyolefin Analyses with a 10 mm Multinuclear NMR Cryoprobe.

Polyolefins are important and broadly used materials. Their molecular microstructures have direct impact on macroscopic properties and dictate end-use applications. C NMR is a powerful analytical technique used to characterize polyolefin microstructures, such as long-chain branching (LCB), but it suffers from low sensitivity.

Simultaneous In Situ Monitoring of Trimethoxysilane Hydrolysis Reactions Using Raman, Infrared, and Nuclear Magnetic Resonance (NMR) Spectroscopy Aided by Chemometrics and Ab Initio Calculations.

Sol-gels are found in many different scientific fields and have very broad applications. They are often prepared by the hydrolysis and condensation of alkoxysilanes such as trimethoxysilanes, which are commonly used as precursors in the preparation of silsequioxanes via the sol-gel process. The reaction rates of such reactions are influenced by a wide range of experimental factors such as temperature, pH, catalyst, etc.

Studies on the Activation and Hydrosilylation Catalysis of RhCl(BuS).

RhCl(BuS) is an industrial precatalyst utilized in the curing of some solventless silicone-release coatings formulations. The catalyst requires no additional inhibitor, in contrast to typical Pt formulations, and so questions arose about how fast the catalyst could trigger curing if it were used in a more activated form. Studies on the activation of RhCl(BuS) revealed multiple intermediates, of which [RhCl(BuS)] and [RhHCl(SiMe(OSiMe)) (BuS)] were isolated.

Treatment of acute atopic eczema by chiropractic care. A case study.

Objective: To investigate a patient with atopic eczema and assess how they responded to chiropractic care.

Method: The study was run over a 7 week period with chiropractic treatments (diversified technique) on a once weekly schedule.

Outcome Measures: To measure the effect of treatment, a rating system was developed and the intensity of a range of symptoms was recorded (through a questionnaire) on a twice weekly basis.