Introduction The value of measuring such nuclear magnetic resonance parameters as longitudinal and transverse relaxation times, and nuclear Overhauser effect enhancement factors has already been demonstrated [1]. While most modern Fourier Transform (FT) NMR spectrometers are fitted with the appropriate pulse sequence capabilities, they generally only provide a linear semi-10garithmic least-squa...

STUDY DESIGN Research OBJECTIVE.: The goal of this study was to investigate whether P. acnes infection of the intervertebral disc can be detected noninvasively by NMR spectroscopy. SUMMARY OF BACKGROUND DATA Microbiological studies of surgical samples suggest that a significant subpopulation of back pain patients may have occult disc infection with P. acnes bacteria. This hypothesis is furthe...

Individual low molecular weight heparins (LMWHs) exhibit distinct pharmacological and biochemical profiles because of manufacturing differences. Correlation of biological properties with particular structural motifs is a major challenge in the design of new LMWHs as well as in the development of generic versions of proprietary LMWHs. Two-dimensional nuclear magnetic resonance (NMR) spectroscopy...

The previously observed improvement in spectral resolution of tissue proton NMR with high-resolution magic angle spinning (HRMAS) was speculated to be due largely to freeze-thawing artifacts resulting from tissue storage. In this study, 12 human prostate samples were analyzed on a 14.1T spectrometer at 3 degrees C, with HRMAS rates of 600 and 700 Hz. These samples were measured fresh and after ...

Particulate matter was measured during August and September of 2006 in Houston as part of the Texas Air Quality Study II Radical and Aerosol Measurement Project. Aerosol size and composition were determined using an Aerodyne quadrupole aerosol mass spectrometer. Aerosol was dominated by sulfate (4.1 2.6 mg m 3) and organic material (5.5 4.0 mg m 3), with contributions of organic material from b...

A new simulation program for multinuclear NMR is introduced. PJNMR (Pure Java NMR) 2.0, written entirely in the Java programming language, simulates pulse sequences on systems of up to three weakly coupled spins-1/2 with a command-driven, spectrometer-like interface. Users may simulate the effects of pulses, precessions, and pulsed field gradients on the spin system, with a graphical display sh...

Dynamic Nuclear Polarization (DNP) experiments transfer polarization from electron spins to nuclear spins with microwave irradiation of the electron spins for enhanced sensitivity in nuclear magnetic resonance (NMR) spectroscopy. Design and testing of a spectrometer for magic angle spinning (MAS) DNP experiments at 263 GHz microwave frequency, 400 MHz (1)H frequency is described. Microwaves are...

Parahydrogen is demonstrated to efficiently transfer its nuclear spin hyperpolarization to nitrogen-15 in pyridine and nicotinamide (vitamin B(3) amide) by conducting "signal amplification by reversible exchange" (SABRE) at microtesla fields within a magnetic shield. Following transfer of the sample from the magnetic shield chamber to a conventional NMR spectrometer, the (15)N NMR signals for t...