The extent to which T(2) relaxation measurements can be used to determine biofouling in several natural geological sand media using a low-field (275 kHz, 6.5 mT) NMR system has been demonstrated. It has been previously shown that, at high laboratory strength fields (300 MHz, 7 T), T(2) techniques can be used as a bioassay to confirm the growth of biofilm inside opaque porous media with low magn...

SCOPE The application of high-throughput 1H nuclear magnetic resonance (1H-NMR) of unpurified extracts to determine genetic diversity and the contents of polar components in grain of wheat. METHODS AND RESULTS Milled whole wheat grain was extracted with 80:20 D2 O:CD3 OD containing 0.05% d4 -trimethylsilylpropionate. 1H-NMR spectra were acquired under automation at 300°K using an Avance Spect...

The nitrovanillin azine (NA) has been successfully synthesized and examined as a colorimetric chemosensor for sulfide anion detection. NA was using two steps reaction. Vanillin reacted with concentrated nitric acid to form 5-nitrovanillin (NV) then the NV condensed hydrazine hydrate produce NA. obtained fully elucidated by FTIR, 1H-NMR, 13C-NMR, GC-MS spectrometer. activity anionic carried out ...

PURPOSE To study biochemical response of living model of glioma to X-rays irradiation using high resolution proton nuclear magnetic resonance (1H NMR) spectroscopy. MATERIAL AND METHODS Rat glioma C6 cells were irradiated with 3.8 Gy (D0, the 37% clonogenic survival dose) of X-rays from a teletherapy unit at the dose rate 8.8 Gy/min. After irradiation the cells were incubated at 37°C/5%CO2/95...

The NMR response of a polymeric fluid to the application of shear field has been studied by using specially designed shearing devices conforming to a couette geometry. We show that an airdriven high-resolution liquids sample spinning arrangement, available on any high-resolution liquidstate NMR spectrometer, is easily adapted to set up a couette cell and impart shear rates (γ̆) of ca. 18450 s-1 ...

Reaction monitoring is widely used to follow chemical processes in a broad range of application fields. Recently, the development of robust benchtop NMR spectrometers has brought NMR under the fume hood, making it possible to monitor chemical reactions in a safe and accessible environment. However, these low-field NMR approaches suffer from limited resolution leading to strong peak overlaps, wh...

We report the experimental realization of BOOMERANG (better observation of magnetization, enhanced resolution, and no gradient), a sensitive and general method of magnetic resonance. The prototype millimeter-scale NMR spectrometer shows signal and noise levels in agreement with the design principles. We present 1H and 19F NMR in both solid and liquid samples, including time-domain Fourier trans...

Here we present a novel suite of projected 4D triple-resonance NMR experiments for efficient sequential assignment of polypeptide backbone chemical shifts in 13C/15N doubly labeled proteins. In the 3D HNN[CAHA] and 3D HNN(CO)[CAHA] experiments. the 13C(alpha) and lHalpha chemical shifts evolve in a common dimension and are simultaneously detected in quadrature. These experiments are particularl...

A novel nano-initiator containing kojic acid moiety, [5-(benzyloxy)-4-oxo-4H-pyran-2-yl)methyl-2-bromo-2-methylpropanoate was synthesized by the reaction of 5-(benzyloxy)-2-(hydroxymethyl)-4H-pyran-4-one with 2-bromoisobutyryl bromide in triethylamine and used as initiator in the atom transfer radical polymerization (ATRP) of styrene and methyl methacrylate in the presence of Cu(0)/CuCl2and N,N...

Proton nuclear magnetic resonance ((1)H NMR) spectra of leaves from 50 plant species were obtained at a spectrometer frequency of 470 MHz. Water present in leaf samples gives rise to characteristic spectral patterns. Most species show only one broad (1)H NMR peak; however, the leaves of some plants display complex, orientation-dependent spectra in which a common three-line pattern is discerned....