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Nuclear magnetic resonance spectroscopy for selective detection of multiple quantum transitions
S/wrrochwnicu Ado. Vol. 43A. No. 5, pp. I-11, 1987. Pergamon Journals Ltd. Printed in Great Bntam.
NEW PATENTS This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH” online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4626783 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY FOR SELECTIVE DETECTION OF MULTIPLE QUANTUM TRANSITIONS Muneki
JEOL
Ohuchi,
Tokyo,
Japan
assigned
to
Ltd
The present invention relates to an improved nuclear magnetic resonance spectroscopy for selectively detecting multiple quantum transitions of a selected order, the transitions taking place in a sample containing a system of rotating magnetic resonators. The spectrometry comprises the steps of: (a) applying a pulse train to the resonators, the pulse train consisting of RF pulses in which at least one pulse is phi degrees out of phase with the last pulse; (b) detecting the free induction decay signal emanating from the resonators for a period of time t2 after the application of the pulse train, using two channels of detecting system which are 90 degrees out of phase with each other, and storing it in a memory. The steps are repeated changing the values of the evolution time tl, resetting the values of phi, and adding 90 degrees, 180 degrees, and 270 degrees to all values of phi. The data are combined and converted to frequency domain by double Fourier transformation with respect to tl and t2.
4627014 METHOD AND APPARATUS FOR DETERMINATION OF AN ANALYTE AND METHOD OF CALIBRATING SUCH APPARATUS Donald H Lo, Tai-Wing Wu, Mark W Bailey assigned to Eastman Kodak Company
A method and apparatus are described for the determination of an analyte in an aqueous liquid while eliminating the biasing effect of unknown interferents which are preformed or formed in situ during the determination. The method comprises physically contacting a sample of the liquid with an interactive composition for the the spectrophotometric analyte; measuring responses generated by such contact at a primary wavelength lambda 1 and one or more secondary wavelengths lambda2, lambda3, . . lambdan; and determining analyte concentration or activity using the equation: See Patent for Tubular Presentation PS wherein C is analyte concentration or activity, Al, A2, . An are the spectrophotometric responses observed at lambdal, lambda2, . . . lambdan, respectively; and a0, al, and alphal, alpha2, . alphan-l are constants determined according to a calibrating method, also described herein. Such calibrating method is an empirical means for determining and recording in a chemical analyzer the a0, al, and alphal, alpha2, . . alphan- 1 constants essential for making the analyte determination.
4628263 NUCLEAR MAGNETIC RESONANCE SPECTROMETER Jun Kida, Tokyo,
Japan
assigned
to Jeol Ltd
A nuclear magnetic resonance spectrometer includes a device for sensing the angular position of the sample tube and a device for adding up the free induction decay signals. The RF pulses are applied to the sample according to the output signal from the sensing device when a certain location of the sample tube is at a first specific position and also when the certain location is at a second position diametrically opposite to the first position. The two free induction decay signals obtained in this way are added up by the adding device to prevent occurrence of peaks,
NEW PATENTS This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH” online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4626783 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY FOR SELECTIVE DETECTION OF MULTIPLE QUANTUM TRANSITIONS Muneki
JEOL
Ohuchi,
Tokyo,
Japan
assigned
to
Ltd
The present invention relates to an improved nuclear magnetic resonance spectroscopy for selectively detecting multiple quantum transitions of a selected order, the transitions taking place in a sample containing a system of rotating magnetic resonators. The spectrometry comprises the steps of: (a) applying a pulse train to the resonators, the pulse train consisting of RF pulses in which at least one pulse is phi degrees out of phase with the last pulse; (b) detecting the free induction decay signal emanating from the resonators for a period of time t2 after the application of the pulse train, using two channels of detecting system which are 90 degrees out of phase with each other, and storing it in a memory. The steps are repeated changing the values of the evolution time tl, resetting the values of phi, and adding 90 degrees, 180 degrees, and 270 degrees to all values of phi. The data are combined and converted to frequency domain by double Fourier transformation with respect to tl and t2.
4627014 METHOD AND APPARATUS FOR DETERMINATION OF AN ANALYTE AND METHOD OF CALIBRATING SUCH APPARATUS Donald H Lo, Tai-Wing Wu, Mark W Bailey assigned to Eastman Kodak Company
A method and apparatus are described for the determination of an analyte in an aqueous liquid while eliminating the biasing effect of unknown interferents which are preformed or formed in situ during the determination. The method comprises physically contacting a sample of the liquid with an interactive composition for the the spectrophotometric analyte; measuring responses generated by such contact at a primary wavelength lambda 1 and one or more secondary wavelengths lambda2, lambda3, . . lambdan; and determining analyte concentration or activity using the equation: See Patent for Tubular Presentation PS wherein C is analyte concentration or activity, Al, A2, . An are the spectrophotometric responses observed at lambdal, lambda2, . . . lambdan, respectively; and a0, al, and alphal, alpha2, . alphan-l are constants determined according to a calibrating method, also described herein. Such calibrating method is an empirical means for determining and recording in a chemical analyzer the a0, al, and alphal, alpha2, . . alphan- 1 constants essential for making the analyte determination.
4628263 NUCLEAR MAGNETIC RESONANCE SPECTROMETER Jun Kida, Tokyo,
Japan
assigned
to Jeol Ltd
A nuclear magnetic resonance spectrometer includes a device for sensing the angular position of the sample tube and a device for adding up the free induction decay signals. The RF pulses are applied to the sample according to the output signal from the sensing device when a certain location of the sample tube is at a first specific position and also when the certain location is at a second position diametrically opposite to the first position. The two free induction decay signals obtained in this way are added up by the adding device to prevent occurrence of peaks,