ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Resurrection of crushed magnetization and chaotic dynamics in solution NMR spectroscopy (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-06
    Description: We show experimentally and theoretically that two readily observed effects in solution nuclear magnetic resonance (NMR)-radiation damping and the dipolar field-combine to generate bizarre spin dynamics (including chaotic evolution) even with extraordinarily simple sequences. For example, seemingly insignificant residual magnetization after a crusher gradient triggers exponential regrowth of the magnetization, followed by aperiodic turbulent spin motion. The estimated Lyapunov exponent suggests the onset of spatial-temporal chaos and the existence of chaotic attractors. This effect leads to highly irreproducible experimental decays that amplify minor nonuniformities such as temperature gradients. Imaging applications and consequences for other NMR studies are discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Y Y -- Lisitza, N -- Ahn, S -- Warren, W S -- GM35253/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 6;290(5489):118-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11021793" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Nuclear magnetic resonance. Multidimensional symmetry in a three-dimensional world (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-11-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, W S -- New York, N.Y. -- Science. 2001 Nov 16;294(5546):1475-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Center for Molecular and Biomolecular Imaging, Princeton University, Princeton, NJ 08544, USA. wwarren@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11711662" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Effects of pulse shaping in laser spectroscopy and nuclear magnetic resonance (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-11-11
    Description: Pulsed excitation fields are routinely used in most laser and nuclear magnetic resonance (NMR) experiments. In the NMR case, constant amplitude (rectangular) pulses have traditionally been used; in laser spectroscopy the exact pulse shape is often unknown or changes from shot to shot. This article is an overview of the effects of radio-frequency and laser pulse shapes and the instrumental requirements for pulse shaping. NMR applications to selective excitation, solvent suppression, elimination of phase roll, and reduced power dissipation are discussed, as are optical applications to soliton generation, velocity selective excitation, and quantitative population transfer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, W S -- GM 35253/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Nov 11;242(4880):878-84.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, NJ 08544.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3055299" target="_blank"〉PubMed〈/a〉
    Keywords: *Lasers ; Magnetic Resonance Spectroscopy/*methods ; Optics and Photonics ; Spectrum Analysis/*methods
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    MR imaging contrast enhancement based on intermolecular zero quantum coherences (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-07-10
    Description: A new method for magnetic resonance imaging (MRI) based on the detection of relatively strong signal from intermolecular zero-quantum coherences (iZQCs) is reported. Such a signal would not be observable in the conventional framework of magnetic resonance; it originates in long-range dipolar couplings (10 micrometers to 1 millimeter) that are traditionally ignored. Unlike conventional MRI, where image contrast is based on variations in spin density and relaxation times (often with injected contrast agents), contrast with iZQC images comes from variations in the susceptibility over a distance dictated by gradient strength. Phantom and in vivo (rat brain) data confirm that iZQC images give contrast enhancement. This contrast might be useful in the detection of small tumors, in that susceptibility correlates with oxygen concentration and in functional MRI.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, W S -- Ahn, S -- Mescher, M -- Garwood, M -- Ugurbil, K -- Richter, W -- Rizi, R R -- Hopkins, J -- Leigh, J S -- GM35253/GM/NIGMS NIH HHS/ -- RR02305/RR/NCRR NIH HHS/ -- RR08079/RR/NCRR NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1998 Jul 10;281(5374):247-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, Princeton, NJ 08544-1009, USA. wwarren@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9657717" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*anatomy & histology/physiology ; Brain Mapping ; Brain Neoplasms/*pathology ; Magnetic Resonance Imaging/*methods ; Magnetics ; Mathematics ; Phantoms, Imaging ; Rats
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Laser-enhanced NMR spectroscopy (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-04-06
    Description: Experimental studies show that optical irradiation far from any absorption bands can shift the resonances in a nuclear magnetic resonance (NMR) spectrum without significant heating. This effect may lead to increased dispersion in NMR studies of complex molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, W S -- Mayr, S -- Goswami, D -- West, A P Jr -- New York, N.Y. -- Science. 1992 Mar 27;255(5052):1683-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, NJ 08544-1009.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1553555" target="_blank"〉PubMed〈/a〉
    Keywords: Camphor/chemistry ; Lasers ; Magnetic Resonance Spectroscopy/*instrumentation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    Accurate temperature imaging based on intermolecular coherences in magnetic resonance (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-10-18
    Description: Conventional magnetic resonance methods that provide interior temperature profiles, which find use in clinical applications such as hyperthermic therapy, can develop inaccuracies caused by the inherently inhomogeneous magnetic field within tissues or by probe dynamics, and work poorly in important applications such as fatty tissues. We present a magnetic resonance method that is suitable for imaging temperature in a wide range of environments. It uses the inherently sharp resonances of intermolecular zero-quantum coherences, in this case flipping up a water spin while flipping down a nearby fat spin. We show that this method can rapidly and accurately assign temperatures in vivo on an absolute scale.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3080759/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3080759/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galiana, Gigi -- Branca, Rosa T -- Jenista, Elizabeth R -- Warren, Warren S -- EB2122/EB/NIBIB NIH HHS/ -- EB5979/EB/NIBIB NIH HHS/ -- R01 EB002122/EB/NIBIB NIH HHS/ -- R01 EB002122-22A2/EB/NIBIB NIH HHS/ -- New York, N.Y. -- Science. 2008 Oct 17;322(5900):421-4. doi: 10.1126/science.1163242.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18927389" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Body Temperature ; Lipids ; Magnetic Resonance Imaging/*methods ; Mice ; Mice, Obese ; *Temperature ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Increasing hyperpolarized spin lifetimes through true singlet eigenstates (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-03-28
    Description: The sensitivity limitations for magnetic resonance imaging of organic molecules have recently been addressed by hyperpolarization methods, which prepare excess nuclear spin polarization. This approach can increase sensitivity by orders of magnitude, but the enhanced signal relaxes away in tens of seconds, even in favorable cases. Here we show theoretically that singlet states between strongly coupled spins in molecules can be used to store and retrieve population in very-long-lived disconnected eigenstates, as long as the coupling between the spins substantially exceeds both the couplings to other spins and the resonance frequency difference between them. Experimentally, 2,3-carbon-13-labeled diacetyl has a disconnected eigenstate that can store population for minutes and is read out by hydration to make the two spins inequivalent.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3080756/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3080756/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, Warren S -- Jenista, Elizabeth -- Branca, Rosa Tamara -- Chen, Xin -- EB02122/EB/NIBIB NIH HHS/ -- R01 EB002122/EB/NIBIB NIH HHS/ -- R01 EB002122-22A2/EB/NIBIB NIH HHS/ -- New York, N.Y. -- Science. 2009 Mar 27;323(5922):1711-4. doi: 10.1126/science.1167693.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Center for Molecular and Biomolecular Imaging, Duke University, Durham, NC 27708, USA. warren.warren@duke.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19325112" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Isotopes ; Chemical Phenomena ; Diacetyl/*analysis/chemistry ; Magnetic Resonance Imaging ; *Magnetic Resonance Spectroscopy ; Magnetics ; Molecular Structure ; *Nuclear Magnetic Resonance, Biomolecular ; Sensitivity and Specificity
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Femtosecond phase-coherent two-dimensional spectroscopy (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-06-07
    Description: Femtosecond phase-coherent two-dimensional (2D) spectroscopy has been experimentally demonstrated as the direct optical analog of 2D nuclear magnetic resonance. An acousto-optic pulse shaper created a collinear three-pulse sequence with well-controlled and variable interpulse delays and phases,which interacted with a model atomic system of rubidium vapor. The desired nonlinear polarization was selected by phase cycling (coadding experimental results obtained with different interpulse phases). This method may enhance our ability to probe the femtosecond structural dynamics of macromolecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tian, Peifang -- Keusters, Dorine -- Suzaki, Yoshifumi -- Warren, Warren S -- New York, N.Y. -- Science. 2003 Jun 6;300(5625):1553-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Electrical Engineering, Center of Ultrafast Laser Applications, Princeton University, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12791987" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry, Physical ; Fourier Analysis ; Lasers ; Magnetic Resonance Spectroscopy/methods ; Mathematics ; *Molecular Structure ; Optics and Photonics ; Photons ; Physicochemical Phenomena ; Rubidium ; Spectrum Analysis/*methods ; Time Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Imaging with intermolecular multiple-quantum coherences in solution nuclear magnetic resonance (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-02-03
    Description: A magnetic resonance imaging technique based on intermolecular multiple-quantum coherences in solution (the correlated spectroscopy revamped by asymmetric z gradient echo detection or CRAZED experiment) is described here. Correlations between spins in different molecules were detected by magnetic-field gradient pulses. In order for a correlation to yield an observable signal, the separation between the two spins must be within a narrow band that depends on the area of the gradient pulses. The separation can be tuned from less than 10 micrometers to more than 1 millimeter, a convenient range for many applications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richter, W -- Lee, S -- Warren, W S -- He, Q -- GM35253/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1995 Feb 3;267(5198):654-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, NJ 08544.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7839140" target="_blank"〉PubMed〈/a〉
    Keywords: Acetone/chemistry ; Benzene/chemistry ; Magnetic Resonance Spectroscopy/*methods ; Mathematics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Homogeneous NMR spectra in inhomogeneous fields (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-04-05
    Description: Researchers interested in high-resolution nuclear magnetic resonance (NMR) spectroscopy have long sought higher magnetic fields to enhance resolution and simplify spectra. Magnets with substantially larger fields than those available in the best commercial spectrometers are available, but the inhomogeneity is unacceptable for high-resolution spectra. A detection method (termed HOMOGENIZED) is presented that removes inhomogeneity while retaining chemical shift differences and J couplings. With existing inhomogeneous magnets, this method could nearly double the largest resonance frequency available for high-resolution NMR. The HOMOGENIZED sequence is based on observations of intermolecular zero-quantum coherences between a solute molecule and solvent molecules that are micrometers away; as long as the field is homogeneous over this short distance, sharp resonances are recovered without echoes. Experimental demonstrations and a detailed density matrix theory to explain the effect are presented.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vathyam, S -- Lee, S -- Warren, W S -- GM35253/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Apr 5;272(5258):92-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8600541" target="_blank"〉PubMed〈/a〉
    Keywords: Aprotinin/chemistry ; Magnetic Resonance Spectroscopy/*methods ; Mathematics ; Proteins/chemistry ; Solvents
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...