GLORIA — GEOMAR Library Ocean Research Information Access

1

Digitale Medien

Interactions of magnetic resonance imaging radio frequency magnetic fields with elongated medical implants (2000)

Smith, Chris D. ; Kildishev, Alexander V. ; Nyenhuis, John A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 6188-6190

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Magnetic resonance imaging (MRI) is a well established diagnostic technique, one from which all patients should be able to benefit, including those with implanted medical devices. This paper describes an experimental and numerical study of the temperature rise near the ends of wires by the radio frequency (rf) field in MRI. These wires simulate long wires which may be part of a medical implant. Temperature rise as a function of time was measured for wires of different lengths and diameters in a phantom exposed to the 64 MHz rf field inside a MRI body coil. For wires with no or thin insulation, the maximal rise was about seven times background for a wire length of 20 cm; wires with longer and shorter lengths exhibited less temperature rise. The temperature rise was greater for wires with thicker insulation. Computer simulations using a quasistatic model are in reasonable agreement with the measurements on shorter wires. It is concluded that medical implants with long conducting lead wires may result in potentially unsafe temperature rise during MRI imaging. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.372651

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2

Digitale Medien

Editorial (2004)

Smith, Chris

Oxford, UK : Blackwell Science Ltd

International journal of food science & technology 39 (2004), S. 0

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ISSN: 1365-2621

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.2004.00848.x

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3

Digitale Medien

The comings and goings of a Y polymorphism (2003)

Tyler-Smith, Chris ; McVean, Gil

[s.l.] : Nature Publishing Group

Nature genetics 35 (2003), S. 201-202

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ISSN: 1546-1718

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Medizin

Notizen: [Auszug] For a chromosome whose evolutionary future has been doubted, the human Y is not doing much to help itself. Roughly 5–10% of men suffer from infertility, which can be attributed to deletions of the AZF (azoospermia factor) regions in 1% of cases. AZFc deletions alone occur in 1 of 4,000 men. ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/ng1103-201

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4

Digitale Medien

Photonics On the threshold of success (2000)

Smith, Chris ; De La Rue, Richard

[s.l.] : Macmillan Magazines Ltd.

Nature 408 (2000), S. 653-655

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Photonic crystals occur naturally as semiprecious opal and the microscopic structures on the wings of some tropical butterflies. They are repeating structures that inhibit the propagation of some frequencies of light. They often produce brilliant colour effects by selecting narrow parts of the ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/35047196

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5

Digitale Medien

A neocentromere in the DAZ region of the human Y chromosome (2000)

Floridia, Giovanna ; Gimelli, Giorgio ; Zuffardi, Orsetta ; [weitere]

Springer

Chromosoma 109 (2000), S. 318-327

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ISSN: 1432-0886

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Abstract. We describe a novel rearranged human Y chromosome consisting of an inverted duplication of the long arm heterochromatin and a small amount of euchromatin: rea(Y)(qter–q11.2::q11.2–qter). The normal centromere has been deleted and a neocentromere containing CENP-A, -C, -E and Mad2 but not CENP-B has formed close to the breakpoint. A 2.7 Mb yeast artificial chromosome contig spanning the breakpoint was constructed and the breakpoint was localised to a region of 〈120 kb close to the DAZ gene cluster. Combined immunofluorescence and fluorescence in situ hybridisation showed that the centromeric protein-binding domain of the neocentromere was located near the breakpoint and within the DAZ cluster.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s004120000081

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