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Grafström S, Suter D. Wall relaxation of spin-polarized sodium measured by reflection spectroscopy. OPTICS LETTERS 1995; 20:2134-2136. [PMID: 19862275 DOI: 10.1364/ol.20.002134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Using reflection spectroscopy of optically pumped sodium vapor, we have performed what is to our knowledge the first direct measurement of the spatially inhomogeneous spin polarization near a glass surface. On the basis of a theoretical description of the reflection at an inhomogeneous, anisotropic medium, we deduce the magnitude of the small residual magnetization at the surface from an analysis of the optical line shape. This allows us to specify the depolarizing properties of the surface.
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102
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Blasberg T, Suter D. Interference of scattering pathways in Raman heterodyne spectroscopy of multilevel atoms. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12439-12450. [PMID: 9978013 DOI: 10.1103/physrevb.51.12439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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103
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Blasberg T, Suter D. Bichromatic excitation of coherent Raman beats in rare-earth solids. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6309-6318. [PMID: 9977169 DOI: 10.1103/physrevb.51.6309] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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104
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Suter D. "Weak measurements" and the "quantum time-translation machine" in a classical system. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 51:45-49. [PMID: 9911553 DOI: 10.1103/physreva.51.45] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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105
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Röhricht B, Eschle P, Wigger C, Dangel S, Holzner R, Suter D. Large frequency shifts of absorption profiles due to the combination of optical pumping, light shift, and magnetic fields in sodium vapor. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:2434-2437. [PMID: 9911161 DOI: 10.1103/physreva.50.2434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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106
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Blasberg T, Suter D. Nuclear spin relaxation of Pr 3+ in YAlO 3 . A temperature-dependent optical-rf double-resonance study. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)89375-r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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107
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Suter D, Blasberg T. Stabilization of transverse solitary waves by a nonlocal response of the nonlinear medium. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:4583-4587. [PMID: 9910164 DOI: 10.1103/physreva.48.4583] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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108
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Suter D, Marty T. Coherent Raman beats: high-order interference effects. OPTICS LETTERS 1993; 18:1663-1665. [PMID: 19823479 DOI: 10.1364/ol.18.001663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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109
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Blasberg T, Suter D. Determination of the absolute sign of nuclear quadrupole interactions by laser radio-frequency double-resonance experiments. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:9524-9527. [PMID: 10007194 DOI: 10.1103/physrevb.48.9524] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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110
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Suter D, Marty T, Klepel H. Rotation properties of multipole moments in atomic sublevel spectroscopy. OPTICS LETTERS 1993; 18:531-533. [PMID: 19802191 DOI: 10.1364/ol.18.000531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The spatial orientation of atomic multipole moments can be observed optically with resonant polarized light. We demonstrate the procedure in the ground state of atomic sodium, using optical pumping to polarize the angular momentum substates. We show how the resulting information can be used to distinguish among signal contributions originating from different multipole moments.
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111
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Blasberg T, Suter D. Displacement of a laser beam by a precessing magnetic dipole. PHYSICAL REVIEW LETTERS 1992; 69:2507-2510. [PMID: 10046512 DOI: 10.1103/physrevlett.69.2507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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112
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Suter D. Optically excited Zeeman coherences in atomic ground states: Nuclear-spin effects. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:344-350. [PMID: 9907869 DOI: 10.1103/physreva.46.344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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113
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Suter D, Klepel H, Mlynek J. Time-resolved two-dimensional spectroscopy of optically driven atomic sublevel coherences. PHYSICAL REVIEW LETTERS 1991; 67:2001-2004. [PMID: 10044310 DOI: 10.1103/physrevlett.67.2001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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114
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Suter D, Rosatzin M, Mlynek J. Optically induced coherence transfer echoes between Zeeman substates. PHYSICAL REVIEW LETTERS 1991; 67:34-37. [PMID: 10044045 DOI: 10.1103/physrevlett.67.34] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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115
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Suter D, Mlynek J. Dynamics of atomic sublevel coherences during modulated optical pumping. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:6124-6134. [PMID: 9904947 DOI: 10.1103/physreva.43.6124] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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116
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Rosatzin M, Suter D, Mlynek J. Light-shift-induced spin echoes in a J=1/2 atomic ground state. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:1839-1841. [PMID: 9904231 DOI: 10.1103/physreva.42.1839] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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117
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Suter D, Rosatzin M, Mlynek J. Optically driven spin nutations in the ground state of atomic sodium. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:1634-1644. [PMID: 9903262 DOI: 10.1103/physreva.41.1634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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118
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Elsner J, Suter D, Alder S. Microanalysis of ultrasound vocalizations of young rats: assessment of the behavioral teratogenicity of methylmercury. Neurotoxicol Teratol 1990; 12:7-14. [PMID: 2314362 DOI: 10.1016/0892-0362(90)90106-m] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An on-line real-time computer system for the analysis of ultrasound vocalizations of rats is presented. The calls of young rats are recorded by an ultrasound microphone, transformed by an amplitude envelope and a frequency to voltage converter, digitized and stored by a microcomputer. The data management and analysis of the recorded vocalizations are entirely automated, allowing a high throughput of experiments in a routine laboratory. The frequency values are analyzed with respect to number, duration, base-interval, and mean frequency of the calls. Also, the frequency distributions of the call to call intervals, the call durations and the ultrasound frequencies, as well as the power spectra of the frequency modulations, are calculated. This system was used for the assessment of the behavioral teratogenicity of methylmercury chloride. Wistar rat dams were treated with 0, 1.5 or 5 mg/l in their drinking water from two weeks prior to pairing until the end of the experiment. The ultrasound vocalizations of two female and two male offspring per litter were recorded on days 5, 7, 9, 11, 13, and 15 for one minute in a clean glass beaker cooled to 20 degrees C. Methylmercury treatment resulted in a developmental delay and an overall reduction in the number of calls, a shortening of the base-interval and the call durations, a flattening and shift of the frequency distributions, and an alteration in the development with age of the frequency distributions. The frequency modulations of the calls also differed, their power being lower (smaller frequency variation) on several occasions.
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119
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Suter D, Bartroli A, Schneider F, Rippin D, Newson E. Radial flow reactor optimization for highly exothermic selective oxidation reactions. Chem Eng Sci 1990. [DOI: 10.1016/0009-2509(90)80092-s] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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120
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Egli C, Th�er M, Suter D, Cook AM, Leisinger T. Monochloro- and dichloroacetic acids as carbon and energy sources for a stable, methanogenic mixed culture. Arch Microbiol 1989. [DOI: 10.1007/bf00409654] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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121
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Jarvie T, Takegoshi K, Suter D, Pines A, Zax D. Suppression of the zero frequency peak in zero field NMR. Chem Phys Lett 1989. [DOI: 10.1016/0009-2614(89)87345-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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122
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Suter D, Mueller KT, Pines A. Study of the Aharonov-Anandan quantum phase by NMR interferometry. PHYSICAL REVIEW LETTERS 1988; 60:1218-1220. [PMID: 10037978 DOI: 10.1103/physrevlett.60.1218] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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123
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Suter D, Pearson J. Experimental classification of multi-spin coherence under the full rotation group. Chem Phys Lett 1988. [DOI: 10.1016/0009-2614(88)87123-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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124
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125
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126
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Suter D, Jarvie TP, Sun B, Pines A. Observation of spin diffusion in zero-field magnetic resonance. PHYSICAL REVIEW LETTERS 1987; 59:106-108. [PMID: 10035114 DOI: 10.1103/physrevlett.59.106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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127
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Schenker K, Suter D, Pines A. Broadband heteronuclear decoupling in the presence of homonuclear dipolar and quadrupolar interactions. ACTA ACUST UNITED AC 1987. [DOI: 10.1016/0022-2364(87)90228-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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128
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Suter D, Schenker K, Pines A. Theory of broadband heteronuclear decoupling in multispin systems. ACTA ACUST UNITED AC 1987. [DOI: 10.1016/0022-2364(87)90227-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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129
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130
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Suter D, Pines A, Mehring M. Indirect phase detection of NMR spinor transitions. PHYSICAL REVIEW LETTERS 1986; 57:242-244. [PMID: 10033757 DOI: 10.1103/physrevlett.57.242] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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131
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Levitt MH, Suter D, Ernst RR. Spin dynamics and thermodynamics in solid‐state NMR cross polarization. J Chem Phys 1986. [DOI: 10.1063/1.450046] [Citation(s) in RCA: 205] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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132
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Kreis R, Suter D, Ernst R. Radiofrequency-pulse excitation in time-domain zero-field magnetic resonance. Chem Phys Lett 1986. [DOI: 10.1016/0009-2614(86)80004-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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133
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Suter D, Ernst RR. Spin diffusion in resolved solid-state NMR spectra. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 32:5608-5627. [PMID: 9937807 DOI: 10.1103/physrevb.32.5608] [Citation(s) in RCA: 246] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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134
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Kreis R, Suter D, Ernst R. Time-domain zero-field magnetic resonance with field pulse excitation. Chem Phys Lett 1985. [DOI: 10.1016/0009-2614(85)85281-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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135
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136
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Levitt MH, Suter D, Ernst RR. Composite pulse excitation in three‐level systems. J Chem Phys 1984. [DOI: 10.1063/1.447142] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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137
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Harvey RG, Suter D. Evidence for a major gene effect in the distributions of digital ridge counts. Ann Hum Biol 1983; 10:565-77. [PMID: 6651214 DOI: 10.1080/03014468300006791] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Previous attempts to isolate major gene effects in digital dermatoglyphics have been approached from two main directions. One has been concerned with analysing the components of total ridge count (TRC) distributions and examining various parameters of these distributions. The other has concentrated on the inheritance of various combinations of digital patterns. This study is primarily concerned with the shape of TRC and digital ridge count distributions. It suggests that a major gene effect may be as conspicuous in the distributions of digital counts as it is in TRC if these are viewed from the standpoint of global variation. The relationship between mean TRC, the standard deviation of TRC, skewness and kurtosis is examined and the results are compared with those obtained from a simple major locus model in which the overall distribution of TRC is composed of three overlapping normal distributions. As predicted by the model there is a negative correlation between mean TRC and its standard deviation, also a positive correlation with kurtosis. The expected relationship between mean TRC and skewness is non-linear, taking the form of an asymmetric U-shaped curve. There is evidence that the relationship between mean TRC and g1 in population samples covering a wide range of mean total ridge count follows this trend. The concordance between the predicted relationships and the observed frequency distributions is taken as evidence in favour of a single major locus hypothesis.
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138
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Harvey RG, Suter D. Digital dermatoglyphics of the Faroe Islanders. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 1983; 61:337-45. [PMID: 6614148 DOI: 10.1002/ajpa.1330610308] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Finger dermatoglyphics of 446 male and 463 female Faroe Islanders are described. According to birthplace information for their grandparents the individuals sampled are considered to be representative of all regions of the Faroes. Pattern frequencies are given for individual digits and the tables contain mean radial, ulnar, and unilateral maximal ridge counts. Overall frequencies of patterns and mean total ridge counts in both sexes are compared with other populations in northwestern Europe, several of which have had close historical connections with the Faroes. The Faroese have exceptionally high frequencies of arch and ulnar loop patterns, making their mean pattern intensity index values among the lowest in Europe. Low mean total ridge counts are also characteristic of this population. Icelanders show closer dermatoglyphic resemblance to the Faroese than any other European populations. Low mean total ridge counts among Shetland and Orkney Islanders are noteworthy, and it is possible that the resemblance between these North Atlantic island populations is due to common ancestry arising from Viking settlement during the 8th and 9th centuries. The operation of random genetic drift on the gene pool of the Faroe Islanders is another factor to be considered when assessing their biological affinities.
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139
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Tills D, Warlow A, Lord JM, Suter D, Kopeć AC, Blumberg BS, Hesser JE, Economidou I. Genetic factors in the population of Plati, Greece. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 1983; 61:145-56. [PMID: 6881317 DOI: 10.1002/ajpa.1330610203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
One-thousand, thirty-eight individuals from Plati, Greece were examined for the following red cell antigens, serum proteins, and red cell enzymes A A1 Ai B H; MNSs Mg Henshaw Nya Mur Vw; CCwcDEeCe; K k Kpa Kpb Jsa Jsb; P1; Lua; Fy1 Fy2; Jka Jkb; Wra; Zt; Vel; Swa; Jensen, Radin, Gerbich, Diego, Gregory, Haptoglobin, Transferrin, Acid phosphatase, Adenylate kinase, Adenosine deaminase, Esterase-D, Glucose-6-phosphate dehydrogenase, Phosphoglucomutase, 6-Phosphogluconate dehydrogenase, Phosphohexose isomerase, Lactate dehydrogenase, Malate dehydrogenase, and Superoxide dismutase. The results are discussed in detail and compared with other Greek and neighbouring populations. Because of the Plati population's long history of residence in the Cappadocian area of Turkey the data have been compared, whenever possible, with results for that region.
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140
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Harvey RG, Suter D. Dermatoglyphic affinities of the Lithuanians. Hum Biol 1983; 55:165-81. [PMID: 6840744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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141
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Suter D. Regression analysis of digital ridge counts on pattern intensity index: a developmental interpretation. Ann Hum Biol 1982; 9:45-56. [PMID: 7065641 DOI: 10.1080/03014468200005481] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Regression analyses of digital ridge counts on pattern intensity index (PII) are performed on data from three populations. The results for two Papua New Guinean populations (608 subjects from Karkar Island and 397 from Lufa sub District) are compared with those for a dermatoglyphically very different population from the Faroe Islands (296 subjects). Digital relationships are examined within each population. Equating the statistical regression of digital ridge counts with the embryological regression of apical volar pads, some biological interpretations of the findings are suggested. The results indicate that developmental fields across the embryological hand interact with genotype to produce digital differences in dermatoglyphic phenotype.
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142
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Macura S, Huang Y, Suter D, Ernst R. Two-dimensional chemical exchange and cross-relaxation spectroscopy of coupled nuclear spins. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0022-2364(81)90037-8] [Citation(s) in RCA: 104] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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143
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Suter D, Harvey RG. A developmental approach to the interpretation of dermatoglyphic data from Papua New Guinea and the Faroe Islands. Ann Hum Biol 1981; 8:161-70. [PMID: 7247345 DOI: 10.1080/03014468100004901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
This study examines the influence of pattern intensity index (PII) on total ridge count (TRC) and the mean ridge count of whorls and ulnar loops. The date are principally finger print ridge counts and pattern types of 1005 Papua New Guineans (608 Waskia speakers from Karkar Island and 397 Yagaria speakers for Lufa sub District). In addition, in order to test whether some of the findings also apply to a dermatoglyphically very different population, data from a sample of 297 Faroe Islanders are analysed. The well known increase in TRC with PII is principally attributed to an increase in the mean ridge count of both whorls and ulnar loops, not as might be supposed to the increase in the proportion of whorls (overall the larger pattern type). The ratio of the larger ridge count to the smaller one provides a measure of whorl symmetry, which appears to increase with PII. The results are interpreted in terms of, and are in support of, the developmental hypothesis of dermatoglyphics reviewed by Mulvihill and Smith (1969).
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144
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Suter D, Chow PY, Martin IC. Maintenance of motility in human spermatozoa by energy derived through oxidative phosphorylation and addition of albumin. Biol Reprod 1979; 20:505-10. [PMID: 454749 DOI: 10.1095/biolreprod20.3.505] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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145
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Abstract
Hair samples from 274 Faroe Islanders (mean age 16.7 years) and 246 Orkney Islanders (mean age 13.5 years) were classified and divided into eight colour categories by matching them to standard samples on the "Haarfarbentafel nach Fischer-Saller". Sex differences in the proportions in each category in both the Faroese (144 males, 130 females) and Orcadians (120 males, 126 females) were tested by x(2) and were not significant. A highly significant difference (1% level) was found in the proportions in the eight categories between the total Faroese and Orcadian samples. The Faroese subjects, despite their higher mean age, have a higher proportion of light-haired individuals. Hair of a "smoky-grey" tone, clearly unrelated to greying with age, and not represented on the Fischer-Saller scale, is reported and was found to be predominantly a feature of Orcadian males. The results for the Faroe and Orkney Islanders are compared with data for other North Atlantic populations.
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146
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Suter D, Brunner G, Ferber E. Subcellular localization of gamma-glutamyltransferase in calf thymocytes. Biochem J 1978; 175:643-7. [PMID: 33659 PMCID: PMC1186114 DOI: 10.1042/bj1750643] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The subcellular localization of gamma-glutamyltransferase in calf thymocytes was investigated and compared with that of alkaline phosphodiesterase I, alkaline nitrophenyl phosphatase, succinate-tetrazolium oxidoreductase (succinate-INT reductase) and lactate dehydrogenase after two different methods of cell disruption and differential centrifugation. Most of the activity was recovered in the crude membrane fractions (43.0%), but significant amounts co-pelleted with the large-granule (mitochondria) fractions (31%). The specific activity of the gamma-glutamyltransferase in the purified plasma membrane was 30-50 times that of the enzyme in the cell homogenate and had a similar subcellular distribution to the plasma-membrane markers, alkaline phosphodiesterase I and alkaline nitrophenyl phosphatase. It was concluded that gamma-glutamyltransferase was primary a plasma-membrane-bound enzyme, and that its location in other subcellular fractions was probably due to their contamination with plasma-membrane vesicles.
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147
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Brunner G, Bauer H, Suter D, Speth V. Artefacts produced during plasma-membrane isolation. I. Cell disruption causes alterations in the structure of the plasma membrane of thymocytes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 1978. [DOI: 10.1016/0005-2736(78)90351-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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148
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Brown-Woodman PD, Mohri H, Mohri T, Suter D, White IG. Mode of action of alpha-chlorohydrin as a male anti-fertility agent. Inhibition of the metabolism of ram spermatozoa by alpha-chlorohydrin and location of block in glycolysis. Biochem J 1978; 170:23-37. [PMID: 629780 PMCID: PMC1183857 DOI: 10.1042/bj1700023] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
1. The effect of alpha-chlorohydrin on the metabolism of glycolytic and tricarboxylate-cycle substrates by ram spermatozoa was investigated. The utilization and oxidation of fructose and triose phosphate were much more sensitive to inhibition by alpha-chlorohydrin (0.1-1.0mm) than lactate or pyruvate. Inhibition of glycolysis by alpha-chlorohydrin is concluded to be between triose phosphate and pyruvate formation. Oxidation of glycerol was not as severely inhibited as that of the triose phosphate. This unexpected finding can be explained in terms of competition between glycerol and alpha-chlorohydrin. A second, much less sensitive site, of alpha-chlorohydrin inhibition appears to be associated with production of acetyl-CoA from exogenous and endogenous fatty acids. 2. Measurement of the glycolytic intermediates after incubation of spermatozoal suspensions with 15mm-fructose in the presence of 3mm-alpha-chlorohydrin showed a ;block' in the conversion of glyceraldehyde 3-phosphate into 3-phosphoglycerate. alpha-Chlorohydrin also caused conversion of most of the ATP in spermatozoa into AMP. After incubation with 3mm-alpha-chlorohydrin, glyceraldehyde 3-phosphate dehydrogenase and triose phosphate isomerase activities were decreased by approx. 90% and 80% respectively, and in some experiments aldolase was also inhibited. Other glycolytic enzymes were not affected by a low concentration (0.3mm) of alpha-chlorohydrin. Loss of motility of spermatozoa paralleled the decrease in glyceraldehyde 3-phosphate dehydrogenase activity. alpha-Chlorohydrin, however, did not inhibit glyceraldehyde 3-phosphate dehydrogenase or triose phosphate isomerase in sonicated enzyme preparations when added to the assay cuvette. 3. Measurement of intermediates and glycolytic enzymes in ejaculated spermatozoa before, during and after injection of rams with alpha-chlorohydrin (25mg/kg body wt.) confirmed a severe block in glycolysis in vivo at the site of triose phosphate conversion into 3-phosphoglycerate within 24h of the first injection. Glyceraldehyde 3-phosphate dehydrogenase activity was no longer detectable and both aldolase and triose phosphate isomerase were severely inhibited. Spermatozoal ATP decreased by 92% at this time, being quantitatively converted into AMP. At 1 month after injection of alpha-chlorohydrin glycolytic intermediate concentrations returned to normal in the spermatozoa but ATP was still only 38% of the pre-injection concentration. Motility of spermatozoa was, however, as good as during the pre-injection period. The activity of the inhibited enzymes also returned to normal during the recovery period and 26 days after injection were close to pre-injection values. 4. An unknown metabolic product of alpha-chlorohydrin is suggested to inhibit glyceraldehyde 3-phosphate dehydrogenase and triose phosphate isomerase of spermatozoa. This results in a lower ATP content, motility and fertility of the spermatozoa. Glycidol was shown not to be an active intermediate of alpha-chlorohydrin in vitro.
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Brunner G, Heidrich HG, Golecki JR, Bauer HC, Suter D, Plückhahn P, Ferber E. Fractionation of membrane vesicles. II. A method for separation of membrane vesicles bearing different enzymes by free-flow electrophoresis. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 471:195-212. [PMID: 21691 DOI: 10.1016/0005-2736(77)90250-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Free-flow electrophoresis was used to subfractionate membrane vesicles from calf thymocyte plasma membranes. The fractionation resulted in a separation of vesicle populations bearing four different enzymes: alkaline nitrophenyl-phosphatase (orthophosphoric-monoester phosphohydrolase (alkalin optimum) EC 3.1.3.1), gamma-glutamyltransferase (EC 2.3.2.2), (Mg2+ + Na+ + K+)-ATPase (ATP phosphohydrolase, EC 3.6.1.3) and acyl-CoA:lysophosphatidylcholine acyltransferase (acyl-CoA:1-acylglycero-3-phosphocholine-O-acyltransferase, EC 2.3.1.23). The specific content of cholesterol and total phospholipid coincided with the distribution of membrane-bound protein. However, vesicles migrating towards the cathode had a higher molar ratio of cholesterol to phospholipid (0.75) compared to those migrating to the anode (0.55). Sodium dodecyl sulphate-gel electrophoresis of pooled vesicle fractions also demonstrates distinct differences in their protein pattern. Electron-micrographic thin sections show that the vesicle populations have a similar morphology and size distribution. These results are discussed in terms of heterogeneity of the original thymocytes, contamination with intracellular membranes and a heterogeneous structure of the plasma membrane.
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150
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Suter D, Weidemann MJ. Regulation of carbohydrate metabolism in lymphoid tissue. Nature of the endogenous substrates and their contribution to the respiratory fuel of the sliced rat spleen in vitro. Biochem J 1976; 156:119-27. [PMID: 182138 PMCID: PMC1163723 DOI: 10.1042/bj1560119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. Tissue glycogen contributes, maximally, only 10% of the respiratory fuel of the rat spleen slice in the absence of an added carbon source, and makes no significant contribution when glucose (3mM) is added. 2. The reserves of fatty acid in the form of triglyceride (35.5mumol of fatty acid/g dry wt. of tissue) fall by approx. 25% after incubation of spleen slices with or without added glucose for 2h, and , on this basis, account for 32% of the oxidative fuel. 3. In contrast, the total oxidative contribution of fatty acid reserves to the respiratory fuel, determined on the basis of inhibiton of respiration by 2-bromostearate, is 42-52%. This range includes tissue from both starved and well-fed animals and is not significantly altered by the presence of added glycose (3mM). 4. Large quantities of NH3 (31-35mumol//h per g dry wt. of tissue) are produced by spleen slices incubated in the absence of added substrates, and this value is suppressed by approx. 50% on incubation with glucose (3mM). Adenine nucleotide breakdown can account for only 17% of the total ammonia produced. 5. Individual free amino acid concentrations in spleen were determined, both in vivo and in slices before and after 60 min of incubation. Although the total free amino acid pool size increases by 45% during incubation, owing to protein breakdown, the tissue concentrations of aspartate, glutamate, glutamine and alanine do not increase. It is suggested that these amino acids areoxidized in a net sense to CO2 and water with the liberation of free NH3 via transamination reactions, glutaminase, the purine nucleotide cycle and the tricarboxylic acid cycle. 6. It is concluded that the normal endogenous metabolism of sliced rat spleen (43-52% due to lipids, 30% due to amino acids and 10% due to glycogen) is modified by added glycose only to the extent that glycogen oxidation and 50% of the contribtion made by ino acids are suppressed; endogenous lipid metabolism is unaffected.
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