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19 results on '"M.L. Rivas"'

1. Mineralogical and magnetic characterization of Olmec ilmenite multi-perforated artifacts and inferences on source provenance

Author

Ann Cyphers, Amar Agarwal, Jaime Urrutia-Fucugauchi, M.L. Rivas-Sánchez, Luis M. Alva-Valdivia, and Judith Zurita-Noguera

Subjects
Provenance, 010504 meteorology & atmospheric sciences, Mesoamerica, Geochemistry, Mineralogy, engineering.material, 010502 geochemistry & geophysics, Granulite, 01 natural sciences, Rock magnetism, Petrography, Precambrian, Geochemistry and Petrology, engineering, Olmec, Geology, Ilmenite, 0105 earth and related environmental sciences
Abstract

The Olmec culture arose and flourished on Mexico’s southern Gulf Coast between 1800 and 400 BC, and developed extensive trade relationships for procurement of exotic materials from distant regions. The early capital of Mesoamerica’s first civilization, the archaeological site of San Lorenzo, flourished between 1400 and 1000 BC, in the humid tropical coastal plains of southern Veracruz. Previous studies have revealed the regional importation of iron-ore, minerals and stone, such as obsidian, greenstone, and mica, for sculptures, grinding tools and artifacts used in domestic, ceremonial and productive activities. This study focuses on the sourcing of non-local artifacts, made from iron–titanium (ilmenite) oxide mineral and iron-ores, found in large quantities in the archeological excavations, in order to shed light on Early Preclassic trade. We study multi-perforated ilmenite artifacts and iron–titanium oxide ores from potential provenance areas using rock magnetic analyses, macroscopic observations, petrography, scanning electron microscopy and micro-geochemistry. Magnetic analyses include magnetic susceptibility as a function of high temperature, hysteresis, isothermal remanent magnetization (IRM) acquisition and backfield demagnetization of saturation IRM, and first-order reverse curves. Based on the Curie points and coercivity ranges, we suggest that the geographically unidentified source III-a, proposed earlier, corresponds to the Huitzo anorthosites. The mineralogical and textural relations between ilmenite and granulite host-rocks also suggest for the ilmenite in Olmec samples an origin that is similar to the Huitzo anorthosites. The compositional similarity between large apatite grains in the Huitzo and Olmec samples, and the high MgO content (1.3(6) wt%) of Olmec ilmenite are additional evidence that the provenance of the Olmec ilmenite artifacts is in the Huitzo area, within the northern part of the Oaxaquia Precambrian complex.

Published
2017
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2. Characterization and surface reactivity of natural and synthetic magnetites

Author

Mario Villalobos, Jesús Arenas-Alatorre, M.L. Rivas-Sánchez, Jorge Alcaraz-Cienfuegos, Carlos Salazar-Camacho, and Margarita Gutiérrez-Ruiz

Subjects
Analytical chemistry, Mineralogy, Geology, chemistry.chemical_compound, Particle aggregation, Adsorption, chemistry, Dynamic light scattering, Geochemistry and Petrology, Particle, Particle size, High-resolution transmission electron microscopy, Wet chemistry, Magnetite
Abstract

Magnetite is an Fe (II/III) oxide mineral that occurs naturally and potentially as small particles with significant surface reactivity, and although much work is reported on synthetic material, little work exists for natural samples. The goal of the present work was to carefully characterize four natural magnetite samples from an iron ore deposit and two synthetic commercial reference samples, and to compare their surface characteristics and reactivity with the aim of evaluating their geochemical behavior towards adsorption of environmentally relevant ions, as well as their potential for use as environmental remediation sorbents. The techniques used were wet chemistry, X-ray diffraction, Raman spectroscopy, magnetic measurements (hysteresis curves), dynamic light scattering, scanning electron microscopy, low and high resolution transmission electron microscopy, BET Nitrogen adsorption, and electrophoresis. In addition, their As(V) adsorption behavior was measured at pH 6, and was analyzed as related to the surface characteristics and particle aggregation behavior determined. The analyses revealed high magnetite purity in the natural samples, and specific surface areas (SSA) ranging from 1 to 8 m2/g. Small alumino-silicate impurities were found in natural magnetites, apparently occurring at the particle surfaces and thus significantly lowering their isoelectric points as compared to the pure synthetic materials. All samples are composed of aggregates of 39–52 nm magnetite particle units, but highly aggregated with very large size dispersions. The synthetic sample with the smallest particle size (30 nm in average — 39 m2/g) showed its entire surface area available for adsorption, despite its highly aggregated state observed, suggesting an open and highly dynamic aggregate framework. The other larger samples showed more complex aggregation behavior, which produced: (1) a widely variable As(V) adsorption behavior with no clear predictable pattern among samples; and (2) a large decrease of the As(V) adsorption maxima with increasing solids concentration imposed in the experimental set-up for any one particular sample. Therefore, we recommend high caution in using the BET-SSA and solids concentration parameters when performing experimental adsorption work with microsized magnetite, especially when extrapolating laboratory results to field geochemical or engineered conditions for evaluating contaminant adsorption.

Published
2013
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3. Berthierine and chamosite hydrothermal: genetic guides in the Peña Colorada magnetite-bearing ore deposit, Mexico

Author

M. Ruiz-Sandoval, M. A. Ramos-Molina, Jaime Urrutia-Fucugauchi, M.L. Rivas-Sánchez, Jesús Arenas-Alatorre, and Luis M. Alva-Valdivia

Subjects
Chamosite, Mineralogy, Geology, Electron microprobe, Sericite, Feldspar, Silicate, Hydrothermal circulation, chemistry.chemical_compound, Siderite, chemistry, Space and Planetary Science, visual_art, visual_art.visual_art_medium, Magnetite
Abstract

We report the first finding of berthierine and chamosite in Mexico. They occur in the iron-ore deposit of Peña Colorada, Colima. Their genetic characteristics show two different mineralization events associated mainly to the magnetite ore. Berthierine is an Fe-rich and Mg-low 1:1 layer phyllosilicate of hydrothermal sedimentary origin. Its structure is 7 Å, d hkl [10 0] basal spacing and low degree structural ordering. The phyllosilicate has been identified by a lack of 14 Å basal reflection on X-ray diffraction (XRD) patterns. These data were supported by High Resolution Transmision Electron Microscopy (HRTEM) images that show thick packets of berthierine in well defined parallel plates. From the analysis of Fast Fourier Transform (FFT), we found around [1 0 0] reflections of berhierine 7.12 Å and corresponding angles of hexagonal crystalline structure. Berthierine has a microcrystalline structure, dark green color, and high refraction index (1.64 to 1.65). Birefringence is low, near 0.007 to null and it is associated to nanoparticles (d hkl [0 0 1]. The chamosite occurs as lamellar in sizes ranging from 50 to 150 μm. It has intense green color and refraction index from 1.64 to 1.65. The birefringence is near 0.008, with biaxial (-) orientation and a 2V small. It is associated mainly to sericite, epidote, clay, feldspar, and magnetite. Chamosite is emplaced in open spaces filling and linings. Mössbauer spectra of berthierine and chamosite are similar. They show the typical spectra of paramagnetic substances, with two well defined unfoldings corresponding to the oxidation state of Fe+2 and Fe+3. Chemical composition of both minerals was obtained by an electron probe X-ray micro-analyzer (EPMA). The radio Fe+Mg+Mn vs Si and Al show similar chemical compositions and different XRD patterns in the crystalline structure provoked by the environmental conditions of emplacement. A hydrothermal environment was predominant, occurring before, during, and after the magnetite mineralization. The identification of magnetite nanoparticles supports the hypothesis of a marine environment, specifically exhalative sedimentary (SEDEX) for the berthierine.

Published
2006
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4. Paleomagnetic and magnetic fabric studies of the San Gaspar ignimbrite, western Mexico—constraints on emplacement mode and source vents

Author

M.L. Rivas-Sánchez, José Rosas-Elguera, Avto Goguitchaichvili, Jaime Urrutia-Fucugauchi, T. Bravo-Medina, Héctor López-Loera, Bernard Henry, Cecilia Caballero, and Luis M. Alva-Valdivia

Subjects
Paleomagnetism, geography, geography.geographical_feature_category, Demagnetizing field, Mineralogy, Magnetic hysteresis, Rock magnetism, Volcanic rock, Igneous rock, Geophysics, Geochemistry and Petrology, Remanence, Caldera, Petrology, Geology
Abstract

Paleomagnetic and magnetic fabric data for the 4.8 Ma San Gaspar ignimbrite, one of the largest in western Mexico, are used to investigate the source vents, emplacement mechanism and tectonics. Rock magnetic properties from distant parts of the ignimbrite are similar, suggesting relatively homogeneous mineralogy of the unit. Isothermal remanence and continuous susceptibility-temperature experiments point to low to medium-Ti titanomagnetites as the main magnetic carriers. Hysteresis ratio parameters of most samples fall in the pseudo-single-domain grain size region; wasp-waisted hysteresis loops were identified corresponding to high Hcr / Hc values. Stepwise thermal and alternating field demagnetization shows that secondary components are completely removed below 20 mT or 400 °C. Thereafter, the characteristic component is isolated with small within-site dispersion of mean direction (α95

Published
2005
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5. Microscopy and rock magnetism of fine grain-size titanomagnetite from the Jacupiranga Alkaline Complex, Brazil: unearthing Ti-magnesioferrite nanoparticles

Author

M.L. Rivas-Sánchez, Omar Ferreira Lopes, Avto Goguitchaishvili, Luis M. Alva-Valdivia, and Jesús Arenas-Alatorre

Subjects
TMf nanoparticles, Materials science, Fine grain, Brasil, nanopartículas de titanomagnesio-ferrita, propiedades magnéticas, Analytical chemistry, Grain size effect, mineralogía, engineering.material, complejo alcalino Jacupiranga, Jacupiranga Alkaline Complex, Titanomagnetite, Magnesioferrite, General Energy, Geophysics, grain size effect, engineering, Ciencias de la Tierra, magnetic properties, mineralogy, efecto del tamaño de grano, Brazil
Abstract

Very fine samples from the mineralized zones of the Jacupiranga complex at the Cajati mine were selected for crystallographic identification of Ti-magnesioferrite (TMf) nanostructures embedded in titanomagnetite (TM) using high-resolution transmission electron microscopy (TEM). A magnetic concentrate obtained of pyroxenite samples (sites 4 to 7) was reduced and divided into fractions of distinct range sizes: 26±2 μm, 19±1 μm, 13±1 μm, 9±1 μm, 6±1 μm and 6-0.1 μm. The mineralized samples of carbonatite and pyroxenite were characterized by X-ray diffraction, transmitted and reflected light microscope, and scanning electron microscope with multielemental analysis. The finest magnetic concentrate sample (MC6) was analyzed under high-resolution transmitted electron microscopy (TEM) and high angle annular dark field and Raman spectroscopy. Magnetic properties were measured for the distinct granulometric fractions, showing drastic changes when grain sizes go beyond the frontier from micro to nanometer sizes. Frequency-dependent magnetic susceptibility percentage (÷fd%) report higher values (10.2%) for the finer fractions (6±1 μm and 6-0.1 μm) attributed to dominant fractions of superparamagnetic particles. Nanometer and < 6 μm grain size TMf in TM particles require a magnetic field up to 249 mT to reach saturation during the isothermal remanent magnetization experiment. Coercivity and remanent magnetization of these samples increase when the particle size decreases, probably due to parallel coupling effects. Magnetic susceptibility versus temperature experiments were conducted two times on the same (< 35 nm) sample, showing that the repetition during the second heating is probably due to the formation of new TMf nanoparticles and growth of those already present during the first heating process.

Published
2013

6. Contents, Vol. 22, 1978

Author

N.E. Morton, P. Pierce, K. Simola, C.E. Wright, E.J. Yunis, M.E. Chandler, H. Vriesendorp, B.J.B. Keats, C.J. Sherr, K. Bender, R.E. Magenis, H. Oie, B.B. Knowles, J.M. Luciani, M.P. Cowmeadow, I.L. Hansteen, M. Bobrow, G.A. Koch, M. Prensky, P.A. Lalley, N. Shimizu, E.A. Nichols, J. Garver, K. Hirschhorn, A. Brøgger, A.F. Gazdar, S. Hempfling, L.C. Yu, B. Pernis, R. Mausner, S. Leupe-de Smit, R.C.P. Go, A. Westerveld, L. R. Weitkamp, K.E. Toomey, D. Borgaonkar, S. Piomelli, D. Bootsma, T. Campana, E.W. Lovrien, O.J. Miller, H.J. Cooke, F.T. Kao, D.A. Aitken, S. Burgess, L.L. Haley, Y. Boyd, A. Mayerová, T.B. Shows, H.J. Evans, J. Fraisse, K.-H. Grzeschik, V.M. Regina, K.C. Atwood, L.M.M. Wijnen, Liao Law, H.-H. Ropers, M.A. Ferguson-Smith, M.A. Pellegrino, T. Gedde-Dahl, V.A. McKusick, A.C. Leary, J. H. Olving, M.G. Byers, D. Swallow, K.M. Overton, W.F. Witterland, J. Hemmerling, S.J. Funderburk, A. de la Chapelle, N.R. Mendell, U. Francke, Veronica van Heyningen, A.F. Naylor, I.W. Craig, A. Heiberg, R.S. Lemons, J.E. Gray, E. Herbschleb-Voogt, J.J. Yunis, D.B. Amos, C.K. Eun, J.L. Hamerton, L. U. Lamm, N. Oliver, S. Goodnight, F. Pellett, T.M. Dijksman, J.M. Vance, R.E. Eisenman, P. Rubinstein, A. Bratlie, G.A.P. Bruns, V. Kirton, R. Roos, D.L. Slate, M.C. Yoshida, D.L. George, R.C. Schwartz, K.E. Buckton, A.S. Henderson, R. Jonassen, J.A. Robinson, P.L. Pearson, M. Hultén, E. Solomon, A.E. Greene, L.Y. Wang, R. Lange, S. Brown, M.L. Schroeder, P. Karli, A. Krüger, J.M. Robert, B. Lauras, J. Chamberlin, A. Shalev, J. Ott, B.J. Mintz, Elizabeth B. Robson, Per Teisberg, N. Tanigaki, P. M. Conneally, S. Rosenfeld, A.S. Baim, M.L. Rivas, J.A. Brown, R. Johannsmann, N. Suciu-Foca, R. Mierau, T.T. Puck, C.G. Palmer, S.J. Jeremiah, D. Warburton, M. Devictor-Vuillet, J.A. Norton, T. Ho, J.E. Noades, F. Varricchio, E.H.Y. Chu, B. Carritt, R. Schwab, I. Balazs, J. Reiss, C.N. Fear, S. Povey, Erik Thorsby, A. Siverts, D.W. Ball, W. Stanley, L.R. Weitkamp, M.E. Duncan, C. Jones, K. Willecke, S. Philipps, R. Moreland, D.C. Rao, E. Tolley, T. Philip, E. Johnston, M. Monteba-van Heuvel, A.D. Merritt, T.H. Roderick, R.L. Eddy, S. Arias, R.A. Fisher, M.A. Craft, J.H. Edwards, M.C. Sparkes, N.C. Sun, L. Korsnes, D.A. Meyers, M.Y. Tsai, A.W. Johnston, A. Estop, B.M. Turner, K. Berg, S. Guttormsen, W.G. Burgerhout, A.P. Goggin, T. Mohandas, W.K. Stanford, C.W. Bazinet, M. Siniscalco, R.H. Lindenbaum, H.P. Klinger, W.S. Volkers, J. Gavin, K.K. Namboodiri, M.T. Davisson, P.J. McAlpine, W.R.T. Los, M. Meisler, L.J. Donald, F.H. Ruddle, W. Bauch, Timothy A. Donlon, C.R.Y. Sun, R. Bigley, R.S. Sparkes, H. Kaita, P.S. Gerald, E.R. Giblett, I. Berczi, R.C. Elston, S.J. O’Brien, C.T. Falk, L. Scrafford-Wolff, M. Smith, M.K. Fagerhol, J. de Witt, S. Rowe, D. Cox, E.S. Seravalli, T. Borun, M. Lewis, R. Saisson, M.A. Pericak-Vance, R.T. Taggart, R.D.G. McKay, M. Mota, W. R. Mayr, Matthew Parks, F. Freycon, Y. Shimizu, B. Hellkuhl, D.P. Aden, C.A. Slaughter, J.E. Anderson, E. Lovrien, R.M. Denney, N. Lamvik, J. Parekh, B.P. Dorman, A.P.M. Jongsma, M.A. Nijman, C. Verma, J. Wood, M.J. Champion, R. Sanger, A. Bennick, P.L. Yu, A.F. Wilson, W.L. Marsh, L. Pajunen, H. Hameister, B.A. Doppert, J.J. Garver, J.R. Sawyer, P. Meera Khan, P.J.L. Cook, Bjørnar Olaisen, R.C. Karn, J.D. Minna, J.D. Shulkin, B.M. Page, P.M. Sinet, B. Sykes, E.M. Helveston, C.W.H. Partridge, M. Blumenthal, P. Szabo, and E.A. Azen

Subjects
Botany, Genetics, Biology, Molecular Biology, Genetics (clinical)
Published
1978
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9. Subject Index Vol. 16, 1976

Author

D.E. Wilson, P. Shaffer-Berman, E. Solomon, N. Shimizu, S. Goss, P. DeBona, A.G. Steinberg, R.M. Siervogel, A.S. Henderson, T.-S. Chan, J.E. Anderson, A.B. Deisseroth, J.A. Anderson, D. Weil, A.D. Merritt, M. Velivasakis, D. Cox, P. Meera Khan, K.M. Overton, G.B. Côté, E. Lovrien, J.A. Brown, S. Chen, C. Finaz, R.H. Schwartz, I.W. Craig, J. Courval, B. Olaisen, P. Teisberg, J.A. Robinson, P.L. Pearson, M.C. DuVal, N. Busby, M. Ray, T.P. Webb, R.H. Kennett, C.J. Chern, P.J. Davies, I. Schreuder, B. Kaiser McCaw, H. Wyandt, J. Mohr, A. Icén, K.E. Buckton, A.R. Dunn, A.W. Nienhuis, J.V. Higgins, R.G. Worton, P.J.L. Cook, G. Spowart, J.A. Norton, J.E. Noades, R.S. Kucherlapati, W.S. Volkers, T.B. Shows, H. Wang, R.A. Raeburn, Matthew Parks, R.E. Magenis, M. Bobrow, S. Hansen, H.M. Dick, S.H. Boyer, S.H. Hsu, Veronica van Heyningen, K.R.M. Pai, R.A. Fisher, D.P. Aden, C.A. Slaughter, A.B. Bijnen, R.D. Koler, S. Guttormsen, R. Sanger, D. Linder, F. Hecht, D. Bacon, R.B. Surana, P.L. Yu, L.A. Klobutcher, O. Smithies, T.T. Puck, D.A. Hopkinson, D. Warburton, D. Shaw, K. Berg, S.J. Goss, L.L.L. Wijnen, D.A. Meyers, A. Heiberg, T. Gedde-Dahl, E. Hackel, C. Cochet, J. Frézal, C.M. Giles, A.A. Biegel, I.P. Gormley, M. Smith, F.-T. Kao, P. Vuopio, B. Schacter, B. Clark, J.D. Minna, T.A. Tedesco, M.G. Brown, C.J. Glueck, K.G. Orkwiszewski, H. Skre, K. Hirschhorn, N. Van Cong, W.F. Bodmer, W.G. Burgerhout, B.A. Doppert, W. Bodmer, G. Skude, A. Boué, E.A. Jones, K.C. Atwood, S. McDonald, C.M. Croce, E. Eicher, E.S. Seravalli, R.C.P. Go, C.G. Palmer, E.B. Robson, K. Bender, D.A. Aitken, R.P. Creagan, W.F. Anderson, P.H. Gallimore, J.B. Dossetor, W. Putt, M. Lewis, V. Lewis, F.H. Ruddle, J. Ott, H. Eiberg, M. Rivas, T.H. Marshall, M.E. Hodes, K.D. Smith, P. Bowen, A.P.M. Jongsma, R. Bigley, N. Lea, G.F. Brooks, H. Kaita, L. Wisniewski, E.R. Giblett, H.E. Faber, R.C. Elston, P. Couillin, W.B. Bias, H. Koprowski, R. Rebourcet, C.T. Falk, M.T. Yu, L.J. Stevens, U. Francke, J.J. van Rood, G. Pontecorvo, P.E. Polani, D. Patterson, E.W. Lovrien, E.A. Nichols, J.L. Hamerton, D.P. Singal, J.K. McDougall, M.L. Rivas, T. Reber, B.H. Petersen, S. Povey, Erik Thorsby, G. Khoury, E. Tolley, W.R. Breg, T. Hassold, L. Kunkel, R.L. Eddy, L.L. Haley, J. Shuster, M.A. Ferguson-Smith, D.W. Buck, R.M. Denney, K. Lange, F.H. Allen, B.R. Migeon, P. Goodfellow, R. Kucherlapati, L.R. Weitkamp, J. de Grouchy, B.M. Turner, S.S. Wachtel, T. Mohandas, P.M. Conneally, M. Siniscalco, M.D. Poulik, R. Velez, A. Hershberg, B. Moore, G.C. Koo, V.M. Chapman, A. Westerveld, B. Hellkuhl, H.P. Klinger, D. Bootsma, K.K. Namboodiri, G. Wullems, O.J. Miller, P. Gold, P. Perry, P.J. McAlpine, P.A. Lalley, A. Brøgger, J. Schlaut, M.W. Thompson, A. de la Chapelle, B. Chown, A.G. Searle, I. Pagan-Charry, C. Jones, J. van der Horst, H. van Someren, K. Willecke, E. Johnston, J.H. Edwards, W.J. Mellman, K.-H. Grzeschik, S. Ohno, P. Teesdale, C.S.N. Lee, L. Wang, and V.S. Turner

Subjects
Index (economics), Statistics, Genetics, Subject (documents), Biology, Molecular Biology, Genetics (clinical)
Published
1976
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10. Contents, Vol. 14, 1975

Author

T. Gedde-Dahl, P.M Conneally, G.R. Douglas, J. Prosser, E. Grace, J.L. Hamerton, K.-H. Grzeschik, M.A. Ferguson-Smith, P.L. Pearson, G. Corneo, E.A. Nichols, G.J. Wullems, M. Bobrow, N.C. Sun, J.E. Syrett, J.K. McDougall, R. Rebourcet, J. Frézal, V.A. McKusick, F.H. Ruddle, W. Keijzer, A. Westerveld, T.G. Gedde-Dahl, R.M. Baker, R.C. Miller, F. Hecht, P. Goodfellow, B. Olaisen, J. Ott, A.J.J. Reuser, A. Vust, C.W.H. Partridge, D.R. Bolling, J. Fleming, S.E. Gardiner, P.J. McAlpine, D.M. Steffensen, E.R. Giblett, D. Kacian, E.M. Wurzer-Figurelli, R.S. Kucherlapati, T.B. Shows, K. Berg, H. Bosker, K.C. Atwood, M.C. Rattazzi, D.W. Buck, K.W. Jones, A.G.J.M. van der Linden, R.P. Clayton, J. German, W. Prensky, V. Niewczas-Late, D. Bergsma, C.M. Giles, D.A. Meyers, E.M. Eicher, D.S. Borgaonkar, D. Mutton, K.P. Glen, P.M. Ellis, K. Hirschhorn, E. Jones, S. Povey, A. Hoogeveen, J. van der Horst, J.J. van Rood, P.M. Price, B. Bengtsson, W.G. Burgerhout, C.C. Chang, L.R. Weitkamp, R.E. Giles, E. Magenis, H. van Someren, H.M.A. Beyersbergen van Henegouwen, R.A. Buckland, K. Willecke, U. Francke, D. Bootsma, C. Partridge, R. Kennett, E. Johnston, D.A. Hopkinson, A.E. Greene, O. Mutchinick, R.P. Creagan, R.S.K. Chaganti, L. Komarnicki, T. Mohandas, M. Fellous, K. Fenger, J.H. Edwards, G. Beckman, A.S. Henderson, M.L. Rivas, L. Beckman, W.R.T. Los, L.L. Coriell, I. Purdom, N. van Cong, P. Meera Khan, H.A. de Wit-Verbeek, G.B. Côté, A.R. Mitchell, Veronica van Heyningen, S.A. Sørensen, L. Wang, E. Solomon, J.A. Brown, W.S. Volkers, H. Galjaard, J.E. Anderson, C. Pangalos, A.P.M. Jongsma, R. Sanger, S.M. Elsevier, E. Lovrien, A.B. Bijnen, M.K. Fagerhol, J.A. Pierce, M. Lewis, E.H.Y. Chu, W.B. Bias, D. Weil, S. Chen, J. de Wit, C.G. Palmer, P.W. Teesdale, F.A. McMorris, G. Miller, A.D. Merritt, R.G. Davidson, J.R. Gosden, I. Schreuder, W.F. Bodmer, P.J.L. Cook, J.E. Gray, N. Busby, H. Kaita, R.C. Elston, Y.-S. Teng, S.M. Bowser Riley, R.A. Oosterbaan, P.L. Townes, E.B. Robson, H.J. Evans, L.E. Nijenhuis, and A. Hagemeijer

Subjects
Botany, Genetics, Biology, Molecular Biology, Genetics (clinical)
Published
1975
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12. Subject Index Vol. 22, 1978

Author

S.J. Funderburk, J.E. Gray, G.A. Koch, L. Korsnes, A.S. Henderson, W.R.T. Los, D.A. Meyers, J.D. Minna, Per Teisberg, J.D. Shulkin, B.M. Page, M.C. Yoshida, K.E. Buckton, M.C. Sparkes, A.P. Goggin, M.L. Rivas, P.S. Gerald, K. Simola, C.E. Wright, W.K. Stanford, J.A. Brown, R.C.P. Go, L. Scrafford-Wolff, P.M. Sinet, D.C. Rao, E.J. Yunis, A. Westerveld, L. R. Weitkamp, B. Sykes, M. Bobrow, N. Oliver, H.-H. Ropers, M.A. Ferguson-Smith, D. Borgaonkar, S. Piomelli, D. Bootsma, C.W. Bazinet, A.F. Wilson, H. Hameister, P.J.L. Cook, E. Herbschleb-Voogt, J.J. Yunis, P. Szabo, S. Philipps, W. R. Mayr, T.B. Shows, E.A. Azen, R.C. Schwartz, J.M. Vance, S. Leupe-de Smit, D. Swallow, A.C. Leary, Bjørnar Olaisen, R.C. Karn, Y. Shimizu, B.J.B. Keats, E. Solomon, M.L. Schroeder, T. Gedde-Dahl, O.J. Miller, V. Kirton, J. H. Olving, S. Brown, R. Roos, D. Cox, F. Pellett, L.Y. Wang, Timothy A. Donlon, R.E. Magenis, E.M. Helveston, N.C. Sun, A. de la Chapelle, J.M. Luciani, A. Heiberg, R.S. Lemons, D.L. George, C.R.Y. Sun, R.D.G. McKay, R.M. Denney, N. Lamvik, A.S. Baim, R. Schwab, I. Balazs, N.E. Morton, L. Pajunen, M. Blumenthal, J.R. Sawyer, Elizabeth B. Robson, R.E. Eisenman, M. Prensky, P.A. Lalley, K.M. Overton, T.M. Dijksman, L.C. Yu, J.A. Robinson, L.M.M. Wijnen, H. Kaita, R.C. Elston, S.J. O’Brien, J. Garver, M.A. Nijman, M. Monteba-van Heuvel, P.L. Pearson, S. Povey, Erik Thorsby, B. Lauras, P. M. Conneally, V.A. McKusick, E. Tolley, K. Willecke, A.D. Merritt, R. Moreland, P. Meera Khan, P. Pierce, T.H. Roderick, M.Y. Tsai, R. Johannsmann, T. Campana, A. Brøgger, E.W. Lovrien, R.L. Eddy, N. Suciu-Foca, C.G. Palmer, C. Jones, A.F. Gazdar, A. Shalev, M.K. Fagerhol, E. Johnston, J. Reiss, C.N. Fear, S. Burgess, L.L. Haley, S. Hempfling, W.S. Volkers, J. Gavin, Liao Law, Y. Boyd, A. Mayerová, J.H. Edwards, M.G. Byers, W. Stanley, L.R. Weitkamp, M.E. Duncan, H.J. Evans, L.J. Donald, B. Hellkuhl, F.H. Ruddle, I.L. Hansteen, B.M. Turner, I.W. Craig, K.-H. Grzeschik, T. Mohandas, A. Siverts, D.W. Ball, K.C. Atwood, R. Bigley, L. U. Lamm, R.S. Sparkes, M. Siniscalco, S. Arias, R.A. Fisher, M. Mota, E.R. Giblett, C.T. Falk, S. Guttormsen, N.R. Mendell, K. Hirschhorn, M. Smith, H. Oie, M.P. Cowmeadow, F.T. Kao, J. de Witt, N. Shimizu, E.A. Nichols, E.S. Seravalli, D.A. Aitken, R. Mausner, M. Hultén, M. Lewis, R. Saisson, A. Bratlie, A.E. Greene, P. Karli, J. Chamberlin, M.T. Davisson, P.J. McAlpine, C.W.H. Partridge, I. Berczi, W.F. Witterland, Veronica van Heyningen, B.P. Dorman, A.P.M. Jongsma, P. Rubinstein, B.B. Knowles, C. Verma, J. Wood, M.J. Champion, B. Pernis, R. Sanger, K.E. Toomey, A. Bennick, P.L. Yu, W.L. Marsh, V.M. Regina, B.A. Doppert, J.J. Garver, U. Francke, J. Fraisse, M.E. Chandler, G.A.P. Bruns, H. Vriesendorp, S. Rowe, A. Krüger, J.M. Robert, B.J. Mintz, K. Bender, R. Lange, T. Borun, J.A. Norton, T. Ho, J.E. Noades, M.A. Pericak-Vance, R.T. Taggart, N. Tanigaki, M.A. Craft, K. Berg, Matthew Parks, F. Freycon, D.P. Aden, C.A. Slaughter, H.J. Cooke, J.E. Anderson, E. Lovrien, A.W. Johnston, A. Estop, J. Parekh, W.G. Burgerhout, M.A. Pellegrino, J. Hemmerling, A.F. Naylor, J.L. Hamerton, S. Goodnight, D.B. Amos, C.K. Eun, D.L. Slate, R. Jonassen, J. Ott, R. Mierau, T.T. Puck, D. Warburton, M. Devictor-Vuillet, C.J. Sherr, R.H. Lindenbaum, H.P. Klinger, K.K. Namboodiri, M. Meisler, S. Rosenfeld, F. Varricchio, E.H.Y. Chu, B. Carritt, T. Philip, W. Bauch, and S.J. Jeremiah

Subjects
Index (economics), Statistics, Genetics, Subject (documents), Biology, Molecular Biology, Genetics (clinical)
Published
1978
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13. References to the committee reports

Author

L.R. Weitkamp, J.E. Anderson, F.A. McMorris, L. Komarnicki, O. Mutchinick, S.M. Elsevier, T. Mohandas, J.L. Hamerton, G. Miller, J.R. Gosden, E. Lovrien, D.R. Bolling, J. Fleming, H.J. Evans, G.J. Wullems, J. Prosser, N.C. Sun, H. Bosker, K.C. Atwood, W. Keijzer, H.M.A. Beyersbergen van Henegouwen, A.B. Bijnen, M.K. Fagerhol, J. Ott, J. van der Horst, E. Grace, C.W.H. Partridge, R.C. Miller, Y.-S. Teng, P.J. McAlpine, J.E. Gray, J. de Wit, H. van Someren, K. Willecke, K. Hirschhorn, V. Niewczas-Late, T.B. Shows, D.A. Hopkinson, A.E. Greene, L. Beckman, J.A. Pierce, H.A. de Wit-Verbeek, P.W. Teesdale, R. Kennett, E. Johnston, R.E. Giles, G.B. Côté, P.L. Pearson, E. Magenis, A.G.J.M. van der Linden, M. Bobrow, V.A. McKusick, N. van Cong, J.H. Edwards, A.D. Merritt, P. Meera Khan, R.G. Davidson, P.L. Townes, I. Schreuder, S.A. Sørensen, K.W. Jones, J. Frézal, M.L. Rivas, E.B. Robson, D. Weil, A. Hoogeveen, R.A. Buckland, J.J. van Rood, K.-H. Grzeschik, E. Jones, E.A. Nichols, W.F. Bodmer, P.J.L. Cook, D.S. Borgaonkar, L. Wang, E. Solomon, B. Olaisen, K. Fenger, A.S. Henderson, A.J.J. Reuser, A. Vust, G. Beckman, E.M. Wurzer-Figurelli, J.E. Syrett, W.G. Burgerhout, C.C. Chang, D. Kacian, Veronica van Heyningen, S.E. Gardiner, A.R. Mitchell, W.B. Bias, C.M. Giles, S. Chen, F. Hecht, J.A. Brown, N. Busby, H. Kaita, C.G. Palmer, D.A. Meyers, R.C. Elston, T.G. Gedde-Dahl, R.M. Baker, A.P.M. Jongsma, K. Berg, R.S. Kucherlapati, L.E. Nijenhuis, I. Purdom, R. Sanger, R.P. Clayton, U. Francke, J.K. McDougall, J. German, P.M. Ellis, S.M. Bowser Riley, P.M. Price, M. Lewis, S. Povey, E.H.Y. Chu, R.A. Oosterbaan, L.L. Coriell, P. Goodfellow, D. Mutton, K.P. Glen, C. Partridge, R.S.K. Chaganti, D. Bootsma, M. Fellous, W. Prensky, W.R.T. Los, D.M. Steffensen, G. Corneo, D.W. Buck, E.M. Eicher, A. Westerveld, B. Bengtsson, M.C. Rattazzi, F.H. Ruddle, E.R. Giblett, W.S. Volkers, R.P. Creagan, T. Gedde-Dahl, P.M Conneally, G.R. Douglas, M.A. Ferguson-Smith, H. Galjaard, C. Pangalos, R. Rebourcet, D. Bergsma, and A. Hagemeijer

Subjects
Genetics, Library science, Biology, Bioinformatics, Molecular Biology, Genetics (clinical)
Published
1975
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14. Linkage group I: multipoint mapping

Author

Frederick Hecht, M.L. Rivas, L. Wang, C.G. Palmer, P. M. Conneally, A.D. Merritt, E.W. Lovrien, E. Magenis, and D.A. Meyers

Subjects
Male, Linkage (software), Genetics, Rh-Hr Blood-Group System, Computers, Genetic Linkage, Chromosomes, Human, 1-3, Chromosome Mapping, Biology, Consanguinity, Genetics, Population, Sex Factors, Phosphoglucomutase, Group (periodic table), Sex factors, Humans, Female, Molecular Biology, Genetics (clinical)
Published
1975
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15. Natural magnetite nanoparticles from an iron-ore deposit: size dependence on magnetic properties

Author

Jaime Urrutia-Fucugauchi, M.L. Rivas-Sánchez, Mireille Perrin, Avto Goguitchaichvili, Jesús Arenas-Alatorre, Luis M. Alva-Valdivia, M. A. Ramos Molina, M. Ruiz-Sandoval, Laboratorio de Paleomagnetismo [Mexico], Universidad Nacional Autónoma de México (UNAM), Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México ( UNAM ), Instituto de Física, Universidad Nacional Autónoma de México, Université du Québec, Université des Antilles et de la Guyane ( UAG ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofisica, Sede Michoacan, Universidad Nacional Autonoma de Mexico, and Dirección General y Dirección de Tecnología, Consorcio Minero Benito Juárez

Subjects
010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [SDE.MCG]Environmental Sciences/Global Changes, Analytical chemistry, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], 010502 geochemistry & geophysics, 01 natural sciences, chemistry.chemical_compound, [ SDU.STU.GP ] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Nuclear magnetic resonance, [ PHYS.PHYS.PHYS-GEO-PH ] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], berthierine, Mössbauer spectroscopy, Saturation (magnetic), Mexico, Magnetite nanoparticles, 0105 earth and related environmental sciences, Magnetite, [ SDU.STU.PE ] Sciences of the Universe [physics]/Earth Sciences/Petrography, iron-ore deposit, Geology, particle size, Magnetic susceptibility, Grain size, [ SDE.MCG ] Environmental Sciences/Global Changes, chemistry, Remanence, Space and Planetary Science, Peña Colorada, Particle size, magnetic properties, Superparamagnetism
Abstract

We report on the discovery of magnetite nanoparticles ranging in size from 2 to 14 nm in the mineralized zones of the Pe~na Colorada iron-ore deposit, southern Mexico. Micrometric scale magnetite was magnetically reduced and divided into distinct size ranges: 85-56 μm, 56-30 μm, 30-22 μm, 22-15 μm, 15-10 μm, 10-7 μm and 7-2 μm. Nanometric-scale magnetite in the size range 2-14 nm was identified. The magnetite was characterized by X-ray diffraction, transmitted and reflected light microscope, high-resolution transmission electron microscopy (TEM), high angle annular dark field, Mossbauer spectroscopy and its magnetic properties. Crystallographic identification of nanostructures was performed using high-resolution TEM. Characteristic changes were observed when the particles make the size transition from micro- to nanometric sizes, as follows: (1) frequency-dependent magnetic susceptibility percentage (χFD%) measurements show high values (13%) for the 2-14 nm fractions attributed to dominant fractions of superparamagnetic particles; (2) variations of χFD% < 4.5% in fractions of 56-0.2 μm occur in association with the presence of microparticles formed by magnetite aggregates of nanoparticles (< 15 nm) embedded in berthierine; (3) Mössbauer spectroscopy results identified a superparamagnetic fraction; (4) nanometric and 0.2-7 μm grain size magnetite particles require a magnetic field up to 152 mT to reach saturation during the isothermal remanent magnetization experiment; (5) coercivity and remanent magnetization of the magnetite increase when the particle size decreases, probably due to parallel coupling effects; (6) two-magnetic susceptibility versus temperature experiments of the same 2-14 nm sample show that the reversibility during the second heating is due to the formation of new magnetite nanoparticles and growth of those already present during the first heating process.

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16. Linkage relationships of dominant antithrombin III deficiency and the heterochromatic region of chromosome 1

Author

R.E. Magenis, E.W. Lovrien, M.L. Rivas, Timothy A. Donlon, and Matthew Parks

Subjects
Adult, Male, Recombination, Genetic, Genetics, Linkage (software), Genetic Linkage, Heterochromatin, Antithrombin III, Chromosomes, Human, 1-3, Antithrombin III deficiency, Chromosome Mapping, Chromosome, Thrombosis, Biology, medicine.disease, medicine, Humans, Female, Child, Molecular Biology, Genetics (clinical), Genes, Dominant
Published
1978
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17. Linkage study of antithrombin III

Author

S. Rowe, E.W. Lovrien, R. Moreland, S. Goodnight, R.E. Magenis, and M.L. Rivas

Subjects
Genetics, Linkage (software), Male, Recombination, Genetic, Genetic Linkage, Antithrombin, Antithrombin III, Chromosome Mapping, Biology, medicine, Humans, Female, Molecular Biology, Genetics (clinical), medicine.drug
Published
1978

18. The linkage and mapping relationships of 1 qh

Author

R.E. Magenis, D.A. Meyers, M.L. Rivas, Matthew Parks, P.L. Yu, C.G. Palmer, P. M. Conneally, A.D. Merritt, L. Wang, and E.W. Lovrien

Subjects
Linkage (software), Male, Recombination, Genetic, Genetic Linkage, Chromosomes, Human, 1-3, Chromosome Mapping, Biology, Complete linkage, Sex factors, Evolutionary biology, Genetic linkage, Genetics, Blood Group Antigens, Humans, Phosphoglucomutase, Female, Molecular Biology, Genetics (clinical)
Published
1976

19. Linkage group I: the simultaneous estimation of recombination and interference

Author

A.D. Merritt, D.A. Meyers, R.E. Magenis, J.A. Norton, L. Wang, M.L. Rivas, E.W. Lovrien, C.G. Palmer, P. M. Conneally, and P.L. Yu

Subjects
Male, Recombination, Genetic, Linkage (software), Heterozygote, Group (mathematics), Genetic Linkage, Chromosome Mapping, Genetic Variation, Computational biology, Biology, Bioinformatics, Interference (genetic), Models, Biological, Phosphoglucomutase, Amylases, Genetics, Humans, Female, Duffy Blood-Group System, Molecular Biology, Genetics (clinical), Recombination, Probability
Published
1976

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