Isotopic age constraints from electron microprobe U-Th-Pb dates, using a three-dimensional concordia diagram

2005 ◽  
Vol 90 (4) ◽  
pp. 586-591 ◽  
Author(s):  
Y. D. Kuiper
Keyword(s):  
Electron Microprobe ◽  
Three Dimensional ◽  
Isotopic Age ◽  
Concordia Diagram ◽  
Age Constraints

Scanning Electron Microscopy and Electron Microprobe Analysis of Malignant Cell Cultures

1968 ◽  
Vol 26 ◽  
pp. 164-165
Author(s):  
R. I. Johnsson-Hegyeli ◽  
A. F. Hegyeli ◽  
D. K. Landstrom ◽  
W. C. Lane
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Cultures ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Three Dimensional ◽  
Malignant Cell ◽  
Interference Microscopy ◽  
Scanning Electron

Last year we reported on the use of reflected light interference microscopy (RLIM) for the direct color photography of the surfaces of living normal and malignant cell cultures without the use of replicas, fixatives, or stains. The surface topography of living cells was found to follow underlying cellular structures such as nuceloli, nuclear membranes, and cytoplasmic organelles, making possible the study of their three-dimensional relationships in time. The technique makes possible the direct examination of cells grown on opaque as well as transparent surfaces. The successful in situ electron microprobe analysis of the elemental composition and distribution within single tissue culture cells was also reported.This paper deals with the parallel and combined use of scanning electron microscopy (SEM) and the two previous techniques in a study of living and fixed cancer cells. All three studies can be carried out consecutively on the same experimental specimens without disturbing the cells or their structural relationships to each other and the surface on which they are grown. KB carcinoma cells were grown on glass coverslips in closed Leighto tubes as previously described. The cultures were photographed alive by means of RLIM, then fixed with a fixative modified from Sabatini, et al (1963).

Sem visualization of surface charges as a new method

1978 ◽  
Vol 36 (2) ◽  
pp. 326-327
Author(s):  
I. Veres
Keyword(s):  
Electron Microprobe ◽  
Research Work ◽  
Three Dimensional ◽  
New Method ◽  
Surface Charges ◽  
Cell Surfaces ◽  
Sem Micrograph ◽  
Substantial Progress ◽  
Entire Cell ◽  
Labeling Method

The transmissional electronoptical measurement of the electrical surface charges of biomembranes was a part of the new trend of research work “ultramicrobiophisics” introduced by the Author.Recently we succeeded in effecting a quasi three - dimensional visualization by using a modified SEM-technique combined with a colloid labeling method, working as guest - professor at the Uni. of Minnesota, USA. This proved to be a substantial progress: we could study in this way the dispersion of the coulombic forces on entire cell surfaces in contrast with ultrathin sectioning of labeled cells.Objects are prefixed using 1% solution of Glutar- Aldehyde, then they are labeled with positively or negatively charged colloid AgI solution, newly prepared by using o, o2 M solutions of AgNO3and KI. Therafter the labeled and washed objects are dried in a series of ethanol and twice in Dimethyl- Propilenoxide under centrifugation. The dispersion of the surface charges is measured by counting the adsorbed sol particles on the SEM micrograph and / or using microanalyzer resp. electron microprobe.

Lead and Mg isotopic age constraints on the evolution of the HED parent body

2017 ◽  
Vol 52 (6) ◽  
pp. 1233-1243 ◽  
Author(s):  
Martin Schiller ◽  
James N. Connelly ◽  
Martin Bizzarro
Keyword(s):  
Parent Body ◽  
Isotopic Age ◽  
Age Constraints

The Mesoproterozoic Basement at the San Rafael Block, Mendoza Province (Argentina): Geochemical and Isotopic Age Constraints

2017 ◽  
pp. 19-58 ◽  
Author(s):  
Carlos A. Cingolani ◽  
Miguel A. S. Basei ◽  
Ricardo Varela ◽  
Eduardo Jorge Llambías ◽  
Farid Chemale ◽  
...  
Keyword(s):  
Isotopic Age ◽  
San Rafael ◽  
Age Constraints

Age constraints on the Cadomian evolution of the Teplá Barrandian unit (Bohemian Massif) through electron microprobe dating of metamorphic monazite

2000 ◽  
Vol 150 (4) ◽  
pp. 627-639 ◽  
Author(s):  
Gernold Zulauf ◽  
Franz Schitter ◽  
Gudrun Riegler ◽  
Fritz Finger ◽  
Jiri Fiala ◽  
...  
Keyword(s):  
Electron Microprobe ◽  
Bohemian Massif ◽  
Age Constraints

U – Pb age constraints for the lithotectonic evolution of the Grenville Province along the Mauricie transect, Quebec

1997 ◽  
Vol 34 (3) ◽  
pp. 299-316 ◽  
Author(s):  
David Corrigan ◽  
Otto van Breemen
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
High Grade ◽  
Isotopic Age ◽  
Grenville Province ◽  
Zircon Age ◽  
South Central ◽  
Continental Arc ◽  
Structural Levels ◽  
Age Constraints

New U–Pb zircon and monazite ages on 12 samples from the Mauricie transect in Quebec provide constraints on the lithologic and tectonic evolution of the south-central Grenville Province. From lowest to highest structural levels, the Mékinac, Shawinigan, and Portneuf – St. Maurice domains are identified on the basis of protolith age, tectonic overprint, and plutonism. The structurally highest Portneuf – St. Maurice domain consists of remnants of an island arc (Montauban Group) that was deformed and metamorphosed before and during the intrusion of continental arc plutons (La Bostonnais complex). A tonalitic orthogneiss yielding a [Formula: see text] zircon age suggests that most of the structurally underlying Mékinac and Shawinigan domains consist of orthogneisses that may be high-grade equivalents of the La Bostonnais complex. A voluminous metasedimentary unit occurring in the Shawinigan domain (St. Boniface unit) was deposited between ca. 1.18 and 1.09 Ga, precluding any correlation with the ca. 1.45 Ga Montauban Group. Two suites of anorthosite–mangerite–charnockite–granite (AMCG) plutonic rocks are identified on the basis of field relationships and isotopic age. A megacrystic granite belonging to the "older" AMCG suite yielded a [Formula: see text] zircon age. Three plutons from the "younger" suite yielded ages of [Formula: see text], 1059 ± 2, and 1056 ± 2 Ma. The Mékinac and Shawinigan domains, excluding the younger AMCG plutons, were penetratively deformed at granulite to uppermost amphibolite facies during west-northwest-directed thrusting between 1.15 and 1.09 Ga. At ca. 1.09 Ga, a transition from contraction to oblique extension resulted in the juxtaposition of the "cold" Portneuf – St. Maurice domain with the "hot" Shawinigan domain, along the Tawachiche shear zone. Oblique extension may have been active from ca. 1.09 to 1.04 Ga and was contemporaneous with emplacement of the younger AMCG suite.

New U–Pb and Ar/Ar isotopic age constraints on the timing of Eocene magmatism, Fort Fraser and Nechako River map areas, central British Columbia

2001 ◽  
Vol 38 (4) ◽  
pp. 679-696 ◽  
Author(s):  
Nancy C. Grainger ◽  
Michael E. Villeneuve ◽  
Larry M. Heaman ◽  
Robert G. Anderson
Keyword(s):  
British Columbia ◽  
Isotopic Age ◽  
Age Constraints
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