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Chalk River Laboratories

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About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.


Papers
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Journal ArticleDOI
TL;DR: Evidence that poplar SSPs and VSPs exhibit homology is provided, and that expression is neither tissue-specific nor regulated solely by photoperiod is provided.
Abstract: We investigated the synthesis and accumulation of vegetative storage proteins (VSPs) in poplar plantlets and the homology between poplar seed storage proteins (SSPs) and VSPs. One-dimensional SDS polyacrylamide gel electrophoresis confirmed that both seed and vegetative storage proteins contained two predominant polypeptides of MW 32 and 36 kDa, but the subunit composition of the polypeptides differed. The 32- and 36-kDa polypeptides were highly abundant in basal leaves, stems, and roots of poplar plantlets. The 36-kDa subunit was synthesized in all plantlet tissues examined, but the 32-kDa subunit was not, suggesting that the 36-kDa polypeptide is a precursor of the 32-kDa polypeptide. The 36- and 32-kDa polypeptides of both SSPs and VSPs were glycosylated and both were found to be albumins. In addition, both polypeptides cross-reacted with a VSP antibody. Protein fingerprint patterns generated with two different proteolytic enzymes were identical for the 36-kDa polypeptide isolated from seeds or from stem tissue. Our study provides evidence that poplar SSPs and VSPs exhibit homology, and that expression is neither tissue-specific nor regulated solely by photoperiod.

26 citations

Book ChapterDOI
TL;DR: Small-angle neutron scattering (SANS) is a technique able to characterize structural features on nanometer length scales and can be used to probe freely suspended membranes and shows promise to characterize nanometer-sized domains in model membranes.
Abstract: The detection and characterization of lateral heterogeneities or domains in lipid mixtures has attracted considerable interest, because of the roles that such domains may play in biological function. Studies on both model and cell membranes demonstrate that domains can be formed over a wide range of length scales, as small as nanometers in diameter up to microns. However, although the size and shape of micron-sized domains are readily visualized in freely suspended vesicles, by techniques such as fluorescence microscopy, imaging of nanometer-sized domains has thus far been performed only on substrate-supported membranes (through, e.g., atomic force microscopy), whereas additional evidence for nanodomains has depended on indirect detection (through, e.g., nuclear magnetic resonance or fluorescence resonance energy transfer). Small-angle neutron scattering (SANS) is a technique able to characterize structural features on nanometer length scales and can be used to probe freely suspended membranes. As such, SANS shows promise to characterize nanometer-sized domains in model membranes. The authors have recently demonstrated the efficacy of SANS to detect and characterize nanodomains in freely suspended mixed lipid vesicles.

26 citations

Journal ArticleDOI
TL;DR: The lattice parameters of Fe-15 Cu, Fe-2% Cu and Fe-1% Co binary alloys were determined by means of neutron diffraction at temperatures around the austenite-ferrite phase transformation as mentioned in this paper.

26 citations

Journal ArticleDOI
01 May 1996-Genetics
TL;DR: It is proposed that the REC1 gene product functions in a surveillance system operating during S-phase and G2 to find and repair stretches of DNA with compromised integrity and to communicate with the cell cycle apparatus.
Abstract: Mutation in the REC1 gene of Ustilago maydis results in extreme sensitivity to killing by ultraviolet light. The lethality of the rec1-1 mutant was found to be partially suppressed if irradiated cells were held artificially in G2-phase by addition of a microtubule inhibitor. This mutant was also found to be sensitive to killing when DNA synthesis was inhibited by external means through addition of hydroxyurea or by genetic control in a temperature-sensitive mutant strain defective in DNA synthesis. Flow cytometric analysis of exponentially growing cultures indicated that wild-type cells accumulated in G2 after UV irradiation, while rec1-1 cells appeared to exit from G2 and accumulate in G1/S. Analysis of mRNA levels in synchronized cells indicated that the REC1 gene is periodically expressed with the cell cycle and reaches maximal levels at G1/S. The results are interpreted to mean that a G2-M checkpoint is disabled in the rec1-1 mutant. It is proposed that the REC1 gene product functions in a surveillance system operating during S-phase and G2 to find and repair stretches of DNA with compromised integrity and to communicate with the cell cycle apparatus.

26 citations

Journal ArticleDOI
TL;DR: In this paper, the residual intergranular strains generated by uniaxial plastic deformations of +5.6 and −6.0% in samples of Inconel-600 are presented as strain polefigures for the (111), (002), (220), and (113) reflections of the face-centered cubic structure.
Abstract: Neutron diffraction measurements of the residual intergranular strains generated by uniaxial plastic deformations of +5.6 and −6.0% in samples of Inconel-600 are presented as strain pole-figures for the (111), (002), (220), and (113) reflections of the face-centered cubic structure. The results agree with earlier unusual results obtained for Inconel-600 and also show that the intergranular strains change sign when the sign of the plastic deformation is reversed. The results provide a test of the elasto-plastic self-consistent model with which they are critically compared.

26 citations


Authors

Showing all 2298 results

NameH-indexPapersCitations
Michael D. Guiver7828820540
Robert J. Birgeneau7858722686
Mike D. Flannigan7121121327
Martin T. Dove6139614767
Luis Rodrigo5834112963
André Longtin5626016372
David Mitlin5619615479
John Katsaras552209263
John E. Greedan5539112171
Gang Li484067713
Matthew G. Tucker452247288
Bruce D. Gaulin452846698
Erick J. Dufourc431445882
Norbert Kučerka431197319
Stephen J. Skinner421948522
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202284
202176
202072
201974
2018104