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44 results on '"LANGENBERG, WILLEM"'

12. Your Views.

Author

LAWRENCE, J. D., FOLEY, DAVE, BRUINSMA, ROBERT, SMITH, PEGGY, SHAW, JACKIE, MARTIN, RAY, STEELE, MILO, and LANGENBERG, WILLEM

Subjects
EMISSIONS (Air pollution), RAILROADS
Abstract

GIVEN HOW EXPENSIVE LRT IS, and the province's reluctance to fund its portion properly, I can't see any way high-speed rail would make money in Alberta. Perhaps Alberta Views (AV) should review AV's latest album…! RE "EDMONTON TO CALGARY IN AN hour", May: I was expecting a dismissable techno-fantasy about high-speed trains. [Extracted from the article]

Published
2022

13. THE NEAR-SPINELESS <em>TRACHELOMONAS GRANDIS</em> (EUGLENOPHYCEAE) SUPERFICIALLY APPEARS SPINY BY ATTRACTING BACTERIA TO ITS SURFACE.

Author

Rosowski, James R. and Langenberg, Willem G.

Subjects
*BACTERIAL adhesion, *EUGLENOIDS, *MUCILAGE, *ALGAE, *TRACHELOMONAS
Abstract

Trachelomonas grandis Singh has a mucilaginous, highly porous mineralized lorica (envelope) generally without ornamentation except occasionally for a few short, tapered, anterior or posterior spines. However, as our first cultures of this species aged, rod-shaped structures appeared on the loricas. That these surface projections were bacteria was determined by scanning and transmission electron microscopy. The bacteria, 2-6 μm Long with rounded apices, were oriented perpendicular to the exterior lorica surface and were attatched on one end by apically produced tie-down fibres. The bacteria also secreted fibers over their entire surface, forming a network between them that collapsed during specimen preparation for scanning electron microscopy. The density of the surface bacteria increased with time until the lorica took on a "spiny" appearance superficially similar to lorica extensions of algal origin. In mature algal specimens, an estimated 1200-1800 bacteria per lorica occurred as a monolayer, the maximum number related to the surface area of the always motionless while attached, showed putative evidence of budding. Fission fomed short chains of up to three cells on the lorica. Our cultures maintained this association for 8 years (1972-1979). However, cultures ordered for further study in the past year have failed to develop loricas with more than just a few bacterial cells, and most have none. [ABSTRACT FROM AUTHOR]

Published
1994
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16. Silicone Additive Facilitates Epoxy Plastic Sectioning

Author

Langenberg, Willem

Abstract

Cutting quality of epoxy plastics is greatly improved by addition of 1% Dow Corning 200 fluid silicone plastic additive of 0.65 centistoke viscosity to formulations presently in use for ultramicrotomy and electron microscopy. The additive does not appreciably alter staining characteristics or reduce mechanical strength of ultrathin sections. Glass knives lasted 5 to 15 times longer when cutting modified rather than unmodified plastic. The additive did not impart electron density to any of the plastics used.

Published
1982
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17. Epoxy Film Separable from Glass Surfaces for Selective Light and Electron Microscopy of Tissue and in situ Grown Cells

Author

Langenberg, Willem, Schroeder, Helen, Welch, Ardyce, and Cook, Gilbert

Abstract

Plant tissues, fungal spores and cell monolayers grown on sterile, carbon-coated coverslips, were fixed, dehydrated, and then embedded in Araldite 6005, Epon 812 and Spurr's low viscosity plastic by conventional means. Tissue pieces were placed on carbon-coated microscope slides in a few drops of plastic and covered with a carbon-coated glass coverslip. Cells grown on carbon-coated coverslips, were inverted on a few drops of plastic on carbon-coated slides. The plastic was polymerized at 65 C. The epoxy film, containing the cells or tissue, was removed intact by slipping a razor blade between glass surface and plastic. Cells and tissue in the released film were examined by phase microscopy. Immersion oil was washed off with amyl acetate and the area of interest marked and cut out with a fine-pointed scalpel or razor blade. The cut-out was then mounted on a carrier with epoxy glue for thin sectioning at the desired angle.

Published
1972
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18. LETTERS.

Author

LANGENBERG, WILLEM, KRUYER, JAN, GRIFFITHS, MARY, DYER, SIMON, SWANN, DAVID, STERLE, FRANK, EVANS, IEUAN R., ODSEN, BRADLEY V., CASS, CAROL, HERMARY, HUGH, and GAGNE, MARTIN

Subjects
CARBON dioxide & the environment, CLIMATE change, CARBON taxes
Published
2019

43. LETTERS.

Author

RITCHIE, GORD, COOPER, BARRY, MACDONALD, JERRY, CABLE, TERRENCE, VILLIGER, NICKOLEJ, OWEN, DAVID, LANGENBERG, WILLEM, and DURAND, DONNA

Subjects
STUDENT attitudes, REFUGEES
Abstract

Several letters to the editor are presented in response to articles in previous issues including "The Corporate U" by Evan Osenton in September 2016 issue; "Six Waves of Refugees" by George Melnyk in September 2016 issue; and "University Debased" by James Turk in September 2016 issue.

Published
2016

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