NSIS Volume 40 - Part 2
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Item Open Access Table of contents (v. 40, p. 2)(1995) Nova Scotian Institute of ScienceItem Open Access Front matter(1995) Nova Scotian Institute of ScienceItem Open Access Obituary of W.J. Chute(1995) Nova Scotian Institute of ScienceItem Open Access A new two-dimensional lattice of coordination number five(1995) Betts, D.D.An introduction is given to the symmetrical square and triangular two-dimensional Bravais lattices. Next the two most symmetric two-dimensional, non-Bravais regular lattices are introduced - the honeycomb and the kagome - each derived from the triangular lattice. These four lattices have coordination numbers of four, six, three and four respectively. A third high symmetry two dimensional non-Bravais regular lattice, also derived from the triangular lattice is introduced. The remarkable fact about this previously unknown lattice is that its coordination number is five.Item Open Access Curved arrows and the electronic theory of organic chemistry(1995) Leffek, K.T.; Pincock, J.A.The historical genesis of the curved arrow in organic chemistry is described during the debate in the pages of Chemistry and Industry (Review Section) from 1923 to 1926 between Robert Robinson, Christopher Ingold and others. Following Ingold 's article in Chemical Reviews in 1934, the gradually increasing use of the curved arrow, first in advanced research level books on physical organic chemistry and then in entry level organic chemistry textbooks, is discussed.Item Open Access A first principles approach to thermal conductivity measurements of solids(1995) Murashov, V.V.; Bessonette, P.W.R.; White, M.A.Although knowledge of heat conduction is crucial to the understanding of many practical everyday phenomena, the exposure of university students at the undergraduate level to this subject is often limited. With the intent of improving this situation, we describe the design of a simple apparatus for measurement of the thermal conductivity of materials, using components that could be found in most undergraduate laboratories. Use of this apparatus clearly illustrates the basic principles of heat conduction, as the data collected enable the determination of the thermal conductivity of a material directly from the defining equation. To demonstrate the use of this apparatus in determining the thermalconductivity of materials, we describe the result obtained from measurements of a plate of aluminium alloy.Item Open Access The synthesis of 1,2-bis(4’-(triazenyl)phenyl)ethanes(1995) Brown, D.S.; Vaughan, K.; Merrin, M.P.A series of1,2·bis-(4'-(triazenyl)phenyl)ethanes (2) has been synthesised by bis-diazotization of ethylene dianiline, and coupling of the resulting bis-diazonium salt with appropriate alkyl or dialkylamines. The bis-triazenes have been characterized by infrared (ir) and nuclear magnetic resonance spectroscopy (nmr), mass spectrometry and elemental analysis. Line broadening in me nmr spectra of the bis-triazene is attributed to a combination of conformational equilibria and hindered rotation around the N^1·N^2 triazene bond and also around the C-C bond of the ethylene bridge.Item Open Access The biodegredation of L-tyrosine by trichoderma hamatum to trichoviridin and related compounds(1995) McAlees, A.J.; Taylor, A.Trichoviridin (1) is shown to be a degradation product L-tyrosine by cultures of Trichoderma hamatum. The specific radioactivity of trichoviridin thus formed was lower than that of 3-isocyanocyclopent-2--enylidene propionic add (2) a congenic catabolite which contains an additional labelled carbon atom from U14-C-l4C-L-tyrosine. Evidence is presented that two other neutral isocyanides produced by the fungus are also degradation products of tyrosine.Item Open Access Migration of salvelinus fontinalis in relation to the date of spring thaw (ice-out) of Eight Island Lake, Guysborough County, Nova Scotia(1995) Whiteway, S.G.; McCulloch, A.W.In the period 1965·1992 the mean difference in days between the spring thaw ("ice-out") of EightIsland lake in Guysborough County, Nova Scotia and the first catch, by sport fishermen, of Salvelinus fontinalis was 11.5±2.7., despite the spread of ice-out during the same years, over a period of 43 days (March 24 - May 6).