NSIS Volume 38 - Part 3/4
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Item Open Access Table of contents (v. 38, p. 3/4)(Dalhousie Printing Centre, 1989-12) Nova Scotian Institute of ScienceItem Open Access Proceedings of Meetings, Session of 1987-88. including President's Report(Dalhousie Printing Centre, 1989-12) Nova Scotian Institute of ScienceItem Open Access Obituary: C.R. Masson(Dalhousie Printing Centre, 1989-12) Nova Scotian Institute of ScienceItem Open Access Ventilation of a tunnel beneath Northumberland Strait.(Dalhousie Printing Centre, 1989-12) Milligan, G.C.After brief comparison of ventilation schemes used in three long European tunnels, several possible methods of ventilating a 13 km submarine vehicular tunnel are examined. Probably the most suitable is one supplying fresh air from a smaller ventilation tunnel parallel to that carrying the traffic.Item Open Access Purifying algal cultures - A review of chemical methods.(Dalhousie Printing Centre, 1989-12) McCracken, I.R.Chemical methods that have been used to obtain axenic algal cultures are reviewed. The methods include the use of antibiotics, hypochlorite, iodine, hormones, phenol and detergents singly or in combination. Data are given on the use of antifungal agents such as caffeine, griseofulvin and the polyene macrolides e.g. nystatin. When appropriate, the use of physical methods e.g. gel adsorption, sonication, filtration, and osmosis is described where these techniques are used in conjugation with antifungal/antibacterial compounds.Item Open Access Investigations of marine algae of Nova Scotia XVII - Vertical and geographic distribution of marine algae on rocky shores of the Maritime Provinces.(Dalhousie Printing Centre, 1989-12) Novaczek, I.; McLachlan, J.A review is given of the physical features of three coastal environments of eastern Canada: the Gulf of St. Lawrence, the open Atlantic coast, and the Bay of Fundy. Intertidal and sublittoral regions of these environments were surveyed. Vertical limits of common macrophytic algae and their relative abundances were documented and a species list compiled for sectors of each coastal environment. Differences among the three coastal enviornments in terms of species composition and vertical distributions could be related to differences in ice scour, tidal amplitude, wave exposure, intertidal slope, water temperature and geology. Sites on the outer Atlantic coast generally showed patterns of zonation corresponding with the typical pattem for the North Atlantic Ocean, whereas both Fundy and Gulf shores deviated from this pattern. The vegetation belts dominated by fucoids, red turf algae and kelp were found at progressively lower intertidal or sublittoral levels moving from the Bay of Fundy to the Atlantic and from Atlantic to Gulf shores. The changing pattern from the Fundy to Atlantic shores was correlated mainly with changing tidal amplitudes and intertidal slopes. The difference between Atlantic and Gulf shores was primarily owing to the effects of ice scour. Certain species found sublittorally in other areas occurred intertidally in the Bay of Fundy. For some species, variations in physical factors accounted for a high proportion of the variability in vertical limits. Whether this is the result of direct effects of physical factors or a consequence of changing biotic interactions requires experimental analysis. Nutrient enrichment of southwest Atlantic shores may have produced a slight increase in species diversity of this environment. Differences in the temperature regimes of the three coastal environments were clearly reflected in spedes compositions. Some cold-temperate to Arctic species were absent from the warmest environment, the Gulf, while certain warm-temperate species were restricted to Gulf waters.Item Open Access Front Matter (v. 38, p. 3/4)(Dalhousie Printing Centre, 1989-12) Nova Scotian Institute of Science