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NSIS Volume 39 - Part 2

Permanent URI for this collectionhttps://hdl.handle.net/10222/15124

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  • ItemOpen Access
    Table of contents (v. 39, p. 2)
    (Dalhousie Printing Centre, 1991-02) Nova Scotian Institute of Science
  • ItemOpen Access
    The bluntnose sixgill shark Hexanchus griseus (Bonnaterre, 1788), new to the fish fauna of Atlantic Canada.
    (Dalhousie Printing Centre, 1991-02) Gilhen, J.; Coad, B.W.
    Annoucement: THE BLUNTNOSE SIXGILL SHARK HEXANCHUS GRISEUS (BONNATERRE, 1788), NEW TO THE FISH FAUNA OF ATLANTIC CANADA
  • ItemOpen Access
    Synthesis and characterization of a derivative of 2-L-N-(L-glutamyl-Lglutaminyl) amino-3-phenylpropan-1-o1 a proposed C-terminal peptide sequence of metabolites of Trichoderma spp.
    (Dalhousie Printing Centre, 1991-02) Smith, D.G.; Taylor, A.; Walter, J.A.
    The y-benzyl ester of the 2,4-dinitrophenyl ether of 2-l -N-(l-glutamyl-L-glutaminyl) amino-3-phenylpropan-l-ol, the C-terminal sequence of a number of antibiotic fungal peplides, has been synthesized. Evidence is presented that rearrangements did not occur at either of the two peptide bond forming steps. However, 2-l-pyroglutamylamino-3-phenyl-1-(2', 4'-dinitrophenoxy)propane was always a byproduct in the reaction of the glutamylphenylalaninol ether with r-benzyl N-tbutyloxycarbonylglutamic acid. The pyranyl ether protecting group of l-2-(N-L-t-butyloxycarbonylglutamyl) amino-3-phenyl-1-(tetrahydropyranyl-2' -)oxypropane could be selectively hydrolysed with lithium tetrafluoroborate.
  • ItemOpen Access
    Location of foraging activity by black duck (Anas rubripes) broods in a Nova Scotia estuarine marsh.
    (Dalhousie Printing Centre, 1991-02) Murphy, S.T.; Doiron, L.M.; Seymour, N.R.; Garbary, D.J.
    Use of habitat for foraging by black duck (Anas rubripes) broods was investigated in a Nova Scotia estuarine marsh during the 1988 brood rearing season. Some data for other years are reported. Algal and flowering plant species, water chemistry and several physical factors such as depth of water and degree of exposure to wind/ tide, were recorded for each of 51 sampling plots (15 x 15 mI). Ducklings were nonrandomly distributed in the marsh. Principal component analysis (PCA) of utilized sites alone, indicated a relationship between duckling distribution and the presence of floating algal mats, which included species of Rhizoclonium, Cladophora, and Eclocarpaceae. Prior to the appearance of algal mats in late June, ducklings were not associated with specific vegetation types, but were associated with sheltered sites.
  • ItemOpen Access
    Antibiotic activity of the marine fungus Leptosphaeria oraemaris.
    (Dalhousie Printing Centre, 1991-02) Miller, J. D. (J. David); Savard, M.E.
    Two new pigments, obioninene and oraemarin from the lignicolous marine fungus Leptosphaeria oraemaris are described. The effect of salinity on the production of antibiotic compounds from this organism was investigated. Activity of extracts in the HeLa cell bioassay was greatest for fermentations of lower salinity. Toxicity of extracts to brine shrimp larvae was greatest at 14, 18 and 22‰. In contrast, activity against a marine bacterium was greatest in extracts from fermentations from higher salinities (>26‰). The results are discussed in relation to the ecology of L oraemaris.
  • ItemOpen Access
    Studies on the phytoplankton and the water quality of Malpeque Bay, Prince Edward Island, Canada.
    (Dalhousie Printing Centre, 1991-02) Sita Devi, J.; Lakshminarayana, J.S.S.
    The phytoplankton populations of Malpeque Bay, Prince Edward Island, Canada were studied to determine the role, if any, of the water quality in realtion to the biomass, distribution and size of taxonomic groups. The phytoplankton population density was in the range 103 - 106 cells L- 1 and 153 species were identified. Summer blooms of Thalassiosira gravida, T. nordenskioldii. Biddulphia pulchella, B. rhombus, Chaetoceros constrictum, Dinophysis caudata and D. norvegica were observed. The salinity, pH and dissolved oxygen analyses showed that the Malpeque Bay waters were of good quality. Regression analysis of the biomass data and the physico-chemical characteristics of the water indicated a positive correlation between the phytoplankton population density and the dissolved oxygen concentration, the temperature of the water, its salinity and its chlorophyll content.