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  2. The Developmental Anatomy of Cryptogeal Germination in Bunya Pine (Araucaria bidwillii).

    by Burrows, G.E.; Stockey, R.A.

    Bunya pine (Araucaria bidwillii Hooker) produces large seeds that consist of a massive megagametophyte that surrounds an...

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  3. Developmental Basis of an Anatomical Novelty: Heteroarthrocarpy in Cakile lanceolata and Erucaria erucarioides (Brassicaceae)

    by Hall, J.C.; Tisdale, T.E.; Donohue, K.; Kramer, E.M.

    To understand the developmental basis of a novel anatomical feature, we present a comparative developmental study of an ecologically...

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  4. Diet and Growth of Northern Pike in the Absence of Prey Fishes: Initial Consequences for Persisting in Disturbance-Prone Lakes.

    by Venturelli, P. A.; Tonn, W. M.

    The northern pike Esox lucius is a renowned piscivore, but will prey opportunistically on invertebrates (e.g., in small lakes...

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  5. Dietary lipids containing gangliosides reduce Giardia muris infection in vivo and survival of Giardia lamblia trophozoites in vitro

    by Suh, M.; Belosevic, M.; Clandinin, M.T.

    We examined whether a ganglioside supplemented diet affected the course of Giardia muris infection in mice and survival of Giardia...

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  6. Differences in Phyllotreta cruciferae and Phyllotreta striolata (Coleoptera: Chrysomelidae) responses to neonicotinoid seed treatments

    by Tansey, J. A.; Dosdall, L. M.; Keddie, B. A.; Sarfraz, R. M.

    Abstract: Insecticidal seed treatments are used commonly throughout the Northern Great Plains of North America to systemically...

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  7. Differences in replication of a DNA template containing an ethyl phosphotriester by T4 DNA polymerase and Escherichia coli DNA polymerase I

    by Tsujikawa, L.; Weinfield, M.; Reha-Krantz, L.J.

    A DNA template containing a single ethyl phosphotriester was replicated in vitro by the bacteriophage T4 DNA polymerase and...

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  8. Different scales of spatial segregation of two species of feather mites on the wings of a passerine bird

    by Mestre, A.; Mesquita-Joanes, F.; Proctor, H.; Monros, J. S.

    The "condition-specific competition hypothesis" proposes that coexistence of 2 species is possible when spatial or temporal...

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  9. Differential aluminum tolerance of high-yielding, early maturing Canadian wheat cultivars and germplasm

    by Briggs, K.G.; Taylor, G.J.; Sturgess, I.; Hoddinott, J.

    Twenty-eight spring wheat (Triticum aestivum) cultivars were tested for tolerance to aluminum (Al) using solution culture...

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  10. Differential exudation of polypeptides by roots of aluminum-resistant and aluminum-sensitive cultivars of Triticum aestivum L. in response to aluminum stress

    by Basu, U.; Basu, A.; Taylor, G. J.

    Cultivars of Triticum aestivum differing in resistance to Al were grown under aseptic conditions in the presence and absence...

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  12. Differential responses of littoral communities to ultraviolet radiation in an alpine lake

    by Vinebrooke, R. D.; Leavitt, P. R.

    Differential sensitivities of benthic and planktonic communities to UV radiation may involve differences in habitat conditions...

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  13. Dinosaur speed demon: the caudal musculature of Carnotaurus sastrei and implications for the evolution of South American abelisaurids

    by Persons IV, W. S.; Currie, P. J.

    In the South American abelisaurids Carnotaurus sastrei, Aucasaurus garridoi, and, to a lesser extent Skorpiovenator bustingorryi,...

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  14. Direct Measurement of Aluminum Uptake and Distribution in Single Cells of Chara corallina

    by Taylor, G. J.; McDonald-Stephens, J. L.; Hunter, D. B.; Bertsch, P. M.; Elmore, D.; Rengel, Z.; Reid, R. J.

    Quantitative information on the uptake and distribution of Al at the cellular level is required to understand mechanisms...

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  15. Dispersal data and the spread of invading organisms

    by Kot, M.; Lewis, M. A.; van den Driessche, P.

    Models that describe the spread of invading organisms often assume that the dispersal distances of propagules are normally...

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  16. Dispersal, Population Growth, and the Allee Effect: Dynamics of the House Finch Invasion of Eastern North America

    by Veit, R.R.; Lewis, M.A.

    Since about 1940, when they were first released in the new York City area, house finches (Carpodacus mexicanus) have multiplied...

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  17. Disruption of a belowground mutualism alters interactions between plants and their floral visitors

    by Cahill, J. F.; Elle, E.; Smith, G. R.; Shore, B. H.

    Plants engage in diverse and intimate interactions with unrelated taxa. For example, aboveground. oral visitors provide pollination...

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  18. Distinguishing angiophytes from the earliest angiosperms: A Lower Cretaceous (Valanginian-Hauterivian) fruit-like reproductive structure

    by Stockey, R.A.; Rothwell, G.W.

    A remarkably diverse Lower Cretaceous (Valanginian-Hauterivian) fl ora at Apple Bay, Vancouver Island, preserves seed plants at...

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  19. Distribution and first reports of Branchiobdellida (Annelida: Clitellata) on crayfish in the prairie provinces of Canada

    by Williams, B. W.; Gelder, S. R.; Proctor, H. C.

    ABSTRACT.—Orconectes virilis (northern crayfish) were collected from 67 sites in Alberta, Saskatchewan, Manitoba, and far-western...

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  20. Distribution of entocytheridae (Crustacea: Ostracoda) in the northern prairies of north america and reports of opportunistic clitellate annelids on crayfish hosts.

    by Williams, B. W.; Williams, K. L.; Gelder, S. R.; Proctor, H. C.

    ABSTRACT.—Northern crayfish, Orconectes virilis (Hagen, 1870), were collected from 89 sites across Alberta, Saskatchewan,...

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