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Of Data (of + data)

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Life Sciences50%

Kinds of Of Data

  • variety of data
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    Selected Abstracts

    DO PLASTID-RELATED CHARACTERS SUPPORT THE CHROMALVEOLATE HYPOTHESIS?,

    JOURNAL OF PHYCOLOGY, Issue 3 2005
    Andrzej Body
    According to the idea of secondary endosymbiosis, plastids with three and four envelope membranes have evolved from either red or green algal endosymbionts engulfed by phagotrophic protozoans. Although this hypothesis is nowadays commonly accepted, the number of secondary endosymbioses still remains controversial. One of the models, known as the "chromalveolate" hypothesis, postulates that the 4 membrane-bound plastids of Chromista and the 3 or 4 membrane-bound plastids of Alveolata result from a single secondary endosymbiosis involving a rhodophyte as the endosymbiont. Although this model has found many followers, a variety of data clearly contradict it. The ideas that became the direct inspiration for formulation of the "chromalveolate" hypothesis are also now questionable. In this comment, I discuss all these problems in the light of the most recent phylogenetic, cytological, and genomic data. [source]

    Banks as Liquidity Providers: An Explanation for the Coexistence of Lending and Deposit-Taking

    THE JOURNAL OF FINANCE, Issue 1 2002
    Anil K. Kashyap
    What ties together the traditional commercial banking activities of deposit-taking and lending? We argue that since banks often lend via commitments, their lending and deposit-taking may be two manifestations of one primitive function: the provision of liquidity on demand. There will be synergies between the two activities to the extent that both require banks to hold large balances of liquid assets: If deposit withdrawals and commitment takedowns are imperfectly correlated, the two activities can share the costs of the liquid-asset stockpile. We develop this idea with a simple model, and use a variety of data to test the model empirically. [source]

    Reevaluating suitable habitat for reintroductions: lessons learnt from the eastern barred bandicoot recovery program

    ANIMAL CONSERVATION, Issue 2 2010
    C. N. Cook
    Abstract Reintroduction and translocation programs are widely used conservation tools but their success rates are low. Poor success rates for reintroduction programs are commonly attributed to insufficient knowledge of species' habitat requirements, especially if they are critically endangered. Yet conservation managers are frequently required to make decisions about suitable reintroduction sites when information is incomplete or uncertain. A widely used strategy to assist the selection of reintroduction sites , habitat suitability models , may rely on assumptions and simplifications to fill gaps in existing data. It is essential that these models are then evaluated and refined as new evidence becomes available. In this study, we examine the effectiveness of a reintroduction program based on habitat suitability modelling: that for the critically endangered eastern barred bandicoot Perameles gunnii in Australia. After collecting a variety of data from the reintroduction sites, we found that habitat preferences for this species could be accurately predicted using a simple logistic regression model within two predictor variables rather than the five previously used to select reintroduction sites. This made it possible to better focus limited resources on the most suitable reintroduction sites. We believe that building such a process of review into a reintroduction program can contribute to improving its success, while ensuring that scarce conservation resources are used more effectively. [source]

    Ultrasonographic characteristics of soft tissue tumours in dogs

    AUSTRALIAN VETERINARY JOURNAL, Issue 8 2009
    ZHK Loh
    Objective To identify and describe the ultrasonographic features of soft tissue tumours in dogs. Procedure Superficial soft tissue tumours of various histological types, including mast cell tumours (MCTs) and soft tissue sarcomas (STSs), were evaluated. Ultrasound was used to visualise internal characteristics of the tumour, including vascularity. Tumours were categorised according to size, shape, margin definition, tissue plane mobility, echogenicity, echotexture, acoustic shadowing or enhancement and vessel distribution. Objective measurements of intratumoural blood flow included velocities and maximal perfused cross-sectional area (fractional area). Logistic regression models incorporating a variety of data were used in an attempt to predict the histopathological type of tumours. Results,, The logistic regression model defined by the parameters echotexture, margin definition and presence of subcapsular vessels was highly predictive of MCTs (> 73%; P = 0.024). Several other trends, including a larger size for STSs and less vascularity for both MCTs and STSs, were observed, but did not reach statistical significance. Conclusion,, This preliminary study has shown the potential diagnostic value of ultrasound in differentiating soft tissue tumours. However, at present, ultrasound cannot replace biopsy and histopathological evaluation for tumour diagnosis. [source]