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  1. AU="Walker, Andrew B"
  2. AU="Deol, Sundeep S"
  3. AU="Novo, Evlyn Márcia Moraes de Leão"

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  1. Article: Lumbosacral ectopic nephrogenic rest unassociated with spinal dysraphism.

    Horenstein, Marcelo G / Manci, Elizabeth A / Walker, Andrew B / Dehner, Louis P

    The American journal of surgical pathology

    2004  Volume 28, Issue 10, Page(s) 1389–1392

    Abstract: Nephrogenic rests (NRs) are thought to originate from persistent nephrogenic blastema and are considered precursor lesions of Wilms' tumor (WT). These rests usually occur as perilobar and intralobar lesions in the kidney and, rarely, in ectopic sites. We ...

    Abstract Nephrogenic rests (NRs) are thought to originate from persistent nephrogenic blastema and are considered precursor lesions of Wilms' tumor (WT). These rests usually occur as perilobar and intralobar lesions in the kidney and, rarely, in ectopic sites. We report a midline lumbosacral ectopic NR in a healthy full-term newborn male with no family history of WT or WT-associated syndromes. The NR presented as a soft polypoid mass covered by normal skin. An MRI study revealed no lumbosacral spine abnormalities and no communication with the vertebral canal. The resected mass measured 3 cm and contained fat and had a central 1.2-cm solid nodule. The nodule was composed of blastema, epithelial elements (mature tubules and nephrons), and abundant stroma. No other somatic tissue elements were identified after complete microscopic examination. There are 4 cases of NRs reported in the lumbosacral area associated with spinal dysraphism, and only 2 cases, in addition to our report, unassociated with spinal abnormalities. The pathogenesis of heterotopic immature nephrogenic tissue remains a source of conjecture and speculation. If these lesions are heterotopic rests, their potential for neoplastic progression is probably quite limited, but if a monodermal teratoma, then more scrupulous clinical follow-up is warranted.
    MeSH term(s) Choristoma/pathology ; Choristoma/surgery ; Humans ; Infant, Newborn ; Kidney ; Lumbosacral Region ; Male ; Spinal Dysraphism
    Language English
    Publishing date 2004-07-29
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 752964-8
    ISSN 1532-0979 ; 0147-5185
    ISSN (online) 1532-0979
    ISSN 0147-5185
    DOI 10.1097/01.pas.0000131557.49774.29
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Habitat selection by female Stone's sheep in relation to vegetation, topography, and risk of predation

    WALKER, Andrew B. D / PARKER Katherine L / GILLINGHAM Michael P / GUSTINE David D / LAY Roberta J

    Écoscience. 2007 Mar., v. 14, no. 1

    2007  

    Abstract: Stone's sheep (Ovis dalli stonei) are susceptible to anthropogenic disturbances, but few data have been available to help minimize impacts. We used the movements of individuals to define use and availability, and resource-selection functions (RSF) and ... ...

    Abstract Stone's sheep (Ovis dalli stonei) are susceptible to anthropogenic disturbances, but few data have been available to help minimize impacts. We used the movements of individuals to define use and availability, and resource-selection functions (RSF) and the information-theoretic approach to examine seasonal habitat selection and interannual variation in selection of attributes by groups of Stone's sheep. Movement rates of Stone's sheep followed consistent yearly patterns, with highest rates occurring in summer and fall. Models that contained vegetation, topography, and risk of predation best explained resource selection. Topographic features ranked better, however, than components of vegetation or risk of predation from grizzly bears (Ursus arctos) and wolves (Canis lupus) at explaining habitat selection. Selection strategies were variable among groups of Stone's sheep and between years within groups even though consistencies in selection for steep slopes, ridge-like topography, south aspects, and upper elevations were common. This research provides the first comprehensive analysis of habitat selection by Stone's sheep, which show strong fidelity to seasonal ranges but also exhibit behavioural plasticity in selection of attributes within those ranges.Nomenclature: Hultéén, 1974; Nowak & Paradiso, 1983.
    Keywords Canis lupus ; Ovis dalli ; Ursus arctos ; anthropogenic activities ; autumn ; females ; habitat preferences ; models ; predation ; risk ; sheep ; summer ; topography ; vegetation ; wolves ; information-theoretic approach ; movement ; Ovis dalli stonei ; risk of predation ; selection ; Stone's sheep ; approche baséée sur la thééorie de l'information ; mouflon de Stone ; mouvement ; risque de préédation ; séélection
    Language English
    Dates of publication 2007-03
    Size p. 55-70.
    Publishing place ÉÉCOSCIENCE
    Document type Article
    ZDB-ID 2155785-8
    ISSN 1195-6860 ; 1195-6860
    ISSN (online) 1195-6860
    ISSN 1195-6860
    DOI 10.2980%2F1195-6860%282007%2914%5B55%3AHSBFSS%5D2.0.CO%3B2
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Habitat selection by female Stone's sheep in relation to vegetation, topography, and risk of predation

    WALKER, Andrew B. D. / PARKER Katherine L. / GILLINGHAM Michael P. / GUSTINE David D. / LAY Roberta J.

    Écoscience

    Volume v. 14,, Issue no. 1

    Abstract: Stone's sheep (Ovis dalli stonei) are susceptible to anthropogenic disturbances, but few data have been available to help minimize impacts. We used the movements of individuals to define use and availability, and resource-selection functions (RSF) and ... ...

    Abstract Stone's sheep (Ovis dalli stonei) are susceptible to anthropogenic disturbances, but few data have been available to help minimize impacts. We used the movements of individuals to define use and availability, and resource-selection functions (RSF) and the information-theoretic approach to examine seasonal habitat selection and interannual variation in selection of attributes by groups of Stone's sheep. Movement rates of Stone's sheep followed consistent yearly patterns, with highest rates occurring in summer and fall. Models that contained vegetation, topography, and risk of predation best explained resource selection. Topographic features ranked better, however, than components of vegetation or risk of predation from grizzly bears (Ursus arctos) and wolves (Canis lupus) at explaining habitat selection. Selection strategies were variable among groups of Stone's sheep and between years within groups even though consistencies in selection for steep slopes, ridge-like topography, south aspects, and upper elevations were common. This research provides the first comprehensive analysis of habitat selection by Stone's sheep, which show strong fidelity to seasonal ranges but also exhibit behavioural plasticity in selection of attributes within those ranges.Nomenclature: Hultéén, 1974; Nowak & Paradiso, 1983.
    Language English
    Document type Article
    ISSN 1195-6860
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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