3,304 research outputs found

    Tantilla hobartsmithi

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    Number of Pages: 2Integrative BiologyGeological Science

    Stock Returns Versus Bond Returns: Actual Historical Data 1926-2008

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    Robert J. Angell, D.B.A., is professor of finance, Department of Economics & Finance, North Carolina Agricultural and Technology State University, Greensboro, NC 27411. Charles W. Cole, Ph.D., is assistant professor of finance, Department of Economics & Finance, North Carolina Agricultural and Technology State University, Greensboro, N

    An Asynchronous, Personalized Learning Platform―Guided Learning Pathways (GLP)

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    The authors propose that personalized learning can be brought to traditional and non-traditional learners through asynchronous learning platform that recommends to individual learners the learning materials best suited for him or her. Such a platform would allow learners to advance towards individual learning goals at their own pace, with learning materials catered to each learner’s interests and motivations. This paper describes the authors’ vision and design for a modular, personalized learning platform called Guided Learning Pathways (GLP), and its characteristics and features. We provide detailed descriptions of and propose frameworks for critical modules like the Content Map, Learning Nuggets, and Recommendation Algorithms. A threaded user scenario is provided for each module to help the reader visualize different aspects of GLP. We discuss work done at MIT to support such a platform

    Fence lizards

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    13 p. : ill. ; 26 cm.Includes bibliographical references (p. 12-13)."The eastern fence lizard (S. undulatus) and western fence lizard (S. occidentalis) are shown to be sympatric in a woodland community in the Pine Valley Mountains, Washington County, Utah. Observations on external morphology and chromosomes, involving 49 specimens from the area of sympatry, produced no evidence of interbreeding. These forms are properly regarded as different species. The 16 S. occidentalis karyotyped from the Pine Valley Mountains included a triploid female that was sterile but otherwise appeared normal. Specimens of S. occidentalis have been karyotyped from many localities throughout its range (Utah to California, Washington to Baja California Norte), and, normally, all individuals are alike in chromosome morphology. However, four specimens out of 12 from northwestern California (Del Norte, Trinity, and Shasta counties) had a heteromorphic pair of chromosomes that were not sex-correlated. Following a generally overlooked paper by Harper, the authorship of the name Stellio undulatus (= Sceloporus undulatus) should be credited to Bosc and Daudin (in Sonnini and Latreille, 1801)"--P. [1]

    Karyotypes and systematics of the lizards in the variabilis, jalapae, and scalaris species groups of the genus Sceloporus. American Museum novitates ; no. 2653

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    13 p. : ill. ; 26 cm.Includes bibliographical references (p. 12-13)."Karyotypes of 11 species of Sceloporus are described and illustrated. Lizards included are all species of the variabilis group as recognized by Smith (1939), all species of the jalapae and scalaris groups as recognized by Thomas and Dixon (1976), and Sceloporus siniferus of the siniferus group (for comparisons). The lizards examined include four of the seven species placed in the genus Lysoptychus by Larsen and Tanner (1975), karyotypes of the other three species of which I described earlier. Data from karyotypes and other morphological characteristics suggest the following: (1) Lysoptychus is a junior synonym of Sceloporus; (2) the variabilis group is distinctive; (3) S. teapensis is not specifically distinct from S. variabilis; (4) the variabilis group includes S. variabilis, S. chrysostictus, S. couchii, S. cozumelae, and S. parvus; (5) the species in the jalapae group (S. jalapae, S. ochoterenae) are very similar to each other; and (6) the scalaris group (S. scalaris, S. aeneus, S. goldmani) is distinctive"--P. [1]

    Lizard karyotypes

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    17 p. : ill., ; 24 cm.Includes bibliographical references (p. 16-17)."The karyotypes of the five species of Sceloporus that comprise monotypic species groups are described on the basis of examination of chromosomes in approximately 340 cells from 28 lizards (19 males, 9 females), and the following broad conclusions are reached: (1) S. chrysostictus (2n = 34) has karyotypes (including an X-Y sex chromosome system) virtually identical to those of species in the variabilis group and unlike those of other species in the genus, which indicates that its affinities lie with that group. (2) S. graciosus (2n = 30) has a karyotype distinctly different from that of all other species analyzed in the genus, which is compatible with its comprising a monotypic group. (3) S. maculosus (2n = 33 in males; 2n = 34 in females) has distinctive karyotypes (including an X[subscript]1X[subscript]2Y(male):X[subscript]1X[subscript]1X[subscript]2X[subscript]2(female) sex chromosome system) that are different from those of all other species analyzed in the genus, which is consistent with its comprising a monotypic group. (4) S. merriami (2n = 46) has the highest chromosome number shown in the genus and also has distinctive karyotypes (including an X-Y sex chromosome system) that are different from those of all other species analyzed in the genus. (5) S. utiformis (2n = 34) has karyotypes (also including an X-Y sex chromosome system) virtually identical to those of species in the siniferus group, which, together with features of external morphology, indicates that its affinities lie with that group"--P. 14-15

    The yeast integral membrane protein Apq12 potentially links membrane dynamics to assembly of nuclear pore complexes

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    Although the structure and function of components of the nuclear pore complex (NPC) have been the focus of many studies, relatively little is known about NPC biogenesis. In this study, we report that Apq12 is required for efficient NPC biogenesis in Saccharomyces cerevisiae. Apq12 is an integral membrane protein of the nuclear envelope (NE) and endoplasmic reticulum. Cells lacking Apq12 are cold sensitive for growth, and a subset of their nucleoporins (Nups), those that are primarily components of the cytoplasmic fibrils of the NPC, mislocalize to the cytoplasm. APQ12 deletion also causes defects in NE morphology. In the absence of Apq12, most NPCs appear to be associated with the inner but not the outer nuclear membrane. Low levels of benzyl alcohol, which increases membrane fluidity, prevented Nup mislocalization and restored the proper localization of Nups that had accumulated in cytoplasmic foci upon a shift to lower temperature. Thus, Apq12p connects nuclear pore biogenesis to the dynamics of the NE

    Survey of Wholesale and Retail Buyers in the Six Southern States of the North Central Region

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    Technology has improved production of aquaculture products and reduced unit costs such that reasonably dependable supplies of fish and seafood are available to the markets. This study describes current distribution channels at the wholesale and retail levels for farm-raised and wild-caught species in the North Central Region (NCR), and evaluates both buyer attitudes towards farm-raised products and interest in specific species. Suppliers of fish and seafood products are experiencing a growth in consumer demand. United States per capita consumption of edible fish and seafood increased from 12.8 pounds in 1980 to 15.9 pounds in 1989, and is expected to reach more than 20 pounds per capita by the year 2000 (U.S. Department of Commerce 1990). This is attributed to increased average income, changing consumer demographics, and the present wave of health consciousness (Blaylock et al. 1987). As “Baby Boomers” approach middle age and the number of senior citizens increase, the health benefits derived from eating fish are becoming important issues
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