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  • Articles  (42)
  • Polymer and Materials Science  (22)
  • Life and Medical Sciences  (7)
  • Humans  (5)
  • 550 - Earth sciences  (4)
  • Artemisia tridentata  (4)
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  • Articles  (42)
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  • 1
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    Alpha-synuclein blocks ER-Golgi traffic and Rab1 rescues neuron loss in Parkinson's models (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-24
    Description: Alpha-synuclein (alphaSyn) misfolding is associated with several devastating neurodegenerative disorders, including Parkinson's disease (PD). In yeast cells and in neurons alphaSyn accumulation is cytotoxic, but little is known about its normal function or pathobiology. The earliest defect following alphaSyn expression in yeast was a block in endoplasmic reticulum (ER)-to-Golgi vesicular trafficking. In a genomewide screen, the largest class of toxicity modifiers were proteins functioning at this same step, including the Rab guanosine triphosphatase Ypt1p, which associated with cytoplasmic alphaSyn inclusions. Elevated expression of Rab1, the mammalian YPT1 homolog, protected against alphaSyn-induced dopaminergic neuron loss in animal models of PD. Thus, synucleinopathies may result from disruptions in basic cellular functions that interface with the unique biology of particular neurons to make them especially vulnerable.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1983366/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1983366/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cooper, Antony A -- Gitler, Aaron D -- Cashikar, Anil -- Haynes, Cole M -- Hill, Kathryn J -- Bhullar, Bhupinder -- Liu, Kangning -- Xu, Kexiang -- Strathearn, Katherine E -- Liu, Fang -- Cao, Songsong -- Caldwell, Kim A -- Caldwell, Guy A -- Marsischky, Gerald -- Kolodner, Richard D -- Labaer, Joshua -- Rochet, Jean-Christophe -- Bonini, Nancy M -- Lindquist, Susan -- P50 NS038372/NS/NINDS NIH HHS/ -- R01-HG002923/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2006 Jul 21;313(5785):324-8. Epub 2006 Jun 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16794039" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Caenorhabditis elegans ; Cell Survival ; Cells, Cultured ; Disease Models, Animal ; Dopamine/physiology ; Drosophila ; Endoplasmic Reticulum/*metabolism ; Gene Expression ; Gene Library ; Golgi Apparatus/*metabolism ; Humans ; Mice ; Nerve Degeneration ; Neurons/cytology/*physiology ; Parkinsonian Disorders/metabolism/pathology/*physiopathology ; Proteasome Endopeptidase Complex/metabolism ; Protein Folding ; *Protein Transport ; Proteins/chemistry/metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/genetics/metabolism ; Saccharomyces cerevisiae Proteins/genetics/metabolism ; alpha-Synuclein/chemistry/genetics/*metabolism ; rab GTP-Binding Proteins/genetics/metabolism ; rab1 GTP-Binding Proteins/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Functional links between Abeta toxicity, endocytic trafficking, and Alzheimer's disease risk factors in yeast (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-10-29
    Description: Abeta (beta-amyloid peptide) is an important contributor to Alzheimer's disease (AD). We modeled Abeta toxicity in yeast by directing the peptide to the secretory pathway. A genome-wide screen for toxicity modifiers identified the yeast homolog of phosphatidylinositol binding clathrin assembly protein (PICALM) and other endocytic factors connected to AD whose relationship to Abeta was previously unknown. The factors identified in yeast modified Abeta toxicity in glutamatergic neurons of Caenorhabditis elegans and in primary rat cortical neurons. In yeast, Abeta impaired the endocytic trafficking of a plasma membrane receptor, which was ameliorated by endocytic pathway factors identified in the yeast screen. Thus, links between Abeta, endocytosis, and human AD risk factors can be ascertained with yeast as a model system.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3281757/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3281757/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Treusch, Sebastian -- Hamamichi, Shusei -- Goodman, Jessica L -- Matlack, Kent E S -- Chung, Chee Yeun -- Baru, Valeriya -- Shulman, Joshua M -- Parrado, Antonio -- Bevis, Brooke J -- Valastyan, Julie S -- Han, Haesun -- Lindhagen-Persson, Malin -- Reiman, Eric M -- Evans, Denis A -- Bennett, David A -- Olofsson, Anders -- DeJager, Philip L -- Tanzi, Rudolph E -- Caldwell, Kim A -- Caldwell, Guy A -- Lindquist, Susan -- F32 NS067782-02/NS/NINDS NIH HHS/ -- K08 AG034290/AG/NIA NIH HHS/ -- K08AG034290/AG/NIA NIH HHS/ -- P30 AG019610/AG/NIA NIH HHS/ -- P30AG10161/AG/NIA NIH HHS/ -- R01 AG015819/AG/NIA NIH HHS/ -- R01 AG017917/AG/NIA NIH HHS/ -- R01AG15819/AG/NIA NIH HHS/ -- R01AG17917/AG/NIA NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Dec 2;334(6060):1241-5. doi: 10.1126/science.1213210. Epub 2011 Oct 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22033521" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*genetics/*metabolism ; Amyloid beta-Peptides/chemistry/genetics/*metabolism ; Animals ; Animals, Genetically Modified ; Caenorhabditis elegans/cytology/genetics/metabolism ; Cell Membrane/metabolism ; Cells, Cultured ; Clathrin/metabolism ; Cytoskeleton/metabolism ; Disease Susceptibility ; *Endocytosis ; Genetic Association Studies ; Genetic Testing ; Glutamates/metabolism ; Humans ; Monomeric Clathrin Assembly Proteins/genetics/metabolism ; Neurons/physiology ; Peptide Fragments/chemistry/genetics/*metabolism ; Protein Multimerization ; Protein Transport ; Rats ; Risk Factors ; *Saccharomyces cerevisiae/cytology/genetics/growth & development/metabolism ; Saccharomyces cerevisiae Proteins/genetics/metabolism ; Secretory Pathway
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    The Global Sea Level Observing System (GLOSS) (2010)
    In:  Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society, vol. 2 | ESA Publication WPP-306
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/bookPart
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  • 4
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    Modelling of strong 3-D effects in MT data from Namibia. (2000)
    In:  15th Workshop on Electromagnetic Induction in the Earth
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Controlled Source Imaging of the Kunlun Suture, Northeast Tebetan Plateau (2007)
    In:  AGU 2007 Fall Meeting (San Francisco 2007)
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 6
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    Controlled Source Imaging of the Kunlun Suture, Northeast Tibetan Plateau (2007)
    In:  EOS, Transactions, American Geophysical Union, Suppl. ; 88 (52)
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 7
    Electronic Resource
    Electronic Resource
    Species interactions at the level of fine roots in the field: influence of soil nutrient heterogeneity and plant size (1996)
    Springer
    Oecologia 106 (1996), S. 440-447 
    Details
    ISSN: 1432-1939
    Keywords: Artemisia tridentata ; Tussock grasses ; Competition ; Roots ; Soil heterogeneity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Interference at the level of fine roots in the field was studied by detailed examination of fine root distribution in small soil patches. To capture roots as they occur in natural three-dimensional soil space, we used a freezing and slicing technique for microscale root mapping. The location of individual roots intersecting a sliced soil core surface was digitized and the identity of shrub and grass roots was established by a chemical technique. Soil patches were created midway between the shrub, Artemisia tridentata, and one of two tussock grasses, Pseudoroegneria spicata or Agropyron desertorum. Some soil patches were enriched with nutrients and others given only deionized water (control); in addition, patches were located between plants of different size combination (large shrubs with small tussock grasses and small shrubs with large tussock grasses). The abundance of shrub and grass roots sharing soil patches and the inter-root distances of individual fine roots were measured. Total average rooting density in patches varied among these different treatment combinations by only a factor of 2, but the proportion of shrub and grass roots in the patches varied sixfold. For the shrub, the species of grass roots sharing the patches had a pronounced influence on shrub root density; shrub roots were more abundant if the patch was shared with Pseudoroegneria roots than if shared with Agropyron roots. The relative size of plants whose roots shared the soil patches also influenced the proportion of shrub and grass roots; larger plants were able to place more roots in the patches than were the smaller plants. In the nutrient-enriched patches, these influences of grass species and size combination were amplified. At the millimeter- to centimeter-scale within patches, shrub and grass roots tended to segregate, i.e., avoid each other, based on nearest-neighbor distances. At this scale, there was no indication that the species-specific interactions were the result of resource competition, since there were no obvious patterns between the proportion of shrub and grass roots of the two species combinations with microsite nutrient concentrations. Other potential mechanisms are discussed. Interference at the fine-root level, and its species-specific character, is likely an influential component of competitive success, but one that is not easily assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329699
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of competition on stable carbon isotope ratios of two tussock grass species (1991)
    Springer
    Oecologia 88 (1991), S. 148-151 
    Details
    ISSN: 1432-1939
    Keywords: Agropyron desertorum ; Agropyron spicatum ; Pseudoroegneria spicata ; Artemisia tridentata ; Stable carbon isotope composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Previous studies have shown that plant carbon isotope composition varies when plants experience differences in water and nutrient availability. However, none have addressed the effect of root interactions, including competition for these soil resources, on carbon isotope ratios. We studied the effect of interspecific root interactions on the productivity and carbon isotope ratios of two Great Basin tussock grass species (Agropyron desertorum and Pseudoroegneria spicata). We compared grasses grown in mixture with sagebrush (Artemisia tridentara) to grasses in similar mixtures but where root interactions with sagebrush were limited by fiberglass partitions. During both years of the study, tussocks growing in competition with sagebrush produced tissue with more negative δ13C values than grasses experiencing limited root interaction with sagebrush. The magnitude of this difference (0.5 to 0.9%) is similar to that found in other studies when soil fertility and moisture availability were altered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328416
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  • 9
    Electronic Resource
    Electronic Resource
    Soil solution phosphate, root uptake kinetics and nutrient acquisition: implications for a patchy soil environment (1992)
    Springer
    Oecologia 89 (1992), S. 305-309 
    Details
    ISSN: 1432-1939
    Keywords: Soil phosphate ; Root kinetics ; Root proliferation ; Agropyron desertorum ; Artemisia tridentata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The importance of increased root phosphate (P) uptake kinetics, root proliferation and local increases of soil solution P (P1) for P acquisition from fertile soil microsites was explored with a simulation model and calculated uptake was compared with experimental data. Based on the partitioning of added P in microsites to P1 and P adsorbed on soil particles and the results of a dual-isotope-labeling experiment (Caldwell et al. 1991a), acquisition of P from the fertile microsites was some 20 X that of uptake from an equal volume of soil which received only water. Simulations were in general agreement and also showed that elevation of root P uptake kinetics could contribute more to the increased acquisition than did root proliferation under these circumstances. Although increased physiological uptake capacity for P has generally been considered to be of little benefit because of diffusion limitation, in patchy soil environments selective elevation of P uptake kinetics in fertile microsites may be of considerable benefit. These tests were conducted in calcareous soil which releases much less P into the soil solution than do many other soils. In many noncalcareous soils the benefits of selective elevation of root uptake kinetics would likely be greater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317406
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  • 10
    Electronic Resource
    Electronic Resource
    Temporal dynamics of soil spatial heterogeneity in sagebrush-wheatgrass steppe during a growing season (1996)
    Springer
    Plant and soil 184 (1996), S. 299-309 
    Details
    ISSN: 1573-5036
    Keywords: Agropyron desertorum ; Artemisia tridentata ; nutrient availability ; resource patchiness ; sagebrush-grass steppe ; temporal variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Variability in five soil resources essential for plant growth (NH4 +, NO3 -, P, K and soil moisture) was quantified using univariate, multivariate and geostatistical techniques in a sagebrush-grass steppe ecosystem at three times (early April, June and August) during the 1994 growing season. Samples were collected every meter in a 10 × 10-m ‘macrogrid’, every 20 cm within nested 1 × 1-m ‘minigrids’, and every 3 cm within additionally nested 15 × 15-cm ‘microgrids’. Strong autocorrelation for all variables in the three sample periods was only found over distances less than 2 m, indicating that patches of high internal uniformity in this soil were smaller than 2 m during the growing season. Differences in semivariograms between sample periods were most pronounced for NO3 -, NH4 + and soil moisture, variables that we consider to primarily limit plant growth in this system. The distance over which sample points were autocorrelated for NO3 -, NH4 + and soil moisture increased from April to June. In contrast P and K, which are relatively more abundant at the study site, exhibited relatively constant semivariance patterns over the three sample periods. Weak correlation was found between samples collected in the three sample periods for N and soil moisture indicating that the spatial pattern of these limiting resources changed between sample periods. However, P and K had highly significant correlations (p〈0.00001) among sample periods, indicating that the distributional patterns of these relatively more abundant resources remained rather constant. There were strong negative correlations between P and K and distance from the base of shrubs for all sample times (p〈0.001), indicating an increase in P and K close to shrubs. Similar strong negative correlations were not found between distance from the shrubs and levels of NH4 +, NO3 -, or soil moisture, nor for any soil variable and distance from perennial tussock grasses. Changes in patterns of nutrient and soil moisture variability within a growing season suggest that not only must plants acquire soil resources that vary in time and space, but that they may also have to adjust to different scales of resource patchiness during the season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010459
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