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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 203 (1988), S. 246 
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Global change biology 6 (2000), S. 0 
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Leaf phenology describes the seasonal cycle of leaf functioning. Although it is essential for understanding the interactions between the biosphere, the climate, and biogeochemical cycles, it has received little attention in the modelling community at global scale. This article focuses on the prediction of spatial patterns of the climatological onset date of leaf growth for the decade 1983–93. It examines the possibility of extrapolating existing local models of leaf onset date to the global scale. Climate is the main variable that controls leaf phenology for a given biome at this scale, and satellite observations provide a unique means to study the seasonal cycle of canopies. We combine leaf onset dates retrieved from NOAA/AVHRR satellite NDVI with climate data and the DISCover land-cover map to identify appropriate models, and determine their new parameters at a 0.5° spatial resolution. We define two main regions: at temperate and high latitudes leaf onset models are mainly dependent on temperature; at low latitudes they are controlled by water availability. Some local leaf onset models are no longer relevant at the global scale making their calibration impossible. Nevertheless, we define our unified model by retaining the model that best reproduced the spatial distribution of leaf onset dates for each biome. The main spatial patterns of leaf onset date are well simulated, such as the Sahelian gradient due to aridity and the high latitude gradient due to frost. At temperate and high latitudes, simulated onset dates are in good agreement with climatological observations; 62% of treated grid-cells have a simulated leaf onset date within 10 days of the satellite observed onset date (which is also the temporal resolution of the NDVI data). In tropical areas, the subgrid heterogeneity of the phenology is larger and our model's predictive power is diminished. The difficulties encountered in the tropics are due to the ambiguity of the satellite signal interpretation and the low reliability of rainfall and soil moisture fields.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 407-419 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigations into the determination of the influence of functional groups in N-containing inhibitors on the corrosion protection efficiency91 compounds, primarily from the class of benzimidazoles, were synthesized as model substances for establishing relationships between molecular structure and inhibitors efficiency.Gravimetric and electrochemical tests as well as surface analysis were used to determine the influence of various functional groups on the inhibition of corrosion according to the type and position of these groups in the N-containing heterocycles. The analyses were performed in 1 mole NaClO4 and in drinking water with unalloyed steel, oxygen-free copper and aluminium 99.5 as the test materials.The gravimetric tests show the type and length of the side chain, substituents at the nucleus and the functional group have an appreciable influence on the inhibition of corrosion. The electrochemical measurements show that the model substances can be divided into two groups according to their inhibitive effect: the anodically active ones (containing phosphono groups) and the cathodically active ones.The surface analysis tests using ESCA show, for example, that with the 2-aminopentyl benzimidazole, monomolecular adsorbates up to three atom layers thick are deposited on oxygen-free copper.
    Notes: 91 Verbindungen, überwiegend aus der Reihe der Benzimidazole, wurden als Modellsubstanzen zur Auffindung von Struktur-Wirkbeziehungen synthetisiert.Mittels gravimetrischer, elektrochemischer und oberflächen-analytischer Untersuchungen wurde der Einfluß verschiedener funktioneller Gruppen nach Art und Stellung in den N-haltigen Heterocyclen auf die Korrosionsinhibierung bestimmt. Die Untersuchungen wurden in 1 mol NaClO4 und Trinkwasser an unlegiertem Stahl, an SF-Kupfer und Aluminium 99,5 durchgeführt.Die gravimetrischen Untersuchungen zeigen, daß Art und Länge der Seitenkette, die Art des Substituenten am Kern sowie die funktionelle Gruppe die Korrosionsinhibierung deutlich beeinflussen. Die elektrochemischen Messungen zeigen, daß sich die Modellsubstanzen hinsichtlich ihrer Inhibierungswirkung in zwei Gruppen, nämlich anodisch wirksame (phosphonohaltige) und kathodisch wirksame (phosphonofreie) einteilen lassen.Die oberflächenanalytischen Untersuchungen mittels ESCA belegen, daß sich z.B. beim 2-Aminopentyl-benzimidazol monomolekulare bis zu drei Atomlagen dicke Adsorbate auf SF-Kupfer abscheiden.
    Additional Material: 29 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1669-1677 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The glass transition temperature is analyzed in polyamide systems characterized, owing to their chemical composition, by the absence of hydrogen bonds. The physical behavior exhibited by these systems is similar to that observed in conventional aliphatic polyamides, suggesting that, besides the hydrogen bonds, the amidic group itself plays a specific and important role in determining the polymer physical behavior generally and, in particular, the glass transition mechanism. It is surmised that this role is connected with the polar and rigid character of the amidic group, affecting chain-chain interactions and chain mobility.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 2145-2148 
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 72 (1960), S. 751-752 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
  • 8
    Publication Date: 2014-05-15
    Description: P-glycoprotein (Pgp) is a prototype ATP binding cassette transporter involved in multidrug resistance of cancer. We used directed evolution to replace six cytoplasmic cysteine (Cys) residues in Pgp with all twenty standard amino acids and selected for active mutants. From a pool of 75,000 transformants for each block of three Cys, we identified multiple mutants that preserved drug resistance and yeast mating activity. The most frequent substitutions were glycine and serine for C427 (24% and 20%, respectively) and C1070 (37% and 25%) of the Walker A motifs in the nucleotide binding domains (NBDs), C1223 in NBD2 (25% and 8%), and C638 in the linker region (24% and 16%), whereas close-by C669 tolerated glycine (16%) and alanine (14%), but not serine (absent). C1121 in NBD2 showed a clear preference for positively charged arginine (38%) suggesting a salt bridge with E269 in the intracellular loop ICL2 may stabilize domain interactions. In contrast, three Cys residues in transmembrane α-helices could be successfully replaced by alanine. The resulting Cys-less Pgp was fully active in yeast cells, and purified proteins displayed drug-stimulated ATPase activities indistinguishable from wild-type Pgp. Overall, directed evolution identified site-specific, non-conservative Cys substitutions that allowed building of a robust Cys-less Pgp, an invaluable new tool for future functional and structural studies, and that may guide the construction of other cysteine-less proteins where alanine and serine have proven unsuccessful.
    Print ISSN: 0144-8463
    Electronic ISSN: 1573-4935
    Topics: Biology , Chemistry and Pharmacology
    Published by Portland Press
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  • 9
    Publication Date: 2013-08-16
    Description: MBNL142 and MBNL143 gene isoforms, overexpressed in DM1-patient muscle, encode for nuclear proteins interacting with Src family kinases Cell Death and Disease 4, e770 (August 2013). doi:10.1038/cddis.2013.291 Authors: A Botta, A Malena, E Tibaldi, L Rocchi, E Loro, E Pena, L Cenci, E Ambrosi, M C Bellocchi, M A Pagano, G Novelli, G Rossi, H L Monaco, E Gianazza, B Pantic, V Romeo, O Marin, A M Brunati & L Vergani
    Keywords: MBNL1DM1SFKsmuscle
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 10
    Publication Date: 2008-03-01
    Print ISSN: 1383-5742
    Electronic ISSN: 1388-2139
    Topics: Biology , Medicine
    Published by Elsevier
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