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  • 1
    Call number: MOP 5119/1
    In: Mémoires de l'Observatoire de l'Ebre sis à Roquetas dépedant du Collège d'Etudes Supérieures de la Compie de Jésus, Tortosa
    Type of Medium: Monograph available for loan
    Pages: 59 S.
    Edition: éd. francaise
    Series Statement: Mémoires de l'Observatoire de l'Ebre sis à Roquetas dépedant du Collège d'Etudes Supérieures de la Compie de Jésus, Tortosa 1
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mammalian genome 11 (2000), S. 689-693 
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. During recent years, there has been an exponential rise in the number of sequences accessible in the public databases. Despite this, a high percentage of partial sequences of cDNA (ESTs) submitted to the databases remain unrecognized (anonymous ESTs). This lack of similarities could be explained by several hypotheses: i) a different part of the transcript is present in the GenBank; ii) the transcript represents a novel gene not yet isolated in other species; iii) alternative splicing of the same gene in different species; iv) inaccurate sequence data; and/or v) the sequence of the transcript has diverged to the extent that it is not recognized as an ortholog. In the present study we selected a sample of 20 ESTs from a pool of 656 anonymous pig small intestine ESTs in order to investigate the possible cause for the lack of similarities with database entries. To test the significant hypotheses we carried out total sequencing of each insert along with zoo-blot and Northern-blot analysis. Extended analyses of the 20 ESTs showed significant matches to seven existing database entries, whereas 13 still did not show significant hits. The results are discussed in the context of the hypothesis listed above.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the influence of Nb doping on the TiO2 anatase-to-rutile phase transition, using combined transmission electron microscopy, Raman spectroscopy, x-ray diffraction and selected area electron diffraction analysis. This approach enabled anatase-to-rutile phase transition hindering to be clearly observed for low Nb-doped TiO2 samples. Moreover, there was clear grain growth inhibition in the samples containing Nb. The use of high resolution transmission electron microscopy with our samples provides an innovative perspective compared with previous research on this issue. Our analysis shows that niobium is segregated from the anatase structure before and during the phase transformation, leading to the formation of NbO nanoclusters on the surface of the TiO2 rutile nanoparticles. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2018-11-06
    Description: This paper explores the link between exports and total factor productivity (TFP) in Brazilian manufacturing firms over the period 2000-2008. The Brazilian experience is instructive as it is a case of an economy that expanded aggregate exports significantly, but with stagnant aggregate TFP growth. The authors first estimate firm-level TFP under alternative assumptions (exogenous and endogenous law of motion for productivity) following Wooldridge's (On estimating firm-level production functions using proxy variables to control for unobservables, 2009) GMM procedure. In turn, they use stochastic dominance techniques to assess whether the ex-ante most productive firms are those that start exporting (self-selection hypothesis). Finally, they test whether exporting boosts firms TFP growth (learning-by-exporting hypothesis) using matching techniques, to control for the possibility that selection into exports may not be a random process. Their results confirm the self-selection hypothesis and show that starting to export yields an extra TFP growth that emerges since a firm's first year of exporting but lasts only one year. Further, this extra TFP growth is much higher under the assumption of an endogenous law of motion for productivity, which reinforces the importance of accounting for firm export status to study the evolution of productivity.
    Keywords: D24 ; F14 ; O54 ; ddc:330 ; TFP ; export status ; exogenous vs. endogenous Markov ; semi-parametric approach ; self-selection ; stochastic dominance ; learning-by-exporting ; matching techniques
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:article
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  • 5
    Publication Date: 2015-04-22
    Description: This paper explores the link between exports and total factor productivity (TFP) for Brazilian manufacturing firms over the period 2000-2008, both under the assumption of an exogenous or an endogenous law of motion for productivity. The authors first obtain TFP estimates under each alternative assumption following Wooldridge (On estimating firm-level production functions using proxy variables to control for unobservables, 2009) GMM procedure. Second, using stochastic dominance techniques they analyse whether the ex-ante most productive firms are those that start exporting (self-selection hypothesis). Finally, the authors test whether exporting boosts firms TFP growth (learning-by-exporting hypothesis) using matching techniques, to control for the possibility that selection into exports may not be a random process. Their results confirm the self-selection hypothesis and show that starting to export yields firms an extra TFP growth that emerges since the first year exporting but lasts only from this year to the next. Further, this extra TFP growth is much higher under the assumption of an endogenous law of motion for productivity, which reinforces the importance of accounting for firm export status to study the evolution of productivity.
    Keywords: F14 ; D24 ; C14 ; C33 ; C36 ; ddc:330 ; TFP ; export status ; exogenous vs. endogenous Markov ; semi-parametric approach ; self-selection ; stochastic dominance ; learning-by exporting ; matching techniques
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 6
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Semispherical palladium nanoclusters have been epitaxed on {110} facets of tin dioxide nanosticks. The synthesis of tin dioxide nanoparticles has been optimized to obtain a crystallite shape with a maximum surface area lying on the rutile structure {110} planes, which are the most active for gas sensing. For this purpose, we describe a microwave method, which allowed us to obtain monocrystalline stick-like tin dioxide nanoparticles (so-called nanosticks) with rectangular prism shape. These nanosticks present long lateral {110} faces, squared cross-section 5–25 nm wide, and lengths of up to 0.5 μm. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2013-11-19
    Description: Background: RNA extraction is a crucial step for monitoring gene expression. Poor RNA quality (including degradation and remaining impurities) can result in misleading results. Isolation of RNA from animal tissues with high lipid content can be challenging. Especially, it is not trivial to isolate high quality RNA with a reasonable yield from adipose tissue. The aim of this study was to provide an optimized protocol for isolating total RNA from adipose tissue. This was achieved by combining the advantages of the two routinely used methods, TRI Reagent(R) and miRNeasy.FindingsThe miRNeasy method results in cleaner samples but more prone to degradation while the TRI Reagent(R) method results in samples contaminated with salts and solvents but more intact. The new protocol combines the best of both methods resulting in RNA of high quality and suitable for downstream experiments like RT-qPCR, microarrays and high-throughput sequencing. Conclusions: The current protocol for total RNA isolation from adipose tissue yields sufficient amount of high quality total RNA free of contaminants.
    Electronic ISSN: 1756-0500
    Topics: Biology , Medicine
    Published by BioMed Central
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  • 8
    Publication Date: 2015-05-05
    Description: The role of different charge transport mechanisms in Si / Si O 2 structures has been studied. A theoretical model based on the Transfer Hamiltonian Formalism has been developed to explain experimental current trends in terms of three different elastic tunneling processes: (1) trap assisted tunneling; (2) transport through an intermediate quantum dot; and (3) direct tunneling between leads. In general, at low fields carrier transport is dominated by the quantum dots whereas, for moderate and high fields, transport through deep traps inherent to the SiO 2 is the most relevant process. Besides, current trends in Si / Si O 2 superlattice structure have been properly reproduced.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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  • 9
    Publication Date: 2011-06-01
    Description: Cellular imbalances of cholesterol and fatty acid metabolism result in pathological processes, including atherosclerosis and metabolic syndrome. Recent work from our group and others has shown that the intronic microRNAs hsa-miR-33a and hsa-miR-33b are located within the sterol regulatory element-binding protein-2 and -1 genes, respectively, and regulate cholesterol homeostasis in concert with their host genes. Here, we show that miR-33a and -b also regulate genes involved in fatty acid metabolism and insulin signaling. miR-33a and -b target key enzymes involved in the regulation of fatty acid oxidation, including carnitine O-octaniltransferase, carnitine palmitoyltransferase 1A, hydroxyacyl-CoA-dehydrogenase, Sirtuin 6 (SIRT6), and AMP kinase subunit-α. Moreover, miR-33a and -b also target the insulin receptor substrate 2, an essential component of the insulin-signaling pathway in the liver. Overexpression of miR-33a and -b reduces both fatty acid oxidation and insulin signaling in hepatic cell lines, whereas inhibition of endogenous miR-33a and -b increases these two metabolic pathways. Together, these data establish that miR-33a and -b regulate pathways controlling three of the risk factors of metabolic syndrome, namely levels of HDL, triglycerides, and insulin signaling, and suggest that inhibitors of miR-33a and -b may be useful in the treatment of this growing health concern.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
    Publication Date: 2016-03-13
    Description: Article Surface-mediated synthesis of low-dimensional polymers is a promising approach to design materials for targeted applications. Here, the authors introduce surface-confined thermally tunable pathways to select intra- or intermolecular reactions yielding monomeric or lowdimensional polymeric phthalocyanines. Nature Communications doi: 10.1038/ncomms11002 Authors: Borja Cirera, Nelson Giménez-Agulló, Jonas Björk, Francisco Martínez-Peña, Alberto Martin-Jimenez, Jonathan Rodriguez-Fernandez, Ana M. Pizarro, Roberto Otero, José M. Gallego, Pablo Ballester, José R. Galan-Mascaros, David Ecija
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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