ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Semiconductors I: bulk  (6)
  • *Climate Change  (2)
  • Biological Evolution  (2)
  • 1
    facet.materialart.
    Unbekannt
    Spectroscopic evidence for trap-dominated magnetic field effects in organic semiconductors (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-10-30
    Beschreibung: Author(s): M. Cox, M. H. A. Wijnen, G. A. H. Wetzelaer, M. Kemerink, P. W. M. Blom, and B. Koopmans Polaron traps are ubiquitous in organic semiconductors and recent evidence suggests they might be crucial for the large observed magnetic field effects (MFEs) in organic semiconductors. Here we measure MFEs in polymer thin-film devices with engineered, radiative trap sites in order to spectroscopica... [Phys. Rev. B 90, 155205] Published Wed Oct 29, 2014
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 2
    facet.materialart.
    Unbekannt
    ΔB mechanism for fringe-field organic magnetoresistance (2015)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2015-04-24
    Beschreibung: Author(s): M. Cox, S. P. Kersten, J. M. Veerhoek, P. Bobbert, and B. Koopmans Fringe fields emanating from magnetic domain structures can give rise to magnetoresistance in organic semiconductors. In this article, we explain these magnetic-field effects in terms of a ΔB mechanism. This mechanism describes how variations in magnetic-field strength between two polaron hopping si... [Phys. Rev. B 91, 165205] Published Thu Apr 23, 2015
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 3
    facet.materialart.
    Unbekannt
    Anisotropic magnetoconductance in polymer thin films (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-05-24
    Beschreibung: Author(s): M. Cox, F. Zhu, J. M. Veerhoek, and B. Koopmans Understanding the fundamental spin-spin interactions occurring in organic semiconductors is currently an open problem. The authors take a step closer to a possible solution with this detailed investigation of anisotropic magnetic field effects occurring in polymer thin films. [Phys. Rev. B 89, 195204] Published Fri May 23, 2014
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 4
    facet.materialart.
    Unbekannt
    Association of malaria parasite population structure, HLA, and immunological antagonism (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1998-03-21
    Beschreibung: Host-parasite coevolution has been likened to a molecular arms race, with particular parasite genes evolving to evade specific host defenses. Study of the variants of an antigenic epitope of Plasmodium falciparum that induces a cytotoxic T cell response supports this view. In African children with malaria, the variants present are influenced by the presence of a human leukocyte antigen (HLA) type that restricts the immune response to this epitope. The distribution of parasite variants may be further influenced by the ability of cohabiting parasite strains to facilitate each other's survival by down-regulating cellular immune responses, using altered peptide ligand antagonism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gilbert, S C -- Plebanski, M -- Gupta, S -- Morris, J -- Cox, M -- Aidoo, M -- Kwiatkowski, D -- Greenwood, B M -- Whittle, H C -- Hill, A V -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1998 Feb 20;279(5354):1173-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wellcome Trust Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Windmill Road, Oxford OX3 7BN, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9469800" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alleles ; Animals ; Antigens, Protozoan/genetics/*immunology ; Biological Evolution ; Child ; Epitopes ; Evolution, Molecular ; Gambia ; Genes, Protozoan ; Genetic Variation ; HLA-B35 Antigen/*immunology ; Humans ; Ligands ; Malaria, Falciparum/*immunology/parasitology ; Models, Biological ; Plasmodium falciparum/genetics/*immunology ; Protozoan Proteins/genetics/*immunology ; T-Lymphocytes, Cytotoxic/*immunology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 5
    facet.materialart.
    Unbekannt
    Cryptic sex-ratio bias provides indirect genetic benefits despite sexual conflict (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2010-03-06
    Beschreibung: When selection favors sexual dimorphism, high-fitness parents often produce low-fitness progeny of the opposite sex. This sexual conflict is thought to overwhelm the genetic benefits of mate choice because preferred males incur a cost through the production of low-fitness daughters. We provide a counterpoint in a lizard (Anolis sagrei) that exhibits sexual conflict over body size. By using mate-choice experiments, we show that female brown anoles produce more sons than daughters via large sires but more daughters than sons via small sires. Measures of progeny fitness in the wild suggest that maximal fitness payoffs can be achieved by shifting offspring production from daughters to sons as sire size increases. These results illustrate how the resolution of sexual conflict can restore the genetic benefits of mate choice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cox, Robert M -- Calsbeek, Ryan -- New York, N.Y. -- Science. 2010 Apr 2;328(5974):92-4. doi: 10.1126/science.1185550. Epub 2010 Mar 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA. robert.m.cox@dartmouth.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20203012" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biological Evolution ; Body Size ; Female ; *Genetic Fitness ; Lizards/anatomy & histology/*genetics/*physiology ; Male ; *Mating Preference, Animal ; Reproduction ; Selection, Genetic ; Sex Characteristics ; Sex Ratio ; Sexual Behavior, Animal
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 6
    facet.materialart.
    Unbekannt
    No increase in global temperature variability despite changing regional patterns (2013)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2013-07-26
    Beschreibung: Evidence from Greenland ice cores shows that year-to-year temperature variability was probably higher in some past cold periods, but there is considerable interest in determining whether global warming is increasing climate variability at present. This interest is motivated by an understanding that increased variability and resulting extreme weather conditions may be more difficult for society to adapt to than altered mean conditions. So far, however, in spite of suggestions of increased variability, there is considerable uncertainty as to whether it is occurring. Here we show that although fluctuations in annual temperature have indeed shown substantial geographical variation over the past few decades, the time-evolving standard deviation of globally averaged temperature anomalies has been stable. A feature of the changes has been a tendency for many regions of low variability to experience increases, which might contribute to the perception of increased climate volatility. The normalization of temperature anomalies creates the impression of larger relative overall increases, but our use of absolute values, which we argue is a more appropriate approach, reveals little change. Regionally, greater year-to-year changes recently occurred in much of North America and Europe. Many climate models predict that total variability will ultimately decrease under high greenhouse gas concentrations, possibly associated with reductions in sea-ice cover. Our findings contradict the view that a warming world will automatically be one of more overall climatic variation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huntingford, Chris -- Jones, Philip D -- Livina, Valerie N -- Lenton, Timothy M -- Cox, Peter M -- England -- Nature. 2013 Aug 15;500(7462):327-30. doi: 10.1038/nature12310. Epub 2013 Jul 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Ecology and Hydrology, Wallingford OX10 8BB, UK. chg@ceh.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23883935" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Climate Change ; *Computer Simulation ; Global Warming ; Ice Cover ; Seasons ; *Temperature
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 7
    facet.materialart.
    Unbekannt
    Sensitivity of tropical carbon to climate change constrained by carbon dioxide variability (2013)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2013-02-08
    Beschreibung: The release of carbon from tropical forests may exacerbate future climate change, but the magnitude of the effect in climate models remains uncertain. Coupled climate-carbon-cycle models generally agree that carbon storage on land will increase as a result of the simultaneous enhancement of plant photosynthesis and water use efficiency under higher atmospheric CO(2) concentrations, but will decrease owing to higher soil and plant respiration rates associated with warming temperatures. At present, the balance between these effects varies markedly among coupled climate-carbon-cycle models, leading to a range of 330 gigatonnes in the projected change in the amount of carbon stored on tropical land by 2100. Explanations for this large uncertainty include differences in the predicted change in rainfall in Amazonia and variations in the responses of alternative vegetation models to warming. Here we identify an emergent linear relationship, across an ensemble of models, between the sensitivity of tropical land carbon storage to warming and the sensitivity of the annual growth rate of atmospheric CO(2) to tropical temperature anomalies. Combined with contemporary observations of atmospheric CO(2) concentration and tropical temperature, this relationship provides a tight constraint on the sensitivity of tropical land carbon to climate change. We estimate that over tropical land from latitude 30 degrees north to 30 degrees south, warming alone will release 53 +/- 17 gigatonnes of carbon per kelvin. Compared with the unconstrained ensemble of climate-carbon-cycle projections, this indicates a much lower risk of Amazon forest dieback under CO(2)-induced climate change if CO(2) fertilization effects are as large as suggested by current models. Our study, however, also implies greater certainty that carbon will be lost from tropical land if warming arises from reductions in aerosols or increases in other greenhouse gases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cox, Peter M -- Pearson, David -- Booth, Ben B -- Friedlingstein, Pierre -- Huntingford, Chris -- Jones, Chris D -- Luke, Catherine M -- England -- Nature. 2013 Feb 21;494(7437):341-4. doi: 10.1038/nature11882. Epub 2013 Feb 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Engineering, Mathematics and Physical Science, University of Exeter, Exeter EX4 4QF, UK. p.m.cox@exeter.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23389447" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Carbon Cycle/*physiology ; Carbon Dioxide/analysis/*metabolism ; Cell Respiration ; *Climate Change ; *Models, Theoretical ; Photosynthesis ; Rain ; Temperature ; Trees/*metabolism ; *Tropical Climate ; Uncertainty
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 8
    facet.materialart.
    Unbekannt
    Traps and trions as origin of magnetoresistance in organic semiconductors (2013)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2013-07-03
    Beschreibung: Author(s): M. Cox, P. Janssen, F. Zhu, and B. Koopmans The large effect of a small magnetic field on the current, magnetoconductance (MC), in organic semiconductors—so-called organic magnetoresistance—has puzzled the field of organic spintronics during the last decade. Although the microscopic mechanisms regarding spin mixing are well understood by now,... [Phys. Rev. B 88, 035202] Published Tue Jul 02, 2013
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 9
    facet.materialart.
    Unbekannt
    Large magnetic field effects in electrochemically doped organic light-emitting diodes (2013)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2013-09-05
    Beschreibung: Author(s): S. van Reenen, S. P. Kersten, S. H. W. Wouters, M. Cox, P. Janssen, B. Koopmans, P. A. Bobbert, and M. Kemerink Large negative magnetoconductance (MC) of ∼12% is observed in electrochemically doped polymer light-emitting diodes at sub-band-gap bias voltages ( V bias ). Simultaneously, a positive magnetoefficiency (Mη) of 9% is observed at V bias = 2 V. At higher bias voltages, both the MC and Mη diminish while a ... [Phys. Rev. B 88, 125203] Published Wed Sep 04, 2013
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 10
    facet.materialart.
    Unbekannt
    Investigating the influence of traps on organic magnetoresistance by molecular doping (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-02-07
    Beschreibung: Author(s): M. Cox, E. H. M. van der Heijden, P. Janssen, and B. Koopmans Traps are localized, deep lying energetic states and are generally considered detrimental for organic semiconducting devices. In this work, we investigate their influence on the magnetic field sensitive current in organic devices, an effect often called organic magnetoresistance. Polymer thin films ... [Phys. Rev. B 89, 085201] Published Thu Feb 06, 2014
    Schlagwort(e): Semiconductors I: bulk
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...