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  • 2000-2004  (366)
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  • 1
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    Soil Organic Carbon Content in Frigid Southern Appalachian Mountain Soils (2004)
    Wiley
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 2
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    Soil Organic Carbon Content in Frigid Southern Appalachian Mountain Soils (2004)
    Wiley
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 3
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    Generation of Aluminum Nanoparticles Using an Atmospheric Pressure Plasma Torch (2004)
    American Chemical Society
    Details
    Publication Date: 2004-12-01
    Print ISSN: 1520-6106
    Electronic ISSN: 1520-5207
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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  • 4
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    Alignment of liquid crystals with patterned isotropic surfaces (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-03
    Description: The molecules of a nematic liquid crystal exposed to an isotropic surface adopt a mean tilt relative to the normal but have no in-plane alignment-that is, they are free to have any azimuthal orientation in the surface plane. Pursuing the theoretical suggestion by Meyer that, in spite of this azimuthal degeneracy, spatially inhomogeneous isotropic surfaces combine with liquid crystal elastic anisotropy to produce alignment, we show that a boundary line between two isotropic regions that differ in mean tilt does indeed align the liquid crystal. The boundaries on a patterned surface of distinct isotropic regions thus act as a system of lines that the molecular orientation locally follows. This enables the development of liquid crystal alignment surfaces based on printing or lithographic patterning.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee , B W -- Clark, N A -- New York, N.Y. -- Science. 2001 Mar 30;291(5513):2576-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Ferroelectric Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309-0390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11283364" target="_blank"〉PubMed〈/a〉
    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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  • 5
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    Ultrathin single-crystalline silver nanowire arrays formed in an ambient solution phase (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-08
    Description: We report the synthesis of single-crystalline silver nanowires of atomic dimensions. The ultrathin silver wires with 0.4 nanometer width grow up to micrometer-scale length inside the pores of self-assembled calix[4]hydroquinone nanotubes by electro-/photochemical redox reaction in an ambient aqueous phase. The present subnanowires are very stable under ambient air and aqueous environments, unlike previously reported metal wires of approximately 1 nanometer diameter, which existed only transiently in ultrahigh vacuum. The wires exist as coherently oriented three-dimensional arrays of ultrahigh density and thus could be used as model systems for investigating one-dimensional phenomena and as nanoconnectors for designing nanoelectronic devices.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hong, B H -- Bae, S C -- Lee, C W -- Jeong, S -- Kim, K S -- New York, N.Y. -- Science. 2001 Oct 12;294(5541):348-51. Epub 2001 Sep 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Creative Research Initiative Center for Superfunctional Materials, Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Hyojadong, Namgu, Pohang 790-784, Korea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11546837" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Ordering of quantum dots using genetically engineered viruses (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-05-04
    Description: A liquid crystal system was used for the fabrication of a highly ordered composite material from genetically engineered M13 bacteriophage and zinc sulfide (ZnS) nanocrystals. The bacteriophage, which formed the basis of the self-ordering system, were selected to have a specific recognition moiety for ZnS crystal surfaces. The bacteriophage were coupled with ZnS solution precursors and spontaneously evolved a self-supporting hybrid film material that was ordered at the nanoscale and at the micrometer scale into approximately 72-micrometer domains, which were continuous over a centimeter length scale. In addition, suspensions were prepared in which the lyotropic liquid crystalline phase behavior of the hybrid material was controlled by solvent concentration and by the use of a magnetic field.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Seung-Wuk -- Mao, Chuanbin -- Flynn, Christine E -- Belcher, Angela M -- New York, N.Y. -- Science. 2002 May 3;296(5569):892-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry, Center for Nano- and Molecular Science and Technology, Texas Materials Institute, Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11988570" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacteriophage M13/chemistry/genetics/ultrastructure ; Capsid/*chemistry/genetics/metabolism ; *Capsid Proteins ; Cloning, Molecular ; Crystallization ; *Genetic Engineering ; Membrane Proteins/*chemistry/genetics/metabolism ; Micelles ; Microscopy, Atomic Force ; Microscopy, Electron ; Microscopy, Electron, Scanning ; *Nanotechnology ; Oligopeptides/*chemistry/metabolism ; Particle Size ; Peptide Library ; Polymers/*chemistry ; Sulfides/*chemistry/metabolism ; Zinc Compounds/*chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Role of T-bet in commitment of TH1 cells before IL-12-dependent selection (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-09
    Description: How cytokines control differentiation of helper T (TH) cells is controversial. We show that T-bet, without apparent assistance from interleukin 12 (IL-12)/STAT4, specifies TH1 effector fate by targeting chromatin remodeling to individual interferon-gamma (IFN-gamma) alleles and by inducing IL-12 receptor beta2 expression. Subsequently, it appears that IL-12/STAT4 serves two essential functions in the development of TH1 cells: as growth signal, inducing survival and cell division; and as trans-activator, prolonging IFN-gamma synthesis through a genetic interaction with the coactivator, CREB-binding protein. These results suggest that a cytokine does not simply induce TH fate choice but instead may act as an essential secondary stimulus that mediates selective survival of a lineage.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mullen, A C -- High, F A -- Hutchins, A S -- Lee, H W -- Villarino, A V -- Livingston, D M -- Kung, A L -- Cereb, N -- Yao, T P -- Yang, S Y -- Reiner, S L -- AI-42370/AI/NIAID NIH HHS/ -- EY-07131/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 8;292(5523):1907-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Abramson Family Cancer Research Institute and Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6160, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11397944" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; CREB-Binding Protein ; Cell Differentiation ; Cell Division ; Cell Lineage ; Cells, Cultured ; DNA-Binding Proteins/metabolism ; Gene Expression Regulation ; Histones/metabolism ; Interferon-gamma/*biosynthesis/genetics ; Interleukin-12/*metabolism ; Lymphocyte Activation ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Nuclear Proteins/metabolism ; RNA, Messenger/genetics/metabolism ; Receptors, Interleukin/metabolism ; Receptors, Interleukin-12 ; STAT4 Transcription Factor ; Signal Transduction ; T-Box Domain Proteins ; Th1 Cells/cytology/*immunology/metabolism ; Trans-Activators/metabolism ; Transcription Factors/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    An aligned stream of low-metallicity clusters in the halo of the Milky Way (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-07-27
    Description: One of the long-standing problems in modern astronomy is the curious division of Galactic globular clusters, the "Oosterhoff dichotomy," according to the properties of their RR Lyrae stars. Here, we find that most of the lowest metallicity ([Fe/H] 〈 -2.0) clusters, which are essential to an understanding of this phenomenon, display a planar alignment in the outer halo. This alignment, combined with evidence from kinematics and stellar population, indicates a captured origin from a satellite galaxy. We show that, together with the horizontal-branch evolutionary effect, the factor producing the dichotomy could be a small time gap between the cluster-formation epochs in the Milky Way and the satellite. The results oppose the traditional view that the metal-poorest clusters represent the indigenous and oldest population of the Galaxy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yoon, Suk-Jin -- Lee, Young-Wook -- New York, N.Y. -- Science. 2002 Jul 26;297(5581):578-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Space Astrophysics, Yonsei University, Seoul 120-749, Korea. sjyoon@csa.yonsei.ac.kr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12142530" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    A subclass of Ras proteins that regulate the degradation of IkappaB (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-02-05
    Description: Small guanosine triphosphatases, typified by the mammalian Ras proteins, play major roles in the regulation of numerous cellular pathways. A subclass of evolutionarily conserved Ras-like proteins was identified, members of which differ from other Ras proteins in containing amino acids at positions 12 and 61 that are similar to those present in the oncogenic forms of Ras. These proteins, kappaB-Ras1 and kappaB-Ras2, interact with the PEST domains of IkappaBalpha and IkappaBbeta [inhibitors of the transcription factor nuclear factor kappa B (NF-kappaB)] and decrease their rate of degradation. In cells, kappaB-Ras proteins are associated only with NF-kappaB:IkappaBbeta complexes and therefore may provide an explanation for the slower rate of degradation of IkappaBbeta compared with IkappaBalpha.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fenwick, C -- Na, S Y -- Voll, R E -- Zhong, H -- Im, S Y -- Lee, J W -- Ghosh, S -- New York, N.Y. -- Science. 2000 Feb 4;287(5454):869-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Immunobiology and Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10657303" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Binding Sites ; Cell Line ; Guanosine Triphosphate/metabolism ; Humans ; I-kappa B Proteins/*metabolism ; Mice ; Molecular Sequence Data ; NF-kappa B/metabolism ; Phosphorylation ; Recombinant Fusion Proteins/chemistry/metabolism ; Signal Transduction ; Transcription Factor RelA ; Transfection ; Tumor Necrosis Factor-alpha/metabolism/pharmacology ; Two-Hybrid System Techniques ; ras Proteins/chemistry/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Hematopoietic cell regulation by Rac1 and Rac2 guanosine triphosphatases (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-10-18
    Description: The Rho guanosine triphosphatases (GTPases) Rac1 and Rac2 are critical signaling regulators in mammalian cells. The deletion of both Rac1 and Rac2 murine alleles leads to a massive egress of hematopoietic stem/progenitor cells (HSC/Ps) into the blood from the marrow, whereas Rac1-/- but not Rac2-/- HSC/Ps fail to engraft in the bone marrow of irradiated recipient mice. In contrast, Rac2, but not Rac1, regulates superoxide production and directed migration in neutrophils, and in each cell type, the two GTPases play distinct roles in actin organization, cell survival, and proliferation. Thus, Rac1 and Rac2 regulate unique aspects of hematopoietic development and function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gu, Yi -- Filippi, Marie-Dominique -- Cancelas, Jose A -- Siefring, Jamie E -- Williams, Emily P -- Jasti, Aparna C -- Harris, Chad E -- Lee, Andrew W -- Prabhakar, Rethinasamy -- Atkinson, Simon J -- Kwiatkowski, David J -- Williams, David A -- DK62757/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2003 Oct 17;302(5644):445-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Experimental Hematology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14564009" target="_blank"〉PubMed〈/a〉
    Keywords: Actins/metabolism ; Animals ; Apoptosis ; Bone Marrow Transplantation ; Cell Adhesion ; Cell Cycle ; Cell Movement ; Cell Size ; Colony-Forming Units Assay ; Cyclin D1/metabolism ; Fibronectins/metabolism ; Hematopoiesis ; Hematopoietic Stem Cell Mobilization ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells/*physiology ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Mitogen-Activated Protein Kinases/metabolism ; Neutrophils/*physiology ; *Protein-Serine-Threonine Kinases ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-akt ; Recombination, Genetic ; Signal Transduction ; Stem Cell Factor/pharmacology ; Superoxides/metabolism ; rac GTP-Binding Proteins/genetics/*metabolism ; rac1 GTP-Binding Protein/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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