ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Ultrasonic welding of thermoplastics in the near-field (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1689-1698 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Ultrasonic welding is one of the most popular techniques for joining thermoplastics because it is fast, economical, and easily automated. In near-field ultrasonic welding, the distance between the horn and the joint interface is 6 mm or less. This study investigated the near-field ultrasonic welding of amorphous (acrylonitrile-butadiene-styrene and polystyrene) and semicrystalline (polyethylene and polypropylene) polymers. High frequency ultrasonic wave propagation and attenuation measurements were made in order to estimate the dynamic mechanical moduli of the polymers. The estimated moduli were entered into a lumped parameter model in order to predict heating rates and energy dissipation. Experimental results showed that variations in the welding pressure had little effect on energy dissipation or joint strength; Increasing the amplitude of vibration increased the energy dissipation and the weld strength. For the semicrystalline polymers, increasing the weld time improved strength up to weld times greater than 1.5 s, where strength leveled off. For the amorphous polymers, the weld strength increased with Increasing weld time up to times of 0.8 s; for longer weld times, the power required was too high, causing overloading of the welder. Monitoring of the energy dissipation and static displacement or collapse provided valuable information on weld quality.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760292311
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Simulation of test conditions for typical pulverized coal combustors (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 672-676 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300427
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Influence of free stream velocity on the entrainment by single- and two-phase axisymmetric jets (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 1010-1013 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300626
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Characteristics of initial region of a double concentric jet (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 169-171 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300123
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Numerical simulation of fluid flow and heat transfer in a single-screw extruder with different dies (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 261-273 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: In a plasticating screw extruder, a polymer melt forms in the melting zone of the extruder. Pressurization of the molten polymer takes place in the melting and the metering sections so that the melt can flow through the restricted passage of the die and assume a desired shape. In a melt fed extruder, the throughput is governed by the pressure rise over the entire length of the extruder. The pressure developed in the screw channel may also be employed in rapid filling of molds, such as those in injection molding. When the geometry of the screw, the barrel temperature, and the die are selected, a unique set of operating parameters arise for a particular flow rate or screw speed. In the present study, numerical and analytical methods are used to calculate the transport in the extruder and the pressure drop in the die. An iterative numerical method based on solving the equations of motion and energy in the screw channel and a correction scheme to couple the die with the screw channel is discussed. The numerical algorithm is capable of handling an arbitrary variation of the viscosity of the polymeric fluid with the shear rate and temperature. The results obtained by simulating the fluid flow in the screw channel are compared with available numerical and experimental results in the literature, indicating good agreement. The performance characteristics of the extruder, for chosen thermal boundary conditions and screw geometry, are presented for different die geometries and different fluids. The important considerations that arise in the numerical simulation of the extrusion process are also discussed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760350307
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    facet.materialart.
    Unknown
    Structural insights into the evolutionary paths of oxylipin biosynthetic enzymes (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-08-22
    Description: The oxylipin pathway generates not only prostaglandin-like jasmonates but also green leaf volatiles (GLVs), which confer characteristic aromas to fruits and vegetables. Although allene oxide synthase (AOS) and hydroperoxide lyase are atypical cytochrome P450 family members involved in the synthesis of jasmonates and GLVs, respectively, it is unknown how these enzymes rearrange their hydroperoxide substrates into different products. Here we present the crystal structures of Arabidopsis thaliana AOS, free and in complex with substrate or intermediate analogues. The structures reveal an unusual active site poised to control the reactivity of an epoxyallylic radical and its cation by means of interactions with an aromatic pi-system. Replacing the amino acid involved in these steps by a non-polar residue markedly reduces AOS activity and, unexpectedly, is both necessary and sufficient for converting AOS into a GLV biosynthetic enzyme. Furthermore, by combining our structural data with bioinformatic and biochemical analyses, we have discovered previously unknown hydroperoxide lyase in plant growth-promoting rhizobacteria, AOS in coral, and epoxyalcohol synthase in amphioxus. These results indicate that oxylipin biosynthetic genes were present in the last common ancestor of plants and animals, but were subsequently lost in all metazoan lineages except Placozoa, Cnidaria and Cephalochordata.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Dong-Sun -- Nioche, Pierre -- Hamberg, Mats -- Raman, C S -- R01 AI054444/AI/NIAID NIH HHS/ -- England -- Nature. 2008 Sep 18;455(7211):363-8. doi: 10.1038/nature07307. Epub 2008 Aug 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, University of Texas Medical School, Houston, Texas 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18716621" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arabidopsis/enzymology/genetics ; Binding Sites ; Catalysis ; Cytochrome P-450 Enzyme System/chemistry/metabolism ; *Evolution, Molecular ; Intramolecular Oxidoreductases/*chemistry/genetics/*metabolism ; Models, Chemical ; Models, Molecular ; Molecular Sequence Data ; Oxylipins/*metabolism ; Point Mutation/genetics ; Protein Conformation
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Cell biology: Stairway to the proteasome (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-12-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raman, Malavika -- Harper, J Wade -- R01 AG011085/AG/NIA NIH HHS/ -- R01 GM070565/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Dec 3;462(7273):585-6. doi: 10.1038/462585a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19956252" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Biology ; Cyclin E/metabolism ; Humans ; Models, Molecular ; Proteasome Endopeptidase Complex/*physiology ; Ubiquitin-Activating Enzymes/metabolism ; Ubiquitination/*physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Hemagglutinin receptor binding avidity drives influenza A virus antigenic drift (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-11-11
    Description: Rapid antigenic evolution in the influenza A virus hemagglutinin precludes effective vaccination with existing vaccines. To understand this phenomenon, we passaged virus in mice immunized with influenza vaccine. Neutralizing antibodies selected mutants with single-amino acid hemagglutinin substitutions that increased virus binding to cell surface glycan receptors. Passaging these high-avidity binding mutants in naive mice, but not immune mice, selected for additional hemagglutinin substitutions that decreased cellular receptor binding avidity. Analyzing a panel of monoclonal antibody hemagglutinin escape mutants revealed a positive correlation between receptor binding avidity and escape from polyclonal antibodies. We propose that in response to variation in neutralizing antibody pressure between individuals, influenza A virus evolves by adjusting receptor binding avidity via amino acid substitutions throughout the hemagglutinin globular domain, many of which simultaneously alter antigenicity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784927/" 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/PMC2784927/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hensley, Scott E -- Das, Suman R -- Bailey, Adam L -- Schmidt, Loren M -- Hickman, Heather D -- Jayaraman, Akila -- Viswanathan, Karthik -- Raman, Rahul -- Sasisekharan, Ram -- Bennink, Jack R -- Yewdell, Jonathan W -- GM 57073/GM/NIGMS NIH HHS/ -- U54 GM62116/GM/NIGMS NIH HHS/ -- Z01 AI001014-01/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2009 Oct 30;326(5953):734-6. doi: 10.1126/science.1178258.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19900932" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Neutralizing/immunology ; Antibodies, Viral/immunology ; Antigenic Variation/genetics/*immunology ; Cell Line ; Hemagglutinin Glycoproteins, Influenza Virus/genetics/immunology/*metabolism ; Influenza A Virus, H1N1 Subtype/genetics/*immunology ; Influenza Vaccines/immunology ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Models, Immunological ; Mutation ; Receptors, Virus/*metabolism ; Serial Passage
    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)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Femtomolar sensitivity of a NO sensor from Clostridium botulinum (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-10-09
    Description: Nitric oxide (NO) is extremely toxic to Clostridium botulinum, but its molecular targets are unknown. Here, we identify a heme protein sensor (SONO) that displays femtomolar affinity for NO. The crystal structure of the SONO heme domain reveals a previously undescribed fold and a strategically placed tyrosine residue that modulates heme-nitrosyl coordination. Furthermore, the domain architecture of a SONO ortholog cloned from Chlamydomonas reinhardtii indicates that NO signaling through cyclic guanosine monophosphate arose before the origin of multicellular eukaryotes. Our findings have broad implications for understanding bacterial responses to NO, as well as for the activation of mammalian NO-sensitive guanylyl cyclase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nioche, Pierre -- Berka, Vladimir -- Vipond, Julia -- Minton, Nigel -- Tsai, Ah-Lim -- Raman, C S -- AY343540/PHS HHS/ -- R01 AI054444/AI/NIAID NIH HHS/ -- R01 AI054444-05/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2004 Nov 26;306(5701):1550-3. Epub 2004 Oct 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Biology Research Center and Department of Biochemistry and Molecular Biology, University of Texas Medical School, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15472039" target="_blank"〉PubMed〈/a〉
    Keywords: Aerobiosis ; Amino Acid Sequence ; Amino Acid Substitution ; Animals ; Bacterial Proteins/chemistry/metabolism ; Biological Evolution ; Carrier Proteins/*chemistry/genetics/*metabolism ; Chemotaxis ; Chlamydomonas reinhardtii/chemistry/genetics/metabolism ; Cloning, Molecular ; Clostridium botulinum/*chemistry/genetics/*metabolism ; Crystallography, X-Ray ; Electron Spin Resonance Spectroscopy ; Escherichia coli/genetics/growth & development ; Guanylate Cyclase ; Heme/chemistry/metabolism ; Hemeproteins/*chemistry/genetics/*metabolism ; Humans ; Hydrogen Bonding ; Ligands ; Models, Molecular ; Molecular Sequence Data ; Nitric Oxide/*metabolism ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protoporphyrins/analysis/metabolism ; Receptors, Cytoplasmic and Nuclear/chemistry/metabolism ; Sequence Alignment ; Signal Transduction ; Static Electricity ; Thermoanaerobacter/chemistry
    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)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Axonopathy and transport deficits early in the pathogenesis of Alzheimer's disease (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-26
    Description: We identified axonal defects in mouse models of Alzheimer's disease that preceded known disease-related pathology by more than a year; we observed similar axonal defects in the early stages of Alzheimer's disease in humans. Axonal defects consisted of swellings that accumulated abnormal amounts of microtubule-associated and molecular motor proteins, organelles, and vesicles. Impairing axonal transport by reducing the dosage of a kinesin molecular motor protein enhanced the frequency of axonal defects and increased amyloid-beta peptide levels and amyloid deposition. Reductions in microtubule-dependent transport may stimulate proteolytic processing of beta-amyloid precursor protein, resulting in the development of senile plaques and Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokin, Gorazd B -- Lillo, Concepcion -- Falzone, Tomas L -- Brusch, Richard G -- Rockenstein, Edward -- Mount, Stephanie L -- Raman, Rema -- Davies, Peter -- Masliah, Eliezer -- Williams, David S -- Goldstein, Lawrence S B -- EY12598/EY/NEI NIH HHS/ -- EY13408/EY/NEI NIH HHS/ -- P50 AG05131/AG/NIA NIH HHS/ -- R01 EY007042/EY/NEI NIH HHS/ -- R01 EY007042-19/EY/NEI NIH HHS/ -- R01 EY013408/EY/NEI NIH HHS/ -- R01 EY013408-02/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1282-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Cellular and Molecular Medicine, School of Medicine, University of California San Diego (UCSD), 9500 Gilman Drive, La Jolla, CA 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15731448" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; Aged, 80 and over ; Alzheimer Disease/genetics/*metabolism/*pathology ; Amyloid beta-Peptides/metabolism ; Amyloid beta-Protein Precursor/metabolism ; Animals ; *Axonal Transport ; Axons/*pathology/physiology ; Basal Nucleus of Meynert/pathology ; Brain/*metabolism/*pathology ; Cells, Cultured ; Cytoplasmic Vesicles/ultrastructure ; Female ; Hippocampus ; Humans ; Kinesin/metabolism ; Male ; Mice ; Mice, Inbred C3H ; Mice, Inbred C57BL ; Microtubule-Associated Proteins/genetics/metabolism ; Neurons/metabolism ; Organelles/ultrastructure ; Plaque, Amyloid/pathology ; Time Factors
    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)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...