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  • Polymer and Materials Science  (275)
  • Humans  (108)
  • 1985-1989  (383)
  • 1980-1984
  • 1945-1949
  • 1987  (383)
  • 1
    Electronic Resource
    Electronic Resource
    Ethylene polymerization over organochromium catalysts: A comparison between closed and open pentadienyl ligands (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 2063-2075 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Divalent organochromium compounds, Cr(Lig)2, often become active catalysts for the polymerization of ethylene when deposited onto an oxide carrier such as silica or aluminophosphate. Hydroxyl groups are thought to react, releasing one ligand and binding the chromium to the surface. The behavior of the catalyst is then governed by the remaining ligand and the type of carrier. In this study two types of ligands were investigated: cyclopentadienyl and its open ring analog dimethylpentadienyl. This small difference in the type of ligand produces a fundamental difference in the polymerization mechanism. For comparison the mixed ligand chromocene, with one open and one closed ligand, was also synthesized and tested for polymerization.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250804
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of low density lipoproteins onto selected biomedical polymers (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 683-700 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This study examines the interaction of human low density lipoprotein (LDL) with a select group of biomedical polymers. The adsorption characteristics of LDL on cured filler-free poly(dimethyl Siloxane) (C-PDMS), Biomer, Cardiomat 610, Kraton 1650, poly(hydroxyethyl methacrylate) (PHEMA) and glass are presented. Adsorption of LDL to charged hydrophilic glass control surfaces occurred rapidly, reaching plateau concentrations within one minute (0.19 ± 0.01 ug/cm2). Adsorption of LDL to polymer surfaces appeared to be dependent upon both the polymer hydrophobicity (or apolar nature), and flexibility (or dynamic nature) at the interface. Increased surface concentrations were observed for Biomer (0.32 ± 0.01 ug/cm2) as well as other polymers which exhibited both hydrophobic and elastomeric próperties. Temperature changes between 25°C and 37°C were found to significantly influence the surface concentration of LDL on Biomer (0.16 ± 0.01 ug/cm2 at 25°C versus 0.32 ± 0.01 ug/cm2 at 37°C). A lipid core phase transition at 36°C was believed to be responsible for the temperature influence. Preliminary competitive adsorption studies of LDL with albumin (HSA) and serum on silicone surfaces suggests that LDL adsorption occurred rapidly and preferentially (0.25 ± 0.01 ug/cm2 for LDL alone; 0.33 ± 0.01 ug/cm2 for LDL + HSA; 0.15 ± 0.01 ug/cm2 LDL + serum). Preliminary studies on the role of LDL in calcification were not conclusive. It can be concluded that LDL adsorption is dependent upon polymer hydrophobicity, flexibility and temperature. Competitive adsorption experiments suggests that LDL may have substantial influence on protein adsorption.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820210602
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  • 3
    Electronic Resource
    Electronic Resource
    A SIMS calibration exercise using multi-element (Cr, Fe and Zn) implanted GaAs (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 10 (1987), S. 338-342 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Multi-element (52Cr, 56Fe and 66Zn) implanted GaAs samples have been prepared specially for SIMS calibration. Absolute chemical measurements gave retained ion doses which agreed to within 12% of the nominal implanted dose (2.0 × 1014 atoms cm-2). Comparative SIMS depth profiles with five instruments gave Cr mode depth data which showed a variability of 5%. After data normalization to a common mode depth (168 nm) the shape of all profiles showed good agreement. SIMS anàlysis of similar samples containing lower dose implants (1.0 × 1013 atoms cm-2) showed that ∼50% of the Cr was contained in the near surface region (0-0.03 μm). This surface peak was not observed in profiles of samples which had been singly implanted with Cr. It is proposed that the Cr surface peak results from radiation enhanced out-diffusion initiated by the subsequent Fe implant. Whilst the high dose multi-implant samples showed a similar Cr surface accumulation, its magnitude in relation to the ion implanted dose, was smaller. These samples therefore form reliable calibration specimens for the simultaneous determination of the secondary ion responses of Cr, Fe and Zn in GaAs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740100705
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  • 4
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    A mammalian mitochondrial RNA processing activity contains nucleus-encoded RNA (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-06
    Description: Ribonuclease mitochondrial RNA processing, a site-specific endoribonuclease involved in primer RNA metabolism in mammalian mitochondria, requires an RNA component for its activity. On the basis of copurification and selective inactivation with complementary oligonucleotides, a 135-nucleotide RNA species, not encoded in the mitochondrial genome, is identified as the RNA moiety of the endoribonuclease. This finding implies transport of a nucleus-encoded RNA, essential for organelle DNA replication, to the mitochondrial matrix.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, D D -- Clayton, D A -- GM-33088-16/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Mar 6;235(4793):1178-84.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2434997" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Cell Nucleus/*physiology ; Chemical Phenomena ; Chemistry ; Drug Resistance ; Endonucleases/isolation & purification/metabolism ; Enzyme Activation/drug effects ; *Genetic Code ; Humans ; Mammals/*genetics/metabolism ; Micrococcal Nuclease/pharmacology ; Mitochondria/*metabolism ; Oligonucleotides/pharmacology ; Organoids/physiology ; RNA/*biosynthesis/genetics/isolation & purification/physiology ; Ribonucleases/metabolism ; Subcellular Fractions/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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  • 5
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    Identification of human uromodulin as the Tamm-Horsfall urinary glycoprotein (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-03
    Description: The primary structure of human uromodulin, a 616-amino acid, 85-kilodalton glycoprotein with in vitro immunosuppressive properties, was determined through isolation and characterization of complementary DNA and genomic clones. The amino acid sequence encoded by one of the exons of the uromodulin gene has homology to the low-density-lipoprotein receptor and the epidermal growth factor precursor. Northern hybridization analyses demonstrate that uromodulin is synthesized by the kidney. Evidence is provided that uromodulin is identical to the previously characterized Tamm-Horsfall glycoprotein, the most abundant protein in normal human urine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pennica, D -- Kohr, W J -- Kuang, W J -- Glaister, D -- Aggarwal, B B -- Chen, E Y -- Goeddel, D V -- New York, N.Y. -- Science. 1987 Apr 3;236(4797):83-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3453112" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acids/analysis ; Base Sequence ; Chemistry, Physical ; Cloning, Molecular ; Cysteine ; DNA/genetics ; Gene Expression Regulation ; Genes ; Glycoproteins/*genetics ; Humans ; Mucoproteins/*analysis/*genetics ; Peptide Fragments/analysis ; Physicochemical Phenomena ; RNA, Messenger/genetics ; Uromodulin
    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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  • 6
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    Conservation of brain amyloid proteins in aged mammals and humans with Alzheimer's disease (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-02-20
    Description: The formation of clusters of altered axons and dendrites surrounding extracellular deposits of amyloid filaments (neuritic plaques) is a major feature of the human brain in both aging and Alzheimer's disease. A panel of antibodies against amyloid filaments and their constituent proteins from humans with Alzheimer's disease cross-reacted with neuritic plaque and cerebrovascular amyloid deposits in five other species of aged mammals, including monkey, orangutan, polar bear, and dog. Antibodies to a 28-amino acid peptide representing the partial protein sequence of the human amyloid filaments recognized the cortical and microvascular amyloid of all of the aged mammals examined. Plaque amyloid, plaque neurites, and neuronal cell bodies in the aged animals showed no reaction with antibodies to human paired helical filaments. Thus, with age, the amyloid proteins associated with progressive cortical degeneration in Alzheimer's disease are also deposited in the brains of other mammals. Aged primates can provide biochemically relevant models for principal features of Alzheimer's disease: cerebrovascular amyloidosis and neuritic plaque formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selkoe, D J -- Bell, D S -- Podlisny, M B -- Price, D L -- Cork, L C -- AG05134/AG/NIA NIH HHS/ -- AG06173/AG/NIA NIH HHS/ -- NS23340/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1987 Feb 20;235(4791):873-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3544219" target="_blank"〉PubMed〈/a〉
    Keywords: *Aging ; Alzheimer Disease/pathology/*physiopathology ; Amyloid/immunology/*metabolism ; Amyloidosis/pathology/*physiopathology ; Animals ; Brain/pathology/*physiopathology ; Humans ; Immunoenzyme Techniques ; Macaca mulatta ; Pongo pygmaeus ; Saimiri ; Ursidae
    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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  • 7
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    Mapping human brain monoamine oxidase A and B with 11C-labeled suicide inactivators and PET (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-01-23
    Description: The regional distributions of monoamine oxidase (MAO) types A and B have been identified in human brain in vivo with intravenously injected 11C-labeled suicide enzyme inactivators, clorgyline and L-deprenyl, and positron emission tomography. The rapid brain uptake and retention of radioactivity for both 11C tracers indicated irreversible trapping. The anatomical distribution of 11C paralleled the distribution of MAO A and MAO B in human brain in autopsy material. The corpus striatum, thalamus, and brainstem contained high MAO activity. The magnitudes of uptake of both [11C]clorgyline and L-[11C]deprenyl were markedly reduced in one subject treated with the antidepressant MAO inhibitor phenelzine. A comparison of the brain uptake and retention of the 11C-labeled inactive (D-) and active (L-) enantiomers of deprenyl showed rapid clearance of the inactive enantiomer and retention of the active enantiomer within MAO B-rich brain structures, in agreement with the known stereoselectivity of MAO B for L-deprenyl. Prior treatment with unlabeled L-deprenyl prevented retention of L-[11C]deprenyl. Thus, suicide enzyme inactivators labeled with positron emitters can be used to quantitate the distribution and kinetic characteristics of MAO in human brain structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fowler, J S -- MacGregor, R R -- Wolf, A P -- Arnett, C D -- Dewey, S L -- Schlyer, D -- Christman, D -- Logan, J -- Smith, M -- Sachs, H -- NS-15638/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 23;235(4787):481-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3099392" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Aged, 80 and over ; Brain/*enzymology ; Brain Stem/enzymology ; Cerebral Cortex/enzymology ; Clorgyline ; Corpus Striatum/enzymology ; Humans ; Monoamine Oxidase/*metabolism ; Selegiline ; Thalamus/enzymology ; Tomography, Emission-Computed
    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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    Localization of amyloid beta protein messenger RNA in brains from patients with Alzheimer's disease (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-07-03
    Description: The distribution of cells containing messenger RNA that encodes amyloid beta protein was determined in hippocampi and in various cortical regions from cynomolgus monkeys, normal humans, and patients with Alzheimer's disease by in situ hybridization. Both 35S-labeled RNA antisense and sense probes to amyloid beta protein messenger RNA were used to ensure specific hybridization. Messenger RNA for amyloid beta protein was expressed in a subset of neurons in the prefrontal cortex from monkeys, normal humans, and patients with Alzheimer's disease. This messenger RNA was also present in the neurons of all the hippocampal fields from monkeys, normal humans and, although to a lesser extent in cornu ammonis 1, patients with Alzheimer's disease. The distribution of amyloid beta protein messenger RNA was similar to that of the neurofibrillary tangles of Alzheimer's disease in some regions, but the messenger RNA was also expressed in other neurons that are not usually involved in the pathology of Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bahmanyar, S -- Higgins, G A -- Goldgaber, D -- Lewis, D A -- Morrison, J H -- Wilson, M C -- Shankar, S K -- Gajdusek, D C -- AG05131/AG/NIA NIH HHS/ -- MH00519/MH/NIMH NIH HHS/ -- NS23038/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 3;237(4810):77-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3299701" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*genetics ; Amyloid/*genetics ; Amyloid beta-Peptides ; Animals ; Brain/*physiopathology ; Cerebral Cortex/physiology ; Gene Expression Regulation ; Hippocampus/physiology ; Humans ; Macaca fascicularis ; Nucleic Acid Hybridization ; RNA, Messenger/genetics
    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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    Gene for von Recklinghausen neurofibromatosis is in the pericentromeric region of chromosome 17 (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-05-29
    Description: Linkage analysis of 15 Utah kindreds demonstrated that a gene responsible for von Recklinghausen neurofibromatosis (NF) is located near the centromere on chromosome 17. The families also gave no evidence for heterogeneity, indicating that a significant proportion of NF cases are due to mutations at a single locus. Further genetic analysis can now refine this localization and may lead to the eventual identification and cloning of the defective gene responsible for this disorder.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barker, D -- Wright, E -- Nguyen, K -- Cannon, L -- Fain, P -- Goldgar, D -- Bishop, D T -- Carey, J -- Baty, B -- Kivlin, J -- CA 28854/CA/NCI NIH HHS/ -- CA 36362/CA/NCI NIH HHS/ -- GM 29090/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 May 29;236(4805):1100-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3107130" target="_blank"〉PubMed〈/a〉
    Keywords: Centromere ; Chromosome Mapping ; *Chromosomes, Human, Pair 17/ultrastructure ; DNA, Recombinant ; Female ; *Genes ; Genetic Linkage ; Humans ; Male ; Neurofibromatosis 1/*genetics ; Nucleic Acid Hybridization
    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
    Electronic Resource
    Electronic Resource
    Flame retardation of poly(ethylene terephthalate) containing poly(4-bromo styrene), poly(vinyl bromide), and poly(vinylidene bromide)Issued as NRCC No. 27244. (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2041-2052 
    Details
    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 pyrolysis and gaseous combustion of poly(ethylene terephthalate) (PET) incorporating poly(4-bromostyrene), poly(vinyl bromide), and poly(vinylidene bromide) has been studied using thermogravimetry, flammability limit evaluation, and hydrogen bromide (HBr) evolution techniques. The data obtained have been compared with limiting oxygen index (LOI) flammability data to elucidate flame retardation mechanisms. All the organo bromides studied (applied either via topical treatment or radiation grafting) released HBr on pyrolysis which is capable of inhibiting the gas phase combustion reactions. Condensed phase interactions were also detected which were capable of altering the gaseous pyrolysates. Thermal stability considerations suggest that, although the aliphatic bromides are excellent sources of HBr, they are not ideal flame retardants for PET.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330616
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