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  • 1
    Electronic Resource
    Electronic Resource
    The ring-opening metathesis polymerization of (±)-endo-bicyclo[2.2.1]hept-5-en-2-yl acetate; microstructure of the polymer (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 3203-3207 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The monomer (±)-endo-bicyclo[2.2.1]hept-5-en-2-yl acetate (1) was polymerized by Re-, W-, Mo- and Ru-based metathesis catalysts to yield polymers with cis double bond contents ranging from 76% to 16%. A complete assignment was made of the lines in the 13C NMR spectra. No significant head-tail bias was observed and no splittings due to tacticity were detected.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021941123
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  • 2
    Electronic Resource
    Electronic Resource
    The ring-opening metathesis polymerization of (±)-5-endo-methoxynorborn-2-ene. Microstructure of the polymers (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 3493-3497 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The title monomer (±)-5-endo-methoxynorborn-2-ene ((±)-5-endo-methoxybicyclo[2.2.1]-hept-2-ene, 1) was polymerized by Ru-, W-, Ir-, Re- and Mo-based metathesis catalysts to yield polymers with cis contents ranging from 10% to 48%. An assignment of the 13C NMR spectra was made. No significant head-tail bias was observed and no splitting due to tacticity could be positively identified.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021941226
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  • 3
    Electronic Resource
    Electronic Resource
    13C NMR spectra of polymers made by ring-opening polymerization of (±)-endo-5-methylbicyclo[2.2.1]hept-2-ene using metathesis catalystsDedicated to Professor Dr. G. V. Schulz on his 75th birthday (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1847-1854 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A range of olefin metathesis catalysts has been used to prepare ring-opened polymers of (±)-endo-5-methylbicyclo[2.2.1]hept-2-ene (1), having cis double bond contents of 22-100%. The 13C NMR spectra of these polymers are interpreted in terms of TH, TT, HH, HT and tt, tc, ct, ccstructures (T = tail, H = head, referring to the methyl group orientation; t = trans, c = cis, referring to the double bond configuration). The fine structure of the olefinic region at 75 MHz indicates that the cis/trans double bond distribution is blocky when the cis content is more than 50%. The chemical shifts of the ring carbons indicate puckering of the cyclopentane rings. The cis relationship of the methyl carbon and the adjacent olefinic carbons causes an upfield shift in both cases.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820624
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  • 4
    Electronic Resource
    Electronic Resource
    Metathesis polymerization of endo-5- and exo-5-chloromethylbicyclo[2.2.1]hept-2-ene and of 5,5-bis(chloromethyl)bicyclo[2.2.1]hept-2-ene; microstructure of the polymers (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3245-3260 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The three title monomers were polymerized using a variety of Ru-, Ir-, Mo-, W- and Re-based metathesis catalyst systems to yield polymers having a wide range of cis double bond contents in each case. The 13C NMR spectra of the polymers were interpreted in terms of cis/trans, head/tail and m/r microstructures. No head-tail bias was observed in any of the polymers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950921
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  • 5
    Electronic Resource
    Electronic Resource
    Ring-opening metathesis polymerization of endo- and exo-5-methoxymethylbicyclo[2.2.1]hept-2-ene; microstructure of the polymers (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 1189-1197 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The title monomers 1 and 2 were polymerized by Ru-, Ir-, Mo-, W- and Re-based metathesis catalysts to yield polymers with cis contents ranging from 10% to at least 90% for 1 and 23-60% for 2. Assignments of the 13C NMR spectra were made. No significant head-tail bias was observed in either polymer. A high-trans polymer made from the optically active endo monomer ((-)-1) was atactic, while high-cis polymers could be either atactic or biased towards syndiotactic, depending on the catalyst.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950407
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  • 6
    Electronic Resource
    Electronic Resource
    Quenching of the emission of tryptophan, tyrosine, and serum albumins by cupric ion (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 1229-1242 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of cupric ion on the emission of tryptophan, tyrosine, and serum albumins is studied by emission spectroscopy and lifetime measurements. It is found that whenever cupric ion is bound to tryptophan or tyrosine, their emissions are quenched completely. The quenching may be due to an electron transfer mechanism. The fluorescence of complexes of cupric ions with serum albumins is partially quenched; this is because energy is transferred from tryptophan to the complexed cupric ions by a dipolar energy transfer mechanism. It is deduced from the present study that the tryptophan in the human serum albumin molecule is between 11 and 16 Å from the nearest eupric ion binding sites (assumed to be at the surface of the protein) and that one of the tryptophan in the bovine serum albumin molecule is very close to the cupric ion binding sites and the other is near the center of the bovine serum albumin molecule. It is also found that the deuterium solvent effect on serum albumin fluorescence is very small, and that the quenching of bovine serum albumin fluorescence at the N-F transition is the result of quenching of the fluorescence of both tryptophans. The phosphorescence lifetime apparatus, capable of measuring decay times of signals with intensities changing over a few orders of magnitude, and the ratio spectrofluorometer, both of which were constructed in this laboratory, are also described.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100712
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  • 7
    Electronic Resource
    Electronic Resource
    Energy transfer between tryptophans and aromatic ligands in apomyoglobin (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 1317-1329 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding of three aromatic molecules to apomyoglobin has been investigated. In each case equilibrium dialysis studies and tryptophan fluorescence quenching studies indicate that a one to one complex has been formed. The fluorescence quenching studies further suggest that the binding of the aromatic molecules is at the heme site with possible involvement of the arginine CD3. Xenon, which is known to quench the fluorescence of aromatic hydrocarbons, is found to be bound to apomyoglobin-aromatic molecule complexes and quenches the emission of the aromatic molecule in the complexes. Oxygen quenches pyrene fluorescence in water solution but does not quench the pyrene fluorescence from the apomyoglobin-pyrene complex. This is explained by a slower rate of diffusion of oxygen to pyrene in the apomyoglobin-pyrene complex.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100806
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal conductivity of oriented crystalline polymers (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1187-1207 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal conductivities of six oriented semicrystalline polymers which range from 0.37 to 0.63 in crystallinity and 1 to 5 in draw ratio λ (up to about 15 for two polymers) have been measured between 100 and 340 K. It was found that for increasing λ the conductivity K∥ (along the draw direction n̂) increases rapidly while K⊥ (normal to n̂) decreases slightly; K∥ also increases with temperature, but K⊥ shows no simple pattern in temperature dependence. These general features can be reproduced reasonably well at low draw ratio (λ 〈 5) by the modified Maxwell model, and the discrepancy in details may be attributed to the fact that the model does not take into account the possible anisotropy of the amorphous phase of the oriented polymers. At high draw ratio the intercrystalline bridge effect becomes important, and one must resort to the Takayanagi model, but the lack of corroborating x-ray data has rendered a detailed comparison impossible.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180603
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  • 9
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    Pathological alpha-synuclein transmission initiates Parkinson-like neurodegeneration in nontransgenic mice (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-11-20
    Description: Parkinson's disease is characterized by abundant alpha-synuclein (alpha-Syn) neuronal inclusions, known as Lewy bodies and Lewy neurites, and the massive loss of midbrain dopamine neurons. However, a cause-and-effect relationship between Lewy inclusion formation and neurodegeneration remains unclear. Here, we found that in wild-type nontransgenic mice, a single intrastriatal inoculation of synthetic alpha-Syn fibrils led to the cell-to-cell transmission of pathologic alpha-Syn and Parkinson's-like Lewy pathology in anatomically interconnected regions. Lewy pathology accumulation resulted in progressive loss of dopamine neurons in the substantia nigra pars compacta, but not in the adjacent ventral tegmental area, and was accompanied by reduced dopamine levels culminating in motor deficits. This recapitulation of a neurodegenerative cascade thus establishes a mechanistic link between transmission of pathologic alpha-Syn and the cardinal features of Parkinson's disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3552321/" 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/PMC3552321/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luk, Kelvin C -- Kehm, Victoria -- Carroll, Jenna -- Zhang, Bin -- O'Brien, Patrick -- Trojanowski, John Q -- Lee, Virginia M-Y -- NS053488/NS/NINDS NIH HHS/ -- P50 NS053488/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2012 Nov 16;338(6109):949-53. doi: 10.1126/science.1227157.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Laboratory Medicine, Institute on Aging and Center for Neurodegenerative Disease Research, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104-4283, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23161999" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Corpus Striatum/drug effects/*metabolism/pathology ; Dopamine ; Dopaminergic Neurons/drug effects/metabolism/pathology ; Injections ; Lewy Bodies/drug effects/*metabolism/pathology ; Mice ; Parkinsonian Disorders/*metabolism/pathology ; Protein Folding ; Protein Transport ; Recombinant Proteins/administration & dosage/chemistry/metabolism ; Substantia Nigra/drug effects/metabolism/pathology ; alpha-Synuclein/administration & dosage/chemistry/*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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  • 10
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    Ornithine decarboxylase: essential in proliferation but not differentiation of human promyelocytic leukemia cells (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-04-02
    Description: The ornithine decarboxylase inhibitor DL-alpha-difluoromethyl ornithine inhibited a proliferation-associated increase in ornithine decarboxylase activity in cultured human promyelocytic leukemia cells, resulting in a marked suppression of cell proliferation and subsequent cell loss. It also inhibited increases in ornithine decarboxylase activity associated with the phorbol ester-induced conversion of promyelocytic HL-60 cells to monocyte-like cells and the retinoic acid-induced conversion to granulocyte-like cells. However, the inhibition of ornithine decarboxylase activity did not prevent cellular differentiation. These results suggest that polyamine biosynthesis has a specific role in cell proliferation rather than in inducing differentiation that is not accompanied by proliferation. The data also demonstrate that cessation of proliferation in HL-60 cells is not necessarily associated with differentiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luk, G D -- Civin, C I -- Weissman, R M -- Baylin, S B -- AM-27447/AM/NIADDK NIH HHS/ -- CA-18404/CA/NCI NIH HHS/ -- HL-19157/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1982 Apr 2;216(4541):75-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6950518" target="_blank"〉PubMed〈/a〉
    Keywords: Carboxy-Lyases/*physiology ; Cell Adhesion ; Cell Differentiation ; Cell Division ; Cells, Cultured ; Female ; Granulocytes/pathology ; Humans ; Leukemia, Myeloid, Acute/*enzymology/pathology ; Macrophages/pathology ; Ornithine Decarboxylase/*physiology ; Polyamines/biosynthesis ; Tetradecanoylphorbol Acetate/pharmacology ; Tretinoin/pharmacology
    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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