Kooperativer Bibliotheksverbund

Berlin Brandenburg

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  • 1
    In: International Journal of Energy Research, May 2013, Vol.37(6), pp.500-509
    Description: Lithium iron phosphate‐carbon (LiFePO/multiwalled carbon nanotubes (MWCNTs)) composite cathode materials were prepared by a hydrothermal method. In this study, we used MWCNTs as conductive additive. Poly (vinylidene fluoride‐co‐hexafluoropropylene)‐based solid polymer electrolyte (SPE) was applied. The structural and morphological performance of LiFePO/MWCNTs cathode materials was investigated by X‐ray diffraction and scanning electron microscopy/mapping. The electrochemical properties of Li/SPE/LiFePO‐MWCNTs coin‐type polymer batteries were analyzed by cyclic voltammetry, ac impedance and galvanostatic charge/discharge tests. Li/SPE/LiFePO‐MWCNTs polymer battery with 5 wt % MWCNTs demonstrates the highest discharge capacity and stable cyclability at room temperature. It is indicated that LiFePO‐MWCNTs can be used as the cathode materials for lithium polymer batteries. Copyright © 2011 John Wiley & Sons, Ltd.
    Keywords: Lithium Iron Phosphate‐Carbon ; Solid Polymer Electrolyte ; Lithium Polymer Battery
    ISSN: 0363-907X
    E-ISSN: 1099-114X
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  • 2
    In: Chemical Communications, 2014, Vol.51(6), pp.1039-1041
    Description: The polymerization of bio-renewable myrcene (MY), using a cationic -diimidosulfonate lutetium catalyst in high activity, afforded an unprecedented isotactic 3,4-polymyrcene (PMY) with a low T g (42 C). Based on this result, the random and block copolymerization of myrcene and isoprene (IP) resulted in novel elastomers that comprise the amorphous iso-3,4-PMY and iso-3,4-PIP sequences.
    Keywords: Metals ; Lutetium ; Catalysts ; Issues in Sustainable Development;
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 3
    In: Journal of Applied Polymer Science, 05 August 2014, Vol.131(15), pp.n/a-n/a
    Description: A series of cationic nickel(II) compounds with various counter ions ([BF], [CFSO]) and N‐bearing ligands (1,10‐phenanthroline, benzimidazole and terpyridine) were synthesized. The simple compound, Ni(Phen)Cl, was prepared as a reference compound. All title compounds were characterized by elemental analysis, and infrared spectra analyses and compounds, some specific ones, were further examined by X‐ray crystallographic analysis. Upon treatment with ethylaluminum sesquichloride, these nickel(II) compounds exhibited high activities (up to 88.5%/4 h) for butadiene polymerization and afforded liquid polybutadiene ( 〈 30,000) with a high ‐content (up to 92.1%). Various polymerization conditions were investigated in detail, and it was found that less steric hindrance of the ligands enhanced the catalytic activities of the nickel(II) compounds. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. , , 40511.
    Keywords: Catalysts ; Rubber ; X‐Ray
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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  • 4
    Language: English
    In: Organometallics, 08/24/2015, Vol.34(16), pp.4063-4068
    ISSN: 0276-7333
    E-ISSN: 1520-6041
    Source: American Chemical Society (via CrossRef)
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  • 5
    Language: English
    In: Macromolecules, 08/12/2014, Vol.47(15), pp.4971-4978
    ISSN: 0024-9297
    E-ISSN: 1520-5835
    Source: American Chemical Society (via CrossRef)
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  • 6
    In: Chemical Communications, 2018, Vol.54(68), pp.9462-9465
    Description: The synergistic effect of two anticancer drugs can significantly overcome the multidrug resistance of tumor cells and improve the drug bioavailability. Herein, two different anticancer drugs, camptothecin and chlorambucil, are successfully connected together by a disulfide linkage to get a novel drugdrug conjugated prodrug ( G ). Using water-soluble pillar[6]arene ( WP6 ) as a host molecule, a supramolecular hostguest complex WP6 G is formed, which can further self-assemble into supramolecular vesicles in aqueous solution. In the specific microenvironment of cancer cells, the disulfide linkage is destroyed and the two anticancer drugs can be released efficiently to achieve a better synergistic effect than a single anticancer drug. Notably, these prodrug nanocarriers can not only effectively kill the cancer cells but also obviously reduce the undesirable side effects on normal cells.
    Keywords: Antineoplastic Agents -- Pharmacology ; Camptothecin -- Pharmacology ; Chlorambucil -- Pharmacology ; Drug Carriers -- Chemistry ; Quaternary Ammonium Compounds -- Chemistry;
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 7
    Language: English
    In: Biochemical and Biophysical Research Communications, 18 November 2017, Vol.493(2), pp.964-970
    Description: Emerging evidence shows that obesity induces renal injury and is an independent risk factor for the development of chronic kidney disease (CKD), even without diabetes or hyperglycemia. Although multiple metabolic factors have been suggested to account for obesity-associated renal injury, the precious underlying mechanisms are not completely understood. Recent study shows that increased trimethylamine N-Oxide (TMAO), a gut microbiota-generated metabolite, directly contributes to renal interstitial fibrosis and dysfunction. Circulating TMAO is elevated in high-fat diets (HFD)-induced obese animals. Here we tested the hypothesis that elevated TMAO might play a contributory role in the development of renal dysfunction in a mouse model of HFD-induced obesity that mimics human obesity syndrome. Male C57BL/6 mice received either a low-fat diet (LFD) or a HFD, without or with 3,3-Dimethyl-1-butanol (DMB, a trimethylamine formation inhibitor) for 16 weeks. Compared with mice fed a LFD, mice fed a HFD developed obesity and metabolic disorders, and exhibited significantly elevated plasma TMAO levels at the end of the experiment. Molecular and morphological studies revealed that renal interstitial fibrosis, phosphorylation of SMAD3 (a key regulator of renal fibrosis), expression of kidney injury molecule-1 and plasma cystatin C were significantly increased in mice fed a HFD, compared with mice fed a LFD. Additionally, expression of NADPH oxidase-4 and pro-inflammatory cytokines tumor necrosis factor-α and interleukin-1 β was also augmented in mice fed a HFD as compared to mice fed a LFD. These molecular and morphological alterations observed in mice fed a HFD were prevented by concomitant treatment with DMB, which reduced plasma TMAO levels. Furthermore, elevated circulating TMAO levels were positively correlated with increased renal interstitial fibrosis and expression of kidney injury molecule-1. Notable, there was no difference in blood pressure among groups, and DMB treatment had no effects on body weight and metabolic parameters. These data suggest that HFD-induced obesity leads to elevations in gut microbiota-generated metabolite TMAO in the circulation, which contributes to renal interstitial fibrosis and dysfunction by promoting renal oxidative stress and inflammation. These findings may provide new insights into the mechanisms underlying obesity-associated CKD. Targeting TMAO may be a novel strategy for prevention and treatment of CKD in patients with obesity.
    Keywords: High-Fat Diet ; Trimethylamine N-Oxide ; Renal Injury ; Oxidative Stress ; Inflammation ; Biology ; Chemistry ; Anatomy & Physiology
    ISSN: 0006-291X
    E-ISSN: 1090-2104
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  • 8
    Language: English
    In: Polymer, 25 September 2016, Vol.100, pp.188-193
    Description: Three half-titanocene complexes bearing dibenzhydryl-substituted aryloxide ligands CpTiCl (O-2,6-Ph CH C H -4-Me), ; CpTiCl (O-2,6-Ph CH C H -4-OMe), ; Cp*TiCl (O-2,6-Ph CH C H -4-Me), were synthesized. All the complexes were characterized by NMR spectroscopy and elemental analysis. The molecular structures of complex and were further determined by single crystal X-ray diffraction, both of them adopt a three-legged distorted tetrahedral geometry in which the aryl substituents are orthogonally to the aryloxide group. Activated by methylaluminoxane (MAO), these complexes showed high activities (up to 2100 kg mol (Ti) h ) for ethylene polymerization. The resultant polyethylenes had high molecular weight and narrow molecular weight distributions. Furthermore, for the ethylene/1-hexene copolymerization, these complexes exhibited moderate activites and moderate to high 1-hexene incorporation ability. The sequence distributions of poly (ethylene-co-1-hexene)s are greatly influenced by the substituent on the cyclopentadineyl group of titanium complexes.
    Keywords: Bulky Aryloxide ; Half-Titanocene Complexes ; Ethylene Polymerization ; Copolymerization ; Engineering ; Chemistry
    ISSN: 0032-3861
    E-ISSN: 1873-2291
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  • 9
    Language: English
    In: Journal of Immunological Methods, 31 January 2013, Vol.387(1-2), pp.114-120
    Description: Adeno-associated viruses (AAVs) are common infective agents of primates. As such, healthy primates carry a large pool of AAV-specific neutralizing antibodies (NAbs), which inhibit AAV-mediated gene transfer therapeutic strategies. Thus, a clinical method to screen patient candidates for AAV-specific NAbs prior to treatment, especially with the frequently used AAV8 capsid component, will facilitate individualized treatment design and enhance therapeutic efficacy. In this study, we evaluated the efficacy and sensitivity of a passive immunity mouse model to quantitatively assess anti-AAV8 NAb titers, as compared to an immunoassay. The passive transfer model was established in C57BL/6 mice by tail vein injection of pre-defined sera from 23 male rhesus monkeys. The mice were then administered low dose (3e10 GC/mouse) self-complementary (sc) AAV8. The NAb assay indicated that 69.57% of the rhesus donors had pre-existing anti-AAV8 NAb. The NAb assay, however, was better able to detect low NAb titer (≤ 1:5), which can mediate neutralization . Indeed, 17 rhesus donors (74.0%) had pre-existing anti-AAV8 neutralization by NAb assay. Our findings indicated that the NAb assay is superior to the assay for detecting low NAb titers. ► 69.57% of the rhesus donors had pre-existing anti-AAV8 NAb by assay . ► 17 rhesus donors (74.0%) had pre-existing anti-AAV8 neutralization by NAb assay. ► 13.04% of samples had anti-AAV8 NAb titers lower than 1:20 by assay . ► NAb assay is superior to assay for the sample with low level NAb titer.
    Keywords: Adeno-Associated Virus ; Neutralizing Antibodies ; Passive Immunity ; Medicine ; Biology
    ISSN: 0022-1759
    E-ISSN: 1872-7905
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  • 10
    Language: English
    In: Journal of Applied Electrochemistry, 2011, Vol.41(1), pp.99-106
    Description: Lithium iron phosphate mixed with nano-sized acetylene black (LiFePO 4 -AB) was synthesized by a hydrothermal method and subsequent high-energy ball-milling process. Different contents of AB were added to improve the electronic conductivity of LiFePO 4 . The structural and morphological performance of LiFePO 4 -AB was investigated by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope, and high-resolution transmission electron microscope. LiFePO 4 -AB/Li batteries were fabricated in an argon-filled glove box, and their electrochemical performance was analyzed by cyclic voltammetry and charge/discharge tests. The XRD results demonstrate that LiFePO 4 -AB has an olivine-type structure indexed to the orthorhombic Pnma space group. LiFePO 4 -AB/Li battery with 10 wt% AB shows the best high-rate discharge properties with the discharge capacities of 116 mAh g −1 at 1 C and 85 mAh g −1 at 10 C at room temperature.
    Keywords: Lithium iron phosphate ; Lithium-ion batteries ; High-rate
    ISSN: 0021-891X
    E-ISSN: 1572-8838
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