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  • 1
    Language: English
    In: Journal of the American Chemical Society, 14 September 2011, Vol.133(36), pp.14151-3
    Description: Heating a bulk sample of [60]fullerene complexes, (η(5)-C(5)H(5))MC(60)R(5) (M = Fe, Ru, R = Me, Ph), produces small hydrocarbons because of coupling of R and C(5)H(5) via C-C and C-H bond activation. Upon observation by transmission electron microscopy, these complexes, encapsulated in single-walled carbon nanotubes, underwent C-C bond reorganization reactions to form new C-C bond networks, including a structure reminiscent of [70]fullerene. Quantitative comparison of the electron dose required to effect the C-C bond reorganization of fullerenes and organofullerenes in the presence of a single atom of Ru, Fe, or Ln and in the the absence of metal atoms indicated high catalytic activity of Ru and Fe atoms, as opposed to no catalytic activity of Ln. Organic molecules such as hydrocarbons and amides as well as pristine [60]fullerene maintain their structural integrity upon irradiation by ca. 100 times higher electron dose compared to the Ru and Fe organometallics. The results not only represent a rare example of direct observation of a single-metal catalysis but also have implications for the use of single metal atom catalysis in Group 8 metal heterogeneous catalysis.
    Keywords: Chemistry;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 2
    Language: English
    In: Materials Science & Engineering A, Jan 13, 2014, Vol.592, p.88(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.msea.2013.10.097 Byline: Takeshi Saito, Cz. Kapusta, Akito Takasaki Abstract: An FeaMnaSi bulk alloy was produced from elemental powders by mechanical alloying (MA) and subsequent sintering. The shape memory effect, microstructure and mechanical property of the bulk alloy were investigated. The [alpha] phase transformed into the [gamma] phase during MA. The MA played an essential role in stabilizing the [gamma] phase, which is associated with the shape memory effect in this alloy system. The [gamma] phase with small amounts of I[micro] and [alpha]' martensitic phases formed after subsequent sintering. After deformation, a [gamma][right arrow]I[micro] stress-induced martensitic phase transformation occurred. Shape recovery was observed after subsequent heating, associated with an I[micro][right arrow][gamma] reverse martensitic transformation. The grain size of the bulk alloy was about 2-3[mu]m, and the yield strength was about 500MPa. These results show that powder metallurgy, a combination of MA and subsequent sintering, has the potential to produce Fe-Mn-Si shape memory alloy. Author Affiliation: (a) Graduate School of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan (b) Department of Solid State Physics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland (c) Department of Engineering Science and Mechanics, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan Article History: Received 7 July 2013; Revised 29 October 2013; Accepted 31 October 2013
    Keywords: Sintering ; Shape Memory Alloys ; Powders (Particulate matter) ; Metal Products
    ISSN: 0921-5093
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of Alloys and Compounds, Sept, 2011, Vol.509, p.S779-S781
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2010.10.128 Byline: Takeshi Saito (a), Tomonori Yokoyama (a), Akito Takasaki (b) Keywords: TiNi shape memory alloy; Hydrogen; Martensitic transformation; X-ray diffraction; Mechanical alloying Abstract: a[paragraph] This work proposed influences hydrogen on martensitic transformation of TiNi(B2). a[paragraph] Two-stage martensitic transformation occurred at lower hydrogen concentration. a[paragraph] Hydrogen-induced martensitic transformation occurred at intermediate hydrogen concentration. a[paragraph] No martensitic transformation occurred at higher hydrogen concentration. Author Affiliation: (a) Graduate School of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, 135-8548 Tokyo, Japan (b) Department of Engineering Science and Mechanics, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, 135-8548 Tokyo, Japan Article History: Received 17 July 2010; Revised 19 October 2010; Accepted 22 October 2010
    Keywords: Hydrogenation ; Shape Memory Alloys
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Biochemical and Biophysical Research Communications
    Description: Polymethoxylated flavones (PMFs) are found in the peel tissues of some citrus species. Here, we report that PMFs, such as nobiletin, potentiate the cytolytic activity of KHYG-1 natural killer (NK) leukemia cells. Nobiletin markedly enhanced the expression of granzyme B, a serine protease that plays critical roles in the cytolytic activity of NK cells. The potentiated cytolytic activity induced by nobiletin was canceled by the granzyme B inhibitor Z-AAD-CMK. Nobiletin also increased the levels of phosphorylated CREB, ERK1/2, and p38 MAPK in KHYG-1 cells, which are known to participate in NK cell function. Inhibition of an upstream kinase of ERK1/2 failed to reduce the granzyme B expression and KHYG-1 cytolytic activity. Meanwhile, inhibition of p38 MAPK attenuated both granzyme B expression and KHYG-1 cytolytic activity. These results suggest that the primary role of nobiletin in KHYG-1 cytolytic activity lies in upregulation of granzyme B expression, at least in part, mediated through p38 MAPK function.
    Keywords: Granzyme B ; Khyg-1 ; Nk Cell ; Nobiletin ; Polymethoxylated Flavone ; P38 Mapk ; Biology ; Chemistry ; Anatomy & Physiology
    ISSN: 0006-291X
    ISSN: 18608965
    E-ISSN: 1090-2104
    E-ISSN: 18608973
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  • 5
    Language: English
    In: Mathematische Annalen, 2012, Vol.352(3), pp.567-580
    Description: The graded quotients of the logarithmic ramification groups of a local field of mixed characteristic is killed by the residue characteristic. Its characters are described by differential forms.
    Keywords: 11S15
    ISSN: 0025-5831
    E-ISSN: 1432-1807
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  • 6
    Language: English
    In: Science (New York, N.Y.), 02 August 2013, Vol.341(6145), pp.558-61
    Description: Robust transmission of information despite the presence of variation is a fundamental problem in cellular functions. However, the capability and characteristics of information transmission in signaling pathways remain poorly understood. We describe robustness and compensation of information transmission of signaling pathways at the cell population level. We calculated the mutual information transmitted through signaling pathways for the growth factor-mediated gene expression. Growth factors appeared to carry only information sufficient for a binary decision. Information transmission was generally more robust than average signal intensity despite pharmacological perturbations, and compensation of information transmission occurred. Information transmission to the biological output of neurite extension appeared robust. Cells may use information entropy as information so that messages can be robustly transmitted despite variation in molecular activities among individual cells.
    Keywords: Information Theory ; Signal Transduction
    ISSN: 00368075
    E-ISSN: 1095-9203
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  • 7
    Language: English
    In: Radiation Physics and Chemistry, May, 2014, Vol.98, p.57(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.radphyschem.2014.01.009 Byline: Takeshi Saito, Noriko Fujii Abstract: Carotenoids are considered to be involved in the radioresistant mechanisms of radioresistant bacteria. In these bacterial cells, carotenoids are present in biological lipids, and therefore may be related to the radiation-induced damage of lipids. However, only limited data are available for the role of carotenoids in such damage. In this study, we irradiated an [alpha]-linolenic acid-benzene solution with gamma rays and analyzed the resulting oxidative degradation and peroxidation damage in the presence or absence of two typical carotenoids: [beta]-carotene and astaxanthin. The analyses revealed that oxidative degradation and peroxidation of [alpha]-linolenic acid, as evaluated by the amount of malondialdehyde and conjugated diene formed, respectively, increased in a dose-dependent manner. Moreover, 8.5x10.sup.-3 M [beta]-carotene inhibited gamma radiation-induced oxidative degradation of [alpha]-linolenic acid, whereas 5.0x10.sup.-5 and 5.0x10.sup.-6 M [beta]-carotene, and 5.0x10.sup.-7 and 5.0x10.sup.-8 M astaxanthin promoted degradation. In contrast, neither [beta]-carotene nor astaxanthin affected peroxidation of [alpha]-linolenic acid. These results suggest that an optimum concentration of carotenoids in radioresistant bacteria protects biological lipid structures from radiation-induced damage. Author Affiliation: Research Reactor Institute, Kyoto University, 2-1010, Asashironishi, Kumatori, Sennan, Osaka 590-0494, Japan Article History: Received 3 October 2013; Accepted 11 January 2014
    Keywords: Linolenic Acids -- Analysis ; Nuclear Radiation -- Analysis ; Beta Carotene -- Analysis ; Bacteria -- Analysis ; Omega 3 Fatty Acids -- Analysis ; Gamma Rays -- Analysis
    ISSN: 0969-806X
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Materials Science & Engineering A, July 15, 2014, Vol.609, p.72(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.msea.2014.04.094 Byline: Takeshi Saito, Calin D. Marioara, Jostein Royset, Knut Marthinsen, Randi Holmestad Abstract: The effects of quench rate after solution heat treatment in combination with 1% pre-deformation on precipitation hardening in three Al-Mg-Si alloys have been investigated by transmission electron microscopy and hardness measurements during an isothermal heat treatment. The alloys contain different Cu amounts (up to 0.1wt%) and the same amounts of other solute elements. While a Cu amount below 0.01wt% does not affect precipitation hardening, an addition of 0.1wt% Cu increases hardness due to the formation of a fine microstructure having a high number density of short precipitates. A double peak hardness evolution was observed during isothermal heat treatment. This effect was most pronounced for alloys with low quench rate, and less pronounced for alloys with 1% pre-deformation and 0.1wt% Cu addition. The low quench rate also led to wider precipitation free zones. This effect was also less pronounced by 1% pre-deformation and addition of 0.1wt% Cu. Author Affiliation: (a) Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway (b) SINTEF Materials and Chemistry, N-7465 Trondheim, Norway (c) Hydro Aluminum Research and Technology Development, N-6601 Sunndalsora, Norway (d) Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway Article History: Received 14 March 2014; Revised 17 April 2014; Accepted 25 April 2014
    Keywords: Alloys ; Hardness (Materials) ; Interest Rates ; Electron Microscopy ; Rain
    ISSN: 0921-5093
    Source: Cengage Learning, Inc.
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  • 9
    Article
    Article
    Language: English
    In: Gastroenterology, July 2017, Vol.153(1), pp.328-329
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1053/j.gastro.2017.05.054 Byline: Jonas F. Ludvigsson Author Affiliation: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm and Department of Pediatrics, Orebro University Hospital, Orebro, Sweden and Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK and Celiac Disease Center, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York
    Keywords: Medicine
    ISSN: 0016-5085
    E-ISSN: 1528-0012
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  • 10
    Language: English
    In: Carbon, November 2012, Vol.50(13), pp.4932-4938
    Description: The electrochemical capability of single-wall carbon nanotube (SWCNT) electrodes is investigated to establish their reliability in practical applications. Direct current (DC) voltage of +10 V is applied across the SWCNT anode and Pt cathode in water, and the electrochemical fracturing behavior of SWCNTs is analyzed using transmission electron microscopy and atomic force microscopy. A considerable number of short SWCNTs, with lengths of less than 200 nm, are observed to be electrochemically generated. This result suggests that the anodic corrosion of SWCNTs occurs even in water, a non-electrolyte liquid. Raman spectroscopy and a comparison study of the anodization behavior of SWCNTs with narrow (0.9 nm) and wide (1.8 nm) diameters indicate that the durability of narrow SWCNTs is lower than that of the wide SWCNTs.
    Keywords: Chemistry
    ISSN: 0008-6223
    E-ISSN: 1873-3891
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