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  • 1
    Online Resource
    Online Resource
    Singapore :Springer Nature Singapore :
    Keywords: Human physiology. ; Neurosciences. ; Biochemistry. ; Human Physiology. ; Neuroscience. ; Biochemistry.
    Description / Table of Contents: 1 Introduction -- 2 Synthesis and Metabolism of Gut Dopamine -- 3 Dopamine Receptors in the Gastrointestinal Tract -- 4 Dopamine and Gastrointestinal Mucosa Function -- 5 Dopamine and Gastrointestinal Mobility -- 6 Dopamine in the Pancreas. .
    Abstract: Dopamine is widely present in the central and peripheral nervous systems, as well as in non-nervous systems. Parkinson's disease is well recognized as a dopaminergic neurodegenerative disorder, and affected patients often show early signs of gastrointestinal disorders at initial stages of the disease. Apart from the changes that occur in emotion, movement behaviors, learning and memory, metabolism etc., dopamine has also been demonstrated to play very crucial roles in the functional regulation of peripheral organs such as the heart, blood vessels, kidneys, and gut. Most recently, dopamine function in the gut has received enormous attention. Not only does dopamine regulate gut motility, ion transport, and mucosal barrier, but it is becoming more pertinent that more than 60% of dopamine in the body stems from the gut, which has not yet been properly addressed and substantially explored. Therefore, this book will discuss the brain-gut axis by providing novel and significant insight into the essence of gut-derived dopamine in mammals. It aims to inspire further research on dopaminergic regulation of gut function and disease genesis.
    Type of Medium: Online Resource
    Pages: V, 232 p. 101 illus., 56 illus. in color. , online resource.
    Edition: 1st ed. 2021.
    ISBN: 9789813365865
    DDC: 612
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 201-204 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 115-120 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ultrasonic attenuation properties of two kinds of pored Al alloy were studied between1MHz and 10MHz.. The results show that the ultrasonic attenuation properties are determined bythe pore structures of Al alloy. Ultrasonic attenuation coefficient α in porous Al alloy increaseswith decreasing of pore diameter d, decreasing of porosity Ps , and increasing of specific surfacearea Sv. However the α in cellular Al alloy increases with decreasing pore diameter d, increasingporosity Ps and increasing specific surface area Sv. Ultrasonic attenuation property of cellular Alalloy is better than that of porous Al alloy when they have the similar pore diameter d andporosity Ps. The origin for different attenuation properties is discussed in these materials
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 4187-4190 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Under high impact energy, nano-structured surface layers of Hadfield steel and annealed AISI 1045 steel were investigated in the present paper. It has been observed that a so-called “black layer” for Hadfield steel and “white layer” for AISI 1045 steel has been formed, respectively. That definitely will give rise to a change of wear mechanism. The wear tests showed that the wear weightloss curve of Hadfield steel will be bent down after some critical impact numbers. The wear curve of the AISI 1045 steel, however, shows a step-like characteristic with increasing impact numbers. It can be found from microstructural examination that high density twin bands of subsurface for Hadfield steel were produced, which have good plastic deformation coordination with bulk material. Cracks are usually initiated in the “black layer” underneath 12 µm in depth, and the worn debrissizes were also observed in nano-scale. Nano scaled wear controls the whole wear process. For the annealed AISI 1045 steel, cracks are mainly initiated between the interface of the “white layer” and sub-surface deformation layer. Debris is in micron-scale and spalled in the flake-like style. The wear weight loss is, therefore, greater than that of Hadfield steel. The result showed from the wear tests of Hadfield steel and AISI 1045 steel that nanocrystalized process of subsurface becomes one of control factors to affect wear losses and wear mechanism under high impact energy
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 117-120 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It has been well known that Hadfield steel behaviors excellent wear resistance under high impact energy. Up to now there exist many theories to explain the wear mechanism of Hadfield steel. In this research subsurface microstructure evolution process of Hadfield steel was investigated after high energy impact experiments. It was shown from high resolution electron microscope (HRTEM) examination of subsurface microstructure that nanocrystallized austenite grains have been formed in the procedure of the reaction and rearrangement of high density dislocations under the heavy plastic deformation, sub-grains as a transitional structure and, finally, the formation of nano austenite grains. On the other side, the interactions of twins and stack faults or dislocations and stack faults make austenite crystals transform to amorphous solid. With increasing impact cycles the sizes of nano-grains were decreased and the amorphous volumes were increased further. Alarge amount of nano-sized grains embedded in bulk amorphous matrix were fully developed, which will dominate the wear of the steel. In the subsurface no martensitic transformation was observed
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 3855-3858 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructure in anchoring site of Pt/Ti explosive clad Plate was observed, tested and analyzed by analytical and high resolution transmission electron microscope, X-ray diffractometer, scanning electron microscope and energy-dispersive spectrometer. An intermittent micro-crystal layer was observed in anchoring area, with thickness of 2 um. The inner crystal size was from some nanometer. to hundreds of nanometer. Some crystal had defects in it, such as staggered layer. The layer was composed of metal compound, like PtTi,Pt5Ti3,Pt3Ti,Ti3Pt and etc. The direct Pt—Ti anchoring area, hexagonal Ti variation-orthorhombic crystal system, α″-Ti metastable martensite phase and bicrystals with partial deformation were also observed. The research of microstructure in anchoring area revealed the nature of explosive compound in metallurgical anchoring
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 229 (1995), S. 317-323 
    ISSN: 1572-946X
    Keywords: active galaxies ; Seyferts ; spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report our discovery of new active galaxies in a small sample of 23 sources with 2.16 m telescope at Beijing Astronomical Observatory. After wavelength and flux calibration, they are classified by their degree of nuclear activities: one Seyfert 1, three Seyfert 2s, six Seyfert 3s, Seven HII galaxies and one possible Seyfert 3.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 321 (1985), S. 72-76 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method for the determination of nickel in urine and other biological samples by graphite furnace AAS has been developed and employed for clinical applications. This method offers several advantages: The digestion of the samples with nitric and perchloric acids is time-saving, nickel is precipitated with ammonium pyrrolidine dithiocarbamate over a wide range of acidity and Ni-PDC in MIBK is fairly stable for one week. The coefficient of variation from run-to-run is 7.3% based on analyses of the same urine specimen containing 1.2 μg/l of nickel on 9 successive working days, and the coefficient of variation within a single run is 4.7% based on 8 analyses of a single urine specimen containing 1.3 μg/l of nickel within the same day. A good agreement is obtained with the certified values when the method is applied to the determination of nickel in biological standard reference materials.
    Notes: Zusammenfassung Das Verfahren, das für klinische Anwendung entwickelt wurde, bietet mehrere Vorteile: der Aufschluß der Proben mit Salpeter- und Perchlorsäure ist zeitsparend, Nickel kann mit Ammoniumpyrrolidindithiocarbamat in einem weiten pH-Bereich gefällt werden und Ni-PDC in MIBK ist eine Woche lang stabil. Der Variationskoeffizient beträgt 7,3% für 1,2 μg Ni/l über 9 Arbeitstage, für 8 Analysen mit 1,3 μg Ni/l innerhalb eines Arbeitstages beträgt er 4,7%. Bei der Analyse von Standardreferenzmaterialien wurde gute Übereinstimmung mit den zertifizierten Werten festgestellt.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 56 (1995), S. 81-89 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quasi-one-dimensional periodic systems were investigated by the new proposed extrapolation method. The effect of the selection of the different structural units and their spin states on the periodic system was also studied. A quantum chemical calculation investigation of a 28 quasi-one-dimensional periodic system with MNDO (UHF) and EHMO/ASED-EHCO/ASED was undertaken. Quantum chemical calculation results with the MNDO (UHF) method showed that the proposed new method could be applied in the situation of the more precise semiempirical method. The selection of the different structural units and their spin states do not affect the extrapolated structural unit energy. The energy of suspending terminal group is generally higher for those with a higher bond order. The interaction energy between the suspending terminal groups generally decreases with the chain length. Comparison between the extrapolation results of EHMO/ASED and those from the crystal orbital calculation of EHCO/ASED indicates their equivalence, thus confirming the validity of the proposed method. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 37 (1995), S. 105-111 
    ISSN: 0959-8103
    Keywords: interfacial effect ; rheological behavior ; high-density polyethylene ; ethylene propylene diene rubber ; carbon black ; composite ; 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: Investigation of the effects of an interfacial modifier on the rheological behavior of binary high-density polyethylene (HDPE) composites showed that the interfacial modifier significantly changed the melt state behavior of HDPE/carbon black (CB) composites. This suggests that the interfacial adhesion between the CB surface and the HDPE is significantly improved by the incorporation of the interfacial modifier. Although the dispersion of filler in the matrix was improved, HDPE was also temporarily crosslinked by the CB Particles in the melt due to the strong interfacial interaction.For HDPE/ethylene propylene diene rubber (EPDM) composites, incorporation of CB caused limited change of the melt state behavior. Addition of interfacial modifier to the HDPE/EPDM/CB composite also resulted in a change of the melt state behavior compared with the unmodified composite, but the effect was not so pronouced as that in the HDPE/CB composites. The difference is well explained by the different phase structure. A core-shell dispersed phase structure with the filler as a core and rubber as a shell was formed in the modified composite, with the crosslinking effect predominating in the dispersed phase, while a separate filler and rubber dispersed phase predominated in the unmodified composite. The conclusion is further supported by the solid state dynamic mechanical analysis in a previous paper and SEM micrographs in this paper.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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