ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999  (96)
  • 1945-1949
  • 1930-1934
  • 1998  (96)
Collection
Years
  • 1995-1999  (96)
  • 1945-1949
  • 1930-1934
Year
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3906-3910 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photocurrent transient of a-Si(C):H n-i-p-i-n/p-i-n-i-p color detectors under pulse illumination at different wavelengths has been investigated. In contrast to amorphous silicon Schottky diodes and p-i-n/n-i-p structures, the photocurrent decay after the end of the steady state illumination is barely influenced by the applied bias voltage. Moreover, a reversal of the photocurrent direction can be observed under certain bias when the light is being switched on. It is suggested that these properties of n-i-p-i-n/p-i-n-i-p structures are mainly attributed to the accumulation and trapping of the photogenerated carriers near the central barrier. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2618-2620 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectrally resolved photoresistance investigations of charge storage effects in self-assembled InAs quantum dots (QDs) are reported. Resonant optical excitation of the QDs produces a strong increase of the lateral resistance of a spatially separated electron channel (ΔR) which reflects the stored charge density. This photoresponse is persistent for many hours at 145 K and can be controllably reversed electrically. Pronounced oscillations observed in the spectral variation ΔR are shown to reflect the excitation spectrum of the QD ensemble showing resonances that arise from both direct and phonon-assisted absorption processes. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 299-300 (Dec. 1998), p. 165-170 
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Inventiones mathematicae 134 (1998), S. 145-176 
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 184 (1998), S. 231-247 
    ISSN: 1573-4919
    Keywords: mitochondria ; compartmentation ; myofilaments ; contraction ; ATPase ; translocase ; ventricle ; atria ; calcium sensitivity ; oxygen consumption ; oxidative capacity ; creatine ; rigor tension ; active tension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Creatine kinase (CK) isoenzymes are present in all vertebrates. An important property of the creatine kinase system is that its total activity, its isoform distribution, and the concentration of guanidino substrates are highly variable among species and tissues. In the highly organized structure of adult muscles, it has been shown that specific CK isoenzymes are bound to intracellular compartments, and are functionally coupled to enzymes and transport systems involved in energy production and utilization. It is however, not established whether functional coupling and intracellular compartmentation are present in all vertebrates. Furthermore, these characteristics seem to be different among different muscle types within a given species. This study will review some of these aspects. It has been observed that: (1) In heart ventricle, CK compartmentation and coupling characterize adult mammalian cells. It is almost absent in frogs, and is weakly present in birds. (2) Efficient coupling of MM-CK to myosin ATPase is seen in adult mammalian striated muscles but not in frog and bird heart where B-CK is expressed instead of M-CK. Thus, the functional efficacy of bound MM-CK to regulate adenine nucleotide turnover within the myofibrillar compartment seems to be specific for muscles expressing M-CK as an integral part of the sarcomere. (3) Mi-CK expression and/or functional coupling are highly tissue and species specific; moreover, they are subject to short term and long term adaptations, and are present late in development. The mitochondrial form of CK (mi-CK) can function in two modes depending on the tissue: (i) in an ≪ADP regeneration mode≫ and (ii) in an ≪ADP amplification mode≫. The mode of action of mi-CK seems to be related to its precise localization within the mitochondrial intermembrane space, whereas its amount might control the quantitative aspects of the coupling. Mi-CK is highly plastic, making it a strong candidate for fine regulation of excitation-contraction coupling in muscles and for energy transfer in cells with large and fluctuating energy demands in general. (4) Although CK isoforms show a binding specificity, the presence of a given isoform within a tissue or a species only, does not predict its functional role. For example, M-CK is expressed before it is functionally compartmentalized within myofibrils during development. Similarly, the presence of ubiquitous or sarcomeric mi-CK isoforms, is not an index of functional coupling of mi-CK to oxidative phosphorylation. (5) Amongst species or muscles, it appears that a large buffering action of the CK system is associated with rapid contraction and high glycolytic activity. On the other hand, an oxidative metabolism is associated with isoform diversity, increased compartmentation, a subsequent low buffering action and efficient phosphotransfer between mitochondria and energy utilization sites. It can be concluded that, in addition to a high variation of total activity and isoform expression, the role of the CK system also critically depends on its intracellular organization and interaction with energy producing and utilizing pathways. This compartmentation will determine the high cellular efficiency and fine specialization of highly organized and differentiated muscle cells.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of computer aided molecular design 12 (1998), S. 309-309 
    ISSN: 1573-4951
    Keywords: de novo design ; protein–ligand interactions ; scoring functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A dataset of 82 protein–ligand complexes of known 3D structure and binding constant Ki was analysed to elucidate the important factors that determine the strength of protein–ligand interactions. The following parameters were investigated: the number and geometry of hydrogen bonds and ionic interactions between the protein and the ligand, the size of the lipophilic contact surface, the flexibility of the ligand, the electrostatic potential in the binding site, water molecules in the binding site, cavities along the protein–ligand interface and specific interactions between aromatic rings. Based on these parameters, a new empirical scoring function is presented that estimates the free energy of binding for a protein–ligand complex of known 3D structure. The function distinguishes between buried and solvent accessible hydrogen bonds. It tolerates deviations in the hydrogen bond geometry of up to 0.25 Å in the length and up to 30 °Cs in the hydrogen bond angle without penalizing the score. The new energy function reproduces the binding constants (ranging from 3.7 × 10-2 M to 1 × 10-14 M, corresponding to binding energies between -8 and -80 kJ/mol) of the dataset with a standard deviation of 7.3 kJ/mol corresponding to 1.3 orders of magnitude in binding affinity. The function can be evaluated very fast and is therefore also suitable for the application in a 3D database search or de novo ligand design program such as LUDI. The physical significance of the individual contributions is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell reports 17 (1998), S. 415-421 
    ISSN: 1432-203X
    Keywords: Key words RAPD-PCR ; DNA-sequencing ; Vitis vinifera L. ; retrotransposon-like sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When assaying for sequence heterogeneity within monomorphic RAPD-PCR products in grapevines (Vitis spp.), we observed partial digestibility of a marker with the restriction enzyme MspI. The degree of digestion varied reproducibly between different cultivars. To study this phenomenon, two of the amplification products were cloned and sequenced. They show 91.7% similarity to each other. The DNA analysed was found to possess high similarity to retrotransposons from higher plants. This element seems repetitive and dispersed throughout the genome. To our knowledge, this is the first report of retrotransposon-like elements in woody plants.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 14 (1998), S. 488-496 
    ISSN: 1432-2315
    Keywords: Key words: Texture mapping ; Procedural texture ; Texture control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Annals of software engineering 6 (1998), S. 295-321 
    ISSN: 1573-7489
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We have been applying the stakeholder win–win approach to software engineering education. The key stakeholders we are trying to simultaneously satisfy are the students; the industry recipients of our graduates; the software engineering community as parties interested in improved practices; and ourselves as instructors and teaching assistants. In order to satisfy the objectives or win conditions of these stakeholders, we have formed a strategic alliance with the USC Libraries to have software engineering student teams work with Library clients to define, develop, and transition USC digital library applications into operational use. This adds another set of key stakeholders: the Library clients of our class projects. This paper summarizes our experience in developing, conducting, and iterating the course. It concludes by evaluating the degree to which we have been able to meet the stakeholder-determined course objectives.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0044-264X
    Keywords: Key words Flavonoids – flavonols – flavones – anthocyanins – bioavailability – antioxidative effects – prevention ; Schlüsselwörter Flavonoide – Flavonole – Flavone – Anthocyane – Bioverfügbarkeit – antioxidative Wirkungen – Prävention ; Abkürzungen DNA = Desoxyribonucleinsäure – LDL = Low-density lipoprotein – HPLC = Hochdruckflüssigchromatografie – IC = Inhibitory concentration – ROS = Reaktive Sauerstoffspezies – SD = Standardabweichung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Flavonoide sind nichtnutritive Pflanzenstoffe, deren Eigenschaften in den letzten Jahren hinsichtlich möglicher protektiver Einflüsse auf chronische Erkrankungen intensiv untersucht wurden. So konnte für Flavonole, Flavone und neuerdings auch Anthocyane in vitro eine teilweise erhebliche antioxidative Aktivität, die vor allem im Abfangen freier Sauerstoffradikale besteht, nachgewiesen werden. In europäischem Obst und Gemüse sind besonders Flavonole, aber auch Anthocyane weit verbreitet. Erhebliche Mengen beider Flavonoide können auch in schwarzem Tee und Rotwein enthalten sein. Diese Lebensmittel stellen mit unterschiedlichen Anteilen die wichtigsten Quellen für die Aufnahme von Flavonolen dar. Während die Absorption der Aglykone seit längerem nachgewiesen ist, konnten erst jüngste Untersuchungen die Absorption von Flavonolglykosiden aus dem Dünndarm belegen. Die durchschnittliche Aufnahme von Flavonolen in der bundesdeutschen Bevölkerung wurde anhand der Daten der Nationalen Verzehrsstudie ermittelt. Sie betrug etwa 11,5 mg pro Person und Tag und stammte überwiegend aus Obst und Gemüse, aber auch aus Tee und Rotwein. In epidemiologischen Studien wurde untersucht, ob die Höhe der Flavonolaufnahme mit dem Auftreten bestimmter Erkrankungen assoziiert ist. Es konnte gezeigt werden, daß ein inverses Verhältnis zwischen tödlich verlaufenden Herzinfarkten und dem Umfang der Flavonolaufnahme besteht. Eine inverse Beziehung von Flavonoidaufnahme und dem Risiko von Krebserkrankungen ließ sich bisher in einer von drei Studien nachweisen. Diese Übersicht stellt den aktuellen Wissensstand über Vorkommen, alimentäre Aufnahme, Bioverfügbarkeit und antioxidative Eigenschaften von Flavonolen, Flavonen und Anthocyanen sowie die mit der Flavonoidaufnahme verbundenen Krankheitsrisiken dar. Die möglichen gesundheitlichen Effekte, besonders von Flavonolen, werden vor diesem Hintergrund kritisch beleuchtet und der daraus resultierende Forschungsbedarf genannt.
    Notes: Summary Flavonoids are non-nutritive compounds of plants that have been intensively investigated during the past years due to their possible protective effects against chronic diseases. In vitro studies were able to demonstrate for flavonols, flavones, and most recently also for anthocyanins a considerable antioxidative activity, mainly based on scavenging of oxygen radicals. Flavonols and anthocyanins are commonly found in European fruits and vegetables. In addition, black tea and red wine may have a high content of these compounds. Those food items are the main sources of flavonol consumption each contributing to a different degree to the overall intake. The absorption of a aglycones has been established before. However, only recently could the absorption of flavonolglycosides be demonstrated. The mean intake of flavonols of the German population was calculated using data from the National German Food Consumption Survey. According to this analysis, the daily per capita intake was about 11.5 mg flavonols, mainly derived from fruits and vegetables, but also from black tea and red wine. Epidemiological studies have been directed to investigate the association between flavonol consumption and disease risk. An inverse association between flavonol intake and mortality from myocardial infarction was observed. According to one of three studies, the flavonoid intake can be inversely correlated with cancer risk. This review summarizes the current knowledge on the occurrence, intake, bioavailability, and antioxidative properties of flavonols, flavones, and anthocyanins as well as the associations between flavonol intake and disease risks. Possible health related effects especially of flavonols are critically reflected, and the necessity of further research is outlined.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...