ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Wiley-Blackwell  (93.174)
  • Dordrecht : Springer
  • 2005-2009  (81)
  • 1980-1984  (43.083)
  • 1975-1979  (36.058)
  • 1950-1954  (9.876)
  • 1945-1949  (4.111)
Sammlung
Sprache
Erscheinungszeitraum
Jahr
  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Dazugehörige Bände
    Signatur: 5/M 07.0075
    In: Modern approaches in geophysics
    Materialart: Monographie ausleihbar
    Seiten: XII, 268 Seiten , Diagramme , 1 CD-ROM
    Ausgabe: 2nd edition
    ISBN: 0792368347
    Serie: Modern approaches in geophysics 15
    Sprache: Englisch
    Anmerkung: Contents: 1. Introduction. 2. RC Filter. 3. General linear time invariant systems. 4. The seismometer. 5. The sampling process. 6. Analog-to-digital conversion. 7. From infinitely continuous to finite discrete. 8. The digital anti-alias filter. 9. Inverse and simulation filtering of digital seismograms. 10. The measurement of wavelet parameters from digital seismograms. References. Appendix: Solution to problems.
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Signatur: 8/M 07.0139
    In: NATO science series
    Beschreibung / Inhaltsverzeichnis: Contents: Part 1: Introduction. - Part 2: Analysis Of Initial Rock Slope Failure.- Part 3: Monitoring Of Rock Slope Movement. .- Part 4: Analysis Of Post-Failure Behaviour..- Part 5: Case Studies Of Massive Rock Slope Failure.- Part 6: Volcanic Landslides. - Part 7: Regional Studies Of Massive Rock Slope Failure. - Part 8: Influences On Geomorphological Evolution. - Part 9: State-Of-The-Art.
    Materialart: Monographie ausleihbar
    Seiten: xv, 662 S. , 24cm
    ISBN: 1402040369
    Serie: NATO science series : Series IV, Earth and environmental series 49
    Klassifikation:
    B..
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Signatur: M 07.0079
    Beschreibung / Inhaltsverzeichnis: Acoustic remote sensing of the ocean environment has seen a remarkable progress in the last ten-fifteen year as a result of an increasing understanding of the experimental techniques and procedures and of the subtleties of the interaction of sound with complex physical and biological processes. This is particularly true in the shallow water environment, where acoustic methods have the potential to allow for a fast and accurate characterization and assessment of the environment. To review the state of the art and the research progress in the field, a workshop was held in the island of Ischia, Italy, in June 2004. Special emphasis has been placed on the experimental applications, to realistically assess their potential and capabilities of the methods proposed.
    Materialart: Monographie ausleihbar
    Seiten: XII, 332 S. + 1 CD-ROM , Ill., graph. Darst. , 1 CD-ROM
    ISBN: 1402043724
    Klassifikation:
    Photogrammetrie, Fernerkundung
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK N 322-07-0095
    Materialart: Monographie ausleihbar
    Seiten: XVII, 495 S.
    ISBN: 1402049676
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Signatur: 20-1/M 07.0281
    In: Water science and technology library
    Beschreibung / Inhaltsverzeichnis: Contents: 1 UNIVARIATE EXTREME VALUE THEORY 1.1 Order Statistics 1.2 Extreme value theory 1.3 Hazard, return period, and risk 1.4 Natural Hazards 2 MULTIVARIATE EXTREME VALUE THEORY 2.1 Multivariate Extreme Value Distributions 2.2 Characterizations of the domain of attraction 2.3 Multivariate dependence 2.4 Multivariate return periods 3 BIVARIATE ANALYSIS VIA COPULAS 3.1 2-Copulas 3.2 Archimedean copulas 3.3 Return periods via copulas 3.4 Tail dependence 4 MULTIVARIATE ANALYSIS VIA COPULAS 4.1 Multivariate copulas 4.2 Archimedean copulas 4.3 Conditional mixtures 5 EXTREME VALUE ANALYSIS VIA COPULAS 5.1 Extreme Value copulas 5.2 Dependence function 5.3 Tail dependence.
    Materialart: Monographie ausleihbar
    Seiten: 300 S.
    ISBN: 9781402044144
    Serie: Water science and technology library 56
    Klassifikation:
    B..
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: 15/M 07.0316 ; M 09.0066
    Beschreibung / Inhaltsverzeichnis: Contents: 1. An overview of Well Logging.- 2. Introduction to Well Log Interpretation.- 3. Basic Resistivity and Spontaneous Potential.- 4. Empiricism: The Cornerstone of Interpretation.- 5. Resistivity: Electrode Devices and How They Evolved.- 6. Other Electrode and Toroid Devices.- 7. Resistivity: Induction Devices.- 8. Multi-array and Triaxial Induction Devices.- 9. Propagation Measurements.- 10. Basic Nuclear Physics for Logging Applications.- 11. Gamma Ray Devices.- 12. Gamma Ray Scattering and Absorption Measurements.- 13. Basic Neutron Physics for Logging Applications.- 14. Neutron Porosity Devices.- 15. Pulsed Neutron Devices and Spectroscopy.- 16. Nuclear Magnetic Logging.- 17. Introduction to Acoustic Logging.- 18. Acoustic Waves in Porous Rocks and Boreholes.- 19. Acoustic Logging Methods.- 20. High Angle and Horizontal Wells.- 21. Clay Quantification.- 22. Lithology and Porosity Estimation.- 23. Saturation and Permeability Estimation.
    Materialart: Monographie ausleihbar
    Seiten: XIX, 692 S. : Ill., graph. Darst.
    Ausgabe: 2nd [revised and enlarged] ed.
    ISBN: 1402037384 , 978-1-402-03738-2
    Klassifikation:
    Ingenieurgeophysik
    Standort: Lesesaal
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Signatur: 8/M 07.0367
    In: Advances in natural and technological hazards research
    Beschreibung / Inhaltsverzeichnis: Contents: Section I: Flood Risk Management Practice . - Decision-making for flood-threatened properties / I. Kelman . - The influence of floodplain compartmentalization on flood risk within the Rhine-Meuse delta / D. Alkema and H. Middelkoop . - OSIRIS : an example of citizen-oriented technology development in the area of dissemination of information on flood risk management / M. Erlich . - Evolving concepts in flood risk management: searching for a common language / K. de Bruijn, C. Green, C. Johnson and L. McFadden . - COMRISK : a transnational project of public authorities on coastal risk management / J.L.A. Hofstede . - Dike investigations using geophysical methods : Techniques for the future? / R. Morawetz, J. Schön, C. Wohlfart and M. Röck . - Section II: Flood Events and Impacts . - The environmental impact of flooding of the Dutch Delta-Metropole / L.C.P.M. Stuyt, J.E.A. Reinders, E.E. van der Hoek, E.G.M. Hermans, M. de Muinck Keizer and J. Icke . - Structural economic effects of large-scale inundation: A simulation of the Krimpen Dike breakage / M. Bockarjova, A.E. Steenge, A. Van der Veen . - A method to estimate loss of life caused by large-scale floods in the Netherlands / N.E.M. Asselman and S.N. Jonkman . - Automation of flood contingency plans: benefits and implementation experiences / J.-J.Flikweert, C. Coremans, K. de Gooijer, L. Wentholt . - Section III: Flood Analysis and Modelling . - The IMPACT European research project on flood propagation in urban areas: experimental and numerical modelling of the influence of buildings on the flow / S. Soares Frazao, F. Alcrudo, J. Mulet, B. Noël, G. Testa and Y. Zech . - Sustainable development and flood risk :Reducing uncertainty (Bristol city re-development case study) / M. Pinnell . - Flood risk mapping at the local scale: Concepts and challenges / B. Merz, A.H. Thieken and M. Gocht . - Flood modelling and the August 2002 flood in the Czech Republic / P. Sklenár, E. Zeman, J. Špatka and P. Tachecí . - Seasonal rainfall and flow trends within three catchments in South-West England / D. Han . - Propagation of discharge uncertainty in a flood damage model for the Meuse River / Y. Xu, M.J. Booij and A.E. Mynett . - A stochastic model for simulating long time series of river-mouth discharge and sediment load / R. Hoogendoorn and G.J. Weltje.- Section IV: Flood Forecasting . - Forecasting flash floods with an operational model: application in the south-east of France (Gard) / P.A. Ayral, S. Sauvagnargues-Lesage, S. Gay and F. Bressand . - Flood forecasting for the Upper and Middle Odra river basin / M. Butts, A. Dubicki, K. Stronska, G. Jørgensen, A. Nalberczynski, A. Lewandowski and T. van Kalken . - Flood forecasting in the Anglian Region: User-driven development towards forecasting flood risk / D.E. Cadman, D.A. Price and M.B. Butts . - Flood forecasting model selection: A structured approach / K.A. Tilford, K.J. Sene and R. Khatibi . - Numerical modelling in coastal flood forecasting and warning in England and Wales / K. Hu, and C. Wotherspoon . - Section V: Flood Risk Management Policy . - Reflections on the challenges of EU policy-making with view to flood risk management: actors, processes and the acquis communautaire / A.L. Vetere Arellano, A. de Roo and J.-P. Nordvik . - On the flood risk in the Netherlands / L.M. Bouwer and P. Vellinga . - Planning for river induced floods in urban areas: experiences and key issues for Sweden / D. Thorsteinsson, A. Semadeni-Davies and R. Larsson . - Interregional and transnational co-operation in river basins : chances to improve flood risk management? / B. Haupter, P. Heiland and J. Neumüller.
    Materialart: Monographie ausleihbar
    Seiten: xvi, 534 S.
    ISBN: 1402041993 , 978-1-4020-4199-0
    Serie: Advances in natural and technological hazards research 25
    Klassifikation:
    B..
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Signatur: M 08.0212
    Beschreibung / Inhaltsverzeichnis: Currently, a first generation of dedicated satellite missions for the precise mapping of the Earth's gravity field is in orbit (CHAMP, GRACE, and soon GOCE). The gravity data from these satellite missions provide us with very new information on the dynamics of planet Earth. In particular, on the mass distribution in the Earths interior, the entire water cycle (ocean circulation, ice mass balance, continental water masses, and atmosphere), and on changes in the mass distribution.The results are fascinating, but still rough with respect to spatial and temporal resolution. Technical progress in satellite-to-satellite tracking and in gravity gradiometry will allow more detailed results in the future. In this special issue, Earth scientists develop visions of future applications based on follow-on high-precision satellite gravimetry missions.
    Materialart: Monographie ausleihbar
    Seiten: 163 S. , graph. Darst., zahlr. Kt.
    ISBN: 0387297960 , 978-0-387-29796-5
    Klassifikation:
    Gravimetrie
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Signatur: AWI A2-07-0053
    In: Space sciences series of ISSI
    Materialart: Monographie ausleihbar
    Seiten: 472 S. : zahlr. Ill., graph. Darst.
    ISBN: 9780387483399 , 0-387-48339-X
    Serie: Space sciences series of ISSI 23
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: M 07.0327
    Beschreibung / Inhaltsverzeichnis: Contents: 1. LITHOFACIES AND TRANSPORT OF CLASTIC SEDIMENTS IN KARSTIC AQUIFERS, Rachel Bosch and William B. White.- 2. SEDIMENT AND SEDIMENT-ASSOCIATED CONTAMINANT TRANSPORT THROUGH KARST, Barbara J. Mahier et al. - 3. PALAEOMAGNETIC ANALYSIS OF SEDIMENTS ON THE BUCHAN CAVES, SOUTHEASTERN AUSTRALIA, PROVIDES A PRE-LATE PLEISTOCENE DATE FOR LANDSCAPE AND CLIMATE EVOLUTION, R. J. Musgrave and J. A. Webb - 4. PALEOMAGNETIC ANALYSIS OF A LONG-TERM SEDIMENT TRAP, KOOKEN CAVE, HUNTINGDON COUNTY, PENNSYLVANIA, USA, Ira D. Sasowsky et al. - 5. PROVENANCE O SUSPENDED SEDIMENT DISCHARGED FROM A KARST AQUIFER DETERMINED BY CLAY MINERALOGY F. Leo Lynch et al. - 6. READING VIRGINIA?S PALEOCLIMATE FROM THE GEOCHEMISTRY AND SEDIMENTOLOGY OF CLASTIC CAVE SEDIMENTS, Elizabeth P. Knapp e al. - 7. GLACIALLY-INFLUENCED SEDIMENT CYCLES IN THE LIME CREEK KARST, EAGLE COUNTY, COLORADO Paul A, Burger - 8. CAVE SEDIMENTS AND DENUDED CAVERNS IN THE LAKI RAVNIK, CLASSICAL KARST OF SLOVENIA, France uteri - 9. PALEOCLIMATE RECORDS FROM SPELEOTHEMS IN LIMESTONE CAVES, William B. White - 1O. URANIUM-SERIES DATING OF SPELEOTHEMS: CURRENT TECHNIQUES, LIMITS, & APPLICATIONS, Jeffrey A. Dorale et al. - 11. PALEOCLIMATE INFORMATION FROM SPELEOTHEMS: THE PRESENT AS A GUIDE TO THE PAST, Russell S. Harmon et al. - 12 INFLUENCE OF DEPOSITIONAL ENVIRONMENT ON DEVIL?S HOLE CALCITE MORPHOLOGY AND PETROLOGY, Peter T. Kolesar and Alan C. Riggs - 13. SPELEOTHEMS FROM THE HIGH-ALPINE SPANNAGEL CAVE, ZILLERTAL ALPS (AUSTRIA), Christoph Spotl et al. - 14. ISOTOPE STAGE II, THE SUPER-INTERGLACIAL, FROM A NORTH NORWEGIAN SPELEOTHEM, Stein-Erik Lauritzen and Joyce Lundberg. - 15. ESTABLISHING A SPELEOTHEM CHRONOLOGY FOR SOUTHWESTERN OREGON - CLIMATIC CONTROLS AND GROWTH MODELLING, Steven C. Turgeon and Joyce Lundberg. - 6. SILICATES IN CARBONATE SPELEOTHEMS, GUADALUPE MOUNTAINS, NEW MEXICO, U.S.A, Victor J. Polyak and Necip Güven. - 17. RELIQUIAE DILUVIANAE ALTER: LAST INTERGLACIAL FLOOD DEPOSITS IN THE CAVES OF THE WEST INDIES, Donald A. McFarlane and Joyce Lundberg.
    Materialart: Monographie ausleihbar
    Seiten: X, 329 S. , Ill., graph. Darst.
    Ausgabe: Rev. ed., repr. with corr.
    ISBN: 1402053266 , 978-1-402-05326-9
    Klassifikation:
    Historische Geologie
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 11
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK N 076-09-0157
    Beschreibung / Inhaltsverzeichnis: Contents: Climate variability, predictability and climate risks: a European perspective ; Climate variability-observations, reconstructions, and model simulations for the Atlantic-European and Alpine region from 1500-2100 AD ; Challenges posed by and approaches to the study of seasonal-to-decadal climate variability ; Global warming and the summertime evapotranspiration regime of the Alpine region ; Climate risks and their impact on agriculture and forests in Switzerland ; The couplin of optimal economic growth and climate dynamics ; Modeling endogenous learning and imperfect competition effects in climate change economics ; Economics of climate policy and collective decision making
    Materialart: Monographie ausleihbar
    Seiten: 162 S. : Ill., graph. Darst.
    ISBN: 140205713X , 978-1-402-05713-7
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 12
    Signatur: M 07.0080
    Beschreibung / Inhaltsverzeichnis: Contents: 1. Landscape ecological applications in man-influenced areas for linking man and nature systems.- 2. Spatial pattern analysis as a focus of landscape ecology to support evaluation of human impact on landscapes and diversity.- 3. Application of landscape ecology in long term ecological research.- 4. Ecological networks, from concept to implementation.- 5. Landscape changes in Japan based on national grid maps.- 6. Challenges faced when creating an evaluation method of biodiversity on an ecosystem level.- 7. Identification of the potential habitat for giant panda in the Wolong Nature Reserve by using landscape ecology methodology.- 8. Land use change from traditional to modern eras.- 9. Evaluation and planning of wildlife habitat in urban landscape.- 10. Landscape ecology for biodiversity.- 11. A higher-taxon approach with soil invertebrates to assessing habitat diversity in East Asian rural landscapes.- 12. Landscape ecological approach in oil palm land use planning and management for forest conservation in Malaysia.
    Materialart: Monographie ausleihbar
    Seiten: XXX, 530 S. , 1 farb. Ill.
    ISBN: 9781402054877 , 1-402-05487-4
    Klassifikation:
    Ökologie
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 13
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Dazugehörige Bände
    Signatur: AWI G5-02-0132-12
    In: Developments in paleoenvironmental research
    Beschreibung / Inhaltsverzeichnis: Contents: The environmental landscape of Lochnagar. - The environmental landscape of Lochnagar. - Anthropogenic impacts from atmospheric pollutant deposition. - Future impacts.
    Materialart: Monographie ausleihbar
    Seiten: XXX, 503 S. : graph. Darst, Ill.
    ISBN: 140203900X
    Serie: Developments in paleoenvironmental research 12
    Klassifikation:
    Historische Geologie
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 14
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: M 07.0423
    Beschreibung / Inhaltsverzeichnis: Contents: Rethinking Sustainability Editor's Introduction; Marco Keiner.-Sustainability Quo Vadis?.- Reflections on Sustainability, Population Growth, and the Environment 2006; Albert A. Bartlett.- Sustainable Development Definitions, Principles, Policies; Herman E. Daly.- Sustainability is Not Enough; Peter Marcuse.-Challenges to Sustainable Development.- Sustainable Development and Urbanization; Marios Camhis.- Sustainable Economies Local or Global?; Helena Norberg-Hodge.- Business and Human Rights; Klaus M. Leisinger.-New approaches.- A New Glasnost for Global Sustainability; Mikhail Gorbachev.- Tools for the Transition to Sustainability; Dennis L. Meadows.- Factor Four and Sustainable Development in the Age of Globalization; Ernst Ulrich von Weizsäcker.- Ecological Footprint Accounting Comparing Earth's Biological Capacity with an Economy's Resource Demand; Mathis Wackernagel.- Advancing Sustainable Development and its Implementation Through Spatial Planning; Marco Keiner.- Sustainability is Dead Long Live Sustainability; Alan AtKisson.
    Materialart: Monographie ausleihbar
    Seiten: VIII, 257 S.
    ISBN: 1402047347 , 978-1-402-04734-3
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 15
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: 12/N 09.0018
    Beschreibung / Inhaltsverzeichnis: An entry point to the rapidly expanding field of paleoclimatology - the study of climates of the past. Highly interdisciplinary in nature, paleoclimatology integrates information from a broad array of disciplines in the geosciences.
    Materialart: Monographie ausleihbar
    Seiten: xxiv, 1047 S.
    ISBN: 9781402051975
    Serie: Encyclopedia of earth sciences series
    Klassifikation:
    Historische Geologie
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 16
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK N 456-05-0217 ; 12/N 05.0437
    Materialart: Monographie ausleihbar
    Seiten: Ill., graph. Darst.
    ISBN: 1402032641
    Serie: Encyclopedia of earth sciences series
    Klassifikation:
    Meteorologie und Klimatologie
    Standort: A 18 - Bitte bestellen
    Standort: Lesesaal
    Zweigbibliothek: PIK Bibliothek
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 17
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Dazugehörige Bände
    Signatur: AWI G5-02-0132-10 ; M 06.0575
    In: Developments in paleoenvironmental research
    Beschreibung / Inhaltsverzeichnis: Contents: Isotopes in Water. - Isotopes in tree rings. Isotopes in bones and teeth. Isotopes in lake sediments. Isotopes in speleothems. Isotopes in marine sediments.
    Materialart: Monographie ausleihbar
    Seiten: XVIII, 307 S.
    ISBN: 1402025033
    Serie: Developments in paleoenvironmental research 10
    Klassifikation:
    Meteorologie und Klimatologie
    Standort: AWI Lesesaal
    Standort: Kompaktmagazin oben
    Zweigbibliothek: AWI Bibliothek
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 18
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK B 160-10-0225
    Beschreibung / Inhaltsverzeichnis: Contents: Part I: Justifying Sustainability. ; 2. Intergenerational ethics under resource constraints ; 3. Justifying sustainability ; 4. Resolving distributional conflicts between generations ; 5. The malleability of undiscounted utilitarianism as a criterion of intergenerational justice ; 6. Rawlsian intergenerational justice as a Markov-perfect equilibrium in a resource technology ; 7. Unjust intergenerational allocations ; Part II: Characterizing Sustainability. ; 8. The Hartwick rule: Myths and facts ; 9. Hartwick's rule in open economies ; 10. Capital gains and 'net national product' in open economies ; 11. Characterizing sustainability: The converse of Hartwick's rule ; 12. On the sustainable program in Solow's model ; 13. Maximin, discounting, and separating hyperplanes ; Part III: Indicating Sustainability. ; 14. Green national accounting for welfare and sustainability: A taxonomy of assumptions and results ; 15. Net national product as an indicator of sustainability ; 16. Adjusting Green NNP to measure sustainability ; 17. Does NNP growth indicate welfare improvement? ; 18. A general approach to welfare measurement through national income accounting ; 19. Green national accounting with a changing population
    Materialart: Monographie ausleihbar
    Seiten: XII, 292 S. : graph. Darst.
    ISBN: 1402061994 , 978-1-402-06199-8
    Serie: Sustainability, economics, and natural resources 3
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 19
    Signatur: M 09.0459
    Beschreibung / Inhaltsverzeichnis: Contents: 1. Concepts of scale and scaling. 2. Perspectives, methods of scaling. 3. Uncertainty analysis in ecological studies. 4. Multilevel statistical models, ecological scaling. 5. Downscaling abundance from species distribution. 6. Scaling terrestrial biogeochemical processes. 7. A framework, methods for simplifying landscapes. 8. Building up with top-down approach. 9. Carbon fluxes across regions. 10. Landscape and regional scale studies of nitrogen gas fluxes. 11. Multiscale relationships of landscape characteristics and nitrogen concentrations in streams. 12. Uncertainty in scaling nutrient export coefficients. 13. Causes, consequences of land use change in North Carolina Piedmont. 14. Assessing spatial scale influence on relationship between avian nesting success and forest fragmentation. 15. Scaling issues in mapping riparian zones. 16. Scale issues in lake-watershed interaction. 17. Scaling, uncertainty in region-wide water quality decision-making. 18. Scaling with known uncertainty.
    Materialart: Monographie ausleihbar
    Seiten: xviii, 351 S. , graph. Darst., Kt.
    ISBN: 1402046642 , 978-1-402-04664-3
    Klassifikation:
    Ökologie
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 20
    Signatur: PIK N 454-14-0221
    Beschreibung / Inhaltsverzeichnis: Contents: Shift in thinking to address the 21st century hunger gap ; A grid-based assessment of global water scarcity including virtual water trading ; Water footprints of nations: Water use by people as a function of their consumption pattern ; Transitions towards adaptive management of water facing climate and global change ; Stakeholder-driven, enquiry-driven, or stakeholder-relevant, enquiry-driven science? ; Learning Alliances for the broad implementation of an integrated approach to multiple sources, multiple uses and multiple users of water ; Possibilities and problems with the use of models as a communication tool in water resource management ; Integration of the biophysical and social sciences using an indicator approach: Addressing water problems at different scales ; Capturing the complexity of water uses and water users within a multi-agent framework ; Upscaling field scale hydrology and water quality modelling to catchment scale ; Linking databases of different sources and scales for groundwater research in the Urema River Basin/Central Mozambique ; Integrated water and food analysis at the global and basin level. An application of WATERSIM ; The adaptive integrated data information system (AIDIS) for global water research ; Policy implications of a pan-tropic assessment of the simultaneous hydrological and biodiversity impacts of deforestation ; Towards better water security in North China ; Towards transition management of European water resources ; Some foci of integrated water resources management in the 'South' which are oft-forgotten by the 'North': A perspective from southern Africa ; The GLOWA Volta Project: A framework for water resources decision-making and scientific capacity building in a transnational West African basin ; Integrating a climate change assessment tool into stakeholder-driven water management decision-making processes in California ; Involving stakeholders in integrated river basin planning in England and Wales ; Integrated assessment of water resources: Australian experiences
    Materialart: Monographie ausleihbar
    Seiten: 373 S. : graph. Darst., Kt.
    ISBN: 9781402055904
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 21
    Signatur: M 06.0043
    In: Coastal Systems and Continental Margins
    Materialart: Monographie ausleihbar
    Seiten: XXI, 341 S. : graph. Darst. + 1 CD-ROM
    ISBN: 1402039719
    Serie: Coastal Systems and Continental Margins 9
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 22
    Signatur: 8/M 06.0038
    In: Geotechnical, geological and earthquake engineering
    Materialart: Monographie ausleihbar
    Seiten: XXV, 541 S. : Ill., graph. Darst. + 1 CD-ROM
    ISBN: 1402035241
    Serie: Geotechnical, geological and earthquake engineering 2
    Klassifikation:
    B..
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 23
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK N 071-06-0140
    Materialart: Monographie ausleihbar
    Seiten: XVI, 226 S. , graph. Darst.
    ISBN: 1402040628
    Serie: Environment & Policy 45
    Anmerkung: Erscheinungsjahr in Vorlageform:c 2006
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 24
    Signatur: M 05.0523 ; AWI G4-06-0009
    Materialart: Monographie ausleihbar
    Seiten: XV, 381 Seiten , Illustrationen
    ISBN: 140203010X , 1-4020-3010-X
    Klassifikation:
    Meteorologie und Klimatologie
    Sprache: Englisch
    Anmerkung: Contents Introduction 1. Isotope hydrology: a historical perspective / P.K. Aggarwal, K. Froehlich, R. Gonfiantini, J.R. Gat ISOTOPIC AND NUCLEAR METHODOLOGIES 2. Isotopic tracers for obtaining hydrologic parameters / H. Moser, W. Rauert 3. Hydrologic process studies using radionuclides produced by cosmic rays / D.Lal 4. Stable oxygen and hydrogen isotopes / L.L. Gourcy, M. Groening, P.K. Aggarwal 5. Tritium in the hydrologic cycle / R.L. Michel 6. Assessing sources and transformations of sulphate and nitrate in the hydrosphere using isotope techniques / B. Mayer 7. Rare gases / H.H. Loosli, R. Purtschert 8. U and Th series nuclides in natural waters / A. Kaufman 9. Optical isotope ratio measurements in hydrology / E.R.Th. Kerstel, H.A.J. Meijer HYDROLOGIC PROCESSES AND SYSTEMS 10. Some classical concepts of isotope hydrology / J.R. Gat 11. Istotopes in lake studies: a historical perspective / K.Froehlich, R. Gonfiantini, K. Rozanski 12. A review of isotope applications in catchment hydrology / T. Vitvar, P.K. Aggarwal, J.J. McDonnell 13. Contribution of isotopic and nuclear tracers to study of groundwaters / W.M. Edmunds 14. Dating of young groundwater / LN. Plummer 15. Dating of old groundwater - history, potential, limits and future / M.A. Geyh 16. Geotermal systems / Y.K. Kharaka, R.H. Mariner 17. Saline waters / J. Horita HYDROLOGIC PROCESSES AND SYSTEMS 18. Isotopes in atmospheric moisture / K. Rozanski 19. How much climatic information do water isotopes contain? / G. Hoffmann, M. Cuntz, J. Jouzel, M. Werner 20. Stable isotopes through the holocene as recorded in low-latitude, high-altitude ice cores / L.G. Thompson, M.E. Davis 21. Groundwater as an archive of climatic and environmental change / W.M. Edmunds 22. Isotopic palaeolimnology / F. Gasse Appendices A. List of seminal papers on isotope hydrology (the isotopes of hydrogen and oxygen) B. List of papers presented at the 1st IAEA Symposium on Isotope Hydrology (Tokyo, 1963) C. Excerpts from report of 1st IAEA Panel on the Application of Isotope Techniques in Hydrology
    Standort: Kompaktmagazin oben
    Standort: AWI Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 25
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: 2/N 05.0537
    Materialart: Monographie ausleihbar
    Seiten: xiii, 346 S.
    ISBN: 1402037139
    Serie: Information science and knowledge management 9
    Klassifikation:
    Wissenschaft
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 26
    Signatur: 8/M 06.0561
    In: NATO science series
    Materialart: Monographie ausleihbar
    Seiten: xii, 383 S.
    Ausgabe: 1. ed.
    ISBN: 1402049102
    Serie: NATO science series : IV, Earth and environment science 71
    Klassifikation:
    Hydrologie
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 27
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Dazugehörige Bände
    Signatur: 7/M 06.0558
    In: Remote sensing and digital image processing
    Beschreibung / Inhaltsverzeichnis: Contents: The Permanent Scatterer Technique.- The Integer Least-Squares Estimator.- The STUN Algorithm.- Synthetic Data Experiments.- Real Data Processing.- Conclusions and Recommendations.
    Materialart: Monographie ausleihbar
    Seiten: xvi, 211 S. , 73 schw.-w. Ill., 36 farb. Ill., 17 schw.-w. Tab., mit 1 CD-ROM
    ISBN: 140204576X
    Serie: Remote sensing and digital image processing 12
    Klassifikation:
    Photogrammetrie, Fernerkundung
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 28
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK N 319-16-89764
    Materialart: Monographie ausleihbar
    Seiten: IX, 242 S. , Ill., graph. Darst., Kt
    ISBN: 1402043317 , 9781402043314
    Sprache: Englisch
    Anmerkung: The Sun. The formation of the stars and the Sun ; The characteristics of the Sun ; A representation of the Sun ; The internal structure of the Sun ; The photosphere, solar radiation, the solar wind ; The thermal profile of the solar atmosphere ; Solar dynamics ; The Sun: the source of space weather -- The Earth. The Earth within the solar system ; The internal structure of the Earth : the geomagnetic field ; The atmosphere of the Earth ; The magnetosphere -- Toward a space weather. The consequences of solar agressions on our technological environment ; Other impacts of solar activity ; Space weather in order to forecast -- Appendices..
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 29
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: PIK B 020-20-94151
    Materialart: Monographie ausleihbar
    Seiten: XXV, 732 Seiten
    ISBN: 9781852333768 , 9781447125242
    Serie: Springer Finance
    Sprache: Englisch
    Anmerkung: Contents: Continuous Path Processes ; Continuous-Path Random Processes: Mathematical Prerequisites ; Basic Concepts and Examples in Finance ; Hitting Times: A Mix of Mathematics and Finance ; Complements on Brownian Motion ; Complements on Continuous Path Processes ; A Special Family of Diffusions: Bessel Processes ; Jump Processes ; Default Risk: An Enlargement of Filtration Approach ; Poisson Processes and Ruin Theory ; General Processes: Mathematical Facts ; Mixed Processes ; Lévy Processes
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 30
    Signatur: M 06.0581
    Beschreibung / Inhaltsverzeichnis: Contents: 1. Spectroscopic measurements of tropospheric composition from satellite measurements in the ultraviolet and visible: Steps toward continuous pollution monitoring from space. 2. ESA spectroscopy studies in support of spaceborne atmospheric composition sounding.- 3. The MIPAS experiment aboard ENVISAT: remote sensing of atmospheric composition.- 4. Performance of the operational retrieval code for MIPAS on ENVISAT and possible improvements of retrieval techniques for environment and climate.- 5. New measurements of trace species in the upper troposphere from infra-red spectra of the atmosphere.- 6. Remote sensing of the Non-LTE atmosphere.- 7. Quantitative spectroscopy and atmospheric measurements.- 8. Quantitative laboratory spectroscopy of atmospheric trace gases.- 9. Global modeling of high-resolution spectra of linear molecules CO2, N2O and C2H2.- 10. CDSD-296, the high-precision carbon dioxide spectroscopic databank: version for atmospheric applications.- 11. Theoretical quantitative spectroscopy: computer simulation of molecular spectra.- 12. Recent results on infrared molecular line broadening and shift parameters.- 13. Half-widths and line shifts of water vapor for atmospheric applications: measurement and theory.- 14. Quantitative rotational spectroscopy for atmospheric research.- 15. Pressure-broadening of the 22.2 GHz line of water: basic results for remote sensing of the atmosphere.- 16. Rotational spectroscopy at the Jet Propulsion Laboratory.- 17. Correlation between precipitable water and rainfall using Global Positioning System (GPS) technique.- 18. Extreme variability of aerosol optical properties: the Cairo aerosol characterization experiment case study.- 19. Urban air pollution and its photochemistry studied by laser spectroscopic.
    Materialart: Monographie ausleihbar
    Seiten: VII, 353 S.
    ISBN: 1402050895
    Serie: NATO security through science series : C, Environmental security
    Klassifikation:
    Photogrammetrie, Fernerkundung
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 31
    Signatur: IASS 16.90608
    Materialart: Monographie ausleihbar
    Seiten: XIX, 365 S , Ill., graph. Darst , 235 mm x 155 mm
    ISBN: 140208563X , 9781402085635 , 1402085648 , 9781402085642 , 9781402085659 (electronic)
    Serie: NATO science for peace and security series
    Sprache: Englisch
    Zweigbibliothek: RIFS Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 32
    Monographie ausleihbar
    Monographie ausleihbar
    Dordrecht : Springer
    Signatur: AWI S2-18-91494
    Beschreibung / Inhaltsverzeichnis: This book provides a compact self-contained introduction to the theory and application of Bayesian statistical methods. The book is accessible to readers having a basic familiarity with probability, yet allows more advanced readers to quickly grasp the principles underlying Bayesian theory and methods. The examples and computer code allow the reader to understand and implement basic Bayesian data analyses using standard statistical models and to extend the standard models to specialized data analysis situations. The book begins with fundamental notions such as probability, exchangeability and Bayes' rule, and ends with modern topics such as variable selection in regression, generalized linear mixed effects models, and semiparametric copula estimation. Numerous examples from the social, biological and physical sciences show how to implement these methodologies in practice. Monte Carlo summaries of posterior distributions play an important role in Bayesian data analysis. The open-source R statistical computing environment provides sufficient functionality to make Monte Carlo estimation very easy for a large number of statistical models and example R-code is provided throughout the text. Much of the example code can be run ``as is'' in R, and essentially all of it can be run after downloading the relevant datasets from the companion website for this book. Peter Hoff is an Associate Professor of Statistics and Biostatistics at the University of Washington. He has developed a variety of Bayesian methods for multivariate data, including covariance and copula estimation, cluster analysis, mixture modeling and social network analysis. He is on the editorial board of the Annals of Applied Statistics.
    Materialart: Monographie ausleihbar
    Seiten: IX, 270 Seiten , Illustrationen
    ISBN: 9780387922997 (GB.) , 9780387924076 (electronic)
    Serie: Springer texts in statistics
    Sprache: Englisch
    Anmerkung: Contents: 1 Introduction and examples. - 1.1 Introduction. - 1.2 Why Bayes?. - 1.2.1 Estimating the probability of a rare event. - 1.2.2 Building a predictive model. - 1.3 Where we are going. - 1.4 Discussion and further references. - 2 Belief, probability and exchangeability. - 2.1 Belief functions and probabilities. - 2.2 Events, partitions and Bayes' rule. - 2.3 Independence. - 2.4 Random variables. - 2.4.1 Discrete random variables. - 2.4.2 Continuous random variables. - 2.4.3 Descriptions of distributions. - 2.5 Joint distributions. - 2.6 Independent random variables. - 2.7 Exchangeability. - 2.8 de Finetti's theorem. - 2.9 Discussion and further references. - 3 One-parameter models. - 3.1 The binomial model. - 3.1.1 Inference for exchangeable binary data. - 3.1.2 Confidence regions. - 3.2 The Poisson model. - 3.2.1 Posterior inference . - 3.2.2 Example: Birth rates. - 3.3 Exponential families and conjugate priors. - 3.4 Discussion and further references. - 4 Monte Carlo approximation. - 4.1 The Monte Carlo method. - 4.2 Posterior inference for arbitrary functions. - 4.3 Sampling from predictive distributions. - 4.4 Posterior predictive model checking. - 4.5 Discussion and further references. - 5 The normal model. - 5.1 The normal model. - 5.2 Inference for the mean, conditional on the variance. - 5.3 Joint inference for the mean and variance. - 5.4 Bias, variance and mean squared error. - 5.5 Prior specification based on expectations. - 5.6 The normal model for non-normal data. - 5.7 Discussion and further references. - 6 Posterior approximation with the Gibbs sampler. - 6.1 A semiconjugate prior distribution. - 6.2 Discrete approximations. - 6.3 Sampling from the conditional distributions. - 6.4 Gibbs sampling. - 6.5 General properties of the Gibbs sampler. - 6.6 Introduction to MCMC diagnostics. - 6.7 Discussion and further references. - 7 The multivariate normal model. - 7.1 The multivariate normal density. - 7.2 A semiconjugate prior distribution for the mean. - 7.3 The inverse-Wishart distribution. - 7.4 Gibbs sampling of the mean and covariance. - 7.5 Missing data and imputation. - 7.6 Discussion and further references. - 8 Group comparisons and hierarchical modeling. - 8.1 Comparing two groups. - 8.2 Comparing multiple groups. - 8.2.1 Exchangeability and hierarchical models. - 8.3 The hierarchical normal model. - 8.3.1 Posterior inference. - 8.4 Example: Math scores in U.S. public schools. - 8.4.1 Prior distributions and posterior approximation. - 8.4.2 Posterior summaries and shrinkage. - 8.5 Hierarchical modeling of means and variances. - 8.5.1 Analysis of math score data. - 8.6 Discussion and further references. - 9 Linear regression. - 9.1 The linear regression model. - 9.1.1 Least squares estimation for the oxygen uptake data. - 9.2 Bayesian estimation for a regression model. - 9.2.1 A semiconjugate prior distribution. - 9.2.2 Default and weakly informative prior distributions. - 9.3 Model selection. - 9.3.1 Bayesian model comparison. - 9.3.2 Gibbs sampling and model averaging. - 9.4 Discussion and further references. - 10 Nonconjugate priors and Metropolis-Hastings algorithms. - 10.1 Generalized linear models. - 10.2 The Metropolis algorithm. - 10.3 The Metropolis algorithm for Poisson regression. - 10.4 Metropolis, Metropolis-Hastings and Gibbs. - 10.4.1 The Metropolis-Hastings algorithm. - 10.4.2 Why does the Metropolis-Hastings algorithm work?. - 10.5 Combining the Metropolis and Gibbs algorithms. - 10.5.1 A regression model with correlated errors. - 10.5.2 Analysis of the ice core data. -
    Standort: AWI Lesesaal
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 33
    Signatur: AWI Bio-16-90312
    In: Developments in Hydrobiology ; 197
    Beschreibung / Inhaltsverzeichnis: Ostracods, small aquatic Crustacea, occur in almost every marine, brackish and freshwater habitat. Their calcified bivalved carapaces readily fossilize and their record in earth history is long, dense and diverse. Ostracod species are particularly useful as tools in marine and limnic (palaeo-) ecology, in (palaeo-) biogeography, and biostratigraphy. Their reproductive morphology is as extraordinary as their reproductive modes, and many of their physiological peculiarities remain mysterious. Ostracod taxonomy and phylogeny contribute to general studies of crustacean evolution. The diversity of ostracod applications in both biology and palaeontology is clearly illustrated by the eighteen papers of the 15th International Symposium on Ostracoda (Berlin, Germany) in 2005, which are grouped in the present proceedings, one of three volumes resulting from this meeting.
    Materialart: Monographie ausleihbar
    Seiten: VI, 272 S , Ill., graph. Darst.
    Ausgabe: 1. ed.
    ISBN: 1402064179 (Gb.) , 9781402064173 (Gb.)
    Serie: Developments in Hydrobiology 197
    Sprache: Englisch
    Anmerkung: TABLE OF CONTENTS: Preface / R. Matzke-Karasz, M. Schudack, K. Martens. - REVIEW PAPER. - Ostracod recovery in the aftermath of the Permian-Triassic crisis: Palaeozoic-Mesozoic turnover / S. Crasquin-Soleau, T. Galfetti, H. Bucher, S. Kershaw, Q. Feng. - OSTRACOD TAXONOMY AND BIOGEOGRAPHY. - The influence of El Niño 1997-98 on pelagic ostracods in the Humboldt Current Ecosystem off Peru / R. Castillo, T. Antezana, P. Ayón. - A new, interstitial species of Terrestricythere (Crustacea: Ostracoda) and its microdistribution at Orito Beach, northeastern Sea of Japan / S. F. Hiruta, S.-i. Hiruta, S. F. Mawatari. - Non-marine Ostracoda (Crustacea) of Banat district in Serbia / T. Karan-Žnidaršič, B. Petrov. - ECOLOGICAL FACTORS AFFECTING OSTRACOD DISTRIBUTION. - A year round comparative study on the population structures of pelagic Ostracoda in Admiralty Bay (Southern Ocean) / K. Blachowiak-Samolyk, M.V. Angel. - Water quality and diversity of the Recent ostracod fauna in lowland springs from Lombardy (northern Italy) / V. Pieri, C. Caserini, S. Gomarasca, K. Martens, G. Rossetti. - Factors affecting spatial and temporal distribution of Ostracoda assemblages in different macrophyte habitats of a shallow lake (Lake Fehér, Hungary) / A. Kiss. - Groundwater Ostracods from the arid Pilbara region of northwestern Australia: distribution and water chemistry / J. M. Reeves, P. De Deckker, S. A. Halse. - Ecological requirements of Ostracoda (Crustacea) in a heavily polluted shallow lake, Lake Yeniçağa (Bolu, Turkey) / O. Külköylüoğlu, M. Dügel, M. Kılıç. - Food selection in Eucypris virens (Crustacea: Ostracoda) under experimental conditions / O. Schmit, G. Rossetti, J. Vandekerkhove, F. Mezquita. - EVOLUTIONARY SIGNIFICANCE OF OSTRACOD MORPHOLOGY. - Extra-lobal and complex dimorphic features in Middle Devonian palaeocopine ostracods / G. Becker, W. K. Braun. - Evolutionary and taxonomic aspects within the species group Pseudocandona eremita (Vejdovský) (Ostracoda, Candonidae) / S. lepure, T. Namiotko, D. L. Danielopol. - On the origin of the putative furca of the Ostracoda (Crustacea) / C. Meisch. - Ultrastructure of the carapace margin in the Ostracoda (Arthropoda: Crustacea) / S. Yamada. - Ultrastructure of hepatopancreas and its possible role as a hematopoietic organ in non-marine cypridoidean ostracods (Crustacea) / R. Symonova. - OSTRACOD REPRODUCTION AND ONTOGENY. - Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species / R. J. Smith, T. Kamiya. - Early release of eggs and embryos in a brooding ancient asexual ostracod: brood selection or a gambling strategy to increase fecundity? / R. L. Pinto, C. E. F. Rocha, K. Martens. - The ontogeny of appendages of Heterocypris salina (Brady, 1868) Ostracoda (Crustacea) / N. Kubanç, O. Özuluğ, C. Kubanç.
    Standort: AWI Lesesaal
    Zweigbibliothek: AWI Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 34
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1841-1846 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The conformational phase diagram of poly(L-lysine) (4.6 × 10-4 M, residue) in sodium dodecyl sulfate (1.6 × 10-2 M) solution was constructed from circular dichroism results at various temperatures and pH's. Poly(L-lysine)-sodium dodecyl sulfate complexes undergo a β-helix transition upon raising the pH of the solution. The transition pH tends to shift downward at elevated temperatures. No helix-β transition can be detected for poly(L-lysine) in sodium dodecyl sulfate solution (pH 〉 11) even after 1-hr heating at 70°C. This is in marked contrast with uncharged poly(L-lysine) solution without sodium dodecyl sulfate, which is converted into the β-form upon mild heating of the solution above 50°C.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 35
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1885-1903 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A normal coordinate analysis of V-amylose has been performed for an isolated 61 helical chain. Negligible splitting from interactions of vibrations of successive residues is expected between A and E vibrational species due to the large size of the monomer unit. As a result, calculation of only the totally symmetric A modes represents an adequate approximation to the vibrational spectrum of helical polysaccharides. Using this method together with a valence force field we have obtained good agreement between the observed and calculated frequencies. In addition, the computed potential energy distribution and Cartesian displacement coordinates match previous experimental assignments, based on deuterium exchange. The analysis also supports the proposed mechanism for conversion of V-amylose to the more extended B-form. This conversion results in an observed frequency shift for the Raman line at 946 cm-1 which is predicted by the calculations.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 36
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2025-2033 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The circular dichroism of Ac-(Ala)x-OMe and H-Lys-(Lys)x-OH with x = 1, 2, 3, and 4 has been measured in aqueous solutions. The oligomers with x = 4 show similar circular dichroism spectra in water when the lysyl amino groups are protonated, and they respond in similar fashion to heating and to sodium perchlorate. Both oligomers at 15°C exhibit a positive circular dichroism band at 217-218 nm, which is eliminated by the isothermal addition of 4 M sodium perchlorate or by heating. The positive circular dichroism of the lysine oligomer is also eliminated when the pH is elevated to deprotonate the amino groups. Positive circular dichroism is still observed for Ac-(Ala)4-OMe at elevated pH. Circular dichroism spectra have been estimated for poly(L-alanine) and poly(L-lysine) as statistical coils under the above conditions, based on the trends established with the oligomers. Poly(L-lysine) and poly(L-alanine) are predicted to exhibit similar circular dichroism behavior in aqueous solution so long as the lysyl amino groups are protonated. The circular dichroism of the statistical coil of poly(L-lysine), but not poly(L-alanine), is predicted to change when the pH is elevated sufficiently to deprotonate the lysyl amino groups. These results suggest that the unionized lysyl side chains participate in interactions that are not available to poly(L-alanine). Hydrophobic interactions may occur between the unionized lysyl side chains. Protonation of the lysyl amino groups is proposed to disrupt these interactions, causing poly(L-alanine) and protonated poly(L-lysine) to have similar circular dichroism properties.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 37
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis of nonapeptide hydrazide (sequence 93-101), [Thr107]-decapeptide (sequence 99-108), [Thr107]-tridecapeptide (sequence 96-108), [Thr107]-hexadecapeptide (sequence 93-108), [Thr107]-heptacosapeptide (sequence 82-108), and Nα-benzyloxycarbonyl-[Thr107]-dotetracontapeptide (sequence 67-108) of the proposed primary structure of baker's yeast iso-1-cytochrome c are described. Evidence is presented to indicate that these materials are sequentially homogeneous.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 38
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2115-2135 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Poly-β-benzyl-L-aspartate (poly[Asp(OBzl)]) forms either a lefthanded α-helix, β-sheet, ω-helix, or random coil under appropriate conditions. In this paper the Raman spectra of the above poly[Asp(OBzl)] conformations are compared. The Raman active amide I line shifts from 1663 cm-1 to 1679 cm-1 upon thermal conversion of poly[Asp(OBzl)] from the α-helical to β-sheet conformation while an intense line appearing at 890 cm-1 in the spectrum of the α-helix decreases in intensity. The 890 cm-1 line also displays weak intensity when the polymer is dissolved in chloroform-dichloroacetic acid solution and therefore is converted to the random coil. This line probably arises from a skeletal vibration and is expected to be conformationally sensitive. Similar behavior in the intensity of skeletal vibrations is discussed for other polypeptides undergoing conformational transitions.The Raman spectra of two cross-β-sheet copolypeptides, poly(Ala-Gly) and poly(Ser-Gly), are examined. These sequential polypeptides are model compounds for the crystalline regions of Bombyx mori silk fibroin which forms an extensive β-sheet structure. The amide I, III, and skeletal vibrations appeared in the Raman spectra of these polypeptides at the frequencies and intensities associated with β-sheet homopolypeptides. Since the sequential copolypeptides are intermediate in complexity between the homopolypeptides and the proteins, these results indicate that Raman structure-frequency correlations obtained from homopolypeptide studies can now be applied to protein spectra with greater confidence.The perturbation scheme developed by Krimm and Abe for explaining the frequency splitting of the amide I vibrations in β-sheet polyglycine is applied to poly(L-valine), poly-(Ala-Gly), poly(Ser-Gly), and poly[Asp(OBzl)]. The value of the “unperturbed” frequency, V0, for poly[Asp(OBzl)] was significantly greater than the corresponding values for the other polypeptides. A structural origin for this difference may be displacement of adjacent hydrogen-bonded chains relative to the standard β-sheet conformation.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 39
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975) 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 40
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Circular dichroism studies on synthetic peptides related to the C-terminal region of yeast iso-1-cytochrome c were carried out and compared with conformational studies on horse cytochrome c fragments. Evidence is presented for a weaker predisposition for ordered structure in the former peptides when compared with the corresponding region in horse cytochrome c. These findings agree with theoretical predictions and with observations that yeast and other mammalian type cytochromes c differ in several minor respects.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 41
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2107-2114 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A polarimetric electric-field-jump relaxation apparatus is described and used to determine the relaxation spectrum for the helix-coil transition of poly(α,L-glutamic acid) in water at 24°C. A maximum relaxation time of 1.7 μc occurs at the transition midpoint (pH = 5.9) yielding a rate constant for helical growth of 6 × 107 sec-1.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 42
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2181-2195 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Mixtures of a weak polybase (polyethylenimine) and a weak polyacid acrylamide-acrylic acid copolymer in aqueous solutions at several ionic strengths and polymer concentrations are studied potentiometrically. When the concentrations of the polyethylenimine and acrylamide-acrylic acid copolymer charges are not too different, phase separation into two liquid phases (“complex coacervation”) is observed. In the pH region where no phase separation occurs, potentiometric titrations are performed on mixtures of both polymers. From the titrations of polyethylenimine solutions, acrylamide-acrylic acid copolymer solutions, and the mixtures, the free energy of interaction has been evaluated according to the theory of Litan. The dependence of the free energy of interaction on pH, polymer concentrations, and ionic strength is explained quantitatively with a model of cooperative electrostatic physical association.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 43
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2231-2246 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The problem of deducing the DNA structure with correct base pairing and specific symmetry is formulated in the form of algebraic equations. In this way the number of independent variables determining double-helix conformation can be reduced from six to four. The effectiveness of the method is illustrated by the computations for A-DNA and B-DNA. The method allows one to predict all possible conformations of the complementary nucleic acids.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 44
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2211-2230 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The synthesis and characterization of a series of sequential polypeptides with the repeating sequences Aze-Pro-Aze, Pro-Aze-Pro, Pro-Aze-Gly, Aze-Pro-Gly, Ala-Aze-Gly, Aze-Ala-Gly, and Pro-Pro-Gly are reported. The polymers were prepared by the active ester method, using the p-nitrophenyl, pentachlorophenyl, and N-hydroxysuccinimide esters as the polymerizable tripeptide derivatives. Except for poly(Ala-Aze-Gly) obtained via the N-hydroxysuccinimide ester, all polymers were isolated in good yields and have weight-average molecular weights in the range 10,000-30,000. The molecular weights have been determined by applying the calibrated gel chromatography system described by Fairweather et al. [J. Chromatogr. (1972) 67, 157] and by viscometry. All di- and tripeptide intermediates were chemically and optically pure.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 45
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthetic regular polytripeptides of the type (Gly-R2-R3) where R2, R3, or both, are imino acids have been widely studied as model compounds for collagen. One such polytripeptide is poly(Gly-Pro-Hyp), since triplets with this sequence constitute about 10% of collagen. Recently, a new model has been proposed for this polytripeptide in which one of the three peptide bonds in the tripeptide unit is in the cis conformation, and the γ-hydroxyl group of hydroxyproline forms a direct interchain hydrogen bond within the triple helix. We have confirmed this structure by model building using computer techniques, and the helical parameters obtained by us are close to the experimentally observed values. The model is also found to be comparable in stability with other models from energy considerations.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 46
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2479-2487 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Several globular proteins have values of the Scheraga-Mandelkern β parameter significantly below the theoretical minimum value, β0 = 2.112 × 106, for an impermeable sphere. Using the Felderhof-Deutch generalization of the Debye-Bueche-Brinkman theory of hydrodynamics of porous spheres, we have shown that values of β slightly below this supposed minimum are theoretically expected. A porous sphere of uniform density has a minimum β of 2.084 × 106 at a Debye shielding ratio of 6.5, corresponding, for example, to a sphere radius of 11 Å and an inverse hydrodynamic shielding length of 0.6 Å-1, values not far from those of small proteins. A two-layer porous sphere model gives similar results. Although this is the first theoretical explanation of values of β below β0, the theory is incomplete since β values as low as 2.03 × 106 are observed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 47
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2489-2506 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: NMR measurements of poly(γ-benzyl-L-glutamate) are reported in several different strengths of magnetic field to determine the relaxation time of the helix-coil transition. Nmr spectra of various samples had line shapes varying from the double to single, depending on the extent of the polydispersity of the sample. This result indicated that the correct line shape of a polypeptide is obscured in the overlapping of multipeaks, which are due to the heterogeneity of the molecular weight in the sample. Thus, the conventional line-shape analysis could not be applied to the kinetic study of the helix-coil transition of polypeptides without consideration of this polydispersity effect on the line shape.To overcome this difficulty, we measured linewidths of nmr spectra for fairly monodisperse samples, using various nmr spectrometers, having field strengths from 60 to 220 MHz. The results were analyzed by a quadratic equation, which involves an additional term proportional to the frequency difference of two sites. The equation differs from the conventional quadratic equation, usually utilized in the case of the fast-exchange limit, only in this additional term. This modification is required to evaluate correctly the unusual broadening of the linewidth resulting from the polydispersity effect and to determine the relaxation time reflected in nmr.Nmr spectra of three samples (DP-35, 85, and 250) were measured by 220-, 100-, and 60-MHz spectrometers in trifluoroacetic acid/chloroform at 28°C and linewidths were analyzed. Relaxation times of the helix-coil transition obtained at the transition midpoint are 2.5 × 10-4, 7 × 10-4, and 1.1 × 10-3 sec, for DP-35, 85, and 250, respectively.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 48
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2537-2553 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Theoretical expressions are derived for the change in the polarized components of the fluorescence, resulting from the orientation of a rigid molecule bearing a chromophore with arbitrary angles for the absorption and transition moments \documentclass{article}\pagestyle{empty}\begin{document}$ \vec \mu _a $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ \vec \mu _e $\end{document} with respect to the molecular axis. The break in the symmetry relation HV = VH is related to the tilt angle between \documentclass{article}\pagestyle{empty}\begin{document}$ \vec \mu _a $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ \vec \mu _e $\end{document}. The theory is applied to a sonicated DNA-2-hydroxy-4,4′-diamidinostilbene complex, in the blue and red emission bands of this peculiar dye. Simultaneous measurements of linear dichroism and fluorescence lead to the determination of an angle of 47° between a fluorescent bound dye and the DNA axis, with no difference for the blue- and red-emitting species, but confirm the presence of nonfluorescent bound dye in a more perpendicular arrangement.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 49
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2613-2623 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The translational drag, rotational drag, and intrinsic viscosity of spherical multisubunit structures have been calculated analytically using the Felderhof-Deutch theory of polymer frictional properties. The structures considered were hollow shells, spheres with uniform subunit density, and spheres covered with a subunit layer of different density. Changes in the transport coefficients resulting from the random removal of subunits and from the variation of subunit size are calculated. For the case of the shell, the results agree with the numerical computations of Bloomfield, Dalton, and Van Holde [Biopolymers 5, 135, 149 (1967)].
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 50
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Interactions of glutaraldehyde with either n-butylamine, poly(α,L-lysine), or collagen resulted in a fast release of protons in dilute aqueous solutions at various pH values, followed by much slower changes. The latter reactions, which extended over hours and days, were followed spectrophotometrically and revealed the formation of distinct absorption bands in the visible and near-ultraviolet regions in all the above systems. The visible-range bands disappeared upon treatment with sodium borohydride. A qualitative relationship between oxygen uptake by the system n-butylamine-glutaraldehyde and the slow formation of colored products has been established, while the chemical nature of the reaction products has not been determined.Sedimentation velocity, viscosity, and optical rotation measurements on the products of interaction between poly(L-lysine) and glutaraldehyde in aqueous solution indicated large conformational changes in the polyamino acid present in excess (in residues) over the dialdehyde. In particular, the intrinsic viscosity dropped considerably after interaction, indicating intramolecular crosslinking. At molar ratios of 1:1 between polylsine residues and aldehyde groups, intermolecular crosslinking of polylysine was obtained at pH 8.6.Electron microscopic examinations of collagen samples treated by glutaraldehyde at various pH values indicated changes from unordered to more ordered structures upon treatment with glutaraldehyde, in particular at pH 10.The present structural and optical investigations are considered to be relevant to tanning processes of hides and to fixation procedures.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 51
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1-14 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The template directed synthesis of poly[d(A-T)] from the nucleoside triphosphates in the presence of DNA polymerase I is carried out continuously in a stirred flow reactor for the first time. The initial objective is to test the kinetic stability of the established steady states at various flow rates. Graphical analysis predicts instable steady states for certain high flow rates. As a consequence of instabilities multiple steady states and steady-state hysteresis may occur. Steady-state hysteresis has now been found experimentally. For a different enzyme fraction of low exonuclease activity we found the steady-state absorbance at 260 nm to be almost invariant with flow rate at high enzyme concentrations even if the flow rate was increased by a large factor. We call this phenomenon kinetic buffering. Relaxation of a large flow perturbation approaches the steady state in a sigmoidal fashion. Concentration oscillations at 260 nm occurred in one experiment using an enzyme fraction of low exonuclease activity after perturbing the steady state by monomer (dATP). Advantages of the stirred flow reactor method over serial transfer are discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 52
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The far-ultraviolet circular dichroic spectrum of the 39-residue peptide hormone porcine corticotropin and the biologically active fragment corticotropin 1-24 is negative from 250 nm to 195 nm in water, but in 6M guanidinium chloride a positive band appears at about 225 nm. The temperature and guanidinium chloride dependence of this spectral transition indicates the absence of any stable ordered secondary structure in corticotropin and the spectrum is seen to be in only partial agreement with results using the model peptide chromophore, Ala-Ala-Ala. Using oligopeptides containing aromatic amino acid residues sandwiched between glycyl residues, it is shown that the shape and intensity of the corticotropin 225 nm positive band which appears in 6M guanidinium chloride is in agreement with the far-ultraviolet transitions of the aromatic chromophores in the hormone. Curve resolution of the near-ultraviolet circular dichroic spectrum of corticotropin and comparison of the rotational strengths of the phenylalanyl and tyrosyl bands reveals no evidence for increased rotational freedom in 6M guanidinium hydrochloride. Spectral changes are observed, however, in the transitions arising from the single tryptophan. This study suggests that corticotropin in aqueous solution may serve as a better model for the circular dichroic spectrum of the aperiodic regions in globular proteins than either synthetic homopolypeptides or reference proteins for which spectral and X-ray diffraction data are available.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 53
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 131-152 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An all-order classical coupled oscillator theory in which monomer band shapes are explicity taken into account is applied to the calculations of polynucleotide circular dichroism. Calculations are shown for ApA and oligoadenylic acid of varying chain lengths, in both RNA and B-DNA geometry, and the advantages of this theory are assessed. By introducing an effective dielectric constant, good agreement with measured spectra is obtained. Variations in monomer parameters are tested in an attempt to eliminate remaining discrepancies between calculated and measured spectra.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 54
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 203-218 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The Raman Spectra of bovine serum albumin have been obtained in the solute state, in alkaline and acidic solutions, and in the gel. The reversible denaturations of bovine serum albumin solutions by heat, acid's, and alkali were studied and a new mechanism for heat denaturation has been proposed based on a continuous unfolding of the α-helices.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 55
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 219-225 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: New techniques in laser Raman spectroscopy are used to obtain spectra of aqueous solutions of lysozylme for frequency shifts as small as 5 cm-1. In addition, Raman measurements are made on two crystalline forms of hen egg white lysozyme. The spectra obtained from the solution and from the crystal are found to be similar for frequencies above 100 cm-1. However, a low-frequency band at 25 cm-1 observed in crystalline lysozyme is not found in the solution, indicating that this band cannot be attributed to an internal molecular vibration.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 56
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 257-263 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The adsorption of protein films on polystyrene latex spheres was studied by optical mixing spectroscopy. With this technique, we show that both the hydrodynamic thickness of protein films and their optical density can be measured. Thus, we found that films of the glycoproteins isolated from the human erythrocyte membrane were four times as thick as films of either human serum albumin or bovine serum albumin for about the same surface coverage. This result suggests an end-on orientation for the adsorbed glycoprotein molecules, which is consistent with the model proposed by others for the orientation of these molecules at the surface of the red blood cell itself.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 57
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 293-299 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Solvent binding to bovine serum albumin in 2-chloroethanol-water mixed solvents of different composition, measured previously by Inoue and Timasheff (Biopolymers (1972) 11, 737-43) is applied to a hydrodynamic study of the solvated protein.From sedimentation and diffusion data, the apparent molecular weight of the solvated protein particle can be calculated, provided an average partial specific volume, computed from the composition of the particle, is introduced in Svedberg's equation. The unsolvated molecular weight of the protein can than be calculated by subtraction of the bound solvent. Further data on the hydrodynamic particle (f/fmin and axial ratio of the equivalent ellipsoid) are readily calculated from these experiments, and reinforce the supposition that 2-chloroethanol is a strong helix-inducing solvent.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 58
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2625-2637 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In order to obtain a molecular picture of the A and B forms of a DNA subunit, potential energy calculations have been made for dGpdC with C(3′)-endo and C(2′)-endo [or C(3′)-exo] sugar puckerings. These are compared with results for GpC. The global minima for dGpdC and GpC are almost identical. They are like A-form duplex DNA and RNA, respectively, with bases anti, the ω′, ω angle pair near 300°, 280°, and sugar pucker C(3′)-endo. For dGpdC, a B-form helical conformer, with sugar pucker C(2′)-endo and ω′ = 257°, ω = 298°, is found only 0.4 kcal/mol above the global minimum. A second low-energy conformation (2.3 kcal/mol) has ω′ = 263°, ω = 158° and ψ near 180°. This has dihedral angles like the original Watson-Crick model of the double helix. In contrast, for GpC, the C(2′)-endo B form is 6.9 kcal/mol above the global minimum. These theoretical results are consistent with experimental studies on DNA and RNA fibers. DNA fibers exist in both A and B forms, while RNA fibers generally assume only the A form. A low-energy conformation unlike the A or B forms was found for both dGpdC and GpC when the sugars were C(3′)-endo. This conformation - ω′,ω near 20°,80° - was not observed for C(2′)-endo dGpdC. Energy surface maps in the ω′,ω plane showed that C(2′)-endo dGpdC has one low-energy valley. It is in the B-form helical region (ω′ ∼ 260°, ω ∼ 300). When the sugar pucker is C(3′)-endo, dGpdC has two low-energy regions: the A-form helical region and the region with the minimum at ω′ = 16°, ω = 85°.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 59
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976) 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 60
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 403-414 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We have carried out a detailed study of ligand binding of ferrihemoglobins under various conditions. Our results show that n varies with time and that this variation is paralleled by changes in the spectrum of methemoglobin. This suggests some form of structural perturbation. The time-dependent value of n is discussed in terms of the observed spectral changes accompanying prolonged equilibration.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 61
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The nmr titration curves of chemical shifts versus pH were observed for the protons of various histidine-containing di- and tripeptides. With these results, the macroscopic pKa values and the chemical shifts intrinsic to each ionic species were determined by a computer curve-fitting based on a simple acid dissociation sequence. The pKa value of the imidazole ring in N-acetyl-L-histidine methylamide was assumed to represent the intrinsic (or unperturbed) pKa of the imidazole rings of histidine having peptide linkages at both the CO and NH sides. The pKa values of the imidazole rings observed for most di- and tripeptides were reasonably reproduced by simple calculations using the intrinsic value and the perturbations due to the CO2- and NH3+ groups located at various positions. Some other factors affecting the pKa value of the imidazole ring are also discussed.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 62
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976) 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 63
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 241-255 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The hyperchromic and hypochromic changes in the intensity of the amide-I and amide-III lines of polypeptides and certain ring vibrations of the bases of polynucleotides are shown to be related to similar changes in the lower energy uv absorption bands. The selection rules strictly limit the pairs of excited electronic states that can contribute to the elements of the polarizability matrix. An energy-dependent term in this equation weights the contribution of the pairs of electronic transitions in favor of those involving the lower energy transitions. For both polypeptides and polynucleotides, there is a large hypochromic inensity change in the first π → π* exciton band upon the coil-to-helix transition. Through the selection rules, certain conformationally sensitive Raman lines are shown to derive their intensity predominantly from this band and hence also display hypochromism. Again, through an application of the selection rules, certain Raman lines can be demonstrated to depend predominantly for their intensity upon the n → π* transition, and consequently have the opposite hyperchromic intensity change upon the same conformational transition.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 64
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 301-315 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Transient electric birefringence experiments have been performed on well-characterized highly monodisperse samples of tobacco mosaic virus (TMV). Experiments and calculations are presented that show that the sensitivity and accuracy of the traditional transient electric birefringence technique can be enhanced by several orders of magnitude through the use of a low-powered laser and crystal polarizing optics, signal averaging, and digital data processing. Measurements of the field-free decay of the birefringence yield for the rotational diffusion coefficient, DR = 318 ± 3 sec-1. The length of the rodlike virion, calculated from the Broersma equation with this value of DR and a rod diameter of 15 nm, is 292.5 ± 1.0 nm. Measurements of the growth of the birefringence when an electric field is applied across the sample yield μ2/kT(α∥ - α⊥) = 0.47 ± 0.07, where μ is the permanent dipole moment (assumed parallel to the symmetry axis of the virus) and α∥ - α⊥ is the electrical polarizability anistropy of the virus. Using the value of α∥ - α⊥ measured by O'Konski et al., we then obtain μ = 2.5 × 10-14 esu cm.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 65
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The high-resolution nmr spectrum of baker's yeast tRNACUALeu, a recently sequenced non-denaturable tRNA, has been compared with the spectra of the native and denatured conformers of the closely related species tRNAUUGLeu. Because of the presence of many common base pairs in the different tRNA's, it is possible to assign most of the low-field resonances to specific secondary-structure base pairs. A comparison of the observed positions of the various resonances with those predicted by a semiempirical ring-current shift theory shows a root-mean-square deviation of 0.14, 0.11, and 0.12 ppm for tRNAUUGLeu (native), and tRNAUUGLeu (denatured), respectively. These results support the ring-current shift theory currently used to interpret the low-field nmr spectra of the tRNA molecules. Differences between the predicted and observed positions of some resonances provide new evidence for higher order effects such as shifts from second nearest neighbors, anomalous shifts exerted by G·U base pairs, and tertiary-structure effects. A model that was previously proposed for the denatured conformer of tRNAUUGLeu is also supported.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 66
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 319-334 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The properties of apomyoglobin were examined in aqueous solutions and various helix- and random-coil-forming solvents by solvent perturbation, optical rotation, circular dichroism, and viscosity measurements. The solvent perturbation data obtained in neutral aqueous solutions suggest 25-40% exposure of the two tryptophyl residues and 50-60% exposure of the three tyrosyls. The estimates of burial of these groups are in the ranges expected for myoglobin based on its X-ray structure. In the helicogenic alcohols, methanol, ethanol, 2-chloroethanol, trifluoroethanol, and 1-propyl alcohol, as well as in acidic solutions, 8 M urea and 6M guanidine hydrochloride, essentially all the tryptophyl and tyrosyl residues are found to be exposed to solvent based on this method. Analysis of the ORD and CD data indicates that in the alcohols the α-helix content of apomyoglobin has in most cases changed from 58-59% to about 80-95%. Analysis of the intrinsic viscosity data based on the equations of Simha and Kirkwood and Auer indicates that the polypeptide chain in these solvents has the dimensions of fully extended α-helical rods, with lengths of 221-251 Å and mean diameters of 12.8-13.6 Å. It is concluded that apomyoglobin in the various alcohols must have an extended but somewhat irregular rodlike structure, having a few bend or irregular sequences between the α-helical segments due largely to the presence of the four proline residues, 37, 88, 100, and 120 in the amino acid sequence.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 67
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 335-351 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The fluorescence parameters, lifetime, relative quantum yield, maximum and mean wavelength, half-width, and polarization, of bovine serum albumin (BSA) were measured at 15°C in aqueous solutions containing varying concentrations of different chemical perturbants, glycerol, Cu2+ ions, guanidine hydrochloride, and urea. By considering a quenching mechanism as being either dynamic or static, depending upon whether the quenching is or is not accompanied by a change in the fluorescence lifetime, we were able to correlate the changes produced in the various fluorescence parameters by the different chemical perturbants with changes in macromolecular structure as the concentration of perturbant was gradually increased. The addition of glycerol and of Cu2+ ions indicated that in aqueous BSA both tryptophan residues are below the surface of the macromolecule, out of contact with solvent water, and, as a consequence, they are statically quenched. “Ultra-Pure” guanidine hydrochloride at 2.4 M or more caused a drastic conformation change, which resulted in the emergence of a visible tyrosine peak at 304 nm in the BSA fluorescence spectrum when either 260- or 270-nm excitation was employed. With the same excitation, the enhancement of BSA tyrosine fluorescence by 6-8 M ultra-pure urea produced only a shoulder near 304 nm in the BSA fluorescence spectrum. We have introduced the use of a new relative quantum yield for protein fluorescence, q′, referenced to the quantum yield of unquenched free tryptophan, which eliminates the quenching action of water from the reference.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 68
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976) 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 69
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The molecular theory of the previous paper in this series is extended to determine the effect of divalent metal ions on helix stability relative to coil at fixed ionic strength and nucleotide phosphate concentration. Specification of the state of condensed counterions, as well as their concentration, is essential for the solution of this problem, and it is assumed that they translate freely within a thin cylindrical shell close to the polynucleotide. As a function of divalent counterion concentration mB2+ the relative stability of the helix is highly nonlinear. Although the overall trend is that the helix stability increases with addition of divalent metal ion, there is a narrow concentration range for which it decreases slightly. The behavior of the relative stability as a function of mB2+ is determined by the translational degrees of freedom of the counterions, both univalent and divalent, both condensed and uncondensed. Detailed comparison of the theory with data is not given here, but it is pointed out that the calculated values of the relative stability are consistent with the order of magnitude of the observed effect Mg2+ on the melting temperature.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 70
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 503-506 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: X-ray diffraction studies have been made on the polytripeptide poly(L-prolyl-L-α-phenylglycyl-L-proline). Its structure has been found to be helical, with a poly(L-proline) II conformation, packed in an orthorhombic lattice, space group P21212, with a = 14.3 Å, b = 13.5 Å, and c = 9.4 Å.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 71
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 583-587 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 72
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 591-594 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 73
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976) 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 74
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 649-653 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The stability constant of the complex of tRNA with 50S subunits of ribosomes was compared in ordinary and heavy water. A considerable effect (about fourfold) was observed, showing the importance of hydrogen bonds in this interaction. In addition, the isotope effect of complementary polynucleotide interaction was measured for two examples. In the case of the binary complex of heptainosinic acid oligomers with poly(C) in the presence of 10-3 M MgCl2, the transfer from ordinary to heavy water gave an increase of the stability constant of about 5%. But in the case of a ternary complex of hexaadenylic acid with poly(U) under the same conditions, the stability constant in D2O increased threefold. The isotope effect depends strongly on magnesium ion concentration and is possibly due to some specific mechanism of magnesium ion complexing involving water molecules.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 75
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 409-417 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The storage and loss shear moduli, G′ and G″, have been measured for dilute solutions of unaggregated and aggregated tobacco mosaic virus samples in glycerol-water mixtures, by the Birnboim-Schrag multiple-lumped resonator modified for use with aqueous solvents. The frequency range was 100-5800 Hz, the concentration range 0.6-2.1 × 10-3 g/ml, and the temperatures 25.0° and 37.8°C. The number-average and weight-average molecular weights of the aggregated sample were estimated as 1.4 and 2.0 × 108, respectively, from electron microscopy. The extrapolated intrinsic moduli [G′] and [G″] were compared with the predictions of the Kirkwood-Auer theory for rigid rodlike molecules. For the unaggregated sample, the frequency dependence of [G′] and [G″] agreed well with the theory assuming the intrinsic viscosity to be 27 ml/g, though the asymptotic limit of [G′]M/RT at higher frequencies was slightly larger than the theoretical value of 3/5. For the aggregated sample, the data agreed with theory for rigid rods as modified to account for molecular-weight distribution.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 76
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 999-1000 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 77
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1009-1013 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 78
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1061-1080 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Monte-Carlo calculations of geometric and thermodynamic characteristics of the α-helix and the β-structure of polypeptides have been carried out. To describe a hydrogen bond both the Lippincott-Schroeder and Morse potentials were used. The internal rotation angles ϕ and ψ in the α-helix have been shown to fluctuate in the range of ±7°. The distribution functions on angles ϕ and ψ and on hydrogen bond lengths and angles in the α-helix have been computed and compared with those in myoglobin and lysozyme. Thermodynamic characteristics of the α-helix calculated in different approximations with the two forms of the hydrogen bond potentials have also been compared. The data obtained are close to the experimental values for polypeptides in neutral solution.Some geometric and thermodynamic characteristics of the regular parallel and antiparallel and irregular antiparallel β-structure have been found. In the β-structure the internal rotation angles vary within the interval ±15-20°. An increase in the cross and longitudinal dimensions of the β-structure only slightly influence both the geometric and thermodynamic characteristics.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 79
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The preparation of the co-oligopeptides of the series H-Gly-Phe-(Gly)n-Trp-Gly-OH (n = 0, 1, 2) and of other free peptides of glycine, L-tryptophan, and L-phenylalanine is reported. The syntheses have been carried out by conventional methods, using N-hydroxysuccinimide esters for the coupling steps. The ultraviolet absorption properties of the free peptides have been investigated in water. No hypo- or hyperchromicity was found for the aromatic chromophores, with the exception of H-Gly-Phe-Trp-OH, which shows a small but significant hypochromicity. The contribution of the peptide bond to the molar absorptivity in the far ultraviolet has been separated from that of the side chain plus the —COO- group by plotting the measured molar absorptivity ∊ of the farthest accessible uv maximum as a function of the number of peptide bonds (nA). The peptide bond contribution proved to be independent of nA in the range nA = 1-5, thus ruling out the onset of helical conformations in the longer chain peptides.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 80
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The properties of the electron distribution in amides, peptides, and carboxylic acids, obtained from ab-initio molecular orbital calculations using both minimal and extended basis sets have been studied. These properties are discussed in terms of some of the common assumptions made in empirical conformational calculations of biomolecules. In particular, population analyses of 15 compounds in these families were carried out with both the minimal and extended basis sets, and compared with results of CNDO/2 calculations. It is suggested that population analysis is a useful tool for recognizing patterns of charge distributions, and investigating the transferability of parameters of different functional groups. However, its use for providing partial charges for conformational analysis is a questionable procedure.A more detailed analysis of the charge distribution was carried out by calculating the spatial electron distribution in the four compounds, N-methylacetamide, acetic acid, diketopiperazine, and N-acetyl-N′-methylalanine. Both total electron-density maps and differencedensity maps are presented. The properties of the overall shape of the molecule and the atoms in the molecule, are discussed in terms of the former along with three-dimensional shape plots of the total density. The distortion accompanying molecular formation, resulting in such features as the lone pair orbital and “bonding deensities” is discussed in terms of the difference maps. Semiquantitative estimates of the bonding and orbital densities resulting from the integration of the densities are also presented. Finally, one of the novel features of the study is the presentation of three-dimensional surfaces of constant difference densities from which the shapes of the orbitals and bonding densities emerge.
    Zusätzliches Material: 18 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 81
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1233-1242 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The lack of the positive band at around 226 nm in the CD spectra of poly(prolyl-azetidine-2-carbonyl-proline) in trifluoroethanol and of poly(azetidine-2-carbonyl-prolyl-azetidine-2-carboxylic) acid in F3EtOH and water, the hyperchromism of the absorption maximum at about 202 nm, and the extremely small intensity of the Cβ-Pro, Cγ-Pro, and Cβ-Aze signals for the cis peptide bonds in the 13C nmr spectrum of poly(Pro-Aze-Pro) in F3EtOH indicate that both polyproline analogs exist as disordered chains in this solvent, the trans peptide group being maintained. The disordering of the chains is attributed to an increase in the accessible range of ψ due to the reduced dimensions of the square ring of L-azetidine-2-carboxylic acid residue relative to the pyrrolidine ring of proline and to strong interactions of the haloalcohol with the peptide groups of the chains.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 82
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1283-1299 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Two methods for the characterization of protein molecular weights from their diffusion coefficients are discussed. These measurements can be made quickly and reliably at low concentrations using quasielastic light-scattering techniques. First, an empirical calibration of the diffusion coefficient at infinite dilution of denatured random coils against molecular weight is reported. The second method combines the measurement of D0 with the intrinsic viscosity [η]. This D0-[η] relationship proves to be very insensitive to polymers structure or solvent type. The data indicate that the ratio of the hydrodynamic radius measured by viscosity to the hydrodynamic radius measured by diffusion is about 15% smaller than that predicted by theoretical models. The nature of the molecular-weight average obtained for polydisperse systems is defined for a Schulz distribution. These hydrodynamic methods have also been used to demonstrate the presence of chain branching in the glycoprotein ovomucoid. In addition, a method is proposed by which the effective segment length and an excluded volume parameter for random coils may be evaluated for diffusion measurements.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 83
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1425-1430 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 84
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1431-1435 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 85
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The influence of one DNA region on the stability of an adjoining region (telestability) was examined. Melting curves of three block DNA's, d(C15A15)·d(T15G15), d(C20A15)·d(T15G20), and d(C20A10)·d(T10G20) were analyzed in terms of the nearest neighbor Ising model. Comparisons of predicted and experimental curves were made in 0.01 M and 0.1 M sodium ion solutions. The nearest neighbor formalism was also employed to analyze block DNA transition in the presence of actinomycin, a G·C specific molecule. The results show that nearest neighbor base-pair interaction cannot predict the melting curves of the block DNA's. Adjustments in theoretical parameters to account for phosphate repulsion assuming a B conformation throughout the DNA's do not alter this conclusion. Changes in the theoretical parameters, which provide good overall agreement, are consistent with a substantial stabilization of the A·T region nearest the G·C block. The melting temperature T A·T for the average A·T pari in d(C20A10)·d(T10G20), with 10 A·T pairs, appears to be 4°C greater than TA·T for d(C15A15)·d(T15G15) and d(C20A15)·d(T15G20), both with 15 A·T pairs. Actinomycin bound to the G·C end effectively stabilizes the A·T end by 9°C. These results indicate a long-range contribution to the interactions governing DNA stability. A possible mechanism for these interactions will be discussed.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 86
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Dielectric relaxation studies in the frequency range 100 Hz to 2 MHz of poly(γ-benzyl-L-glutamate) in dioxane have been carried out over a range of concentration 10-4-10-2g/g. The structure of aggregates is analyzed in terms of dipole moment and relaxation time. A critical concentration (≃ 10-3 g/g for the studied molecular weights) has been determined below which the aggregates are found to have linear head to tail type structure. Above the critical concentration a different structure of aggregates is apparent which could not be fully analyzed by these measurements alone. Possible forms of aggregation above the critical concentration are discussed. Formation of long range order which would lead to nematic liquid crystalline phase at higher concentrations has been discussed as one of the possible explanations for the observed behavior above the critical concentration.Maximum length of linear head to tail type aggregates for poly(γ-benzyl-L-glutamate) in dioxane as determined from these results correspond to an α-helix of molecular weight 210,000. A slight difference in the purity of dioxane has been shown to have an influence on the reproducibility of the state of aggregation as well as on the rate of disaggregation on dilution.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 87
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1585-1590 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Racemization in the synthesis of peptide intermediates and their polymers was investigated, using L-amino acid oxidase. The formation of N-hydroxysuccinimide esters from N-protected peptide acids yielded optically pure products in contrast to p-nitrophenyl and pentachlorophenyl active esters. The racemization in the polymerization step was found to be base sensitive. Partially racemized polymer can result from optically homogeneous monomer. Thus, the optical integrity of active monomer species carries no guarantee for that of the polymer.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 88
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1623-1635 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Conformations containing all trans peptide bonds have previously been proposed for N-methylleucine gramicidin-S and (di-N-methylleucine) gramicidin-S based on an evaluation of proton nuclear magnetic resonance parameters in a series of solvents. These gramicidin-S derivatives exhibit full biological activity despite the fact that the proposed solution conformations differ in backbone topology and relative orientation of the Phe and Orn side chains compared to gramicidin-S. The present authors discuss conformations for N-methylleucine gramicidin-S and (di-N-methylleucine) gramicidin-S which incorporate cis peptide bonds at L-Orn-L-N-MeLeu, where the gramicidin-S backbone is essentially retained, and the relative orientation of the Pro, Orn, Val, and Phe side chains correspond to those observed for gramicidin-S. A novel hydrogen-bond arrangement involving one carbonyl group interacting with two peptide protons (1 ←4 and 1 ←5 types) is proposed to stabilize the backbone conformation in the gramicidin-S derivatives. A recent report on the cyclic heptapeptide antibiotic, Ilamycin B1, shows the presence of cis peptide bonds at N-CH3 amino acids, as well as the novel hydrogen-bond arrangement presented above.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 89
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The morphology of fibrin strongly depends on solvent medium, as shown by clotting experiments carried out in the presence of different salts. The clots were characterized by electron microscopy and spectrophotometric methods; the kinetics of gelation were determined.In the presence of electrolytes which strongly delay clotting, the strands are thin and few branching points are observed; opposite morphological changes are induced by salts which act as accelerating agents. On the basis of this correlation, and of previous data on the structure of fibrin, a kinetic model of the self-assembly process is outlined. It accounts well for the observed solvent effects on the morphology of the network.An important result emerging from our experiments is that the fibers undergo branching prior to gelation. Branching points arise from the defective growth of the fibers; a simple explanation of the occurrence of branching may be obtained by our self-assembly model.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 90
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 2025-2041 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The equilibrium between the cis and trans forms of X-Pro peptide bonds can readily be measured in the 13C nmr spectra. In the present paper we investigate how observation of this equilibrium could be used as an nmr probe for conformational studies of flexible polypeptide chains. The experiments include studies by 13C nmr of a series of linear oligopeptides containing different X-L-Pro peptide bonds, with X = Gly, L-Ala, L-Leu, L-Phe, D-Ala, D-Leu, and D-Phe. Overall the study confirms that X-Pro peptide bonds can generally be useful as 13C nmr probes reporting the formation of nonrandom conformation in flexible polypeptide chains. It was found that the cis-trans equilibrium of X-Pro is greatly affected by the side chain of X and the configuration of the α-carbon atom of X. On the basis of these observations some general rules are suggested for a practical applications of the X-Pro nmr probes in conformational studies of polypeptide chains.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 91
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Random copolymers of L-glutamic acid and ortho-nitrobenzyl-L-glutamate were synthesized with different percentages of nitrobenzyl-L-glutamate, from 3 to 22%. These copolymers were studied by circular dichroism (CD) and potentiometric titrations in aqueous solutions in order to determine the variation of the stability of the secondary structure when the concentration of nitrobenzylglutamate varies in the copolymer. We observed that the stability increases with the concentration of glutamate. Such a stabilization could be due to either side-chain interactions or interactions between the aromatic side chain with the backbone. An intermolecular aggregation was observed when the percentage of nitrobenzylglutamate was sufficently important, but such an aggregation may be avoided if a dioxane/water mixture is used as a solvent.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 92
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 2185-2199 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The kinetics of γ-benzyl-L-glutamate NCA's polymerizations in dioxane as solvent are discussed. The partial orders respective to [A], the NCA concentration and [I0], the initial initiator concentration are given; the rate constants are deduced and a mechanism is proposed to justify a rate of polymerization Vp = k[A][I0]2.The dependence of the rate constants on the conformation of the growing chains is demonstrated; the acceleration is attributed to the ordered structures favorable to hydrogen bonding. The kinetics of aging have also been examined and discussed; it is shown that they cannot modify the kinetics of polymerization.The DPn were obtained on the same samples before and after debenzylation; it is proved that at any concentration, DPn ≃ [A0]/[I0].The molecular-weight distributions were obtained by chromatography and a polydispersity lower than 1.3 was deduced for each sample. The trimodal distribution, appearing as soon as [A0]/[I0] is larger than 3, is attributed to the existence of the three structures σ, β, and α. The weight fraction of each of the structures was correlated to the kinetics of polymerization.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 93
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1903-1915 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The crystal structure of native cellulose (Valonia) has been analyzed by electron diffraction. Possible models for the structure were refined by rigid-body least squares methods, which incorporated parameters defining the preferred orientation of the fibrils around their long axes in the cell wall lamellae. The structure was found to consist of an array of chains having the same sense (i.e., parallel), with packing parameters similar to those recently determined by X-ray diffraction. The eight-chain unit cell could be approximated adequately by a two-chain monoclinic unit cell with dimensions a = 8.18 Å, b = 7.84 Å, c = 10.38 Å (fiber axis), and γ = 97.04°; the space group is P21.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 94
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1939-1950 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The coil-to-helix transition temperatures of hydrogen bearing and deuterated poly(γ-benzyl-L-glutamate) in 1,3-dichlorotetrafluoroacetone/H2O and/D2O mixtures, respectively, have been determined. Together with previously obtained data for the conformational transition of this polypeptide in normal and deuterated dichloroacetic acid, these results have been used in an analysis of the effect of deuterium substitution on the intrinsic stability of the α-helical form of poly(γ-benzyl-L-glutamate). The findings, consistent for both solvent systems, showed that the deuterated polypeptide is some 5% more stable than the normal protonated poly(γ-benzyl-L-glutamate), while the polypeptide-active solvent interaction enthalpy is also slightly increased by deuterium substitution in the respective molecules. A consideration of available data for poly(β-benzyl-L-aspartate) reveals an anomaly with respect to the present analysis.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 95
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1669-1676 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Transient electric birefringence measurements on poly(L-lysine hydrobromide) in methanol-water mixtures have been carried out at various solvent compositions in the vicinity of the helix-coil transition region (from 87 to 98 vol % methanol). Anomalous birefringence transients were observed between 90 and 95 vol % methanol above a threshold field strength. A distinct difference between the responses to weak and strong electric fields was noticed over a narrow range of the solvent composition. The effects of polymer concentration and temperature on the field-strength dependence of the birefringence were studied at a solvent composition of 90 vol % methanol where the anomalous transients appeared most clearly. The double logarithmic plots of the steady-state specific birefringence versus the square of field strength for different concentrations and temperatures could be superimposed by shifting them horizontally along the abscissa. The threshold field strength which was determined from the shift factor decreased with decreasing concentration. The results provide further evidence that strong electric fields can cause a helix-coil transition in this system under favorable conditions.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 96
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1701-1715 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Derivatives of tetrapeptide sequences considered likely to form β-turns were investigated by the study of their proton magnetic resonances in methanol and in water. Differential broadening of N - H resonances by an added nitroxyl was used to indicate the presence of the sequestered N - H proton expected in β-turn conformations. Transfer of magnetic saturation from solvent water protons to N - H protons was also examined. The evidence is consistent with significant contributions by β-turn-like backbones to the conformational averages in methanol of the sequences Gly-L-Pro-D-Val-Gly, D(or L)-Val-L-Pro-Gly-Gly, and Gly-L-Pro-L-Asn-Gly, but not the sequence Gly-D-Ala-L-Val-Gly. It is suggested that a Type I turn, Likely in Gly-L-Pro-L-Asn-Gly derivatives, is characterized by sequestered N - H protons of both the third and fourth residues. For all of the peptide derivatives, save possibly Ac-L-Val-L-Pro-Gly-Gly-NHNH2, contributions from folded structures in water are not detectable by line-broadening experiments. However, the transfer of saturation experiments may be interpreted as indicating some degree of chain folding in water.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 97
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1717-1739 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In this paper we use probabilistic arguments to derive and discuss the spatial distribution of molecules which are undergoing electrophoresis or centrifugation while at the same time they are switching back and forth between two configurational states. An exact solution is obtained for arbitrary values of the diffusion coefficients of the two isomerizing states. The traditional analytic method of solving this problem, namely, by use of “master equations,” is not completely satisfactory because one can find only the Fourier transform of the solution rather than the solution itself. Our treatment yields the answer one would get if it were feasible to perform the inversion of the Fourier transform.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 98
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1815-1824 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A series of sequential oligopeptides having simple nonpolar side chains, Nps-(L-Ala-L-Leu-Gly)n- OEt has been prepared by a stepwise fragment-condensation method using Nps-L-alanyl-L-leucylglycine N-hydroxysuccinimide ester, which was prepared by the Nps-N-carboxy α-amino-acid-anhydride method. The success of the synthesis of the peptide having a high-molecular weight, such as octadecapeptide, results from the highest solubility of the tripeptide unit, L-alanyl-L-leucylglycine. The sequential polypeptide having the same tripeptide sequence was also prepared by polycondensation of the tripeptide N-hydroxy-succinimide ester.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 99
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1841-1844 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 100
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1873-1875 
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...