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  • General Chemistry  (1,843)
  • AERODYNAMICS
  • Cell & Developmental Biology
  • Elasticity
  • Inorganic Chemistry
  • Niederschlag
  • 2010-2014  (31)
  • 1915-1919
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  • 1
    facet.materialart.
    Unknown
    In:  Kaden, S., Dietrich, O., Theobald, S. (Hrsg.). Wassermanagement im Klimawandel – Möglichkeiten und Grenzen von Anpassungsmaßnahmen. Berlin: oekom in Erscheinen
    Publication Date: 2014
    Description: Teilergebnise des BMBF-Verbundforschungsprojektes INKA BB, des TP 22 „Nachhaltige Managementstrategien für glaziale Seen Brandenburgs im Klimawandel“. Ergebnisse aus Berechnungen mit dem NA-Modell EGMO-D für STAR2-Szenarion mit 0 und 2K Temperaturanstieg zur Wasserstandsentwicklung von Flachseen im Raum Brandenburg KATASTER-BESCHREIBUNG: Absenkung der Seewasserspiegel im Extremfall um mehrere Meter, am größten in den Seen im Südosten Berlins und nehmen zum Nordwesten ab, Zunahme der Absenkungen ist am stärksten für Seen, welche im Vergleich zum Zufluss ein großes Volumen besitzen KATASTER-DETAIL: Tmit für (ECAHM, A1B, STAR 0.0T, d.h. T1 0.0 ... kein weiterer Temperaturanstieg nach 2000 und STAR 2.0K, d.h. T2.0 ... weiterer Temperaturanstieg nach 2000 um ca. 2K bis 2060), bis zum Jahr 2018 Stationarität des Füllungsregimes, erst danach Absenkungen zu erwarten Tmit (0K und 2K), von 0,5 m im Jahr 2018 bis auf 4,2 m im Jahr 2053, diejenigen mit 10% Überschreitungswahrscheinlichkeit von 0,4 m bis auf 2,4 m
    Keywords: Nordostdeutschland ; Szenarien 2004-2053 ; Korrelationsmethode ; Niederschlag ; Temperatur ; Verdunstung ; Abfluss ; Grundwasser
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  • 2
    facet.materialart.
    Unknown
    In:  Kaden, S., Dietrich, O., Theobald, S. (Hrsg.). Wassermanagement im Klimawandel – Möglichkeiten und Grenzen von Anpassungsmaßnahmen. München: oekom verlag, 2014, S. 121-140
    Publication Date: 2014
    Description: Ergebnisse von Simulationen der potenziellen zukünftigen natürlichen bzw. bewirtschafteten Abflüsse auf Basis der hydrologischen Modelle SWIM, EGMO, WaSiM-ETH und HBV-light bzw. des Langfristbewirtschaftungsmodells WBalMo für Klimaszenarien von STAR (weiterer Temperaturanstieg um 0 K, 2 K bzw. 3 K) sowie WettReg A1B und eines Szenarios zur Braunkohleförderung und -verstromung (Rückgang des Grundwasserabsenkungsgebiets und der Sümpfungswassereinleitung) KATASTER-BESCHREIBUNG: Rückgang der mittleren natürlichen und bewirtschafteten Abflüsse aufgrund steigender Temperaturen (und der potenziellen Evapotranspiration) sowie teilweise Rückgang der Niederschläge Bei den natürlichen Abflüssen sind die Effekte des Rückgangs des Grundwasserabsenkungsgebiets und der damit verbundenen Vergrößerung der abflusswirksamen Fläche geringer als die Auswirkungen der klimatischen Änderungen. Unsicherheiten der Ergebnisse sowohl aufgrund der Wahl des Klimaszenarios als auch des hydrologischen Modells KATASTER-DETAIL: Delte T (STAR 0K, : 2013-53 vs. 1961-1990) leichter Anstieg der natürlichen Abflüsse durch Rückgang des Grundwasserabsenkungsgebiets; jedoch Rückgang im Vergleich zur Referenzperiode um bis zu 20 % Delte T (STAR 2K, STAR 3K und WettReg A1B: Rückgang der natürlichen Abflüsse im Verlauf des Szenariozeitraums, dabei Rückgang der mittleren Abflüsse (MQ)m Vergleich zur Referenzperiode um bis zu 40 % (STAR 2K) bzw. 50 % (STAR 3K und WettReg A1B), dieser Effekt wird zum Teil durch Rückgang des Grundwasserabsenkungsgebiets gemildert. Bewirtschaftete Abflüsse STAR 0K: z.T. Anstieg bis 2030 STAR 2K, STAR 3K: deutlicher Rückgang ab 2030
    Keywords: Lausitz ; 2013-2053 ; Klima ; Niederschlag ; Temperatur ; Abfluss ; Grundwasser ; Modell
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  • 3
    Publication Date: 2014-05-16
    Description: Groundwater use in California's San Joaquin Valley exceeds replenishment of the aquifer, leading to substantial diminution of this resource and rapid subsidence of the valley floor. The volume of groundwater lost over the past century and a half also represents a substantial reduction in mass and a large-scale unburdening of the lithosphere, with significant but unexplored potential impacts on crustal deformation and seismicity. Here we use vertical global positioning system measurements to show that a broad zone of rock uplift of up to 1-3 mm per year surrounds the southern San Joaquin Valley. The observed uplift matches well with predicted flexure from a simple elastic model of current rates of water-storage loss, most of which is caused by groundwater depletion. The height of the adjacent central Coast Ranges and the Sierra Nevada is strongly seasonal and peaks during the dry late summer and autumn, out of phase with uplift of the valley floor during wetter months. Our results suggest that long-term and late-summer flexural uplift of the Coast Ranges reduce the effective normal stress resolved on the San Andreas Fault. This process brings the fault closer to failure, thereby providing a viable mechanism for observed seasonality in microseismicity at Parkfield and potentially affecting long-term seismicity rates for fault systems adjacent to the valley. We also infer that the observed contemporary uplift of the southern Sierra Nevada previously attributed to tectonic or mantle-derived forces is partly a consequence of human-caused groundwater depletion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amos, Colin B -- Audet, Pascal -- Hammond, William C -- Burgmann, Roland -- Johanson, Ingrid A -- Blewitt, Geoffrey -- England -- Nature. 2014 May 22;509(7501):483-6. doi: 10.1038/nature13275. Epub 2014 May 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geology Department, Western Washington University, Bellingham, Washington 98225-9080, USA. ; Department of Earth Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada. ; Nevada Geodetic Laboratory, Nevada Bureau of Mines and Geology and Nevada Seismological Laboratory, University of Nevada, Reno, Nevada 89557, USA. ; 1] Berkeley Seismological Laboratory, University of California, Berkeley, California 94720-4760, USA [2] Department of Earth and Planetary Science, University of California, Berkeley, California 97720-4767, USA. ; Berkeley Seismological Laboratory, University of California, Berkeley, California 94720-4760, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24828048" target="_blank"〉PubMed〈/a〉
    Keywords: *Altitude ; California ; Earthquakes/*statistics & numerical data ; Elasticity ; Environmental Monitoring ; Geographic Information Systems ; Groundwater/*analysis ; *Models, Theoretical ; Seasons ; Water Supply/analysis/*statistics & numerical data
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2014-04-05
    Description: When mounted on the skin, modern sensors, circuits, radios, and power supply systems have the potential to provide clinical-quality health monitoring capabilities for continuous use, beyond the confines of traditional hospital or laboratory facilities. The most well-developed component technologies are, however, broadly available only in hard, planar formats. As a result, existing options in system design are unable to effectively accommodate integration with the soft, textured, curvilinear, and time-dynamic surfaces of the skin. Here, we describe experimental and theoretical approaches for using ideas in soft microfluidics, structured adhesive surfaces, and controlled mechanical buckling to achieve ultralow modulus, highly stretchable systems that incorporate assemblies of high-modulus, rigid, state-of-the-art functional elements. The outcome is a thin, conformable device technology that can softly laminate onto the surface of the skin to enable advanced, multifunctional operation for physiological monitoring in a wireless mode.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Sheng -- Zhang, Yihui -- Jia, Lin -- Mathewson, Kyle E -- Jang, Kyung-In -- Kim, Jeonghyun -- Fu, Haoran -- Huang, Xian -- Chava, Pranav -- Wang, Renhan -- Bhole, Sanat -- Wang, Lizhe -- Na, Yoon Joo -- Guan, Yue -- Flavin, Matthew -- Han, Zheshen -- Huang, Yonggang -- Rogers, John A -- New York, N.Y. -- Science. 2014 Apr 4;344(6179):70-4. doi: 10.1126/science.1250169.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24700852" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Elasticity ; Electrocardiography/instrumentation/methods ; Electrocardiography, Ambulatory/instrumentation/methods ; Electroencephalography/instrumentation/methods ; Electromyography/instrumentation/methods ; Electrooculography ; Equipment Design ; Humans ; Male ; Microfluidics/*instrumentation ; Monitoring, Ambulatory/*instrumentation/methods ; Monitoring, Physiologic/*instrumentation/methods ; Remote Sensing Technology ; Silicone Elastomers ; *Skin ; Wireless Technology ; Young Adult
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2021-05-19
    Description: Se elaboraron películas a partir de disoluciones a 3 % (m/v) de quitosana en ácido láctico a 1% (v/v), empleando glicerina, sorbitol o polietilenglicol como plastificante en concentraciones de 0,25 a 0,50 mL/g de quitosana. Se midieron el esfuerzo tensil, elongación, fuerza de ruptura, deformación y el espesor de las películas, con el objetivo de evaluar la influencia de la masa molar y concentración de plastificante sobre sus propiedades mecánicas. Se obtuvieron los modelos matemáticos que relacionan estos factores. Las películas con polietilenglicol, presentaron mayor esfuerzo tensil y fuerza de ruptura normalizada que las plastificadas con glicerina o sorbitol, pero resultaron menos elásticas y deformables, además, mientras mayor fue la concentración de plastificante, más elásticas resultaron las películas y menor fue el esfuerzo necesario para su rup- tura.
    Description: Films were obtained preparing 3% (w/v) chitosan solutions in 1% (v/v) lactic acid using glycerol, sorbitol or polyethylene glycol at 0.25 to 0.50 mL/g of polymer as plasticizers. Film thickness, tensile strength, force at break, deformation and elongation were measured in order to evaluate the effect of molar mass and plasticizers concentration on mechanical properties values. Mathematical models with these factors were proposed. Films with polyethylene glycol had higher tensile strength and normalized force at break than those which glycerol or sorbitol, but less elongation or normalized deformation. In addition, the films were more elastic and with lesser force at break with the increase of plasticizer concentration.
    Description: Published
    Description: plasticizer
    Description: edible film
    Keywords: Chitosan ; Biopolymers ; Elasticity ; Mechanical properties
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 6
    facet.materialart.
    Unknown
    In:  ???
    Publication Date: 2013
    Description: Simulationen mithilfe des Models 4C zu möglichen Auswirkungen der Klimaänderungen des RCP 8.5 Klimaszenariums auf Wälder in Deutschland Kiefer Fichte Eiche Buche KATASTER-BESCHREIBUNG: Auswirkungen des Klimawandels (Temperatur, Niederschlag, CO2-Gehalt der Atmosphäre) auf die Wälder KATASTER-DETAIL: Delta T (Frühjahr) + und Delta Nied (Frühjahr) -, dann Produktivität der Wälder -; Delta C02 + um 25 - 30 %, dann Produktion der Wälder + um 9 - 20%; Delta T + (an nicht wasserlimitierten Standorten), dann Produktivität der Wälder +; Delta CO2+, dann Wassernutzungseffizienz der Wälder +; Delta T (Sommer) +, dann Waldbrandgefahr +; Delta T (Sommer) + und Delta Nied (Sommer) - (= WaBi -), dann Trockenstress der Wälder + um bis zu 9% und dann Produktivität der Wälder -; Delta T (Sommer) + und Delta Nied (Sommer) -, dann Populationsdichte Kiefern-Großschädlinge +;
    Keywords: Deutschland ; 20. und 21. Jahrhundert ; Boden ; Buche ; Eiche ; Fichte ; Forst ; Kiefer ; Klima ; Niederschlag ; Pflanzenschädling ; Phänologie ; Sturmschaden ; Temperatur ; Trockenheit ; Verdunstung ; Waldbrand ; Waldwachstum ; Wassermangel ; Wind ; Grundwasser ; Modell
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  • 7
    Publication Date: 2013
    Description: Ergebnisse aus Berechnungen mit den hydrologischen Modellen HBV-light und WaSiM-ETH angetrieben von den regionalen Klimamodellen (RCM) STAR (+2K, 100 Realisierungen, statistisch), WettReg2010 (A1B, 10 Realisierungen, statistisch), CCLM (A1B, 2 Realisierungen, dynamisch) und REMO (A1B, 1 Realisierung, dynamisch). Untersucht wurden zum einen die Unsicherheiten bezüglich des Einflusses der RCMs und hydrologischen Modelle auf die Endergebnisse sowie die zukünftige Abflussentwicklung in einem Teileinzugsgebiet der Oberen Spree KATASTER-BESCHREIBUNG: Bei der Betrachtung von langjährigen Abflussmittelwerten trägt die Wahl des RCMs die größte Unsicherheit zur Gesamtbandbreite des Modellensembles bei. Die Ergebnisse der hydrologischen Modelle unterscheiden sich nur geringfügig. Die Vulnerabilität des Einzugsgebiets bezüglich klimatischer Änderungen bleibt unbeantwortet, da zum Teil gegensätzlich Entwicklung der tatsächlichen Verdunstung und des Abflusses simuliert werden aufgrund der unterschiedlichen Niederschlagsentwicklungen der RCM KATASTER-DETAIL: Delta Temp: Alle RCMs (STAR (+2.4 °C), WettReg (+1.9 °C), CCLM (+1.6 °C), REMO (+1.2 °C)) Temperaturanstieg bis 2060 (dynamische RCMs schwächeren Anstieg im Vergleich zu den statistischen RCMs) Delta ETP: Alle RCMs Anstieg der potenziellen Verdunstung (ETP, Ansatz: Penman-Monteith). Statistische Modelle deutlich stärkeren Anstieg aufgrund geringerer Luftfeuchte und stärkeren Anstieg der Globalstrahlung (STAR: +135 mm/a, WettReg: +171 mm/a) im Vergleich zu den dynamischen RCMs (REMO: +12 mm/a, CCLM: +40 mm/a); Delta Nied: dynamische RCMs berechnen im Mittel leichten Anstieg (REMO: +38 mm/a, CCLM: +1 mm/a), statistische RCMs im Mittel erheblichen Rückgang (STAR: 120 mm/a, WettReg: 105 mm/a); Delta Tatsächliche Verdunstung: dynamische RCMs leichten Anstieg (REMO: zwischen +7-+18 mm/a, CCLM: zwischen +4-+10 mm/a, je nach hydrologischem Modell), statistische RCMs leichten Rückgang (STAR: zwischen -12 - -22 mm/a, WettReg: zwischen -2 - -10 mm/a, je nach hydrologischem Modell)
    Keywords: Lausitz, Nordostdeutschland ; 2031-2060 ; Klima ; Niederschlag ; Temperatur ; Verdunstung ; Globalstrahlung ; Sonnenscheindauer ; Niedrigwasser ; Abfluss ; Grundwasser ; Modell
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  • 8
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2013-01-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jonietz, Erika -- England -- Nature. 2012 Nov 22;491(7425):S56-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23320288" target="_blank"〉PubMed〈/a〉
    Keywords: Biomechanical Phenomena ; Biophysics/methods ; Cell Communication ; *Cell Physiological Processes ; Drug Resistance, Neoplasm ; Elasticity ; Hardness ; Humans ; Medical Oncology ; *Models, Biological ; Neoplasm Invasiveness ; Neoplasm Metastasis ; Neoplasms/diagnosis/drug therapy/genetics/*pathology ; Rheology ; Tumor Microenvironment ; Viscosity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2012-09-08
    Description: Hydrogels are used as scaffolds for tissue engineering, vehicles for drug delivery, actuators for optics and fluidics, and model extracellular matrices for biological studies. The scope of hydrogel applications, however, is often severely limited by their mechanical behaviour. Most hydrogels do not exhibit high stretchability; for example, an alginate hydrogel ruptures when stretched to about 1.2 times its original length. Some synthetic elastic hydrogels have achieved stretches in the range 10-20, but these values are markedly reduced in samples containing notches. Most hydrogels are brittle, with fracture energies of about 10 J m(-2) (ref. 8), as compared with approximately 1,000 J m(-2) for cartilage and approximately 10,000 J m(-2) for natural rubbers. Intense efforts are devoted to synthesizing hydrogels with improved mechanical properties; certain synthetic gels have reached fracture energies of 100-1,000 J m(-2) (refs 11, 14, 17). Here we report the synthesis of hydrogels from polymers forming ionically and covalently crosslinked networks. Although such gels contain approximately 90% water, they can be stretched beyond 20 times their initial length, and have fracture energies of approximately 9,000 J m(-2). Even for samples containing notches, a stretch of 17 is demonstrated. We attribute the gels' toughness to the synergy of two mechanisms: crack bridging by the network of covalent crosslinks, and hysteresis by unzipping the network of ionic crosslinks. Furthermore, the network of covalent crosslinks preserves the memory of the initial state, so that much of the large deformation is removed on unloading. The unzipped ionic crosslinks cause internal damage, which heals by re-zipping. These gels may serve as model systems to explore mechanisms of deformation and energy dissipation, and expand the scope of hydrogel applications.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3642868/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3642868/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, Jeong-Yun -- Zhao, Xuanhe -- Illeperuma, Widusha R K -- Chaudhuri, Ovijit -- Oh, Kyu Hwan -- Mooney, David J -- Vlassak, Joost J -- Suo, Zhigang -- R01 DE013033/DE/NIDCR NIH HHS/ -- R37 DE013033/DE/NIDCR NIH HHS/ -- England -- Nature. 2012 Sep 6;489(7414):133-6. doi: 10.1038/nature11409.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22955625" target="_blank"〉PubMed〈/a〉
    Keywords: Acrylic Resins/chemistry ; Alginates/chemistry ; Carbohydrate Sequence ; Elasticity ; Glucuronic Acid/chemistry ; Hexuronic Acids/chemistry ; Hydrogels/chemical synthesis/*chemistry ; Materials Testing ; Molecular Sequence Data ; Polymers/chemical synthesis/chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2012-02-03
    Description: Natural materials are renowned for exquisite designs that optimize function, as illustrated by the elasticity of blood vessels, the toughness of bone and the protection offered by nacre. Particularly intriguing are spider silks, with studies having explored properties ranging from their protein sequence to the geometry of a web. This material system, highly adapted to meet a spider's many needs, has superior mechanical properties. In spite of much research into the molecular design underpinning the outstanding performance of silk fibres, and into the mechanical characteristics of web-like structures, it remains unknown how the mechanical characteristics of spider silk contribute to the integrity and performance of a spider web. Here we report web deformation experiments and simulations that identify the nonlinear response of silk threads to stress--involving softening at a yield point and substantial stiffening at large strain until failure--as being crucial to localize load-induced deformation and resulting in mechanically robust spider webs. Control simulations confirmed that a nonlinear stress response results in superior resistance to structural defects in the web compared to linear elastic or elastic-plastic (softening) material behaviour. We also show that under distributed loads, such as those exerted by wind, the stiff behaviour of silk under small deformation, before the yield point, is essential in maintaining the web's structural integrity. The superior performance of silk in webs is therefore not due merely to its exceptional ultimate strength and strain, but arises from the nonlinear response of silk threads to strain and their geometrical arrangement in a web.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cranford, Steven W -- Tarakanova, Anna -- Pugno, Nicola M -- Buehler, Markus J -- England -- Nature. 2012 Feb 1;482(7383):72-6. doi: 10.1038/nature10739.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22297972" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomechanical Phenomena ; Elasticity ; Hardness ; Models, Biological ; Silk/*chemistry ; *Spiders/physiology ; *Tensile Strength ; Wind
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    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 11
    Publication Date: 2012-03-17
    Description: Various plants and fungi have evolved ingenious devices to disperse their spores. One such mechanism is the cavitation-triggered catapult of fern sporangia. The spherical sporangia enclosing the spores are equipped with a row of 12 to 13 specialized cells, the annulus. When dehydrating, these cells induce a dramatic change of curvature in the sporangium, which is released abruptly after the cavitation of the annulus cells. The entire ejection process is reminiscent of human-made catapults with one notable exception: The sporangia lack the crossbar that arrests the catapult arm in its returning motion. We show that much of the sophistication and efficiency of the ejection mechanism lies in the two very different time scales associated with the annulus closure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Noblin, X -- Rojas, N O -- Westbrook, J -- Llorens, C -- Argentina, M -- Dumais, J -- New York, N.Y. -- Science. 2012 Mar 16;335(6074):1322. doi: 10.1126/science.1215985.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universite de Nice Sophia Antipolis (UNS), Laboratoire de Physique de la Matiere Condensee, CNRS UMR 7336, Nice, France. xavier.noblin@unice.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22422975" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Shape ; Elasticity ; Polypodium/cytology/*physiology ; Sporangia/cytology/*physiology ; Spores/*physiology ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 12
    Publication Date: 2012-03-03
    Description: Although genetic control of morphogenesis is well established, elaboration of complex shapes requires changes in the mechanical properties of cells. In plants, the first visible sign of leaf formation is a bulge on the flank of the shoot apical meristem. Bulging results from local relaxation of cell walls, which causes them to yield to internal hydrostatic pressure. By manipulation of tissue tension in combination with quantitative live imaging and finite-element modeling, we found that the slow-growing area at the shoot tip is substantially strain-stiffened compared with surrounding fast-growing tissue. We propose that strain stiffening limits growth, restricts organ bulging, and contributes to the meristem's functional zonation. Thus, mechanical signals are not just passive readouts of gene action but feed back on morphogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kierzkowski, Daniel -- Nakayama, Naomi -- Routier-Kierzkowska, Anne-Lise -- Weber, Alain -- Bayer, Emmanuelle -- Schorderet, Martine -- Reinhardt, Didier -- Kuhlemeier, Cris -- Smith, Richard S -- New York, N.Y. -- Science. 2012 Mar 2;335(6072):1096-9. doi: 10.1126/science.1213100.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Plant Sciences, University of Bern, Bern, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22383847" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Wall/physiology/ultrastructure ; Elasticity ; Hydrostatic Pressure ; Lycopersicon esculentum/cytology/*growth & development ; Meristem/cytology/*growth & development ; Models, Biological ; *Morphogenesis ; Osmolar Concentration ; Osmotic Pressure ; Plant Shoots/cytology/*growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 13
    Publication Date: 2022-05-25
    Description: Author Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 1036–1052, doi:10.1890/04-0434.
    Description: Boltonia decurrens is an endangered plant restricted to the Illinois River Valley. Its complex life cycle has evolved in response to the dynamics of the historic flood regime, which has changed dramatically in the last century due to the construction of navigation dams and agricultural levees. To explore the effects of these changes, we developed deterministic and stochastic matrix population models of the demography of Boltonia. We used periodic matrix models to incorporate intra-annual seasonal variation. We estimated parameters as a function of the timing of spring flood recession (early or late) and of growing season precipitation (high or low). Late floods and/or low precipitation reduce population growth (λ). Early floods and high precipitation lead to explosive population growth. Elasticity analysis shows that changes in floods and precipitation alter the life history pathways responsible for population growth, from annual to biennial and eventually clonal pathways. We constructed and analyzed a stochastic model in which flood timing and precipitation vary independently, and we computed the stochastic growth rate (log λs) and the variance growth rate (σ2) as functions of the frequency of late floods and low precipitation. Using historical data on floods and rainfall over the last 100 years, we found that log λs has declined as a result of hydrological changes accompanying the regulation of the river. Stochastic elasticity analysis showed that over that time the contribution of annual life history pathways to log λs has declined as the contributions of biennial and clonal pathways have increased. Over the same time period, σ2 has increased, in agreement with observations of large fluctuations in local B. decurrens populations. Undoubtedly, many plant and animal species evolved in concert with dynamic habitats and are now threatened by anthropogenic changes in those dynamics. The data and analyses used in this study can be applied to management and development strategies to preserve other dynamic systems.
    Description: This work was supported by grants to M. Smith from NSF (DEB 9509763, DED 9321517), USACE, Illinois Groundwater Consortium and USFWS, and an EPA STAR grant (U- 91578101-2) to P. Mettler. H. Caswell also received support from NSF grant OCE-9983976 and EPA grant R-82908901, and a Maclaurin Fellowship from the New Zealand Institute of Mathematics and its Applications.
    Keywords: Boltonia decurrens ; Conservation ; Elasticity ; Floodplain ; Flood regime ; LTRE ; Matrix population model ; Periodic matrix model ; Stochastic elasticity ; Stochastic environment ; Stochastic matrix model ; Threatened species
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 14
    Publication Date: 2022-05-25
    Description: Author Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 2097–2108, doi:10.1890/04-1762.
    Description: We investigated the effects of fire on population growth rate and invasive spread of the perennial tussock grass Molinia caerulea. During the last decades, this species has invaded heathland communities in Western Europe, replacing typical heathland species such as Calluna vulgaris and Erica tetralix. M. caerulea is considered a major threat to heathland conservation. In 1996, a large and unintended fire destroyed almost one-third of the Kalmthoutse Heide, a large heathland area in northern Belgium. To study the impact of this fire on the population dynamics and invasive spread of M. caerulea, permanent monitoring plots were established both in burned and unburned heathland. The fate of each M. caerulea individual in these plots was monitored over four years (1997–2000). Patterns of seed dispersal were inferred from a seed germination experiment using soil cores sampled one month after seed rain at different distances from seed-producing plants. Based on these measures, we calculated projected rates of spread for M. caerulea in burned and unburned heathland. Elasticity and sensitivity analyses were used to determine vital rates that contributed most to population growth rate, and invasion speed. Invasion speed was, on average, three times larger in burned compared to unburned plots. Dispersal distances on the other hand, were not significantly different between burned and unburned plots indicating that differences in invasive spread were mainly due to differences in demography. Elasticities for fecundity and growth of seedlings and juveniles were higher for burned than for unburned plots, whereas elasticities for survival were higher in unburned plots. Finally, a life table response experiment (LTRE) analysis revealed that the effect of fire was mainly contributed by increases in sexual reproduction (seed production and germination) and growth of seedlings and juveniles. Our results clearly showed increased invasive spread of M. caerulea after fire, and call for active management guidelines to prevent further encroachment of the species and to reduce the probability of large, accidental fires in the future. Mowing of resprouted plants before flowering is the obvious management tactic to halt massive invasive spread of the species after fire.
    Description: This work was supported by the Flemish Fund for Scientific Research (FWO) to HJ, the U.S. National Science foundation (DEB-0235692, OCE-0083976), and the U.S. Environmental Protection Agency (R-8290891) to MGN.
    Keywords: Disturbance ; Elasticity ; Fire ; Integrodifference equations ; Invasive spread ; LTRE ; Matrix population model ; Molinia caerulea ; Sensitivity
    Repository Name: Woods Hole Open Access Server
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  • 15
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    In:  Journal of Agricultural Science, Volume: 149, p.33-47
    Publication Date: 2011
    Description: Verwendung eines gemischten Regressionsmodels für die Vorhersage der Kornernte unter fünf Klimaszenarien für zwei Bodentypen (sandige und lehmige Böden) und zwei Regionen in Dänemark (West Zealand und Central Jutland). KATASTER-BESCHREIBUNG: Auswirkung von Änderungen im Klima (Temperatur und Strahlung) auf die Ernteerträge von Getreide. Im Durchschnitt nehmen die Erträge unter den projizierten Klimaänderungen um 1.6-12.3% ab. Die durchschnittliche Abnahme bis 2020 beträgt 3.6% verglichen zum Jahr 1985 und 8.0% bis 2040. Die Abnahme ist für West Zealand größer als für Central Jutland und für lehmige Böden größer als für sandige Böden. KATASTER-DETAIL: Delta T (Sommer) +, dann Erträge -; Delta Sonn (Sommer, Frühling) +, dann Erträge +; Delta T (Winter) = 4,4°C, dann Erträge = max; Delta T (Winter) 〉/〈 4,4°C, dann Erträge -;
    Keywords: Dänemark ; 1992-2008, 2020, 2040 ; Ertrag ; Getreide ; Klima ; Niederschlag ; Temperatur ; Sonnenscheindauer ; Modell
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  • 16
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    In:  DGG-Proceedings, Vol. 1, No. 3, p. 1-5. DOI: 10.5288/dgg-pr-01-03-hh-2011
    Publication Date: 2011
    Description: Modifizierte Wasserhaushalts- und Ertragsmodell SIMWASER wurde genutzt, um auf der Grundlage von Klimaszenarien zukünftige Apfelerträge an der Niederelbe abzuschätzen. KATASTER-BESCHREIBUNG: ECHAM5/ OM IPCC, Szenariolauf 1, WETTREG Klimaszenarien A1B und B1, Eingang in das Regressionsmodell fanden das Vorerntejahr (*) die Sonnenscheindauer von April-Juni [Sd(04-06)*], Minimumtemperatur im November [Tn(11)*], Sonnenscheindauern im März/April [Sd(0304)] und im Mai/Juni [Sd(0506)] und die Niederschlagshöhe im Juli des Erntejahres [P07] Modellrechnungen ergeben bis zum Ende des 21.Jahrhunderts Veränderungen der phänologischen Phasen sowie der Apfelerträge.Insbesondere die signifikante Verkürzung der Periode BBCH[61-87] (p〈0.01) um 28(Szenario A1B) bzw. 19 Tage (Szenario B1) bis zum Ende des 21. Jahrhunderts ist vermutlich der maßgebliche Faktor für die signifikante Abnahme der Erträge um ca. 7 % an der Niederelbe bei sonst gleichbleibenden Rahmenbedingungen. KATASTER-DETAIL: Anomalie (yi in Prozent) der beobachteten Erträge (xoy) zum linearen Ertragstrend (xlyt) bestimmt: yi = (xoy)i / (xlyt)i Ertagsabweichung delta-y = 0.805679 + 0.00103065 Sd(04-06)* - 0.0468646 Tn11* - 0.00110369 Sd(0304) + 0.00031381 Sd(0506) - 0.00153245 P07
    Keywords: Niedersachsen ; 1973-2006 und Szenarium von 2001-2100 ; Apfel ; Ertrag ; Niederschlag ; Vegetationsperiode ; Sonnenscheindauer
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  • 17
    Publication Date: 2011
    Description: Ermittlung der Wettervariablen mit dem höchsten Risikoausgleichspotential an 13 untersuchten Standorten KATASTER-BESCHREIBUNG: Korrelation von Temperatur, Niederschlag und Sonnenscheinstungen und Zuckerertrag in Norddeutschland KATASTER-DETAIL: Korrelationskoeffizienten von 0,756 bei der Temperatur, einen Wert von -0,845 beim Niederschlag und einen Korrelationskoeffizienten bei den Sonnenstunden von 0,846
    Keywords: Norddeutschland ; 2001 - 2010 ; Zuckerrüben ; Ertrag ; Niederschlag ; Temperatur ; Sonnenscheindauer
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  • 18
    Publication Date: 2011-09-24
    Description: We studied the mechanical process of seed pods opening in Bauhinia variegate and found a chirality-creating mechanism, which turns an initially flat pod valve into a helix. We studied con fi gurations of strips cut from pod valve tissue and from composite elastic materials that mimic its structure. The experiments reveal various helical con fi gurations with sharp morphological transitions between them. Using the mathematical framework of "incompatible elasticity," we modeled the pod as a thin strip with a flat intrinsic metric and a saddle-like intrinsic curvature. Our theoretical analysis quantitatively predicts all observed con fi gurations, thus linking the pod's microscopic structure and macroscopic conformation. We suggest that this type of incompatible strip is likely to play a role in the self-assembly of chiral macromolecules and could be used for the engineering of synthetic self-shaping devices.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Armon, Shahaf -- Efrati, Efi -- Kupferman, Raz -- Sharon, Eran -- New York, N.Y. -- Science. 2011 Sep 23;333(6050):1726-30. doi: 10.1126/science.1203874.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21940888" target="_blank"〉PubMed〈/a〉
    Keywords: Bauhinia/*anatomy & histology/physiology ; Biomimetic Materials ; Elasticity ; *Latex ; Mathematical Concepts ; Models, Biological ; Physical Phenomena ; Seeds/*anatomy & histology/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 19
    Publication Date: 2011-03-18
    Description: Inelastic light scattering spectroscopy has, since its first discovery, been an indispensable tool in physical science for probing elementary excitations, such as phonons, magnons and plasmons in both bulk and nanoscale materials. In the quantum mechanical picture of inelastic light scattering, incident photons first excite a set of intermediate electronic states, which then generate crystal elementary excitations and radiate energy-shifted photons. The intermediate electronic excitations therefore have a crucial role as quantum pathways in inelastic light scattering, and this is exemplified by resonant Raman scattering and Raman interference. The ability to control these excitation pathways can open up new opportunities to probe, manipulate and utilize inelastic light scattering. Here we achieve excitation pathway control in graphene with electrostatic doping. Our study reveals quantum interference between different Raman pathways in graphene: when some of the pathways are blocked, the one-phonon Raman intensity does not diminish, as commonly expected, but increases dramatically. This discovery sheds new light on the understanding of resonance Raman scattering in graphene. In addition, we demonstrate hot-electron luminescence in graphene as the Fermi energy approaches half the laser excitation energy. This hot luminescence, which is another form of inelastic light scattering, results from excited-state relaxation channels that become available only in heavily doped graphene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Chi-Fan -- Park, Cheol-Hwan -- Boudouris, Bryan W -- Horng, Jason -- Geng, Baisong -- Girit, Caglar -- Zettl, Alex -- Crommie, Michael F -- Segalman, Rachel A -- Louie, Steven G -- Wang, Feng -- England -- Nature. 2011 Mar 31;471(7340):617-20. doi: 10.1038/nature09866. Epub 2011 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21412234" target="_blank"〉PubMed〈/a〉
    Keywords: Elasticity ; Electrons ; Graphite/*chemistry ; *Light ; Luminescence ; Photons ; *Quantum Theory ; *Scattering, Radiation ; Spectrum Analysis, Raman ; Static Electricity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 20
    Publication Date: 2011-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huck, Wilhelm T S -- England -- Nature. 2011 Apr 28;472(7344):425-6. doi: 10.1038/472425a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21525922" target="_blank"〉PubMed〈/a〉
    Keywords: Biosensing Techniques ; Drug Delivery Systems ; Elasticity ; Elastomers/chemistry ; Molecular Conformation/radiation effects ; Pliability ; Polymers/*chemistry/*radiation effects ; Tissue Engineering
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 21
    Publication Date: 2011-08-05
    Description: The developing vertebrate gut tube forms a reproducible looped pattern as it grows into the body cavity. Here we use developmental experiments to eliminate alternative models and show that gut looping morphogenesis is driven by the homogeneous and isotropic forces that arise from the relative growth between the gut tube and the anchoring dorsal mesenteric sheet, tissues that grow at different rates. A simple physical mimic, using a differentially strained composite of a pliable rubber tube and a soft latex sheet is consistent with this mechanism and produces similar patterns. We devise a mathematical theory and a computational model for the number, size and shape of intestinal loops based solely on the measurable geometry, elasticity and relative growth of the tissues. The predictions of our theory are quantitatively consistent with observations of intestinal loops at different stages of development in the chick embryo. Our model also accounts for the qualitative and quantitative variation in the distinct gut looping patterns seen in a variety of species including quail, finch and mouse, illuminating how the simple macroscopic mechanics of differential growth drives the morphology of the developing gut.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3335276/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3335276/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Savin, Thierry -- Kurpios, Natasza A -- Shyer, Amy E -- Florescu, Patricia -- Liang, Haiyi -- Mahadevan, L -- Tabin, Clifford J -- R01 HD047360/HD/NICHD NIH HHS/ -- R01 HD047360-07/HD/NICHD NIH HHS/ -- England -- Nature. 2011 Aug 3;476(7358):57-62. doi: 10.1038/nature10277.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21814276" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomechanical Phenomena ; Chick Embryo ; Computer Simulation ; Elasticity ; Female ; Finches/embryology ; Intestines/*anatomy & histology/*embryology ; Mesentery/anatomy & histology/embryology ; Mice ; *Models, Anatomic ; *Models, Biological ; Quail/embryology ; Rotation ; Rubber
    Print ISSN: 0028-0836
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 22
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    Nature Publishing Group (NPG)
    Publication Date: 2011-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hersen, Pascal -- Ladoux, Benoit -- England -- Nature. 2011 Feb 17;470(7334):340-1. doi: 10.1038/470340a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21331032" target="_blank"〉PubMed〈/a〉
    Keywords: Biomechanical Phenomena ; Cell Adhesion/physiology ; Cell Movement/*physiology ; Dictyostelium/*cytology ; Elasticity ; Single-Cell Analysis/*methods
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 23
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2011-09-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forterre, Yoel -- Dumais, Jacques -- New York, N.Y. -- Science. 2011 Sep 23;333(6050):1715-6. doi: 10.1126/science.1210734.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉IUSTI, CNRS, Aix-Marseille Universite, 13453 Marseille Cedex 13, France. yoel.forterre@polytech.univ-mrs.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21940886" target="_blank"〉PubMed〈/a〉
    Keywords: Bauhinia/*anatomy & histology ; Biomimetic Materials ; Elasticity ; Seeds/*anatomy & histology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 24
    Publication Date: 2022-05-26
    Description: Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 112 (2007): B04106, doi:10.1029/2006JB004484.
    Description: The mechanical behavior of hydrate-bearing sediments subjected to large strains has relevance for the stability of the seafloor and submarine slopes, drilling and coring operations, and the analysis of certain small-strain properties of these sediments (for example, seismic velocities). This study reports on the results of comprehensive axial compression triaxial tests conducted at up to 1 MPa confining pressure on sand, crushed silt, precipitated silt, and clay specimens with closely controlled concentrations of synthetic hydrate. The results show that the stress-strain behavior of hydrate-bearing sediments is a complex function of particle size, confining pressure, and hydrate concentration. The mechanical properties of hydrate-bearing sediments at low hydrate concentration (probably 〈 40% of pore space) appear to be determined by stress-dependent soil stiffness and strength. At high hydrate concentrations (〉50% of pore space), the behavior becomes more independent of stress because the hydrates control both stiffness and strength and possibly the dilative tendency of sediments by effectively increasing interparticle coordination, cementing particles together, and filling the pore space. The cementation contribution to the shear strength of hydrate-bearing sediments decreases with increasing specific surface of soil minerals. The lower the effective confining stress, the greater the impact of hydrate formation on normalized strength.
    Description: This research was sponsored by a contract to C.R. and J.C.S. from the Joint Industry Project for Methane Hydrate, administered by ChevronTexaco with funding from award DE-FC26- 01NT41330 from DOE’s National Energy Technology Laboratory. The Goizueta Foundation at Georgia Tech also provided support for this work. The research was completed while C.R. was on assignment at and wholly supported by the National Science Foundation (NSF).
    Keywords: Gas hydrate ; Sediment strength ; Elasticity ; Mechanical behavior ; Stiffness
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 25
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    Unknown
    In:  Münster: proPlant GmbH. http://www.proplant.de/data/2010/ 2010_12_Volk-Richthofen-Johnen_Abschlussbericht- Klimawandel-und-Pflanzenschutz_proPlant.pdf
    Publication Date: 2010
    Description: Infektionsrisiko für pilzliche, bakterielle und tierische Schädlinge bei Weizen, Winterraps, Kartoffeln, Zuckerrüben und Mais werden für das Szenario A1B abgeschätzt KATASTER-BESCHREIBUNG: Schwerpunkt auf den 8 bedeutensten Krankheiten bei Weizen, Halmbruch, Mehltau, Septoria-Blattdürre, Gelbrost, Braunrost, DTR-Blattdürre, Septoria nodorum und Fusarium, Simulationen mit proPlant.expert und Einteilung in Trendklassen (1-5) von linearer Trend ansteigend (=1) bis abnehmend (=5) KATASTER-DETAIL: Tmit+ (Wettreg 2006, A1B), dann ansteigendes Risiko für Septoria tritici, Braunrost, Mehltau, Fusarium, für Halmbruch und DTR kein ansteigendes Risiko ermittelt Detaillierte Trendübersicht und Beurteilung für einzelne Kulturen und Regionen in NRW siehe Dokument, Anhang
    Keywords: Nordrhein-Westfalen ; 2001-2050 ; Insekten ; Zuckerrüben ; Kartoffeln ; Infektionskrankheiten ; Landwirtschaft ; Mais ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Temperatur ; Weizen ; Raps ; Modell
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  • 26
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    In:  Internes Arbeitsmaterial des PIK, .... fs01/guests\Martin.Wodinski\PIK-COLLECTION\SLIDES-POOL\RD2\
    Publication Date: 2010
    Description: Kalkulation der Klimatischen Wasserbilanz (mm) anhand es PIK/DWD Datensatzes für 1951-2006 im Jahr, und für den Zeitraum 2051-60, Szenario A1B, als Mittel und Differenzkarten KATASTER-BESCHREIBUNG: Jährliche Klimatischen Wasserbilanz WABI (Niederschlag - pot. Verdunstung nach Turc-Ivanov) für Deutschland KATASTER-DETAIL: Zu- bzw. Abnahme der (WABI) 2051-2060 vs. 1951-2006 von 200 - (-100) im Westen der BRD, in Ostdeutschland stärkere, einheitliche Abnahme der WABI um bis zu 300mmm
    Keywords: Deutschland ; 1951-2006, 2051-60 ; Niederschlag ; Temperatur ; Witterungsextreme
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  • 27
    Publication Date: 2010-05-07
    Description: The passive elasticity of muscle is largely governed by the I-band part of the giant muscle protein titin, a complex molecular spring composed of a series of individually folded immunoglobulin-like domains as well as largely unstructured unique sequences. These mechanical elements have distinct mechanical properties, and when combined, they provide the desired passive elastic properties of muscle, which are a unique combination of strength, extensibility and resilience. Single-molecule atomic force microscopy (AFM) studies demonstrated that the macroscopic behaviour of titin in intact myofibrils can be reconstituted by combining the mechanical properties of these mechanical elements measured at the single-molecule level. Here we report artificial elastomeric proteins that mimic the molecular architecture of titin through the combination of well-characterized protein domains GB1 and resilin. We show that these artificial elastomeric proteins can be photochemically crosslinked and cast into solid biomaterials. These biomaterials behave as rubber-like materials showing high resilience at low strain and as shock-absorber-like materials at high strain by effectively dissipating energy. These properties are comparable to the passive elastic properties of muscles within the physiological range of sarcomere length and so these materials represent a new muscle-mimetic biomaterial. The mechanical properties of these biomaterials can be fine-tuned by adjusting the composition of the elastomeric proteins, providing the opportunity to develop biomaterials that are mimetic of different types of muscles. We anticipate that these biomaterials will find applications in tissue engineering as scaffold and matrix for artificial muscles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lv, Shanshan -- Dudek, Daniel M -- Cao, Yi -- Balamurali, M M -- Gosline, John -- Li, Hongbin -- Canadian Institutes of Health Research/Canada -- England -- Nature. 2010 May 6;465(7294):69-73. doi: 10.1038/nature09024.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20445626" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biocompatible Materials/chemical synthesis/*chemistry ; Biomechanical Phenomena ; Biomimetics/methods ; Biopolymers/*chemistry ; Connectin ; Drosophila melanogaster/genetics ; Elasticity ; Muscle Proteins/*chemistry ; Polyproteins/chemistry ; Protein Kinases/*chemistry ; Stress, Mechanical
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 28
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    Nature Publishing Group (NPG)
    Publication Date: 2010-05-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chaikof, Elliot L -- England -- Nature. 2010 May 6;465(7294):44-5. doi: 10.1038/465044a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20445620" target="_blank"〉PubMed〈/a〉
    Keywords: Biomimetic Materials/*chemistry ; Connectin ; Elasticity ; Muscle Proteins/chemistry ; Polymers/*chemistry ; Protein Kinases/chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 29
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2010-08-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bhatia, Mickie -- New York, N.Y. -- Science. 2010 Aug 27;329(5995):1024-5. doi: 10.1126/science.1194919.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stem Cell and Cancer Research Institute, McMaster University, Hamilton, Ontario L8N 3Z5, Canada. mbhatia@mcmaster.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20798306" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Culture Techniques/*methods ; Cell Differentiation ; Cell Division ; Cells, Cultured ; Elasticity ; Humans ; Hydrogels ; Mice ; Muscle Fibers, Skeletal/*cytology/physiology ; Myoblasts, Skeletal/cytology/physiology ; Regeneration ; Stem Cell Niche/*physiology ; Stem Cell Transplantation ; Stem Cells/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Publication Date: 2010-08-07
    Description: Using optical trapping and fluorescence imaging techniques, we measured the step size and stiffness of single skeletal myosins interacting with actin filaments and arranged on myosin-rod cofilaments that approximate myosin mechanics during muscle contraction. Stiffness is dramatically lower for negatively compared to positively strained myosins, consistent with buckling of myosin's subfragment 2 rod domain. Low stiffness minimizes drag of negatively strained myosins during contraction at loaded conditions. Myosin's elastic portion is stretched during active force generation, reducing apparent step size with increasing load, even though the working stroke is approximately constant at about 8 nanometers. Taking account of the nonlinear nature of myosin elasticity is essential to relate myosin's internal structural changes to physiological force generation and filament sliding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaya, Motoshi -- Higuchi, Hideo -- New York, N.Y. -- Science. 2010 Aug 6;329(5992):686-9. doi: 10.1126/science.1191484.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyou-ku, Tokyo, 113-0033 Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20689017" target="_blank"〉PubMed〈/a〉
    Keywords: Actin Cytoskeleton/*physiology ; Actomyosin/chemistry/physiology ; Adenosine Diphosphate/metabolism ; Adenosine Triphosphate/metabolism ; Animals ; Compliance ; Elasticity ; Models, Biological ; *Muscle Contraction ; Muscle Fibers, Skeletal/chemistry/physiology ; Muscle, Skeletal ; Myosin Subfragments/physiology ; Myosins/chemistry/*physiology ; Quantum Dots ; Rabbits
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2010-03-27
    Description: Recent advances in mechanics and materials provide routes to integrated circuits that can offer the electrical properties of conventional, rigid wafer-based technologies but with the ability to be stretched, compressed, twisted, bent, and deformed into arbitrary shapes. Inorganic and organic electronic materials in microstructured and nanostructured forms, intimately integrated with elastomeric substrates, offer particularly attractive characteristics, with realistic pathways to sophisticated embodiments. Here, we review these strategies and describe applications of them in systems ranging from electronic eyeball cameras to deformable light-emitting displays. We conclude with some perspectives on routes to commercialization, new device opportunities, and remaining challenges for research.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rogers, John A -- Someya, Takao -- Huang, Yonggang -- New York, N.Y. -- Science. 2010 Mar 26;327(5973):1603-7. doi: 10.1126/science.1182383.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, IL 61801, USA. jrogers@illinois.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20339064" target="_blank"〉PubMed〈/a〉
    Keywords: Biocompatible Materials ; Diagnostic Equipment ; Elasticity ; Elastomers ; *Electrical Equipment and Supplies ; Equipment Design ; Humans ; Mechanical Phenomena ; Nanostructures ; *Semiconductors ; Therapeutics/instrumentation
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    Notes: A. 1.Gelegentlich der Besprechung der Reaktionsgeschwindigkeit in Gasen wird das Wesen der Quantentheorie anläßlich der NERNST-schen Konstanten als bedingt erkannt durch Stufung der Raumerfüllung, ganz, wie eine natürliche Stufung der Massen  -  in der Existenz der Atome  -  bereits bekannt ist.
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    Notes: Von der Vorstellung ausgehend, daß das Wasser der hauptsächlichste Mineralisator bei Eruptivgesteinsbildungen sei und das Magma eine wenn auch stark konzentrierte wässerige Lösung, wurden die für die gewöhnlichen wässerigen Lösungen geltenden Prinzipien auf die magmatische Lösung übertragen. Da wir in einer Lösung jeden beliebigen Lösungsgenossen als Lösungsmittel auffassen können, wurden die Mineralisatoren derart betrachtet, daß wir jeden derselben der Reihe nach als Lösungsmittel aufzufassen suchten.
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    Notes: Die über das Vorkommen des primären und sekundären Polyhalits ausgeführten Untersuchungen stimmen mit den Angaben VAN'T HOFFS in vielem überein. Mit Ausnahme der carnallithaltigen Lagerteile kann der Polyhalit, in größeren oder geringeren Mengen, fast in allen kalihaltigen Teilen des älteren Zechsteinsalzlagers angetroffen werden. Als primär abgelagertes Salz tritt er hauptsächlich im stellenweise entwickelten polyhalitischen Steinsalz (Polyhalit-Halit) auf. In der kieseritischen Übergangszone (Hangend-Polyhalit) des Staßfurter Carnallitlagers treffen wir in der Gestalt des Anhydrits, Kieserits, Sylvins und Carnallits bereits nur sekundäre Umwandlungsprodukte dieses primären Polyhalits vor. Es haben eingesickerte Laugen des fortschreitenden Eintrocknungsvorganges, als auch die in der Tiefe erfolgte Einwirkung chlormagnesiagesättigter Laugen des Carnallitgebietes zu diesen Umwandlungsvorgängen beigetragen.
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    Notes: Es wird ein dynamisches Verfahren zur Messung von Dampfdrucken in Kohlerohrwiderstandsofen für Temperaturen über 1200° beschrieben.
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    Notes: Übersicht S.1.- 1. Die regellose Verteilung zweier Molekülarten S.9.-2. Die regelmäßigen Verteilungen zweier Atomarten in Raumgittern S. 15.-3. Die bei der Extraktion mit Salpetersäure verbleibenden Rückstände der Gold - Silber- und Gold -Kupferlegierungen S. 49. - 4. Vorläufige Bestimmung der Einwirkungsgrenzen von schwefelhaltigen Agentien und schwachen Oxydationsmitteln auf die Cu-Au-Mischkristalle und der Einfluß der Temperatur auf diese Einwirkungsgrenzen S. 57 - 5. Genauere Bestimmung der Einwirkungsgrenzen auf die Cu-Au- und Ag-Au-Mischkristalle in Abhängigkeit von der Natur der chemischen Agentien S. 62. - 6. Über die Löslichkeit von Wasserstoff in Palladiummischkristallen S. 89. - 7. Deutung der Einwirkungsgrenzen S. 96. - 8. Das Verhalten der ternären Mischkristalle von Cu, Ag und Au gegen chemische Agentien und ihre Farben S. 107. - 9. Die Einwirkungsgrenzen der Mischkristalle des Vanadins und Siliciums mit Eisen S. 118.-10. Die galvanischen Spannungen der Legierungen S. 136.- 11. Angenäherte Bestimmung der Einwirkungsgrenzen auf die Mischkristallreihen des Mn mit Ag und die des Mg mit Ag S. 169. - 12. Über den Einfluß der Kaltbearbeitung auf die chemischen Einwirkungsgrenzen S. 171. - 13. Zusammenfassung der Resultate, betreffend die Einwirkungsgrenzen und Übersicht ihrer Deutung S. 186. - 14. Über den atomistischen Aufbau nichtmetallischer Mischkristalle S. 186.- 15. Die normale Molekülverteilung in Mischkristallen als Ursache ihrer anomalen Doppelbrechung S. 208. - 16. Isomere metallische Mischkristalle S. 217.-17. Bemerkungen über „Säure“ beständige Legierungen S.235.- Schlußwort S.237.
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    Notes: 1. Es wurden durch Feststellung von p-Linien die Koordinaten der Schmelzkurven von Betol, Triphenylmethan, Erythrit Guajakol, Salol und Benzoesäureanhydrid bestimmt.
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    Notes: A. Es wurden folgende Methoden zur Darstellung des Gadoliniums geprüft: 1Die Alkalidoppelsulfatmethode.Die Methode erweist sich zur Darstellung des Gadoliniums nur bedingt als brauchbar. Ihre unbequeme Handhabung verbietet eine erschöpfende Anwendung zur Darstellung einer Einzelerde. Dagegen vermag sie gut Dienste zu leisten, wenn es sich darum handelt, ein umfangreiches schwachgadoliniumhaltiges Material in zwei Teile zu teilen, in deren einem man das Gadolinium konzentrieren kann.2Die Hydrazindoppelsulfatmethode.Diese Methode wurde neu ausgearbeitet; sie wirkt der Alkalidoppelsulfatemethode analog und in dem gleichen Sinne. Sie hat gegenüber jener den Vorzug, daß man die Menge der abzuscheidenden Erden in der Hand hat.Es werden die Hydrazindoppelsulfate einiger typischer Erden dargestellt und ihre Zusammensetzung durch Analyse ermittelt.3Die fraktionierte Kristallisation der Bromate.Diese von C. James zuerst angegebene Methode eignet sich in hervorragender Weise zur Trennung der Terbinerden von den Yttererden. Die Scheidung verläuft schnell und gestattet das Arbeiten in größtem Maßstabe, infolge der großen Löslichkeit und guten Kristallisationsfähigkeit der Bromate. Man kann jedoch mit ihr keine Trennung der Ceriterden von den Terbinerden erzielen, da die Löslichkeit des Gadoliniumbromats zwischen den Löslichkeiten von Samarium und Neodymbromat liegt. Die Methode muß also mit einer anderen, zur Abscheidung der Ceriterden dienenden verbunden werden.
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    Notes: 1. Aus der Molekulartheorie und Thermodynamik und der Theorie der chemischen Reaktionsgeschwindigkeit werden die Formeln für einen einfachen Grenzfall der letzteren, Verdampfungs- und Kondensationsgeschwindigkeit abgeleitet und gezeigt, wie man beide Größen nach Betrag und Temperaturabhängigkeit berechnen kann bei Kenntnis der Verdampfungs- und Molarwärmen, des Molekulargewichts, des Molekulardurchmessers, der Kondensatdichte und genau genommen der Packungsweise.
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    Zeitschrift für anorganische Chemie 105 (1919), S. 121-144 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden die Entstehungsbedingungen und Eigenschaften der Kohlenarten untersucht, die auf verschiedene Weise aus Graphitsäure erhalten werden. Dabei werden unter „Graphitsäure“ die festen Oxydationsprodukt verstanden, die aus einem reinen, elektrisch gewonnene Graphit mit einer Mischung von Salpetersäure, Schwefelsäure und Chlorat nach einem Normalverfahren erhalten wurden, ohne Rücksicht auf das Stadium der Einwirkung auf den Graphit.
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    Zeitschrift für anorganische Chemie 105 (1919), S. 145-166 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Messungen der Reaktionstensionen, welche bei der Umsetzung von Schwefelblei mit seinen Oxydationsprodukten auftreten, wurden mit Erhitzungsröhrchen aus Calciumphosphat wiederholt. Dadurch werden die Fehler, welche bei der Verwendung von Silikatgefäßen auftreten, vermieden.
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    Zeitschrift für anorganische Chemie 107 (1919), S. 265-307 
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    Zeitschrift für anorganische Chemie 107 (1919), S. 313-316 
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    Zeitschrift für anorganische Chemie 106 (1919), S. 189-208 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 49-69 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 161-183 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 231-247 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 248-266 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 267-272 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 215-225 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Versuche über den Basenaustausch im Permitit wurden fortgesetzt; beim Austausch des Kupfers gegen die Erdalkalien wurde die Unabhängigkeit von der Verdünnung für gleichwertige Ionen neuerdings bestätigt gefunden und gleichzeitig eine analoge Gesetzmäßigkeit im Verhalten der Homologen beim Austausch wie bei den Alkalien festgestellt. An der Reihe Silber-Barium wurde eine Formel für den Austausch zwischen ein- und zweiwertigen ionen erprobt und auch für die Reihe Natrium-Calcium gültig befunden; in dieser Reihe wurde außerdem eine Mischungslücke konstatiert und gezeigt, daß die Umwandlung der beiden festen Phasen  -  mindestens von einer Seite  -  beträchtliche Zeit braucht. Schließlich wurde noch am Austausch Silber-Lanthan gezeigt, daß auch dreiwertige Ionen zum Austausch befähigt sind und daß der Einfluß der Verdünnung hier besonders grß ist.
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    Zeitschrift für anorganische Chemie 109 (1919), S. 52-62 
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    Zeitschrift für anorganische Chemie 109 (1919), S. 63-68 
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    Zeitschrift für anorganische Chemie 109 (1919), S. 126-131 
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    Zeitschrift für anorganische Chemie 109 (1919), S. 111-125 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Aus den Dissoziationsmessungen der Verbindungen von Ammoniak mit Halogeniden der Mangan-, Eisen-, Kobalt-, Nickelreihe wurden nach der genauen Gleichung von NERNST: \documentclass{article}\pagestyle{empty}\begin{document}$$ \log p = - \frac{{Q_0 }}{{4.57{\rm }T}} + 1.75\,{\rm log }\,T + \frac{{\Sigma \nu \beta + \Sigma nb}}{{4.57}} \cdot T + 3.3 $$\end{document} die Werte Q0 und die Koeffizienten von T bestimmt.
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    Zeitschrift für anorganische Chemie 108 (1919), S. 81-110 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. In der vorstehenden Arbeit wird die Frage aufgeworfen, wie genau die Grenzwerte des molaren Leitvermögens μ∞ bei den organischen Ionen bekannt sind. Dieselben wurden bisher aus den bei verschiedenen Verdünnungen (32, 64, 128, 256, 512, 1024) gemessenen Werten des molaren Leitvermögens μ nach der sogen. OSTWALD-BREDIGschen Regel dadurch extrapoliert, daß man nach einer von diesen Forschern gegebenen, auf empirischem Wege gefundenen Tabelle zu jedem Werte von μ ein Zahl addiert and nach der Gleichung \documentclass{article}\pagestyle{empty}\begin{document}$$ \mu _\infty ^ - = \mu + \Delta $$\end{document} den Wert von μ∞ findet.
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    Zeitschrift für anorganische Chemie 108 (1919), S. 113-118 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 184-190 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 226-230 
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    Zeitschrift für anorganische Chemie 108 (1919), S. 273-302 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: Aus den vorhergehenden Berechnungen ergeben sich folgende Zusammenstellungen im Vergleich mit der von HABER in der Zeitschrift für Elektrochemie 1914, 603 angegebenen Tabelle 4, welche sämtliche Ergebnisse von ihm und seinen Mitarbeitern zusammenfaßt.
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    Zeitschrift für anorganische Chemie 105 (1919), S. 112-120 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Topics: Chemistry and Pharmacology
    Notes: 1. Die beste Darstellungsweise des gelben Cuprooxydes ist jene durch Reduktion von Cu″-Ion bei Gegenwart von OH′-Ion mittels salzsaurem Hydroxylamin und die elektrolytische Methode, welche zuerst von LORENZ angegeben wurde, mittels Reinkupferanode und Alkalisulfat als Elektrolyt.
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    Zeitschrift für anorganische Chemie 106 (1919) 
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    Zeitschrift für anorganische Chemie 106 (1919), S. 15-45 
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    Keywords: Chemistry ; Inorganic Chemistry
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    Zeitschrift für anorganische Chemie 106 (1919), S. 95-125 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Der thermische Zerfall des Phosphins PH3 in H2 und P4 wurde zwischen T = 845 und T = 956 in großen Porzellankugeln manometrische zeitlich verfolgt. Oberhalb dieser Temperatur verlief er unmeßbar schnell.
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    Keywords: Chemistry ; Inorganic Chemistry
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