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    Mineralien und Fossilien

    Roberts, John L
    Gütersloh : Bassermann
    2000
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    Titre: Mineralien und Fossilien / John L. Roberts
    Auteur: Roberts, John L
    Editeur: Gütersloh : Bassermann
    Date: 2000
    Collation: 128 S. : Ill. ; 20 cm
    Identifiant: 9783809407515 (ISBN)
    No RERO: R004586582
    Permalien:
    http://data.rero.ch/01-R004586582/html

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    Cross-folds

    Roberts, John L
    Geological Magazine, 1959, Vol.96(5), pp.418-418 [Revue évaluée par les pairs]
    Cambridge University Press
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    Titre: Cross-folds
    Auteur: Roberts, John L
    Echelle: 1959
    Sujet: Geology;
    Précédemment: 195910
    Fait partie de: Geological Magazine, 1959, Vol.96(5), pp.418-418
    Classement: 195910
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S0016756800062397 (DOI)

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    What residents know about health care reform and what we should teach them

    Roberts, John L, Ostapchuk, Michael, Miller, Karen Hughes, Ziegler, Craig H
    Journal of graduate medical education, June 2011, Vol.3(2), pp.155-61 [Revue évaluée par les pairs]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Titre: What residents know about health care reform and what we should teach them
    Auteur: Roberts, John L; Ostapchuk, Michael; Miller, Karen Hughes; Ziegler, Craig H
    Sujet: Medicine;
    Description: We surveyed residents and fellows at the University of Louisville School of Medicine (N  =  600) to (1) explore their perceptions and knowledge of issues related to health care business and health care reforms, and (2) seek their input on what instructional content concerning health care business and health care reform they would like to receive and what instruction venue they would prefer. We will use the findings to make decisions about curriculum content and delivery. All residents were invited to complete a 4-part, web-based survey that included questions on demographics, attitudes, and perceptions; a baseline-knowledge quiz about health care costs; and 2 open-ended questions about what they wanted to learn and how they preferred to be taught. The survey response rate was 24%. Residents' agreement was stronger for statements relating to the role of physicians as "gatekeepers," patient-centered care, and the value of learning to work as a team than it was for statements about the benefits of government intervention in health care. International medical graduates, when compared with US medical graduates, had statistically significant differences in perceptions (P ≤ .004) on 3 questions related to government impact on health care. There was a slight decrease in overall knowledge about health care cost issues by residents in later postgraduate years. Residents are aware of gaps in their knowledge on business aspects of health care and health care reform. Their narrative responses identified coding and billing, legal issues, and comparative health systems as topics of interest, and the best venues for teaching included grand rounds and noon conferences. Residents indicated a preference for brief, highly focused, interactive sessions with knowledgeable guest speakers.
    Fait partie de: Journal of graduate medical education, June 2011, Vol.3(2), pp.155-61
    Identifiant: 1949-8357 (E-ISSN); 22655136 Version (PMID); 10.4300/JGME-D-10-00122.1 (DOI)

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    Some features of the Mesozoic vulcanicity in the Lebanon

    Roberts, John L
    Geological Magazine, 1971, Vol.108(2), pp.115-118 [Revue évaluée par les pairs]
    Cambridge University Press
    Disponible
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    Titre: Some features of the Mesozoic vulcanicity in the Lebanon
    Auteur: Roberts, John L
    Echelle: 1971
    Sujet: Articles ; Geology;
    Description: Summary Dykes of limestone breccia, brecciated masses of limestone within vents, and intrusive relations between basalt and limestone are described as features of interest within a short distance of Beirut.
    Précédemment: 197105
    Fait partie de: Geological Magazine, 1971, Vol.108(2), pp.115-118
    Classement: 197105
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S001675680005113X (DOI)

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    The Emplacement of the Main Glencoe Fault-Intrusion at Stob Mhic Mhartuin

    Roberts, John L
    Geological Magazine, 1966, Vol.103(4), pp.299-316 [Revue évaluée par les pairs]
    Cambridge University Press
    Disponible
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    Titre: The Emplacement of the Main Glencoe Fault-Intrusion at Stob Mhic Mhartuin
    Auteur: Roberts, John L
    Echelle: 1966
    Sujet: Igneous And Metamorphic Petrology ; Europe ; Genesis ; Great Britain ; Igneous Rocks ; Intrusions ; Mechanism ; Petrology ; Scotland ; Stob Mhic Mhartuin ; United Kingdom ; Western Europe;
    Description: Abstract The contact relationships of the Fault-Intrusion are described, in detail, from the type locality. Textural and mineralogical evidence indicates that the fine-grained marginal facies of the Fault-Intrusion is not a priori evidence for magmatic emplacement. The production of “ flinty crush-rock ” from brecciated quartzites downfaulted within the Glencoe cauldron is described from the south-western inner contact, and is shown to be a result of gas attrition. “ Flinty crush-rock ” is recorded for the first time from the north-eastern contact with the country rocks outwith the cauldron, separated from the latter by a sheared microbreccia not found at the inner contact. The contact relations of the Fault-Intrusion with these “ flinty crush-rocks ”, more properly termed pseudotachylites, indicates that the Fault-Intrusion was emplaced as an entrained fluidized system of gas, solid phenocrysts and, probably, liquid droplets. The production of the sheared microbreccia at the outer contact is thought to be due to shearing stresses exerted by the entrained system on the heated wall-rocks.
    Précédemment: 196608
    Fait partie de: Geological Magazine, 1966, Vol.103(4), pp.299-316
    Classement: 196608
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S0016756800052973 (DOI)

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    Fold Structures in the Dalradian Rocks of Knapdale, Argyllshire

    Roberts, John L
    Geological Magazine, 1959, Vol.96(3), pp.221-229 [Revue évaluée par les pairs]
    Cambridge University Press
    Disponible
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    Titre: Fold Structures in the Dalradian Rocks of Knapdale, Argyllshire
    Auteur: Roberts, John L
    Echelle: 1959
    Sujet: Articles ; Geology;
    Description: Abstract In the Dalradian rocks of Knapdale in south-west Argyll two groups of minor folds have been developed which share the same axial plane; their fold axes lie at right angles to each other within the common axial plane. Field evidence indicates that the two fold groups are strictly contemporaneous. One group of minor folds plunges at 40° to 020° N., and the other group plunges at 45° to 235° N., the common axial plane dipping at 70° to 305° N. Major structures parallel to both sets of minor folds are developed in the area. The fabric diagram of the fold groups shows tetragonal symmetry and this is taken to indicate that the stress field responsible for the deformation had itself tetragonal symmetry. The maximum compressive stress acted almost horizontally in a N.W.–S.E. direction while extension took place equally in all directions in a plane normal to the axis of maximum compression. The relations of contemporaneous fold structures to three basic strain patterns are briefly discussed.
    Précédemment: 195906
    Fait partie de: Geological Magazine, 1959, Vol.96(3), pp.221-229
    Classement: 195906
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S0016756800060209 (DOI)

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    Tetramethylcyclopentadienylselenium derivatives

    Ford, Susan, Hofmann, Marco, Morley, Christopher P, Roberts, John L, Di Vaira, Massimo
    Organic & biomolecular chemistry, 07 November 2005, Vol.3(21), pp.3990-5 [Revue évaluée par les pairs]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Titre: Tetramethylcyclopentadienylselenium derivatives
    Auteur: Ford, Susan; Hofmann, Marco; Morley, Christopher P; Roberts, John L; Di Vaira, Massimo
    Description: Bis(1,2,3,4-tetramethylcyclopentadienyl)selane (1) has been prepared by the reaction of tetramethylcyclopentadienyllithium (Cp(t)Li) with selenium bis(diethyldithiocarbamate). Treatment of Cp(t)Li with elemental selenium, followed by air oxidation, led to loss of the allylic hydrogen atom, and formation of the novel tricyclic compound 1,4,5,6,7,10,11,12-octamethyltricyclo[7.3.0.0]-2,8-diselenadodeca-3,5,9,11-tetraene (2). The sulfur analogue of 2 has been obtained by a similar procedure. The X-ray crystal structures of compounds 1 and 2 have been determined, and the molecular geometry observed for has been probed using DFT calculations.
    Fait partie de: Organic & biomolecular chemistry, 07 November 2005, Vol.3(21), pp.3990-5
    Identifiant: 1477-0520 (ISSN); 16240019 Version (PMID)

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    A Re-Interpretation of the Ben Lui Fold

    Roberts, John L, Treagus, J. E
    Geological Magazine, 1964, Vol.101(6), pp.512-516 [Revue évaluée par les pairs]
    Cambridge University Press
    Disponible
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    Titre: A Re-Interpretation of the Ben Lui Fold
    Auteur: Roberts, John L; Treagus, J. E
    Echelle: 1964
    Sujet: Articles ; Geology;
    Description: Abstract A re-interpretation of the Ben Lui Fold (and its equivalents) is suggested on the basis of correlating the structures in the South-West Highlands (Roberts, 1963) with those in Upper Glen Lyon (Treagus, in preparation) and the Tummel (Sturt, 1961) and Blair Atholl (Harris, 1963) districts. In all these districts the Cowal-Loch Tay flat belt and the steep belt to its north-west define a structure previously interpreted as the hinge of the primary and recumbent Ben Lui Syncline. As primary structures are themselves folded round this hinge, and as minor secondary structures are congruent with it, the authors interpret the Ben Lui Fold as a secondary structure.
    Précédemment: 19641230
    Fait partie de: Geological Magazine, 1964, Vol.101(6), pp.512-516
    Classement: 19641230
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S0016756800050068 (DOI)

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    The intrusive form of some basalt dykes showing flow lineation

    Roberts, John L, Sanderson, David J
    Geological Magazine, 1971, Vol.108(6), pp.489-499 [Revue évaluée par les pairs]
    Cambridge University Press
    Disponible
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    Titre: The intrusive form of some basalt dykes showing flow lineation
    Auteur: Roberts, John L; Sanderson, David J
    Echelle: 1971
    Sujet: Articles ; Geology;
    Description: Summary The dilational intrusion is described of some basalt dykes of Tertiary age into the Easdale Slates at Easdale, Argyllshire. The intrusive form of the dykes results from the walls of irregular fractures, guided by pre-existing planes of weakness, moving apart under magma pressure. The propagation of the fractures is discussed in relation to the external stress field controlling the intrusion of the dykes and the direction of opening of the fractures considered in relation to the magma pressure and the external stress field. The flow lineations developed at the margins of the dykes are discussed in terms of their mode of origin. Although the attitude of these lineations varies with the intrusive form of the dykes, the overall direction of flow of the magma was upwards to the north of northwest.
    Précédemment: 197111
    Fait partie de: Geological Magazine, 1971, Vol.108(6), pp.489-499
    Classement: 197111
    Identifiant: 0016-7568 (ISSN); 1469-5081 (E-ISSN); 10.1017/S0016756800056697 (DOI)

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    Systemic versus cellular acclimation to temperature by poikilotherms

    Roberts, John
    Helgoländer wissenschaftliche Meeresuntersuchungen, 1966, Vol.14(1), pp.451-465 [Revue évaluée par les pairs]
    Springer Science & Business Media B.V.
    Disponible
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    Titre: Systemic versus cellular acclimation to temperature by poikilotherms
    Auteur: Roberts, John
    Sujet: Life Sciences ; Oceanography ; Ecology ; Microbiology ; Plant Sciences ; Zoology ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution ; Biology ; Oceanography ; Zoology ; Ecology;
    Description: Die Bildung nervöser, hormonaler und zirkulatorischer Systeme hat im Verlauf der Evolution durch die Entwicklung homöostatischer Feed-back-Systeme zu thermischer Unabhängigkeit vom Klima (Poikilothermie) geführt. Es lassen sich zwei Arten der Temperaturkompensation unterscheiden, die von Precht Leistungs- und Resistenzadaptation (Thermostabilität nach Ushakov ) genannt werden. Bei Betrachtung des intraspezifischen Niveaus dieser Adaptationen ergeben sich mehrere ungelöste Fragen. Diese werden anhand von Vorstellungen, denen eigene Arbeiten an eurythermen Süßwasserfischen (Lepomis gibbosus, Carassius carassius) zugrunde liegen, erörtert: (1) Die genetische Basis der Leistungs- und Resistenzadaptation beruht teilweise auf unterschiedlichen Selektionsvorgängen. (2) Den Akklimationsunterschieden, die hinsichtlich der Letaltemperaturen isolierter Gewebe und Organe gefunden werden, kann oft keine ökologische Bedeutung zugeordnet werden im Gegensatz zu den entsprechenden Verhältnissen im Ganztier. Der letztgenannte Gesichtspunkt basiert auch auf Ushakovs Studien sowie den Experimenten von Baslow & Nigrelli , nach denen die Temperaturgrenzen der Cholinesterase-Aktivität des Gehirns von Fundulus teilweise homöostatische Regulationen der Leistungsadaptation widerspiegeln. Meines Erachtens erfordert eine Beantwortung dieser Fragen die Erfassung des relativen Ausmaßes systemischer Wechselwirkungen bei verschiedenen größeren Tiergruppen und eine Untersuchung der Adaptationseigenschaften verschiedener Zelltypen lebender Tiere, in welchen die zellulären Aktivitäten systemischen Wechselwirkungen unterworfen sind. 1. This discussion is based upon the assumption that the invention of multicellularity and the subsequent elaboration of nervous, hormonal and circulatory systems has led to an increasing degree of thermal independence from climate for poikilotherms by the evolution of homeostatic feedback systems. 2. Systemic dominance in homeostasis has been considered in relation to metabolic compensations in the respiration of the sunfish, Lepomis gibbosus , the crucian carp, Carassius carassius , and selected tissues (brain, gill, muscle) following adaptation to various temperatures and photoperiods. Uncoupled respiration has also been examined in sunfish brain and gill tissues following treatment with 2, 4-dinitrophenol. A poor type 3 trend (statistically unsupported) was found to be upset by uncoupling and was followed by a probable type 5 response. 3. Comparisons were made (at 20° C) between day and night respiration rates of crucian carp acclimated to 5°, 12° and 20° C. These suggest that the inverse compensation of the fish (type 5) is a behavioral adaptation to special winter conditions, perhaps hibernation. 4. Some of the problems concerned with deriving ecological meaning from experiments on resistance and capacity adaptations in isolated cells and tissues have been discussed. The suggestion is made that means be developed to expand studies in which adaptation characteristics of cell types can be examined within living animals.
    Fait partie de: Helgoländer wissenschaftliche Meeresuntersuchungen, 1966, Vol.14(1), pp.451-465
    Identifiant: 0017-9957 (ISSN); 1438-3888 (E-ISSN); 10.1007/BF01611638 (DOI)