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Previous Interpretations (previous + interpretation)
Selected AbstractsMicrostructural features of albite porphyroblasts as indicators of sequential Barrovian metamorphic mineral growth in the Caledonides of the SW Scottish HighlandsJOURNAL OF METAMORPHIC GEOLOGY, Issue 7 2004V. Mathavan Abstract Inclusion , porphyroblast and porphyroblast , porphyroblast relationships show that abundant albite in mica schists in the Caledonides of the SW Scottish Highlands are part of the Barrovian metamorphic assemblage. Growth early in the D2 deformational phase of porphyroblast cores followed the growth of Mn-rich garnet but preceded the growth of porphyroblasts of the index mineral almandine. Two sets of inclusion trails in the albite correspond to the regionally expressed S1 and S2. Straight trails of muscovite, chlorite, quartz, epidote and the earliest growth of biotite make up S1. Crenulated trails express deformation of S1 early in D2 with muscovite, chlorite, biotite, quartz, epidote and the Mn-rich garnet associated with the development of S2 crenulation cleavage. The geometries of these trails uniquely record early stages of D2 deformational history. An 0,3 growth is related to the temporal coincidence of the formation of S1,S2 crenulation cleavage hinges as favourable sites for nucleation and the release of large amounts of water from prograde reactions during tectonothermal reconstitution of first cycle immature sediments with a volcanic component. The main characteristics of the regionally expressed D2 schistosity were developed during the major grain coarsening that followed both albite and almandine porphyroblast growth. Essentially inclusion-free An 4,19 rims grew on the inclusion-containing cores in the almandine zone in the later stages of schistosity growth and unoriented porphyroblasts of muscovite, biotite and chlorite indicate that mineral growth extended from the later stages of D2 to post-D2. Previous interpretations of the albite porphyroblast growth having been during D4 to post-D4 contemporaneous with retrogression are inconsistent with the microstructural evidence. [source] Matching the frequency spectrum of pre-main sequence stars by means of standard and rotating modelsMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 1 2008M. Di Criscienzo ABSTRACT We applied the aton evolutionary code to the computation of detailed grids of standard (non-rotating) and rotating pre-main sequence (PMS) models and computed their adiabatic oscillation spectra, with the aim of exploring the seismic properties of young stars. As, until now, only a few frequencies have been determined for ,40 PMS stars, the way of approaching the interpretation of the oscillations is not unique. We adopt a method similar to the matching mode method by Guenther and Brown making use, when necessary, also of our rotating evolutionary code to compute the models for PMS stars. The method is described by a preliminary application to the frequency spectrum of two PMS stars (85 and 278) in the young open cluster NGC 6530. For the Star 85, we confirm with self-consistent rotating models, previous interpretation of the data, attributing three close frequencies to the mode n= 4, l= 1 and m= 0, +1 and ,1. For the Star 278, we find a different fit for the frequencies, corresponding to a model within the original error box of the star, and dispute the possibility that this star has a Teff much cooler that the red boundary of the radial instability strip. [source] Chondrocranium and skeletal development of Phrynops hilarii (Pleurodira: Chelidae)ACTA ZOOLOGICA, Issue 4 2009Paula Bona Abstract The present study represents the first comprehensive contribution to the knowledge of the skeletal development of a pleurodiran turtle, Phrynops hilarii (Pleurodira, Chelidae). The most remarkable features found are: (1) absence of ascending process on pterygoquadrate cartilage; (2) presence of ossification centres for the epiotics; (3) as in other pleurodirans, dorsal ribs IX and X are ,sacralized'; (4) contact between ilium and carapace occurs later in ontogenetic development; (5) suture between ischia, pubes and plastron occurs in posthatching specimens; (6) contrary to previous interpretations, the phalangeal formula of the pes of P. hilarii is 2 : 3 : 3 : 3 : 5; (7) the hooked bone represents the fifth metatarsal. [source] THE LAST GLACIATION OF SHETLAND, NORTH ATLANTICGEOGRAFISKA ANNALER SERIES A: PHYSICAL GEOGRAPHY, Issue 1 2008N.R. GOLLEDGE ABSTRACT. Evidence relating to the extent, dynamics, and relative chronology of the last glaciation of the Shetland Islands, North Atlantic, is presented here, in an attempt to better illuminate some of the controversies that still surround the glacial history of the archipelago. We appraise previous interpretations and compare these earlier results with new evidence gleaned from the interpretation of a high resolution digital terrain model and from field reconnaissance. By employing a landsystems approach, we identify and describe three quite different assemblages of landscape features across the main islands of Mainland, Yell and Unst. Using the spatial interrelationship of these landsystems, an assessment of their constituent elements, and comparisons with similar features in other glaciated environments, we propose a simple model for the last glaciation of Shetland. During an early glacial phase, a coalescent British and Scandinavian ice sheet flowed approximately east to west across Shetland. The terrestrial land-forms created by this ice sheet in the north of Shetland suggest that it had corridors of relatively fast-flowing ice that were partially directed by bed topography, and that subsequent deglaciation was interrupted by at least one major stillstand. Evidence in the south of Shetland indicates the growth of a local ice cap of restricted extent that fed numerous radial outlet glaciers during, or after, ice-sheet deglaciation. Whilst the absolute age of these three landsystems remains uncertain, these new geo-morphological and palaeoglaciological insights reconcile many of the ideas of earlier workers, and allow wider speculation regarding the dynamics of the former British ice sheet. [source] Granulite facies thermal aureoles and metastable amphibolite facies assemblages adjacent to the Western Fiordland Orthogneiss in southwest Fiordland, New ZealandJOURNAL OF METAMORPHIC GEOLOGY, Issue 5 2009A. H. ALLIBONE Abstract In southwest New Zealand, a suite of felsic diorite intrusions known as the Western Fiordland Orthogneiss (WFO) were emplaced into the mid to deep crust and partially recrystallized to high- P (12 kbar) granulite facies assemblages. This study focuses on the southern most pluton within the WFO suite (Malaspina Pluton) between Doubtful and Dusky sounds. New mapping shows intrusive contacts between the Malaspina Pluton and adjacent Palaeozoic metasedimentary country rocks with a thermal aureole ,200,1000 m wide adjacent to the Malaspina Pluton in the surrounding rocks. Thermobarometry on assemblages in the aureole indicates that the Malaspina Pluton intruded the adjacent amphibolite facies rocks while they were at depths of 10,14 kbar. Similar P,T conditions are recorded in high- P granulite facies assemblages developed locally throughout the Malaspina Pluton. Palaeozoic rocks more than ,200,1000 m from the Malaspina Pluton retain medium -P mid-amphibolite facies assemblages, despite having been subjected to pressures of 10,14 kbar for > 5 Myr. These observations contradict previous interpretations of the WFO Malaspina Pluton as the lower plate of a metamorphic core complex, everywhere separated from the metasedimentary rocks by a regional-scale extensional shear zone (Doubtful Sound Shear Zone). Slow reaction kinetics, lack of available H2O, lack of widespread penetrative deformation, and cooling of the Malaspina Pluton thermal anomaly within c. 3,4 Myr likely prevented recrystallization of mid amphibolite facies assemblages outside the thermal aureole. If not for the evidence within the thermal aureole, there would be little to suggest that gneissic rocks which underlie several 100 km2 of southwest New Zealand had experienced metamorphic pressures of 10,14 kbar. Similar high- P metamorphic events may therefore be more common than presently recognized. [source] Pacific walrus (Odobenus rosmarus divergens): Differential prey digestion and dietMARINE MAMMAL SCIENCE, Issue 4 2009Gay Sheffield Abstract Stomach content data from 798 Pacific walruses (Odobenus rosmarus divergens) collected during 1952,1991 were analyzed using a method that evaluates the stage of digestion of prey remains. Non-molluscan prey taxa were not well represented in previous interpretations of walrus diet due to digestion biases. Stomach contents least affected by digestion (fresh stomachs) contained more prey taxa than stomachs of an unknown or more digested state. Bivalves, gastropods, and polychaete worms were the most frequent prey items in both the Bering and Chukchi seas, although bivalves occurred more frequently in stomachs from the Bering Sea and gastropods occurred more frequently in stomachs from the Chukchi Sea. Male and female walruses consumed essentially the same prey when in the same location. Using only fresh stomachs collected between 1975 and 1985, there was no significant difference between the proportion that contained mostly bivalves and the proportion that contained non-bivalve prey items. Earlier interpretations of a change in walrus diet in this period compared to the prior two decades may have been due to digestion as well as sampling biases. Current climatic changes may affect walrus's access to diverse, productive shallow water feeding areas. [source] The Death of the Collective Subject in Uwe Johnson's Mutmassungen über JakobORBIS LITERARUM, Issue 6 2003David Kenosian In previous interpretations of Uwe Johnson's Mutmassungen über Jakob, critics have focused primarily on Johnson's relationship to socialism on the complex narrative structure of the novel. In this essay, I explore a topic that has received comparatively little attention: Johnson's notion of subjectivity. I show that Johnson's attempt to challenge Marxist concepts of the collective subject is inseparably linked to his views on representing history. Johnson's first move is to eliminate the omniscient Socialist Realist narrator who is supposed to have a greater understanding of societal forces than do the characters in the fictional world. But in Mutmassungen über Jakob, it is the protagonist (Jakob) who has a greater understanding of politics than the former Socialist Realist narrator (Rohlfs). Their relationship undermines the political hierarchy constituted by workers and party. In addition, history in the novel is not narrated from a privileged epistemological position. Rather, it is reconstructed in a negotiation among various subjects (characters) at the porous border between history and memory. This self-reflexive model of historiography is, as implied by Uwe Johnson, democratic, in contradistinction to Socialist Realism. Finally, I point out that this model of writing history in Mutmassungen über Jakob anticipates the polyphonic representation of the past in Johnson's Jahrestage (1970,83). In Johnson's final work, German history is consequently written in dialogues with Germans, immigrants from Eastern Europe, Holocaust survivors, and textual sources from various countries. [source] SCHLEIERMACHERIAN TRANSCENDENTAL SPIRITUALITY AND THE BOOK OF JOBTHE HEYTHROP JOURNAL, Issue 5 2009DAVID J. TURNBLOOM The Book of Job is certainly one of the most enigmatic and attractive books in all of the Hebrew Scriptures. As a masterfully written poem, Job utilizes imagery and metaphor in such a way as to leave even the secular reader in awe. It tells the story of a pious man who, through many sufferings, is tested by the Divine and sent on a spiritual journey which culminates in a face to face meeting with God. As a poem and as Scripture, Job has been the subject many interpretations over thousands of years. Often read as an insight into the mysteries of evil, innocent suffering, human nature, and the Divine, this piece of poetic Scripture has been the source of much debate and frustration among scholars and the faithful alike. It is not the purpose of this essay to attempt an overview of these various interpretations with the intention of settling upon one superior interpretation. Also, it is not the purpose of this essay to refute any previous interpretations. What I will offer is merely one interpretation among many , an interpretation which I hope might further, if only to the smallest degree, the significance of this great text for even one reader. This essay will take the theology of Friedrich Schleiermacher and, relying on an interpretation of Job given by Gustavo Gutierrez, offer a way of reading Job which leads to a transcendental spirituality. I will accomplish this in three parts: first, I will lay out certain Schleiermacherian concepts which advocate a form of transcendental spirituality; next, relying on Gutierrez's interpretation, I will draw parallels between Schleiermacher's concepts and the spiritual journey of Job; finally, I will show how the book of Job itself can be read as a tool for developing a transcendental spirituality within the reader. In the end, it will be clear that, without fear of ,misinterpretation,' the Book of Job can guide the reader to a transcendental spirituality. [source] Protein flexibility: coordinate uncertainties and interpretation of structural differencesACTA CRYSTALLOGRAPHICA SECTION D, Issue 11 2009Alexander A. Rashin Valid interpretations of conformational movements in protein structures determined by X-ray crystallography require that the movement magnitudes exceed their uncertainty threshold. Here, it is shown that such thresholds can be obtained from the distance difference matrices (DDMs) of 1014 pairs of independently determined structures of bovine ribonuclease A and sperm whale myoglobin, with no explanations provided for reportedly minor coordinate differences. The smallest magnitudes of reportedly functional motions are just above these thresholds. Uncertainty thresholds can provide objective criteria that distinguish between true conformational changes and apparent `noise', showing that some previous interpretations of protein coordinate changes attributed to external conditions or mutations may be doubtful or erroneous. The use of uncertainty thresholds, DDMs, the newly introduced CDDMs (contact distance difference matrices) and a novel simple rotation algorithm allows a more meaningful classification and description of protein motions, distinguishing between various rigid-fragment motions and nonrigid conformational deformations. It is also shown that half of 75 pairs of identical molecules, each from the same asymmetric crystallographic cell, exhibit coordinate differences that range from just outside the coordinate uncertainty threshold to the full magnitude of large functional movements. Thus, crystallization might often induce protein conformational changes that are comparable to those related to or induced by the protein function. [source] | |||||||||||||