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Search Results: 1 - 10 of 324575 matches for " E.G. "
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The International Mycological Association: its history in brief with summaries of its International Mycological Congresses and diverse international relationships
E.G. Simmons
IMA Fungus , 2010,
Abstract: This history presents a review of International Mycological Association activities, its international congresses, and its relationships with regional mycological associations as well as with international organizations of other scientific disciplines. The IMA was organized in 1971 during the First Mycological Congress (IMC-1) convened at Exeter, U.K. In the period 1971 to 2010, nine international congresses have been held, each with its own organizational structure but under the guidance of one of the successive inter-Congress management groups of IMA officers and executive committee members. The congress list includes Exeter, U.K.; Tampa, U.S.A.; Tokyo, Japan; Regensburg, Germany; Vancouver, Canada; Jerusalem, Israel; Oslo, Norway; Cairns, Australia; and Edinburgh, Scotland. Inter-congress activities of each IMA executive group are summarized. The characteristics of each congress are surveyed as to organization, programming, attendance numbers, finances, and satellite meetings.The IMA has sponsored the establishment of Regional Mycological Associations beginning in 1977 and has lent operational funding. Regional associations currently are functional and hold their own regional congresses in Africa, Asia, Australasia, Europe, and Latin America. The relationships of the IMA with other organizations recognized within the supra-national International Council of Scientific Unions are discussed.
Petroleum and Gas Reserves Exploration by Real-Time Expert Seismology and Non-Linear Seismic Wave Motion
E.G. Ladopoulos
Advances in Petroleum Exploration and Development , 2012, DOI: 10.3968/j.aped.1925543820120401.295
Abstract: By using a non-linear 3-D elastic waves real-time expert system, the new theory of “Non-linear Real-Time Expert Seismology” is investigated, for the exploration of the on-shore and off-shore petroleum and gas reserves all over the world. Such a highly innovative and groundbreaking technology is working under Real Time Logic for searching the on-shore and off-shore hydrocarbon reserves developed on the continental crust and in deeper water ranging from 300 to 3000 m, or even deeper. Consequently, this real-time expert system, will be the best device for the exploration of the continental margin areas (shelf, slope and rise) and the very deep waters, as well. The proposed modern technology can be used at any depth of seas and oceans all over the world and for any depth in the subsurface of existing oil reserves. Beyond the above, the various mechanical properties of rock regulating the wave propagation phenomenon appear as spatially varying coefficients in a system of time-dependent hyperbolic partial differential equations. The propagation of the seismic waves through the earth subsurface is described by the wave equation, which is then reduced to a Helmholz differential equation. Furthermore, the Helmholtz differential equation is numerically evaluated by using the Singular Integral Operators Method (S.I.O.M.). Several properties are further analyzed and investigated for the wave equation. Finally, an application is proposed for the determination of the seismic field radiated from a pulsating sphere into an infinite homogeneous medium. Thus, by using the S.I.O.M., then the acoustic pressure radiated from the above pulsating sphere is determined. Key words: Non-linear real-time expert seismology; Singular integral operators method (S.I.O.M.); Time-dependent hyperbolic partial differential equations; Oil and gas reserves; Petroleum reservoir engineering; Helmholtz differential equation; Real-time expert system; Wave equation
Eritema-papulosis form rosacea – results of immunohistochemical research of the condition of the lesions
Haritonova E.G.
Морфолог?я , 2011,
Abstract: Studying and the analysis of links pathogenesis of eritema-papulosis forms of rosacea by means of a wide spec-trum of immunohistochemical markers became a research problem. Fo r the decision of tasks in view by the author it is used a material of 12 diagnosed cases eritema-papulosis forms of rosacea at men at the age from 32 till 64 years. Use of immunohis-tochemical methods of research has allowed to reveal new links in pathogenesis rosacea and to establish a role of some cellu-lar populations of a skin and cages of imm une system in disease progressing. Besides, at use of the offered scheme of treat-ment dynamics of immunohistochemical indicators was observed considerably more expressed at erit ema-papulosis forms. Treatment influence on an immune link was has been confirmed essential, concerning control, reduction of quantity CD4 + cages, and also changes in quantity CD1 а +, CD138 + that CD68 + cages. Essential re sult the offered scheme gives in a di-rection of suppression of fibrous changes in derma and myofib roblastic transformations dendroc ytes. Considerably the meta-bolism extracellular of matrix improves. Influence of treatment on a vascular component proves to be true reduction of densi-ty of vessels in parallel with decrease in expression VEGF.
Structural changes in the mucous membranes of the upper gastrointestinal tract in experimental gastroduodenitis
Romanenko E.G.
Морфолог?я , 2013,
Abstract: The results of long-term intragastric administration of the bile to laboratory rats are examined. The experiment was reproduced on immature rats of both sexes of Wistar (28 animals of experimental group, 12 – control). Morphologic study founds non-uniform thickness of gingival epithelium, the presence of phenomena dyskeratosis, incomplete keratinization. Degenerative changes in the granular layer, the basal layer of the epithelium in places represented by two rows of cells, which constitutes a violation of trophic epithelium and cell division are marked. In the lamina propria gum thickened collagen fibers and sealed, there are phenomena fibrosis and obstruction of blood capillaries. Microscopic examination of the gastric mucosa observed shallow defects of the epithelium, glands gaps widened, glandular cells increased. In the stroma defines the fibrosis and dense lymphocytic infiltration with a mixture of eosinophils. In the duodenum in the proximal mucosa glandular epithelial desquamation, superficial erosion of the proximal villi, covered a lot of mucus are marked. In the submucosal layer there are sharply fully fledged vessels. In the mucosa there are stasis in the capillaries, which constitutes a violation of the microcirculatory level of the vascular system. The findings suggest that the role of functional disorders of the digestive tract in the pathogenesis of gastroduodenal comorbidity and periodontal tissues.
Mediated Electron Transfer at Redox Active Monolayers Part 2 : Analysis of the Chronoamperometric Response to a Potential Step Perturbation
Michael E.G. Lyons
Sensors , 2002, DOI: 10.3390/s20800314
Abstract: A theoretical model describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers is presented. We describe theoretically the time dependent chronoamperometric response expected for a redox active monolayer in the absence of a substrate in solution, and subsequently extend the analysis to consider the reaction of a solution phase substrate mediated by surface immobilized redox groups. This is accomplished via a Laplace transform based solution of the Fick diffusion equation for the substrate transport to the monolayer surface coupled with the development of a suitable flux matching condition at the monolayer/solution interface . The latter procedure enables the development of an analytical expression for the transient current response in terms of well established mathematical special functions. We have shown that kinetic information may be readily extracted from the developed expressions for the current response as a function of time. In the present paper we assume that the reaction between mediator and substrate is of a simple outer sphere bimolecular type.
Modelling the Transport and Kinetics of Electroenzymes at the Electrode/Solution Interface
Michael E.G. Lyons
Sensors , 2006, DOI: 10.3390/s6121765
Abstract: The solution phase transport and direct electrode kinetics of electro-enzymes are described in terms of a simple model in which the steady state reaction/diffusion equation for enzyme is solved subject to physically realistic boundary conditions. Two physically realizable situations are described: the semi infinite and the membrane bounded case. Limiting expressions for the reaction flux are derived and the kinetic possibilities discussed geometrically in terms of kinetic case diagrams.
Mediated Electron Transfer at Redox Active Monolayers. Part 4: Kinetics of Redox Enzymes Coupled With Electron Mediators
Michael E.G. Lyons
Sensors , 2003, DOI: 10.3390/s30200019
Abstract: A detailed kinetic analysis of the pertinent physical processes underlying the operation of enzyme electrodes immobilized within alkane thiol self assembled monolayers is developed. These electrodes utilize a soluble mediator, which partitions into the monolayer, regenerates the active catalytic form of the enzyme and is re-oxidized at the underlying support electrode surface giving rise to a current which reflects kinetic events at the enzyme surface. Both the enzyme/substrate and enzyme mediator kinetics have been quantified fully in terms of a ping-pong mechanism for the former and Michaelis-Menten kinetics for the latter. The effect of substrate and mediator diffusion in solution have also been specifically considered and the latter processes have been shown to result in a complex expression for the reaction flux. Four limiting kinetic cases have been enumerated and simple expressions for the reaction flux in each of these rate limiting situations have been developed. Kinetic case diagrams have been presented as an aid to mechanistic diagnosis. The complicating effects of diffusive loss of reduced mediator from the enzyme layer have also been examined and the relation between the observed flux corresponding to reduced mediator oxidation at the support electrode and the substrate reaction flux in the enzyme layer have been quantified in terms of an efficiency factor. Results extracted from recently published practical realizations of immobilized monolayer enzyme systems have been discussed in the context of the proposed model analysis.
Mediated Electron Transfer at Redox Active Monolayers
Michael E.G. Lyons
Sensors , 2001, DOI: 10.3390/s10700215
Abstract: A theoretical model describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers is presented. Although the analysis presented has quite general applicability, a specific focus of the paper is concerned with the idea that redox active monolayers can be used to model an ensemble of individual molecular nanoelectrodes. Three possible rate determining steps are considered: heterogeneous electron transfer between immobilized mediator and support electrode ; bimolecular chemical reaction between redox mediator and reactant species in the solution phase, and diffusional mass transport of reactant in solution. A general expression for the steady state reaction flux is derived which is valid for any degree of reversibility of both the heterogeneous electron transfer reaction involving immobilized mediator species and of the bimolecular cross exchange reaction between immobilized mediator and solution phase reactant. The influence of reactant transport in solution is also specifically considered. Simplified analytical expressions for the net reaction flux are derived for experimentally reasonable situations and a kinetic case diagram is constructed outlining the relationships between the various approximate solutions. The theory enables simple diagnostic plots to be constructed which can be used to analyse experimental data.
Mediated Electron Transfer at Redox Active Monolayers. Part 3: Bimolecular Outer-Sphere, First Order Koutecky-Levich and Adduct Formation Mechanisms
Michael E.G. Lyons
Sensors , 2002, DOI: 10.3390/s21200473
Abstract: A number of theoretical models describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers (such as self assembled alkane thiols containing a ferrocene group) is presented. These models are : simple bimolecular outer-sphere, generalized Koutecky-Levich, and substrate binding/ adduct formation . For each model a general expression for the steady state reaction flux is derived. Simplified analytical expressions for the net reaction flux under steady state conditions, are derived for experimentally reasonable situations, and kinetic case diagrams are constructed outlining the relationships between the various approximate solutions. The theory developed enables simple diagnostic plots to be constructed which can be used to analyse experimental data.
Die Afrikaanse volkskultuur en die toekoms: Gesien uit die oogpunt van die kunstenaar
W. E.G. Louw
Koers : Bulletin for Christian Scholarship , 1970, DOI: 10.4102/koers.v37i3&4.1330
Abstract: Ek glo nie ek vergis my as ek meen dat daar enkele vrae opgesluit lê in die tema vir hierdie reeks soos dit aan my voorgelê is nie. Die opgaaf lui immers soos volg: Die Afrikaanse Volkskultuur en die Toekoms, gesien uit die oogpunt van die kunstenaar.
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