Academic literature on the topic 'Virgilio P'

<p>La magia acompaña el desarrollo de la vida humana sobre la tierra. Tan mágico le pareció al hombre de las cavernas ver cómo brotaba el fuego por la frotación de dos maderas o por el choque de dos piedras, como el "hacer llover" por la imitación del ruido de la lluvia. En estas dos operaciones el impulsor es el deseo: deseo de obtener fuego para cocer los alimentos o para combatir el frió; deseo de atraer la lluvia sobre la tierra.</p>

<p>El 10 de marzo de 1838 se publica en las páginas de <em>La Moda.</em> <em>Gacetín semanal de Música, de Poesía, de Literatura, de Costumbres</em> un artículo titulado “La conversación”, atribuido a Juan María Gutiérrez. Para ejemplificar las bondades y rasgos de la conversación, el crítico argentino recurre a algunas imágenes, comparaciones, referencias literarias y citas, entre las que se destaca una perteneciente a Virgilio. Sin especificar la fuente concreta, Gutiérrez transcribe un breve pasaje en español, en prosa, que constituye a nuestro entender un testimonio valioso de la recepción de Virgilio en la literatura argentina. El presente trabajo se propone analizar dicha cita y las operaciones que implementa Gutiérrez para ponerla en diálogo con el nuevo contexto.</p>

<p>La nutrida obra de Carlos Montemayor ha sido objeto de análisis, reflexiones y discusiones en los diferentes entornos y ámbitos en los que el autor participó. Su trabajo en las humanidades y artes ha sido reconocido por la diversidad de temas tratados en sus distintas obras, las cuales cuentan con amplias y concretas referencias a la época de los clásicos griegos. La trayectoria de Carlos Montemayor le permite ser una referencia importante para escritores e investigadores. En este ensayo, analizo particularmente la figura metafórica de Virgilio a través de la traducción que hace el mismo Montemayor de la Égloga IV, así como de los poemas contenidos en su obra póstuma "Apuntes del exilio", donde nuestro autor construye, a partir de las características que reconoce en los escritores clásicos y en el mismo Virgilio, un poemario de profundidad y sagacidad para el lector más dotado y también para el menos experimentado.</p>

<p style="text-align: justify;">El pensamiento educativo de José Mendo, fundamentándose en la filosofía y la filosofía de la educación, contribuye a comprender que la educación es una actividad consciente humana e histórica, que está orientada por los aspectos políticos, económicos y sociales. No es ni puede ser una actividad neutra, abstracta y aséptica; a la vez, contiene dimensiones ontológicas, axiológicas, lógicas y epistemológicas. </p>

<p>El trabajo se propone un análisis del personaje de Lavinia basado en la novela homónima de Ursula K. Le Guin. Nuestro recorrido considera el pasaje de la periferia al centro de la escritura. El discurso de Lavinia reflexiona acerca del rol del héroe, acerca del poeta y del poder de los textos. Finalmente, este vínculo entre <em>Eneida </em>de Virgilio, que nos recuerda que el poder asociado con la acción y la palabra pertenece a los hombres, y Le Guin cuya narrativa se focaliza en la experiencia y la voz femenina de la protagonista.</p>

<p>Sr. Rector José Narro Robles. Sra. Directora María Leoba Castañeda Rivas. Maestros y alumnos de Facultad. Señoras y señores.<br />Era Director el licenciado Virgilio Domínguez. Éramos 350 alumnos egresados, la mayoría, de la Escuela Nacional Preparatoria. Cruzamos la calle, después de dos años en el bachillerato de humanidades, y entramos a esta Escuela de Jurisprudencia. Nunca una calle tan corta y tan angosta había encerrado tantas ilusiones, angustias, desconfianza en el futuro, alegría de vivir, todo junto, tan contradictorio, tan absoluto y diverso, en la breve cuadra de Carmen a República de Argentina rebotaban como la corriente de un río incontrolable nuestros sentimientos, recuerdos compartidos o amores indecisos. Juramentos y olvido, la deuda perdonada, el olor del pan de chinos, de los libros viejos y del comal y la tortilla.</p>

Este trabajo tiene como objetivo conocer los avances y dificultades presentadas en el quehacer cotidiano de las investigaciones educativas, con el fin de promover nuevas miradas en un contexto social complejo, conflictivo y cambiante.Para tal fin se parte de comprender la educación es imposible pensarla sin su vínculo con la sociedad, determinada por un contexto político y económico. Se considera que, si bien la educación tiene cierta autonomía, es fundamental encarar sus análisis en el marco de procesos sociales, económicos y políticos nacionales y globales (WAINERMAN y DI VIRGILIO, 2011, p. 58). Desde la segunda visión la inclusión se resuelve con intervenciones en la escuela centradas solamente en el contenido, la didáctica y la formación del docente.

<p><strong>Abstract.</strong> The paper presents the case study of the complete 3D survey of the area of the Fort of Pietole in Borgo Virgilio using the Leica Pegasus Backpack wearable Mobile Mapping System (MMS). Surveying the site is challenging because of its complex topology on the one hand (with notably narrow passages) and because of the presence of vegetation on the other. The framework within which this research takes place is the Fort of Pietole survey project that aims at the extraction of the Digital Terrain Model (DTM) of the area and the georeferencing of the fort defensive structures. The requirement of the project is the 3D reconstruction of the whole area at an accuracy that stands between a big scale environmental survey and a small-scale architectonic survey (1&amp;thinsp;:&amp;thinsp;500).</p> <p>The project is the opportunity to discuss the state of the art of wearable MMS, and to test the versatility and accuracy outcomes of the Pegasus Backpack under varying and challenging condition (indoor-outdoor, even-uneven pavement, satellite covered-denied areas) with the ambitious goal to use only the backpack MMS to record all the data from the DTM to the indoor narrow structures.</p>

Objetivos: Comparar la edad cronológica y edad dental según el método de Demirjian en pacientes de 5 a 16 años que acudieron al Centro Radiológico Dr. Virgilio Aguirre Cadena, Guayaquil-Ecuador durante el período2014-2015. Material y Métodos: Se evaluaron 617 radiografías panorámicas tomadas durante el año 2014-2015, posteriormente se procedió a realizar el cálculo de la edad dental utilizando el método de Demirjian de cada uno de los pacientes. Luego se realizó un análisis comparativo con la edad cronológica tomada de la misma base de datos de las imágenes, para lo cual se utilizó la prueba de Wilcoxon. Resultados: La estimación de la edad dental en relación con la edad cronológica, se observó en el sexo femenino dentro del grupo etario de 7-7,99 y el de 10-10,99, presentó buenos estimadores para determinar la edad cronológica, mostrando valores de p=0,6643 y p=0,1147 respectivamente; en el sexo masculino, el grupo etario de 10-10,99 y 12-12,99 mostró buenos esti- madores para determinar la edad cronológica con valores de p=0,2713 y p=0,6996 respectivamente. El resto de grupos no presentó buenos estimadores para determinar la edad cronológica con valores de p˂0,05. Conclusio- nes: El método de Demirjian no es un buen estimador de la edad ósea en todos los grupos etarios de la población estudiada, puesto que, la mayoría de grupos presentan diferencias entre la edad dental y la edad cronológica.

Thesis (MSc)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: The aim of this study was to determine how P nutrition affects biological nitrogen fixation (BNF) via effects on the N2-fixing bacteria in the nodules of Virgilia species native to the Cape Floristic Region (CFR), South Africa. This was evaluated in 3 separate studies: The first study aimed to determine how phosphorus deficiency affects N nutrition of two legume tree species from the Mediterranean Fynbos ecosystem. This study showed that during prolonged P deficiency, V. divaricata maintained a constant biomass, while V. oroboides showed a decreased biomass. V. oroboides showed a decrease in nutritional concentrations, which resulted in the decrease of symbiotic nitrogen fixation (SNF). Both plants utilized atmospheric N more efficiently per nodule under P deficiency. Maximum photosynthesis decreased in V. oroboides, while V. divaricata maintained its photosynthesis. Both species also had greater carbon construction costs during P deficiency. V. divaricata showed clear adaptive features during P-deficiency, as it maintained its growth respiration. The two legume species appear to have different adaptations to P deficiency, which may influence their performance and distribution in their naturally low P environment. The second study aimed to evaluate if soil environmental conditions and mineral nutrient concentration play a major role in microbial communities in plant rhizosphere and nodulation during N2 fixation in legumes. Therefore this study firstly aimed to determine the composition of the N2 fixing bacterial population in the rhizosphere and nodules of V. divaricata. Secondly, it aimed to determine the contribution of these bacteria to N2 fixation during conditions of P deficiency in the Fynbos environment. In the study, the effects of phosphate (P) nutrition on N2 fixing bacterial community structures in Virgilia divaricata rhizosphere and nodules were examined in a pot experiment. V. divaricata were germinated in Fynbos soil as natural inoculum, transferred to clean sand cultures and supplied with 500 μM P and 5 μM P. The N2 fixing bacterial communities in the rhizosphere and nodules were examined based on the PCR-DGGE banding patterns of 16S rDNA and sequencing methods. The GenBank blast results revealed that V divaricata was efficiently nodulated by a wide range of root-nodule bacterial strains, including Burkholderia phytofirmans, Burkholderia sp. and Bradyrhizobium sp. during low P supply. The 15N natural abundance data also confirmed that 40-50% of the N nutrition was acquired through symbiotic N2 fixation. This is not only evidence of nodulation, but also an indication of the adaptation of a range of N2 fixing bacterial strains / species to the nutrient poor, sandy, acidic soil of the Mediterranean-type ecosystems of the Fynbos. The third study examined the physiological effects, such as N2 fixation parameters, plant dependence on N2 fixation, N preference, legume plant growth, carbon costs and amino acid biosynthesis during P deficiency and mineral N supply as NH4NO3 in a slow-growing, Fynbos legume tree, Virgilia divaricata. Continued application of NH4NO3 to the legume plant showed a greater increase in plant dry matter compared to plants with two nitrogen sources (mineral N and atmospheric N2) or plants that relied on atmospheric N2 fixation. Carbon construction costs were more pronounced in plants supplied with two N sources and during P deficiency. Maximum photosynthetic rates per leaf area increased during prolonged P deficiency, irrespective of the N sources. Though plants nodulated, plant dependence on N2 fixation decreased with the addition of NH4NO3. Roots and nodules of the P deficient plants showed an increase in asparagine content, most strikingly so in plants treated with a single source of N. These studies reveal that different legume species of the same genus, may employ contrasting adaptations in order to maintain N nutrition under P deficiency.
AFRIKAANSE OPSOMMING: Die doel van hierdie studie was die bepaling van die wyse waarop fosfaat (P) voeding die biologiese stikstof binding (BNF) deur middel van die effek op N2-bindingsbakterië in die wortelknoppies van Virgilia spesies wat inheems tot die Kaap floraryke area (CFR), Suid Afrika is, affekteer. Drie aparte eksperimente is uitgevoer om die doel te evalueer: Die eerste studie het gepoog om te bepaal hoe 'n fosfaat tekort N voeding van twee peulplant spesies van die Mediterreense Fynbos ekosisteem affekteer. Hierdie studie het getoon dat V. divaricata 'n konstante biomassa tydens verlengde P tekort behou, terwyl V. oroboides ‟n verlaagde biomassa getoon het. V. oroboides het 'n verlaging in voedingskonsentrasies getoon, wat tot 'n verlaging in simbiotiese stikstof binding (SNF) gelei het. Beide plante benut atmosferiese N meer doeltreffend per nodule tydens P tekort. Die maksimum fotosintese in V. oroboides het afgeneem, terwyl V. divaricata sy fotosintese gehandhaaf het. Beide spesies het ook 'n groter koolstof konstruksie koste tydens P tekort gehad. V. divaricata toon duidelike aanpassingsmeganismes tydens P-tekort, aangesien hierdie species sy groei respirasie konhandhaaf. Dit wil voorkom asof die twee peulplant spesies verskillend aangepas is vir P tekort, wat hulle producksie en verspreiding in hulle natuurlike lae P omgewing mag beïnvloed. Die doel van die tweede studie was om te bepaal of grond omgewingskondisies en minerale voedingskonsentrasie 'n belangrike rol speel in die mikrobiese gemeenskappe in die plant risofeer en wortelknoppie vorming tydens N2 binding in peulgewasse. Eerstens het die studie dus gepoog om die samestelling van die N2 bindende bakteriële populasie in die risosfeer en die wortelknoppies van V. divaricata te bepaal. Ten tweede, is die bydrae van die bakterië tot N2-binding tydens P tekort kondisies in die Fynbos omgewing bepaal. In die studie is die effek van fosfaat (P) voeding op die N2-bindende bakteriële gemeenskapstrukture in die Virgilia divaricata risofeer en wortelknoppies in 'n pot eksperiment ondersoek. V. divaricata sade is in fynbos grond as 'n natuurlike inokulum ontkiem, waarna dit na skoon sand kulture oorgedra is en van 500 μM P en 5 μM P voorsien is. Die N2-bindende bakteriële gemeenskappe in die risofeer en wortelknoppies is op grond van die PCR-DGGE band patrone van die 16S rDNA en volgorde bepalingsmetodes ondersoek. Die GenBank Blast resultate het getoon dat V. divaricata doeltreffend deur 'n wye reeks wortel-wortelknoppie bakteriële stamme genoduleer is, insluitende insluitende Burkholderia phytofirmans, Burkholderia sp. en Bradyrhizobium sp. tydens lae P toediening. Die natuurlike 15N voorkoms data het ook bevestig dat 40-50% van die N voeding deur simbiotiese N2 binding bekom is. Dit dien nie net as bewys vir wortelknoppie vorming nie, maar ook 'n aanduiding van die aanpassing van 'n reeks N2 bindende bakteriële stamme/ spesies tot die voedingsarme, sanderige, suur grond van die Mediterreanse ekosisteem van die Fynbos. Die derde studie het die fisiologiese effekte soos bv. N2 fikserings faktore, die afhanklikheid van plante op N2 fiksering, N voorkeur, peulgewas groei, koolstof kostes en aminosuur biosintese tydens P tekort en minerale N toediening soos NH4NO3 in 'n stadig-groeiende, Fynbos peulgewasboom, Virgilia divaricata ondersoek. Volgehoue toediening van NH4NO3 aan die peulplant toon 'n groter toename in plant droë weefsel. Tydens P tekort is die koolstof bou koste meer verhoog in plante wat met twee N bronne voorsien is. Tydens verlengde P tekort het die maksimum fotosintese tempo per blaaroppervlakte toegeneem, ongeag die N bron. Alhoewel die plante wortelknoppies gevorm het, het die plant se afhanklikheid van N2 binding tydens die toediening van NH4NO3 afgeneem. Wortels en wortelknoppies van die P tekort plante het 'n toename in asparagien inhoud getoon, veral in die plante wat met 'n enkele bron van N behandel is.
The DST/NRF-Center of Excellence for Tree Health and Biotechnology, based at the University of Pretoria, for their financial support

The effects of pheromone trap placement on male moth catches of both species were studied. For P. flavedana, traps hung at 2.1 and 3.0 meters captured the greatest number of moths. Trap heights of 1.2, 2.1, and 3.0 meters caught the greatest number of P. idaeusalis moths. The outside-the-canopy trap position captured more P. flavedana moths, while the within-canopy trap location caught the greatest number of P. idaeusalis moths. Traps placed in the west portion of the tree captured the greatest number of P. flavedana moths. P. idaeusalis moth catches were not influenced by compass quadrants. Trap design and pheromone dispenser and rate influenced trap catches of P. flavedana. Development of P. flavedana and P. idaeusalis on a meridic diet was observed at constant temperatures in the laboratory. Lower developmental threshold values for egg, larval, and pupal stages of P. flavedana were: 10.6, 8.6, 9.0°C, respectively. Lower developmental threshold values of 9.7, 7.0, and 8.5°C were estimated for P. idaeusalis egg, larval, and pupal stages, respectively. An average of 101.5 °D_10.6’, 379.6 °D_8.6’, and 126.0 °D_9.0’ were required for development of egg, larval, and pupal stages of P. flavedana, respectively. P. idaeusalis required 104.7 °D_9.7’, 442.7 °D_7.0’, and 132.2 °D_8.5’ to complete development in the egg, larval, and pupal stages, respectively. Differences in rate of development were observed between food sources for both species. Within-tree spatial distribution of egg masses and fruit damage resulting from larval feeding for both species was investigated. P. flavedana egg masses were mostly found in the southern portion of the tree below 1.8 meters. Egg masses of P. idaeusalis were observed in greatest numbers in the southern and eastern quadrants of the tree below 2.8 meters. Fruit damage caused by larvae of both species was greatest in the lower portion of the tree. Wind dispersal of first-instar larvae between trees is believed to have influenced fruit damage distribution. The seasonal activity of P. flavedana and P. idaeusalis was monitored. Degree-day accumulations for first moth catch, first and peak egg deposition, and first and peak egg hatch of both generations are presented.
Ph. D.

Thesis (PhD)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: Plants exhibit a flexible array of morphological, physiological and biochemical adaptations during phosphorous limitation. Legumes are vulnerable to P deficiency, because it affects their ability to fix atmospheric nitrogen (N2). In particular, legumes from nutrient-poor ecosystems, such as the Fynbos in the Cape Floristic Region (CFR) evolved on P deficient soils and may therefore display unique adaptations to soil P stress. In general, very few studies on legumes have focussed on the belowground structures of nodules as a plant organ. Moreover, even less is known about the P stressed responses in nodules from legumes in nutrient-poor ecosystems. The aim of this research was to investigate the metabolic flexibility of organic acid and amino acid metabolism in the nodulated root system of the Fynbos legume Virgilia divaricata, during low P stress. Virgilia divaricata, which grows in the Cape Floristic Region, was used in this study to enhance our knowledge regarding the vital role that the cytosolic enzyme, phosphoenol pyruvate carboxylase (PEPC) plays in phosphoenol pyruvate (PEP) metabolism, in roots and nodules of this legume during phosphate stress. V. divaricata was grown under glasshouse conditions (20 - 25°C) in sterilized quartz sand for 2-3 months whilst being inoculated with the nitrogen fixation bacteria, Burkholderia phytofirmans, which was isolated from V. divaricata nodules grown in fynbos soil. Two phosphate treatments, 5 μM and 500 μM, were applied simulating low-phosphate and high phosphate conditions respectively using a modified Long Ashton Nutrient Solution to simulate a low nutrient ecosystem such as the Cape Floristic Region. Roots and nodules were then analysed for growth kinetics, nutrient acquisition and distribution, enzyme activity and genetic responses. It was shown that during phosphate deficiency, V. divaricata nodules experienced less Pi stress than roots, due to increased metabolic phosphate conservation reactions during organic acid synthesis via an increased PEPC activity. The increased PEPC activity resulted in an increase in downstream metabolic products such as organic acids, (malic acid and citric acid), and amino acids (glutamate, aspartate and asparagine). Although the biological nitrogen fixation (BNF) declined, the high efficiency of BNF may be underpinned by these altered phosphate conservation pathways and enhanced resource allocation during growth particularly under low phosphate (LP) conditions. Therefore, it can be concluded that the efficiency of the nodules via an increased allocation of resources and P acquiring mechanisms in V. divaricata may be the key to the plant’s ability to adapt to poor P environments and thus sustaining its reliance on BNF. From the data obtained as well as previous findings, it has been established that the phosphate conservation mechanisms in roots and nodules, involve the non-adenylate requiring PEPC-bypass route. 13C Nuclear magnetic resonance (NMR) gave us a better understanding regarding the incorporation rates of the PEPCderived C into malate, α-ketoglutarate and asparagine. It therefore is suggested that V. divaricata nodules may use their large PEPC-derived malate pool to prevent large declines in BNF under low phosphate conditions. The nodules of V. divaricata were able to offset an excessive drop in BNF, despite a decline in inorganic phophosphate (Pi) levels. It therefore appears that nodules have evolved to acquire different mechanisms than roots to adapt to phosphate deficiency in order to maintain their function. This was achieved via increased regulation of nodule PEPC and its downstream products. This implies that compared to roots under low P, nodules alter the metabolism of PEPC derived C, in order to maintain nodule respiration and amino acid synthesis. This trait could be observed in the synthesis of larger 13C malate pools of nodules compared to roots, from PEPC, which was underpinned by their different regulation mechanisms of enzyme activity, of the same protein isoform. Since malate is a potent inhibitor of PEPC activity, roots appear to have invested in more PEPC protein compared to nodules. In contrast, nodules with lower PEPC protein, achieved greater enzyme activity than roots, possibly due to higher phosphorylation in order to reduce the malate effect. The subsequent metabolism of this PEPCderived malate, caused roots and nodules to synthesise asparagine via different pathways. These findings imply that roots and nodules under P stress, synthesise their major export amino acid, asparagine, via different routes. This research has generated new knowledge regarding the physiological impact of the organic and amino acid metabolism, derived from PEPC-C in the roots and nodules of legumes growing in nutrient poor ecosystems. It has demonstrated for the first time that the nodules of legume from a nutrient-poor ecosystem rely on improved resource allocation, Pi distribution, and PEPC-derived organic acids to maintain the efficient functioning of N assimilation under P stress. This may be a consequence of having evolved in a nutrient-poor ecosystem, so that nodule-bacteroid respiration and N metabolism can be maintained in P-poor soils such as the Fynbos.
AFRIKAANSE OPSOMMING: Tydens fosfaat stremming maak plante gebruik van buigsame kombinasies van morfologiese, fisiologiese en biochemiese aanpassings. Peulplante is sensitief vir fosfaat tekorte omdat dit die vermoë om atmosferiese stikstof te kan fikseer, grootliks beïnvloed. Peulplante vanuit ekosisteme met mineraal-arme gronde, soos Fynbos binne die Kaapse Blommeryk, het ontwikkel in grond met lae fosfaatvlakke en mag dus unieke aanpassings tot fosfaat tekorte toon. Oor die algemeen is daar baie min peulplant studies wat fokus op die ondergrondse strukture van wortelknoppies as ‘n plant orgaan. Nog minder inligting is beskikbaar oor wortelknoppies, van peulplante, vanuit mineraalarme ekosisteme, se reaksie teenoor ‘n fosfaat tekort. Die doel van hierdie navorsing was om die metaboliese buigsaamheid van organiese- en aminosuur metabolisme in die (nodulated) wortelknoppie-wortelstelsel van die Fynbos peulplant Virgilia divaricata, tydens fosfaat tekort te ondersoek. Virgilia divaricata wat voorkom in die Kaapse Blommeryk, was gebruik in hierdie studie om die huidige kennis te verbeter van die essensiële rol wat die sitisoliese ensiem, fosfo-enol piruvaat karboksilase (PEPC) in fosfo-enol piruvaat metabolisme tydens ‘n fosfaat tekort speel binne die wortels en wortelknoppies van hierdie peulplant. V. divaricata was gegroei onder glashuis toestande (20 - 25°C) in gesteriliseerde kwartssand vir 2-3 maande. Die plante was geïnokuleer met die stikstoffikserende bakterie, Burkholderia phytofirmans, wat geïsoleer is vanaf V. divaricata wortelknoppies wat in Fynbos grond gegroei is. Twee fosfaatbehandelings, 5μM and 500μM, was toegedien om lae en hoë fosfaat toestande, onderskeidelik, na te boots deur gebruik te maak van ‘n aangepasde Long Ashton voedingstofmengsel om ‘n ekosisteem, soos die Kaapse Blommeryk, met lae voedingstofvlakke na te boots. Die wortels en knoppies was geanaliseer ten opsigte van die groeikinetika, opname en verspreiding van voedingstowwe, ensiemaktiwiteit en genetiese aanpassings. Dis is bewys dat tydens fosfaat tekort V. divaricata wortelknoppies minder fosfaat stres ervaar as die wortels, as gevolg van die verhoogde metaboliese fosfaat bewaringsreaksies tydens organise suur sintese via die styging in PEPC aktiwiteit. Die styging in PEPC aktiwiteit lei tot ‘n verhoging in stroomaf metaboliese produkte soos organiese- (appel- en sitroënsuur) en aminosure (glutamaat, aspartaat en asparagien). Alhoewel biologiese stikstoffiksering verlaag het, kan die hoë doeltreffendheid daarvan ondersteun word deur díe aangepasde fosfaat bewarings weë asook verhoogde hulpbron toekenning tydens groei onder lae fosfaat omstandighede. Dit kan dus afgelei word dat die doeltreffendheid van die wortelknoppies via die verhoging in belegging van hulpbronne en fosfaat opname meganismes in V. divaricata moontlik die sleutel is tot die plant se vermoë om aan te pas tot omgewings met lae fosfaatvlakke en sodoende die afhanklikheid van biologiese stikstofbinding te kan onderhou. Data in hierdie as ook vorige studies, wys dat die fosfaat bewaringsmeganismes in wortels en wortelknoppies die PEPC-ompad roete, wat nie adenilaat benodig nie, gebruik. 13C NMR het meer lig gewerp aangaande die vaslegging van koolstof vanaf PEPC na malaat, α-ketoglutaraat en asparagien. Dit word voorgestel dat V. divaricata knoppies ‘n groot hoeveelheid malaat, afkomstig van PEPC-werking, gebruik om groot dalings in biologiese stikstofbinding tydens fosfaat tekort, te verhoed. Die wortelknoppies van V. divaricata kon ‘n oormatige verlaging in biologiese stikstofbinding voorkom ten spyte van die verlaging in fosfaatvlakke. Dit wil voorkom dat wortelknoppies ander meganismes as die wortels ontwikkel het om aan te pas tot fosfaat tekort en sodoende dus hul funksie behou. Dit word bereik deur ‘n verhoging in die regulering van PEPC en die stroomaf produkte in die wortelknoppies. Dit blyk dat wortelknoppies tydens fosfaat te kort, in vergelyking met wortels, die metabolisme van die koolstof vanaf PEPC verander om sodoende respirasie en aminosuursintese te onderhou. Dit wil voorkom dat hierdie meganismes verskil van die van wortel meganismes. Hierdie eienskap kan toegeskryf word aan die produksie van ‘n groter hoeveelheid van 13C malaat vanaf PEPC in die wortelknoppies teenoor die wortels, wat ondersteun word die verskillende reguleringsmeganismes van ensiemaktiwiteit van dieselfde proteïen isoform. Malaat is ‘n kragtige inhibeerder van PEPC-aktiwiteit, dus blyk dit dat die wortels belê in meer PEPC proteïene as die wortelknoppies. In teenstelling, toon die wortelknoppies met laer PEPC proteïene, ‘n hoër ensiem aktiwiteit as die wortels. Dit kan wees as gevolg van hoër fosforilasie om die effek van malaat te verlaag. Die metabolisme van die malaat vanaf PEPC het die sintese van asparagien in die wortels en wortelknoppies via verskillende roetes tot gevolg gehad. Dit impliseer dat tydens ‘n tekort aan fosfaat, wortels en wortelknoppies hul hoof uitvoer aminosuur, asparagien, deur verskillende roetes sintetiseer. Hierdie studie het nuwe kennis aangaande die fisiologiese impak van organiese- en aminosuur metabolisme met koolstof vanaf PEPC in die wortels en wortelknoppies van peulplante wat voorkom in ekosisteme met lae voedingstofvlakke, voortgebring. Vir die eerste keer is dit bewys dat die wortelknoppies vanaf peulplante wat voorkom in mineraal-arme ekosisteme, staatmaak op verbeterde hulpbron beleggings, fosfaat verspreiding en organiese sure vanaf PEPC om die doeltreffendheid van funksionele stikstofassimilasie tydens fosfaat tekort, te onderhou. Dit mag die gevolg wees van, om in ‘n voedingstof arme ekosisteem te ontwikkel sodat die wortelknoppiebakteroïed respirasie en stikstofmetabolisme onderhou kan word in fosfaat arme grond soos die Fynbos.

Prior to 1954, blacks in Fairfax County who wanted to receive an education beyond the seventh grade were bussed by the county to Manassas Regional High School in Prince William County or independently attended Dunbar High School, Phelps Vocational Center, Cardoza High School or Armstrong High School in Washington, D.C. The purpose of this dissertation was to describe, record and analyze the events and actions that led to the establishment, operation, desegregation and eventual demise of Luther P. Jackson High School, the first and on1y high school for blacks in Fairfax County, Virginia. This study provides useful information to the Fairfax County School System. The population for the study consisted of representatives from community and civil rights leaders, school administrators, students, teachers and secretaries who were involved with Luther P. Jackson at various stages of its existence.
Ed. D.

Since its publication and first performance, Edward Albee’s Who’s Afraid of Virginia Woolf?, has often been interpreted with regard to the theme of truth and illusion. A less studied, but nonetheless important, aspect of the drama concerns its relation to C. P. Snow’s concept of the two cultures. In this essay, I argue for the convergence of these two discussions, resulting in an epistemological understanding of Albee. From this mode of interpretation, not only is a rejection of the two cultures noticed, but also a dramatic movement towards a third culture. Thus, Who’s Afraid of Virginia Woolf? is treated as an epistemological drama of ideas.

Thèse (M. Sc.) - Université du Québec à Rimouski, 2005.
Mémoire présenté à l'Université du Québec à Rimouski comme exigence partielle du programme de maîtrise en gestion de la faune et de ses habitats. Titre de lʹécran-titre (visionné le 31 août 2006). Comprend un résumé. CaQRU CaQRU CaQRU Bibliogr.: f. 23-36. Paraît aussi en éd. Imprimée. CaQRU

George P. Knauff's Virginia Reels (1839) was the first collection of southern fiddle tunes and the only substantial one published in the nineteenth century. Knauff's activity could not anticipate our modern contest-driven fiddle subcultures. But the fate of the Virginia Reels pointed in that direction, suggesting that southern fiddling, after his time, would happen outside of commercial popular culture even though it would sporadically engage that culture. This book uses this seminal collection as the springboard for a fresh exploration of fiddling in America, past and present. It first discusses the life of the arranger. Then it explains how this collection was meant to fit into the broad stream of early nineteenth-century music publishing. The book describes the character of these fiddle tunes' names (and such titles in general), what we can learn about antebellum oral tradition from this collection, and how fiddling relates to blackface minstrelsy. Throughout, the book connects the evidence concerning both repertoire and practice found in the Virginia Reels with current southern fiddling, encompassing styles ranging from straightforward to fancy—old-time styles of the Upper South, exuberant West Virginia styles, and the melodic improvisations of modern contest fiddling. Twenty-six song sheets assist in this discovery. The book incorporates performance descriptions and music terminology into his accessible, engaging prose. The book presents an extended look at the history of southern fiddling and a close examination of current practices.

Virginia 1619 provides an opportunity to reflect on the origins of English colonialism around the Chesapeake Bay and the Atlantic world. As the essays here demonstrate, Anglo-Americans have been simultaneously experimenting with representative government and struggling with the corrosive legacy of racial thinking for more than four centuries. Virginia, contrary to popular stereotypes, was not the product of thoughtless, greedy, or impatient English colonists. Instead, the emergence of stable English Atlantic colonies reflected the deliberate efforts of an array of actors to establish new societies based on their ideas about commonwealth, commerce, and colonialism. Looking back from 2019, we can understand that what happened on the shores of the Chesapeake four hundred years ago was no accident. Slavery and freedom were born together as migrants and English officials figured out how to make this colony succeed. They did so in the face of rival ventures and while struggling to survive in a dangerous environment. Three hallmarks of English America--self-government, slavery, and native dispossession--took shape as everyone contested the future of empire along the James River in 1619. The contributors are Nicholas Canny, Misha Ewen, Andrew Fitzmaurice, Jack P. Greene, Paul D. Halliday, Alexander B. Haskell, James Horn, Michael J. Jarvis, Peter C. Mancall, Philip D. Morgan, Melissa N. Morris, Paul Musselwhite, James D. Rice, and Lauren Working.

<p>Condition ratings of bridge components in the Federal Highway Administration (FHWA)’s Structural Inventory and Appraisal database are determined by bridge inspectors in the field, often by visual confirmation or direct- contact sounding techniques. However, the determination of bridge condition ratings is generally subjective depending on individual inspectors’ knowledge and experience, as well as varying field conditions. There are also limitations to access, unsafe working conditions, and negative impacts of lane closures to account for. This paper describes an alternative method to obtaining informative and diagnostic inspection data for concrete bridge decks: mobile nondestructive bridge deck evaluation technology. The technology uses high- definition infrared and visual imaging to monitor bridge conditions over long-term (or desired) intervals. This combination of instruments benefits from rapid and large-scale data acquisition capabilities. Through its implementation in Japan over the course of two decades, the technology is opening new possibilities in a field with much untapped potential. Findings and lessons learned from our experience in the states of Virginia and Pennsylvania are described as examples of highway-speed mobile nondestructive evaluation in action. To validate the accuracy of delamination detection by the visual and infrared scanning, findings were proofed by physical sounding of the target deck structures.</p>