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O uso variável do pronome de segunda pessoa você(s)/cês(s) na cidade de São Paulo; The variable use of the second person pronoun você(s)/cê(s) in the city of São Paulo

Nascimento, Ivanete Belem do
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/02/2011 PT
Relevância na Pesquisa
26.99%
Esta dissertação trata da variação no uso do pronome de segunda pessoa (singular e plural) na cidade de São Paulo. Duas formas alternativas são empregadas nessa comunidade de fala: a variante plena você(s) e a forma foneticamente reduzida cê(s). A pesquisa é desenvolvida de acordo com os pressupostos teórico-metodológicos da Sociolinguística Variacionista. Foram desenvolvidas análises sincrônica e diacrônica com dados extraídos de duas amostras (NURC-SP-1970 e GESOL-SP-2000). Os resultados evidenciam um equilíbrio na distribuição das duas variantes nessa comunidade de fala. Embora se verifique uma típica mudança em progresso (tempo aparente) na década de 1970, a análise dos anos 2000 revela um caso de variação estável na comunidade de fala. Nos anos 2000, a variante inovadora, a forma reduzida cê, tende a ser favorecida pelos informantes mais jovens e pelas mulheres acima de 50 anos de idade. Cê é desfavorecida entre os indivíduos de uma faixa etária intermediária (entre 35 e 45 anos) o que pode estar relacionado a questões de monitoramento da fala e ao mercado linguístico (Paiva & Duarte, 2003). Adicionalmente, cê tende a ser evitado entre os indivíduos mais escolarizados; e é favorecido em interações cujos informantes são familiares ou amigos. De um ponto de vista linguístico...

Efeito da escovação na resistência à corrosão do titânio cp; The effect ofd brushingand corrosion on cp titanium

Pinto, Gustavo da Col dos Santos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/04/2014 PT
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17.84%
O uso de ligas metálicas na odontologia continua tendo aplicação em grande número de situações clínicas de próteses convencionais ou sobre implantes. O objetivo deste estudo foi avaliar a corrosão superficial do Ti cp, submetido a processo de escovação. Foram confeccionados espécimes, com 15,0 mm de diâmetro e 2,5 mm de espessura, obtidos pelo método de fundição por cera perdida. Em seguida, divididos em 4 grupos (n=6). Ensaios eletroquímicos e escovação mecânica (abrasão) foram realizados. Para a análise de Potencial em Circuito Aberto (OCP), o período de mensuração foi de 1 hora, com leitura do potencial da amostra a cada 0,6 segundos. No Grupo G1 foi realizada a análise de Pontecial em Circuito Aberto (OCP), em seguida, aplicado um Potencial Anódico a -250 mV por 1 hora e logo após, realizada a Espectroscopia de Impedância Eletroquímica (EIS) à -250mV. Para o Grupo G2 foi realizada a análise de OCP, em seguida, aplicado um Potencial Catódico a +1000 mV por 1 hora e logo após, realizada a EIS à +1000 mV. Os Grupos G1 e G2 não foram submetidos ao teste de escovação mecânica. O Grupo G3 foi submetido, primeiramente, ao ensaio de escovação mecânica, sendo a máquina acionada até atingir 14.600 ciclos...

Estudo da influência dos íons K+, Mg2+, SO4 2- e CO3 2- na cristalização biomimética de fosfato de cálcio amorfo (ACP) e conversão a fosfato octacálcico (OCP)

Aparecida, Anahí Herrera; Fook, Marcus Vinícius Lia; Dos Santos, Márcio Luis; Guastaldi, Antonio Carlos
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 892-896
POR
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The crystallization of hydroxyapatite (HA) in aqueous solution can be described by the mechanism ACP → OCP → HA. In this work, it was studied the influence of K+, Mg2+, SO4 2- AND CO3 2- ions in the formation of ACP and in its conversion to OCP, using biomimetic coatings on metallic substrates of commercially pure titanium (Ti c.p.). The results showed that Mg2+ and CO3 2- ions favored both the formation of ACP and its conversion to OCP. Differently, K+ and SO4 2- ions did not influence the formation of ACP and, consequently, interfered in the conversion to OCP.

Interpretative model of shearband boudins internal evolution in HT ductile shear zones

Rodrigues, Benedito C.; Peternell, Mark; Moura, António; Schwindinger, Martin; Pamplona, J.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2012 ENG
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The internal structure of a shearband boudin resulting from an original igneous, hydrothermal or metamorphic segregation tabular rigid body is a subject of scientific interest. It allows understanding the deformation mechanisms acting on homogeneous quartz aggregate activated during simple shear progressive deformation. This work is focused on the characterization of the internal evolution of shearband boudins, using microtextural analysis, fluid inclusions studies, fractal and OCP analysis. The proposed interpretative model shows the several structural stages that can be well established during the process of the internal evolution of shearband boudin.

Estudo da influência dos íons K+, Mg2+, SO4(2-) e CO3(2-) na cristalização biomimética de fosfato de cálcio amorfo (ACP) e conversão a fosfato octacálcico (OCP)

Aparecida,Anahí Herrera; Fook,Marcus Vinícius Lia; Santos,Márcio Luis dos; Guastaldi,Antonio Carlos
Fonte: Sociedade Brasileira de Química Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2007 PT
Relevância na Pesquisa
27.57%
The crystallization of hydroxyapatite (HA) in aqueous solution can be described by the mechanism ACP -> OCP -> HA. In this work, it was studied the influence of K+, Mg2+, SO4(2-) and CO3(2-) ions in the formation of ACP and in its conversion to OCP, using biomimetic coatings on metallic substrates of commercially pure titanium (Ti c.p.). The results showed that Mg2+ and CO3(2-) ions favored both the formation of ACP and its conversion to OCP. Differently, K+ and SO4(2-) ions did not influence the formation of ACP and, consequently, interfered in the conversion to OCP.

Effect of sterilization on the properties of CDHA-OCP-beta-TCP biomaterial

Morejón-Alonso,Loreley; Carrodeguas,Raúl García; García-Menocal,José Ángel Delgado; Pérez,José Antonio Alonso; Manent,Salvador Martínez
Fonte: ABM, ABC, ABPol Publicador: ABM, ABC, ABPol
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2007 EN
Relevância na Pesquisa
27.27%
The effect of the method of sterilization on the physical, chemical and mechanical properties of a new bone repairing material was studied. The material was obtained by thermal hydrolysis of beta-tricalcium phosphate/orthophosphoric acid cement and was composed of calcium deficient hydroxyapatite, octacalcium phosphate (OCP), and beta-tricalcium phosphate. Partial decomposition of the OCP was observed after sterilization for the three methods. Decomposition increased to the following sequence of sterilization methods: ethylene oxide; autoclaving; dry oven. On the other hand, mechanical strength decreased with regard to non sterilized material in the sterilization sequence: ethylene oxide; dry oven; autoclaving. The compressive strength was 8.5 ± 1.0; 9.0 ± 1.2; 8.2 ± 0.8 and 6.5 ± 1.0 MPa, whereas diametral tensile strength was 2.1 ± 0.3; 2.5 ± 0.1; 1.9 ± 0.9 and 1.6 ± 0.3 for the material sterilized by ethylene oxide, dry oven, and autoclaving, respectively. Several compositional and microstuctural changes were detected after dry heat and autoclave sterilization. Ethylene oxide sterilization had lesser effect on the chemical composition and strength than dry heat and autoclaving.

Light-Induced Energy Dissipation in Iron-Starved Cyanobacteria: Roles of OCP and IsiA Proteins[W]

Wilson, Adjélé; Boulay, Clémence; Wilde, Annegret; Kerfeld, Cheryl A.; Kirilovsky, Diana
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Publicado em /02/2007 EN
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In response to iron deficiency, cyanobacteria synthesize the iron stress–induced chlorophyll binding protein IsiA. This protein protects cyanobacterial cells against iron stress. It has been proposed that the protective role of IsiA is related to a blue light–induced nonphotochemical fluorescence quenching (NPQ) mechanism. In iron-replete cyanobacterial cell cultures, strong blue light is known to induce a mechanism that dissipates excess absorbed energy in the phycobilisome, the extramembranal antenna of cyanobacteria. In this photoprotective mechanism, the soluble Orange Carotenoid Protein (OCP) plays an essential role. Here, we demonstrate that in iron-starved cells, blue light is unable to quench fluorescence in the absence of the phycobilisomes or the OCP. By contrast, the absence of IsiA does not affect the induction of fluorescence quenching or its recovery. We conclude that in cyanobacteria grown under iron starvation conditions, the blue light–induced nonphotochemical quenching involves the phycobilisome OCP–related energy dissipation mechanism and not IsiA. IsiA, however, does seem to protect the cells from the stress generated by iron starvation, initially by increasing the size of the photosystem I antenna. Subsequently...

Granule Size–Dependent Bone Regenerative Capacity of Octacalcium Phosphate in Collagen Matrix

Tanuma, Yuji; Anada, Takahisa; Honda, Yoshitomo; Kawai, Tadashi; Kamakura, Shinji; Echigo, Seishi; Suzuki, Osamu
Fonte: Mary Ann Liebert, Inc. Publicador: Mary Ann Liebert, Inc.
Tipo: Artigo de Revista Científica
EN
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The present study was designed to determine whether the osteoconductivity of octacalcium phosphate–collagen (OCP/Col) composite can be improved by controlling the granule size of OCP. The granules of synthetic OCP, with diameters in the range of 53 to 300, 300 to 500, and 500 to 1000 μm, were used as an inorganic source of composite materials mixed with atelo-Col. After vacuum dehydrothemal treatment, OCP/Col disks were implanted into critical-sized calvaria defects in Wistar rats for 4, 8, and 12 weeks and examined radiographically, histologically, histomorphometrically, and histochemically. The materials were characterized according to mercury intrusion porosimetry and scanning electron microscopy. X-ray diffraction was performed before and after implantation. The dissolution of OCP crystals in a Col matrix was determined by immersing OCP/Col disks in a culture medium. OCP/Col had a constant pore size (∼30 μm) regardless of OCP granule size. OCP in the Col matrix tended to convert to hydroxyapatite (HA) during the implantation. OCP/Col with the smallest granules of OCP enhances both bone regeneration and biodegradation the most through tartrate-resistant acid phosphatase (TRAP)-positive osteoclastic cellular resorption of OCP granules. The smallest OCP granules in the Col matrix showed the highest dissolution and had the greatest potential to form HA. The results indicated that the size of the included OCP granules can controll the osteoconductivity of OCP/Col. The overall results suggest that the physicochemical property of OCP crystals is a factor that determines the bone regenerative capacity of OCP/Col in critical-sized calvaria large bone defects in rats.

Crystal structure of the FRP and identification of the active site for modulation of OCP-mediated photoprotection in cyanobacteria

Sutter, Markus; Wilson, Adjélé; Leverenz, Ryan L.; Lopez-Igual, Rocio; Thurotte, Adrien; Salmeen, Annette E.; Kirilovsky, Diana; Kerfeld, Cheryl A.
Fonte: National Academy of Sciences Publicador: National Academy of Sciences
Tipo: Artigo de Revista Científica
EN
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Photosynthetic reaction centers are sensitive to high light conditions, which can cause damage because of the formation of reactive oxygen species. To prevent high-light induced damage, cyanobacteria have developed photoprotective mechanisms. One involves a photoactive carotenoid protein that decreases the transfer of excess energy to the reaction centers. This protein, the orange carotenoid protein (OCP), is present in most cyanobacterial strains; it is activated by high light conditions and able to dissipate excess energy at the site of the light-harvesting antennae, the phycobilisomes. Restoration of normal antenna capacity involves the fluorescence recovery protein (FRP). The FRP acts to dissociate the OCP from the phycobilisomes by accelerating the conversion of the active red OCP to the inactive orange form. We have determined the 3D crystal structure of the FRP at 2.5 Å resolution. Remarkably, the FRP is found in two very different conformational and oligomeric states in the same crystal. Based on amino acid conservation analysis, activity assays of FRP mutants, FRP:OCP docking simulations, and coimmunoprecipitation experiments, we conclude that the dimer is the active form. The second form, a tetramer, may be an inactive form of FRP. In addition...

Molecular Mechanism of Photoactivation and Structural Location of the Cyanobacterial Orange Carotenoid Protein

Zhang, Hao; Liu, Haijun; Niedzwiedzki, Dariusz M.; Prado, Mindy; Jiang, Jing; Gross, Michael L.; Blankenship, Robert E.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
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17.92%
The Orange Carotenoid Protein (OCP) plays a similar photoprotective role in cyanobacterial photosynthesis to that of non-photochemical quenching in higher plants. Under high-light conditions, OCP binds to the phycobilisome (PBS) and reduces energy transfer to the photosystems. The protective cycle starts from a light-induced activation of OCP. Detailed information on the molecular mechanism of this process as well as the subsequent recruitment of active OCP to the phycobilisome is not known. We report here our investigation on OCP photoactivation from the cyanobacterium Synechocystis sp. PCC 6803 by using a combination of native mass spectrometry (MS) and protein cross-linking. We demonstrate that Native MS is able to capture OCP with its intact pigment and further reveal that OCP undergoes a dimer-tomonomer transition upon light illumination. The reversion of activated form of OCP to inactive, dark form was also observed by using native MS. Furthermore, in vitro reconstitution of OCP and PBS allowed to perform protein chemical cross-linking experiments. LC-MS/MS analysis identified cross-linking species between OCP and the PBS core components. Our result indicates that the N-terminal domain of OCP is closely involved in the association with a site formed by two allophycocyanin trimers in the basal cylinders of the phycobilisome core. This report helps to understand the activation mechanism of OCP and the structural binding site of OCP during the cyanobacterial non-photochemical quenching process.

Effects of Ovarian Hormones and Oral Contraceptive Pills on Cardiac Vagal Withdrawal at the Onset of Dynamic Exercise

Teixeira, André L.; Ramos, Plinio S.; Vianna, Lauro C.; Ricardo, Djalma R.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 18/03/2015 EN
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The purpose of this study was to investigate the effects of the ovarian hormones and the use of oral contraceptive pills (OCP) on cardiac vagal withdrawal at the onset of dynamic exercise. Thirty physically active women aged 19–32 years were divided into two groups: OCP users (n = 17) and non-OCP users (n = 13). Participants were studied randomly at three different phases of the menstrual cycle: early follicular (day 3.6 ± 1.2; range 1–5), ovulatory (day 14.3 ± 0.8; range 13–16) and midluteal (day 21.3 ± 0.8; range 20–24), according to endogenous (in non-OCP users) or exogenous (in OCP users) estradiol and progesterone variations. The cardiac vagal withdrawal was represented by the cardiac vagal index (CVI), which was obtained by the 4-s exercise test. Additionally, resting heart rate, systolic (SBP) and diastolic blood pressure (DBP) were obtained. The CVI was not significantly different between the three phases of the menstrual cycle in either the non-OCP users (early follicular: 1.58 ± 0.1; ovulatory: 1.56 ± 0.1; midluteal: 1.58 ± 0.1, P > 0.05) or OCP users (early follicular: 1.47 ± 0.1; ovulatory: 1.49 ± 0.1; midluteal: 1.47 ± 0.1, P > 0.05) (mean ± SEM). Resting cardiovascular responses were not affected by hormonal phase or OCP use...

The Office of Combination Products: Its Roots, Its Creation, and Its Role

Schillinger, Danielle C.
Fonte: Harvard University Publicador: Harvard University
Tipo: Paper (for course/seminar/workshop)
EN_US
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The Office of Combination Products (OCP), within the Food and Drug Administration (FDA), was created formally by statute in December, 2002. Upon its creation, the Office became broadly responsible for overseeing the regulation of combination products, or products that involve components that would normally be regulated under different FDA Centers. But the statutory creation of this Office in one day represented the culmination of nearly sixty-five years of both technological advancement in the products submitted to the FDA and amassed experience within the FDA and its administrative predecessors for managing those products in the name of the public safety. To understand the need for this Office and its primary goals of timely, effective and clear regulation of these groundbreaking technologies, the history of the FDA with respect to the advent of these combination products must be examined chronologically. Drafts of statutes, administrative proposals offered for public comment, and lengthy debates from Capitol Hill all illustrate the journey that led inevitably to the OCP as a final destination. Nearly twenty-four months have passed since the OCP was created, so an analysis of its initial progress through an explanation of the changes it has effected is necessary. Both combination product manufacturers and FDA jurisdiction officers have benefited from industry guidances...

The Onchocerciasis Control Programme in West Africa (OCP)

Boatin, B.
Fonte: Banco Mundial Publicador: Banco Mundial
Tipo: Artigo de Revista Científica
EN
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27.45%
The Onchocerciasis Control Programme in West Africa (OCP) started operations in 1975. Its main objectives were to eliminate human onchocerciasis, as a disease of public-health importance and an obstacle to socio-economic development, from the Programme area. By the end of 2002, the OCP covered 11 West African countries, and had introduced large-scale Mectizan (ivermectin) distribution to about 10 million people, through the communitydirected treatment approach, with treatment coverages ranging from 51%-81%. Research on large-scale Mectizan use illustrated the importance of evidence-based results, the power of multicountry studies, the need for social science in community-driven endeavours and operations research, and the value of empowering communities as allies in disease control. The generous donation of Mectizan by Merck & Co., Inc., has increased general interest in health-related public-private partnerships and generated the momentum for other donations to tackle other diseases. The vector control on which the OCP was initially based successfully interrupted the transmission of the parasite causing human onchocerciasis, Onchocerca volvulus, in many areas. The introduction of Mectizan led to the decline in anterior-segment lesions in the eye and the arrest of posterior-segment lesions. The drug continues to be highly effective in morbidity control...

The Onchocerciasis (Riverblindness) Programs Visionary Partnerships; Les programmes de lutte contre l'onchocercose (cecite des rivieres)

Benton, Bruce
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Brief; Publications & Research
ENGLISH
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The Onchocerciasis Control Program (OCP) was created in 1974 with two primary objectives. The first is the elimination of onchocerciasis as a public health problem and as an obstacle to socioeconomic development throughout an eleven-country area. The second is to leave participating countries in a position to maintain this achievements by enhancing national capacity to maintain control of the disease. The principal tool has been vector control. By eliminating the intermediate host by killing the fly larvae, vector control effectively interrupts transmissions of the disease. In the late eighties, the program initiated the distribution of Mectizan as a complementary method of control. The OCP program has been hailed as one of the most successful partnerships in the history of development assistance. The results of the program include: 1) virtually halting transmission of onchocerciasis throughout the eleven-country program area; 2) preventing 600,000 cases of blindness by the conclusion of the program in 2002; 3) sparing 16 million children born since the program's inception from any risk of contracting onchocerciasis; and 4) freeing up estimated 25 million hectares of arable land for resettlement and cultivation.

Plan de mercadeo para la empresa herrajes y Cremalleras OCP ubicada en Bogotá D.C.

Gómez hernández, Michoel Andrés
Fonte: Universidade de La Salle Publicador: Universidade de La Salle
Tipo: bachelorThesis; Trabajo de grado Formato: 123 h.; Tesis en papel y en CD
SPA
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Tesis (Administrador de Empresas). -- Universidad de La Salle. Facultad de Ciencias Administrativas y Contables. Programa de Administración de Empresas, 2009; Bogotá : Universidad de La Salle. Facultad de Ciencias Administrativas y Contables. Programa de Administración de Empresas , 2009

Identification of a protein required for recovery of full antenna capacity in OCP-related photoprotective mechanism in cyanobacteria

Boulay, Clémence; Wilson, Adjélé; D'Haene, Sandrine; Kirilovsky, Diana
Fonte: National Academy of Sciences Publicador: National Academy of Sciences
Tipo: Artigo de Revista Científica
EN
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High light can be lethal for photosynthetic organisms. Similar to plants, most cyanobacteria protect themselves from high irradiance by increasing thermal dissipation of excess absorbed energy. The photoactive soluble orange carotenoid protein (OCP) is essential for the triggering of this photoprotective mechanism. Light induces structural changes in the carotenoid and the protein, leading to the formation of a red active form. Through targeted gene interruption we have now identified a protein that mediates the recovery of the full antenna capacity when irradiance decreases. In Synechocystis PCC 6803, this protein, which we called the fluorescence recovery protein (FRP), is encoded by the slr1964 gene. Homologues of this gene are present in all of the OCP-containing strains. The FRP is a 14-kDa protein, strongly attached to the membrane, which interacts with the active red form of the OCP. In vitro this interaction greatly accelerates the conversion of the red OCP form to the orange form. We propose that in vivo, FRP plays a key role in removing the red OCP from the phycobilisome and in the conversion of the free red OCP to the orange inactive form. The discovery of FRP and its characterization are essential elements in the understanding of the OCP-related photoprotective mechanism in cyanobacteria.

Equipes nationales entomologiques de la zone d'extension ouest du programme de lutte contre l'onchocercose en Afrique de l'ouest (OCP) de 1986 à 1990.

Sékétéli, A.; Guillet, P.; Coloussa, B.; Philippon, B.; Quillévéré, D.; Samba, E. M.
Fonte: World Health Organization Publicador: World Health Organization
Tipo: Artigo de Revista Científica
Publicado em //1993 EN
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27.84%
The western extension area of the Onchocerciasis Control Programme in West Africa (OCP) covers five countries: Guinea, Guinea-Bissau, Mali (western part), Senegal and Sierra Leone. From 1986 to 1990, national teams employed by the respective governments have been regularly collecting entomological data on the vectors of onchocerciasis in these countries. As in the initial programme area of the OCP, the entomological surveillance network was composed of entomological sectors and subsectors (the latter are called "operational bases" in the western extension). In 1990, 308 staff in 47 capture teams were employed for the entomological surveillance activities in seven sectors and twenty-five operational bases. They included a national coordinator as head of the teams for each country, a wide range of technicians, and administrative support staff to assist the national coordinator in the overall management of available resources. The national teams worked under the technical responsibility and supervision of WHO/OCP but with no employee/employer relationship between them and WHO, since they were employed and their salaries were paid by their governments. The OCP, however, paid additional lump sum allowances to each worker, as well as daily subsistence allowances when away from their duty station. Vehicles...

OCP Effects in Catalan Cliticization

Bonet i Alsina, M. Eulàlia; Lloret, Maria-Rosa
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Article; info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2002 ENG
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In Catalan, sequences of sibilants are never pronounced as such. In most contexts all varieties coincide in the «strategies» used to avoid these sequences, namely epenthesis or deletion. Variation is only found in the domain of pronominal clitics (but not with other types of clitics). One source of variation is accounted for by decomposing a general constraint into two specific ones, which implies partial constraint reranking. The other source of variation, which involves a case of apparent opacity, is explained through an Output-Output constraint that makes reference to paradigmatic relations.; En català les seqüències de sibilants no es pronuncien mai com a tals. En la majoria de contextos totes les varietats coincideixen pel que fa a les «estratègies» que utilitzen per evitar aquestes seqüències, que poden ser l’epèntesi o l’elisió. La variació només es troba en el domini dels clítics pronominals (però no en el d’altres menes de clítics). Una de les fonts de variació s’explica mitjançant la divisió d’una restricció general en dues restriccions més específiques, la qual cosa implica una reordenació parcial de restriccions. L’altra font de variació, que inclou un cas d’opacitat aparent, s’explica mitjançant una restricció del tipus output-output que fa referència a relacions paradigmàtiques.

Do Princípio do Contorno Obrigatório e línguas faladas no Brasil

Soares, Marília Facó; Damulakis, Gean Nunes
Fonte: Faculdade de Letras da Universidade Federal de Minas Gerais Publicador: Faculdade de Letras da Universidade Federal de Minas Gerais
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Avaliado pelos pares Formato: application/pdf
Publicado em 31/12/2007 POR
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Bringing into scene the theoretical route followed by The ObrigatoryContour Principle (OCP), Kaingáng; Parkatêjê; Je languages; Tonallanguages, the present article has, among its aims: to contribute tothe determination of the nature of such principle and to get evidencefor a possible parameterization of it. In order to do so, we, based onspecific phonological apects of some languages (genetically relatedor not) spoken in Brasil, will investigate them from the point of viewof two interrelated theoretical questions which are still accepted,even in a representational model, and which refer to OCP evaluationalcontexts and its weakening from certain distances. The conclusionsreached here allow us to sustain the hypothesis that the nature ofOCP is linked to features involving articulation and perception. Theyalso allow us to suggest that the OCP can be parameterized: its evaluationcontexts can be minimally altered, according to the language, and itsapplication is not affected by other restrictions with which it interacts.

THEORETICAL STUDY OF OCTOCALCIUM PHOSPHATE-HYDROXYAPATITE (OCP-HA) INTERFACE MODEL

Fernández,M. E; Ascencio,J. A; Zorrilla-Cangas,C; García,R; Reyes-Gasga,J
Fonte: Universidad Simón Bolívar; ; Publicador: Universidad Simón Bolívar; ;
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2002 EN
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Some experimental results indicate that HA and OCP can form an epitaxial interface with a minimum of interfacial energy, producing a smooth HA-OCP interface. The OCP-HA interface has become of great biological interest in the context of mineralized tissue formation. In this work we present the high-resolution transmission electron microscopy (HREM) simulated images obtained from a model of the OCP-HA interface generated after the ideas of Brown et al [1,2,3]. And from this model, based in the idea that the CDL corresponds to an epitaxially growth of HA on the OCP surface, a model for this planar defects also presented. Simulated images were obtained by the multislice method using the atomic positions for Ca, P, O and H as determined by Kay et al. [4] for HA and Brown [2] for OCP respectively. We calculate the model stability by quantum mechanics methods for Brown´s model after relaxation, the atoms had a split of 0.27 Å approximately. In our model the atoms after relaxation kept the same positions.