23 research outputs found
Relation between the sedimentary organic record and the climatic oscilations in the Holocene attested by palynofacies and organic geochemical analyses from a pond of altitude in southern Brazil
Reconstructing the CryogenianâEdiacaran evolution of the Porongos fold and thrust belt, Southern Brasiliano Orogen, based on Zircon UâPbâHfâO isotopes
<p>The Neoproterozoic geotectonic triad of the Brasiliano Orogen is reconstructed in southern Brazil from studies focused on the Porongos fold and thrust belt. We integrate field geology with isotopic studies of zircon UâPb SHRIMP and LuâHfâO laser determinations in seven metasedimentary and three metavolcanic rock samples. The results indicate that the Porongos palaeo-basin was derived from mixed sources (3200â550 Ma), with major contributions from Rhyacian (2170 Ma) and Ediacaran (608 Ma) sources. Minor contributions from Archaean to Tonian sources are also registered. The maximum depositional age of the Porongos palaeo-basin is established by the age range of 650â550 Ma with <i>T</i><sub>DM</sub> model ages between 2.5 and 1.3 Ga. The reworked signature (<i>Δ</i><sub>Hf</sub> values = â34 to â4) and the characteristic crustal magma reservoirs (<i>ÎŽ</i><sup>18</sup>O â„5.3 â°) indicate that these sediments are equivalent to Neoproterozoic granites of the Dom Feliciano Belt. The episodic depositional history started in the Cryogenian (650 Ma) and lasted until the Ediacaran (most likely 570 Ma). A magmatic event of Tonian age is recorded in rhyodacite samples interleaved with the metasedimentary rocks and dated at 773, 801, and 809 Ma. The crustal evolution of the Sul-Riograndense Shield included mountain building, folding and thrusting and flexural subsidence in the foreland. An orogenic triad is revealed as the Pelotas Batholith, the Porongos fold and thrust belt and the CamaquĂŁ Basin, all part of the Dom Feliciano Belt.</p
Altura de planta e volume de copa de pessegueiro 'BRS KAMPAI' sobre diferentes porta-enxertos clonais.
Estimates of genomic heritability and genome-wide association study for fatty acids profile in Santa InĂȘs sheep
Background: Despite the health concerns and nutritional importance of fatty acids, there is a relative paucity of studies in the literature that report genetic or genomic parameters, especially in the case of sheep populations. To investigate the genetic architecture of fatty acid composition of sheep, we conducted genome-wide association studies (GWAS) and estimated genomic heritabilities for fatty acid profile in Longissimus dorsi muscle of 216 male sheep.
Results: Genomic heritability estimates for fatty acid content ranged from 0.25 to 0.46, indicating that substantial genetic variation exists for the evaluated traits. Therefore, it is possible to alter fatty acid profiles through selection. Twenty-seven genomic regions of 10 adjacent SNPs associated with fatty acids composition were identified on chromosomes 1, 2, 3, 5, 8, 12, 14, 15, 16, 17, and 18, each explaining â„0.30% of the additive genetic variance. Twenty-three genes supporting the understanding of genetic mechanisms of fat composition in sheep were identified in these regions, such as DGAT2, TRHDE, TPH2, ME1, C6, C7, UBE3D, PARP14, and MRPS30.
Conclusions: Estimates of genomic heritabilities and elucidating important genomic regions can contribute to a better understanding of the genetic control of fatty acid deposition and improve the selection strategies to enhance meat quality and health attributes
Genome-wide association study for performance traits in chickens using genotype by sequencing approach.
Performance traits are economically important and are targets for selection in breeding programs, especially in the poultry industry. To identify regions on the chicken genome associated with performance traits, different genomic approaches have been applied in the last years. The aim of this study was the application of CornellGBS approach (134,528 SNPs generated from a PstI restriction enzyme) on Genome-Wide Association Studies (GWAS) in an outbred F2 chicken population. We have validated 91.7% of these 134,528 SNPs after imputation of missed genotypes. Out of those, 20 SNPs were associated with feed conversion, one was associated with body weight at 35 days of age (P < 7.86E-07) and 93 were suggestively associated with a variety of performance traits (P < 1.57E-05). The majority of these SNPs (86.2%) overlapped with previously mapped QTL for the same performance traits and some of the SNPs also showed novel potential QTL regions. The results obtained in this study suggests future searches for candidate genes and QTL refinements as well as potential use of the SNPs described here in breeding programs.Made available in DSpace on 2018-05-10T01:04:20Z (GMT). No. of bitstreams: 1
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Perfil de metilação diferencial no cromossomo 6 de suĂnos normais e afetados com osteocondrose latens.
Hegel penseur du droit
Les Principes de la philosophie du droit sont l'un des textes les plus lus et les plus controversĂ©s de Hegel. Il sâagit Ă la fois dâun bilan de lâhistoire de la philosophie morale, juridique et politique et dâune analyse audacieuse et « engagĂ©e » de la modernitĂ© post-rĂ©volutionnaire. Pourtant, malgrĂ© sa destination pĂ©dagogique et sa rĂ©daction soignĂ©e, le prĂ©cis de 1820 est dâun abord malaisĂ©, dans la mesure oĂč il ne se soustrait Ă aucune des exigences de ce qui, pour Hegel, garantit la « scientificitĂ© » dâun traitĂ© de philosophie. Il nây a rien dâĂ©tonnant, par consĂ©quent, au fait que les querelles dâinterprĂ©tation les plus violentes aient eu lieu Ă son propos et que la pensĂ©e hĂ©gĂ©lienne du droit ait, tour Ă tour, servi de caution ou de repoussoir aux prises de position politiques les plus diverses. La difficultĂ© du texte mais aussi le caractĂšre stratĂ©gique des thĂšmes abordĂ©s font en effet des Principes de la philosophie du droit un idĂ©al miroir Ă fantasmes. Or ce que lâon nomme la « fin des idĂ©ologies » ouvre la voie Ă une lecture plus sereine (mais peut-ĂȘtre plus exigeante) de la conceptualisation hĂ©gĂ©lienne du droit et pas seulement de ce que Hegel nomme le « droit Ă©tatique », mais aussi du droit privĂ© (« abstrait »), centrĂ© sur la question de la propriĂ©tĂ©, et du droit qu'a lâindividu de voir honorĂ©e sa qualitĂ© de sujet moral agissant. Ce recueil dâĂ©tudes, qui illustre les tendances actuelles de la recherche, propose une lecture Ă la fois synthĂ©tique et dĂ©taillĂ©e de lâouvrage de Hegel en insistant non seulement sur sa dimension « systĂ©matique » et spĂ©culative, mais aussi sur ses prises de position les plus novatrices. Il ne sâagit pas de prĂ©tendre que Hegel soit avant tout un philosophe du droit, encore moins de mettre entre parenthĂšses le puissant soubassement mĂ©taphysique ou spĂ©culatif de sa doctrine de lâesprit objectif, mais de rĂ©Ă©valuer ce moment du systĂšme et de tirer parti des appuis qu'il peut offrir Ă la philosophie contemporaine