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| Registros recuperados: 176 | |
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| Carvalho,Margarida Lima; Oliveira,Claudio; Foresti,Fausto. |
| The family Gasteropelecidae is composed of three genera and eight species. This study shows that Thoracocharax cf. stellatus has 2n = 52 chromosomes for both sexes. The five males studied showed 8 metacentric, 16 submetacentric, 4 subtelocentric, and 24 acrocentric chromosomes; the seven females showed only one submetacentric chromosome, belonging to pair 11, and one extra acrocentric chromosome, smaller than all the other chromosomes, characterizing the presence of a ZZ/ZW sex chromosome system in this species. Nucleolus organizing regions (NORs) were detected on the short arms of the subtelocentric chromosome pair 13. Constitutive heterochromatin was identified at pericentromeric and terminal positions in almost all chromosomes. The W chromosome was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sex chromosomes; ZW; DNA content; Fish; Evolution. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300008 |
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| Le Roux, Frederique. |
| Global changes linked to increases in temperature and ocean acidification, but also to more direct anthropogenic influences such as aquaculture, have caused a worldwide increase in the reports of Vibrio-associated illnesses affecting humans and also animals such as shrimp and molluscs. Investigation of the emergence of Vibrio pathogenesis events requires the analysis of microbial evolution at the gene, genome and population levels, in order to identify genomic modifications linked to increased virulence, resistance and/or prevalence, or to recent host shift. From a more applied point of view, the elucidation of virulence mechanisms is a prerequisite to devising prophylactic methods to fight infectious agents. In comparison with human pathogens, fairly... |
| Tipo: Text |
Palavras-chave: Écologie; Émergence; Évolution; Invertébrés marins; Vibriose; Virulence; Ecology; Emergence; Evolution; Marine invertebrate; Vibriosis; Virulence. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00344/45560/46722.pdf |
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| Finardi, Corrado; Arfini, Filippo; Turrini, Aida. |
| The present study intends to shed light, both from a descriptive and investigative point of view on the dietary evolution taking place in Europe during last 45 years, using secondary data from FAO FBS, which can cover the entire time span considered and allow for several extrapolation and timeseries analysis, differently than single survey data.. After a clustering of selected european national diets, using specific metrics with respect both to internal and external variety (as measured by appropriate indicators), we intended to check the actual distance that average, national diets have in front of the so called Food Pyramid, which consists in a balance of several food items in adequate proportions and in fact glorifies the healthy virtues of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Diets; Evolution; Clustering; Food pyramid; Europe; Trade; GI; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; E37; Q18. |
| Ano: 2010 |
URL: http://purl.umn.edu/116443 |
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| Torres García, Jesús Rubén. |
| Las malezas compiten intensamente con los cultivos, por lo cual, los agricultores emplean prácticas de control (manual, mecánico y químico) para eliminarlas. Los herbicidas ejercen una presión de selección extrema (99.99%) sobre las poblaciones. Como consecuencia, en unas pocas generaciones se observan individuos resistentes (R) en las poblaciones de maleza. La resistencia a herbicidas es un proceso evolutivo causado por cambios metabólicos o genéticos. En algunas especies la resistencia va acompañada de una disminución en la aptitud competitiva (fitness). Esto puede ocasionar que las plantas resistentes sean desplazadas cuando el factor de selección se retire de las poblaciones. Phalaris minor (Poaceae) es una maleza que evolucionó hacia la adquisición de... |
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Palavras-chave: Fitness; Costo de la resistencia; Evolución; Ecología evolutiva; Doctorado; Botánica; Cost of resistance; Evolution; Evolutionary ecology. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1778 |
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| Marie, Benjamin; Joubert, Caroline; Tayale, Alexandre; Zanella-cleon, Isabelle; Belliard, Corinne; Piquemal, David; Cochennec-laureau, Nathalie; Marin, Frederic; Gueguen, Yannick; Montagnani, Caroline. |
| Mollusca evolutionary success can be attributed partly to their efficiency to sustain and protect their soft body with an external biomineralized structure, the shell. Current knowledge of the protein set responsible for the formation of the shell microstructural polymorphism and unique properties remains largely patchy. In Pinctada margaritifera and Pinctada maxima, we identified 80 shell matrix proteins, among which 66 are entirely unique. This is the only description of the whole "biomineralization toolkit" of the matrices that, at least in part, is thought to regulate the formation of the prismatic and nacreous shell layers in the pearl oysters. We unambiguously demonstrate that prisms and nacre are assembled from very different protein repertoires.... |
| Tipo: Text |
Palavras-chave: Mantle; Mollusk shell matrix proteins; Proteome; Transcriptome; Evolution. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00118/22959/20922.pdf |
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| Castro,Jonathan P.; Moura,Maurício O.; Moreira-Filho,Orlando; Shibatta,Oscar A.; Santos,Mateus H.; Nogaroto,Viviane; Vicari,Marcelo R.; Almeida,Mara C. de; Artoni,Roberto F.. |
| Two populations of the Astyanax scabripinniscomplex, isolated by a waterfall with over 100 meters depth and inhabiting different altitudes of the same river (1850 m a.s.l. and 662 m a.s.l.) were compared in reproductive data, geometric morphometry, tooth morphology, anal-fin rays counts, and karyotype, in order to test the hypothesis of speciation between the two populations. The results in the geometric morphometry analysis showed differences between the populations. Discriminant function analysis (DFA) and canonical variance analysis revealed sexual dimorphism. Secondary sexual characters, such as hooks in the anal fin rays of the males are absent in the lower altitude population. Both populations had the same macro karyotype structure, except for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allopatric populations; Cytogenetics; Evolution; Geometric morphometry; Paraíba do Sul River. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200429 |
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| Lanna,Emilio. |
| The non-bilaterian animals comprise organisms in the phyla Porifera, Cnidaria, Ctenophora and Placozoa. These early-diverging phyla are pivotal to understanding the evolution of bilaterian animals. After the exponential increase in research in evolutionary development (evo-devo) in the last two decades, these organisms are again in the spotlight of evolutionary biology. In this work, I briefly review some aspects of the developmental biology of nonbilaterians that contribute to understanding the evolution of development and of the metazoans. The evolution of the developmental genetic toolkit, embryonic polarization, the origin of gastrulation and mesodermal cells, and the origin of neural cells are discussed. The possibility that germline and stem cell... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Early-diverging metazoans; BMP; FGF; Wnt; Stem cells; Evolution; Nervous system. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000300284 |
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| Soletchnik, Patrick; Le Moine, Olivier; Polsenaere, Pierre. |
| Dans le contexte du changement global dont la cause anthropique est maintenant reconnue, cette étude dresse un bilan de l’évolution hydro-climatique des Pertuis Charentais (Bassin de Marennes-Oléron) depuis les quarante dernières années. Elle présente une comparaison de la situation hydro-climatique avant et après la « rupture thermique » des années 80-90, reconnue à l’échelle de l’hémisphère Nord et mise également en évidence dans les Pertuis entre 1983-1997. Les deux périodes comparées sont (1977-1991) d’une part et (2000-2015) d’autre part. Entre les deux, l’élévation des températures de l’eau de mer de 1,5°C en moyenne et 3°C en médiane, s’est accompagnée d’une élévation de la salinité (0,6 à 0,9) en lien avec un déficit d’apport des fleuves internes... |
| Tipo: Text |
Palavras-chave: Hydrologie; Hydro-climat; Hydrodynamique; Bassin de Marennes-Oléron; Evolution; Réchauffement climatique; Apports; Fleuves; Température; Salinité; Nutriments; Chlorophylle a. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00387/49815/50391.pdf |
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| Circadian organization means the way in which the entire circadian system above the cellular level is put together physically and the principles and rules that determine the interactions among its component parts which produce overt rhythms of physiology and behavior. Understanding this organization and its evolution is of practical importance as well as of basic interest. The first major problem that we face is the difficulty of making sense of the apparently great diversity that we observe in circadian organization of diverse vertebrates. Some of this diversity falls neatly into place along phylogenetic lines leading to firm generalizations: i) in all vertebrates there is a "circadian axis" consisting of the retinas, the pineal gland and the... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Circadian rhythms; Evolution; Vertebrates; Pineal; SCN; Retina; Melatonin. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000300003 |
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| Olavarria,Viviana Nilla; Gomes,Alline do Nascimento; Kruschewsky,Ramon de Almeida; Galvão-Castro,Bernardo; Grassi,Maria Fernanda Rios. |
| INTRODUCTION: Variations in human T cell lymphotropic virus type 1 (HTLV-1) proviral load (PVL) in infected individuals over time are not well understood. Objective: To evaluate the evolution of proviral load in asymptomatic individuals and HAM/TSP patients in order to help determine periodicity for measuring proviral load. METHODS: A group of 104 HTLV-1 infected patients, followed at the HTLV reference center in Salvador, Brazil, were included in the study (70 asymptomatic and 34 HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) patients). HTLV-1 PVL was measured using real-time polymerase chain reaction (PCR) at baseline and again at another point, either < 12 months, between 12-24 months, or > 24 months. RESULTS: HAM/TSP... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asymptomatic; Evolution; HTLV-1; Proviral load; HAM/TSP. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702012000400008 |
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| TORO,G. CECILIA. |
| In higher eukaryotes, the nuclear DNA is organized for transcription, replication and mitosis in competent chromatin and chromosomes. The basic unit of chromatin is the nucleosome. This entity is formed by 168 base pairs of DNA wound around an octamer of histones, this octamer of histones consist of two copies of H2A, H2B, H3 and H4. The DNA is sealed in its input and output point by a histone linker: histone H1. Histones were supposed to be very conserved proteins. However, during the past few years it was found that these proteins present a high degree of divergency in several lower eukaryotes. In Trypanosoma, it was found that histones H3 and H4, which are at the center of the nucleosomal organization, showed more than 30 % of divergency, while histone... |
| Tipo: Journal article |
Palavras-chave: Histones; Evolution. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000020 |
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| Damsgaard, Christian; Baliga, Vikram B.; Bates, Eric; Burggren, Warren; Mckenzie, David; Taylor, Edwin; Wright, Patricia A.. |
| Air‐breathing and amphibious fishes are essential study organisms to shed insight into the required physiological shifts that supported the full transition from aquatic water‐breathing fishes to terrestrial air‐breathing tetrapods. While the origin of air‐breathing in the evolutionary history of the tetrapods has received considerable focus, much less is known about the evolutionary physiology of air‐breathing among fishes. This review summarises recent advances within the field with specific emphasis on the cardiorespiratory regulation associated with air‐breathing and terrestrial excursions, and how respiratory physiology of these living transitional forms are affected by development and personality. Finally, we provide a detailed and re‐evaluated model... |
| Tipo: Text |
Palavras-chave: Development; Evolution; Phenotypic plasticity; Terrestrialization; Water-to-air transition. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00588/70029/67946.pdf |
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| Registros recuperados: 176 | |
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