Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 7
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Cytochemical study of Rhodnius neglectus and Rhodnius prolixus salivary gland cells (Hemiptera, Triatominae) Iheringia, Sér. Zool.
Anhê,Ana C. B. M.; Lima-Oliveira,Ana P. M.; Azeredo-Oliveira,Maria T. V..
Triatomines are hematophagous bugs of medical interest in South and Central America, where they may act as invertebrate hosts of the hemoflagellate protozoa Trypanosoma cruzi (the causative of Chagas’ disease) and Trypanosoma rangeli (Tejera, 1920). Triatomines of Rhodnius genus have salivary gland formed by two close and independent units: the principal and the accessory. This gland secretes saliva that abounds in substances that facilitate and permit feeding. Despite this importance, there are few reports on its cytochemistry. In purpose of amplifying this understanding, in this work it was investigated the nuclear structures (chromatin and nucleolar corpuscles) of salivary gland cells of Rhodnius neglectus (Lent, 1954) and Rhodnius prolixus (Stål,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gland; Morphology; Chromatin; Nucleolus; Nucleus.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000400002
Imagem não selecionada

Imprime registro no formato completo
Does the chromosomal position of 35S rDNA sites influence their transcription? A survey on Nothoscordum species (Amaryllidaceae) Genet. Mol. Biol.
Báez,Mariana; Souza,Gustavo; Guerra,Marcelo.
Abstract 35S ribosomal DNA (rDNA) sites are the regions where the ribosomal genes 18S, 5.8S and 25S, responsible for the formation of the nucleoli, are found. The fact that rDNA sites have non-random distribution on chromosomes suggests that their positions may influence their transcription. To identify if the preferentially transcribed rDNA sites occupy specific position, six species (nine cytotypes) of the genus Nothoscordum were analyzed using two different techniques to impregnate the nucleolar organizer regions (NORs) with silver nitrate. Both techniques strongly stained NORs, but one of them also stained the proximal region of all chromosomes, suggesting the existence of another group of argentophilic proteins in this region. In species with rDNA...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nucleolus; Ribosomal genes; Preferential activation of NORs; Nothoscordum.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000100305
Imagem não selecionada

Imprime registro no formato completo
Genomic organization of nucleolin gene in carp fish: Evidence for several genes Biol. Res.
QUEZADA,CLAUDIA; NAVARRO,CRISTINA; SAN MARTÍN,RODY; ÁLVAREZ,MARCO; MOLINA,ALFREDO; VERA,M. INÉS.
The protein nucleolin, functionally involved in the main steps of ribosome biogenesis, is codified by a single copy gene in mammals. Here we report that at least three different genes codify for this protein in carp fish (Cyprinus carpio). This is the first description of the genomic organization of nucleolin in a teleost. The carp nucleolin gene includes 8.8 kb and contains 16 exons. Promoter cis regulatory elements are similar to constitutive genes, i.e., a putative TATA box, three G/C boxes, and three pyrimidine-rich boxes. As in other species, carp nucleolin gene introns host three snoRNA codifying sequences: U23 from the H/ACA family and two C/D box snoRNAs, U20 and U82. Both U20 and U82 span a complementary sequence with carp 18S rRNA. Additionally,...
Tipo: Journal article Palavras-chave: Nucleolin; Nucleolus; U snoRNAs; RRNA 18S; Carp fish.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200017
Imagem não selecionada

Imprime registro no formato completo
Mg 2+ -dependent ATPase activity in triatomine salivary glands (Heteroptera, Triatominae) Iheringia, Sér. Zool.
Anhê,Ana C. B. M.; Azeredo-Oliveira,Maria T. V..
ABSTRACT Mg2+-ATPase activity was detected in the three salivary glands of adult triatomines, males and females, of Triatoma infestans (Klug, 1834) and Panstrongylus megistus (Burmeister, 1835) (Heteroptera, Triatominae). A predominance of binucleated cells in D1 and D2 and mononucleated in D3 was observed, with bulky and polyploidy nuclei. ATPase activity was detected in the nuclei, possibly in euchromatin and nucleolus, where this enzyme probably acts in the transcription process. ATPase reaction was also evidenced in the nuclear membrane, which is probably associated with nuclear-cytoplasmatic transport. These characteristics indicate a high metabolism and protein synthesis, which must be essential to saliva production as well as in maintaining the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Euchromatin; Gland; Nuclear membrane; Nucleolus; Phosphatase.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100231
Imagem não selecionada

Imprime registro no formato completo
Spermatogenesis and nucleolar activity in Triatoma klugi (triatomine, Heteroptera) Genet. Mol. Biol.
Costa,Laiana Cristina da; Azeredo-Oliveira,Maria Tercília Vilela de; Tartarotti,Ester.
Triatoma klugi is a Chagas disease vector in the Rio Grande do Sul State. Triatominae chromosomes are holocentric and sex chromosomes segregation is post-reductional. In this paper we describe the karyotype of male T. klugi and a meiotic analysis including the nucleolar behavior during spermatogenesis. Testis cells were analyzed after lacto-acetic orcein and silver nitrate staining. Two autosomes and the heterochromosomes presented nucleolar activity (Ag-NORs) during diplotene-diakinesis. The analysis of metaphase I and II revealed a karyotype with 2n = 20+XY. In metaphase I a prominent nucleolar mass was observed in the cell periphery and small silver grains were detected in metaphase II. During anaphase, the chromosomes segregated in parallel and a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Triatoma klugi; Triatomine; Cytogenetics; Nucleolus; Karyotype; Meiosis.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300008
Imagem não selecionada

Imprime registro no formato completo
The nucleolus: a paradigm for cell proliferation and aging BJMBR
Comai,L..
The nucleolus is the cellular site of ribosome biosynthesis. At this site, active ribosomal DNA (rDNA) genes are rapidly transcribed by RNA polymerase I (pol I) molecules. Recent advances in our understanding of the pol I transcription system have indicated that regulation of ribosomal RNA (rRNA) synthesis is a critical factor in cell growth. Importantly, the same signaling networks that control cell growth and proliferation and are deregulated in cancer appear to control pol I transcription. Therefore, the study of the biochemical basis for growth regulation of pol I transcription can provide basic information about the nuclear signaling network. Hopefully, this information may facilitate the search for drugs that can inhibit the growth of tumor cells by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nucleolus; RNA pol I; Aging; Transcription; Werner syndrome.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001200004
Imagem não selecionada

Imprime registro no formato completo
TO NEGOTIATE OR TO GAME THEORIZE: Negotiation vs. Game Theory Outcomes for Water Allocation Problems in the Kat Basin, South Africa AgEcon
Dinar, Ariel; Farolfi, Stefano; Patrone, Fioravante; Rowntree, Kate.
The 6th MEETING ON GAME THEORY AND PRACTICE Zaragoza, Spain 10-12 July 2006
Tipo: Working or Discussion Paper Palavras-chave: Negotiation; Role-playing game; Core; Nucleolus; Shapley value; Water allocation; Economic efficiency; Planning models; Resource /Energy Economics and Policy; C61; C71; C78; Q25; Q56; R14.
Ano: 2006 URL: http://purl.umn.edu/60888
Registros recuperados: 7
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional