1,721,253 research outputs found
A caccia di zanzare... inseguendo il loro DNA
No full textLa ricerca di tracce di DNA ambientale come nuovo strumento per evidenziare specie invasiv
Alla ricerca della natura incontaminata
No full textPubblicato in italiano da Iperborea “L’arte della fuga”, il terzo volume della trilogia di Fredrik Sjoberg, entomologo e giornalista svedese divenuto noto ai lettori italiani con il suo primo volume “L’arte di collezionare mosche
L’uomo come superorganismo
No full textUn organismo è quindi un complesso coordinato e individualizzato di attività che sono primariamente dirette ad ottenere ed assimilare sostanze dall’ambiente per produrre altri sistemi simili (la prole) e proteggere il sistema stesso da eventuali alterazioni dovute all’ambiente
Mariner-like transposable elements are interspersed within the rDNA-associated heterochromatin of the pufferfish Tetraodon fluviatilis (Osteichthyes)
No full textmariner-like elements, puffer®sh, rDNA genes, transposo
A new synthesis in epigenetics: towards an unified function of DNA methylation from invertebrates to vertebrates
No full textDNA methylation is generally limited to CpG doublets located at gene promoter with an involvement in gene silencing. Surprisingly, two recent papers showed an extensive methylation affecting coding portions of transcriptionally active genes in human and plants prompting a rethink of DNA methylation in eukaryotes. Actually, gene body methylation is not surprising since it was repeatedly reported in invertebrates, where it interferes with transcriptional elongation preventing aberrant transcription initiations. As a whole, data published suggest that the most ancestral function of DNA methylation is the control of genes that are susceptible to transcriptional interference and not to gene silencing. The recruitment of DNA methylation for silencing represents a successive tinkered use. In view of this additional function, invertebrate-vertebrates transition has been accompanied by new constrains on DNA methylation that resulted in the strong conservation of the DNA methylation machinery in vertebrates and in the non-viability of mutants lacking DNA methylation
I migratori pigri vivono più a lungo
No full textI rischi connessi alle migrazioni (in particolare legati agli impatti con gli elettrodotti) hanno portato alla selezione di migratori “pigri” per cui nelle popolazioni della grande otarda sono sempre più numerosi gli individui sedentari rispetto ai migrator
Animali (con genomi) fantastici
No full textPubblicato sulla rivista Nature il genoma del cavalluccio marino. Ha perso la pinna caudale e i denti e incuba le uova anche se maschio, il progetto genoma del cavalluccio cerca di fare luce su quei pesci così unic
Identification and chromosomal localization of mariner-like elements in the cabbage moth Mamestra brassicae (Lepidoptera)
No full textA complete mariner-like element has been identified in the lepidopteran Mamestra brassicae. This element, called Mbmar, represents a new type of mariner transposon. It has a transposase similar to that of other insect mariner coding sequences but its inverted terminal repeats differ from typical mariner ones. This observation is unique since generally both mariner coding region and ITRs are evolutionarily conserved in insects. Mbmar is detectable by FISH only in the heterochromatic regions of both the sex chromosomes
- …
