285 research outputs found
BD2I : Normes sur l'identification de 274 images d'objets et leur mise en relation chez l'enfant français de 3 à 8 ans
The data base BD2I provides the first French norms for children of 274 pictures of objects (150 from Snodgarss and Vanderwart, 1980). Correct picture identification and naming, and identification of taxonomic and thematic associations were evaluated between 3 and 8 years. Verbal justification and strength of the associations were assessed between 4 and 8 years. All norms were collected from 80 children by age. Visual similarity was judged by 40 adults. These normative data are necessary because children are less efficient than adults in naming and also because their representations of objects relations differ from those of adults
Weed flora in rice areas under distinct cropping systems, herbicide and irrigation managements
We aimed to evaluate the incidence of weeds in the pre-planting of the summer crop as a function of planting system, herbicide use and irrigation management. The experiment was installed in field conditions, in RBD and 3 x 2 factorial scheme with eight replications. Treatments consisted in submitting rice to three management factors: water management â continuously flooded or intermittend irrigation (Factor A), coupled to the application (traditional control) or not (semi-ecological system) of herbicides (Factor B), and planting system â conventional soil tillage, minimum tillage and no till systems (Factor C). One year after rice cultivation, preceding the planting of the next cropping season, phytosociological evaluations of the weed communities were carried out. We assessed the overall infestation and weed species composition, which were classified by their respective density, frequency and dominance. We also estimated the diversity coefficients of Simpson and Shannon Weiner, and the sustainability coefficient of Shannon; treatments were also grouped by similarity in weed composition. In flood-irrigated rice, no till provides the lowest levels of weed infestation and, together with the conventional cropping system, results in values closer to the ecological sustainability; The application of herbicides in flooded rice crops reduces weed infestation, increases diversity and equalizes the ecological sustainability, compared to areas without the application of weed management methods. However, chemical control leads to the selection of resistant or tolerant species to herbicides, such as Polypogon sp.; Both continuous and intermittent water management systems did not cause changes in the level of infestation, composition or diversity coefficients
Incidence, scaling relations and physical conditions of ionized gas outflows in MaNGA
In this work, we investigate the strength and impact of ionised gas outflows
within MaNGA galaxies. We find evidence for outflows in 322
galaxies ( of the analysed line-emitting sample), 185 of which show
evidence for AGN activity. Most outflows are centrally concentrated with a
spatial extent that scales sublinearly with . The incidence of
outflows is enhanced at higher masses, central surface densities and deeper
gravitational potentials, as well as at higher SFR and AGN luminosity. We
quantify strong correlations between mass outflow rates and the mechanical
drivers of the outflow of the form
and . We derive a master scaling
relation describing the mass outflow rate of ionised gas as a function of
, SFR, and . Most of the observed winds are
anticipated to act as galactic fountains, with the fraction of galaxies with
escaping winds increasing with decreasing potential well depth. We further
investigate the physical properties of the outflowing gas finding evidence for
enhanced attenuation in the outflow, possibly due to metal-enriched winds, and
higher excitation compared to the gas in the galactic disk. Given that the
majority of previous studies have focused on more extreme systems with higher
SFRs and/or more luminous AGN, our study provides a unique view of the
non-gravitational gaseous motions within `typical' galaxies in the low-redshift
Universe, where low-luminosity AGN and star formation contribute jointly to the
observed outflow phenomenology.Comment: Accepted for publication in MNRAS, 27 pages, Fig 7 & 8 for scaling
wind strength with drivers, Fig 10 for master scalin
Cool outflows in MaNGA:a systematic study and comparison to the warm phase
This paper investigates the neutral gas phase of galactic winds via the Na I
D{\AA} feature within MaNGA galaxies,
and directly compares their incidence and strength to the ionized winds
detected within the same parent sample. We find evidence for neutral outflows
in 127 galaxies ( per cent of the analysed line-emitting sample). Na I
D winds are preferentially seen in galaxies with dustier central regions and
both wind phases are more often found in systems with elevated SFR surface
densities, especially when there has been a recent upturn in the star formation
activity according to the SFR/SFR parameter. We find the
ionized outflow kinematics to be in line with what we measure in the neutral
phase. This demonstrates that, despite their small contributions to the total
outflow mass budget, there is value to collecting empirical measurements of the
ionized wind phase to provide information on the bulk motion in the outflow.
Depending on dust corrections applied to the ionized gas diagnostics, the
neutral phase has dex higher mass outflow rates
(), on average, compared to the ionized phase. We quantify
scaling relations between and the strengths of the physical
wind drivers (SFR, ). Using a radial-azimuthal stacking method, and by
considering inclination dependencies, we find results consistent with biconical
outflows orthogonal to the disk plane. Our work complements other multi-phase
outflow studies in the literature which consider smaller samples, more extreme
objects, or proceed via stacking of larger samples.Comment: This is a pre-copyedited, author-produced PDF of an article accepted
for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)
following peer revie
O TRABALHO PEDAGĂGICO SOBRE A TEMĂTICA âDIFERENĂASâ NO ENSINO FUNDAMENTAL: A EXPERIĂNCIA DAS RODAS DE CONVERSA
Neste artigo buscamos socializar uma atividade de ensino denominada ârodas de conversa sobre diferençasâ, desenvolvida no ano de 2019 com turmas de 2Âș ano do Ensino Fundamental do ColĂ©gio de Aplicação da Universidade Federal de Santa Catarina. Tal atividade foi criada a partir de uma necessidade que sentĂamos de pensar em formas de abordar didĂĄtica e pedagogicamente a questĂŁo das âdiferençasâ com as crianças em sala de aula, para alĂ©m de um discurso social e politicamente correto de que precisamos âincluirâ e respeitar as âdiferençasâ. A partir dessa demanda, buscamos coletivamente planejar açÔes que envolvessem as crianças e, sobretudo, mobilizassem a reflexĂŁo e oportunizassem a fala, pois, compreendĂamos que esse assunto merecia uma abordagem que nĂŁo fosse didatizada ou sistematizada de forma clĂĄssica, como ocorre com certos conteĂșdos escolares. Nesse sentido, elaboramos uma metodologia em que selecionĂĄvamos um disparador ou mobilizador da conversa, um artefato cultural dirigido ao pĂșblico infantil, que pudesse sensibilizar as crianças e engajĂĄ-las no diĂĄlogo conosco. Consideramos que a estratĂ©gia adotada cumpriu seu papel, pois observamos o entusiasmo e seriedade das crianças nas conversas, bem como o desenvolvimento de reflexĂ”es que possibilitaram a mudança de posturas, falas e comportamentos excludentes. Ademais, as rodas forneceram as professoras elementos para repensar a prĂĄtica pedagĂłgica de modo que todos fossem contemplados
The RNA Binding Protein Quaking Regulates Formation of circRNAs
SummaryCircular RNAs (circRNAs), formed by non-sequential back-splicing of pre-mRNA transcripts, are a widespread form of non-coding RNA in animal cells. However, it is unclear whether the majority of circRNAs represent splicing by-products without function or are produced in a regulated manner to carry out specific cellular functions. We show that hundreds of circRNAs are regulated during human epithelial-mesenchymal transition (EMT) and find that the production of over one-third of abundant circRNAs is dynamically regulated by the alternative splicing factor, Quaking (QKI), which itself is regulated during EMT. Furthermore, by modulating QKI levels, we show the effect on circRNA abundance is dependent on intronic QKI binding motifs. Critically, the addition of QKI motifs is sufficient to induce de novo circRNA formation from transcripts that are normally linearly spliced. These findings demonstrate circRNAs are both purposefully synthesized and regulated by cell-type specific mechanisms, suggesting they play specific biological roles in EMT
- âŠ