83 research outputs found
Diversifying Spatial-Temporal Perception for Video Domain Generalization
Video domain generalization aims to learn generalizable video classification
models for unseen target domains by training in a source domain. A critical
challenge of video domain generalization is to defend against the heavy
reliance on domain-specific cues extracted from the source domain when
recognizing target videos. To this end, we propose to perceive diverse
spatial-temporal cues in videos, aiming to discover potential domain-invariant
cues in addition to domain-specific cues. We contribute a novel model named
Spatial-Temporal Diversification Network (STDN), which improves the diversity
from both space and time dimensions of video data. First, our STDN proposes to
discover various types of spatial cues within individual frames by spatial
grouping. Then, our STDN proposes to explicitly model spatial-temporal
dependencies between video contents at multiple space-time scales by
spatial-temporal relation modeling. Extensive experiments on three benchmarks
of different types demonstrate the effectiveness and versatility of our
approach.Comment: Accepted to NeurIPS 2023. Code is available at
https://github.com/KunyuLin/STDN
Photometric Metallicity Calibration with SDSS and SCUSS and its Application to distant stars in the South Galactic Cap
Based on SDSS g, r and SCUSS (South Galactic Cap of u-band Sky Survey)
photometry, we develop a photometric calibration for estimating the stellar
metallicity from and colors by using the SDSS spectra of 32,542 F-
and G-type main sequence stars, which cover almost deg in the
south Galactic cap. The rms scatter of the photometric metallicity residuals
relative to spectrum-based metallicity is dex when , and
dex when . Due to the deeper and more accurate magnitude of SCUSS
band, the estimate can be used up to the faint magnitude of . This
application range of photometric metallicity calibration is wide enough so that
it can be used to study metallicity distribution of distant stars. In this
study, we select the Sagittarius (Sgr) stream and its neighboring field halo
stars in south Galactic cap to study their metallicity distribution. We find
that the Sgr stream at the cylindrical Galactocentric coordinate of
kpc, kpc exhibits a relative rich metallicity
distribution, and the neighboring field halo stars in our studied fields can be
modeled by two-Gaussian model, with peaks respectively at [Fe/H] and
[Fe/H].Comment: 8 pages, 7 figures, Accepted for publication in MNRA
hUbiquitome: a database of experimentally verified ubiquitination cascades in humans
Protein ubiquitination is an evolutionarily conserved and functionally diverse post-translational modification achieved through the sequential action of E1-activating enzymes, E2-conjugating enzymes and E3 ligases. A summary of validated ubiquitination substrates have been presented and a prediction of new substrates have been conducted in yeast. However, a systematic summary of human ubiquitination substrates containing experimental evidence and the enzymatic cascade of each substrate is not available. In the present study, hUbiquitome web resource is introduced, a public resource for the retrieval of experimentally verified human ubiquitination enzymes and substrates. hUbiquitome is the first comprehensive database of human ubiquitination cascades. Currently, hUbiquitome has in its repertoire curated data comprising 1 E1 enzyme, 12 E2 enzymes, 138 E3 ligases or complexes, 279 different substrate proteins and 17 deubiquitination enzyme terms. The biological functions of substrates from different kinds of E3s were analyzed using the collected data. The findings show that substrates ubiquitinated by RING (Really Interesting New Gene) E3s are enriched most in apoptosis-related processes, whereas substrates ubiquitinated by other E3s are enriched in gene expression-associated processes. An analysis of the data demonstrates the biological process preferences of the different kinds of E3s. hUbiquitome is the first database to systematically collect experimentally validated ubiquitinated proteins and related ubiquitination cascade enzymes which might be helpful in the field of ubiquitination-modification research
Mink is a highly susceptible host species to circulating human and avian influenza viruses
Pandemic influenza, typically caused by reassortment of human and avian influenza viruses, can result in severe or fatal infections in humans. Timely identification of potential pandemic viruses must be a priority in influenza virus surveillance. However, the range of host species responsible for the generation of novel pandemic influenza viruses remain unclear. In this study, we conducted serological surveys for avian and human influenza virus infections in farmed mink and determined the susceptibility of mink to prevailing avian and human virus subtypes. The results showed that farmed mink were commonly infected with human (H3N2 and H1N1/pdm) and avian (H7N9, H5N6, and H9N2) influenza A viruses. Correlational analysis indicated that transmission of human influenza viruses occurred from humans to mink, and that feed source was a probable route of avian influenza virus transmission to farmed mink. Animal experiments showed that mink were susceptible and permissive to circulating avian and human influenza viruses, and that human influenza viruses (H3N2 and H1N1/pdm), but not avian viruses, were capable of aerosol transmission among mink. These results indicate that farmed mink could be highly permissive “mixing vessels” for the reassortment of circulating human and avian influenza viruses. Therefore, to reduce the risk of emergence of novel pandemic viruses, feeding mink with raw poultry by-products should not be permitted, and epidemiological surveillance of influenza viruses in mink farms should be urgently implemented
Reassortment with Dominant Chicken H9N2 Influenza Virus Contributed to the Fifth H7N9 Virus Human Epidemic
Abstracts of presentations on plant protection issues at the xth international congress of virology: August 11-16, 1996 Binyanei haOoma, Jerusalem Iarael part 3(final part)
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