In TV series Devs, a tech company has built an extremely powerful quantum computer. The show is both beautiful and captivating, says Rowan Hooper

Once the coronavirus pandemic is over, we must work out how to stop the spread of poor information that has helped make a bad situation that much worse

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Members of the flavivirus genus share a high level of sequence similarity and often circulate in the same geographical regions. However, whether T cells induced by one viral species cross-react with other related flaviviruses has not been globally addressed. In this study, we tested pools of epitopes derived from dengue (DENV), Zika (ZIKV), Japanese encephalitis (JEV), West Nile (WNV), and yellow fever (YFV) viruses by intracellular cytokine staining (ICS) using peripheral blood mononuclear cells (PBMCs) of individuals naturally exposed to DENV or immunized with DENV (TV005) or YF17D vaccine. CD8 T cell responses recognized epitopes from multiple flaviviruses; however, the magnitude of cross-reactive responses was consistently severalfold lower than those to the autologous epitope pools and was associated with lower expression of activation markers such as CD40L, CD69, and CD137. Next, we characterized the antigen sensitivity of short-term T cell lines (TCL) representing 29 different individual epitope/donor combinations. TCL derived from DENV monovalent vaccinees induced CD8 and CD4 T cells that cross-reacted within the DENV serocomplex but were consistently associated with >100-fold-lower antigen sensitivity for most other flaviviruses, with no cross-recognition of YFV-derived peptides. CD8 and CD4 TCL from YF17D vaccinees were associated with very limited cross-reactivity with any other flaviviruses and in five out of eight cases >1,000-fold-lower antigen sensitivity. Overall, our data suggest limited cross-reactivity for both CD4 and CD8 T cell responses between flaviviruses and have implications for understanding immunity elicited by natural infection and strategies to develop live attenuated vaccines against flaviviral species.

IMPORTANCE The envelope (E) protein is the dominant target of neutralizing antibodies for dengue virus (DENV) and yellow fever virus (YFV). Accordingly, several DENV vaccine constructs use the E protein in a live attenuated vaccine format, utilizing a backbone derived from a heterologous flavivirus (such as YF) as a delivery vector. This backbone comprises the nonstructural (NS) and capsid (C) antigens, which are dominant targets of T cell responses. Here, we demonstrate that cross-reactivity at the level of T cell responses among different flaviviruses is very limited, despite high levels of sequence homology. Thus, the use of heterologous flavivirus species as a live attenuated vaccine vector is not likely to generate optimal T cell responses and might thus impair vaccine performance.

Disorders of oxygen transport are commonly attributed to inadequate carrying capacity (anemia) but may also relate to inefficient gas exchange by red blood cells (RBCs), a process that is poorly characterized yet assumed to be rapid. Without direct measurements of gas exchange at the single-cell level, the barriers to O2...

Zhi-Jun Zhao, Davina Derous, Abby Gerrard, Jing Wen, Xue Liu, Song Tan, Catherine Hambly, and John R. Speakman

Lactating mice increase food intake 4- to 5-fold, reaching an asymptote in late lactation. A key question is whether this asymptote reflects a physiological constraint, or a maternal investment strategy (a ‘restraint’). We exposed lactating mice to periods of food restriction, hypothesizing that if the limit reflected restraint, they would compensate by breaching the asymptote when refeeding. In contrast, if it was a constraint, they would by definition be unable to increase their intake on refeeding days. Using isotope methods, we found that during food restriction, the females shut down milk production, impacting offspring growth. During refeeding, food intake and milk production rose again, but not significantly above unrestricted controls. These data provide strong evidence that asymptotic intake in lactation reflects a physiological/physical constraint, rather than restraint. Because hypothalamic neuropeptide Y (Npy) was upregulated under both states of restriction, this suggests the constraint is not imposed by limits in the capacity to upregulate hunger signalling (the saturated neural capacity hypothesis). Understanding the genetic basis of the constraint will be a key future goal and will provide us additional information on the nature of the constraining factors on reproductive output, and their potential links to life history strategies.

Samantha M. Logan, Kama E. Szereszewski, Nigel C. Bennett, Daniel W. Hart, Barry van Jaarsveld, Matthew E. Pamenter, and Kenneth B. Storey

Mole-rats are champions of self-preservation, with increased longevity compared to other rodents their size, strong antioxidant capabilities, and specialized defenses against endogenous oxidative stress. However, how the brains of these subterranean mammals handle acute in vivo hypoxia is poorly understood. This study is the first to examine the molecular response to low oxygen in six different species of hypoxia-tolerant mole-rats from sub-Saharan Africa. Protein carbonylation, a known marker of DNA damage (hydroxy-2’-deoxyguanosine), and antioxidant capacity did not change following hypoxia but HIF-1 protein levels increased significantly in the brains of two species. Nearly 30 miRNAs known to play roles in hypoxia-tolerance were differentially regulated in a species-specific manner. The miRNAs exhibiting the strongest response to low oxygen stress inhibit apoptosis and regulate neuroinflammation, likely providing neuroprotection. A principal component analysis using a subset of the molecular targets assessed herein revealed differences between control and hypoxic groups for two solitary species (Georychus capensis and Bathyergus suillus), which are ecologically adapted to a normoxic environment, suggesting a heightened sensitivity to hypoxia relative to species that may experience hypoxia more regularly in nature. By contrast, all molecular data were included in the PCA to detect a difference between control and hypoxic populations of eusocial Heterocephalus glaber, indicating they may require many lower-fold changes in signaling pathways to adapt to low oxygen settings. Finally, none of the Cryptomys hottentotus subspecies showed a statistical difference between control and hypoxic groups, presumably due to hypoxia-tolerance derived from environmental pressures associated with a subterranean and social lifestyle.

Biological nitrogen fixation can be an important source of nitrogen in tropical forests that serve as a major CO₂ sink. Extensive deforestation of the Amazon is known to influence microbial communities and the biogeochemical cycles they mediate. However, it is unknown how diazotrophs (nitrogen-fixing microorganisms) respond to deforestation and subsequent ecosystem conversion to agriculture, as well as whether they can recover in secondary forests that are established after agriculture is abandoned. To address these knowledge gaps, we combined a spatially explicit sampling approach with high-throughput sequencing of nifH genes. The main objectives were to assess the functional distance decay relationship of the diazotrophic bacterial community in a tropical forest ecosystem and to quantify the roles of various factors that drive the observed changes in the diazotrophic community structure. We observed an increase in local diazotrophic diversity (α-diversity) with a decrease in community turnover (β-diversity), associated with a shift in diazotrophic community structure as a result of the forest-to-pasture conversion. Both diazotrophic community turnover and structure showed signs of recovery in secondary forests. Changes in the diazotrophic community were primarily driven by the change in land use rather than differences in geochemical characteristics or geographic distances. The diazotroph communities in secondary forests resembled those in primary forests, suggesting that at least partial recovery of diazotrophs is possible following agricultural abandonment.

IMPORTANCE The Amazon region is a major tropical forest region that is being deforested at an alarming rate to create space for cattle ranching and agriculture. Diazotrophs (nitrogen-fixing microorganisms) play an important role in supplying soil N for plant growth in tropical forests. It is unknown how diazotrophs respond to deforestation and whether they can recover in secondary forests that establish after agriculture is abandoned. Using high-throughput sequencing of nifH genes, we characterized the response of diazotrophs’ β-diversity and identified major drivers of changes in diazotrophs from forest-to-pasture and pasture-to-secondary-forest conversions. Studying the impact of land use change on diazotrophs is important for a better understanding of the impact of deforestation on tropical forest ecosystem functioning, and our results on the potential recovery of diazotrophs in secondary forests imply the possible restoration of ecosystem functions in secondary forests.

BACKGROUND AND PURPOSE:

Diffuse intrinsic pontine glioma is a lethal childhood brain cancer with dismal prognosis and MR imaging is the primary methodology used for diagnosis and monitoring. Our aim was to determine whether advanced diffusion, perfusion, and permeability MR imaging metrics predict survival and pseudoprogression in children with newly diagnosed diffuse intrinsic pontine glioma.

There are some signs that can help you determine whether you are paying too much for the house you want to buy.

If you're 13 to 24 years old and love to make movies, you'll want to enter the Windsor Youth Short Film Showcase next week. Organizer Gemma Eva says the project is meant to spotlight local "Gen-Z filmmakers."

A person who has ingested cocaine will excrete a compound that can be detected from a single fingerprint, even if they have washed their hands

In TV series Devs, a tech company has built an extremely powerful quantum computer. The show is both beautiful and captivating, says Rowan Hooper

These findings suggest that scientists may need to broaden their definition of what a life-supporting planet might look like.

Scientists are speculating as to how the two creatures managed to become preserved in such an unusual way.

The Quadrantid meteor shower has a short peak period that lasts only a few hours, so midnight on 3 January is the best time to view in the UK

Your weekly selection of awesome robot videos

Ubisoft debuted some in-engine footage of the latest Assassin's Creed game during the Inside Xbox stream

Anna Marie proves she’s insane and tries to get Chris to start up a human breeding program to boot. We hear from people about the...

Waters lap perilously close to audience as grand capes and latex trench coats are modelled

How to make the fashion industry engage with the climate crisis? Flood the venue, and submerge the front row.

Arriving at the Balenciaga show in Paris on Sunday morning, the audience found themselves entering at the periphery of what looked like a sports stadium, with banks of flip-up plastic seats around a central oval. In pitch blackness, it was hard to tell exactly, but attendants were on hand with torches, and strict instructions not to proceed beyond the third row.

A world-first study has demonstrated significant benefits to a premature baby's heart and brain function when held by the parent in skin-to-skin contact. Parent-infant skin-to-skin care (SSC) or kangaroo care, started in the late 1970s in Columbia when incubators to keep babies warm were not available. It is now widely recognized as a beneficial component of holistic care provided for pre-term infants.

A team of researchers from the University of Exeter has studied potential drivers of ‘rock juggling’ in two species of otters in zoo environments. Although elusive in the wild, otters are noted to be very playful and inquisitive animals based on observations in captivity. The animals are often seen lying on their backs and batting [...]

With conferences canceled indefinitely, companies are increasingly reliant on online events to hype product launches. As they prepare to release a next-gen console before the end of the year, expect plenty of live streams and blogs from both Microsoft and Sony in an attempt to flesh out all that their respective systems have to offer. […]

Rahul Gandhi seems to have descended into a spiral of far Left, subversive standpoint since Narendra Modi swept to power at the Centre and the Congress started losing state after state.

A blood test developed and checked using blood samples from 4000 people can accurately detect more than 50 cancer types

Once the coronavirus pandemic is over, we must work out how to stop the spread of poor information that has helped make a bad situation that much worse

“Hi, I’m Taylor.” With that greeting, Taylor Swift returned to the stage as the headliner of “DirectTV Now Super Saturday Night” at Club Nomadic on the eve of the Super Bowl.

All 13 games from third-party developers coming to Xbox Series X.

Miley Cyrus doesn't get a reply from all the celebrities she messages.

Soundgarden have claimed Chris Cornell's widow used charity money for personal purposes.