Undercurrents: The Oversight Board's Trump decision, and Merkel's legacy Audio bhorton.drupal 25 June 2021

Was Facebook right to suspend Trump? And how will Merkel be remembered?

In the wake of the storming of Capitol Hill on 6 January 2021, social media platforms took steps to remove former President Donald Trump from their websites for infringing community standards. This step was welcomed by many, but also raised serious questions about the power of social media companies to limit free speech and censor elected officials. The suspension of President Trump from Facebook was referred to the Oversight Board, an independent body of experts set up to scrutinise the platform’s content moderation decisions.  

In this episode, Ben speaks to Thomas Hughes and Kate Jones about the outcome of the Oversight Board’s inquiry into the Trump suspension, and the wider implications for content moderation on social media.  

Then Lara is joined by Hans Kundnani to assess the political outlook in Germany and reflect on the legacy of outgoing Chancellor Angela Merkel.  

Jian Li
Proc. Amer. Math. Soc. 152 (), 5207-5217.
Abstract, references and article information

Chorismate mutase (CM), an essential enzyme at the branch-point of the shikimate pathway, is required for the biosynthesis of phenylalanine and tyrosine in bacteria, archaea, plants, and fungi. MtCM, the CM from Mycobacterium tuberculosis, has less than 1% of the catalytic efficiency of a typical natural CM and requires complex formation with 3-deoxy-d-arabino-heptulosonate 7-phosphate synthase for high activity. To explore the full potential of MtCM for catalyzing its native reaction, we applied diverse iterative cycles of mutagenesis and selection, thereby raising kcat/Km 270-fold to 5 × 105 m−1s−1, which is even higher than for the complex. Moreover, the evolutionarily optimized autonomous MtCM, which had 11 of its 90 amino acids exchanged, was stabilized compared with its progenitor, as indicated by a 9 °C increase in melting temperature. The 1.5 Å crystal structure of the top-evolved MtCM variant reveals the molecular underpinnings of this activity boost. Some acquired residues (e.g. Pro52 and Asp55) are conserved in naturally efficient CMs, but most of them lie beyond the active site. Our evolutionary trajectories reached a plateau at the level of the best natural enzymes, suggesting that we have exhausted the potential of MtCM. Taken together, these findings show that the scaffold of MtCM, which naturally evolved for mediocrity to enable inter-enzyme allosteric regulation of the shikimate pathway, is inherently capable of high activity.

How is the war in Ukraine affecting perceptions of Russia in Africa? Explainer Video NCapeling 10 June 2022

Aanu Adeoye outlines how the invasion of Ukraine is affecting perceptions of Russia across the Africa region.

He says the voting patterns at the United Nations (UN) shows that the majority of African countries are unhappy about Russia’s actions, but there is not a united voice as there is in the European Union (EU) and North America.

Certain countries are heavily influenced by historical ties with Russia going back to the Soviet era and their own struggles for liberation, while others tend to remain non-aligned whenever possible.

Tuberculosis (TB), caused by the infection of Mycobacterium tuberculosis (MTB), is one of the leading causes of death worldwide, especially in children. However, the mechanisms by which MTB infects its cellular host, activates an immune response, and triggers inflammation remain unknown. Mitochondria play important roles in the initiation and activation of the nucleotide-binding oligomerization domain-like receptor with a pyrin domain 3 (NLRP3) inflammasome, where mitochondria-associated endoplasmic reticulum membranes (MAMs) may serve as the platform for inflammasome assembly and activation. Additionally, mitofusin 2 (MFN2) is implicated in the formation of MAMs, but, the roles of mitochondria and MFN2 in MTB infection have not been elucidated. Using mircroarry profiling of TB patients and in vitro MTB stimulation of macrophages, we observed an up-regulation of MFN2 in the peripheral blood mononuclear cells of active TB patients. Furthermore, we found that MTB stimulation by MTB-specific antigen ESAT-6 or lysate of MTB promoted MFN2 interaction with NLRP3 inflammasomes, resulting in the assembly and activation of the inflammasome and, subsequently, IL-1β secretion. These findings suggest that MFN2 and mitochondria play important role in the pathogen-host interaction during MTB infection.

Natalie Bruiners
Dec 1, 2020; 61:1617-1628
Research Articles

The rise of drug-resistant tuberculosis poses a major risk to public health. Statins, which inhibit both cholesterol biosynthesis and protein prenylation branches of the mevalonate pathway, increase anti-tubercular antibiotic efficacy in animal models. However, the underlying molecular mechanisms are unknown. In this study, we used an in vitro macrophage infection model to investigate simvastatin’s anti-tubercular activity by systematically inhibiting each branch of the mevalonate pathway and evaluating the effects of the branch-specific inhibitors on mycobacterial growth. The anti-tubercular activity of simvastatin used at clinically relevant doses specifically targeted the cholesterol biosynthetic branch rather than the prenylation branches of the mevalonate pathway. Using Western blot analysis and AMP/ATP measurements, we found that simvastatin treatment blocked activation of mechanistic target of rapamycin complex 1 (mTORC1), activated AMP-activated protein kinase (AMPK) through increased intracellular AMP:ATP ratios, and favored nuclear translocation of transcription factor EB (TFEB). These mechanisms all induce autophagy, which is anti-mycobacterial. The biological effects of simvastatin on the AMPK-mTORC1-TFEB-autophagy axis were reversed by adding exogenous cholesterol to the cells. Our data demonstrate that the anti-tubercular activity of simvastatin requires inhibiting cholesterol biosynthesis, reveal novel links between cholesterol homeostasis, the AMPK-mTORC1-TFEB axis, and Mycobacterium tuberculosis infection control, and uncover new anti-tubercular therapy targets.

The neuronal basis of complex social behavior is still poorly understood. In honeybees, reproductive investment decisions are made at the colony-level. Queens develop from female-destined larvae that receive alloparental care from nurse bees in the form of ad-libitum royal jelly (RJ) secretions. Typically, the number of raised new queens is limited but genetic breeding of "royal jelly bees" (RJBs) for enhanced RJ production over decades has led to a dramatic increase of reproductive investment in queens. Here, we compare RJBs to unselected Italian bees (ITBs) to investigate how their cognitive processing of larval signals in the mushroom bodies (MBs) and antennal lobes (ALs) may contribute to their behavioral differences. A cross-fostering experiment confirms that the RJB syndrome is mainly due to a shift in nurse bee alloparental care behavior. Using olfactory conditioning of the proboscis extension reflex, we show that the RJB nurses spontaneously respond more often to larval odors compared with ITB nurses but their subsequent learning occurs at similar rates. These phenotypic findings are corroborated by our demonstration that the proteome of the brain, particularly of the ALs differs between RJBs and ITBs. Notably, in the ALs of RJB newly emerged bees and nurses compared with ITBs, processes of energy and nutrient metabolism, signal transduction are up-regulated, priming the ALs for receiving and processing the brood signals from the antennae. Moreover, highly abundant major royal jelly proteins and hexamerins in RJBs compared with ITBs during early life when the nervous system still develops suggest crucial new neurobiological roles for these well-characterized proteins. Altogether, our findings reveal that RJBs have evolved a strong olfactory response to larvae, enabled by numerous neurophysiological adaptations that increase the nurse bees' alloparental care behavior.

The increasing consumption of high-fat foods combined with a lack of exercise is a major contributor to the burden of obesity in humans. Aerobic exercise such as running is known to provide metabolic benefits, but how the over-consumption of a high fat diet (HFD) and exercise interact is not well characterized at the molecular level. Here, we examined the plasma proteome in mice for the effects of aerobic exercise as both a treatment and as a preventative regime for animals on either HFD or a healthy control diet. This analysis detected large changes in the plasma proteome induced by the HFD, such as increased abundance of SERPINA7, ALDOB, and down-regulation of SERPINA1E, CFD (adipsin). Some of these changes were significantly reverted using exercise as a preventative measure, but not as a treatment regime. To determine if either the intensity, or duration, of exercise influenced the outcome, we compared high-intensity interval training (HIIT) and endurance running. Endurance running slightly out-performed HIIT exercise, but overall, both provided similar reversion in abundance of plasma proteins modulated by the high-fat diet including SERPINA7, APOE, SERPINA1E, and CFD. Finally, we compared the changes induced by over-consumption of HFD to previous data from mice fed an isocaloric high saturated fat (SFA) or polyunsaturated fat (PUFA) diet. This identified several common changes including increased APOC2 and APOE, but also highlighted changes specific for either over-consumption of HFD (ALDOB, SERPINA7, CFD), SFA-based diets (SERPINA1E), or PUFA-based diets (Haptoglobin - Hp). Together, these data highlight the importance of early intervention with exercise to revert HFD-induced phenotypes and suggest some of the molecular mechanisms leading to the changes in the plasma proteome generated by high fat diet consumption. Web-based interactive visualizations are provided for this dataset (larancelab.com/hfd-exercise), which give insight into diet and exercise phenotypic interactions on the plasma proteome.

Exploring Transatlantic Responses to Far-right Populism in Europe: Simulation Exercise Research paper sysadmin 1 May 2018

A new paper summarizes the findings of a recent simulation exercise exploring how governments on both sides of the Atlantic might respond to a descent towards populist authoritarianism in an EU member state.

Summary

• To better understand how governments on both sides of the Atlantic might respond to a descent towards populist authoritarianism in an EU member state, Chatham House organized a simulation event involving a group of experts drawn from the public sector, academia and NGOs.
• Simulation exercises enable the testing and modelling of the responses of different actors when presented with specific situations; participants’ interactions in a given set of circumstances are explored, and patterns of negotiation are captured and analysed.
• In this simulation, European, US and multilateral representatives were given the task of managing relations with Baltia, a fictional Eastern European state on the verge of electing a far-right nationalist, Eurosceptic government. They were then challenged to manage their relationship with Baltia after it had elected such a government, which was pushing for a ‘leave’ vote in a planned referendum on the country’s continued EU membership.
• The simulation highlighted a number of issues:
  • Limited instruments are available to liberal democratic governments where there is cause for concern regarding the outcome of an election in an allied country. There are relatively few tools at the disposal of governments to support political allies, or to prevent outcomes that are perceived as threatening democratic norms. The simulation reinforced the view that interventionist moves, either from the European Commission or from individual national governments, would be more likely to come in response to an unfavourable development rather than pre-emptively.
  • The EU, and caucuses of European states, are the main international interlocutors in this type of political crisis involving an EU member state. The US opted to play a limited role in the negotiations; the same was largely true for NATO, aside from its action in sharing intelligence about a potential coup in Baltia. France and Germany formed a natural working partnership, taking meetings together and coordinating policies first before discussing them with a wider European circle, although their positions did not always align.
  • The UK’s capacity to shape the outcome of collective EU discussions appeared more restricted, while Brexit also seemed to shape the response of other EU states to the developing situation in Baltia. Although member states were undoubtedly reluctant to see another country go down this route, they were also resolute in demonstrating a unity of approach and limited flexibility in the face of the new populist government’s attempt to divide them.

Undercurrents: Europe's far-right educational institutions Audio bhorton.drupal 8 October 2021

In Hungary, France and Spain, new political movements from the far-right are attempting to reshape their education systems.

Under the supportive eye of Prime Minister Viktor Orbán, the recently established National University of Public Service seeks to embed nationalist illiberal values in a new generation of Hungarian students. Meanwhile in France and Spain, far-right public figure Marion Maréchal has turned away from the electoral politics of the Front Nationale to set up a new conservative research institute, ISSEP.

Both of these developments represent a challenge to the liberal values which underpin the existing international order. To find out more, Ben spoke with Professor Dorit Geva and Dr Felipe Santos, whose recent article in International Affairs considers the implications of this illiberal educational turn. 

Ukraine's military intelligence has intercepted what it claims are radio communications between North Korean soldiers in Russia, amid media reports of a massive troop buildup ahead of an attack in the Kursk region.

A struggling Detroit Lions offense awoke late, scoring 19-unanswered points to rally past the Houston Texans and improve to 8-1 this season. The Lions overcame a career-high five interceptions Jared Goff threw.

Oct. 29, 2024 — NVIDIA has announced that xAI’s Colossus supercomputer cluster comprising 100,000 NVIDIA Hopper GPUs in Memphis, Tennessee, achieved this massive scale by using the NVIDIA Spectrum-X Ethernet […]

The post NVIDIA Ethernet Networking Accelerates xAI’s Colossus AI Supercomputer appeared first on HPCwire.

Oct. 31, 2024 — Giga Computing, a subsidiary of GIGABYTE and a leader in generative AI servers and advanced cooling technologies, will participate in today’s AI Accelerator Skyscraper Congress, hosted […]

The post GIGABYTE Joins AI Accelerator Skyscraper Congress to Highlight Sustainable Supercomputing Advances appeared first on HPCwire.

We hear a lot about quantum computers – sometimes too much – but not as much about quantum networking which will also be a critical component in making widespread use […]

The post EPB Offers Commercial Quantum Network for Quantum Developers appeared first on HPCwire.

The Rapid Trident 21 exercise to enhance interoperability between Ukraine, U.S. and NATO partners started Monday, with an opening ceremony, and will run through Oct. 1.

A multinational military exercise intended to improve interoperability between the U.S. Army and allied nations wrapped up its final phase in Turkey on Monday.

U.S. fighter jets escorted a small plane flown by a U.S. Army soldier out of restricted air space over New York City during the United Nations General Assembly.

Being a "weekend warrior" -- engaging in exercise once or twice per week -- may be as beneficial as regular sessions in decreasing the risk of cognitive decline that often leads to dementia, a new study concludes.

MILAN, Nov. 6, 2024 — ENEA, Italy’s National Agency for New Technologies, Energy and Sustainable Economic Development, has selected Lenovo for the installation of an HPC system at the Portici […]

The post ENEA Chooses Lenovo for Supercomputer to Accelerate Sustainable Energy Research appeared first on HPCwire.

The fantastic Supercomputing 2024 show is coming back to Atlanta this year. If last year was any indication, there will be plenty of coffee flowing and lots of discussions around […]

The post Top500 Wild Cards Could Add Thrills to Supercomputing 2024 Show appeared first on HPCwire.

Singer and actress Andra Day is joining the Season 2 cast of "Percy Jackson" on Disney+. She will play Greek goddess Athena in the series -- and Annabeth's mother.

Lose weight with no effort using the ripple effect.

Which types of exercise can help keep the brain healthy?

With many school buildings closed for the rest of the academic year—and more to follow—district leaders turn their attention to making up for what may be deep learning losses.

With many school buildings closed for the rest of the academic year—and more to follow—district leaders turn their attention to making up for what may be deep learning losses.

With many school buildings closed for the rest of the academic year—and more to follow—district leaders turn their attention to making up for what may be deep learning losses.

The West Virginia House of Delegates passed its version of a sweeping education omnibus bill, which would allow the state's first charter schools.

William W. Seeley
Dec 11, 2019; 39:9878-9882
Progressions

Kong-Fatt Wong
Jan 25, 2006; 26:1314-1328
BehavioralSystemsCognitive

Recent visual experience heavily influences our visual perception, but how neuronal activity is reshaped to alter and improve perceptual discrimination remains unknown. We recorded from populations of neurons in visual cortical area V4 while two male rhesus macaque monkeys performed a natural image change detection task under different experience conditions. We found that maximizing the recent experience with a particular image led to an improvement in the ability to detect a change in that image. This improvement was associated with decreased neural responses to the image, consistent with neuronal changes previously seen in studies of adaptation and expectation. We found that the magnitude of behavioral improvement was correlated with the magnitude of response suppression. Furthermore, this suppression of activity led to an increase in signal separation, providing evidence that a reduction in activity can improve stimulus encoding. Within populations of neurons, greater recent experience was associated with decreased trial-to-trial shared variability, indicating that a reduction in variability is a key means by which experience influences perception. Taken together, the results of our study contribute to an understanding of how recent visual experience can shape our perception and behavior through modulating activity patterns in the mid-level visual cortex.

Key event-related potentials (ERPs) of perceptual decision-making such as centroparietal positivity (CPP) elucidate how evidence is accumulated toward a given choice. Furthermore, this accumulation can be impacted by visual target selection signals such as the N2 contralateral (N2c). How these underlying neural mechanisms of perceptual decision-making are influenced by the spatial congruence of distractors relative to target stimuli remains unclear. Here, we used electroencephalography (EEG) in humans of both sexes to investigate the effect of distractor spatial congruency (same vs different hemifield relative to targets) on perceptual decision-making. We confirmed that responses for perceptual decisions were slower for spatially incongruent versus congruent distractors of high salience. Similarly, markers of target selection (N2c peak amplitude) and evidence accumulation (CPP slope) were found to be lower when distractors were spatially incongruent versus congruent. To evaluate the effects of congruency further, we applied drift diffusion modeling to participant responses, which showed that larger amplitudes of both ERPs were correlated with shorter nondecision times when considering the effect of congruency. The modeling also suggested that congruency's effect on behavior occurred prior to and during evidence accumulation when considering the effects of the N2c peak and CPP slope. These findings point to spatially incongruent distractors, relative to congruent distractors, influencing decisions as early as the initial sensory processing phase and then continuing to exert an effect as evidence is accumulated throughout the decision-making process. Overall, our findings highlight how key electrophysiological signals of perceptual decision-making are influenced by the spatial congruence of target and distractor.

Santiago, Chile- The declaration of the XXI Specialized Meeting on Family Farming of MERCOSUR (REAF, in Spanish) held last week in Argentina, acknowledged the advances promoted by FAO’s Director General, [...]

Human remains discovered at Wharram Percy are about to be examined by an expert, in a bid to determine what happened. Is it a medieval murder mystery—or something far more sinister?

Home to more than 300 artists, the neighborhood was submerged under the record-high waters of the French Broad River

Since her birth in 1909, Francis lived through two world wars, segregation, the fall of the Soviet Union, multiple pandemics and the invention of the cellphone

It's not the first time savvy entrepreneurs have marketed canned air to tourists. Similar products have been sold at vacation destinations for decades

Water quality guidelines for mercury are 0.02 micrograms per litre of water. Several results show that levels at four sites are far above that threshold. During the second week of October, one value close to the mine was more than seven times the acceptable level.

In the Jim Crow South, activists became martyrs at the hands of white racists, all for the just cause of using the vote to fight for equality and freedom

CME Group, the world's leading derivatives marketplace, today announced it has received approval from the National Futures Association (NFA) to establish a futures commission merchant (FCM). "We...

Intuitive Software Fosters Rapid Engagement with Engineering Challenges

Motion control product leader to cut custom part configuration from days to minutes

World's largest supplier of food weighing machines to automate custom product configuration with 3D CAD software

Manufacturing leader quantifies savings in multiple phases of development process