DNA polymerase from bacteriophage T7 undergoes large, substrate-induced conformational changes that are thought to account for high replication fidelity, but prior studies were adversely affected by mutations required to construct a Cys-lite variant needed for site-specific fluorescence labeling. Here we have optimized the direct incorporation of a fluorescent un-natural amino acid, (7-hydroxy-4-coumarin-yl)-ethylglycine, using orthogonal amber suppression machinery in Escherichia coli. MS methods verify that the unnatural amino acid is only incorporated at one position with minimal background. We show that the single fluorophore provides a signal to detect nucleotide-induced conformational changes through equilibrium and stopped-flow kinetic measurements of correct nucleotide binding and incorporation. Pre-steady-state chemical quench methods show that the kinetics and fidelity of DNA replication catalyzed by the labeled enzyme are largely unaffected by the unnatural amino acid. These advances enable rigorous analysis to establish the kinetic and mechanistic basis for high-fidelity DNA replication.

Homologous recombination (HR) repairs DNA double-strand breaks using intact homologous sequences as template DNA. Broken DNA and intact homologous sequences form joint molecules (JMs), including Holliday junctions (HJs), as HR intermediates. HJs are resolved to form crossover and noncrossover products. A mismatch repair factor, MLH3 endonuclease, produces the majority of crossovers during meiotic HR, but it remains elusive whether mismatch repair factors promote HR in nonmeiotic cells. We disrupted genes encoding the MLH3 and PMS2 endonucleases in the human B cell line, TK6, generating null MLH3−/− and PMS2−/− mutant cells. We also inserted point mutations into the endonuclease motif of MLH3 and PMS2 genes, generating endonuclease death MLH3DN/DN and PMS2EK/EK cells. MLH3−/− and MLH3DN/DN cells showed a very similar phenotype, a 2.5-fold decrease in the frequency of heteroallelic HR-dependent repair of restriction enzyme–induced double-strand breaks. PMS2−/− and PMS2EK/EK cells showed a phenotype very similar to that of the MLH3 mutants. These data indicate that MLH3 and PMS2 promote HR as an endonuclease. The MLH3DN/DN and PMS2EK/EK mutations had an additive effect on the heteroallelic HR. MLH3DN/DN/PMS2EK/EK cells showed normal kinetics of γ-irradiation–induced Rad51 foci but a significant delay in the resolution of Rad51 foci and a 3-fold decrease in the number of cisplatin-induced sister chromatid exchanges. The ectopic expression of the Gen1 HJ re-solvase partially reversed the defective heteroallelic HR of MLH3DN/DN/PMS2EK/EK cells. Taken together, we propose that MLH3 and PMS2 promote HR as endonucleases, most likely by processing JMs in mammalian somatic cells.

Will Rhys Hoskins be bummed if Bryce Harper signs elsewhere?

It's almost time for Spring Training yet again, as Angels pitchers and catchers report to their Spring Training complex in Tempe, Ariz. on Feb. 12.

Spring Training is officially here for the Angels, with pitchers and catchers reporting to Tempe Diablo Stadium on Tuesday. And there's a new face at manager, with Brad Ausmus replacing longtime skipper Mike Scioscia this offseason.

Chatham House Primer: Inside China’s government 30 November 2022 — 6:00PM TO 6:45PM Anonymous (not verified) 4 October 2022 Chatham House

How are decisions made in Beijing, across China and where does the CCP fit in?

Still little is known in Western circles about the inner workings of China’s government. In power since 1949, the ruling Chinese Communist Party has evolved over decades to its current embodiment under President Xi Jinping.

The need for a better understanding of China’s government has been heightened, particularly as the country navigates post-COVID troubles, global economic downturns, wars in Europe, climate change and heightened tension with the United States.

This Primer has been prepared to pull back the veil on the Chinese government. Key issues to be tackled include:

• What is the decision-making process in China’s government?

• How is the party–government relationship best explained?

• How has the party evolved in recent years with new forms of governance and leadership?

• How has China’s government evolved in recent years, particularly in a globalized environment?

• A description of the central government–province dynamic?

• How are citizens engaged in the political process?

• What are the major centres of power in the Chinese political system?

• Has the COVID-19 pandemic altered attitudes towards and the operation of government?

As with all Chatham House member events, questions from members drive the conversation.

The road to COP27: In conversation with US Special Presidential Envoy for Climate John Kerry 27 October 2022 — 3:00PM TO 4:00PM Anonymous (not verified) 20 October 2022 Chatham House and Online

What will progress on climate change look like at COP27?

With global attention zeroing in on COP27, policymakers and world leaders will meet in Egypt to take the next step in the fight against the climate crisis. The planet is on course to warm well beyond 1.5°C and climate hazards are increasing our exposure to climate risk. Violent and unpredictable weather events increasingly leave devastation among communities, particularly in vulnerable countries.

At the same time, the ripple effects of the conflict in Ukraine will have wide-ranging economic, social and geopolitical consequences for years to come. Whilst some finance is being made available, more is needed to properly address the damage caused by climate change and fund the transition to net zero worldwide. These challenges have become more acute as the world grapples with a growing energy crisis, the war in Ukraine and a troubling economic outlook.

Joined by US Special Presidential Envoy for Climate John Kerry, the following questions are considered:

• Is ‘1.5 degrees’ still on track?

• How can countries better collaborate to move to net zero faster?

• How can we achieve progress on adaptation, climate finance, and loss and damage?

As with all members events, questions from the audience drive the conversation.

Read the transcript. 

Belarus-EU border crisis reveals wider security threat Expert comment NCapeling 8 December 2021

By engineering a crisis at the Belarus border, Lukashenka is attempting to exacerbate vulnerabilities within the EU. Securitizing migration is not the answer.

When thousands of migrants began freezing to death in the forests on the Belarus border with Poland, Belarusian leader Aliaksandr Lukashenka was forcing the European Union (EU) into a tough choice – either give in to blackmail and welcome migrants whose attempts to trespass the EU border were a result of his policy of luring them to Belarus to put pressure on the EU, or keep the borders closed and declare solidarity with Poland despite its known mistreatment and illegal pushbacks of potential asylum-seekers.

Lukashenka’s action was aptly exploiting three key pressure points of the EU – as a normative power where the human dignity of migrants is overlooked while the European border and coastguard agency Frontex stands by, as a geopolitical actor seeking to externalize its migration problem by signing readmission agreements with transit countries, and as a community of values with the EU-Poland dispute over rule of law.

His approach is typical ‘dictaplomacy’ and democracies which have confronted such a ‘continuation of war by other means’ in their past dealings with dictatorships know that blackmail mostly serves to divert attention away from a rogue leader’s misdemeanours towards his own population. But if this had been game of chess the EU would have been in check.

Thankfully checkmate was avoided – so far – as a compromise was found following weeks of heightened diplomatic efforts. Lukashenka was forced to back-pedal and take care of the migrants, and no humanitarian corridor was needed as the EU sent funds and took measures to support organizations providing shelter for the migrants in Belarus, while airlines and governments in the source countries were pressured to restrict flights to Minsk and started repatriating part of the migrants.

Causing a nuisance

‘Operation Gateway’ – the outline of which was allegedly drawn several years ago and tested by Russia in 2016 at its own borders with Norway and Finland – certainly caused a nuisance, but it ultimately backfired as Lukashenka now has to manage the remaining 2,000-5,000 migrants who refused to be flown back, as well as facing increased international sanctions. However, the fact that Angela Merkel had to personally call him made it look as if Lukashenka did not back down for nothing.

The EU and NATO, including the UK, only reacted collectively to this crisis once it was already out of hand, leaving questions over whether this experience of Lukashenka’s dictaplomacy is a wake-up call to boost resilience against rogue warfare, and to upgrade strategic assessments of the ‘Lukashenka problem’ too.

Back in June, the Belarus ministry of foreign affairs (MFA) announced its withdrawal from the Eastern Partnership and the visa facilitation and readmission agreement with the EU, while Lithuania sent early warnings about a ‘hybrid attack’ at its own border with Belarus. In August, Der Spiegel reported details of an alleged smuggling scheme whereby Tsentr Kurort – a company closely linked to the Administration of the President of Belarus with offices in the Middle East – was handling the shipping, accommodation, and relocation of migrants.

The smuggling of migrants was entirely predictable as Lukashenka has hinted many times Belarus could stop ‘protecting the EU from armed migrants’ seeking to enter it illegally. He has upped his rhetoric beyond notions of hybrid warfare by saying he needs Russian nuclear-capable bombers to ‘help him navigate the migrant crisis’, even hinting Belarus could station both Russian nuclear weapons and S-400 anti-aircraft missile systems. This shows Lukashenka is feeling increasingly cornered – which could lead to more unpredictable security crises.

Russia and Belarus are deepening relations

Although there is no smoking gun pointing to direct Russian involvement in orchestrating the hybrid attack at the EU’s borders, a new step in the military rapprochement between the two countries came when Putin and Lukashenka approved a new Military Doctrine of the Union-State of Russia and Belarus – a non-public document including a joint concept of migration policy. Lukashenka has also come off the fence over Crimea by openly accepting the legality of the peninsula’s integration with Russia.

Given Russia is also sabre-rattling over Ukraine, the risk of an accidental escalation into armed conflict is increasing in what feels like a return to classic Cold War logic, with the difference that the East is now offensively using the South for confronting the West. In recognition of the threat, the UK has joined the US, Canada, and the EU in the fresh sanctions on Belarus.

President Maia Sandu on democracy and politics in Moldova Video jon.wallace 4 July 2022

The president covers Moldova’s challenges as it seeks closer integration with the European Union.

President Maia Sandu discusses challenges to Moldovan democracy and society during an interview at Chatham House’s 2022 London Conference.

She covers issues including corruption, the presence of Russian troops in the Transnistria region, neutrality in Moldova’s constitution, popular support for EU membership and refugees from Russian aggression in Ukraine.

Understanding which patients with human epidermal growth factor receptor 2 (HER2)–negative or –low metastatic breast cancer (MBC) benefit from HER2-targeted strategies is urgently needed. We assessed the whole-body heterogeneity of HER2 expression on ⁸⁹Zr-trastuzumab PET (HER2 PET) and the diagnostic performance of HER2 PET in a large series of patients, including HER2-negative and -low MBC. Methods: In the IMPACT-MBC study, patients with newly diagnosed and nonrapidly progressive MBC of all subtypes were included. Metastasis HER2 status was determined by immunohistochemistry and in situ hybridization.⁸⁹Zr-trastuzumab uptake was quantified as SUV_max and SUV_mean. HER2 immunohistochemistry was related to the quantitative ⁸⁹Zr-trastuzumab uptake of all metastases and corresponding biopsied metastasis, uptake heterogeneity, and qualitative scan evaluation. A prediction algorithm for HER2 immunohistochemistry positivity based on uptake was developed. Results: In 200 patients, ⁸⁹Zr-trastuzumab uptake was quantified in 5,163 metastases, including 186 biopsied metastases. With increasing HER2 immunohistochemistry status, uptake was higher (geometric mean SUV_max of 7.0, 7.6, 7.3, and 17.4 for a HER2 immunohistochemistry score of 0, 1, 2, or 3+, respectively; P < 0.001). High uptake exceeding 14.6 (90th percentile) was observed in one third of patients with a HER2-negative or -low metastasis biopsy. The algorithm performed best when lesion site and size were incorporated (area under the curve, 0.86; 95% CI, 0.79–0.93). Conclusion: HER2 PET had good diagnostic performance in MBC, showing considerable whole-body HER2 heterogeneity and uptake above background in HER2-negative and -low MBC. This provides novel insights into HER2-negative and -low MBC compared with standard HER2 immunohistochemistry on a single biopsy.

Following early acceptance by urologists, the use of surgical robotic platforms is rapidly spreading to other surgical fields. This empowerment of surgical perception via robotic advances occurs in parallel to developments in intraoperative molecular imaging. Convergence of these efforts creates a logical incentive to advance the decades-old image-guided robotics paradigm. This yields new radioguided surgery strategies set to optimally exploit the symbiosis between the growing clinical translation of robotics and molecular imaging. These strategies intend to advance surgical precision by increasing dexterity and optimizing surgical decision-making. In this state-of-the-art review, topic-related developments in chemistry (tracer development) and engineering (medical device development) are discussed, and future scientific robotic growth markets for molecular imaging are presented.

Officials in Mexico and across Latin America are anxiously watching the outcome of Tuesday's U.S. Presidential contest in light of GOP candidate Donald Trump's campaign promise to "deport 11 million criminal aliens."

The Dow Jones Industrial Average and the S&P 500 hit new highs in early trading on Wednesday as former President Donald Trump claimed victory in Tuesday's presidential election over Kamala Harris.

A pair of strong earthquakes has struck off the southern coast of Cuba, inflicting damage and causing landslides.

The Dallas Cowboys agreed to trade a fourth-round pick in the 2025 NFL Draft to the Carolina Panthers in exchange for wide receiver Jonathan Mingo and a seventh-round pick, a league source told UPI on Tuesday.

Brian Thomas Jr. and Jameson Williams are among UPI senior sports writer Alex Butler's four must-start wide receivers for Week 10 of the fantasy football campaign.

How can manufacturers apply lessons learned from the dawn of the “Exascale Era” to Computer-Aided Engineering to achieve results like never before? Join Addison Snell, CEO, Intersect360 Research, Bill Mannel, VP, High Performance […]

The post Leveraging Exascale Era Technology for Advanced Computer-Aided Engineering appeared first on HPCwire.

LONDON, Nov. 1, 2024 — Quantum Motion, a UK-based quantum computing scale-up founded by Professor John Morton, University College London (UCL), and Professor Simon Benjamin, University of Oxford, has worked […]

The post Quantum Motion and Goldman Sachs Identify Quantum Applications in Financial Services Project appeared first on HPCwire.

The USS Frank E. Petersen Jr. cleared another hurdle toward joining the Navy's fleet after it completed acceptance trials on Thursday.

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.

The U.S. Navy conducted a two-missile test flight of unarmed life-extended Trident II-D5LE missiles from the USS Wyoming in the Eastern Test Range off the coast of Cape Canaveral, Fla, the Navy announced.

An arms contractor is making "good progress" on the production of five B-21 Raider stealth bombers, U.S. Air Force Secretary Frank Kendall disclosed during a speech on Monday.

Four U.S. Marines remain hospitalized after an attack near Hamid Karzai International Airport in Kabul, Afghanistan, last month as service members were evacuating foreign nationals and refugees.

The U.S. Army is investigating the suspected suicides of three soldiers based at New York's Fort Drum.

The epidemic of sexually transmitted infections (STIs) in the United States appears to be cooling off after more than two decades, a new Centers for Disease Control and Prevention (CDC) study says.

ATLANTA, Nov. 12, 2024 — Sylabs, in collaboration with Sandia National Laboratories, will host a Birds of a Feather (BoF) session at SC24 titled Integrating Confidential Computing into High-Performance Cloud Workflows. […]

The post Sylabs Highlights Confidential Computing in HPC at SC24 BoF Session appeared first on HPCwire.

Unpleasant emotions like sadness and anger can feel overwhelming, but recent research suggests they can trigger behaviors that lead to something better

The nation's depleted supply of IV solutions is recovering after a North Carolina facility recently resumed production after Hurricane Helene temporarily put it out of business.

President Joe Biden on Monday addressed a Veterans Day crowd at the national cemetery in Virginia where he revealed newly-expanded veteran benefits and urged Americans to "come together" and "keep faith."

President Joe Biden will hold a White House meeting with President Prabowo Subianto of Indonesia on Tuesday to celebrate 75 years of U.S.-Indonesian relations and discuss ways to strengthen their countries' cooperation.

K-pop group Stray Kids released the Japanese album "Giant" and a music video for its song of the same name.

A New York Supreme Court justice will decide Tuesday if President-elect Donald Trump's sentencing will move forward later this month.

President Joe Biden and Israeli President Isaac Herzog met at the White House on Tuesday afternoon to discuss the war against Hamas and Hezbollah and other Middle East concerns.

President-elect Donald Trump on Monday announced plans to nominate South Dakota Gov. Kristi Noem to head the Department of Homeland Security of his incoming administration.

President-elect Donald Trump on Tuesday night announced his nomination of Fox News host and Army veteran Pete Hegseth to head the Department of Defense.

NASA has identified nine possible landing sites for its Artemis III mission in September 2026 that will return astronauts to the moon for the first time in more than 50 years, the space agency announced Monday.

The therapy helps the brain work more efficiently and lifts depression.

Up to 50% of people admit cheating on their partner.

It is linked to higher risk of self-harm and suicidal thoughts.

This positive personality trait linked to more suicidal thoughts and suicide itself.

The core beliefs that cause the most common problems fall into the following 3 categories. These core beliefs commonly underlie depression and anxiety. Helpless Core Beliefs such as: “I’m incompetent” “I’m needy” “I’m weak” “I’m defective, I don’t measure up” “I’m a failure” Unlovable Core Beliefs such as: “I’m unlovable” “I’m different” “I’m bound to […]

The post How To Change Negative Core Beliefs: A Straightforward Guide to Cognitive Behavioral Therapy (CBT) appeared first on Dr Alice Boyes.

The U.S. Supreme Court agreed to review a decision by Montana's highest court that struck down a tuition tax-credit program allowing tuition scholarships to benefit students at private religious schools.

The new U.S. Department of Education guidance creates a federal process for individuals and organizations to file complaints under the federal Religious Freedom Restoration Act.