D. V. Gusak and E. V. Karnaukh
Theor. Probability and Math. Statist. 99 (2020), 77-89.
Abstract, references and article information

Alexander J. Rasmussen
Proc. Amer. Math. Soc. 148 (2020), 2345-2357.
Abstract, references and article information

The 'unicorn letter', sent by some of the best-funded private technology companies in the country, asks the chancellor to form an urgent taskforce to give them access to government-backed lending schemes during the pandemic

(Arizona State University) Cun-Zheng Ning, a professor of electrical engineering in the Ira A. Fulton Schools of Engineering at Arizona State University, and collaborators from Tsinghua University in China discovered a process of physics that enables low-power nanolasers to be produced in 2D semiconductor materials. Understanding the physics behind lasers at nanoscale and how they interact with semiconductors can have major implications for high-speed communication channels for supercomputers and data centers.

The canonical pathway of eicosanoid production in most mammalian cells is initiated by phospholipase A2-mediated release of arachidonic acid, followed by its enzymatic oxidation resulting in a vast array of eicosanoid products. However, recent work has demonstrated that the major phospholipase in mitochondria, iPLA2γ (patatin-like phospholipase domain containing 8 (PNPLA8)), possesses sn-1 specificity, with polyunsaturated fatty acids at the sn-2 position generating polyunsaturated sn-2-acyl lysophospholipids. Through strategic chemical derivatization, chiral chromatographic separation, and multistage tandem MS, here we first demonstrate that human platelet-type 12-lipoxygenase (12-LOX) can directly catalyze the regioselective and stereospecific oxidation of 2-arachidonoyl-lysophosphatidylcholine (2-AA-LPC) and 2-arachidonoyl-lysophosphatidylethanolamine (2-AA-LPE). Next, we identified these two eicosanoid-lysophospholipids in murine myocardium and in isolated platelets. Moreover, we observed robust increases in 2-AA-LPC, 2-AA-LPE, and their downstream 12-LOX oxidation products, 12(S)-HETE-LPC and 12(S)-HETE-LPE, in calcium ionophore (A23187)-stimulated murine platelets. Mechanistically, genetic ablation of iPLA2γ markedly decreased the calcium-stimulated production of 2-AA-LPC, 2-AA-LPE, and 12-HETE-lysophospholipids in mouse platelets. Importantly, a potent and selective 12-LOX inhibitor, ML355, significantly inhibited the production of 12-HETE-LPC and 12-HETE-LPE in activated platelets. Furthermore, we found that aging is accompanied by significant changes in 12-HETE-LPC in murine serum that were also markedly attenuated by iPLA2γ genetic ablation. Collectively, these results identify previously unknown iPLA2γ-initiated signaling pathways mediated by direct 12-LOX oxidation of 2-AA-LPC and 2-AA-LPE. This oxidation generates previously unrecognized eicosanoid-lysophospholipids that may serve as biomarkers for age-related diseases and could potentially be used as targets in therapeutic interventions.

(Louisiana State University Health Sciences Center) A study conducted at LSU Health New Orleans has shown for the first time that chronic exposure to inhaled nicotine alone increases blood pressure in both the body's general circulation and in the lungs that can lead to pulmonary hypertension. The study also found that nicotine-induced pulmonary hypertension is accompanied by changes in the size, shape and function (remodeling) of the blood vessels in the lung and the right lower chamber of the heart.

(Max Planck Institute for the Science of Human History) Three 16th-century skeletons from a mass burial in Mexico City highlight the role of the transatlantic slave trade in introducing and disseminating new pathogens to the Americas. Researchers from the Max Planck Institute for the Science of Human History and Escuela Nacional de Antropología e Historia in Mexico analyzed skeletal features, genetic data and isotopes to explore the life history of three enslaved Africans and explore the wide-ranging impacts of massive forced migration.

(Florida State University) Florida State University and partner universities investigated current baseline conditions in the southern Gulf to create a series of maps and guides that detail the distribution of carbon, nitrogen and the carbon-14 isotope.

The canonical pathway of eicosanoid production in most mammalian cells is initiated by phospholipase A2-mediated release of arachidonic acid, followed by its enzymatic oxidation resulting in a vast array of eicosanoid products. However, recent work has demonstrated that the major phospholipase in mitochondria, iPLA2γ (patatin-like phospholipase domain containing 8 (PNPLA8)), possesses sn-1 specificity, with polyunsaturated fatty acids at the sn-2 position generating polyunsaturated sn-2-acyl lysophospholipids. Through strategic chemical derivatization, chiral chromatographic separation, and multistage tandem MS, here we first demonstrate that human platelet-type 12-lipoxygenase (12-LOX) can directly catalyze the regioselective and stereospecific oxidation of 2-arachidonoyl-lysophosphatidylcholine (2-AA-LPC) and 2-arachidonoyl-lysophosphatidylethanolamine (2-AA-LPE). Next, we identified these two eicosanoid-lysophospholipids in murine myocardium and in isolated platelets. Moreover, we observed robust increases in 2-AA-LPC, 2-AA-LPE, and their downstream 12-LOX oxidation products, 12(S)-HETE-LPC and 12(S)-HETE-LPE, in calcium ionophore (A23187)-stimulated murine platelets. Mechanistically, genetic ablation of iPLA2γ markedly decreased the calcium-stimulated production of 2-AA-LPC, 2-AA-LPE, and 12-HETE-lysophospholipids in mouse platelets. Importantly, a potent and selective 12-LOX inhibitor, ML355, significantly inhibited the production of 12-HETE-LPC and 12-HETE-LPE in activated platelets. Furthermore, we found that aging is accompanied by significant changes in 12-HETE-LPC in murine serum that were also markedly attenuated by iPLA2γ genetic ablation. Collectively, these results identify previously unknown iPLA2γ-initiated signaling pathways mediated by direct 12-LOX oxidation of 2-AA-LPC and 2-AA-LPE. This oxidation generates previously unrecognized eicosanoid-lysophospholipids that may serve as biomarkers for age-related diseases and could potentially be used as targets in therapeutic interventions.

This study sought to determine brain nicotine kinetics from the use of increasingly popular electronic cigarettes (E-cigs). Methods: Brain uptake of nicotine following inhalation from E-cigs was directly assessed in 17 E-cig users (8 females), using ¹¹C-nicotine and positron emission tomography. The brain nicotine kinetics parameters from E-cigs were compared with those from smoking combustible cigarettes (C-cigs). Results: After inhalation of a single puff of E-cig vapor, brain nicotine concentration rose quickly (mean T1/2 27 sec) with a peak amplitude 25% higher in females than males, resembling previous observations with C-cigs. Nonetheless, brain nicotine accumulation from E-cigs was smaller than that from C-cigs in both males and females (24% and 32%, respectively). Conclusion: E-cigs can deliver nicotine rapidly to the brain. Therefore, to the extent that rapid brain uptake promotes smoking reward, e-cigarettes might maintain a degree of nicotine dependence and also serve as non-combustible substitutes for cigarettes.

Invitation Only Research Event

Event participants

Professor Nick Binedell, Founding Director and Sasol Chair of Strategic Management, Gordon Institute of Business Science (GIBS), University of Pretoria

Recurrent urinary tract infections (UTIs) pose a significant burden on the health care system. Underlying mechanisms predisposing children to UTIs and associated changes in the urinary proteome are not well understood. We aimed to investigate the urinary proteome of a subset of children who have vesicoureteral reflux (VUR) and recurrent UTIs because of their risk of developing infection-related renal damage. Improving diagnostic modalities to identify UTI risk factors would significantly alter the clinical management of children with VUR. We profiled the urinary proteomes of 22 VUR patients with low grade VUR (1–3 out of 5), a history of recurrent UTIs, and renal scarring, comparing them to those obtained from 22 age-matched controls. Urinary proteins were analyzed by mass spectrometry followed by protein quantitation based on spectral counting. Of the 2,551 proteins identified across both cohorts, 964 were robustly quantified, as defined by meeting criteria with spectral count (SC) ≥2 in at least 7 patients in either VUR or control cohort. Eighty proteins had differential expression between the two cohorts, with 44 proteins significantly up-regulated and 36 downregulated (q <0.075, FC ≥1.2). Urinary proteins involved in inflammation, acute phase response (APR), modulation of extracellular matrix (ECM), and carbohydrate metabolism were altered among the study cohort.

David Price is in the host's chair this week, as the team talk about the latest hot tech topics. Tamlin Magee has got the drinks in - futuristic meal-replacement drinks called Soylent, which he forces everyone to try and which are apparently not people.

Then Dominic Preston talks us through the positive and extremely negative sides of Amazon's Black Friday activities, before Sean Bradley attempts to explain why Bitcoin is tanking and what the future holds for crypto currencies. Cheers!

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Using the NCR form of a surrogate pair as an input string to the UNICODE function does not convert the string to the appropriate display character.

Mandeep Bajaj
Dec 1, 2012; 61:3078-3080
Commentary

Elisabeth F.C. van Rossum
Oct 1, 2002; 51:3128-3134
Genetics

Invitation Only Research Event

Event participants

Jude Webber, Mexico and Central America Correspondent, Financial Times
Michael Stott, Latin America Editor, Financial Times
Chair: Dr Christopher Sabatini, Senior Research Fellow for Latin America, US and the Americas Programme, Chatham House

Dr shailesh kumar garge is an Vascular specialist and surgeons in Hyderabad with high success rate. Experienced endovascular and micro vascular specialist in gachibowli, hitech city | vascular surgeon in

When I tell people that I do not remember learning how to read, they laugh. But I really do not recall learning to read. Reading was an activity that excited my family, and so it was no surprise that I would love reading. The love of books and...

Long-term hyperglycemia in patients with diabetes leads to human serum albumin (HSA) glycation, which may impair HSA function as a transport protein and affect the therapeutic efficacy of anticoagulants in patients with diabetes. In this study, a novel mass spectrometry approach was developed to reveal the differences in the profiles of HSA glycation sites between patients with diabetes and healthy subjects. K199 was the glycation site most significantly changed in patients with diabetes, contributing to different interactions of glycated HSA and normal HSA with two types of anticoagulant drugs, heparin and warfarin. An in vitro experiment showed that the binding affinity to warfarin became stronger when HSA was glycated, while HSA binding to heparin was not significantly influenced by glycation. A pharmacokinetic study showed a decreased level of free warfarin in the plasma of diabetic rats. A preliminary retrospective clinical study also revealed that there was a statistically significant difference in the anticoagulant efficacy between patients with diabetes and patients without diabetes who had been treated with warfarin. Our work suggests that larger studies are needed to provide additional specific guidance for patients with diabetes when they are administered anticoagulant drugs or drugs for treating other chronic diseases.

Sagicor Finance Company has raised doubt about whether the deal to acquire the assets of Scotia Life Trinidad...

Marking the release of MPI President Andrew Selee's latest book, speakers explore emerging trends in migration, economic interdependence, technology innovation, and cultural exchange that are transforming the relationship between the United States and Mexico, and the policy implications of these changes for the future.

The House is set to vote on two bills that would largely dismantle the U.S. asylum system at the southern border by significantly narrowing grounds to apply for asylum, eliminating protections for the vast majority of unaccompanied minors, and unilaterally declaring Mexico a safe third country. The result would be a sharp reduction in the number of people permitted to seek humanitarian protection, as this commentary explains.

Remain in Mexico—the Trump administration policy aimed at deterring the rising numbers of migrants from Central America by requiring them to stay in Mexico through most of their U.S. asylum adjudication process—bears striking similarities to U.S. policy in the 1980s and 1990s that sought to discourage Haitians from making the sea journey to the United States. This article explores the parallels and differences between Remain in Mexico and the earlier narrowing of asylum for Haitians.

Approximately 11,500 unaccompanied children were apprehended at the U.S.-Mexico border in May, putting this year on track to exceed 2014's surge. As the U.S. government struggles to care for these child migrants, with public outrage mounting over reports of unsafe, filthy conditions in initial Border Patrol custody, the failure of the executive branch and Congress to plan for increased shelter and care demands are increasingly apparent, as this article explores.

Marking the release of an MPI report, speakers on this webinar present an overview of regional immigration enforcement trends, including U.S. and Mexican apprehensions and deportations of both children and adults, along with a demographic, socioeconomic, and criminal profile of child and adult deportees.

This report examines the rising numbers of apprehensions and deportations of Central American children and adults by the United States and Mexico, and provides a demographic, socioeconomic, and criminal profile of deportees to El Salvador, Guatemala, and Honduras. The report traces how rising Mexican enforcement is reshaping regional dynamics and perhaps ushering in changes to long-lasting trends in apprehensions.

This webinar includes an overview of regional immigration enforcement trends, including U.S. and Mexican apprehensions and deportations of Central American migrants, along with a demographic, socioeconomic, and criminal profile of child and adult deportees.

Una llamada en español que analiza las dinámicas cambiantes y las cuestiones políticas relacionadas con la migración a través de México a los Estados Unidos.

Durante este seminario, ponentes presentaron hallazgos de un reciente informe que utiliza datos de agencias gubernamentales mexicanas, entrevistas con funcionarios clave y relatos de la sociedad civil para examinar el marco legal para la protección de menores no acompañados y su aplicación, al igual que las brechas entre este marco y su aplicación durante los procesos de detención, interrogación y alojamiento. El presidente de MPI, Andrew Selee, también expuso cómo el cambio en la dinámica política en Estados Unidos puede afectar las cuestiones migratorias con México, así como los efectos en la relación bilateral en medio de tensiones sobre el muro fronterizo, la renegociación del acuerdo del TLCAN y una cifra significativa de repatriaciones de migrantes mexicanos.

Marking the release of MPI President Andrew Selee's book, this discussion explores the emerging trends in migration, economic interdependence, technology innovation, and cultural exchange that are transforming the relationship between the United States and Mexico.

Authors of a year-long study of reception and reintegration services in Mexico and the Northern Triangle discuss the findings of their fieldwork, including the differing reintegration needs of individual migrant groups, promising reception and reintegration programs, ongoing challenges for origin communities, and policy recommendations to improve reintegration strategies. 

How did the U.S. border enforcement picture go in the span of two years from the lowest levels of illegal immigration since 1971 to a spiraling border security and humanitarian crisis? This report draws on enforcement and other data as well as analysis of changing migration trends and policies to tell this story. The authors outline key elements for a new strategy that can succeed over the long term.

Steven M Haffner
Oct 1, 1996; 19:1138-1141
Short Report

While safe third-country agreements appear to hold the potential of deterring new asylum claims, experience suggests this may be a false promise. As the Trump administration explores the possibility of such agreements with Mexico and Guatemala, this commentary examines the evidence of safe third-country arrangements in Europe, finding them difficult to enforce and playing little role in deterring new claims.

Presentación del reporte que refleja el contenido de encuentros del grupo de estudio sobre la migración México-Estados Unidos convocado por El Colegio de México y el Migration Policy Institute (MPI).

Through a set of interlocking policies, the Trump administration has walled off the asylum system at the U.S.-Mexico border, guaranteeing that only a miniscule few can successfully gain protection. While the Migrant Protection Protocols, more commonly known as Remain in Mexico, have been a key part of throttling asylum applications, two newer, far less visible programs hold the potential to complete the job, as this article explores.

This MPI webinar focuses on reception and reintegration services for returning migrants, along with the heightened pressure policymakers in Mexico and Central America are facing to design systems and programs that support both returnees and the communities in which they settle. Authors of a year-long study of reception and reintegration services in Mexico and the Northern Triangle discuss the findings of their fieldwork.

On her first official trip to Washington, DC, Secretary of the Interior Olga Sánchez Cordero offered a public address on Mexico’s new approach to migration policy at MPI. Her remarks and the event discussion were mostly conducted in Spanish, and this recording is of the simultaneous English interpretation. 

Over recent months, the number of Central American migrants apprehended at the U.S.-Mexico border has surged, presenting a critical challenge in the relationship between the two neighboring countries. Experts from a Study Group on U.S.-Mexico Migration convened by El Colegio de México and MPI discuss current trends, policies, and politics surrounding migration from the Northern Triangle of Central America and the U.S.-Mexico relationship, ways to improve U.S. and Mexican asylum systems, possible new approaches to labor migration, ways to address smuggling networks, and modernize border management.

This event organized by the Migration Policy Institute and American Enterprise Institute features a conversation on U.S.-Mexico border conditions, as well as policy responses and regional cooperation on illegal immigration. 

This event features a smart conversation by a range of experts on U.S.-Mexico border conditions, looking at policy responses by both countries and regional cooperation.

Amid surging migration from Central America, the United States and Mexico in June 2019 agreed to a series of enforcement measures. Yet these near-term efforts will be difficult to maintain given chronic institutional weaknesses and poorly thought-out policy structures in both countries. This commentary, by the presidents of MPI and El Colegio de México, offers a set of long-term, collaborative solutions to dissuade illegal migration while ensuring fairness to those seeking protection.

Dado el incremento de los flujos migratorios provenientes de Centroamérica, el pasado mes de junio de 2019, los Estados Unidos y México acordaron tomar una serie de medidas para reducir los flujos irregulares. Sin embargo, será muy difícil mantener estos esfuerzos de corto plazo, debido a una debilidad institucional crónica y a estructuras de política pública poco planificadas en ambos países. Este comentario ofrece cinco recomendaciones a ambos países considerando soluciones de mediano y largo plazo para disuadir la migración irregular y, al mismo tiempo, garantizar que aquellos que busquen protección tengan un proceso justo.

The U.S.-based International Medical Relief is sponsoring outreach trips to Puerto Rico in response to the earthquakes that have devastated the region.