VOLUME 295 (2020) PAGES 4079–4092There was an error in the abstract. “The pyridinium cation hampers uptake of OPs into the central nervous system (CNS)” should read as “The pyridinium cation hampers uptake into the central nervous system (CNS).”

On the podcast, we’ve talked a lot about the limits of medicine - where treatment doesn’t work, or potentially harms. But in that conversation, we’ve mainly focused on specific treatments. Now a new analysis, broadens that to talk about patients being admitted to a whole ward - intensive care. The authors of that article contend that, often,...

This week, Ray ventures into the notoriously complex field of nutrition with special guest, Professor Marion Nestle. Named by Forbes as one of the world's most powerful foodies, Marion’s stellar career spans five decades of research, teaching, advocacy work and the publication of countless prize-winning books.

Employees at an Oregon restaurant said a peacock has taken on the role of protector for a mother duck and the eggs she laid in the closed patio area.

The National Commission on Recognition of Dental Specialties and Certifying Boards announced March 4 it recognizes the American Dental Board of Anesthesiology as the national certifying board for dental anesthesiology.

The ambitious immigration overhaul package that Congress is studying has drawn criticism from conservatives who say it offers amnesty to lawbreakers, and from immigration advocates who say it will not do enough to bring millions of people out of the shadows.

Przybylo, Henry Jay.

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London : Scientific Press, 1895.

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London : Cassell, 1902.

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Goettingae : Litteris Ioann. Christ. Dieterich, Acad. Typogr, [1781]

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Capitals forward Evgeny Kuznetsov doesn't consider his series-winning goal against the Penguins in 2018 is the biggest goal of his life.

Ningshan Zhang, Kyle Schmaus, Patrick O. Perry.

Source: The Annals of Applied Statistics, Volume 13, Number 4, 2260--2288.

Abstract:
We consider a particular instance of a common problem in recommender systems, using a database of book reviews to inform user-targeted recommendations. In our dataset, books are categorized into genres and subgenres. To exploit this nested taxonomy, we use a hierarchical model that enables information pooling across across similar items at many levels within the genre hierarchy. The main challenge in deploying this model is computational. The data sizes are large and fitting the model at scale using off-the-shelf maximum likelihood procedures is prohibitive. To get around this computational bottleneck, we extend a moment-based fitting procedure proposed for fitting single-level hierarchical models to the general case of arbitrarily deep hierarchies. This extension is an order of magnitude faster than standard maximum likelihood procedures. The fitting method can be deployed beyond recommender systems to general contexts with deeply nested hierarchical generalized linear mixed models.

Ian L. Dryden, Kwang-Rae Kim, Charles A. Laughton, Huiling Le.

Source: The Annals of Applied Statistics, Volume 13, Number 4, 2213--2234.

Abstract:
Molecular dynamics simulations produce huge datasets of temporal sequences of molecules. It is of interest to summarize the shape evolution of the molecules in a succinct, low-dimensional representation. However, Euclidean techniques such as principal components analysis (PCA) can be problematic as the data may lie far from in a flat manifold. Principal nested spheres gives a fundamentally different decomposition of data from the usual Euclidean subspace based PCA [ Biometrika 99 (2012) 551–568]. Subspaces of successively lower dimension are fitted to the data in a backwards manner with the aim of retaining signal and dispensing with noise at each stage. We adapt the methodology to 3D subshape spaces and provide some practical fitting algorithms. The methodology is applied to cluster analysis of peptides, where different states of the molecules can be identified. Also, the temporal transitions between cluster states are explored.

Federico Camerlenghi, David B. Dunson, Antonio Lijoi, Igor Prünster, Abel Rodríguez.

Source: Bayesian Analysis, Volume 14, Number 4, 1303--1356.

Abstract:
Discrete random structures are important tools in Bayesian nonparametrics and the resulting models have proven effective in density estimation, clustering, topic modeling and prediction, among others. In this paper, we consider nested processes and study the dependence structures they induce. Dependence ranges between homogeneity, corresponding to full exchangeability, and maximum heterogeneity, corresponding to (unconditional) independence across samples. The popular nested Dirichlet process is shown to degenerate to the fully exchangeable case when there are ties across samples at the observed or latent level. To overcome this drawback, inherent to nesting general discrete random measures, we introduce a novel class of latent nested processes. These are obtained by adding common and group-specific completely random measures and, then, normalizing to yield dependent random probability measures. We provide results on the partition distributions induced by latent nested processes, and develop a Markov Chain Monte Carlo sampler for Bayesian inferences. A test for distributional homogeneity across groups is obtained as a by-product. The results and their inferential implications are showcased on synthetic and real data.

Spanish translation of the BIS press release about the BIS Quarterly Review, March 2018

Nestin, an intermediate filament protein widely used as a marker of neural progenitors, was recently found to be expressed transiently in developing cortical neurons in culture and in developing mouse cortex. In young cortical cultures, nestin regulates axonal growth cone morphology. In addition, nestin, which is known to bind the neuronal cdk5/p35 kinase, affects responses to axon guidance cues upstream of cdk5, specifically, to Sema3a. Changes in growth cone morphology require rearrangements of cytoskeletal networks, and changes in microtubules and actin filaments are well studied. In contrast, the roles of intermediate filament proteins in this process are poorly understood, even in cultured neurons. Here, we investigate the molecular mechanism by which nestin affects growth cone morphology and Sema3a sensitivity. We find that nestin selectively facilitates the phosphorylation of the lissencephaly-linked protein doublecortin (DCX) by cdk5/p35, but the phosphorylation of other cdk5 substrates is not affected by nestin. We uncover that this substrate selectivity is based on the ability of nestin to interact with DCX, but not with other cdk5 substrates. Nestin thus creates a selective scaffold for DCX with activated cdk5/p35. Last, we use cortical cultures derived from Dcx KO mice to show that the effects of nestin on growth cone morphology and on Sema3a sensitivity are DCX-dependent, thus suggesting a functional role for the DCX-nestin complex in neurons. We propose that nestin changes growth cone behavior by regulating the intracellular kinase signaling environment in developing neurons. The sex of animal subjects is unknown.

SIGNIFICANCE STATEMENT Nestin, an intermediate filament protein highly expressed in neural progenitors, was recently identified in developing neurons where it regulates growth cone morphology and responsiveness to the guidance cue Sema3a. Changes in growth cone morphology require rearrangements of cytoskeletal networks, but the roles of intermediate filaments in this process are poorly understood. We now report that nestin selectively facilitates phosphorylation of the lissencephaly-linked doublecortin (DCX) by cdk5/p35, but the phosphorylation of other cdk5 substrates is not affected. This substrate selectivity is based on preferential scaffolding of DCX, cdk5, and p35 by nestin. Additionally, we demonstrate a functional role for the DCX-nestin complex in neurons. We propose that nestin changes growth cone behavior by regulating intracellular kinase signaling in developing neurons.

The prickly perch is an exciting sign of success for the birds, which came off the endangered species list in 2007

Beaches in Florida and Thailand have tentatively reported increases in nests, due to decreased human presence. But the trend won’t necessarily persist

On this week's edition of Olympic Games Replay, CBC Sports showcases some of the big moments from Canada's journey through the women's soccer tournament at the Rio Olympics.

Region of Waterloo Public Health says there are 44 positive cases of COVID-19 at the Breslau meat processing facility Conestoga Meats.

The Importance of Being Earnest

It is a tiny spit of land that lies in the Firth of Clyde two miles off the coast of Troon where colonies of seabirds have made their homes for centuries.

Immature animals exposed to anesthetics display apoptotic neurodegeneration and long-term cognitive deficiencies. In children, studies of cognitive deficits associated with anesthesia exposure have yielded mixed results. No studies to date have used directly administered neuropsychological assessments as outcome measures.

This study examines the association between exposure to anesthesia in children under age 3 and deficits at age 10 by using a battery of directly administered neuropsychological assessments, with deficits found in language and abstract reasoning associated with exposure. (Read the full article)

Although providing improved survival for infants with very severe cardiorespiratory problems, the use of neonatal extracorporeal membrane oxygenation has high rates of disability in survivors. Mild hypothermia has been shown to limit brain injury in a range of patient groups, including newborns.

Infants who received extracorporeal membrane oxygenation and mild hypothermia did not show an improved neurodevelopmental outcome, and nonsignificant trends in the data suggested a small adverse effect. Use of hypothermia in other potential patient groups should be thoroughly tested. (Read the full article)

Prenatal and postnatal organophosphate (cholinesterase inhibitor) pesticide exposure has been associated with delays in attention, memory, intelligence, and inhibitory control. Two recent studies reported decreased attention and working memory with greater exposure to organophosphates in boys but not in girls.

This is the first study to report associations between decreased acetylcholinesterase activity, a stable marker of cholinesterase inhibitor pesticide exposure, and lower overall neurodevelopment, attention, inhibitory control, and memory. These associations were present in boys but not in girls. (Read the full article)

Permanent neuronal deletion and neurocognitive impairment after anesthetic exposure in animals raised substantial concern that similar effects occur in children. Human studies were equivocal but have not combined structural and intelligence tests in otherwise healthy children after childhood anesthesia.

Anesthetic exposure for surgery did not lead to measurable neuronal elimination in brain regions previously identified in animals. However, language comprehension and performance IQ were decreased in exposed children and associated with decreased gray matter, primarily in posterior brain regions. (Read the full article)

South Africa’s efforts to foster peace and security have placed it centre stage in some of the continent’s most intractable conflicts. This is an inevitable result of the quest to promote “African solutions for African problems”.

The universe is full of questions waiting to be solved. So why teach science like all the discoveries have already been made? asks Alexander Bell.

After considering the evidences and conclusions in previous trials, the Court could not establish that the Trial Courts or the High Court were wrong in holding the case against the appellant. Implied consent for the trainer to fly an aircraft do not apply here, as there were telephonic signals sent to the aircraft, to bring it back. Wrongful gain can be mere unlawful acquisition of a property, creating ‘temporary’ loss to the Government. The circumstances conclude both the essential ingredients of theft – absence of consent and unlawfulness of means. From the factual analysis, the Court concludes that the wrongful gain and loss were intentional. However, considering that the appellant has already undergone imprisonment, his sentence was modified to the period already undergone. The appeal was dismissed while maintaining the conviction.

LEWES – The Point at Cape Henlopen State Park, including a stretch of ocean beach and dunes, and a half-mile along the bay shoreline, will close Sunday, March 1, for the benefit of threatened and endangered beachnesters and migratory shorebirds, including red knot, piping plovers, oystercatchers, least terns, and other species. The Point’s nesting habitat […]

Reduce your debts, cut expenses and choose investment products prudently to build your retirement corpus.

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