Background The Government’s latest proposal in reforming the English schooling system was laid before Parliament last week in the form of the Education and Adoption Bill 2015-16 (“the Bill”). The Bill sets out provisions to conver...

On 17 May 2019, the European Council established a framework and implemented a new sanctions regime which now allows the EU to impose targeted sanctions to “deter and respond to cyber-attacks which constitute an external threat to the EU and i...

Introducing Hong Kong’s four-step fining framework… On 29 April 2020, Justice Godfrey Lam, President of the Competition Tribunal, handed down judgment in relation to the fines to be imposed on the parties in the W. Hing and Others case....

In the last few years, there has been an increasing focus on the need for adequate ethics guidance for the use of artificial intelligence and robots – something we have regularly written and spoken about. For example, in 2017, MEPs from the E...

Legal liability for financial institutions and financial services firms when using artificial intelligence and machine learning Recent advances in the development of artificial intelligence (AI), coupled with the availability of sufficient computing...

Over 6,000 farmers have already planted the new varieties. The factory will need over eight tonnes of banana produce daily.

How do the athletes handle such sanctions?

Title: Does Dopamine Explain Why Slackers Slack?
Category: Health News
Created: 5/2/2012 11:00:00 AM
Last Editorial Review: 5/2/2012 12:00:00 AM

Title: How Long Does a Laparoscopic Nissen Fundoplication Last?
Category: Procedures and Tests
Created: 4/29/2020 12:00:00 AM
Last Editorial Review: 4/29/2020 12:00:00 AM

ABSTRACT

Channelrhodopsins guide algal phototaxis and are widely used as optogenetic probes for control of membrane potential with light. "Bacteriorhodopsin-like" cation channelrhodopsins (BCCRs) from cryptophytes differ in primary structure from other CCRs, lacking usual residues important for their cation conductance. Instead, the sequences of BCCR match more closely those of rhodopsin proton pumps, containing residues responsible for critical proton transfer reactions. We report 19 new BCCRs which, together with the earlier 6 known members of this family, form three branches (subfamilies) of a phylogenetic tree. Here, we show that the conductance mechanisms in two subfamilies differ with respect to involvement of the homolog of the proton donor in rhodopsin pumps. Two BCCRs from the genus Rhodomonas generate photocurrents that rapidly desensitize under continuous illumination. Using a combination of patch clamp electrophysiology, absorption, Raman spectroscopy, and flash photolysis, we found that the desensitization is due to rapid accumulation of a long-lived nonconducting intermediate of the photocycle with unusually blue-shifted absorption with a maximum at 330 nm. These observations reveal diversity within the BCCR family and contribute to deeper understanding of their independently evolved cation channel function.

IMPORTANCE Cation channelrhodopsins, light-gated channels from flagellate green algae, are extensively used as optogenetic photoactivators of neurons in research and recently have progressed to clinical trials for vision restoration. However, the molecular mechanisms of their photoactivation remain poorly understood. We recently identified cryptophyte cation channelrhodopsins, structurally different from those of green algae, which have separately evolved to converge on light-gated cation conductance. This study reveals diversity within this new protein family and describes a subclade with unusually rapid desensitization that results in short transient photocurrents in continuous light. Such transient currents have not been observed in the green algae channelrhodopsins and are potentially useful in optogenetic protocols. Kinetic UV-visible (UV-vis) spectroscopy and photoelectrophysiology reveal that the desensitization is caused by rapid accumulation of a nonconductive photointermediate in the photochemical reaction cycle. The absorption maximum of the intermediate is 330 nm, the shortest wavelength reported in any rhodopsin, indicating a novel chromophore structure.

In plants, water use efficiency (WUE) is a complex trait arising from numerous physiological and developmental characteristics. Here, we investigated the involvement of circadian regulation in long-term WUE in Arabidopsis (Arabidopsis thaliana) under light and dark conditions. Circadian rhythms are generated by the circadian oscillator, which provides a cellular measure of the time of day. In plants, the circadian oscillator contributes to the regulation of many aspects of physiology, including stomatal opening, rate of photosynthesis, carbohydrate metabolism, and developmental processes such as the initiation of flowering. We investigated the impact of the misregulation of numerous genes encoding various components of the circadian oscillator on whole plant, long-term WUE. From this analysis, we identified a role for the circadian oscillator in WUE. It appears that the circadian clock contributes to the control of transpiration and biomass accumulation. We also established that the circadian oscillator within guard cells can contribute to long-term WUE. Our experiments indicate that knowledge of circadian regulation will be important for developing crops with improved WUE.

The selection and firing of DNA replication origins play key roles in ensuring that eukaryotes accurately replicate their genomes. This process is not well documented in plants due in large measure to difficulties in working with plant systems. We developed a new functional assay to label and map very early replicating loci that must, by definition, include at least a subset of replication origins. Arabidopsis (Arabidopsis thaliana) cells were briefly labeled with 5-ethynyl-2'-deoxy-uridine, and nuclei were subjected to two-parameter flow sorting. We identified more than 5500 loci as initiation regions (IRs), the first regions to replicate in very early S phase. These were classified as strong or weak IRs based on the strength of their replication signals. Strong initiation regions were evenly spaced along chromosomal arms and depleted in centromeres, while weak initiation regions were enriched in centromeric regions. IRs are AT-rich sequences flanked by more GC-rich regions and located predominantly in intergenic regions. Nuclease sensitivity assays indicated that IRs are associated with accessible chromatin. Based on these observations, initiation of plant DNA replication shows some similarity to, but is also distinct from, initiation in other well-studied eukaryotic systems.

Photorespiration is an essential process in oxygenic photosynthetic organisms triggered by the oxygenase activity of Rubisco. In peroxisomes, photorespiratory HYDROXYPYRUVATE REDUCTASE1 (HPR1) catalyzes the conversion of hydroxypyruvate to glycerate together with the oxidation of a pyridine nucleotide cofactor. HPR1 regulation remains poorly understood; however, HPR1 phosphorylation at T335 has been reported. By comparing the kinetic properties of phosphomimetic (T335D), nonphosphorylatable (T335A), and wild-type recombinant Arabidopsis (Arabidopsis thaliana) HPR1, it was found that HPR1-T335D exhibits reduced NADH-dependent hydroxypyruvate reductase activity while showing improved NADPH-dependent activity. Complementation of the Arabidopsis hpr1-1 mutant by either wild-type HPR1 or HPR1-T335A fully complemented the photorespiratory growth phenotype of hpr1-1 in ambient air, whereas HPR1-T335D-containing hpr1-1 plants remained smaller and had lower photosynthetic CO₂ assimilation rates. Metabolite analyses indicated that these phenotypes were associated with subtle perturbations in the photorespiratory cycle of HPR1-T335D-complemented hpr1-1 rosettes compared to all other HPR1-containing lines. Therefore, T335 phosphorylation may play a role in the regulation of HPR1 activity in planta, although it was not required for growth under ambient air controlled conditions. Furthermore, improved NADP-dependent HPR1 activities in peroxisomes could not compensate for the reduced NADH-dependent HPR1 activity.

Phosphatidylcholine and phosphatidylethanolamine are two major phospholipid classes in eukaryotes. Each biosynthesis pathway starts with the phosphorylation of choline (Cho) or ethanolamine (Etn) catalyzed by either choline or ethanolamine kinase (CEK). Arabidopsis contains four CEK isoforms, but their isozyme-specific roles in metabolism and development are poorly described. Here, we showed that these four CEKs have distinct substrate specificities in vitro. While CEK1 and CEK2 showed substrate preference for Cho over Etn, CEK3 and CEK4 had clear substrate specificity for Cho and Etn, respectively. In vivo, CEK1, CEK2, and CEK3 exhibited kinase activity for Cho but not Etn, although the latter two isoforms showed rather minor contributions to total Cho kinase activity in both shoots and roots. The knockout mutants of CEK2 and CEK3 both affected root growth, and these isoforms had nonoverlapping cell-type-specific expression patterns in the root meristematic zone. In-depth phenotype analysis, as well as chemical and genetic complementation, revealed that CEK3, a Cho-specific kinase, is involved in cell elongation during root development. Phylogenetic analysis of CEK orthologs in Brassicaceae species showed evolutionary divergence between Etn kinases and Cho kinases. Collectively, our results demonstrate the distinct roles of the four CEK isoforms in Cho/Etn metabolism and plant development.

Objective

To investigate the frequency of levodopa-induced dyskinesia in dementia with Lewy bodies (DLBs) and Parkinson disease with dementia (PDD) and compare these frequencies with patients with incident Parkinson disease (PD) through a population-based cohort study.

In plant–pathogen relations, disease symptoms arise from the interaction of the host and pathogen genomes. Host–pathogen functional gene interactions are well described, whereas little is known about how the pathogen genetic variation modulates both organisms’ transcriptomes. To model and generate hypotheses on a generalist pathogen control of gene expression regulation, we used the Arabidopsis thaliana–Botrytis cinerea pathosystem and the genetic diversity of a collection of 96 B. cinerea isolates. We performed expression-based genome-wide association (eGWA) for each of 23,947 measurable transcripts in Arabidopsis (host), and 9267 measurable transcripts in B. cinerea (pathogen). Unlike other eGWA studies, we detected a relative absence of locally acting expression quantitative trait loci (cis-eQTL), partly caused by structural variants and allelic heterogeneity hindering their identification. This study identified several distantly acting trans-eQTL linked to eQTL hotspots dispersed across Botrytis genome that altered only Botrytis transcripts, only Arabidopsis transcripts, or transcripts from both species. Gene membership in the trans-eQTL hotspots suggests links between gene expression regulation and both known and novel virulence mechanisms in this pathosystem. Genes annotated to these hotspots provide potential targets for blocking manipulation of the host response by this ubiquitous generalist necrotrophic pathogen.

The most fundamental genetic program of an annual plant defines when to grow and reproduce and when to remain dormant in the soil as a seed. With the right timing, plants can even live in hostile regions with only a few months of growth-favorable abundant rains and mild temperatures. To...

Arrestin-1 is the arrestin family member responsible for inactivation of the G protein–coupled receptor rhodopsin in photoreceptors. Arrestin-1 is also well-known to interact with additional protein partners and to affect other signaling cascades beyond phototransduction. In this study, we investigated one of these alternative arrestin-1 binding partners, the glycolysis enzyme enolase-1, to map the molecular contact sites between these two proteins and investigate how the binding of arrestin-1 affects the catalytic activity of enolase-1. Using fluorescence quench protection of strategically placed fluorophores on the arrestin-1 surface, we observed that arrestin-1 primarily engages enolase-1 along a surface that is opposite of the side of arrestin-1 that binds photoactivated rhodopsin. Using this information, we developed a molecular model of the arrestin-1–enolase-1 complex, which was validated by targeted substitutions of charge-pair interactions. Finally, we identified the likely source of arrestin's modulation of enolase-1 catalysis, showing that selective substitution of two amino acids in arrestin-1 can completely remove its effect on enolase-1 activity while still remaining bound to enolase-1. These findings open up opportunities for examining the functional effects of arrestin-1 on enolase-1 activity in photoreceptors and their surrounding cells.

In Arabidopsis, LTR retrotransposons are activated by mutations in the chromatin gene DECREASE in DNA METHYLATION 1 (DDM1), giving rise to 21- to 22-nt epigenetically activated siRNA (easiRNA) that depend on RNA DEPENDENT RNA POLYMERASE 6 (RDR6). We purified virus-like particles (VLPs) from ddm1 and ddm1rdr6 mutants in which genomic RNA is reverse transcribed into complementary DNA. High-throughput short-read and long-read sequencing of VLP DNA (VLP DNA-seq) revealed a comprehensive catalog of active LTR retrotransposons without the need for mapping transposition, as well as independent of genomic copy number. Linear replication intermediates of the functionally intact COPIA element EVADE revealed multiple central polypurine tracts (cPPTs), a feature shared with HIV in which cPPTs promote nuclear localization. For one member of the ATCOPIA52 subfamily (SISYPHUS), cPPT intermediates were not observed, but abundant circular DNA indicated transposon "suicide" by auto-integration within the VLP. easiRNA targeted EVADE genomic RNA, polysome association of GYPSY (ATHILA) subgenomic RNA, and transcription via histone H3 lysine-9 dimethylation. VLP DNA-seq provides a comprehensive landscape of LTR retrotransposons and their control at transcriptional, post-transcriptional, and reverse transcriptional levels.

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.

The world according to two of the scene’s most dedicated rave architects. Gabber Eleganza and HDMIRROR make a formidable duo on their new collaborative track ‘Frozen Dopamina’, which arrives with a video capturing the world at its most euphoric. The track is taken from The Real Life, a new collaborative release from the two producers […]

The post Gabber Eleganza & HDMIRROR chase euphoria on ‘Frozen Dopamina’ appeared first on FACT Magazine.

A ridiculously titled film about a couple who stumble upon a stash of money is absurd and cliched but mostly entertaining

One of the most surprising reveals of last October’s unprecedented Netflix data dump was the astounding popularity of cheap psycho-thriller Secret Obsession. While the streamer proudly touted new films from Alfonso Cuarón, Paul Greengrass and the Coens in the same period, it was a no-star, dim-plotted slab of schlock that netted more viewers, with an estimated 40m households eager to find out just how secret that obsession really was. Modelled after a Lifetime TV movie (with a Lifetime TV director at the helm), it was an important victory for Netflix because it revealed a substantial audience for tiny-budgeted thrillers with generic titles, a bracket they could easily fill at little expense.

Related: The Half of It review – charming Netflix teen comedy takes on Cyrano

While COVID-19 stymies travel, help conserve those things—from cacti to manta rays—that will beckon you later

Shareholder vote in favour of global mining giant adopting binding targets grew sixfold since last year

Shareholders in global miner Rio Tinto have rebuked the company over its climate stance, with 37% voting at a meeting in Australia for a resolution that would require it to set binding emissions targets.

While the resolution did not pass, its sponsor, environmental group Market Forces, said it attracted six times as much support as an identical one put up at the same meeting last year.

Magnolia Earl is making history.

The pharmaceutical analysis firm is continuing its contract analytical laboratory services running, with changes designed to keep people and products safe.

Following meetings with then-Commissioner Scott Gottlieb and senior leadership from the Center for Drug Evaluation and Research on the role of CROs and technology companies in designing and implementing risk-based monitoring (RBM) of clinical trials, ACRO this week submitted extensive comments on recent FDA Guidance.Increasing the use of innovative RBM technologies helps make clinical trials safer, more efficient and higher quality. ACRO’s comments offer unique insights into the recent expansion of RBM implementation and call for further increasing the use of these oversight technologies.

On July 17, 2019, under cooperative agreement with the FDA, the Duke-Margolis Center for Health Policy (Duke Margolis) held a public workshop. The event, titled Improving the Implementation of Risk-Based Monitoring Approaches of Clinical Investigations, aimed to identify opportunities to improve Risk Based Monitoring (RBM) implementation and solicit stakeholder input on the challenges, barriers, and enablers that impact the successful adoption of RBM.

At the eighth annual International Competition Network (ICN) conference in Zurich, Switzerland, the ICN adopted new Recommended Practices for substantive merger analysis and presented two new reports on the analysis of tying and bundled discounting and loyalty discounts and rebates under unilateral conduct laws.

Four current and former employees of International Adoption Guides Inc. (IAG), an adoption services provider, have been indicted by a grand jury in South Carolina for allegedly conspiring to defraud the United States in connection with IAG’s adoption services in Ethiopia.

The International Competition Network (ICN) adopted new recommended practices for predatory pricing analysis and competition assessment, and approved new work product on international merger enforcement cooperation, confidentiality protections during investigations, leniency policy and digital evidence gathering.

The Justice Department announced today that it reached a settlement with the Delran Township School District in New Jersey under Title II of the Americans with Disabilities Act (ADA).

A former foreign program director of International Adoption Guides Inc. (IAG), an adoption agency, pleaded guilty today to conspiring with others to defraud the United States by paying bribes to foreign officials and submitting fraudulent documents to the State Department for adoptions from Ethiopia

ExRobotics B.V., a Netherlands-based developer of robotics technology for hazardous environments, and Yokogawa Electric Corporation (TOKYO: 6841), a global provider of industrial automation, control, and measurement technology, announce the signing of a licensing agreement that will enable Yokogawa to sell and deploy ExRobotics' inspection robot hardware and software platforms worldwide.

Naturally, official Nordic eating guidelines include things like: "Eat more food from wild landscapes."

In Japan, celebrating the transient beauty of flowers is a beloved custom when the cherry blossoms spring to life.

Here's what happens when kind humans and open-armed owls encounter an orphaned owlet.

Environmentalists and Urban Planners on the run as smart growth and sustainability become illegal in the State.

The largest grocery chain in the US will develop and implement a new plan to improve its protection of tropical forests.

The SolarMill, a 1.2 kW combination wind and solar energy system, will be sold in the U.S. for about $3000.