Hong Kong has seen 57 new infections over the past two weeks, 50 of which were imported.

A chronology of key events

Key facts, figures and dates

Air passengers arriving in Britain will soon have to quarantine for a fortnight as part of a move to avoid a second peak of the coronavirus.

Garoppolo was forced to leave the game against the Chiefs after taking a hit in the fourth quarter.

We’ve previously taken a look at the notable differences between PayPal and Stripe, although in this tutorial we’ll be focusing on the up and coming Square Payment Gateway and how it compares with Stripe. While both Square and Stripe share some similarities such as their branding and names, they each offer features which suit two […]

The post Stripe vs Square appeared first on Tips and Tricks HQ.

Dune HD announces a new partnership with Qarva designed to enhance the IPTV experience. The integration of Qarva’s FastSwitch technology into Dune HD’s digital media players and set-top boxes will give IPTV subscribers improved interaction and higher quality through faster channel changing and the elimination of packet loss. The joint solution will be demonstrated by Dune HD on stand 17 at TV Connect MENA 2012.

An enhanced, high quality experience is proven to increase subscriber loyalty and is central to operators reducing churn and growing revenues. FastSwitch improves the viewing experience by dramatically reducing the lag associated with controlling IPTV services, bringing response times down from 5 seconds to less than half a second - in line with the speeds achieved through traditional TV broadcast channels. Through its integral Packet Loss Recovery technology, FastSwitch also eliminates IPTV issues such as picture freezing and blocking, delivering an improved viewing performance.

Qatar Telecom has selected Mariner's IP video service oriented monitoring solution, Mariner xVu. The latest version of Mariner xVu is specifically designed for integration with IPTV probes. Qtel will use Mariner xVu for the Mozaic TV service, making this the first Mariner xVu deployment in the Middle East.

Alfalak Electronic Equipment & Supplies Co., partnered with Mariner to deploy xVu. Through easy integration with network probes — at the head-end and/or individual network element — Mariner xVu offers Qtel additional insights into the IPTV network by extending video service monitoring reach to each subscriber, allowing the operator to maintain the highest possible video quality while simultaneously reducing operating expenses. Statistics collected by external data sources such as probes are compiled and configured as status indicators on Mariner NetworkVu to enable a deeper understanding of IPTV traffic and customer experience issues. The probe enhancement is now a configurable option of NetworkVu, rather than a custom development, and was created based on service provider requests for integration with external data sources.

strataconf: Big data vs big reality http://t.co/D751jk0ntb Data itself has no quality. It’s what you do with it that counts

Optimized for Kubernetes, Quarkus is designed to help you create Java applications that are cloud first, container native, and serverless capable. With this cookbook, authors Alex Soto Bueno and Jason Porter from Red Hat provide detailed solutions for installing, interacting with, and using Quarkus in the development and production of microservices. The recipes in this book show mid-level to senior developers familiar with Java enterprise application development how to get started with Quarkus quickly.

You have to invest real time into earning links from high-authority sites by doing your own research and digital public relations.

Please visit Search Engine Land for the full article.

velocityconf: New #velocityconf CA program preview is up: http://t.co/rKjf91RXdD @ariyahidayat on End-to-End JS Quality Analysis.

Many homeowners have built up wealth in their homes. Owners’ balance sheets remained strong in the first quarter across the U.S., a new report shows.

Travel Photography (interview with Chris Marquardt)

Some House Democrats have decided that the COVID-19 pandemic is an appropriate time to implement a key plank of the campaign of former Democratic presidential candidate Sen. Bernie Sanders of Vermont. Reps. Ilhan Omar of Minnesota, Rashida Tlaib of Michigan, Alexandria Ocasio-Cortez of New York and Ayanna Pressley of Massachusetts — who make up the…

The post ‘The Squad’ Pushes for Huge Student Loan Cancellation in Next Relief Bill appeared first on The Western Journal.

“Outbreaks have sparked riots and propelled public-health innovations, prefigured revolutions and redrawn maps.” – The New Yorker, April 2020 “Nothing will be the same.”  That’s the overwhelming takeaway I’ve heard from dozens of conversations I’ve had with C-suite leaders, physicians, policy experts and media professionals these past few weeks.  When it comes to the business … Continue reading "An Open Letter To American Corporations: It’s Good Business (and Smart Marketing) To Support Quality Journalism"

Work(out) From Home is a weekly column where we review smart fitness machines and apps in the wake of the coronavirus outbreak. Thanks to technology, there are still plenty of ways to exercise if your gym is closed. Read more...

A couple of days ago, Thomas Dolby posted this video to Twitter and YouTube of a track called "Corona and the Pirate Twins," a spoof of his 1982 hit, "Europa and the Pirate Twins." The song is credited to Dolby Kids. Thomas included the following note:

"This is what my mischievous offspring have been getting up to during the Lockdown."

Here is the original video for "Europa..."

Bonus track:

And here is Thomas Dolby doing a touching home solo version of his achingly beautiful "Screen Kiss" from 1984's Flat Earth. He did it as a tribute to Matthew Seligman, the celebrated bassist who recently died of COVID-19. Seligman played bass on Dolby's recordings, including Flat Earth, and also played for Bowie, Robyn Hitchcock, Peter Murphy, and countless others. He was also a member of the Soft Boys.

Image: YouTube Read the rest

A family in lockdown performs the Beatles' "Come Together." Read the rest

My pal Jake has been taking regular "cigar walks" (as he calls them) here in our lovely island city of Alameda, California. On those walks, he started spotting some creative flyers...

(I saved the best two for last...)

photos by Jake Schaffer, used with permission

Thanks, Susie! Read the rest

A beverage company in the U.S. is inviting moms to let out a ‘quaranscream’ this Mother’s Day on a designated ‘zero-judgement venting hotline’ for a chance to win its wine spritzers.

Telomeres are specific nucleoprotein structures that are located at the ends of linear eukaryotic chromosomes and play crucial roles in genomic stability. Telomere DNA consists of simple repeats of a short G-rich sequence: TTAGGG in mammals and TTTAGGG in most plants. In recent years, the mammalian telomeric G-rich repeats have been shown to form G-quadruplex (G4) structures, which are crucial for modulating telomere functions. Surprisingly, even though plant telomeres are essential for plant growth, development, and environmental adaptions, only few reports exist on plant telomeric G4 DNA (pTG4). Here, using bulk and single-molecule assays, including CD spectroscopy, and single-molecule FRET approaches, we comprehensively characterized the structure and dynamics of a typical plant telomeric sequence, d[GGG(TTTAGGG)3]. We found that this sequence can fold into mixed G4s in potassium, including parallel and antiparallel structures. We also directly detected intermediate dynamic transitions, including G-hairpin, parallel G-triplex, and antiparallel G-triplex structures. Moreover, we observed that pTG4 is unfolded by the AtRecQ2 helicase but not by AtRecQ3. The results of our work shed light on our understanding about the existence, topological structures, stability, intermediates, unwinding, and functions of pTG4.

Pierre Lairez
J. Amer. Math. Soc. 33 (2019), 487-526.
Abstract, references and article information

Alfred C. O. Vertegaal
Dec 1, 2006; 5:2298-2310
Research

Roland Bruderer
May 1, 2015; 14:1400-1410
Research

Amelia C. Peterson
Nov 1, 2012; 11:1475-1488
Technological Innovation and Resources

Hasmik Keshishian
Dec 1, 2007; 6:2212-2229
Research

Sebastian A. Wagner
Oct 1, 2011; 10:M111.013284-M111.013284
Research

Joris J. Benschop
Jul 1, 2007; 6:1198-1214
Research

William M. Old
Oct 1, 2005; 4:1487-1502
Research

Leigh Anderson
Apr 1, 2006; 5:573-588
Research

Albrecht Gruhler
Mar 1, 2005; 4:310-327
Research

Jeffrey C. Silva
Jan 1, 2006; 5:144-156
Research

Philip L. Ross
Dec 1, 2004; 3:1154-1169
Research

Jürgen Cox
Sep 1, 2014; 13:2513-2526
Technological Innovation and Resources

The CRISPR/Cas9 nucleases have been widely applied for genome editing in various organisms. Cas9 nucleases complexed with a guide RNA (Cas9–gRNA) find their targets by scanning and interrogating the genomic DNA for sequences complementary to the gRNA. Recognition of the DNA target sequence requires a short protospacer adjacent motif (PAM) located outside this sequence. Given that the efficiency of target location may depend on the strength of interactions that promote target recognition, here we sought to compare affinities of different Cas9 nucleases for their cognate PAM sequences. To this end, we measured affinities of Cas9 nucleases from Streptococcus pyogenes, Staphylococcus aureus, and Francisella novicida complexed with guide RNAs (gRNAs) (SpCas9–gRNA, SaCas9–gRNA, and FnCas9–gRNA, respectively) and of three engineered SpCas9–gRNA variants with altered PAM specificities for short, PAM-containing DNA probes. We used a “beacon” assay that measures the relative affinities of DNA probes by determining their ability to competitively affect the rate of Cas9–gRNA binding to fluorescently labeled target DNA derivatives called “Cas9 beacons.” We observed significant differences in the affinities for cognate PAM sequences among the studied Cas9 enzymes. The relative affinities of SpCas9–gRNA and its engineered variants for canonical and suboptimal PAMs correlated with previous findings on the efficiency of these PAM sequences in genome editing. These findings suggest that high affinity of a Cas9 nuclease for its cognate PAM promotes higher genome-editing efficiency.

Research Event

Invitation Only Research Event

RK Tangirala
Nov 1, 1995; 36:2320-2328
Articles

18 December 2019

Research Event

7 May 2020

Laser-capture microdissection (LCM) allows the visualization and isolation of morphologically distinct subpopulations of cells from heterogeneous tissue specimens. In combination with formalin-fixed and paraffin-embedded (FFPE) tissue it provides a powerful tool for retrospective and clinically relevant studies of tissue proteins in a healthy and diseased context. We first optimized the protocol for efficient LCM analysis of FFPE tissue specimens. The use of SDS containing extraction buffer in combination with the single-pot solid-phase-enhanced sample preparation (SP3) digest method gave the best results regarding protein yield and protein/peptide identifications. Microdissected FFPE human substantia nigra tissue samples (~3,000 cells) were then analyzed, using tandem mass tag (TMT) labeling and LC-MS/MS, resulting in the quantification of >5,600 protein groups. Nigral proteins were classified and analyzed by abundance, showing an enrichment of extracellular exosome and neuron-specific gene ontology (GO) terms among the higher abundance proteins. Comparison of microdissected samples with intact tissue sections, using a label-free shotgun approach, revealed an enrichment of neuronal cell type markers, such as tyrosine hydroxylase and alpha-synuclein, as well as proteins annotated with neuron-specific GO terms. Overall, this study provides a detailed protocol for laser-capture proteomics using FFPE tissue and demonstrates the efficiency of LCM analysis of distinct cell subpopulations for proteomic analysis using low sample amounts.

Mass spectrometry (MS)-based proteomics has great potential for overcoming the limitations of antibody-based immunoassays for antibody-independent, comprehensive, and quantitative proteomic analysis of single cells. Indeed, recent advances in nanoscale sample preparation have enabled effective processing of single cells. In particular, the concept of using boosting/carrier channels in isobaric labeling to increase the sensitivity in MS detection has also been increasingly used for quantitative proteomic analysis of small-sized samples including single cells. However, the full potential of such boosting/carrier approaches has not been significantly explored, nor has the resulting quantitation quality been carefully evaluated. Herein, we have further evaluated and optimized our recent boosting to amplify signal with isobaric labeling (BASIL) approach, originally developed for quantifying phosphorylation in small number of cells, for highly effective analysis of proteins in single cells. This improved BASIL (iBASIL) approach enables reliable quantitative single-cell proteomics analysis with greater proteome coverage by carefully controlling the boosting-to-sample ratio (e.g. in general <100x) and optimizing MS automatic gain control (AGC) and ion injection time settings in MS/MS analysis (e.g. 5E5 and 300 ms, respectively, which is significantly higher than that used in typical bulk analysis). By coupling with a nanodroplet-based single cell preparation (nanoPOTS) platform, iBASIL enabled identification of ~2500 proteins and precise quantification of ~1500 proteins in the analysis of 104 FACS-isolated single cells, with the resulting protein profiles robustly clustering the cells from three different acute myeloid leukemia cell lines. This study highlights the importance of carefully evaluating and optimizing the boosting ratios and MS data acquisition conditions for achieving robust, comprehensive proteomic analysis of single cells.

Telomeres are specific nucleoprotein structures that are located at the ends of linear eukaryotic chromosomes and play crucial roles in genomic stability. Telomere DNA consists of simple repeats of a short G-rich sequence: TTAGGG in mammals and TTTAGGG in most plants. In recent years, the mammalian telomeric G-rich repeats have been shown to form G-quadruplex (G4) structures, which are crucial for modulating telomere functions. Surprisingly, even though plant telomeres are essential for plant growth, development, and environmental adaptions, only few reports exist on plant telomeric G4 DNA (pTG4). Here, using bulk and single-molecule assays, including CD spectroscopy, and single-molecule FRET approaches, we comprehensively characterized the structure and dynamics of a typical plant telomeric sequence, d[GGG(TTTAGGG)3]. We found that this sequence can fold into mixed G4s in potassium, including parallel and antiparallel structures. We also directly detected intermediate dynamic transitions, including G-hairpin, parallel G-triplex, and antiparallel G-triplex structures. Moreover, we observed that pTG4 is unfolded by the AtRecQ2 helicase but not by AtRecQ3. The results of our work shed light on our understanding about the existence, topological structures, stability, intermediates, unwinding, and functions of pTG4.