Jungang Li, Guozhen Lu and Qiaohua Yang
Trans. Amer. Math. Soc. 373 (2020), 3483-3513.
Abstract, references and article information

Jiangxue Fang
Trans. Amer. Math. Soc. 373 (2020), 3445-3481.
Abstract, references and article information

M. V. Pratsiovytyi and S. P. Ratushniak
Theor. Probability and Math. Statist. 99 (2020), 211-228.
Abstract, references and article information

M. M. Kapustei and P. V. Slyusarchuk
Theor. Probability and Math. Statist. 99 (2020), 101-111.
Abstract, references and article information

N. Kuznetsov
St. Petersburg Math. J. 31 (2020), 521-531.
Abstract, references and article information

A. Ilyin and A. Laptev
St. Petersburg Math. J. 31 (2020), 479-493.
Abstract, references and article information

Mohamed Jleli, Bessem Samet and Philippe Souplet
Proc. Amer. Math. Soc. 148 (2020), 2579-2593.
Abstract, references and article information

Alberto Arenas, Óscar Ciaurri and Edgar Labarga
Proc. Amer. Math. Soc. 148 (2020), 2539-2550.
Abstract, references and article information

Michiya Mori
Proc. Amer. Math. Soc. 148 (2020), 2477-2485.
Abstract, references and article information

Igor E. Shparlinski
Proc. Amer. Math. Soc. 148 (2020), 2371-2377.
Abstract, references and article information

Marcelo Fiore and Vladimir Voevodsky
Proc. Amer. Math. Soc. 148 (2020), 2297-2315.
Abstract, references and article information

The Leisure & Cultural Services Department launched a one-stop online resources centre today for the public to view or participate in multi-faceted leisure and cultural activities from the comfort of their homes.

The online resources centre offers demonstrations of home exercises as well as videos of exercise demonstrations and Healthy Exercise for All Campaign interactive games.

The information portal carries knowledge on the plants and animals at the Zoological & Botanical Gardens, old and valuable trees at the department's major parks and colourful Hong Kong Flower Show archives.

The Museum of Art and the Heritage Museum are collaborating with the Google Arts & Culture Project to showcase exhibits in a digital format.

There are also virtual exhibitions that explore previous fascinating collections at the History Museum and the Science Museum.

While extensive content from intangible cultural heritage and modern arts integrating into life from Oi! is also included.

The Hong Kong Public Libraries offers vast e-resources allowing people to explore fun reading at home.

On the performing arts front, digital content covers concert archives from the Hong Kong Philharmonic Orchestra, Hong Kong Chinese Orchestra and Hong Kong Sinfonietta.

Applications for the $1.3 billion in subsidies earmarked for registered owners of goods vehicles and green minibus operators under the Anti-epidemic Fund opened today, the Transport Department announced.

A one-off non-accountable subsidy of $10,000 will be provided to each registered goods vehicle owner for each goods vehicle.

From today until September 30, registered owners of goods vehicles who have received the department's letters must use the registration PIN provided in the letters for submission of registrations through GovHK.

After successful completion of registration, the subsidy will be disbursed to the designated local bank account provided in the registration through autopay in about two to three weeks.

Cross-boundary goods vehicle drivers who conduct nucleic acid tests in Hong Kong can apply for the subsidy on an accountable basis, with the maximum amount being $350 per test.

A one-off non-accountable subsidy of $30,000 per green minibus will be provided to each holder of a Passenger Service Licence-Public Light Bus (Scheduled) Service who has been approved to operate a relevant green minibus route package.

The department briefed the green minibus trade today on the subsidy arrangement and application details with the distribution of the application forms.

Green minibus operators are required to send the completed application forms to the department by post on or before September 30.

After the department has verified their submissions, the subsidy will be disbursed through autopay in about one month.

To assist the transport trades to cope with operational demands in the prevailing economic environment, the Government has rolled out the fuel subsidy and one-off subsidy measures under the first round of the Anti-epidemic Fund progressively.

As of mid-April, the department has received applications for subsidies from three franchised bus companies, 10 franchised and licensed ferry operators, Hong Kong Tramways Limited, registrations from 1,700 registered owners of non-franchised public buses, school private light buses and hire cars. Over $100 million of the subsidies have been disbursed.

Click here for details.

Janine Freeman
Jul 1, 2004; 17:137-140
Nutrition FYI

Peggy Yarborough
Jan 1, 2003; 16:
Case Studies

Geralyn Spollett
Jan 1, 2003; 16:
Case Studies

The Commerce & Economic Development Bureau today announced that the subsidy quota for three mask production lines have been reassigned.

Three production lines, previously approved under the Local Mask Production Subsidy Scheme, have withdrawn from the scheme, the Government said.

The subsidy quota concerned has been allocated to SDL Skin (Asia), Safeguard HK and SwissTech.

SDL Skin (Asia) has been approved for obtaining a subsidy for a second production line and is expected to supply an average of 1.6 million masks every month to the Government. The production line may receive a subsidy of up to $1 million.

Safeguard HK has been approved for obtaining a subsidy for one production line and is expected to supply an average of 500,000 masks to the Government every month. The production line may receive up to $2 million.

SwissTech has been approved for obtaining a subsidy for one production line and is expected to supply an average of 2 million masks every month to the Government and produce a further 1 million masks on average monthly for the local market.

The production line may receive up to $3 million.

It is estimated that when all 20 subsidised lines under the scheme are in full production, they will collectively supply 33.85 million masks to the Government and a further 7.15 million to the local market monthly.

The companies which withdrew from the scheme were CareHK and Shang Manufactory.

The Government did not sign agreements with or make disbursements to these firms.

The winners were revealed at a glitzy party in Shoreditch on 22 February

About $31 million in funding has been given to support 79 projects under the special round of the Public Policy Research (PPR) Funding Scheme, the Government announced today.

A total of 210 applications were received for the special round, which was launched last November to fund local research institutions and think tanks to research topics relating to the underlying causes of the social incidents that took place in the second half of 2019.

The research may also cover important political, economic, cultural and societal issues relating to deep-seated problems of society.

Assessment of the applications received under the special round was conducted by the independent assessment panel chaired by and comprising experienced academics.

The research quality of the proposal and relevance to the themes of the special round were the principal assessment criteria, with consideration given to factors such as whether the research proposal was solution-oriented, feasible and practical, whether the methodology was reasonable and sound, the applicant’s capability and whether the proposed budget was cost-effective. 

The assessment panel took a holistic view on each research proposal, reached a collective decision and made recommendations, the Policy Innovation & Co-ordination Office said, adding that a declaration of interest system was in place to ensure the assessments were fair and impartial.

In general, a sum of up to $500,000 has been granted to each approved project under the special round.

The approved projects have commenced progressively and are expected to be completed by the end of the year, with the first batch to be completed in late September to early October.

Click here for details of the funded projects.

(Johannes Gutenberg Universitaet Mainz) Scientists at Johannes Gutenberg University Mainz (JGU) and the Helmholtz Institute Mainz (HIM) in Germany have presented a non-contact method for detecting the state of charge and any defects in lithium-ion batteries.

"[W]hen the editors at Quanta Magazine invited me to host a podcast for them, I jumped at the chance...Through this podcast, I've been learning about the inner lives of some of the most intriguing mathematicians and scientists working today. [I]n every case, I wanted to know what makes them tick. I wanted to know why they do what they do, what they’ve discovered, and why it matters to them and to the world." Read "Why I'm Hosting The Joy of x Podcast," by Steven Strogatz, Quanta Magazine, January 14, 2020.

Neoantimycins are anticancer compounds of 15-membered ring antimycin-type depsipeptides. They are biosynthesized by a hybrid multimodular protein complex of nonribosomal peptide synthetase (NRPS) and polyketide synthase (PKS), typically from the starting precursor 3-formamidosalicylate. Examining fermentation extracts of Streptomyces conglobatus, here we discovered four new neoantimycin analogs, unantimycins B–E, in which 3-formamidosalicylates are replaced by an unusual 3-hydroxybenzoate (3-HBA) moiety. Unantimycins B–E exhibited levels of anticancer activities similar to those of the chemotherapeutic drug cisplatin in human lung cancer, colorectal cancer, and melanoma cells. Notably, they mostly displayed no significant toxicity toward noncancerous cells, unlike the serious toxicities generally reported for antimycin-type natural products. Using site-directed mutagenesis and heterologous expression, we found that unantimycin productions are correlated with the activity of a chorismatase homolog, the nat-hyg5 gene, from a type I PKS gene cluster. Biochemical analysis confirmed that the catalytic activity of Nat-hyg5 generates 3-HBA from chorismate. Finally, we achieved selective production of unantimycins B and C by engineering a chassis host. On the basis of these findings, we propose that unantimycin biosynthesis is directed by the neoantimycin-producing NRPS–PKS complex and initiated with the starter unit of 3-HBA. The elucidation of the biosynthetic unantimycin pathway reported here paves the way to improve the yield of these compounds for evaluation in oncotherapeutic applications.

Aldehyde oxidases (AOXs) are a small group of enzymes belonging to the larger family of molybdo-flavoenzymes, along with the well-characterized xanthine oxidoreductase. The two major types of reactions that are catalyzed by AOXs are the hydroxylation of heterocycles and the oxidation of aldehydes to their corresponding carboxylic acids. Different animal species have different complements of AOX genes. The two extremes are represented in humans and rodents; whereas the human genome contains a single active gene (AOX1), those of rodents, such as mice, are endowed with four genes (Aox1-4), clustering on the same chromosome, each encoding a functionally distinct AOX enzyme. It still remains enigmatic why some species have numerous AOX enzymes, whereas others harbor only one functional enzyme. At present, little is known about the physiological relevance of AOX enzymes in humans and their additional forms in other mammals. These enzymes are expressed in the liver and play an important role in the metabolisms of drugs and other xenobiotics. In this review, we discuss the expression, tissue-specific roles, and substrate specificities of the different mammalian AOX enzymes and highlight insights into their physiological roles.

Inter-α-inhibitor is a proteoglycan essential for mammalian reproduction and also plays a less well-characterized role in inflammation. It comprises two homologous “heavy chains” (HC1 and HC2) covalently attached to chondroitin sulfate on the bikunin core protein. Before ovulation, HCs are transferred onto the polysaccharide hyaluronan (HA) to form covalent HC·HA complexes, thereby stabilizing an extracellular matrix around the oocyte required for fertilization. Additionally, such complexes form during inflammatory processes and mediate leukocyte adhesion in the synovial fluids of arthritis patients and protect against sepsis. Here using X-ray crystallography, we show that human HC1 has a structure similar to integrin β-chains, with a von Willebrand factor A domain containing a functional metal ion-dependent adhesion site (MIDAS) and an associated hybrid domain. A comparison of the WT protein and a variant with an impaired MIDAS (but otherwise structurally identical) by small-angle X-ray scattering and analytical ultracentrifugation revealed that HC1 self-associates in a cation-dependent manner, providing a mechanism for HC·HA cross-linking and matrix stabilization. Surprisingly, unlike integrins, HC1 interacted with RGD-containing ligands, such as fibronectin, vitronectin, and the latency-associated peptides of transforming growth factor β, in a MIDAS/cation-independent manner. However, HC1 utilizes its MIDAS motif to bind to and inhibit the cleavage of complement C3, and small-angle X-ray scattering–based modeling indicates that this occurs through the inhibition of the alternative pathway C3 convertase. These findings provide detailed structural and functional insights into HC1 as a regulator of innate immunity and further elucidate the role of HC·HA complexes in inflammation and ovulation.

VOLUME 295 (2020) PAGES 3285–3300An incorrect graph was used in Fig. 5C. This error has now been corrected. Additionally, some of the statistics reported in the legend and text referring to Fig. 5C were incorrect. The F statistics for Fig. 5C should state Fken(3,16) = 7.454, p < 0.01; FCCCP(1,16) = 102.9, p < 0.0001; Finteraction(3,16) = 7.480, p < 0.01. This correction does not affect the results or conclusions of this work.jbc;295/17/5835/F5F1F5Figure 5C.

(University of Cambridge) Parents should not feel pressured to make their young children undertake structured learning or achieve specific tasks, particularly during lockdown. A new study of children under the age of two has found that parents who take a more flexible approach to their child's learning can - for children who were easy babies - minimise behavioural problems during toddlerhood.

The Agriculture, Fisheries & Conservation Department (AFCD) and the Leisure & Cultural Services Department (LCSD) announced today that some of their facilities will be closed in light of the latest developments of COVID-19.

Country park barbecue sites and campsites of the AFCD will be closed from 6pm on March 28 for 14 days. There are 163 barbecue sites and 41 campsites under the management of the AFCD.

During the closure of these facilities, barbecue or camping activities in country parks will not be allowed and AFCD staff will step up patrols of the sites concerned and take appropriate action against any violation of relevant regulations.

Call 1823 for enquiries and visit the Enjoy Hiking website for updates on country park facilities.

As for LCSD facilities, its free outdoor leisure facilities will be closed from 6pm on March 28.

Other venues and facilities with services already suspended will continue to be closed until further notice.

All booking applications for the department's recreation and sports facilities, wedding venues, amphitheatres and non-fee charging leisure venues for non-designated use are also suspended.

Meanwhile, the Housing Authority will close its outdoor sports and recreational facilities from 6pm tomorrow until further notice.

The Government today said the first batch of subsidies amounting to $5.6 million under two relief measures for recyclers has been disbursed, while $5.6 million in subsidies had been approved under a management sector support scheme.

The two Recycling Fund measures aim to help the recycling industry cope with the current economic situation and recent operational difficulties arising from the COVID-19 epidemic.

The Advisory Committee on Recycling Fund announced in mid-March to reserve $100 million to launch the One-off Recycling Industry Anti-epidemic Scheme.

The scheme provides timely financial support to help with recyclers’ operational costs for six months. The funding limit for each recycler is $20,000 per month from January 1 to June 30, or $120,000 in total maximum subsidy.

The committee has also allocated additional funds to extend the earlier-launched One-off Rental Support Scheme for another six months, providing a total funding of $200 million to fight the virus and help the recycling industry ride out the difficult times.

The rental support scheme, which benefits street-corner recycling shops and recycling sites, originally ran from October to March. It has been extended for six months until September this year, totalling 12 months.

The monthly rental subsidy for each recycler is capped at $25,000, setting the maximum total rental subsidy at $300,000.

Separately, the Anti-epidemic Support Scheme for Property Management Sector has approved 205 applications involving around $5.6 million in subsidies to benefit more than 1,500 building blocks.

The relevant property management companies and owners’ organisations will receive notifications for subsidy disbursement shortly.

The list of properties for which applications have been approved is available online.

Briefing sessions were held earlier to introduce the scheme to the property management sector and owners’ organisations.

The Agriculture, Fisheries & Conservation Department (AFCD) announced today that country park barbecue sites and campsites will remain closed until April 23.

The 163 barbecue sites and 41 campsites managed by AFCD have been closed since March 28. Given the latest development of COVID-19, the department has decided to extend the closure.

During the closure of these facilities, no barbecuing or camping activities are allowed in country parks.

AFCD staff will step up patrols of these sites and violation of relevant regulations will be subject to prosecution.

Call 1823 for enquiries or visit the Enjoy Hiking website for updates.

The department also reminded people visiting country parks to maintain personal and environmental hygiene and maintain social distancing.

The Agriculture, Fisheries & Conservation Department (AFCD) today announced that its barbecue sites and campsites in country parks will be closed until May 7.

It made the decision in light of the latest development of the COVID-19 epidemic and to reduce social contact.

All of these sites have been closed since 6pm on March 28.

During the closure of these facilities, no one should carry out barbecuing or camping activities in country parks.

AFCD staff will step up patrols of the sites and violation of relevant regulations may be subject to prosecution.

In the past two weeks, AFCD took enforcement action against 34 people who carried out barbecuing or camping activities in country parks.

The department will continue to closely monitor the situation and review the arrangement as appropriate.

For the latest updates on facilities in country parks, visit the Enjoy Hiking website.

Stretching from Sai Kung on the east coast to Tuen Mun in the west, the whopping 100 km-long MacLehose Trail is the longest and first long-distance hiking trail in Hong Kong.

The trail is divided into 10 sections and traverses eight country parks which embrace magnificent natural scenery, interesting historical relics and a wide range of wild fauna and flora, winding past the coastline, rugged mountains, valleys and reservoirs to provide a diverse outdoor experience for hikers.

It was even named as one of the world's 20 dream trails by National Geographic.

A lot of hard work went into building the trail, with Agriculture, Fisheries & Conservation Department workers out in the elements without much shelter, often carrying heavy equipment uphill and downhill over varied terrain.

Building bonds

Wan Keung and Lai Hing joined the department around 40 years ago. They both took part in the MacLehose Trail project which was started in 1979 to promote hiking activities in Hong Kong.

The project was named after the then-Governor Sir Murray MacLehose - who was himself a keen walker - for his significant efforts to conserve Hong Kong’s countryside.

“I have contributed a lot to the trail. I am happy as it is packed with people now,” said Mr Wan.

While Mr Lai added: “We are going to retire, but the trail will be here for a long time.”

Despite working on the same project, the pair - now in their 60s - only met for the first time recently because they were assigned to different work stations back then. However, they became firm friends instantly.

From setting up the many signposts along the way, to hand-building the heavy stone steps, the two men eagerly shared all the skills and techniques they learnt on the project.

Listening to their conversations now it is hard to imagine that when they first started work, both had little practical knowledge about constructing a trail. They acquired welding, plastering and woodwork skills through hands-on experience and with the support of their seniors. But that was not the biggest challenge they encountered.

“Building the trail was really difficult, as there were so many sections. We were either drowned in sweat or drenched by rain while working,” Mr Lai explained.

One poignant memory for Mr Wan was of working during wildfires that raged through the countryside.

“There was only one thing for it: we stayed until the fire was extinguished. That was really hard.”

Lasting legacy

After nine months’ hard work the MacLehose Trail was finally opened on October 26, 1979.

These days Mr Wan and Mr Lai enjoy the trail for leisure instead of work.

Both said receiving compliments from family and friends or witnessing the sheer enjoyment of hikers on the trail made their hard work worthwhile.

They now hope to pass on their skills to the younger workers, so that a new generation of Hong Kong people can take care of the trail and ensure it lasts for decades to come.

(American Association for Cancer Research) Combining intratumoral electroporation of interleukin-12 (IL-12) DNA (tavokinogene telseplasmid, or TAVO) with the immune checkpoint inhibitor pembrolizumab (Keytruda) led to clinical responses in patients with immunologically quiescent advanced melanoma, according to results from a phase II trial.

(University of Houston) A University of Houston biomedical researcher is developing a new device to treat babies with blood disorders, because current technology is designed for adults. The ability to perform lifesaving leukapheresis safely and effectively in these most vulnerable pediatric patients will significantly increase their access to highly effective cell-based therapies.

Every summer, rainstorms occur in Hong Kong occasionally, leading to loss of property or even casualties.

(University of Barcelona) The yellow-legged gull has a high ability to adapt to human activities and benefit from these as a food resource during all year. This is stated in a scientific article published in the journal Ecology and Evolution whose first author is the researcher Francisco Ramírez, from the Faculty of Biology and the Biodiversity Research Institute (IRBio) of the University of Barcelona.

(University of Arkansas) Giant elliptical galaxies are not as likely as disk-shaped galaxies, such as our own Milky Way, to be cradles of technological civilizations, according to a recent paper by a University of Arkansas astrophysicist.

(DOE/Argonne National Laboratory) A group of the world's best X-ray science facilities has developed a strategy for cooperatively combating COVID-19.

(American Friends of Tel Aviv University) The research reveals that hunter-gatherer societies expressed a deep emotional and psychological connection with the animal species they hunted, especially after their disappearance. The study will help anthropologists and others understand the profound environmental changes taking place in our own lifetimes.