Chindia Alert: You’ll be Living in their World Very Soon
aims to alert you to the threats and opportunities that China and India present. China and India require serious attention; case of ‘hidden dragon and crouching tiger’.
Without this attention, governments, businesses and, indeed, individuals may find themselves at a great disadvantage sooner rather than later.
The POSTs (front webpages) are mainly 'cuttings' from reliable sources, updated continuously.
The PAGEs (see Tabs, above) attempt to make the information more meaningful by putting some structure to the information we have researched and assembled since 2006.
BEIJING (Reuters) – Tang Yue, a 27-year-old teacher from the city of Guilin in southwest China, steam-presses a blue dress and takes dozens of photographs before picking one to clinch her 200th online sale.
For a growing number of Chinese like Tang, hit by job losses, furloughs and salary cuts, the consumer economy has begun to spin in reverse. They are no longer buying – they are selling.
Instead of emerging from the coronavirus epidemic and returning to the shopping habits that helped drive the world’s second-largest economy, many young people are offloading possessions and embracing a new-found ethic for hard times: less is more.
With Tang’s monthly salary of about 7,000 yuan ($988), the self-described shopaholic said she has bought everything from Chanel lipsticks to Apple’s (AAPL.O) latest iPad in the past three years.
But the adrenaline rush that comes with binge-shopping is gone, said Tang, whose wages have been slashed with the suspension of all the classes on tourism management she usually teaches.
“The coronavirus outbreak was a wake-up call,” she said. “When I saw the collapse of so many industries, I realised I had no financial buffer should something unfortunate happen to me.”
There is no guarantee that the nascent minimalist trend will continue once the coronavirus crisis is fully over, but if it does, it could seriously damage China’s consumer sector and hurt thousands of businesses from big retailers to street-corner restaurants, gyms and beauty salons.
To be sure, there are signs that pent-up demand will drive a rush of spending as authorities reopen malls, leisure venues and tourist spots. In South Korea, the first major economy outside of China to be hit by the virus, people thronged malls this weekend to go “revenge shopping” to make up for time lost in lockdown.,
There are some signs that a similar trend will take hold in China, where some upscale malls are starting to get busy, although luxury firm Kering SA (PRTP.PA) – which owns Gucci, Balenciaga and other fashion brands – has said it is hard to predict how or when sales in China might come back.
A recent McKinsey & Co survey showed that between 20% and 30% of respondents in China said they would continue to be cautious, either consuming slightly less or, in a few cases, a lot less.
“The lockdown provided consumers with a lot of time and reasons to reflect and consider what is important to them,” said Mark Tanner, managing director at Shanghai-based research and marketing consultancy China Skinny.
“With much more of their days spent in their homes, consumers also have more time and reasons to sort through things they don’t feel they need – so they’re not living around clutter that is common in many apartments.”
#DITCHYOURSTUFF
Tang made a spreadsheet to keep track of her nearly 200 cosmetic products and hundreds of pieces of clothing. She then marked a few essentials in red that she wanted to keep. In the past two months, she has sold items worth nearly 5,000 yuan on second-hand marketplaces online.
Bargain-hunting online has become a new habit for some Chinese as the stigma that once hung over second-hand goods has begun to fade.
Idle Fish, China’s biggest online site for used goods, hit a record daily transaction volume in March, its parent company Alibaba (BABA.N) told Reuters.
Government researchers predict that transactions for used goods in China may top 1 trillion yuan ($141 billion) this year.
Posts with the hashtag #ditchyourstuff have trended on Chinese social media in recent weeks, garnering more than 140 million views.
Jiang Zhuoyue, 31, who works as an accountant at a traditional Chinese medicine company in Beijing – one of the few industries that may benefit from the health crisis – has also decided to turn to a simpler life.
“I used to shop too much and could be easily lured by discounts,” said Jiang. “One time Sephora offered 20% off for all goods, I then bought a lot of cosmetics because I feel I’m losing money if I don’t.”
Jiang, the mother of a 9-month-old baby, said she recently sold nearly 50 pieces of used clothing as the lockdown gave her the opportunity to clear things out. “It also offered me a chance to rethink what’s essential to me, and the importance of doing financial planning,” she said.
Eleven Li, a 23-year-old flight attendant, said she used to spend her money on all manner of celebrity-endorsed facial masks, snacks, concert tickets and social media activity, but now has no way to fund her spending.
“I just found a new job late last year, then COVID-19 came along, and I haven’t been able to fly once since I joined, and I’ve gotten no salary at all,” said Li, who said she was trying to sell her Kindle.
Some are even selling their pets, as they consider leaving big cities like Beijing and Shanghai where the high cost of living is finally catching up with them.
NO RETURN TO OLD WAYS?
As the coronavirus comes under control in China, the government is gradually releasing cities from lockdown, easing transport restrictions and encouraging consumers to venture back into malls and restaurants by giving out billions-worth of cash vouchers, worth between 10 yuan and 100 yuan.
But many people say they are still worried about job security and potential wage cuts because of the struggling economy. Nationwide retail sales have plunged every month so far this year.
Xu Chi, a Shanghai-based senior strategic analyst with Zhongtai Securities, said some Chinese consumers may prove the ‘21 Day Habit Theory,’ a popular scientific proposition that it only takes that long to establish new habits.
“We believe people’s spending patterns follow the well-known theory, which means most people in China, having been cooped-up at home for more than a month and not having binge-shopped, may break the habit and not return to their old ways,” Xu said.
Jiang said she was determined not to return to her free-spending ways and planned to cook more at home.
“I’ll turn to cheaper goods for some luxury brands,” she said. “I’ll choose Huawei’s smartphone, because (Apple’s) iPhone has too much brand premium.”
Tang, who has recently used 100 yuan of shopping coupons to stock up on food, is going to hold the purse strings even tighter.
“I’ve set my monthly budget at 1,000 yuan,” she said. “Including one – and just one – bottle of bubble tea.”
An antibody engineered from the animal’s immune system was found to neutralise the virus that causes Covid-19
American and Belgian researchers hope the discovery may help protect humans from the deadly illness
Winter the llama (front) lives on a farm operated by Ghent University’s Vlaams Institute for Biotechnology. Photo: Tim Coppens
A Belgian llama could hold the key to producing an antibody that neutralises the coronavirus that causes Covid-19.
More studies and clinical trials are needed to see if it can be used in humans to treat Covid-19, but the team of American and Belgian scientists who engineered the antibody said they were encouraged by their preliminary findings, which will be published in the journal Cell next week.
Jason McLellan, from the University of Texas at Austin and co-author of the study, described it as one of the “first antibodies known to neutralise Sars-CoV-2”, the official name for the virus.
“With antibody therapies, you’re directly giving somebody the protective antibodies and so, immediately after treatment, they should be protected,” he wrote in a press release.
“The antibodies could also be used to treat somebody who is already sick to lessen the severity of the disease.”
Winter the llama produced antibodies that proved effective against the Sars-CoV-2 virus. Photo: Tim Coppens
The scientists have been working on coronaviruses – including severe acute respiratory syndrome (Sars) and Middle East respiratory syndrome (Mers) – for years.
In 2016 they injected the llama, named Winter, with Sars and Mers in the hope of developing a treatment for the diseases.
“I thought this would be a small side project,” said Dorien De Vlieger from Ghent University in Belgium, who helped to isolate antibodies against coronaviruses from the llamas.
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“Now the scientific impact of this project became bigger than I could ever expect. It’s amazing how unpredictable viruses can be.”
A llama’s immune system produces two types of antibodies when it detects pathogens, one similar to human antibodies and one that is about a quarter of the size.
The antibodies produced by Winter were found to be effective in targeting the Sars virus’s spike protein, which allows it to bind to human cells.
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This year they decided to test the antibodies Winter had produced during the Sars experiment to see if it could prove effective against Covid-19.
Although it did bind itself to the Sars-CoV-2 virus it did so “weakly”, so the team then linked two copies of the antibody together to make it bind more effectively.
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“That was exciting to me because I’d been working on this for years. But there wasn’t a big need for a coronavirus treatment then. This was just basic research,” said Daniel Wrapp from the University of Texas, a co-author of the study.
The smaller type of antibodies produced by llamas, called single-domain antibodies or nanobodies, can be used in an inhaler, according to Wrapp.
“That makes them potentially really interesting as a drug for a respiratory pathogen because you’re delivering it right to the site of infection,” said Wrapp.
Researchers created an antibody dubbed VHH-72Fc (blue) that binds tightly to the Sars-CoV-2 spike protein (pink, green and orange), blocking the virus from infecting cells. Photo: University of Texas at Austin
The researchers are preparing for more trials with hamsters or primates to further test the antibody, before taking it to human trials.
The main subject of the study, Winter the llama, is now four years old and lives on a farm operated by Ghent University’s Vlaams Institute for Biotechnologym which said it has around 130 other llamas and alpacas at the facility.
Researchers conclude that the virus was circulating undetected in France in February
Findings highlight the difficulties governments face in tracing the source of coronavirus outbreaks
Researchers in France have carried out genetic analysis and found that the dominant types of the viral strains in the country did not come from China or Italy. Photo: AP
The coronavirus outbreak in France was not caused by cases imported from China, but from a locally circulating strain of unknown origin, according to a new study by French scientists at the Institut Pasteur in Paris.
Genetic analysis showed that the dominant types of the viral strains in France belonged to a clade – or group with a common ancestor – that did not come from China or Italy, the earliest hotspot in Europe.
“The French outbreak has been mainly seeded by one or several variants of this clade … we can infer that the virus was silently circulating in France in February,” said researchers led by Dr Sylvie van der Werf and Etienne Simon-Loriere in a non-peer reviewed paper released on bioRxiv.org last week.
The Covid-19 pandemic has infected more than 128,000 people in France and caused more than 23,000 deaths.
France detected the virus in late January, before any other country in Europe. A few patients with a travel history that included China’s Hubei province were sampled on January 24 and tested positive.
The Covid-19 pandemic has infected more than 128,000 people in France and caused more than 23,000 deaths. Photo: AFP
The French government took quick and decisive measures to trace contacts of the infected people and shut down the chance of further infection.
However, these strains were not found in patients tested after the initial imported cases, suggesting “the quarantine imposed on the initial Covid-19 cases in France appears to have prevented local transmission”, the researchers said.
The Pasteur institute collected samples from more than 90 other patients across France and found the strains all came from one genetic line. Strains following this unique path of evolution had so far only been detected in Europe and the Americas.
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The earliest sample in the French clade was collected on February 19 from a patient who had no history of travel and no known contact with returned travellers.
Several patients had recently travelled to other European countries, the United Arab Emirates, Madagascar and Egypt but there was no direct evidence that they contracted the disease in these destinations.
To the researchers’ surprise, some of the later strains collected were genetically older – or closer to the ancestral root – than the first sample in this clade.
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A possible explanation, according to the authors, was that local transmission had been occurring in France for some time without being detected by health authorities.
The French government may have missed detecting the transmission. According to the researchers, a large proportion of those patients might have had mild symptoms or none at all.
The researchers also found that three sequences later sampled in Algeria were closely related to those in France, suggesting that travellers from France might have introduced the virus to the African country and caused an outbreak.
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Benjamin Neuman, professor and chair of biological sciences with the Texas A&M University-Texarkana, said the French strains might have come from Belgium, where some sequences most closely related to the original strain from China were clustered.
“Since the earliest European strains of [the coronavirus] Sars-CoV-2 seem to be associated with Belgium, the idea that the virus spread from Belgium to both Italy and France at around the same time seems plausible, as this paper contends,” he said.
France is the latest in a growing number of countries and areas where no direct link between China and local outbreaks could be established.
The dominant strains in Russia and Australia, for instance, came from Europe and the United States, respectively, according to some studies.
These findings have drawn fire from some politicians who have tried to deflect domestic anger over their handling of the crisis by blaming China.
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“So now the Fake News @nytimes is tracing the CoronaVirus origins back to Europe, NOT China. This is a first!” he tweeted on April 11, referring to a story about the studies in the The New York Times’ science section.
The findings also highlight the difficulties governments face in tracing the source of coronavirus outbreaks.
Less-developed countries may never know where their strains came from due to inadequate testing and sequencing capability.
India, for example, has released the genetic sequence of fewer than 40 samples to the public so far, a small number considering its huge population.
Most of the strains sampled in 35 early cases came from clades that could be traced to Italy and Iran, with only a few from China, according to a recent study. But researchers were not able to track further because of the lack of data.
A scientist on the study, Dr Mukesh Thakur, of the Zoological Survey of India, said it was too early to rule out China as the source of outbreaks in India because the number of samples at hand was limited.
A 20-year-old student studying medicine in Wuhan, for instance, might have come in contact with many people on the way home before she was tested positive on January 30.
Thakur said local media reported that the Indian government quarantined 3,500 people possibly linked to three positive cases imported from Wuhan.
“God knows how many of them tested positive in the subsequent stages,” Thakur said in an email response to the Post’s queries on Tuesday.
Some prominent scientists, including Francis Collins, director of the US National Institutes of Health, said the virus might have been spreading quietly in humans for years, or even decades, without causing a detectable outbreak.
The virus had thus adapted well to the human body. Some genes regulating its binding to host cells were similar, or even identical, to those found in some other highly infectious human viruses, such as HIV and Ebola.
According to some estimates, the ancestor of Sars-CoV-2, the virus causing Covid-19, might have left bats between 50 and 70 years ago. A recent study by a team of geneticists in Oxford University estimated the first outbreak of the current pandemic could have occurred as early as September last year.
They found that the dominant strains circulating in China and Asia were genetically younger than some popular strains in the United States.
Researchers from Imperial College in London looked at how 11 countries had responded to the crisis and estimated how many lives had been saved by intervention
Some of the worst affected countries such as Italy and Spain would have seen tens of thousands more deaths, according to the model
Empty streets outside the Colosseum in Rome. Photo: AFP
Mass lockdowns and widespread social distancing may have prevented 59,000 Covid-19 deaths, according to a new model from Imperial College in London.
A team of researchers – including Neil Ferguson, whose projections helped inform the British government’s response to the outbreak and Samir Bhatt – estimated that tens of thousands of lives had been saved in 11 countries as a result of measures such as case isolation, school closures, bans on mass gatherings as well as local and national lockdowns.
The measures had a “substantial impact in reducing transmission” for countries with more advanced epidemics, with an estimated 38,000 deaths averted in Italy and 16,000 in Spain, but it is “too early to be sure” about similar reductions for countries in the earlier stages of the outbreak, researchers said.
Most countries in the model – Austria, Belgium, Denmark, France, Germany, Norway, Sweden, Switzerland and the United Kingdom – began their interventions between March 12 and 14.
“While we cannot determine which set of interventions have been most successful, taken together, we can already see changes in the trends of new deaths,” the researchers said.
“We note that substantial innovation is taking place, and new, more effective interventions or refinements of current interventions, alongside behavioural changes will further contribute to reductions in infections.”
The report, published on Monday, also estimated that between 7 and 43 million people had been infected in the 11 countries by late March – somewhere between 1.88 per cent and 11.43 per cent of the population – and said a large number of cases had probably gone unreported.
On average, the proportion of the population infected in the assessed countries was 4.9 per cent, with the highest estimates in Spain and Italy, and the lowest in Germany and Norway.
The coronavirus that causes Covid-19 first began to spread late last year in central China, but has since become a devastating global pandemic, with the most confirmed cases in the United States, Italy, Spain, Germany, France and mainland China.
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A separate study by Ferguson and other researchers, including Imperial College epidemiologist Azra Ghani, published on Monday in The Lancet found that the overall case fatality ratio for Covid-19 was lower than estimates for the severe acute respiratory syndrome (Sars) and Middle East respiratory syndrome (Mers) coronaviruses, but “substantially higher” than those of recent influenza pandemics such as the H1N1 influenza in 2009.
“With the rapid geographical spread observed to date, Covid-19 therefore represents a major global health threat in the coming weeks and months,” the researchers said.
“Our estimate of the proportion of infected individuals requiring hospitalisation, when combined with likely infection attack rates (around 50–80 per cent), show that even the most advanced health care systems are likely to be overwhelmed.
“These estimates are therefore crucial to enable countries around the world to best prepare as the global pandemic continues to unfold.”
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The study also found that the risk of death increased significantly for individuals in older age groups, although they noted early results indicate children are not at a lower risk of infection compared with adults.
Using data from China, researchers estimated the overall case fatality ratio to be at 1.38 per cent, with a lower ratio of 0.32 per cent for under-60s, compared with 6.4 per cent for over-60s and rising to 13.4 per cent for people who were over 80.
“It is clear from the data that has emerged from China that case fatality ratio increases substantially with age,” they said.
The age gradient was also observed in cases outside China, where the fatality ratio was estimated at 1.4 per cent for people under the age of 60, compared with 4.5 per cent for those 60 and over.
Image copyright GETTY IMAGESImage caption Most Chinese people don’t actually consume dogs and cats and never plan to
Shenzhen has become the first Chinese city to ban the sale and consumption of dog and cat meat.
It comes after the coronavirus outbreak was linked to wildlife meat, prompting Chinese authorities to ban the trade and consumption of wild animals.
Shenzhen went a step further, extending the ban to dogs and cats. The new law will come into force on 1 May.
Thirty million dogs a year are killed across Asia for meat, says Humane Society International (HSI).
However, the practice of eating dog meat in China is not that common – the majority of Chinese people have never done so and say don’t want to.
“Dogs and cats as pets have established a much closer relationship with humans than all other animals, and banning the consumption of dogs and cats and other pets is a common practice in developed countries and in Hong Kong and Taiwan,” the Shenzhen city government said, according to a Reuters report.
“This ban also responds to the demand and spirit of human civilization.”
Animal advocacy organisation HSI praised the move.
“This really could be a watershed moment in efforts to end this brutal trade that kills an estimated 10 million dogs and 4 million cats in China every year,” said Dr Peter Li, China policy specialist for HSI.
However, at the same time as this ruling, China approved the use of bear bile to treat coronavirus patients.
Bear bile – a digestive fluid drained from living captive bears – has long been used in traditional Chinese medicine.
The active ingredient, ursodeoxycholic acid, is used to dissolve gallstones and treat liver disease. But there is no proof that it is effective against the coronavirus and the process is painful and distressing for the animals
Brian Daly, a spokesman for the Animals Asia Foundation, told AFP: “We shouldn’t be relying on wildlife products like bear bile as the solution to combat a deadly virus that appears to have originated from wildlife.”
In February, Chinese authorities banned the trade and consumption of wild animals.
The move came after it emerged that a market in Wuhan selling wild animals and wildlife meat could have been the starting point for the outbreak of the new coronavirus, providing the means for the virus to travel from animals to humans.
News of this led the Chinese government to crack down strongly on the trade and on the markets that sold such products.
Image copyright GETTY IMAGESImage caption File photo of a wet market in China
There are now close to one million confirmed cases of the virus worldwide, and more than 47,000 deaths, according to a Johns Hopkins University tally.
In China alone, there are 81,589 confirmed cases and 3,318 deaths, said the National Health Commission.
Scientists and researchers are still no closer to finding out what the source of the virus is and how it could have spread to humans.
Virus may have jumped from animal to humans long before the first detection in Wuhan, according to research by an international team of scientists
Findings significantly reduce the possibility of the virus having a laboratory origin, director of the US National Institute of Health says
An international team of scientists say the coronavirus may have jumped from animal to humans long before the first detection in China. Photo: AP
The coronavirus that causes Covid-19 might have been quietly spreading among humans for years or even decades before the sudden outbreak that sparked a global health crisis, according to an investigation by some of the world’s top virus hunters.
Researchers from the United States, Britain and Australia looked at piles of data released by scientists around the world for clues about the virus’ evolutionary past, and found it might have made the jump from animal to humans long before the first detection in the central China city of Wuhan.
Though there could be other possibilities, the scientists said the coronavirus carried a unique mutation that was not found in suspected animal hosts, but was likely to occur during repeated, small-cluster infections in humans.
The study, conducted by Kristian Andersen from the Scripps Research Institute in California, Andrew Rambaut from the University of Edinburgh in Scotland, Ian Lipkin from Columbia University in New York, Edward Holmes from the University of Sydney, and Robert Garry from Tulane University in New Orleans, was published in the scientific journal Nature Medicine on March 17.
Dr Francis Collins, director of the US National Institute of Health, who was not involved in the research, said the study suggested a possible scenario in which the coronavirus crossed from animals into humans before it became capable of causing disease in people.
“Then, as a result of gradual evolutionary changes over years or perhaps decades, the virus eventually gained the ability to spread from human to human and cause serious, often life-threatening disease,” he said in an article published on the institute’s website on Thursday.
In December, doctors in Wuhan began noticing a surge in the number of people suffering from a mysterious pneumonia. Tests for flu and other pathogens returned negative. An unknown strain was isolated, and a team from the Wuhan Institute of Virology led by Shi Zhengli traced its origin to a bat virus found in a mountain cave close to the China-Myanmar border.
The two viruses shared more than 96 per cent of their genes, but the bat virus could not infect humans. It lacked a spike protein to bind with receptors in human cells.
Coronaviruses with a similar spike protein were later discovered in Malayan pangolins
by separate teams from Guangzhou and Hong Kong, which led some researchers to believe that a recombination of genomes had occurred between the bat and pangolin viruses.
Doctors in Wuhan began noticing a surge in the number of people suffering from a mysterious pneumonia in December. Photo: Handout
But the new strain, or SARS-Cov-2, had a mutation in its genes known as a polybasic cleavage site that was unseen in any coronaviruses found in bats or pangolins, according to Andersen and his colleagues.
This mutation, according to separate studies by researchers from China, France and the US, could produce a unique structure in the virus’ spike protein to interact with furin, a widely distributed enzyme in the human body. That could then trigger a fusion of the viral envelope and human cell membrane when they came into contact with one another.
Some human viruses including HIV and Ebola have the same furin-like cleavage site, which makes them contagious.
It is possible that the mutation happened naturally to the virus on animal hosts. Sars (severe acute respiratory syndrome) and Mers (Middle East respiratory syndrome), for instance, were believed to have been direct descendants of species found in masked civets and camels, which had a 99 per cent genetic similarity.
There was, however, no such direct evidence for the novel coronavirus, according to the international team. The gap between human and animal types was too large, they said, so they proposed another alternative.
“It is possible that a progenitor of SARS-CoV-2 jumped into humans, acquiring the genomic features described above through adaptation during undetected human-to-human transmission,” they said in the paper.
“Once acquired, these adaptations would enable the pandemic to take off and produce a sufficiently large cluster of cases to trigger the surveillance system that detected it.”
They said also that the most powerful computer models based on current knowledge about the coronavirus could not generate such a strange but highly efficient spike protein structure to bind with host cells.
The study had significantly reduced, if not ruled out, the possibility of a laboratory origin, Collins said.
“In fact, any bioengineer trying to design a coronavirus that threatened human health probably would never have chosen this particular conformation for a spike protein,” he said.
The findings by Western scientists echoed the mainstream opinion among Chinese researchers.
Zhong Nanshan, who advises Beijing on outbreak containment policies, had said on numerous occasions that there was growing scientific evidence to suggest the origin of the virus might not have been in China.
“The occurrence of Covid-19 in Wuhan does not mean it originated in Wuhan,” he said last week.
A doctor working in a public hospital treating Covid-19 patients in Beijing said numerous cases of mysterious pneumonia outbreaks had been reported by health professionals in several countries last year.
Re-examining the records and samples of these patients could reveal more clues about the history of this worsening pandemic, said the doctor, who asked not to be named due to the political sensitivity of the issue.
“There will be a day when the whole thing comes to light.”
New material is almost identical in structure to human enamel, which does not regenerate itself
Crystal-like mineral can grow on teeth and last permanently, researchers say
Drops of the liquid solution are applied to a human tooth. Photo: Zhejiang University
Scientists at a Chinese university say they have discovered the world’s first material that can repair damaged tooth enamel once and last for life.
A few drops of the liquid solution can fix all invisible cracks and wear on an ageing molar, according to researchers at Zhejiang University in Hangzhou, eastern China, whose work was published on Friday in the journal Science Advances.
The material, calcium phosphate ion clusters, can grow a thin layer of protective shield on teeth, the research showed. The transparent, crystal-like mineral has a structure resembling fish scales and a high mechanical strength – almost identical to the enamel on a human tooth.
Its repair of the tooth “would be permanent”, wrote the researchers, led by Professor Tang Ruikang at the university’s chemistry department.
A tooth’s non-repaired left side (darker) and repaired right side (lighter) are compared using a fluorescent chemical. Photo: Zhejiang University
The technology could be developed as an effective remedy in clinical practice for enamel erosion, the main cause of tooth decay, Tang’s team said. Tooth decay affects almost half of the world’s population, costing dental patients in the United States and European Union a combined US$200 billion annually, according to the World Dental Federation.
Enamel, the outer covering of teeth, is the hardest tissue in the human body, protecting teeth during biting and chewing food.
Unlike other tissues such as muscle, bone and skin, enamel is generated by cells that die immediately after completing their job. The human body cannot produce more of them, so when enamel breaks or chips, it will not regenerate itself.
For decades, researchers around the world have conducted studies to seek a solution, but the artificial materials tested previously could not recreate precisely the fine structure of natural enamel, leaving gaps or holes that could cause it to break off real enamel.
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Tang’s team claim their new material can grow seamlessly on human teeth. They mixed two different types of repairing material together to form tiny clusters of mineral particles only 1.5 nanometres in diameter – smaller than a strand of human DNA.
Unlike in previous experiments, these clusters could remain stable for a long time without clumping together, making precise reconstruction of an enamel-like structure possible.
Chen Haifeng, associate professor at Peking University’s biomedical engineering department, said that the research was a positive step but that the new material might need improvements before clinical use.
For instance, the artificial layer requires two days to grow, which could be difficult for dentists to schedule with patients.
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The liquid solution contains triethylamine, a toxic substance with a very strong smell, which may pose a health risk, according to Chen. “But it doesn’t mean we can’t do anything,” he said.
The researchers said the chemical would quickly vaporise and none would be left in the teeth after the protective shield had formed.
Some products preventing enamel erosion and decay, such as toothpaste with enamel-strengthening ingredients, are already available in shops.
“Prevention is the best approach,” Chen said. “We should never wait until the damage is done. Our teeth are a miracle of nature. Artificial replacement will never do the job as well.”
Researchers will conduct tests at site in Gansu to see whether it will make a viable facility to store highly radioactive waste safely
Scientists say China has the chance to become a world leader in this field but has to find a way to ensure it does not leak
A preliminary design for the Beishan Underground Research Laboratory. Photo: Handout
China has chosen a site for an underground laboratory to research the disposal of highly radioactive waste, the country’s nuclear safety watchdog said on Wednesday.
Officials said work will soon begin on building the Beishan Underground Research Laboratory 400 metres underground in the northwestern province of Gansu.
Liu Hua, the head of the Chinese National Nuclear Safety Administration, said work would be carried out to determine whether it would be possible to build a repository for high-level nuclear waste deep underground.
“China sees radioactive waste disposal as a very important part [of the development nuclear energy],” said Liu. “To develop nuclear energy, we must have safe storage and disposal of nuclear waste.”
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The Chinese authorities see nuclear power an important source of energy that will help to curb carbon emissions and pollution as well as reducing its dependence on fuel imports.
But while the country has made great strides in the development of nuclear power, it needs to find a safe and reliable way of dealing with its growing stockpiles of nuclear waste.
Liu said the Gansu site had been identified as a possible location for a deep nuclear waste store after years of searching.
Once the laboratory is built, scientists and engineers will start experiments to confirm whether it will make a viable underground storage facility.
“Based on the data of the experiments, we can then decide if we are going to pick this as the final site,” he added.
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Chinese officials usually stay tight-lipped about how nuclear waste is disposed of mainly because of fears that any discussion of the topic would trigger safety fears, although in recent years more efforts have been made to inform the public to win support.
Scientists say that nuclear waste can be divided into three categories depending on the level of radioactivity.
Low-level waste consists of minimally radioactive materials such as mop heads, rags, or protective clothing used in nuclear plants, while intermediate-level waste covers things such as filters and used reactor components.
High-level waste, however, is generated by the reprocessing of spent nuclear fuel and scientists generally agree that the safest way to dispose of it is to bury it deep underground in areas where the geology means it will have a minimal impact on the environment while it decays over thousands of years.
The facility will be built in a remote part of Gansu province. Photo: Handout
Some Chinese scientists said the country had the chance to lead the world in this area of research but others have expressed concerns about safety.
Jiang Kejun, a senior researcher at the Energy Research Institute of China’s National Development and Reform Commission, said that very few countries in the world are studying this form of nuclear waste disposal.
“It gives China an opportunity to be a leader in research in this area, plus China has the technology and financial means,” he said.
About a dozen countries including France, Switzerland, Japan, and the United States have carried out research in this area, but in recent years most have abandoned or scaled back their programmes.
At present there are storage sites operating in Finland and the US, but other countries such as Germany have abandoned plans to build similar facilities.
Washington blacklists Chinese nuclear firms for ‘helping military acquire US technology’
But despite broad scientific support for underground disposal, some analysts and many members of the public remain sceptical about whether it is really safe.
Lei Yian, an associate professor at the School of Physics at Peking University, said there was no absolute guarantee that the repositories would be safe when they are come into operation.
“Leakage has happened in [repositories] in the US and the former Soviet Union … it’s a difficult problem worldwide,” he said. “If China can solve it, then it will have solved a global problem.”
China is also building more facilities to dispose of low and intermediate level waste. Officials said new plants were being built in Zhenjiang, Fujian and Shandong, three coastal provinces that currently lack disposal facilities.
At present, two disposal sites for low and intermediate-level waste are in operation in Gansu and Guangdong provinces.
Researchers say system should allow them to track any sound-emitting source – from nuclear subs to whales – using a simple listening device mounted on a buoy, underwater drone or ship
Breakthrough builds on previous work by team from Beijing and San Diego
A new AI system developed by Chinese and US scientists could make detecting nuclear submarines possible even in unknown waters. Photo: Xinhua
Scientists from China and the United States have developed a new artificial intelligence
-based system that they say will make it easier to detect submarines in uncharted waters.
The technology builds on earlier work by the team, led by Dr Niu Haiqiang from the Institute of Acoustics at the Chinese Academy of Sciences in Beijing, which saw them develop a deep-learning algorithm that could improve the speed and precision of detection.
The algorithm, however, needs a large amount of data to work, so its use is limited to waters that have already been fully charted. In contrast, the upgrade works in all waters, charted or otherwise.
Even killer whales will be unable to hide from the new technology. Photo: Reuters
Niu and his colleagues, who included scientists from the Scripps Institution of Oceanography at the University of California San Diego, started by developing a simulator to generate a wide range of virtual environments from which the algorithm was able to learn.
Once it had assimilated that information, the simulator was able to analyse real-life data taken from the world’s oceans and seas, the team said in a paper published in the July issue of The Journal of the Acoustical Society of America.
It is now able to help a single hydrophone locate more than 80 per cent of underwater targets within an uncharted area with a margin of error of less than 10 metres (33 feet), the paper said.
Chinese monitoring devices installed near US submarine base
The researchers said the new technology should allow them to track any sound-emitting source – be it a nuclear submarine, a whale or even an emergency beeper from a crashed aircraft – using a simple listening device mounted on a buoy, underwater drone or ship.
The scientists worked together to improve the sensitivity and accuracy of passive underwater surveillance technology, according to the academy’s website.
The new technology might also be able to detect emergency beepers from crashed aircraft. Photo: AFP
Locating targets in unfamiliar waters is challenging because the AI relies on environmental data parameters such as underwater currents and seabed landscapes.
But obtaining such information is not easy, and often impossible.
For instance, the United States does not allow China to collect information in waters close to its west coast, while Beijing forbids the US from getting too close to its military facilities in the South China Sea.
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Professor Zhang Renhe, a researcher at the Institute of Acoustics who was not involved in the study, said the latest development was encouraging.
“AI can be a useful assistant to underwater target recognition,” he said. “In a way it is similar to the speech recognition technology on our mobile phones.”
But he said scientists were still wrestling with exactly how the technology worked.
“It is like a black box with some inner workings that are still unexplained,” he said.
Researchers were now working on ways to combine the new AI technology with the physical models for underwater target detection that have been developed in recent decades, Zhang said.
“This is a new frontier for fundamental science,” he said. “It requires international cooperation.”
BEIJING, May 27 (Xinhua) — China’s Ministry of Education has asked universities to improve administration to boost scientific research.
In a circular, the ministry required simplifying procedures for reimbursement of expenses on research activities which include attending meetings, counseling, purchasing equipment and services, among others.
Internet-based reimbursement is encouraged and approval will also be streamlined, according to the circular.
It also demanded universities improve the system of appointing academic assistants and financial assistants for researchers, and allocate more funds to raise researchers’ bonuses.
The interference with scientific research must be reduced to a minimum, the circular said.
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