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 Geplaatst: 07-06-2018 10:11:35 Onderwerp: blockers are a popular |
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MEXICO CITY Tim Anderson White Sox Jersey , Feb. 5 (Xinhua) -- Few companies have received as much attention in recent weeks as Oxitec, a British biotechnology company that breeds genetically modified (GM) insects to combat the spread of diseases such as dengue and the Zika virus.
Oxitec releases GM male mosquitoes with a self-limiting gene, essentially rendering them sterile and causing any offspring to die before they reach adulthood.
In trials around the world, including the Brazilian city of Piracicaba, Oxitec claims to have wiped out over 90 percent of the Aedes aegypti mosquito.
Given that this pesky critter is the main carrier and transmitter of Zika, chikungunya and dengue, this has led to a spike in interest in Oxitec's methods.
Hadyn Parry, CEO of Oxitec, told Xinhua in an exclusive interview that "our mosquitoes do not impact the disease; we just reduce the number of mosquitoes. You get Zika, dengue or chikungunya by being bitten by a mosquito carrying that disease. No mosquito means no disease, less mosquitoes means less disease," he said.
Both the United States and Brazil confirmed that the Zika virus had been propagated by sexual transmission and blood transfusion.
According to the U.S. Centers for Disease Control and Prevention, the Zika virus only remains in the bloodstream for a few weeks, meaning that eradicating mosquito populations would remove the threat of other types of transmission.
Despite this seemingly positive impact, the rollout of Oxitec's GM mosquitoes in Latin America to date has been limited. The city of Piracicaba, in the Brazilian state of Sao Paulo, which saw a trial release of Oxitec's mosquitoes in 2015, is expanding the project to cover about 60,000 people.
According to statistics provided by Oxitec, the city saw 133 cases of dengue in 2014 and the beginning of 2015. This was cut down to just one for the rest of 2015 after the Oxitec trial began.
However, the release of further Oxitec GM mosquitoes across the country faces a major obstacle. While Brazil's regulator for GM organisms has stated Oxitec's product poses no risk, final approval is needed by the Ministry of Health before commercialization can begin.
"But to market and sell our product, we need an authorization from the Ministry of Health. We think we are very close to getting that authorization," said Parry.
That decision would not just impact Oxitec's operations in Brazil but would determine if and when its GM mosquitoes could be released in other countries.
"Once Brazil approves us, I do not think we will see a similar time frame in other Latin American countries," the executive said. "This mosquito is the same species all around the world, our product is exactly the same, and a lot of Latin American cities are very similar."
However, should a country decide that certain differentiating factors warrant extra processes, Oxitec said it will be happy to carry out extra studies.
Parry said many countries and private companies are collaborating to develop a vaccine but such a solution may be slow.
A final hurdle for Oxitec has been the controversies that have grown around their methods. A cursory search on the Internet turns up a number of articles, questioning or outright blaming Oxitec and its GM mosquitoes.
While thorough questioning of scientific practices is welcome, especially for as important a topic as GM organisms, Parry said some of the circulating accusations are false and can affect lives.
"The WHO and Brazilian regulators have examined our technology and found no significant risk," he said. "However, if anyone has real evidence, or even a hypothesis to test out, they should come forward as that will be good for the debate."
The U.S Navy is sending a ship to see if a Chinese man attempting to set a sailing record from San Francisco to Shanghai is aboard his boat off Hawaii.
The U.S. Coast Guard began searching Tuesday for Guo Chuan after the Maritime Rescue Coordination Center China reported not hearing from him in 24 hours.
Coast Guard spokeswoman Tara Molle says a Coast Guard airplane and a Navy helicopter flying above the 97-foot trimaran have tried to contact him via radio, but he hasn't answered.
The USS Makin Island is heading to Guo's vessel to see if he's onboard.
Molle says Guo's racing vessel has an automatic identification system that showed it was 620 miles northwest of Oahu.
The 50-year-old sailor is trying to break a solo nonstop trans-Pacific world record.
Beta blockers are a popular treatment for controlling blood pressure, but is there any reason to worry about what effect they might have on male organ health? Some studies indicate they might increase the risk of tumescence dysfunction. Interestingly, some studies have also indicated that beta blockers can be a risk factor for developing Peyronie’s disease, also known as the “bent manhood disease.”
About beta blockers
Sometimes called beta-adrenergic blocking agents, beta blockers are frequently prescribed for high blood pressure and migraines. The tablet basically works by “blocking” epinephrine, a hormone which people know more familiarly as adrenaline.
Beta blockers can either work on the heart alone or on the heart and blood vessels. When used properly, they force the heart to beat a little more slowly, which in turn brings down otherwise-elevated blood pressure. Sometimes the medicine also helps open up blood vessels, which allows blood to flow more freely – thereby also helping to reduce high blood pressure.
Typically, beta blockers aren’t prescribed for high blood pressure until other methods have been tried and found wanting. They also are often prescribed in tandem with other medications that treat high blood pressure.
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