4 New Substances Added to List of Carcinogens
Credit: Marcin Balcerzak/Shutterstock
Four new substances have been added to a list of chemicals that may cause cancer compiled&by the U.S. Department of Health and Human Services (HHS).
The list of known carcinogens now includes a chemical called ortho-toluidine, which is used to make rubber chemicals, pesticides and dyes. Recent research has linked the substance to
in people.
Three other substances were added to a list of agents that are &reasonably anticipated to be human carcinogens.& These include a cleaning solvent called 1-bromopropane, a wood preservative mixture known as pentachlorophenol and cumene, which can be found in fuel products and even . []
&Identifying substances in our environment that can make people vulnerable to cancer will help in prevention efforts,& Linda Birnbaum, director of the National Institute of Environmental Health Sciences and the National Toxicology Program, . &This report provides a valuable resource for health regulatory and research agencies, and it empowers the public with information people can use to reduce exposure to cancer-causing substances.&
Ortho-toluidine was originally classed as &reasonably anticipated& to be a human carcinogen in 1983. But HHS scientists re-evaluated the substance, looking at three studies of dye workers and two studies of rubber-chemical workers who were regularly exposed to ortho-toluidine. They found enough evidence of a link between ortho-toluidine exposure and an increased risk of bladder cancer to call the chemical a known carcinogen, according to HHS. Rats also developed bladder tumors after they ingested ortho-toluidine.
Ortho-toluidine is no longer produced in the United States, but at least 1 million lbs. (450,000 kilograms) of the substance is imported into the country each year, according to HHS. The people who have the greatest risk of exposure are employees who work in chemical plants where ortho-toluidine is used to make rubber chemicals, dyes and pesticides.
HHS officials said they didn't have enough evidence to definitively prove that exposure to the other three chemicals can cause human cancers. But these substances do cause rats and mice to develop tumors, according to the agency.
In experiments, rodents that inhaled fumes of 1-bromopropane & a colorless to light yellow liquid solvent & developed tumors in several organs, including their skin, lungs and large intestine. The substance is used as a cleaner for optics, electronics and metals. It has also become popular in dry cleaning as a replacement for perchloroethylene, another chemical considered a health and environmental hazard.
Mice that inhaled cumene fumes&&and liver tumors, according to HHS's review.&The flammable liquid with a gasoline-like odor is found in coal tar and petroleum, as well as tobacco smoke. It is used primarily to make acetone and phenol.
Pentachlorophenol & a substance used to treat utility poles, wood pilings and fence posts & caused tumors in the liver and other organs of mice. In small studies of humans, exposure to this compound was associated with an increased risk of the blood cancer non-Hodgkin , but the HHS said it considered the evidence too limited to call pentachlorophenol a known carcinogen.
The HHS's 13th Report on Carcinogens, which now includes 243 listings total, is available online:
Follow Megan Gannon on&&and&&Follow us ,& &&. Original article on&.
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Copyright & 2015 All Rights Reserved.Two numbers are in the ratio 2 :3.When 4 is added to each number the ratio changes to 5 :7.　The sum of the two original numbers is____._作业帮
拍照搜题，秒出答案
Two numbers are in the ratio 2 :3.When 4 is added to each number the ratio changes to 5 :7.　The sum of the two original numbers is____.
Two numbers are in the ratio 2 :3.When 4 is added to each number the ratio changes to 5 :7.　The sum of the two original numbers is____.
翻译：两个数的比值是2：3.当每一个数都加上四的时候两个数的比值变成了5:7,这两个数的和是多少?x:y=2:3x+4:y+4=5:7,联立方程解得：x=16,y=24x+y=40
7(2X+4)=5(3X+4)14X+28=15X+15X=132X=263X=39所以The sum of the two numbers is 39
共线，collinear共面，coplanarity重合，coincidence正弦定理，sinetheorem余弦定理cosine theorem内接圆，inscribed circle外接圆circumcircle取值范围，numeric area垂直平分线，verticle bisector共园，com...Street Monument To Be Erected In Honor Of The Late Shin Hae Chul
(Photo : KCA Entertainment)
Fans and supporters of the late Shin Hae Chul, who passed away last year due to post-surgery complications, are banding together to push for the construction of a monument and memorial as part of a new Shin Hae Chul Street in dedication to the rock legend.Like Us on
The plans were revealed by a city hall spokesperson from Seongnam, Seoul where the Shin Hae Chul Street is being planned to be constructed. The singer's workroom is located in Seongnam.
"There have been discussions to build the memorial and monument which will contain analects. This project is not led by the municipality, it is rather only a reflection of the citizens' opinions. The opinions of fans and citizens are very important," the spokesperson told OSEN, according to an English translation report from .
"Songs of the late Shin Hae Chul is released throughout the city, and we are having discussions about erecting a monument recorded with analects as well as a memorial that will showcase relics," the spokesperson added.
There are plans to create the Shin Hae Chul Street starting from the singer's workroom and stretching to around 160 meters.
A &concluded that Shin Hae Chul's death was a result of medical negligence where his assigned surgeon failed to heed the artist's complaints of pain after his synechtomy procedure. Shin Hae Chul told the doctor his pain and discomfort but these were waved off as par for the course after surgery. Unfortunately, these turned out to be symptoms of serious complications than then led to a heart attack, a coma and the singer's death all within the following week after his surgery.
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