Weather Alert(2)!
"Wind Chill Advisory" ...Wind Chill Advisory remains in effect from 4 PM Saturday to noon EST Sunday... * locations...New York City...Long Island and most of northeast New Jersey. * Hazard types...potentially dangerous wind chills. * Timing...coldest wind chills late Saturday night into early Sunday morning. * Wind chill...18 below to 23 below due to temperatures as low as 1 below...and winds northwest 20 to 30 mph with gusts up to 45 mph. * Impacts...the frigid conditions will be dangerous to those venturing outside. Prolonged exposure may cause frostbite. Precautionary/preparedness actions... A Wind Chill Advisory means that very cold air and strong winds will combine to generate low wind chills. This will result in frost bite and lead to hypothermia if precautions are not taken. If you must venture outdoors...make sure you wear a hat and gloves. Maloit , "Special Statement" ...Dangerously cold air this weekend... Bitterly cold temperatures will move into the area this weekend. * Temperatures Saturday night into early Sunday morning will fall to around zero in and around the New York City and New Jersey Metro...Long Island...and coastal Connecticut. Temps will fall to 5 to 10 below across interior portions of northeast New Jersey...the lower Hudson Valley...and southern Connecticut. Wind chill values during this time could reach life threatening levels as cold as 20 to 30 below zero. * High temperatures on Sunday will only be in the teens. * Cold spells of this magnitude bring a risk of frostbite and hypothermia for anyone who does not take proper precautions. In addition...frozen pipes and overworked furnaces could leave your house without heat or running water...and car batteries run the risk of dying. * Never venture outdoors without wearing gloves...a hat and several layers of clothing. Wind chill values late Saturday night into Sunday morning could lead to frostbite in less than 30 minutes if proper precautions are not taken. * Run water at a trickle and keep Cabinet doors open to prevent pipes from freezing. * Never use a stove or oven to heat your home or use an open flame to melt frozen pipes. Many house fires result from these practices. * Check tire pressure and your car battery. Be sure your car has a winter safety kit that includes a blanket...warm clothes and gloves in case your car breaks down or becomes stranded. * Take extra steps to keep your pets warm and know their limits to cold. 356 PM EST Fri Feb 12 2016 ...Dangerously cold air this weekend... Bitterly cold temperatures will move into the area this weekend. * Temperatures Saturday night into early Sunday morning will fall to around zero in and around the New York City and New Jersey Metro...Long Island...and coastal Connecticut. Temps will fall to 5 to 10 below across interior portions of northeast New Jersey...the lower Hudson Valley...and southern Connecticut. Wind chill values during this time could reach life threatening levels as cold as 20 to 30 below zero. * High temperatures on Sunday will only be in the teens. * Cold spells of this magnitude bring a risk of frostbite and hypothermia for anyone who does not take proper precautions. In addition...frozen pipes and overworked furnaces could leave your house without heat or running water...and car batteries run the risk of dying. * Never venture outdoors without wearing gloves...a hat and several layers of clothing. Wind chill values late Saturday night into Sunday morning could lead to frostbite in less than 30 minutes if proper precautions are not taken. * Run water at a trickle and keep Cabinet doors open to prevent pipes from freezing. * Never use a stove or oven to heat your home or use an open flame to melt frozen pipes. Many house fires result from these practices. * Check tire pressure and your car battery. Be sure your car has a winter safety kit that includes a blanket...warm clothes and gloves in case your car breaks down or becomes stranded. * Take extra steps to keep your pets warm and know their limits to cold. 405 am EST Fri Feb 12 2016 ...Dangerously cold air this weekend... Bitterly cold temperatures will move into the area this weekend. * Temperatures Saturday night into early Sunday morning will fall to around zero in and around the New York City and New Jersey Metro...Long Island...and coastal Connecticut. Temps will fall to 5 to 10 below across interior portions of northeast New Jersey...the lower Hudson Valley...and southern Connecticut. Wind chill values during this time could reach life threatening levels as cold as 20 to 30 below zero. * High temperatures on Sunday will only be in the teens. * Cold spells of this magnitude bring a risk of frostbite and hypothermia for anyone who does not take proper precautions. In addition...frozen pipes and overworked furnaces could leave your house without heat or running water...and car batteries run the risk of dying. * Never venture outdoors without wearing gloves...a hat and several layers of clothing. Wind chill values late Saturday night into Sunday morning could lead to frostbite in less than 30 minutes if proper precautions are not taken. * Run water at a trickle and keep Cabinet doors open to prevent pipes from freezing. * Never use a stove or oven to heat your home or use an open flame to melt frozen pipes. Many house fires result from these practices. * Check tire pressure and your car battery. Be sure your car has a winter safety kit that includes a blanket...warm clothes and gloves in case your car breaks down or becomes stranded. * Take extra steps to keep your pets warm and know their limits to cold. 405 am EST Fri Feb 12 2016 ...Dangerously cold air this weekend... Bitterly cold temperatures will move into the area this weekend. * Temperatures Saturday night into early Sunday morning will fall to around zero in and around the New York City and New Jersey Metro...Long Island...and coastal Connecticut. Temps will fall to 5 to 10 below across interior portions of northeast New Jersey...the lower Hudson Valley...and southern Connecticut. Wind chill values during this time could reach life threatening levels as cold as 20 to 30 below zero. * High temperatures on Sunday will only be in the teens. * Cold spells of this magnitude bring a risk of frostbite and hypothermia for anyone who does not take proper precautions. In addition...frozen pipes and overworked furnaces could leave your house without heat or running water...and car batteries run the risk of dying. * Never venture outdoors without wearing gloves...a hat and several layers of clothing. Wind chill values late Saturday night into Sunday morning could lead to frostbite in less than 30 minutes if proper precautions are not taken. * Run water at a trickle and keep Cabinet doors open to prevent pipes from freezing. * Never use a stove or oven to heat your home or use an open flame to melt frozen pipes. Many house fires result from these practices. * Check tire pressure and your car battery. Be sure your car has a winter safety kit that includes a blanket...warm clothes and gloves in case your car breaks down or becomes stranded. * Take extra steps to keep your pets warm and know their limits to cold. -- Friday Feb.12 16,09:12 PM Weather  |  LIRR  |  Traffic  |  Traffic Cams |  Weather News

 

More Than Just X and Y: A New Genetic Basis for Sex Determination

Press Releases

Cold Spring Harbor researchers identify microRNAs that differentiate male and female fruit flies

Photo by: CSHL

Cold Spring Harbor, NY - August 18, 2014 - Men and women differ in plenty of obvious ways, and scientists have long known that genetic differences buried deep within our DNA underlie these distinctions. In the past, most research has focused on understanding how the genes that encode proteins act as sex determinants. But Cold Spring Harbor Laboratory (CSHL) scientists have found that a subset of very small genes encoding short RNA molecules, called microRNAs (miRNAs), also play a key role in differentiating male and female tissues in the fruit fly. 
 
A miRNA is a short segment of RNA that fine-tunes the activation of one or several protein-coding genes. miRNAs are able to silence the genes they target and, in doing so, orchestrate complex genetic programs that are the basis of development.
 
In work published in Genetics, a team of CSHL researchers and colleagues describe how miRNAs contribute to sexual differences in fruit flies. You’ve probably never noticed, but male and female flies differ visibly, just like other animals. For example, females are 25% larger than males with lighter pigmentation and more abdominal segments. 
 
The team of researchers, including Delphine Fagegaltier, PhD, lead author on the study, and CSHL Professor and Howard Hughes Medical Institute Investigator Greg Hannon, identified distinct miRNA populations in male and female flies. “We found that the differences in miRNAs are important in shaping the structures that distinguish the two sexes,” says Fagegaltier. “In fact, miRNAs regulate the very proteins that act as sex determinants during development.”
 
The team found that miRNAs are essential for sex determination even after an animal has grown to adulthood. “They send signals that allow germ cells, i.e. eggs and sperm, to develop, ensuring fertility,” Fagegaltier explains. “Removing one miRNA from mature, adult flies causes infertility.” More than that, these flies begin to produce both male and female sex-determinants. “In a sense, once they have lost this miRNA, the flies become male and female at the same time,” according to Fagegaltier. “It is amazing that the very smallest genes can have such a big effect on sexual identity.” 
 
Some miRNAs examined in the study, such as let-7, have been preserved by evolution because of their utility; humans and many other animals carry versions of them. “This is probably just the tip of the iceberg,” says Fagegaltier. “There are likely many more miRNAs regulating sexual identity at the cellular and tissue level, but we still have a lot to learn about these differences in humans, and how they could contribute to developmental defects and disease.”
 
This work was supported by National Institute of Health, Max Planck Society, and a kind gift from the late Kathryn W. Davis.
 
“A Genome-Wide Survey of Sexually Dimorphic Expression of Drosophila miRNAs Identifies the Steroid Hormone-Induced miRNA let-7 as a Regulator of Sexual Identity” appeared online in Genetics on July 31, 2014. The authors are: Delphine Fagegaltier, Annekatrin König, Assaf Gordon, Eric Lai, Thomas Gingeras, Gregory Hannon, and Halyna Shcherbata. The paper can be obtained online.
 
About Cold Spring Harbor Laboratory 
Founded in 1890, Cold Spring Harbor Laboratory (CSHL) has shaped contemporary biomedical research and education with programs in cancer, neuroscience, plant biology and quantitative biology. CSHL is ranked number one in the world by Thomson Reuters for the impact of its research in molecular biology and genetics. The Laboratory has been home to eight Nobel Prize winners. Today, CSHL's multidisciplinary scientific community is more than 600 researchers and technicians strong and its Meetings & Courses program hosts more than 12,000 scientists from around the world each year to its Long Island campus and its China center. For more information, visit cshl.edu.
 
Pictured: CSHL researchers have found that miRNAs, short RNA molecules, are responsible for sexual differences in fruit flies. Shown here are testes from a male fruit fly where a hormone that controls a key miRNA has been inactivated. The abnormal testes fail to make sperm. They now produce sex determinants (shown in red) that are found in the ovaries of female flies.

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