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إظهار الرسائل ذات التسميات Animal World. إظهار كافة الرسائل
إظهار الرسائل ذات التسميات Animal World. إظهار كافة الرسائل
الثلاثاء، 8 سبتمبر 2015
الجمعة، 21 أغسطس 2015
See the world's biggest heart
As the largest animal to have ever lived, the blue whale (Balaenoptera musculus) can also be expected to have some record-breaking internal organs.
Tales of its heart being as big as a car, with the aorta (its main artery) large enough for a human to swim through abound, but as finding intact specimens to research is rare, the truth has been difficult to find out.
So when a dead blue whale washed ashore in Newfoundland, Canada, experts saw a valuable opportunity.
A team from the Royal Ontario Museum (ROM) was sent to dissect the 76.5ft (23.3m) blue whale, which had died after becoming trapped in ice.
"It took four of us to push the heart out through a window we'd made between the ribs and the side of the chest cavity."
The organ that they retrieved can be seen in the video clip above, taken from Big Blue Live, a new series coming soon to BBC One in the UK and PBS in the US.
"I was expecting something the size of a car, but found a heart more like the size of maybe a small golf cart or circus bumper car for two," Ms Miller says.
But at 28st 4lb (180kg) it was still hefty and the ROM team used about 1,000 gallons of formaldehyde, which stops tissue from decomposing any further, to begin the preservation process.
"To our knowledge this is the first blue whale heart to be anatomically preserved for exhibit and study. People are always curious how big it is, and if it is the same as our heart, structurally," Ms Miller says.
The blue whale heart, along with the skeleton of the animal it came from, will eventually be put on display at the museum.
The team are also working with Dr Robert Henry and Dr Paul Nader, two anatomy specialists from Lincoln Memorial University, Tennessee, US, to properly document the whale.
"The blue whale represents the extreme upper limit of size and physiology, and its behaviour and physiological tolerances should be accordingly affected," Ms Miller says.
"Anatomically, not a lot has been published about the blue whale heart. We'd also like to have an answer for our visitors when they ask 'how big is it'?"Source==BBC====
Tales of its heart being as big as a car, with the aorta (its main artery) large enough for a human to swim through abound, but as finding intact specimens to research is rare, the truth has been difficult to find out.
A team from the Royal Ontario Museum (ROM) was sent to dissect the 76.5ft (23.3m) blue whale, which had died after becoming trapped in ice.
This is the first blue whale heart to be anatomically preserved"We had to get the chest cavity opened to expose the heart and then get in there and free the heart up from all of the surrounding tissues, getting in with what was left of the lungs and blood, pretty much up to my waist," explains Jacqueline Miller, a mammalogy technician from the ROM.
"It took four of us to push the heart out through a window we'd made between the ribs and the side of the chest cavity."
The organ that they retrieved can be seen in the video clip above, taken from Big Blue Live, a new series coming soon to BBC One in the UK and PBS in the US.
"I was expecting something the size of a car, but found a heart more like the size of maybe a small golf cart or circus bumper car for two," Ms Miller says.
The blue whale represents the extreme upper limit of size and physiologyThe aorta was also discovered to be slightly smaller than it is reputed to be, probably capable of fitting a human head inside.
But at 28st 4lb (180kg) it was still hefty and the ROM team used about 1,000 gallons of formaldehyde, which stops tissue from decomposing any further, to begin the preservation process.
"To our knowledge this is the first blue whale heart to be anatomically preserved for exhibit and study. People are always curious how big it is, and if it is the same as our heart, structurally," Ms Miller says.
The blue whale heart, along with the skeleton of the animal it came from, will eventually be put on display at the museum.
The team are also working with Dr Robert Henry and Dr Paul Nader, two anatomy specialists from Lincoln Memorial University, Tennessee, US, to properly document the whale.
"The blue whale represents the extreme upper limit of size and physiology, and its behaviour and physiological tolerances should be accordingly affected," Ms Miller says.
"Anatomically, not a lot has been published about the blue whale heart. We'd also like to have an answer for our visitors when they ask 'how big is it'?"Source==BBC====
الأربعاء، 19 أغسطس 2015
Head lice in Va., NC now resistant to common treatments
Staff, 13News Now 10:39 a.m. EDT August 19, 2015
Head lice. They're a problem in schools and other areas where children are in close quarters.
Now there's news that they're getting harder to kill.
A Southern Illinois University study shows lice in 25 states, including Virginia and North Carolina, are now immune to over-the-counter treatments.
High levels of gene mutations are desensitizing the insects to permethrin, the active ingredient lice shampoos, researchers say. It's in a family of insecticides called pyrethroids , which are widely used indoors and outdoors to control mosquitoes and other insects.
Lice can be treated with different chemicals, but most are only available by prescription.
Researcher Kyong Yoon, Ph.D, says the situation also offers a cautionary tale.
"If you use a chemical over and over, these little creatures will eventually develop resistance," Yoon says. "So we have to think before we use a treatment. The good news is head lice don't carry disease. They're more a nuisance than anything else."
Now there's news that they're getting harder to kill.
A Southern Illinois University study shows lice in 25 states, including Virginia and North Carolina, are now immune to over-the-counter treatments.
High levels of gene mutations are desensitizing the insects to permethrin, the active ingredient lice shampoos, researchers say. It's in a family of insecticides called pyrethroids , which are widely used indoors and outdoors to control mosquitoes and other insects.
Researcher Kyong Yoon, Ph.D, says the situation also offers a cautionary tale.
"If you use a chemical over and over, these little creatures will eventually develop resistance," Yoon says. "So we have to think before we use a treatment. The good news is head lice don't carry disease. They're more a nuisance than anything else."
Source==abc13====Read or Share this story: http://on.wvec.com/1NEOmlt
Rare Fish with 'Human-Like' Teeth Found in Delta
Photos of a mysterious fish caught in the Delta last week are going viral.
The photos were posted on Facebook by a woman who said she reeled it in near the Stockton Boat Docks. Many are now wondering if it is a dangerous piranha.
FOX40 spoke to many fisherman along the Delta to see if they had ever seen it before.
Duncan Darr is the manager of Cliff’s Marina. In the last decade, he has become an expert on Delta fishing. When FOX40 showed him the photo, he had no idea what it was.
Neither did fellow fishermen, Ben Pelka or Jerry Buchman. So we turned to the experts.
“This is called a Pacu. It’s in the piranha family,” California Fish and Wildlife spokesperson Andrew Hughan sand.
The
Pacu is native to the Amazon. In California, it is considered an
invasive species, and most likely, someone just dumped it in the Delta.
“In some states they are legal to be imported. Somebody probably brought them when they moved here from another state. It happens,” Hughan said.
Q&A with Andrew Hughan:
1. Will it hurt me?
A. “They’re in the piranha family. But they are not going to strip a cow carcass down in 45 seconds or anything like that.”
2. Can we eat it?
A. “The skin absorbs a lot of chemicals, so we do not recommend it.”
3. Can we still swim in the Delta?
A. “Yes, worst case scenario, it may give you a little bite, but there is a very small chance of that.”
4. There is an urban myth that fish from the piranha family will attack testicles. Is it true?
A. “They’ll eat other bugs, and other fish. But they’re not going to go after… Parts. Male parts? No, they’re not going to go after male parts That’s an urban myth.”
5. What do I do if I catch one?
A. Do not throw it back in the water. Instead, dispose of it properly or take it to an aquarium.Source==FOX40++++
The photos were posted on Facebook by a woman who said she reeled it in near the Stockton Boat Docks. Many are now wondering if it is a dangerous piranha.
FOX40 spoke to many fisherman along the Delta to see if they had ever seen it before.
Duncan Darr is the manager of Cliff’s Marina. In the last decade, he has become an expert on Delta fishing. When FOX40 showed him the photo, he had no idea what it was.
Neither did fellow fishermen, Ben Pelka or Jerry Buchman. So we turned to the experts.
“This is called a Pacu. It’s in the piranha family,” California Fish and Wildlife spokesperson Andrew Hughan sand.
“In some states they are legal to be imported. Somebody probably brought them when they moved here from another state. It happens,” Hughan said.
Q&A with Andrew Hughan:
1. Will it hurt me?
A. “They’re in the piranha family. But they are not going to strip a cow carcass down in 45 seconds or anything like that.”
A. “The skin absorbs a lot of chemicals, so we do not recommend it.”
3. Can we still swim in the Delta?
A. “Yes, worst case scenario, it may give you a little bite, but there is a very small chance of that.”
4. There is an urban myth that fish from the piranha family will attack testicles. Is it true?
A. “They’ll eat other bugs, and other fish. But they’re not going to go after… Parts. Male parts? No, they’re not going to go after male parts That’s an urban myth.”
5. What do I do if I catch one?
A. Do not throw it back in the water. Instead, dispose of it properly or take it to an aquarium.Source==FOX40++++
