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Scientists discover how sharks shine green to get noticed by their mates

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There are some species of sharks that in the depths of the sea seem to emit a bright green light. This is a biofluorescence phenomenon that only other sharks of their species can see.

The phenomenon of biofluorescence in certain species of sharks has never been fully studied, at least until today: David Gruber, a professor at the City University of New York, has published with his colleagues a new study on iScience to clarify this mechanism and is quite different from those who use other sea creatures to “shine”.

Gruber, along with his colleague Jason Crawford, a professor at Yale University, analyzed in particular this characteristic in two species of sharks, Cephaloscyllium ventriosum, endemic to the eastern Pacific, and Scyliorhinus retifer, endemic to the western Atlantic.

They first understood that the skin of these two sharks could present two shades, one lighter and one darker, through the extraction of particular chemical substances. They finally discovered that it was a particular fluorescent molecule responsible for the effect, a molecule that was present only in fair skin.

As Gruber himself explains, “the exciting part of this study is the description of a completely new form of marine biofluorescence from sharks – one based on brominated metabolites of small molecules of tryptophan-quinurenine.”

Thanks to this system, they can see each other better without the other animals being able to see the difference in color and in the fluorescence of the skin: “Imagine if you were bright green, but only you could see me bright green and the others could not,” reports Crawford hinting how this feature can be beneficial in many situations. In addition, scientists have discovered that these molecules that carry out biofluorescence also show antimicrobial properties.

Ore ii two scientists intend to exploit this knowledge to see if they can be useful to generate “molecular systems for imaging in the laboratory or in medicine,” according to Crawford, according to which “imaging is an incredibly important biomedical target that these types of systems could help progress in the future.”

Julie Smith

I am a journalist with extensive experience working with different organizations in Kentucky, starting out as an editor with The Paducah Sun and later joining The Louisville Times. I am very happy to have joined Jubobarta News as a volunteer contributor, and submit research and content during my spare time. I am a long term subscriber to Nature and Scientific American, and frequently read up on new scientific research.

1263 Cerullo Road, Louisville Kentucky, 40244
502-375-7899
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Julie Smith
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Efficient hybrid tandem solar cells created by Korean scientists

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High-efficiency tandem photovoltaic devices with quantum colloidal solar cells and photoactive materials of organic mass heterogjunction have been developed by a team of UNIST researchers led by Professor Sung-Yeon Jang.
The colloidal quantum solar cells (CQD) have soon attracted considerable attention in the field of photovoltaic energy because they are flexible and lightweight, easier to manufacture than conventional silicon solar cells and without loss of efficiency.

Quantum dots are nanoscopic-sized semiconductor particles. They have various useful and interesting characteristics, primarily an emission wavelength that depends on the size.
Basically, quantum points can absorb light in the near infrared, something that other cells and active photo layers cannot do.

Jang’s research team has developed a new photoactive quantum point technology that compensates for the loss of external quantum efficiency in the near infrared region. They also used an intermediate layer to achieve power conversion efficiency. These new tandem hybrid solar cells are made at room temperature and therefore their manufacture is cheaper than silicon solar cells.
“The hybrid tandem device has shown almost negligible degradation after storing air for three months,” says Jang himself.

Julie Smith

I am a journalist with extensive experience working with different organizations in Kentucky, starting out as an editor with The Paducah Sun and later joining The Louisville Times. I am very happy to have joined Jubobarta News as a volunteer contributor, and submit research and content during my spare time. I am a long term subscriber to Nature and Scientific American, and frequently read up on new scientific research.

1263 Cerullo Road, Louisville Kentucky, 40244
502-375-7899
[email protected]
Julie Smith
Continue Reading

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A new species of turtle in Texas that lived almost 100 million years ago has been classified

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Analyzing the remains found at the Arlington Archosaur Site, a site with various fossil remains from the late Cretaceous period in Texas, a team of researchers described four species of extinct turtles, one of which is named after paleontologist Derek Main.

This site was discovered in 2003 and proved to be a prolific location for late Cretaceous remains, remnants of life forms that lived more than 90 million years ago. It is a wetland located near the shore of a peninsula and already in the past has provided several fossils of ancient crocodiles, dinosaurs, mammals, amphibians, fish, invertebrates and even plants.

However, the turtle fossils discovered at this site had proved quite rare, at least until this study that was published in Palaeontology Electronica. The new species was named Trinitichelys maini. It is a Baenidae turtle, an extinct group of North American aquatic turtles that lived from the Cretaceous to the Eocene era.

Of medium size, these turtles showed strongly fused bones and upper shell and lived near rivers. The Trinitichelys maini is the oldest turtle of this group found in the North American subcontinent of Appalachia, a region that during the Cretaceous period was separated from Laramidia, the western subcontinent of North America.

In addition to the new classification, researchers described three other turtles, one of which is the oldest side-necked turtle (Pleurodira order) ever found in North America. These turtles are characterized by the particular way they withdraw their heads inside their shells: they do so by bending their necks on the horizontal plane.

The other two turtles described are one belonging to the group of trionichids (Trionychidae), or soft-shelled turtles, and another belonging to the genus Naomichelys (family Helochelydridae ).

Julie Smith

I am a journalist with extensive experience working with different organizations in Kentucky, starting out as an editor with The Paducah Sun and later joining The Louisville Times. I am very happy to have joined Jubobarta News as a volunteer contributor, and submit research and content during my spare time. I am a long term subscriber to Nature and Scientific American, and frequently read up on new scientific research.

1263 Cerullo Road, Louisville Kentucky, 40244
502-375-7899
[email protected]
Julie Smith
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Key mechanism of epilepsy in Angelman syndrome discovered by researchers

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In the course of research defined as “innovative,” a team of researchers from the Duke-NUS Medical School and the National Neuroscience Institute (NNI), Singapore, discovered a mechanism considered to be basic with regard to epilepsy in Angelman syndrome. This discovery, according to the researchers themselves, could lead to new therapies in the future.

Angelman’s syndrome (AS) is a rare genetic disease due to a defect in the process of chromosome duplication, often accompanied by delays in psychological and motor development, cognitive disabilities and other symptoms including epilepsy. In the course of the study, researchers at the Singapore Institutes used a new experimental methodology with human neural cells and brain organelles to understand the mechanism of epileptic seizures in this syndrome.

The researchers discovered the role of the ion channel in the hyperactivity of the brain network that triggers convulsions. The latter would be linked to gene deficiency of the ubiquitin ligase protein E3A (UBE3A) within neurons. As this is a syndrome that cannot be treated at present, this discovery could, therefore, be very important.

“Our study used 2D human neuronal cultures that allowed the accelerated discovery of functional differences at the single-cell level in the brain of normal individuals compared to those with AS,” explains Hyunsoo Shawn Je, the senior author of the study. “The use of mini 3D human brains allowed us to monitor spontaneous network activities, linking the results of abnormal firing from individual neurons and convulsive-like activities, just like those observed in the brains of AS patients.”

Julie Smith

I am a journalist with extensive experience working with different organizations in Kentucky, starting out as an editor with The Paducah Sun and later joining The Louisville Times. I am very happy to have joined Jubobarta News as a volunteer contributor, and submit research and content during my spare time. I am a long term subscriber to Nature and Scientific American, and frequently read up on new scientific research.

1263 Cerullo Road, Louisville Kentucky, 40244
502-375-7899
[email protected]
Julie Smith
Continue Reading

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