सामयिक विषय: Scientific

Three new toad species found in US

Discovery of 3 new species of Frog

Question- Recently, Scientists of which of the following Universities discovered three new species of Toad in the US-based Great Basin of Nevada?
(a) University of Alabama
(b) University of Arizona
(c) University of Nevada
(d) Arakansas University
Ans: (c)
Related facts:-

  • According to a paper published in the July 6, 2017 issue of the journal Zootaxa, A team of researchers of the University of Nevada has discovered three new toad species in the Great Basin region of northern Nevada.
  • The team was led by Professor C. Richard (Dick) Tracy.
  • The three new species have been named as the Dixie Valley toad (Bufowilliamsi), the Railroad Valley toad and the Hot Creek toad.
  • They are small in size with a suite of unique physical features that separate them from each other, as well as other toads in the region. They are about 2 inches long when full grown.
  • These are estimated to be separated from other populations for 650,000 years.

Related Links:-
http://www.sci-news.com/biology/three-new-toad-species-nevada-05068.html
http://www.thehindu.com/todays-paper/tp-in-school/three-new-toad-species-found-in-us/article19352661.ece

A new species of glow-in-the-dark shark

A new species of glow-in-the-dark shark

Question:- A new species of glow-in-the-dark shark recently identified by scientists belongs to …
(a) lantern shark family
(b) Arrow tooth eel
(c) Bengal danio
(d) Bigmouth buffalo
Answer:- (a)
Related facts:-

  • Scientists have discovered new species of glow-in-the-dark shark living 1,000 feet below the Pacific Ocean off the coast of the northwestern Hawaiian islands.
  • It has been named Etmopteruslailae and belongs to lantern shark family.
  • It has an unusually large nose, weighs a little less than a kilo and measures less than a foot.
  • This unique features and characteristics make it different from other lantern sharks.
  • Etmopteruslailae has a strange head shape which is large and bulgy snout where its nostrils and olfactory organs are located. It dwells in a deep sea environment with almost no light so it has big sniffer to find food.
  • It has flank markings that go forward and backward on their bellies and a naked patch without scales on the underside of its snout.
  • Like other lantern sharks, it is also bio-luminescent. Its flanks on the bottom of its belly glow in the dark. The markings on its belly and tail also are specific to it

Reference:
http://www.thehindu.com/sci-tech/science/glow-in-the-dark-shark-discovered-in-the-pacific/article19366045.ece
http://www.newsweek.com/weird-glow-dark-shark-tiny-body-and-massive-nose-discovered-1000-feet-below-642274

NASA jets for first time will chase solar eclipse

NASA jets for first time will chase solar eclipse

Question:-By which of the following NASA’s research jets scientists are planning to chase the shadow of the moon during the upcoming total solar eclipse in the U.S. ?
(a) WB-56E
(b) WB-57F
(c) WC-58E
(d) WC-56F
Answer:- (b)
Related facts:-

  • Scientists from NASA for first time are planning to chase the shadow of the moon during total solar eclipse on August 21, 2017.
  • This task will be performed using two of NASA’s WB-57F research jets during the upcoming total solar eclipse in US.
  • The purpose of the chase is to capture the clearest ever images of the Sun’s outer atmosphere.
  • The research jets (planes) will have twin telescopes mounted on the noses of the planes to capture clearest images of Sun’s corona to date.
  • They will also undertake first-ever thermal images of Mercury to reveal how temperature varies across the planet’s surface.
  • The total solar eclipse will provide rare opportunity for scientists to study the sun, particularly its atmosphere. During this eclipse, moon will completely cover the sun and perfectly blocking its light so that faint corona is easily seen against the dark sky.
  • The two research planes will observe the total eclipse for about three and a half minutes each. The vantage point on planes will provide distinct advantages over ground-based observations.
  • The planes will also take observations of Mercury 30 minutes before and after sky is still relatively dark. These images will be taken in the infrared and will be the first attempt to map the variation of temperature across the surface of the planet.
  • The planes will be flying high in the stratosphere to avoid Earth’s atmosphere for improving image quality. The sky will be also 20–30 times darker at the altitude where planes will be flying than as seen from the ground.
  • There is also much less atmospheric turbulence, that will allow fine structures and motions in sun’s corona to be visible.

Reference:
https://www.nasa.gov/feature/goddard/2017/chasing-the-total-solar-eclipse-from-nasa-s-wb-57f-jets

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