Gloria Deo 愿荣耀归上帝 Gloria Deo 愿荣耀归上帝 - Could affect its chances for life” (Astrobiology Magazine): 14 uses of the... 1 ... 10 11 12 13 14 15 16 17 ... 50

Gloria Deo 愿荣耀归上帝 Gloria Deo 愿荣耀归上帝 - Could affect its chances for life” (Astrobiology Magazine): 14 uses of the...

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Sana26.05.2018
Hajmi501 b.

Gloria Deo 愿荣耀归上帝

  • Gloria Deo 愿荣耀归上帝



Silently, fossils speak from the earth, requiring translation and interpretation by humans who didn’t see when they were laid to rest.

  • Silently, fossils speak from the earth, requiring translation and interpretation by humans who didn’t see when they were laid to rest.

  • Beetle bling:  The shiny blue scales of a weevil are still visible in a fossil after 49 million years, New Scientist claimed.



Tar pit puzzle:  “The La Brea Tar Pits have stirred the imaginations of scientists and the public alike for over a century,” Science Daily writes. “But the 

amount of time it took for ancient animals to become buried

 in asphalt after enduring their gruesome deaths has 

remained a mystery

.”  Researchers found insect traces on the sesamoid bones and phalanges of herbivores, leading them to conclude the carcasses were exposed to the air for 17–20 weeks.  Surprisingly, “Although 

carnivorans vastly outnumber the amount of mammalian herbivorans

 excavated from the tar pits, 

no insect damage was found on their bones

.”  Science Now’s coverage included this typo: “fossils like this 35,000-foot bone of a prehistoric horse,” probably intending 35,000 years, not 35,000 feet; that would be a pretty big horse otherwise.  The original paper is in PLoS One.
  • Tar pit puzzle:  “The La Brea Tar Pits have stirred the imaginations of scientists and the public alike for over a century,” Science Daily writes. “But the 

    amount of time it took for ancient animals to become buried

     in asphalt after enduring their gruesome deaths has 

    remained a mystery

    .”  Researchers found insect traces on the sesamoid bones and phalanges of herbivores, leading them to conclude the carcasses were exposed to the air for 17–20 weeks.  Surprisingly, “Although 

    carnivorans vastly outnumber the amount of mammalian herbivorans

     excavated from the tar pits, 

    no insect damage was found on their bones

    .”  Science Now’s coverage included this typo: “fossils like this 35,000-foot bone of a prehistoric horse,” probably intending 35,000 years, not 35,000 feet; that would be a pretty big horse otherwise.  The original paper is in PLoS One.


Transitional fleas:  “Fleas are a group of highly specialized blood-feeding 

ectoparasites whose early evolutionary history is poorly known

,” begins a paper in Current Biology by paleontologists from Russia, China and London.  They claim to have found Cretaceous fossils that “greatly improves our understanding of the morphological 

transition

 to the 

highly specialized body plan

 of extant fleas.”  The claim they are transitional relates primarily to gonad size, body size, and patterns of stiff body hairs.  Since they have all the flea parts, though, the fossils could represent greater diversity in the past: “The new fossils, in conjunction with previous discoveries, 

highlight a broad diversity of ectoparasitic insects

 in the mid-Mesozoic.”
  • Transitional fleas:  “Fleas are a group of highly specialized blood-feeding 

    ectoparasites whose early evolutionary history is poorly known

    ,” begins a paper in Current Biology by paleontologists from Russia, China and London.  They claim to have found Cretaceous fossils that “greatly improves our understanding of the morphological 

    transition

     to the 

    highly specialized body plan

     of extant fleas.”  The claim they are transitional relates primarily to gonad size, body size, and patterns of stiff body hairs.  Since they have all the flea parts, though, the fossils could represent greater diversity in the past: “The new fossils, in conjunction with previous discoveries, 

    highlight a broad diversity of ectoparasitic insects

     in the mid-Mesozoic.”


Transitional limbs:  According to Science Daily, Yale scientists studied living mudskippers and salamanders to infer the evolutionary transition to land-based locomotion.

  • Transitional limbs:  According to Science Daily, Yale scientists studied living mudskippers and salamanders to infer the evolutionary transition to land-based locomotion.

  • Why did animals with limbs win the race to invade land

     over those with fins? A new study comparing the 

    forces acting on fins

     of mudskipper fish and on the 

    forelimbs of tiger salamanders

     can now be used to analyze early fossils that spanned 

    the water-to-land transition

     in 

    tetrapod evolution

    , and further understand their capability to move on land.
  • They measured the forces on limbs and fins of the living animals, thinking it would help explain the motions of the dead:



Sandy Kawano said: “

The transition from fins to limbs marks the most dramatic change

 in orientation of the locomotor forces from contact with the ground. Using these data 

we can now evaluate the locomotor capabilities of numerous important fossil taxa

 that spanned the water-to-land transition in tetrapod evolution. 

We hypothesise

 that the medial orientation of the 

forces

 on pectoral fins 

would result in unreasonably high bone stresses in early amphibious fish with fins

, which would explain 

why the evolutionary invasion of land

 by vertebrates 

was accomplished instead by tetrapods with limbs with digits.

  • Sandy Kawano said: “

    The transition from fins to limbs marks the most dramatic change

     in orientation of the locomotor forces from contact with the ground. Using these data 

    we can now evaluate the locomotor capabilities of numerous important fossil taxa

     that spanned the water-to-land transition in tetrapod evolution. 

    We hypothesise

     that the medial orientation of the 

    forces

     on pectoral fins 

    would result in unreasonably high bone stresses in early amphibious fish with fins

    , which would explain 

    why the evolutionary invasion of land

     by vertebrates 

    was accomplished instead by tetrapods with limbs with digits.





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