Research links evolution of fins and limbs with that of gills
... program that we have traced back to formation of gills
in sharks," said Andrew Gillis, lead author of ... that fins and (later) limbs evolved from the gills
of an extinct vertebrate, Gillis added. "A dearth ... Gillis said. "Perhaps we should think of shark gills
as another type of vertebrate appendageone that's ...
Red-eyed treefrog embryos actively avoid asphyxiation inside their eggs
... by behaviorally positioning their external gills
in a small high-oxygen area, a sweet spot near ... turned the embryos within the eggs so that the gills
were positioned away from the surface, in lower ...
Rogge also induced embryos to lose their gills
in the egg -- and was thus able to directly ...
What causes cell defenses to crumble?
... of an active, physiological barrier in mussel gills
that protects them against environmental ... ) can pump over 20 litres of water through their gills
every hour. The active barrier protects the ... water. The presence of such proteins in mussel gills
has been previously indicated, but it is only now ...
Coral reef fish harbor an unexpectedly high biodiversity of parasites
... class of monogeneans (Monogenea). They live on gills
of marine fish where they find both refuge and ... 800 specimens of monogeneans collected from gills
of 10 individuals of this fish allowed biologists ... identified among more than 300 collected from the gills
of two malabar specimens The existence of a rich ...
April 2009 Geology and GSA Today media highlights
... out how to breathe. No longer bathed in oxygen-rich marine waters, their gills
would surely have dried out. Hagadorn and Seilacher have analyzed fossils ... this was that the shell may have acted as a humid chamber to keep their gills
moist. This would have allowed brief forays out of the water, to explore ...
Study shows transfer of heavy metals from water to fish in Huelva estuary
... a lower correlation in the case of the sole, which tends to be a bottom dweller, although it also contained lead. Zinc and cadmium appeared in the gills
and muscles, but above all in the liver, where copper was also detected at high concentrations.
This research forms part of the project ...
Resilin springs simplify the control of crustacean limb movements
... acquisition and sampling. It may also allow an assessment of the amount of particulate matter in the exhalent current that might indicate that the gills
need cleaning. Second, as an active communication and signaling mechanism; the currents created distribute odor molecules in the urine released into ...
Fossil fragments reveal 500-million-year-old monster predator
... the modern arthropods such as their head structures and limbs. As well as its bizarre frontal carapace, Hurdia reveals exquisite details of the gills
associated with the body, some of the best preserved in the fossil record.
"Most of the body is covered in the gills, which were probably ...
Cretaceous octopus with ink and suckers -- the world's least likely fossils?
... preserve the octopuses' eight arms with traces of muscles and those characteristic rows of suckers. Even traces of the ink and internal gills
are present in some specimens. 'These are sensational fossils, extraordinarily well preserved' says Dirk Fuchs of the Freie University Berlin, lead ...
Haag honored with Presidential Early Career Scientists Award
... has been central in revealing the fascinating life histories of mussels. Because their larvae must spend a brief period of time as parasites on the gills
of fishes, mussels have developed strategies to attract host fishes and infect them with larvae. These strategies include displaying elaborate lures ...
Ocean acidification from CO2 emissions will cause physiological impairment to jumbo squid
... sensitivity allows the squids to off-load oxygen more effectively to muscle tissues, but would prevent the squid from acquiring oxygen across the gills
from seawater that is high in CO 2 ."
While many other squid and octopus species have oxygen transport systems that are equally sensitive to pH, few ...
Academy participates in project to discover drugs, biofuels in tropical seas
... and the scourge of wooden structures in estuarine and marine habitats worldwide. A relative of the clam, these animals host bacteria inside their gills
that produce enzymes to help them digest wood and may prove useful for converting cellulosic biomass into biofuels.
Discovering drugs, biofuels in tropical seas
... in estuarine and marine habitats worldwide, are the focus of the third aim. A relative of the clam, these animals host bacteria inside their gills
that produce enzymes to help them digest wood and may prove useful for converting cellulosic biomass into biofuels. Cellulosic ethanol can be ...
Colorful view for first land animals
... these have more in common with four-legged vertebrates (tetrapods) than with fish retinas.
Although lungfish mainly take in oxygen through their gills
like most fish, they can also breathe air if water quality is poor. Lungfish were previously thought to have poor eyesight due to their small eyes, ...
First finding of a metabolite in 1 sex only
... female halves. After the crab died, Lipcius sent Kleps gill tissue from each side for analysis. The measured levels of AEP from the male and female gills
provided additional evidence that AEP is a sex-specific compound.
"Since both sides of this strange crab have, of necessity, shared a diet and ...
Thin tough skin, slow-growing gills protect larval Antarctic fish
... but hardy, unblemished skin and slow developing gills
appear to be keys to survival for newly hatched ... more closely, the researchers discovered that the gills
of all three species were undeveloped at ... the larval fish must rely only on their skin and gills
to prevent ice from entering, and to keep them ...
Precision biochemistry tracks DNA damage in fish
... PNRI used an infrared spectroscopy method to document DNA damage in the gills
of English sole.
In a new joint paper, the researchers report on ... of DNA and measurements of specific modifications to DNA from fish gills
and livers using liquid and gas chromatography combined with mass ...
Salamanders suffer delayed effects of common herbicide
... larvae to either 4, 40, or 400 parts per billion of atrazine until metamorphosis, the stage where the water-dwelling salamanders lose their gills
and develop lungs that enable them to breathe in air. Scientists then tracked their survival to near reproductive age.
Results from the study, ...
Virus may control Australia's
... areas of south-eastern Australia carp make up more than 85 per cent of the fish in the rivers and creeks.
"The virus works by attacking the carp's gills
as well as other vital organs and eventually killing its host. Koi herpesvirus is attractive as a biological control agent as overseas studies ...
Don't hold your breath: Carp can manage without oxygen for months
... for Experimental Biology on Friday 7th April [session A9].
The researchers have found that this extraordinary fish can change the structure of its gills
to avoid becoming anoxic. In addition its blood has a much higher affinity for oxygen than any other vertebrate, and it makes tranquilizers and ...