Sentences with word «spherule»

We never have seen such a dense accumulation of spherules in a rock outcrop on Mars.»

«The extremely high proportion of more than 60 percent spherules in certain parts of the river is striking.

The sediments also contain metallic and carbon spherules, as well as melted charcoal, likely the result of forest fires that swept the continent after the impact.

Distinctive silicate glass spherules found in rock dating to this warm period, called the Paleocene - Eocene Thermal Maximum or PETM, may be debris ejected during a meteorite impact, say the scientists.

Once inhaled, the spores grow into spherules (parasitic cycle) which continue to enlarge until they burst, releasing hundreds of endospores.

The New Jersey cores were dug with rotary drills, and there's abundant contamination in the samples, along with many spherules dating to impacts from different eras.

The researchers found microplastics in the shape of opaque and transparent spherules as well as of fragments and fibers.

Such spherules are, in fact, often seen in ancient strata.

They realized that giant impacts would melt rocks and create distinctive glass spherules unlike anything created by a volcano or any other terrestrial process.

CT scans have also revealed smaller iron - rich spherules resembling «blueberries,» the iron - oxide concretions discovered on Mars a decade ago by the Opportunity rover and thought to have precipitated out of water.

Blueberry Spherules - «Blueberries,» ancient mineral deposits about an eighth of an inch wide, dot many areas.

They found that the AMD samples contained tiny spherules of a mineralized calcium phosphate known as hydroxyapatite, or HAP.

The team is convinced the glassy spherules weren't erupted from a volcano — another way they could have been made.

Researchers reporting in the journal Geoarchaeology discovered that the interior of the container, which was found at an archaeological site on southern Baffin Island, contains fragments of bronze as well as small spherules of glass that form when rock is heated to high temperatures.

The ChemCam image also shows millimeter - size spherules of unknown origin, not seen in most earlier sedimentary rocks.

A detailed molecular understanding of the assembly, structure and function of the RNA replication spherules is essential to find novel drug targets to inhibit the replication and spread of positive - strand RNA viruses.

These arthroconidia are inhaled into the lungs where they change into round spherules (like the yeast form of Blasto).

Newly emerged adults produce spherules.

Training more geologists to think in terms of impacts and look for layers of spherules should also make a huge difference; there may still be a lot of evidence lying around that simply has not been collected and analyzed.

These spherules, dubbed dinosaur eggs, could be the fundamental building blocks that clumped together to form the comet 4.5 billion years ago.

Finding the spherules is only step one, however.

A sample from the Rhine near Duisburg consisting of over 65 % opaque spherules in 15-fold magnification; the spherules have a diameter of 400 — 900 micro meters.

Then there is the matter of calculating the ages of the spherules, which involves the separate, delicate art of radioactive dating.

Next is the tedious work of identifying the companion chemical signatures of an asteroid impact, such as the element iridium, alongside the spherules.

It was evocative of the lunar breccias Agee recalled from the Apollo days — except that Black Beauty's spherules were much more diverse.

The edges of these veins and spherules would all be good places to look for organic signals, says Andrew Steele, a biogeochemist at the Carnegie Institution for Science in Washington, D.C., who is probing the rock for organics.

After four days of incubation, the spherule pops open, releasing about 100 spores, and the the process repeats.

Once inside the lungs, the microscopic fungal spore transforms into a spherule (pictured), a podlike structure 10 to 20 times the size of the original spore (30 or 40 microns, or about half the width of a human hair).

The spherules, known as microtektites, are droplets of molten rock that were melted and thrown out of the impact crater by the energy of the projectile, or condensed from rock that was vaporized upon impact.

Earlier research efforts in the same area of the Atlantic may not have detected these spherules for a variety of reasons, Schaller says, including the difficulty associated with detecting these translucent to dark - colored objects on a dark background like a black lab tray.

«The real icing on the cake,» Schaller continued, «was the identification of shocked quartz inclusions in our spherules... a sign of an impact event.»

I then spotted the spherules.

The spherules they captured were recovered from four sites extending from the southern New Jersey coast to the coast of Florida.

News of the spherules has bounced around the community of PETM researchers for months, says Ellen Thomas, a geologist at Wesleyan University in Middletown, Connecticut.

Furthermore, a statement about the spherules» chemistry has been clarified to show that they are different from microtektites from other impacts.

But she is perplexed because she has since re-examined several different PETM cores from New Jersey and has not found any spherules; similarly, she has never seen them in global samples.

If the team successfully dates the spherules to the start of the PETM, she will consider it real evidence of an impact.

In the Ahlquist lab, I work with another member of the family — Flock House Virus (FHV)-- to study how FHV modifies the mitochondrial membranes to form RNA replication complexes called «spherules».

Coils contain 33 % more protein than spherules.

Spherules are round and 0.07 - 0.25 mm in size.

Flea excrete feces in two different forms: Spherules and coils.

The spherules are thought to be preferred by young larvae, while the protein - rich coils are more suitable for 3rd instars.

Due to the slow percolation of water through each spherule, anaerobic actions can occur and nitrates are removed.

Directly beneath the black mat, researchers found high concentrations of magnetic grains containing iridium, charcoal, soot, carbon spherules, glass - like carbon containing nanodiamonds and fullerenes packed with extraterrestrial helium — all of which are evidence for an extraterrestrial impact and the raging wildfires that might have followed.

«Based on a data archive, each spherule in the picture represents a real existing object orbiting in space,» Najjar says.