Sentences with phrase «at diatoms»

Another person, brought in to work on a project on unicellular algae, had «never looked at diatoms before he came here,» explains Gibby, but «he was very good at diving... he had to be able to dive to collect the specimens.»

During this cruise we are looking at the diatom species currently living in the surface waters in order to develop our understanding of their habitats.

Not exact matches

As an IIE - SRF fellow at the University of Gothenburg, Al - Handal is again able to use his expertise in taxonomy of marine diatoms, a type of microalgae, with the added advantage of direct access to a scanning electron microscope, which he didn't have in Iraq.

At that time, there were lots of nutrients in the ocean water there, because small organisms called diatoms, which have silica shells, were able to thrive.

Bacteria and diatoms inhabit those liquid veins, and Hajo Eicken, a glaciologist at the University of Alaska at Fairbanks, suspects that similar habitats could exist in the lower, warmer layers of ice on Europa, and perhaps on the other moons as well.

He spotted the glassy shards of ancient diatom shells — the remains of microscopic phytoplankton that lived here at warmer times in the past, when a shallow sea covered much of West Antarctica.

To bury carbon at sea requires promoting particular species in the bloom, such as diatoms — shelled algae.

In a presentation at a recent ocean acidification conference, Tatters reported that the more CO2 and the less silicate, the higher the diatom's toxin production — more than doubling at the level of dissolved CO2 scientists expect the oceans to reach by 2100.

A new study shows that at least two diatom species make compounds that reduce hatching rates when eaten by tiny shrimplike animals called copepods.

At the University of Alaska Fairbanks, Matthew Wooller and colleagues will analyze the mud for the remains of diatoms, water fleas and other tiny life to learn about the water temperature and clarity over time.

One beneficiary of this young researcher exchange program was Matthew Julius, who studies the evolution of diatoms, a group of microscopic algae, now at St. Cloud State University in Minnesota.

Fresh diatom cell corpses littered the seafloor as well, and the research team believes that much of the bloom ended at the bottom as a layer of fluff.

At present, scientists have no way to ensure that the desired species of silica - shelled diatoms bloom.

Scientific analysis of diatom oil has shown that it is very suitable for use as biofuel, says T. V. Ramachandra, a professor of ecological sciences at the Indian Institute of Science (IISc) here who is working on this project with IISc researchers Durga Mahapatra and Karthick Balasubramanian, along with Richard Gordon, a radiology professor at the University of Manitoba in Winnepeg.

As he and his collaborators put it, «with at least a boundary layer of water on the diatoms, secreted oil droplets would separate under gravity, rising to the top of a tilted panel forming an unstable emulsion, which should progressively separate.

«Without the existence of these proteins that could help phytoplankton cope in these stressful environments, the phytoplankton diversity in many regions of the ocean would be much lower, in particular by reducing large phytoplankton such as diatoms that are known to take up a lot of carbon dioxide, thus possibly accelerating the pace of a warming planet,» said Marchetti, assistant professor of marine science at UNC - Chapel Hill.

As part of the study, Bloom, now an assistant professor at Illinois State University, developed a mathematical model to reconstruct drought over thousands of years using diatoms.

These microfossils accumulate in the lake sediments and due to the fact that different species require different environmental conditions, lots can be learned about the environment at the time the lake sediments were deposited from the diatom fossil assemblage.

Updated, 10:41 p.m. At the asterisk above, I originally used diatoms as a synonym for coccolithophores.

We assess atmospheric versus oceanic influences on glacial discharge at this location, using analyses of diatom geochemistry to reconstruct atmospherically forced glacial ice discharge and diatom assemblage ecology to investigate the oceanic environment.

As evolving diatom populations expanded, a more efficient biological pump buried more CO2 at depth that is now detected as siliceous ooze or as biogenic opal deposits.

Langenburg seems to contradict Verbums finding that diatoms are an indicator for Lake Tanganyika productivity stsating picocyanobacteria may at times be the dominant form of phytoplankton.

At any rate, when «normal» rain containing natural carbonic acid falls upon silicon - containing sedimentary rocks formed over eons from the shells of tiny marine creatures — radiolarians, diatoms and some sponges — this «siliceous» rock combines with the carbonic acid to form ions of bicarbonate.

The Antarctic ice sheet reached the coastline for the first time at ca. 33.6 Ma and became a driver of Antarctic circulation, which in turn affected global climate, causing increased latitudinal thermal gradients and a «spinning up» of the oceans that resulted in: (1) increased thermohaline circulation and erosional pulses of Northern Component Water and Antarctic Bottom Water; (2) increased deep - basin ventilation, which caused a decrease in oceanic residence time, a decrease in deep - ocean acidity, and a deepening of the calcite compensation depth (CCD); and (3) increased diatom diversity due to intensified upwelling.

report that ocean sediment cores containing an «undisturbed history of the past» have been analyzed for variations in PP over timescales that include the Little Ice Age... they determined that during the LIA the ocean off Peru had «low PP, diatoms and fish,» but that «at the end of the LIA, this condition changed abruptly to the low subsurface oxygen, eutrophic upwelling ecosystem that today produces more fish than any region of the world's oceans... write that «in coastal environments, PP, diatoms and fish and their associated predators are predicted to decrease and the microbial food web to increase under global warming scenarios,» citing Ito et al..

More locally, Moros et al. (2006) record substantial environmental changes in Disko Bugt sediments at w4 ka based on diatoms and sediment physical proxies.