Sentences with word «diatom»

«There are 2,500 species of diatoms in India alone,» says Balasubramanian, who is writing his doctoral thesis on these algae.

A new mechanism for emplacement and concentration of diatoms in subglacial deposits.

When hard - shelled algae called diatoms fossilize, they create a sedimentary rock that is easy to crumble called diatomaceous earth.

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

Might be some proxy for total primary productivity, or biomass, or respiration, or photosynthesis, or chemistry of diatom shells or lack thereof in each slice of the sediment core.

According to Ingall, removal of iron by diatom - dominated phytoplankton communities may dampen the intended outcome of enhanced carbon uptake through iron fertilization by reducing the productivity of other phytoplankton, which take up carbon dioxide more efficiently.

Paleo - reconstructions of sea ice are often based on fossil assemblages of marine diatom species found in association with sea ice (see Fig. 2).

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

Our results support the use of short - term manipulative experiments spanning weeks as proxies to understand the potential effects of global change forcing on diatom community structure over longer timescales such as years.

Diatomaceous earth is a chalky powder of fossilized diatoms.

J. Craig Venter Institute - led team awarded $ 10.7 M by DOE to boost lipid production in diatoms for next - gen biofuels and bioproducts

We incubated a natural diatom community from coastal New Zealand waters in a short - term incubation experiment using a factorial matrix of temperature and CO2, and measured effects on community structure.

DE contains Diatoms which are one celled microscopic algae whose walls consist of two parts and contain a mineral called silica.

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

«The analysis shows that diatoms make up the most important source of carbon for polar cod,» explains Kohlbach.

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.

When diatoms bloom, they can impede copepod reproduction and may even disrupt the marine food chain, the study suggests.

The cores showed a significant increase in planktonic diatoms beginning in the early 1960s, a finding consistent with the observed increase in air temperatures and reduction in wind speed in recent decades.

Other proxies include ice cores, tree rings, and sediment cores (which include diatoms, foraminifera, microbiota, pollen, and charcoal within the sediment and the sediment itself).

The project relies on the one hand on having a robust chronology to correlate the cores and to link the events with global climate histories, and on the other hand being able to quantify diatom assemblages in the sediment and relate them to oceanic conditions.

The El Junco diatom index record from the Galápagos Islands (0 ° 54»S, 89 ° 29 «W, 43) and the fossil - coral oxygen isotopic records from Palmyra Island (6 ° N, 162 ° W, 44) constitute ENSO - sensitive proxy records from the equatorial Pacific against which we compared our results.

The researchers propose creating a biological solar panel, which will contain diatoms instead of photovoltaic cells.

But we argue here that only small (2 nM) increases in the iron concentration in source waters of the upwelling Equatorial Undercurrent are needed to fuel intense diatom production across the entire eastern equatorial Pacific Ocean.

However, elevated atmospheric CO2 concentrations and ocean acidification may also have an adverse impact on diatom growth, causing a decrease in cell size and possible further changes in phytoplankton composition.

But he notes that others have not seen as dramatic a decrease in copepod reproductive success during diatom blooms elsewhere and warns that the Adriatic's heavy pollution may have enhanced the effect.

So many diatoms died, in fact, that they overwhelmed any natural systems for decay and fell in large numbers below 500 meters in depth.

Chaetoceros atlanticus, Corethron pennatum, Thalassiothrix antarcticus and nine other species of diatoms grew in abundance, boosting the amounts of chlorophyll, organic carbon and other signs of life in the waters to depths of as much as 100 meters beneath the surface.

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.

These results are in accordance with observations from short - term natural diatom community experiments [10,12], where temperature exerted a stronger influence than pCO2, but statistically pCO2 was still a contributor to observed effects.

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.

Variability measures applied to NADA PDSI, El Junco diatoms, Palmyra isotopes, and modeled precipitation from CESM were developed from the original, raw time series.

Cold water diatoms adhere to their skin and sometimes give their bellies a yellowish tinge, giving the blue whale its nickname of «sulfur bottom.»

That creates more acidification, which kills off more diatoms?

This methodology has been used for other CO2 experiments [21,30,31], including previous diatom studies [10,16,20].

If diatoms could be made to similarly secrete the oil they produce, then it could be easily harvested.

Scherer would later find dozens of crushed diatom shells in his samples — possible remnants of microscopic aquatic organisms from when the site of Lake Whillans was a shallow seafloor.

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.»

Application of the modern analog technique to marine Antarctic diatoms: Reconstruction of maximum sea ice extent during the Last Glacial Maximum

The second core showed a shift in other diatoms in the second lake around the same time in favor of species that thrive in warming temperatures.

The researchers also studied variables related to other ocean plant groups, like diatoms, which build glass shells that carry carbon to the deep sea, sequestering it from the atmosphere.

HITCHHIKER A microscopic diatom latches onto a tiny plastic piece from the Sargasso Sea (colors added).