搜索结果: 16-30 共查到“海洋科学 diatoms”相关记录33条 . 查询时间(0.173 秒)
Ultraviolet radiation negatively affects growth but not food quality of arctic diatoms
Ultraviolet radiation negatively affects growth food quality arctic diatoms
2014/4/23
We studied the short-term effects of ultraviolet radiation (UV radiation, 280-400 nm) on the fatty acid composition and cellular stoichiometry of three dominant arctic diatom species (Thalassiosira an...
Release of dissolved organic matter by coastal diatoms
Release of dissolved organic matter coastal diatoms
2014/4/23
Dissolved organic matter (DOM) production was examined in axenic batch cultures of five coastal diatom species. For Chaetoceros decipiens, dissolved organic carbon (DOC) accumulated beginning in late ...
Copper-dependent iron transport in coastal and oceanic diatoms
Copper-dependent iron transport in coastal oceanic diatoms
2014/5/4
We investigated the presence of plasmalemma-bound copper-containing oxidases associated with the inducible iron (Fe) transport system in two diatoms of the genus Thalassiosira. Under Fe-limiting condi...
Decadal basin-scale changes in diatoms, dinoflagellates, and phytoplankton color across the North Atlantic
Decadal basin-scale changes diatoms dinoflagellates and phytoplankton color the North Atlantic
2014/5/9
The Continuous Plankton Recorder (CPR) survey has been used to characterize phytoplankton and zooplankton space-time dynamics in the North Sea since 1931 and in the North Atlantic since 1939. Phytopla...
Extracellular production of superoxide by marine diatoms: Contrasting effects on iron redox chemistry and bioavailability
Extracellular production of superoxide marine diatoms Contrasting effects iron redox chemistry and bioavailability
2014/5/9
We report the extracellular production of superoxide in cultures of the marine diatoms Thalassiosira weissflogii and Thalassiosira pseudonana. In EDTA-buffered media with ~45 pmol L-1 iron (Fe)(III)',...
Copper requirements for iron acquisition and growth of coastal and oceanic diatoms
Copper requirements for iron acquisition growth of coastal oceanic diatoms
2014/5/9
Centric diatoms isolated from open ocean environments require higher concentrations of Cu for growth than their coastal counterparts. In artificial seawater medium containing <1 nmol L-1 Cu, three coa...
Domoic acid: The synergy of iron, copper, and the toxicity of diatoms
The synergy of iron copper
2014/5/13
Diatom blooms generated by the alleviation of iron limitation in high nitrate–low chlorophyll (HNLC) regions
of the oceans often are composed of pennate diatoms of the genus Pseudo-nitzschia, many of...
Life history responses of Daphnia pulicaria to diets containing freshwater diatoms: Effects of nutritional quality versus polyunsaturated aldehydes
Daphnia pulicaria diets containing freshwater diatoms nutritional quality polyunsaturated aldehydes
2014/5/9
Like marine diatoms, some freshwater diatoms produce α, β, γ, δ-polyunsaturated aldehydes (PUA) when damaged. Some of these oxylipins are suspected of impairing egg viability in marine copepods. To de...
Growth rates, half saturation constants, and silicate, nitrate, and phosphate depletion in relation to iron availability of four large open-ocean diatoms from the Southern Ocean
Growth rates half saturation constants silicate, nitrate phosphate depletion relation to iron availability four large open-ocean diatoms Southern Ocean
2014/5/19
Four large, open-ocean diatoms from the Southern Ocean (Actinocyclus sp., Thalassiosira sp., Fragilariopsis kerguelensis, and Corethron pennatum) were grown in natural (low iron) Southern ocean seawat...
A role for manganese in superoxide dismutases and growth of iron-deficient diatoms
superoxide dismutases iron-defi cient diatoms
2014/5/19
We have discovered that coastal and oceanic diatoms require more manganese (Mn) to grow in iron (Fe) -deficient
than in Fe-sufficient seawater. At low inorganic concentrations, like those...
Recruitment of coastal planktonic diatoms from benthic versus pelagic cells: Variations in bloom development and species composition
planktonic diatoms benthic vs pelagic cells Variations in bloom development species composition
2014/5/19
Although phytoplankton blooms are major events in aquatic systems, the importance of benthic resting stages in seeding planktonic blooms is still unclear. Using microcosms, we tested the influence of ...
Daphnia can protect diatoms from fungal parasitism
Daphnia protect diatoms fungal parasitism
2014/5/14
Many phytoplankton species are susceptible to chytrid fungal parasitism. Much attention has been paid to abiotic factors that determine whether fungal infections become epidemic. It is still unknown, ...
Evidence for constant and highly specific active food selection by benthic ciliates in mixed diatoms assemblages
Evidence benthic ciliates
2014/5/14
Observational and experimental studies have shown that phagotrophic ciliates are highly selective predators.
However, little is as yet known about the actual mechanisms involved in prey selection. We...
Effect of large marine diatoms growing at low light on episodic new production
large marine diatoms growing low light episodic new production
2014/5/20
Mesoscale eddies have been shown to be a common feature of open ocean regions such as the Sargasso Sea. By lifting nutrients up to the lower portions of the euphotic zone, these eddies can cause episo...
CO2 and HCO3- uptake in marine diatoms acclimated to different CO2 concentrations
CO2 and HCO3- uptake marine diatoms different CO2 concentrations
2014/6/9
Rates of cellular uptake of CO2 and HCO3- during steady-state photosynthesis were measured in the marine diatoms Thalassiosira weissflogii and Phaeodactylum tricornutum, acclimated to CO2 partial pres...