Free Radicals and other reactive species in Disease
... Free radicals and other reactive species are constantly generated in the human body. Some are made by ‘accidents of chemistry’; for example, leakage of electrons directly on to O2 from the intermediate electron carriers of the mitochondrial electron transport chain generates a steady stream of O2. 2 ...
... Free radicals and other reactive species are constantly generated in the human body. Some are made by ‘accidents of chemistry’; for example, leakage of electrons directly on to O2 from the intermediate electron carriers of the mitochondrial electron transport chain generates a steady stream of O2. 2 ...
Biological Formation of Organic Substances from Particulate
... for formation of DOM from plant debris in soils or algal biomass in waters and/or sediments. Note that rates of superoxide production normalized to the proportion of metabolically active cells is detected to vary between 0.02 0.02 amol cell−1 hour−1 (mean ± standard error) and 19.4 5.2 amol cell ...
... for formation of DOM from plant debris in soils or algal biomass in waters and/or sediments. Note that rates of superoxide production normalized to the proportion of metabolically active cells is detected to vary between 0.02 0.02 amol cell−1 hour−1 (mean ± standard error) and 19.4 5.2 amol cell ...
marine ecology-final 2008 Lecture 8
... At depth (below photic zone), DOC derived mostly from sinking detrital material. ...
... At depth (below photic zone), DOC derived mostly from sinking detrital material. ...
Aerosol pollutants can have long-range effects on ocean oxygen
... ‘oxygen minimum zones’, and organisms that live within them require special adaptations in order to survive. Some of the world’s biggest oxygen minimum zones are found in the Pacific Ocean, where oxygen concentrations have decreased considerably in recent years. These are mostly formed naturally, al ...
... ‘oxygen minimum zones’, and organisms that live within them require special adaptations in order to survive. Some of the world’s biggest oxygen minimum zones are found in the Pacific Ocean, where oxygen concentrations have decreased considerably in recent years. These are mostly formed naturally, al ...
Life in the Oceanic Realms - Indian Academy of Sciences
... waters, relatively nutrient-poor open oceanic waters, coral reef atolls, metal-rich hydrothermal vent fluids with temperatures of 200-350oC, cold-seeps, estuaries, mangrove swamps, intertidal beaches and rocky shores. Oceans are home to some of the most diverse and unique life forms. This article is ...
... waters, relatively nutrient-poor open oceanic waters, coral reef atolls, metal-rich hydrothermal vent fluids with temperatures of 200-350oC, cold-seeps, estuaries, mangrove swamps, intertidal beaches and rocky shores. Oceans are home to some of the most diverse and unique life forms. This article is ...
PICES XV S9-2846 Poster The role of temperature, salinity, light
... ammonium or 20 M urea as the sole nitrogen source. Experiments conducted at high (120 µE·m-2·s-1) and low (40 µE·m-2·s-1) photosynthetic photon flux densities (PPFDs), demonstrate that P. cuspidata grew significantly faster at high PPFD, but showed no preference for one nitrogen source over the oth ...
... ammonium or 20 M urea as the sole nitrogen source. Experiments conducted at high (120 µE·m-2·s-1) and low (40 µE·m-2·s-1) photosynthetic photon flux densities (PPFDs), demonstrate that P. cuspidata grew significantly faster at high PPFD, but showed no preference for one nitrogen source over the oth ...
Marine Primary Productivity: Measurements and Variability
... primary producers. Primary producers however, immediately respire some of the organic matter they make to meet their own energy needs, so it is not available as food to other organisms. We are more interested, however, in Net primary production, which is the organic matter that is left over or the c ...
... primary producers. Primary producers however, immediately respire some of the organic matter they make to meet their own energy needs, so it is not available as food to other organisms. We are more interested, however, in Net primary production, which is the organic matter that is left over or the c ...
Harmful Algal Blooms in Southern Californian Waters
... food webs, a few are capable of producing substances that are noxious or toxic, resulting in illness and even death of marine life and occasionally humans who consume contaminated seafood. When microalgae create these conditions, we refer to them as harmful algal blooms (HABs). An older term often u ...
... food webs, a few are capable of producing substances that are noxious or toxic, resulting in illness and even death of marine life and occasionally humans who consume contaminated seafood. When microalgae create these conditions, we refer to them as harmful algal blooms (HABs). An older term often u ...
Lab/Fieldwork Activity Example
... plants present. The determination the chlorophyll a pigment, using the fluorimetric method, represents the most common method of assessing the production of phytoplankton in the sea. Color sensors on satellites also measure chlorophyll concentrations, however only of surface waters, and consecutive ...
... plants present. The determination the chlorophyll a pigment, using the fluorimetric method, represents the most common method of assessing the production of phytoplankton in the sea. Color sensors on satellites also measure chlorophyll concentrations, however only of surface waters, and consecutive ...
Algae in Fresh Water Ecosystem (PDF Available)
... of phytoplankton. Phosphorus (P) and Nitrogen (N) are often considered as the principal limiting nutrients for aquatic algal production (Cecilia, 2011 and Hutchinson, 1967). Generally aquatic ecosystems receive excess of this nutrient through untreated domestic sewage and agriculture runoff (Shinde ...
... of phytoplankton. Phosphorus (P) and Nitrogen (N) are often considered as the principal limiting nutrients for aquatic algal production (Cecilia, 2011 and Hutchinson, 1967). Generally aquatic ecosystems receive excess of this nutrient through untreated domestic sewage and agriculture runoff (Shinde ...
Fisheries Fact Sheet - Algae
... algae and photosynthetic bacteria. Although they all share similar habitats, seagrasses are the only true plants found in the marine environment. Algae lack the features of true flowering plants such as roots, stems and vascular tissue. Instead of roots, they anchor themselves to rocks or other orga ...
... algae and photosynthetic bacteria. Although they all share similar habitats, seagrasses are the only true plants found in the marine environment. Algae lack the features of true flowering plants such as roots, stems and vascular tissue. Instead of roots, they anchor themselves to rocks or other orga ...
reasssement of the photosynthetic quotient
... estimate that errois between 5-15% could commonly occur between oxygen and the 14C method due to the uncertainty over whether the 14C technique is measuring gross or net production and as such would be insufficient to be the principal cause of the high observed PQ values. Further support for this co ...
... estimate that errois between 5-15% could commonly occur between oxygen and the 14C method due to the uncertainty over whether the 14C technique is measuring gross or net production and as such would be insufficient to be the principal cause of the high observed PQ values. Further support for this co ...
harmful algae news - Woods Hole Oceanographic Institution
... there were many microscopic organisms but the most abundant was C. taylorii (Photo 2b). The cells of this species are peculiar with a really “unusual” aspect, as already pointed out [8-9]. The identification was not easy because this species is typical of coral reefs and its presence in the Mediterr ...
... there were many microscopic organisms but the most abundant was C. taylorii (Photo 2b). The cells of this species are peculiar with a really “unusual” aspect, as already pointed out [8-9]. The identification was not easy because this species is typical of coral reefs and its presence in the Mediterr ...
measurements of primary production in coastal sea water using a
... unrealistically high, and undesirable temperature increases usually occur. Furthcrmorc, no precise “balance” of dissolved oxygen or carbon dioxide can be readily computed when there is a large surface area of water in contact with the atmosphere. The thin plastic tube experiment proposed by Margalef ...
... unrealistically high, and undesirable temperature increases usually occur. Furthcrmorc, no precise “balance” of dissolved oxygen or carbon dioxide can be readily computed when there is a large surface area of water in contact with the atmosphere. The thin plastic tube experiment proposed by Margalef ...
Sampaga 1 A Comparison Between Megafaunal Presence and
... The deep sea is home to a variety of geological features such as abyssal plains, mid-ocean ridges, trenches, and submarine canyons. Barkley Canyon is a submarine canyon located off of the west continental margin of Vancouver Island, British Columbia. Submarine canyons can be formed via different pr ...
... The deep sea is home to a variety of geological features such as abyssal plains, mid-ocean ridges, trenches, and submarine canyons. Barkley Canyon is a submarine canyon located off of the west continental margin of Vancouver Island, British Columbia. Submarine canyons can be formed via different pr ...
Accumulation of Th, Pb, U, and Ra in marine phytoplankton and its
... nuclides out of the euphotic zone would be dominated by zooplanklon and larger phytoplankton and hence would not be representative of the preponderance of marine phytoplankton. However, collection of sufficient quantities of pure phytoplankton from natural waters for radiochemical analysis is diffic ...
... nuclides out of the euphotic zone would be dominated by zooplanklon and larger phytoplankton and hence would not be representative of the preponderance of marine phytoplankton. However, collection of sufficient quantities of pure phytoplankton from natural waters for radiochemical analysis is diffic ...
primary production methods - Center for Microbial Oceanography
... ed as CH2 O. Carbon dioxide in sea water is found in several chemical forms which exchange quickly enough to be considered in aggregate as total CO2 (TCO2 ). In principle, photosynthesis can be quantiRed by measuring any of three light-dependent processes: (1) the increase in organic carbon; (2) the ...
... ed as CH2 O. Carbon dioxide in sea water is found in several chemical forms which exchange quickly enough to be considered in aggregate as total CO2 (TCO2 ). In principle, photosynthesis can be quantiRed by measuring any of three light-dependent processes: (1) the increase in organic carbon; (2) the ...
Case Study 6 Monitoring Phytoplankton Productivity from
... downwelling irradiance. The objective of this exercise is to estimate the light flux received by a unit volume of water from all directions, the so-called scalar irradiance, which is the quantity useful for photosynthesis. ...
... downwelling irradiance. The objective of this exercise is to estimate the light flux received by a unit volume of water from all directions, the so-called scalar irradiance, which is the quantity useful for photosynthesis. ...
Conceptual models for the biogeochemical role of the photic zone
... (1997) to suggest that the difference between phytoplankton and bacterial affinity may not be as clear as hitherto assumed. We can estimate the specific affinity in natural populations from experimental data following the procedure suggested in Table 2. Using typical values from Villefranche Bay (no ...
... (1997) to suggest that the difference between phytoplankton and bacterial affinity may not be as clear as hitherto assumed. We can estimate the specific affinity in natural populations from experimental data following the procedure suggested in Table 2. Using typical values from Villefranche Bay (no ...
Summary and Conclusion
... zooplankton. Among the copepods, harpacticoid copepod Macrosetella gracilis forms the dominant one. Adults and larvae of this species were found attached to the Trichodesmium filaments. Among fish eggs and larvae in the zooplankton samples, eggs were more abundant than larvae. Presence of fish eggs ...
... zooplankton. Among the copepods, harpacticoid copepod Macrosetella gracilis forms the dominant one. Adults and larvae of this species were found attached to the Trichodesmium filaments. Among fish eggs and larvae in the zooplankton samples, eggs were more abundant than larvae. Presence of fish eggs ...
Canini N. D., Metillo E. B., 2017 Temporal changes in the
... study, net phytoplankton was recorded in decreasing order of abundance: diatoms > dinoflagellates > cyanobacteria. Diatom cells appeared as chain-forming, centric, zigzag colonies, elongated and solitary or united in a chain by spines. Some species were common in estuarine, marine, typical of tropic ...
... study, net phytoplankton was recorded in decreasing order of abundance: diatoms > dinoflagellates > cyanobacteria. Diatom cells appeared as chain-forming, centric, zigzag colonies, elongated and solitary or united in a chain by spines. Some species were common in estuarine, marine, typical of tropic ...
A quantitative analysis of the direct and indirect costs of nitrogen
... rate increased with oxygen concentration. The sensitivity to oxygen manifests largely as a 'maintenance' effect, increasing overall carbohydrate consumption (Figure 1a) because the cell must be equally clear of oxygen even at very low growth and nitrogen fixation rates. Azotobacter encodes and expre ...
... rate increased with oxygen concentration. The sensitivity to oxygen manifests largely as a 'maintenance' effect, increasing overall carbohydrate consumption (Figure 1a) because the cell must be equally clear of oxygen even at very low growth and nitrogen fixation rates. Azotobacter encodes and expre ...
University of Groningen von Liebig`s Law of the Minimum and
... misinterpreted by his successors. BRAt,rOT(1899) took this one law out of its context and proposed that limitation by nitrogen is a dominant factor in plankton ecology, far beyond its original application to agriculture. This was opposed by NAmANSOrn~(1908) who suggested instead a dynamic balance of ...
... misinterpreted by his successors. BRAt,rOT(1899) took this one law out of its context and proposed that limitation by nitrogen is a dominant factor in plankton ecology, far beyond its original application to agriculture. This was opposed by NAmANSOrn~(1908) who suggested instead a dynamic balance of ...
