Journal ArticleDOI
Physiology of phytoplankton in relation to metal concentration: effect of cadmium on Scenedesmus bijugatus and Nitzschia palea
K. S. Sathya,K. P. Balakrishnan +1 more
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The physiology of the species was significantly affected by Cd during the exponential growth phase and altered the ratio of carbohydrate, protein and lipid in the test species.Abstract:
The effect of Cd at sublethal concentrations on pure cultures of S. bijugatus and N. palea was studied with special reference to their physiology during exponential growth phase. Photosynthetic productivity, respiration, pH, biomass, pigments, carbohydrate, protein, lipid as well as nutrient uptake were selected to study the comprehensive effect of the metal. The physiology of the species was significantly affected by Cd during the exponential growth phase and altered the ratio of carbohydrate, protein and lipid in the test species.read more
Citations
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Variation in biochemical constituents and master elements in common seaweeds from Alexandria Coast, Egypt, with special reference to their antioxidant activity and potential food uses: prospective equations
TL;DR: The tested seaweeds can be recommended as a source of healthy food with suitable ion quotient and estimated daily intake values by applying stepwise multiple regression analysis, prospective equations have been set to describe the interactions between these parameters inside seaweeds.
Journal ArticleDOI
Short- and long-term changes in growth and biochemical composition of Selenastrum capricornutum populations exposed to cadmium
TL;DR: During the 8- to 80-h period, the carbon, protein and lipid cell quotas of the populations exposed to Cd were significantly higher than the control despite significant reductions in growth rate, however, further exposure resulted in a significant decrease in the carbon and macromolecule quotas.
Journal ArticleDOI
Preliminary investigation into the chemical composition of the invasive brown seaweed Sargassum along the West Coast of Ghana
TL;DR: Results of the study indicated that the Sargassum samples analyzed contained low concentrations of nitrogen, however, nitrogen utilized by plants, namely, nitrate and ammonia were very high, together with phosphates, which makes the Sargeassum a good source organic fertilizer, but the high concentrations of toxic heavy metals defeat this assertion.
Journal ArticleDOI
Growth, composition and metal removal potential of a Phormidium bigranulatum-dominated mat at elevated levels of cadmium.
TL;DR: Evaluating the response of a cyanobacterial mat, dominated by Phormidium bigranulatum, to elevated concentrations of Cd²⁺ in the medium found that older mats more strongly resisted to changes in its species composition than the younger ones upon exposure to high concentrations ofCd²¬⁺.
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Toxicity of cadmium to the green alga Parachlorella kessleri: Producing Cd-loaded algae for feeding experiments
TL;DR: Levels lower than 2 µg Cd/L should be employed to produce Cd-carrying algae for feeding experiments with organisms on the next trophic level, e.g. mussels, to avoid reduced food uptake.
References
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Standard methods for the examination of water and waste water.
TL;DR: Alkalinity measurements are used in the interpretation and control of water and wastewater treatment processes and can be interpreted in terms of specific substances only when the chemical composition of the sample is known.
Journal ArticleDOI
New spectrophotometric equations for determining chlorophylls a, b, c1 and c2 in higher plants, algae and natural phytoplankton
S.W. Jeffrey,G.F. Humphrey +1 more
TL;DR: New equations are presented for spectrophotometric determination of chlorophylls, based on revised extinction coefficients of chloropylls a, b, c1 and c2, which may be used for determining chlorophyLLs a and b in higher plants and green algae.
Journal ArticleDOI
Determination of chlorophyll and pheo‐pigments: spectrophotometric equations1
Journal ArticleDOI
Hormesis--the stimulation of growth by low levels of inhibitors.
TL;DR: Evidence from the literature shows that not only has growth hormesis been observed in a range of taxa after exposure to a variety of agents, but also that the dose-response data have a consistent form.
Journal ArticleDOI
A pH-DEPENDENT MODEL FOR THE CHEMICAL SPECIATION OF COPPER, ZINC, CADMIUM, AND LEAD IN SEAWATER
Alberta Zirino,Sachio Yamamoto +1 more
TL;DR: A pH-dependent model for the speciation of divalent Cu, Zn, Cd, and Pb ions in seawater was constructed with available and estimated thermodynamic stability constants and individual ion activity coefficients as mentioned in this paper.
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