scholarly journals Note on the effect of high nitrate concentration and light intensity on the growth and uptake rates of Phaeodactylum tricornutum (Bohlin) culture

1983 ◽  
Vol 32 (1) ◽  
pp. 91-98
Author(s):  
Gilda Schmidt
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Phaeodactylum Tricornutum ◽  
Nitrate Concentration ◽  
Nitrate Assimilation ◽  
Cell Number ◽  
Uptake Rates ◽  
High Nitrate Concentration

The effect of high nitrate concentration and light intensity on chlorophyll-a synthesis, cell number and nitrate assimilation on P. tJt¿coh,nuutum culture, was determined. Growth and uptake rates were determined as a function of nitrate concentration ranging from 0.40 to 35.40 µg/l. The Ks showed high values, when compared with those obtained with lower nitrate concentration. The percentual variation of Ks was greater than that of Vmax.

scholarly journals Phaeodactylum Trıcornutum Kültürlerinde Biyomas Tahmini

2017 ◽  
Vol 5 (2) ◽  
pp. 182
Author(s):  
Burcu Ak ◽  
Gökhan Tamer Kayaalp ◽  
Oya Işık ◽  
Melis Çelik Güney
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Optical Density ◽  
Phaeodactylum Tricornutum ◽  
Dry Matter ◽  
Nitrogen Deficiency ◽  
Regression Equation ◽  
Control Group ◽  
Analysis Method ◽  
The Mathematical Model

Phaeodactylum tricornutum is the microalgae that is known to produce lipid. In this study, it was aimed to estimate the microalgae Phaeodactylum tricornutum dry matter cultured in the conditions of nitrogen deficiency as a stress factor, in outdoor, in photo bioreactors, by using multiple regression analysis method. In this study, diatom Phaeodactylum tricornutum (Bohlin) was cultured medium of which N was reduced by 50% and with 20% inoculation ratio. The light intensity, temperature, optical density and chlorophyll a, were measured daily. The mathematical model was formed for control group and 50 % of the N applied to the group using optical density, temperature, light intensity, chlorophyll a and without chlorophyll a. The regression equation of control group was estimated. The R2 value of control group was found 95.1% and statistically significant. Then, the regression equation was estimated for control group without chlorophyll a. The R2 value of this equation was found 94.0% and statistically significant. And then, the regression equation was estimated in 50% nitrogen. The R2 value of control group was found 92.4% and statistically significant. Finally, the regression equation was estimated in 50% nitrogen deficiency without chlorophyll a. The R2 value of this equation was found 91.7% and statistically significant.

Denitrification under high nitrate concentration and alternating anoxic conditions

1999 ◽  
Vol 33 (15) ◽  
pp. 3311-3320 ◽  
Author(s):  
D Bilanovic ◽  
P Battistoni ◽  
F Cecchi ◽  
P Pavan ◽  
J Mata-Alvarez
Keyword(s):  
Nitrate Concentration ◽  
Anoxic Conditions ◽  
High Nitrate Concentration

Growth Performance and Nutritional Value of Chlorella ellipsoidea in Fertilizer Factory Effluent Media

2007 ◽  
Vol 20 (1) ◽  
Author(s):  
M. A. TOYUB ◽  
S.R. AHMED ◽  
M. I. MIAH ◽  
M. A. B. HABIB
Keyword(s):  
Growth Performance ◽  
Chlorophyll A ◽  
Nutritional Value ◽  
Specific Growth ◽  
Basal Medium ◽  
Cell Number ◽  
Total Biomass ◽  
Chlorella Ellipsoidea ◽  
Green Alga Chlorella ◽  
Chlorophyll A Content

The growth performance of green alga, Chlorella ellipsoidea was studied in a laboratory in different concentrations of fertilizer factory effluent media (FFEM). Five different concentrations viz. 40, 45, 50, 55 and 60% of FFEM and bold basal medium (BBM) (control) were used with three replications for a period of three months. Each trial was done for a period of 16 days. The initial cell density of C. ellipsoidea was 2.5×105 cells.ml-1 which attained a maximum density of 198.49x105 cells.ml-1 in BBM followed by 182.07, 157.41, 142.34, 137.57 and 121.35 (x105 cells. ml-1) in 50, 55, 45, 60 and 40 % FFEM, respectively on the 10th day of culture. A similar trend was observed in the case of chlorophyll a content and the range was 5.85 to 9.39 mg.l-1. The specific growth rate (SGR, μ.day-1) on the basis of cell number and chlorophyll a were found at 0.40 to 0.44 and 0.41 to 0.45, respectively and was significantly (p<0.05) higher in BBM. The total biomass was found at 629.13 and 541.36 mg.l-1 in BBM and 50% FFEM, respectively. The overall growth performance of C. ellipsoidea was significantly (p<0.05) higher in 50% FFEM than in other concentrations of FFEM. The cultured microalga was found nutritionally rich.

EFFECT OF DIFFERENT SALINITY AND LIGHT INTENSITY ON THE GROWTH OF PORPHYRIDIUM CRUENTUM

2021 ◽  
Vol 8 (18) ◽  
pp. 71-77
Author(s):  
Leyla USLU
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Optical Density ◽  
Dry Matter ◽  
Porphyridium Cruentum ◽  
Laboratory Conditions ◽  
Light Intensities ◽  
Density Values

In the study, Porphyridium cruentum was cultured under laboratory conditions at 20±2°C, 16:8 (light:dark) photoperiod and continuous aeration to different salinity (20‰, 30‰, 40‰) and two different light intensities (37 µmol m-2s-1 photon and 110 µmol m-2s-1 photon) and growth was determined. Dry matter, optical density and chlorophyll a parameter were used to determine growth. The best growth was determined in culture with a salinity of 30‰ at 110 µmol m-2s-1 photon light intensity. In this group, the optical density (OD) was 1.504±0.003 and the dry matter amount was 1.327gl-1. In the case of 37µmol µmol m-2s-1 photon light intensity, the optical density values were found to be similar in groups with 30‰ and 50‰ salinity and were found to be 1.234±0.004 and 1.215±0.002, respectively. The amounts of dry matter were also similar; 1.168gl-1 and 1.159gl-1, respectively. While the lowest growth was in the culture at 37 µmol m-2s-1 photon light intensity and 20‰ salinity. The optical density obtained on the last day of this group was 1.165±0.004 and the dry matter amount was determined as 0.986gl-1. The amount of chlorophyll a was determined in the cultured groups at the best 37 µmol m-2s-1 photon light intensity.

Changes in Levels of a-Tocopherol and Ascorbate in Spruce Needles at Three Low Mountain Sites Exposed to Mg2+-Deficiency and Ozone

1994 ◽  
Vol 49 (3-4) ◽  
pp. 171-180 ◽  
Author(s):  
U. Schmieden ◽  
A. Wild
Keyword(s):  
Oxidative Stress ◽  
Light Intensity ◽  
Chlorophyll A ◽  
Antioxidant Status ◽  
Photosynthetic Capacity ◽  
High Light Intensity ◽  
High Light ◽  
Absolute Level ◽  
Ozone Concentrations ◽  
Spruce Needles

The main objective of this study was the com parison of changes in levels of α-tocopherol and ascorbate in needles of spruce trees with various degrees of damage at three low mountain sites. The ascorbate content in needles of spruce trees with various degrees of dam age differs in the course of seasons as well as in the absolute level. The antioxidant status was affected mainly during summer. The content of ascorbate in needles of dam aged trees was significantly increased compared to that of undamaged trees. Despite seasonal and daily fluctuations, the level of ascorbate seems to be a good indicator for the degree of dam age in the case of symptoms described as montane yellowing. Together with an increasing content of α-tocopherol per chlorophyll, a rise of ascorbate content indicates enhanced oxidative stress in the needles of damaged trees, particularly in summer. Asc/αToc ratios were increased in needles of damaged trees. At the studied sites enhanced oxidative stress could be caused by the com bined action of Mg2+-deficiency, high ozone concentrations and high-light intensity, all inducing an increased production of radicals in combination with a reduced photosynthetic capacity

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