Cellular Photosynthetic Rate of Fully and Partially Pigmented Chlamydomonas reinhardtii as a Function of Irradiance

2011 ◽  
Author(s):  
Thomas E. Murphy ◽  
Halil Berberog˘lu
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Green Algae ◽  
Photosynthetic Rate ◽  
Wild Strain ◽  
Experimental Setup ◽  
Light Penetration ◽  
Photosynthetic Rates ◽  
Planktonic Algae ◽  
Mass Cultures ◽  
Increase Productivity

This paper reports the cellular photosynthetic rates of the green algae Chlamydomonas reinhardtii wild strain and its truncated chlorophyll antenna transformant, tla1, as a function of local irradiance. It is hypothesized that reduction in the pigmentation of algae cells can enhance light peneration in mass cultures and increase productivity. Thus, an experimental setup was designed to expose each cell within planktonic algae cultures to a nearly uniform irradiance. An oxygen microsensor was used to monitor the photosynthetic rate as the irradiance onto the sample was varied. The results showed that the cellular photosynthetic rate of the wild strain, CC125, was greater than that of tla1 at all irradiances, by a factor that ranged from 1.7 to 4. Photoinhibition was observed in both strains, although the effect was more pronounced in CC125. Although less pigmented cells enable deeper light penetration in photobioreactors, their reduced phosotynthetic rate can negate this benefit.

Effects of Clone and Irrigation on the Stomatal Conductance and Photosynthetic Rate of Tea (Camellia sinensis)

1994 ◽  
Vol 30 (1) ◽  
pp. 1-16 ◽  
Author(s):  
B. Gail Smith ◽  
Paul J. Burgess ◽  
M. K. V. Carr
Keyword(s):  
Stomatal Conductance ◽  
Camellia Sinensis ◽  
Photosynthetic Rate ◽  
Leaf Temperature ◽  
Temperature Optimum ◽  
Photosynthetic Rates ◽  
Clone Selection ◽  
Treatment Interaction ◽  
Dry Seasons ◽  
The Relationship

SummaryStomatal conductances (g) and photosynthetic rates (A) were monitored in six tea clones planted in a clone X irrigation experiment in the Southern Highlands of Tanzania. Measurements were made during the warm dry seasons of 1989 and 1990. There was no genotype X treatment interaction in the response in A or g of the various clones to irrigation. Irrigation increased A more than it increased g. Irrigation also increased the temperature optimum for photosynthesis and decreased photo-inhibition at high illuminance. Clones differed in g and A, and in the relationship between leaf temperature and A. The implications of these findings for clone selection are discussed.

Inactivation and Reactivation of the Hydrogenases of the Green Algae Scenedesmus obliquus and Chlamydomonas reinhardtii

1993 ◽  
Vol 48 (1-2) ◽  
pp. 41-45 ◽  
Author(s):  
Thomas Urbig ◽  
Rüdiger Schulz ◽  
Horst Senger
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Green Algae ◽  
Scenedesmus Obliquus ◽  
Sodium Dithionite ◽  
Anaerobic Conditions ◽  
Whole Cells ◽  
Complete Inactivation

The hydrogenases of the green algae Scenedesmus obliquus and Chlamydomonas reinhardtii were activated under anaerobic conditions. Exposure of whole cells and cell-free homogenates to air lead to a complete inactivation of the hydrogenases. The inactivation in whole cells of Scenedesmus is faster than the inactivation of the cell-free homogenate. Inactivation of the hydrogenases could be reversed by anaerobic readaptation in whole cells. The inactivation of the hydrogenase in homogenates seems to be irreversible. Neither the removal of oxygen nor the addition of ATP, NAD(P)H, sodium dithionite, dithiothreitol, ferredoxin and thioredoxin to homogenates facilitated the reactivation of the hydrogenase. The occurrence of a hydrogenase regulating factor is discussed.

ENHANCEMENT OF GREEN ALGAE HYDROGEN PRODUCTION BY LASER IRRADIATION

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Mohamad Aizat Abu Bakar ◽  
Noriah Bidin
Keyword(s):  
Diode Laser ◽  
Green Algae ◽  
Capillary Tube ◽  
Red Light ◽  
Wild Strain ◽  
Gas Production ◽  
Hydrogen Gas ◽  
Measuring System ◽  
Red Light Laser ◽  
Set Up

Biohydrogen is an alternative to support the increasing hydrogen demand in the future. Biohydrogen is hydrogen gas produced by green algae and bacteria in certain quantity. The aim of this research is to enhance hydrogen gas production by green algae (Closterium sp.) using laser light. The laser used in this experiment was a diode laser operating in continuous mode with wavelength of 655 nm. Green algae are placed in a sulphur deprived medium so it will produce hydrogen gas. This algae is irradiated with diode laser for 30 minutes then stop before continue for the next 30 minutes. This process is repeated until the total irradiation is 120 minutes. Both strains of green algae are set up into measuring system under exposure of sunlight in a constant room temperature. The volume and rate of hydrogen gas produced is examined by measuring the dye position in capillary tube of 0.5 mm radius. The results showed that there is a 9.0% increase of hydrogen gas production in radiated strain of green algae compared to the wild strain. The rate of hydrogen gas production of radiated algae is faster than the wild strain. This showed that, red light laser has absorbed cell green algae and mutated its behaviour for producing more hydrogen gas. This result is in good agreement with other researcher.  

scholarly journals Toxicity of Alkylphenols to Unicellular Green Algae Chlamydomonas reinhardtii.

2002 ◽  
Vol 25 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Hitoshi TANAKA ◽  
Ju-Hyun KIM ◽  
Shogo NAKAMURA ◽  
Ryuichi SUDO
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Green Algae

PHOTOSYNTHESIS IN ALGAE: II. GREEN ALGAE WITH SPECIAL REFERENCE TO DUNALIELLA SPP. AND TETRASELMIS SPP.

1966 ◽  
Vol 44 (10) ◽  
pp. 1247-1254 ◽  
Author(s):  
J. S. Craigie ◽  
J. McLachlan ◽  
W. Majak ◽  
R. G. Ackman ◽  
C. S. Tocher
Keyword(s):  
Hydrogen Sulfide ◽  
Special Reference ◽  
Green Algae ◽  
Photosynthetic Rates ◽  
High Level

The photosynthetic fixation of14CO2was studied in 10 species of chlorophycean algae and in 9 isolates of prasinophycean algae of the genus Tetraselmis.Green seaweeds had photosynthetic rates of 2.2 to 4.4 mg CO2 × h−1 × g−1, accumulated starch, glucose, fructose, and sucrose, and excreted very little recent photosynthate.Dunaliella spp. were distinguished by a high level of organic excretion (to 29.2% of the14C fixed in 2 hours), the production of glycerol and hydrogen sulfide, and the absence of dimethyl-β-propiothetin.Tetraselmis spp. excreted relatively small amounts of photosynthate in 2 hours, and produced mannitol and dimethyl-β-propiothetin but not hydrogen sulfide.

LC Determination of 4-Bromoaniline in Green Algae Chlamydomonas reinhardtii After Continuous-Flow Microextraction

2007 ◽  
Vol 65 (7-8) ◽  
pp. 447-451 ◽  
Author(s):  
Xiujuan Liu ◽  
Xuedong Wang ◽  
Xiaowen Chen ◽  
Shao Yang
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Green Algae ◽  
Continuous Flow

Refactoring the Six-Gene Photosystem II Core in the Chloroplast of the Green Algae Chlamydomonas reinhardtii

2015 ◽  
Vol 5 (7) ◽  
pp. 589-596 ◽  
Author(s):  
Javier A. Gimpel ◽  
Hussam H. Nour-Eldin ◽  
Melissa A. Scranton ◽  
Daphne Li ◽  
Stephen P. Mayfield
Keyword(s):  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
Green Algae

Photosynthetic rates in relation to nitrogen recycling as an adaptation to nutrient deficiency in peat bog plants

1972 ◽  
Vol 50 (11) ◽  
pp. 2227-2233 ◽  
Author(s):  
Ernest Small
Keyword(s):  
Net Photosynthetic Rate ◽  
Leaf Litter ◽  
Photosynthetic Rate ◽  
Nutrient Deficiency ◽  
Peat Bog ◽  
Nitrogen Recycling ◽  
Leaf Fall ◽  
Deciduous Species ◽  
Photosynthetic Rates ◽  
Sphagnum Peat

Fifteen species growing in a raised sphagnum peat bog were compared with 13 non-bog species with respect to their light-saturated net photosynthetic rate, and the content of N, P, and K within their foliage and leaf litter. Bog species were found to reabsorb significantly more nitrogen from their foliage preceding leaf fall than non-bog species. An estimate of the potential photosynthate which the species could manufacture during the time a given unit of nitrogen remained in the plant, before being lost through leaf fall, was calculated for the 28 species. The values found averaged 235% higher for the bog evergreens than for the bog deciduous species, and about 60% higher in the bog deciduous species than in the non-bog deciduous species. The hypothesis is advanced that the increased time available to use nitrogen photosynthetically before it is recycled is adaptive in bog plants, especially in evergreens, because of the difficulty in acquiring nitrogen from the extremely nutrient-deficient bog substrate.

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