Optimization of the algal species Chlorella miniata growth: Mathematical modelling and evaluation of temperature and light intensity effects

2021 ◽  
pp. 102239
Author(s):  
A. Baran Sozmen ◽  
Ayca Ata ◽  
Bikem Ovez
Keyword(s):  
Light Intensity ◽  
Mathematical Modelling ◽  
Algal Species

Effect of algal species and light intensity on the performance of an air-lift-type microbial carbon capture cell with an algae-assisted cathode

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25094-25100 ◽  
Author(s):  
Xia Hu ◽  
Jiti Zhou ◽  
Baojun Liu
Keyword(s):  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Carbon Capture ◽  
Algal Species ◽  
Microbial Carbon ◽  
Air Lift

The effect of algal species (Chlorella vulgarisandChlorellasp.) and light intensity on the performance of air-lift-type microbial carbon capture cells (ALMCCs) was investigated.

scholarly journals Photosystem II Photochemistry and Phycobiliprotein of the Red AlgaeKappaphycus alvareziiand Their Implications for Light Adaptation

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Xiangyu Guan ◽  
Jinfeng Wang ◽  
Jianyi Zhu ◽  
Chunyan Yao ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Light Intensity ◽  
Red Algae ◽  
Light Adaptation ◽  
Kappaphycus Alvarezii ◽  
Algal Species ◽  
Light Yield ◽  
Raw Material ◽  
Photosystem Ii Photochemistry ◽  
Pharmaceutical Industries

Photosystem II photochemistry and phycobiliprotein (PBP) genes of red algaeKappaphycus alvarezii, raw material ofκ-carrageenan used in food and pharmaceutical industries, were analyzed in this study. Minimum saturating irradiance (Ik) of this algal species was less than 115 μmol m−2 s−1. Its actual PSII efficiency (yield II) increased when light intensity enhanced and decreased when light intensity reached 200 μmol m−2 s−1. Under dim light, yield II declined at first and then increased on the fourth day. Under high light, yield II retained a stable value. These results indicate thatK. alvareziiis a low-light-adapted species but possesses regulative mechanisms in response to both excessive and deficient light. Based on the PBP gene sequences,K. alvarezii, together with other red algae, assembled faster and showed a closer relationship with LL-Prochlorococcuscompared to HL-Prochlorococcus. Many amino acid loci in PBP sequences ofK. alvareziiwere conserved with those of LL-Prochlorococcus. However, loci conserved with HL-Prochlorococcusbut divergent with LL-Prochlorococcuswere also found. The diversities of PE and PC are proposed to have played some roles during the algal evolution and divergence of light adaption.

scholarly journals Influence of Light on Prymnesium Parvum Growth, Toxicity and Mixotrophy

2017 ◽  
Author(s):  
Emanuela Fiori ◽  
Nayani K. Vidyarathna ◽  
Johannes A. Hagström ◽  
Rossella Pistocchi ◽  
Edna Granéli
Keyword(s):  
Light Intensity ◽  
Algal Species ◽  
Ecological Impacts ◽  
Economic Losses ◽  
Prymnesium Parvum ◽  
Cellular Toxicity ◽  
Worldwide Distribution ◽  
Negative Effect ◽  
Lower Light ◽  
Cell Densities

The haptophyte Prymnesium parvum has a worldwide distribution, with dramatic increase in blooms in the last years. P. parvum blooms are often associated with massive fish kills and great ecological impacts and economic losses as a consequence. P. parvum is a mixotrophic organism, utilizing organic dissolved substances and particles to support its photosynthetic growth. The ability of P. parvum to produce toxic compounds, and being a mixotroph, makes it capable to outcompete other algal species for essential substances. These mechanisms are mostly enhanced when environmental conditions are not optimal for P. parvum growth. Here we report results on the growth, toxicity and mixotrophy, from experiments where P. parvum cells were grown as monocultures or together with Rhodomonas salina and exposed to different light conditions (dark, 100, 700, 2000 μmol photons m-2 s-1). The results showed that P. parvum growth is affected at light intensity of 700 μmol photons m-2 s-1 and the cells were photo-lysed when exposed to irradiances above this value. An inverse relationship between cellular toxicity and light intensity was observed, i.e. lower light irradiation induced higher cell toxicity. Phagotrophy was observed in all the conditions. P. parvum reached significantly higher cell densities when growing together with R. salina than in monocultures, while cellular toxicity was significantly reduced in the mixed cultures. Furthermore the presence of prey attenuated the negative effect of the higher irradiations on P. parvum growth.

Effect of Simazine on Photosynthesis and Growth of Filamentous Algae

Weed Science ◽  
1983 ◽  
Vol 31 (6) ◽  
pp. 899-903 ◽  
Author(s):  
Steven W. O'Neal ◽  
Carole A. Lembi
Keyword(s):  
Light Intensity ◽  
Algal Species ◽  
Filamentous Algae ◽  
Cladophora Glomerata ◽  
Light Intensities ◽  
The Relationship ◽  
Algicidal Effects

Simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] inhibited photosynthesis 50% at concentrations of 1.1 μM forSpirogyra jurgensii(Kutz), 3.0 μM forPithophora oedogonia(Mont.) Wittr., and 3.8 μM forCladophora glomerata(L.) Kutz. Photosynthesis ofAnkistrodesmus braunii(Brun.), a nonfilamentous species, was inhibited the same amount by 4.7 μM simazine. The filamentous algal species had significant reductions in growth but no other phytotoxic symptoms when exposed to 5 μM simazine at light intensities of 100 μE·m–2·s–1and below. Algicidal effects did occur at a light intensity of 400 μE·m–2·s–1and were most severe inSpirogyra.The relationship between light intensity and simazine toxicity indicates algicidal effectiveness on these filamentous algae will be limited in habitats where light is reduced by turbidity, depth, or self-shading.

Fine structure of the retina of the giant scallop, Placopecten magellanicus

1984 ◽  
Vol 42 ◽  
pp. 312-313
Author(s):  
C.V.L. Powell
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Light Intensity ◽  
Scanning Electron Microscope ◽  
Eye Development ◽  
Preliminary Observation ◽  
Columnar Epithelium ◽  
Placopecten Magellanicus ◽  
Environmental Light ◽  
Scanning Electron

The overall fine structure of the eye in Placopecten is similar to that of other scallops. The optic tentacle consists of an outer columnar epithelium which is modified into a pigmented iris and a cornea (Fig. 1). This capsule encloses the cellular lens, retina, reflecting argentea and the pigmented tapetum. The retina is divided into two parts (Fig. 2). The distal retina functions in the detection of movement and the proximal retina monitors environmental light intensity. The purpose of the present study is to describe the ultrastructure of the retina as a preliminary observation on eye development. This is also the first known presentation of scanning electron microscope studies of the eye of the scallop.

Effect of light intensity on the ultrastructure of the filamentous cyanobacterium, Anabaena variabilis

1988 ◽  
Vol 46 ◽  
pp. 300-301
Author(s):  
C. S. Bricker ◽  
S. R. Barnum ◽  
B. Huang ◽  
J. G. Jaworskl
Keyword(s):  
Fatty Acid ◽  
Light Intensity ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Anabaena Variabilis ◽  
Chloroplast Envelope ◽  
Major Constituent ◽  
Filamentous Cyanobacterium ◽  
Photosynthetic Membrane ◽  
Effect Of Light

Cyanobacteria are Gram negative prokaryotes that are capable of oxygenic photosynthesis. Although there are many similarities between eukaryotes and cyanobacteria in electron transfer and phosphorylation during photosynthesis, there are two features of the photosynthetic apparatus in cyanobacteria which distinguishes them from plants. Cyanobacteria contain phycobiliproteins organized in phycobilisomes on the surface of photosynthetic membrane. Another difference is in the organization of the photosynthetic membranes. Instead of stacked thylakolds within a chloroplast envelope membrane, as seen In eukaryotes, IntracytopIasmlc membranes generally are arranged in three to six concentric layers. Environmental factors such as temperature, nutrition and light fluency can significantly affect the physiology and morphology of cells. The effect of light Intensity shifts on the ultrastructure of Internal membrane in Anabaena variabilis grown under controlled environmental conditions was examined. Since a major constituent of cyanobacterial thylakolds are lipids, the fatty acid content also was measured and correlated with uItrastructural changes. The regulation of fatty acid synthesis in cyanobacteria ultimately can be studied if the fatty acid content can be manipulated.

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

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