scholarly journals Inhibition of Algal Growth in Water Purification Process by UV Irradiation and Observation of Damage Level on Algal Cell

2016 ◽  
Vol 39 (4) ◽  
pp. 91-96
Author(s):  
Yoshimi MORIYA ◽  
Masahiro OTAKI
Keyword(s):  
Uv Irradiation ◽  
Water Purification ◽  
Algal Cell ◽  
Algal Growth ◽  
Purification Process ◽  
Damage Level

On-line indirect measures estimation for the performance of an absorption heat transformer integrated to a water purification process

Measurement ◽  
2009 ◽  
Vol 42 (3) ◽  
pp. 464-473 ◽  
Author(s):  
R.F. Escobar ◽  
J. Uruchurtu ◽  
D. Juárez ◽  
J. Siqueiros ◽  
J.A. Hernández
Keyword(s):  
Water Purification ◽  
Purification Process ◽  
Indirect Measures ◽  
On Line ◽  
Heat Transformer

scholarly journals Chemical Profiling of Volatile Organic Compounds in the Headspace of Algal Cultures as Early Biomarkers of Algal Pond Crashes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kristen L. Reese ◽  
Carolyn L. Fisher ◽  
Pamela D. Lane ◽  
James D. Jaryenneh ◽  
Matthew W. Moorman ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Biomass Production ◽  
Brachionus Plicatilis ◽  
Solid Phase ◽  
Algal Cell ◽  
Algal Growth ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Organic ◽  
Early Indicators

Abstract Algae ponds used in industrial biomass production are susceptible to pathogen or grazer infestation, resulting in pond crashes with high economic costs. Current methods to monitor and mitigate unhealthy ponds are hindered by a lack of early indicators that precede culture crash. We used solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry (GC-MS) to identify volatiles emitted from healthy and rotifer infested cultures of Microchloropsis salina. After 48 hours of algal growth, marine rotifers, Brachionus plicatilis, were added to the algae cultures and volatile organic compounds (VOC) were sampled from the headspace using SPME fibers. A GC-MS approach was used in an untargeted analysis of VOCs, followed by preliminary identification. The addition of B. plicatilis to healthy cultures of M. salina resulted in decreased algal cell numbers, relative to uninfected controls, and generated trans-β-ionone and β-cyclocitral, which were attributed to carotenoid degradation. The abundances of the carotenoid-derived VOCs increased with rotifer consumption of algae. Our results indicate that specific VOCs released by infected algae cultures may be early indicators for impending pond crashes, providing a useful tool to monitor algal biomass production and pond crash prevention.

On-line LiBr+H2O estimation for the performance of a water purification process integrated to an absorption heat transformer

2009 ◽  
Vol 5 (1-3) ◽  
pp. 12-18 ◽  
Author(s):  
V.M. Velazquez ◽  
J.A. Hernández ◽  
D. Juárez ◽  
J. Siqueirosa ◽  
S.F. Mussati
Keyword(s):  
Water Purification ◽  
Purification Process ◽  
On Line ◽  
Heat Transformer

The green hydra symbiosis. VIII. Mechanisms in symbiont regulation

1984 ◽  
Vol 221 (1224) ◽  
pp. 291-319 ◽  
Keyword(s):  
Cell Division ◽  
Algal Cell ◽  
Algal Growth ◽  
Culture Conditions ◽  
Continuous Illumination ◽  
Digestive Cell ◽  
Green Hydra ◽  
European Strain ◽  
Standard Culture ◽  
Feeding Regimes

The relative amount of symbiotic algae and animal tissue in the European strain of green hydra was altered by changes in illumination and feeding regimes. This indicates that the host can regulate the algal population to different sizes depending on external conditions. For animals maintained in continuous illumination, 12 h light: 12 h dark, and continous darkness, each with thrice-weekly feeding, a highly significant regression of algal volume per digestive cell on digestive cell volume was demonstrated, suggesting that the space available for the algae may be one factor that determines the population size of the algal symbionts. Seven strains of Chlorella originally symbiotic with other invertebrates formed stable associations with the European strain of green hydra; this included one strain (NC64A) which released very little maltose at pH 4-5. Althought the relative amounts of algal and host biomass of these experimental associations were very similar under standard culture conditions, large numbers of cells of strain NC64A were regularly expelled from the host. This suggests that the ability of the host to control the growth rate of its symbionts is related to the alga’s capacity for maltose release. The latter characteristic is also correlated with a sensitivity of growth to acid conditions. Of the five cultured strains of symbiotic Chlorella examined, only the two strains that released substantial amounts of maltose at pH 4-5 failed to grow at pH 4.0 and pH 4.5. It is proposed that the regulation of algal cell division in the natural symbiosis is principally mediated through relatively small and temporary changes in the pH of the perialgal vacuole. At more acid values, photosynthetically fixed carbon is primarily directed towards maltose release and little or no algal growth occurs. At higher pH values, maltose release declines sharply and the carbon becomes primarily directed towards symbiont growth. Such a relatively simple hypothetical model, involving stimulation of symbiont growth by temporary alkalinization of the perialgal vacuole, can explain the observed responses to change in environmental conditions, as well as the relation between the timing of symbiont and host cell division.

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