Microalgal species in the modern times

8/20/2019 Microalgal species in the modern times

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Botryococcus brauniiIsochrysis sp.

Tetraselmis sp.


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Botryococcus braunii


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For this study, we used samples collectedfrom four sites- Nagbacalan (I), Suba (II),Nanguyudan (III) and Sungadan (IV) fromMay to September !!" (Fig# $)# %uring

sampling, rust-colored aggregates of thealgae was fre&uently obser'ed on thelae surface# Microscopic eamination'eri*ed that it was of the oil-rich colonial

green alga, Botryococcus braunii.


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Map of Paoay Lake, Ilocos Norte, Luzon

Is., Philippines, showing the samplingsites 1-4.+nalysis of the collected samples re'ealed that B.braunii colonies were present in all of samplescollected from the four sampling sites during study

time


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Botryococcus braunii is member of the

chlorophyceae (chlorophyta)#

B. braunii is regarded as a potential source of

renewable fuel because of its ability to producelarge amounts of hydrocarbons# %epending onthe strain and growth conditions, up to . ofalgal dry mass can be hydrocarbons#


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/hotosynthetic cultures of B. braunii require01# 0ultures aerated with !#2. 01-enriched

air ha'e a much shorter mass doubling time (3!h) compared with " days for cultures suppliedwith ambient air# 01 enrichment fa'ors theformation of lower botryococcenes (02!402),whereas cultures sparged with ambient air

accumulate higher botryococcenes (0224023)(5olf et al#, $67a)# +pparently, methylationsteps leading from 02! to 02$ and 02 are fasterin 01-enriched cultures than steps leading to

022, 023 and higher homologues# +lthoughautotrophic, B. braunii utilizes exogenous carbonsources for impro'ed growth and hydrocarbonproduction#


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+t present, the production ofphotosynthetic fuel oils is notcompetiti'e with petroleumderi'ed fuels# 1ne reason for this

is a relati'ely slow growth rate ofB. braunii.


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Isochrysis sp#

Isochrysis galbana is a free living marineunicellular phytoagellate of the orderChrysomonadales. i!e other members of thisorder it is rich in polyunsaturated fatty acids 8which are of nutritional 'alue for marine

*sh lar'ae#


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Sparging of cultures with01($.) enrichedair was e'en more

e9ecti'e in increasinggrowth rate and yield, aslong asthe culture medium was

supplemented with ecessFe 2: (Fig# 7), otherwise,Fe 2: star'ationde'eloped rapidly#+pparently ecess 01causesprecipitation of Fe 2: asinsoluble carbonates#+ddition of saturating

concentrations


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;etraselmis sp#


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Microalgal species in the modern times