{"id":167,"date":"2006-09-13T05:05:00","date_gmt":"2006-09-13T05:05:00","guid":{"rendered":"http:\/\/oilgae.com\/blog\/?p=167"},"modified":"2010-05-11T09:25:44","modified_gmt":"2010-05-11T09:25:44","slug":"effects-of-light-intensity-on-growth","status":"publish","type":"post","link":"http:\/\/www.oilgae.com\/blog\/2006\/09\/effects-of-light-intensity-on-growth.html","title":{"rendered":"Effects of Light Intensity on Growth Rates of Green Algae"},"content":{"rendered":"

You are at the blog of Oilgae – Oil & Biodiesel from Algae<\/a><\/strong>; Oilgae Blog Home Page<\/a><\/strong><\/p>\n

Found this link from a suggestion at the popular Oil from Algae Yahoo group. This was suggested by a group member David Miller, thanks David!<\/p>\n

”
\nThe Effects of Light Intensity on the Growth Rates of Green Algae.
\n1,2,3, Constantine Sorokin4 and Robert W. Krauss<\/p>\n

DEPARTMENT OF BOTANY, UNIVERSITY OF MARYLAND, COLLEGE PARK, MARYLAND<\/p>\n

see the full paper<\/a>, PDF version <\/a><\/p>\n

David’s comments:<\/p>\n

“It graphs out the relationship between growth rate of various species with light intensity. One species in particular was very dependent on temperature, and could tolerate and use much more light at 39 degrees C vs 25…<\/p>\n

In a nutshell then, each species had some minimum light level required
\nto keep them alive but not growing at all, and growth seemed
\nproportional to light intensity from there for “a ways’ before it
\nleveled off and began to decline. They found species with optimal
\nlight intensities ranging from 2.5% (chlorella vulgaris) to 14% of
\nfull sunlight. They expressed it as 250 to 1400 ftcandles and
\nwikipedia lists full sun as 10000 fc.”<\/p>\n

This is quite a useful paper, folks<\/p>\n

See also in the same forum, a related comment by Abhishek Narain (thanks Narain), to a different question though:<\/p>\n

”
\nThe growth profile of algae shows a proportional increase with increase in light intensity. However after a certain light intensity, the growth profile shows declination with further increase in light intensity. This value of light intensity from where the declination starts is termed to cause the phenomena of LIGHT INHIBITION, such that the growth of algae decreases due to damage in light pigments at high intensity.<\/p>\n

What this value of light intensity shoul be, is a function of the photobioreactor design, and in particular the arrangement and kind of light source. Ideally, one should aim to avoid a light source which has large amount of that wavelength of light spectra, which are not unsed in photosynthesis, typically the Violet region and the Red region. These wavelength merely are a waste of energy. However, if source of light is the light from sun, then you save money by not wasting aftificial sources of energy.<\/p>\n

There are a lot of photobioreactor design available in literature, but none that is good for large scale production with efficient distribution of light and carbon-dioxide and with a compact geometry.<\/p>\n

Hope that helps.<\/p>\n

Regards
\nNarain
\n”<\/p>\n

Another research paper citation on “Effects of Light Intensity”, this time posted by Tom Catino, thanks Tom!<\/p>\n

“Effects of light intensity, CO2 and nitrogen supply on lipid class
\ncomposition of Dunaliella viridis
\nJournal Journal of Applied Phycology
\nPublisher Springer Netherlands
\nISSN 0921-8971 (Print) 1573-5176 (Online)
\nSubject Biomedical and Life Sciences
\nIssue Volume 10, Number 2 \/ April, 1998
\nDOI 10.1023\/A:100806702 2973
\nPages 135-144
\nOnline Date Monday, November 29, 2004
\nAdd to marked items
\nAdd to saved items
\nRecommend this article<\/p>\n

Effects of light intensity, CO2 and nitrogen supply on lipid class
\ncomposition of Dunaliella viridis
\nFrancisco J. L. Gordillo1, Madeleine Goutx2, Felix L. Figueroa1 and
\nF. Xavier Niell1<\/p>\n

(1) Departamento de Ecologia. Facultad de Ciencias, Universidad de
\nM\u00e1laga, Campus de Teatinos s\/n, 29071 M\u00e1laga, Spain
\n(2) Microbiologie Marine (CNRS, U.P.R. 223), Campus de Luminy, CASE
\n907, 13288 Marseille cedex 9, France<\/p>\n

Abstract<\/strong>: Lipid class composition of Dunaliella viridis Teodoresco
\nwas analysed using thin layer chromatography coupled with flame
\nionisation detection (TLC\/FID technique). D. viridis was cultured
\nunder four different photon fluence rates and in darkness, and under
\ntwo different conditions of CO2 supply (atmospheric and 1%) with and
\nwithout nitrogen sufficiency. Nine lipid classes were identified and
\nquantified. Total lipids per cell and acetone-mobile polar lipids
\ndecreased with light, while the percentage of sterols and
\ntriglycerides increased with increasing irradiance. Total
\nphospholipids increase was related with growth rate while
\nhydrocarbons, wax esters and sterol esters accumulated in darkness.
\nThere were almost no changes in total lipids per cell because of
\nnitrogen limitation; however, nitrogen limitation led to higher
\nchanges in lipid class composition under 1% CO2 than under
\natmospheric CO2 levels. The main reserve lipid, triglycerides,
\naccumulated in high amounts under 1% CO2 and nitrogen limitation,
\nincreasing from 1% to 22% of total lipids. The ratio sterols\/acetone-
\nmobile polar lipids could be an index of the ‘light status’
\nindependently of nitrogen limitation, while the ratio
\ntriglycerides\/ total phospholipids could indicate any physiological
\nstress uncoupling C and N metabolism and affecting the growth rate.
\nLight – CO2 – nitrogen – lipids – thin layer chromatography – flame
\nionisation – microalga – batch culture – Dunaliella viridis<\/p>\n

This revised version was published online in June 2006 with
\ncorrections to the Cover Date.<\/p>\n

http:\/\/www.springerlink.com\/content\/t271hk066q243u54\/<\/a><\/p>\n

Cheers
\nEc<\/p>\n

Oilgae – Oil & Biodiesel from Algae<\/a><\/strong>
\nOilgae Blog<\/a><\/strong>
\nalgOS – Biodiesel from Algae Open Source<\/a><\/strong><\/p>\n

Oilgae – Oil & Biodiesel from Algae<\/a><\/strong> provides links, provides directory and web links resources for the algae-based biofuels & biodiesel. It is intended to be useful for research, information, inputs, news for buyers, sellers, manufacturers, traders, suppliers, producers, exporters and importers of algal oil and algal fuels. It will make an effort to provide info on biofuel feedstock, algal feedstocks, algae oil info and link, details on fuel from algae, bio-fuel, bio-diesel, bio-fuels, algal oils production and uses, and biofuels trade & market resources, data, statistics such as price, prices, demand-supply for buyer, seller, manufacturer, trader, supplier, exporter and producer<\/p>\n","protected":false},"excerpt":{"rendered":"

You are at the blog of Oilgae – Oil & Biodiesel from Algae; Oilgae Blog Home Page Found this link from a suggestion at the popular Oil from Algae Yahoo group. This was suggested by a group member David Miller, thanks David! ” The Effects of Light Intensity on the Growth Rates of Green Algae. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-167","post","type-post","status-publish","format-standard","hentry","category-algae-cultivation"],"_links":{"self":[{"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/posts\/167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/comments?post=167"}],"version-history":[{"count":4,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/posts\/167\/revisions"}],"predecessor-version":[{"id":1801,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/posts\/167\/revisions\/1801"}],"wp:attachment":[{"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/media?parent=167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/categories?post=167"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.oilgae.com\/blog\/wp-json\/wp\/v2\/tags?post=167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}