Professor Emeritus Research Interests: The main objective of my work relates to the physiology of microalgae as related to mass culturing outdoors. In a nutshell the work so far points out that our original approach taken some 35 years ago of treating algal growth outdoors in terms of light limitation or a process governed by one main limiting factor was a naive attempt to simplify things. Our findings point out that in many cases the system is down regulated or even photoinhibited not necessarily because of exposure to high light intensity but rather due to other environmental stress that reduce the photosynthetic activity be it temperature or salinity. As a result the ability of the cells to utilize light by the photosynthetic machinery is reduced and thus light levels that are considered as harmless under optimal growth conditions are turning to be over-saturating levels and result in down regulating and photoinhibiting the photosynthetic apparatus.
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Professor Emeritus Research Interests: The main objective of my work relates to the physiology of microalgae as related to mass culturing outdoors. In a nutshell the work so far points out that our original approach taken some 35 years ago of treating algal growth outdoors in terms of light limitation or a process governed by one main limiting factor was a naive attempt to simplify things.
Our findings point out that in many cases the system is down regulated or even photoinhibited not necessarily because of exposure to high light intensity but rather due to other environmental stress that reduce the photosynthetic activity be it temperature or salinity. As a result the ability of the cells to utilize light by the photosynthetic machinery is reduced and thus light levels that are considered as harmless under optimal growth conditions are turning to be over-saturating levels and result in down regulating and photoinhibiting the photosynthetic apparatus.
Based on this working hypothesis we are also reviewing some of our old data related to the role of light and temperature in outdoor cultures and getting a better understanding that algal cultures are shifted during the day from light limitation to light inhibition in a relatively very fast cycle. The major organism studied was Spirulina or under it scientific name Arthrospira platensis. A large collection of strains collected during the years from all over the world is used in our studies.
In recent years a significant part of the work is dedicated to selection of species Nannochloropsis either from different habitats or after induced random mutations with the attempt to isolate strains of higher adaptability capacity to biotic stress. Ben-Gurion University, Department of Biology. Advisor: Prof. Richmond Thesis: The response of A. Richmond Thesis: The effect of light, dark and kinetin on the protein synthesis activity of isolated chloroplasts.
Spirulina platensis Arthrospira : Physiology, Cell-biology and Biotechnology. Chapters in Books: Vonshak, A. Algae: growth techniques and biomass production. In Techniques in Bioproductivity and Photosynthesis.
Coombs and D. Hall Eds. Pergamon Press, London, Vonshak, A. Problems in developing the biotechnology of algal biomass production. In Biosaline research - a look into the future. Pasternak, D. San-Pietro Martinus Nijhoff Eds. Junk Pub. Microalgae: laboratory techniques and outdoor biomass production.
This volume has been translated to Spanish, Portuguese, Chinese and Russian. Coombs, C. Analytical Techniques. Reprinted and Corrected Edition, J. Coombs, D. Hall , S. Long and J. Scurlock Eds. Laboratory techniques for the culturing of microalgae.
In Handbook for Algal Mass Culture. Richmond, A. In Micro-algal Biotechnology. Borowitzka, M. Borowitzka, Eds. Cambridge University Press, Photoinhibition in outdoor cultures of the cyanobacterium Spirulina platensis. Barber, J. Malkin, Eds. Cohen, Z. The effect of temperature and cell concentration on fatty acid composition of outdoor cultures of Porphyridium cruentum. In Algal Biotechnology, T.
Stadler et al. Photoinhibition as a limiting factor in outdoor cultivation of Spirulina platensis. Microalgae: laboratory growth techniques and the biotechnology of biomass production. Boussiba, S. Methods for enhancement and determination of astaxanthin accumulation in the green alga Haematococcus pluvialis. In Methods in Enzymology, Vol. Microalgal biotechnology: is it an economical success? In: Biotechnology: Economic and Social Aspects. DaSilva, E. Cambridge University Press, U.
Chapters written in Vonshak, A. Spirulina: Growth, Physiology and Biochemistry. Genetics of Spirulina. Use of Spirulina Biomass. Arthrospira Spirulina : Systematics and Ecophysiology. In: The Ecology of Cyanobacteria. Whitton, B. Kluwer Academic Publishers, Netherlands, , pp. Torzillo, G. Biotechnology for Algal Mass Cultivation. Biomaterials an Bioprocessing. Fingerman, M.
Science Publishers, Inc. Environmental stress physiology. Blackwell Science, , pp. Refereed articles in scientific journals: 1. Initial stages in the onset of senescence in tobacco leaves. Plant Physiol. Spirulina culture in Israel. Genome multiplication as related to the growth rate in blue-green algae Anacystis nidulans. Plant and Cell Physiology, 22 8 : , Production of Spirulina biomass: effects of environmental factors and population density.
Biomass, 2: , Production of Spirulina biomass: maintenance of pure culture outdoors. Duyvesteyn, M. Wolk, C. The feasibility of mass cultivation of Porphyridium. Biomass, 8: , Plant and Soil, , Ben-Yaakov, S. An automatic method for on-line estimation of the photosynthetic rate in open algal ponds.
Management of Spirulina mass culture. Beihefte zur Nova Hedwigia, , The potential use of Porphyridium biomass for valuable natural products. Lipid and biomass production by the halotolerant microalga Nannochloropsis salina. Biomass, , Fatty acid composition of Spirulina strains under various environmental conditions.
Phytochemistry, , Strain selection of Spirulina suitable for mass production. Biological limitations in developing the biotechnology for algal mass cultivation. Outdoor cultivation of the marine microalga Isochrysis galbana in open raceways. Aquaculture, ,
Avigad Vonshak Explained
Biography[ edit ] Vonshak was born in Germany in and immigrated to Israel with his parents in He received his Ph. The main goal of these studies is to try to understand the mechanisms involved in the adaptation of dense algal cultures to the extreme environment existing in many drylands. Vonshak is known internationally mainly for his contribution to the development of the biotechnology for mass culturing of the blue-green algae cyanobacteria Spirulina under large-scale conditions. The concept was developed as part of the approach that sustainable development of drylands requires the need to develop new innovative biotechnologies that will make use of the environmental condition of drylands and increase the water use efficiency as compared to conventional agriculture methodologies.
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