By Jun Miyake

Hydrogen is a nearly excellent gas and its wider use will lead to an development within the surroundings as a result of elements together with reduced pollution. Hydrogen is the component of maximum abundance within the universe; notwithstanding, its construction from renewable assets is still an immense problem. The papers awarded inside this quantity improve and extend upon displays made on the ''Workshop on Biohydrogen 99'', Tsukuba, Japan. The contents review the present prestige of Biohydrogen examine world wide and look at destiny learn instructions. Contributions from major foreign specialists conceal the breadth of Biohydrogen R and D, from creation to genetic engineering and molecular biology. This quantity is designed to be a useful source for researchers and different execs who desire to receive an outline of Biohydrogen R and D.

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05 cal/ml) and thereafter divided by the irradiation area. m2). On the other hand, the light energy consumed is easily converted from W/m 2 to the same unit. A problem arises when light irradiation is only expressed in lux unit. S. J. H. , 1996). The efficiency calculated with the last proportion is presented, in this column, between brackets. However, in both cases the efficiencies calculated were not trustworthy. In these cases, as well as in others were the culture volume or, mainly, the irradiation area, had to be assumed, the values obtained for efficiencies can not be very accurate and they are pointed out with an asterisk.

Sasaki, K. (1998). R. 133142. , and Asada, Y. (1995). Accumulation of poly-(hydroxybutyrate) by a non-sulfur photosynthetic bacterium, Rhodobacter sphaeroides RV at different pH. Biolechnol. Lett. 17, 395-400. Takahashi, T. (1984). Hydrogen production nitrogenase of photosynthetic bacteria, in Kougousei Saikin (Photosynthetic Bacteria), Kitamura, H. ), Gakkai Shyppan Center, Tokyo, pp. 196-204. , Kaneyasu, T. and Naomichi, N. (1999). Removal of phosphorous from sediment mud in oyster farm using a photosynthetic bacterium, Rhodobcter sphaeroides IL 106.

Hydrogen Production From Acetic acid To utilize organic wastes production, acetic and propionic acid should be utilized by photosynthetic bacteria because organic wastes are usually converted to volatile fatty acids (VFA) such as acetic, propionic and butyric acids during anaerobic digestion. Especially, acetic and propionic acid are major VFA in the digestion liquor. Therefore, acetic and propionic acids were used for hydrogen production as a carbon and energy source with Modified medium. As shown in Fig.

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