Compost is generally used as an organic fertilizer or soil conditioner, and its effects on soil quality and plant growth have been
thoroughly investigated. Recently we have reported that a compost fermented marine animals could impart physiological
benefits to plants as well as animals. The biphasic functions of the compost are as follows: 1) Application of the compost to soil
results in an increase of crop yield, and suppression of plant diseases caused by several plant pathogens. In addition, decreased
nitrate and increased amino acids in plants are also observed. 2) Oral administration of the compost to flatfish reduces the
number of dead flatfish in the nursery. When the compost extract has continuously been given to pigs in swine farms, the rate of
stillbirth is decreased and the growth of piglets is promoted. In rodent models, the level of fecal immunoglobulin A, a gut mucosal
barrier, raises following the compost exposure. Interestingly, oral administration of the compost extract reduces visceral fat in the
mice mimic metabolic syndrome. Microbial analyses reveal that the compost contains Bacillus sp. expressed cyclic lipopeptides
with antagonistic activity to plant fungal pathogens, and bacterial strains such as Bacillus sp. and Brevibacillus sp. to activate
denitrification or nitrogen fixation. Furthermore, Bacillus sp. possible to modulate immune response and nutrient utilization in
rodents have been isolated from the ceca of germ free mice fed the compost extract. Thus, further investigation on the functions
of thermophilic isolates from the compost is necessary.
Hirokuni Miyamoto has completed his Ph.D at the age of 33 years from Keio School of Medicine, and studies on the effects of thermophiles on the
plants and animals maintained in Japan Eco-sceince co., ltd. (Nikkan Kagaku as Japanese name), Chiba University and Keio School of Medicine.
He is president of Japan Eco-sceince co., ltd. He has published more than 15 papers in reputed journals, 6 papers in books, 8 papers in Japanese
journal, and 20 patents in Japan Patent Office. He has supervised on two contract researches for Ministry of Economy, Trade and Industry of Japan.
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