• Journal of Practical Agriculture & Fisheries Research
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• v.3 no.1
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• pp.116-131
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• 2001

Experiments were conducted to determine effects of whole and processed corns on in situ disappearance rates of nutrients in the rumen and in vitro degradability of dry matter by rumen microorganisms. Whole corn(WC) was processed into four different types; ground corn(GC), cracked corn(CC), flaked corn(FC), and soaked corn(SC). In the in situ experiment, the rate of ruminal DM disappearance after 48 hour incubation was highest in GC(76.1%) and lowest in WC and SC(12% ; P<0.01). The rate of ruminal CP disappearance after 48 hour incubation was highest in GC and CC(48 and 38%, respectively; P<0.01). The rate of ruminal OM disappearance after 48 hour incubation was highest in GC(76.14%) and lowest in WC and SC(11.82 and 12.26%, respectively; P<0.01). In the in vitro experiment, the two-stage incubation technique was used to measure digestibilities of whole and processed corns. The digestibility of DM was higher in GC, CC and FC(86.95, 85.84 and 82.29%, respectively) than in WC(15.36%; P<0.01).

• Journal of Practical Agriculture & Fisheries Research
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• v.3 no.1
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• pp.132-141
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• 2001

This study was conducted to determine effects of whole and processed corns on attachment characteristics of rumen microbes in Hanwoo. Whole corn(WC) was processed into four different types; ground corn(GC), cracked corn(CC), flaked corn(FC), and soaked corn(SC). After each processed corns was incubated in the rumen of Hanwoo for 12 h and 24 h, attachment characteristics of rumen microbes and morphological changes of feed substrates was examined by utilizing scanning electron microscopy(SEM). In this study, the treatment group of GC and CC showed the highest in the attachment of rumen microbes. On the other hand, microbial attachments to the starch particle of WC and SC were hardly detected. However, with the increase of incubation time the surface of WC and SC was covered by many microbes, resulting in enhancing the surface degradation.

• Korean Journal of Food Science and Technology
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• v.27 no.1
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• pp.30-35
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• 1995

Gamma irradiation was applied to non-glutinous and glutinous corns for improving starch isolation process. No significant changes in proximate composition of corn grains were observed by gamma irradiation. Irradiation at 1 and 5 kGy was effective for sterilizing all contaminated microorganisms of non-glutinous and glutinous corns, respectively. The moisture-uptake rate constants were increased in proportional to the steeping temperature and applied irradiation dose level. The irradiation efficacy on water absorption properties was also recognized in the corns stored for six months at room temperature. The combined use of gamma irradiation with sulfur dioxide solution was very effective for reducing steeping time. The starch yield gradually increased as irradiation dose levels increased. At 2 kGy, the sarch yield of non-glutinous and glutinous corns increased by 38% and 27%, respectively. No significant difference in Hunter's color value was observed between the starches isolated from nonirradiated and irradiated corn grains.

• Journal of Mushroom
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• v.2 no.1
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• pp.10-14
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• 2004

Effect of solid grain media on the mycelial growth of Pleurotus ostreatus and its biofunctional activities were investigated using seven kinds of grains. Foxtail millet and barley were good for growth of hypha of P. ostreatus. However, growth of the mycelium was very slow in the solid grain media containing wheat, corn and brown rice. Mycelial growth of P. ostreatus according to water content of solid grain media was good at 25% to 30%. Mycelial growth of P. ostreatus according to heating-time and temperature of solid grain media was good for 30 min at $121^{\circ}C$. Anticancer activities against lung cancer cell line of the myceial extracts from P. ostreatus grown on several grain media were strong in the corn, defatted soybean, brown rice, barly and black bean in order. Fibrinolytic activities of the myelial extracts were strong in order defatted soybean, wheat, foxtail millet, barley, brown rice and black bean. The mycelial extracts were showed good antibacterial activities against Pseudomonas aeroginosa and Staphylococcus aureus.