A preventive or remedy for infection, an anti-endotoxin agents, a vaccine adjuvants and a growth promoter each comprising a sugar cane-derived extract as an active ingredient which agent is safe to man and animals. The source of conditioning agent may be a liquid or a solid which solid has water from the flush tank flow over it. A heavily doped polysilicon region may be formed beneath the carbon-containing buried strap, which reduces the trench semiconductor material resistance.