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1·This paper considers a class of deterministic models of simple food chains with deffusion and groop defence.

本文考虑一类具有扩散和群体防卫能力的简单食物链模型。

2·Results: Of 52 children, 40(77%)belonged to Dexamethasone good responder(DGR) groop including 6 in high risk and 34 in low risk.

结果：52例患儿中对地塞米松诱导试验敏感（DGR） 者为40例， 占77%，其中?危患儿6例，标危患儿34例。