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双孢蘑菇原生质体分离与再生初探 被引量:7
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作者 王波 唐利民 +1 位作者 熊鹰 姜邻 《西南农业学报》 CSCD 2004年第2期215-216,共2页
双孢蘑菇菌丝体的原生质体再生菌株表现出3种类型,即匍匐型,比例为75 5%,与亲株菌丝体长势相似;气生型,比例为17 7%;贴生型,比例为6 8%;双孢蘑菇原生质体再生菌落表现出多样性。
关键词 双孢蘑菇 质体 菌株 菌丝体 匍匐 贴生型
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Analysis of Transition of Pension System in an Endogenous Model
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作者 叶栩青 《Journal of Donghua University(English Edition)》 EI CAS 2004年第4期23-25,共3页
In this paper we investigate the possibility of pareto improving social security reforms within a framework of endogenous growth. Belan et al. proposed a transition from a pay-as-you-go(PAYG) pension system to a syste... In this paper we investigate the possibility of pareto improving social security reforms within a framework of endogenous growth. Belan et al. proposed a transition from a pay-as-you-go(PAYG) pension system to a system of saving-subsidization. We follow this approach and prove that a pareto improving conversion from the PAYG system to a fully funded system is possible and discuss the problem of implementing the transition to the fully funded system. 展开更多
关键词 social security PAYG funded endogenous growth.
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