One tool for assessing the impact of forestry on the ecosystem is population viability analysis (PVA).
一个评估森林在生态系统中影响的工具是人类生存分析(pva)。
Early attempts to predict population viability were based on demographic uncertainty Whether an individual survives from one year to the next will largely be a matter of chance.
早期尝试去预报人类生存能力基于种群数量统计学的不确定，无论一个单独的幸存者从一年到了下一年因为一个重要的机会而增多。
Yet ultimately the funding decision is by a team that will evaluate based solely on the viability of the project and what will have the most benefit for the population it will serve.
但是最终这个资助决定是由一个团队来做的。 团队将仅基于项目可行性和它服务对象将会获得多大的收益做出评估。
Results Population doubling time of corneal stromal cells prolonged significantly since passage 7. MTT assay also showed cell viability of passage 7 decreased to 60% of passgage 1 (P< 0. 01 ).
细胞群体倍增时间由第7代起显著延长（P<0.01）；MTT比色法的结果亦显示，第7代细胞的增殖能力开始大幅下降（P<0.01）。
Results Population doubling time of corneal stromal cells prolonged significantly since passage 7. MTT assay also showed cell viability of passage 7 decreased to 60% of passgage 1 (P< 0. 01 ).
细胞群体倍增时间由第7代起显著延长（P<0.01）；MTT比色法的结果亦显示，第7代细胞的增殖能力开始大幅下降（P<0.01）。
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