构建一个元动物的生物能量成本
1Center for Mechanisms of Evolution, Biodesign Institute, Arizona State University, Tempe, AZ 85287.
概括
多细胞生命比单细胞生命需要显著更多的能量来生产生物质,在发育过程中,成本随着大小的增加而增加. 这种较高的生物能成本,以腺三酸盐 (ATP) 水解来衡量,影响了生长和繁殖率.
科学领域:
- 生物能源学 生物能源学
- 进化生物学 进化生物学
- 细胞生物学 细胞生物学
背景情况:
- 所有生命都依赖于将能量转化为生物质,以实现生长和繁殖.
- 单细胞生物表现出能量成本与细胞重量的线下缩放.
- 多细胞生物,尽管保留了一些缩放,但在生物质生产中承担了更高的基线能源成本.
研究的目的:
- 研究单细胞和多细胞生命中生物质生产的生物能成本.
- 为了比较个体发育中的特定尺寸能量缩放与跨物种的能量缩放.
- 将能源成本转化为腺三酸盐 (ATP) 水解,以了解细胞机械需求.
主要方法:
- 在单细胞和多细胞异构体中对能源成本的比较分析.
- 检查大小特异性缩放在*Daphnia*物种和其他元动物.
- 将生物能成本转化为腺三酸盐 (ATP) 的水解.
主要成果:
- 多细胞性导致相对于单细胞生命而言,相对于非细胞功能而言,相比单细胞生命, soma 替代的能源成本产生了"量子跃升".
- 在各个物种中,更大的成年体型与每单位生物质能耗较低的相关性.
- 在个体物种的发展过程中,生物质生产成本随大小而增加.
结论:
- 多细胞化的进化涉及到基线生物能源成本的大幅增加.
- 了解这些成本对于预测生物体的生长,繁殖和进化潜力至关重要.
- 细胞机械和生物质翻倍时间的能源需求受到这些生物能源成本的限制.
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