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首页> 外文期刊>The Journal of Experimental Biology >Whole-body composition of Xenopus laevis larvae: Implications for lean body mass during development
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Whole-body composition of Xenopus laevis larvae: Implications for lean body mass during development

机译：非洲爪蟾幼虫的全身组成：对发育过程中瘦体重的影响

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Body composition in developing animals has been extensively investigated in fish larvae and bird embryos. However, no studies to date have attempted to determine whole-animal body composition or lean body mass (MLB) in developing amphibians. The present study investigates how body composition changes during development in Xenopus laevis and the potential implications of MLB for substrate turnover, energy stores, oxygen consumption and other physiological measures, Whole-animal composition was determined during development from eggs (NF stage 1) to 2 weeks post-feeding (NF 50-51), which represents two-thirds of the developmental period. Wet and dry masses were found to be highly correlated, with water content remaining constant at 93 % of wet mass. Whole-animal nucleic acid content was linearly correlated with both wet and dry masses, and declined relative to mass as development progressed. Similarly, total protein content was linearly correlated with wet and dry masses; however, total protein content increased with developmental stage. Amounts of individual neutral lipids were variable although, overall, total neutral lipid content declined progressively with development, The stoichiometric energy balance paralleled the changes seen in mass-specific Mo,, with the energy primarily from lipids fueling respiration up to NF 44-45. Quantification of total body composition revealed that lipid stores greatly influenced the calculations of M-LB and therefore had profound underestimating effects on the mass-specific expression of numerous physiological measures through development. [References: 49]
机译：在鱼类幼虫和鸟类胚胎中，广泛研究了发育中动物的身体成分。但是，迄今为止，尚无研究确定发育中的两栖动物的整体动物体成分或瘦体重（MLB）。本研究调查了非洲爪蟾发育过程中身体成分的变化，以及MLB对底物周转，能量存储，耗氧量和其他生理指标的潜在影响，确定了从卵（NF阶段1）到2发育期间的全动物组成喂养后数周（NF 50-51），占发育期的三分之二。发现湿质量和干质量高度相关，水含量保持恒定为湿质量的93％。全动物核酸含量与湿重和干重均呈线性相关，并且随着发育的进行相对于质量下降。同样，总蛋白含量与干重和湿重呈线性关系。然而，总蛋白含量随着发育阶段的增加而增加。尽管总的中性脂质总含量随着发育而逐渐下降，但各个中性脂质的量却是可变的。化学计量的能量平衡与质量比Mo的变化平行，主要来自脂质的能量为呼吸提供能量，直至NF 44-45。量化整体身体组成表明，脂质存储极大地影响了M-LB的计算，因此对许多生理指标通过发育的质量特异性表达产生了严重的低估作用。 [参考：49]

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