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. 2014 Nov 4;10:302. doi: 10.1186/1746-4811-10-35

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© Dean et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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The physical characteristics of the grape berries. The concentrations of soluble solids of the grape berries (Green ♦), as well as the fresh weight (Blue ▲) and dry weights (Red ▼) of the berries, are presented with respect to the number of days after flowering. A sigmoidal function (solid green curve) of the form a ₁ + (a ₂ - a ₁)/(1 + exp(-(DAF - x ₀)/w)) was fitted to the soluble solids values by nonlinear regression (adjusted R² = 0.99), where a ₁ = 26.1 (the approximate maximum soluble solids value), a ₂ = 3.9 (the approximate minimum soluble solids value), x ₀ = 69.7 (the inflection point) and w =7.4 (the change in DAF which yielded the greatest change in the soluble solids value). The error bars are given by the standard deviation of soluble solids values at each time point.