Consulta: subjectFacets:"Logistic equation"
Registros recuperados: 3
Data/hora: 30/05/2024 13:30:57

Is whole-plant photosynthetic rate proportional to leaf area? A test of scalings and a logistic equation by leaf demography census.
Provedor de dados: 19
Autores: KOYAMA, Kohei; KIKUZAWA, Kihachiro; 小山, 耕平.
Allometric scalings and a logistic equation assume that whole-plant photosynthetic rate under resource-unlimited conditions is proportional to leaf area. We tested this proportionality for the herb Helianthus tuberosus. During growth, we repeatedly measured the percentage of leaves with high, medium, and low photosynthetic capacity to estimate the whole-plant sum of photosynthetic capacity. We found that the whole-plant sum of the light-saturated photosynthetic rate of leaves is proportional to the whole-plant leaf area, disregarding the dynamics of the leaf population. We also found that the daily photosynthesis of each leaf appeared as a linear function of the light-saturated photosynthetic rate of that leaf, as predicted by the optimization theory....
Palavras-chave: Metabolic scaling theory; Whole‐plant photosynthesis; Allometry; Leaf demography; Logistic equation; Helianthus tuberosus (Jerusalem artichoke).
Ano: 2009
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4369

Semi-lethal high temperature and heat tolerance of eight Camellia species
Provedor de dados: 85
Autores: He,XY; Ye,H; Ma,JL; Zhang,RQ; Chen,GC; Xia,YY.
Annual leaf segments of eight Camellia species were used to study the heat tolerance by an electrical conductivity method, in combination with a Logistic equation to ascertain the semi-lethal high temperature by fitting the cell injury rate curve. Te relationship between the processing temperature and the cell injury rate in Camellia showed a typical "S" shaped curve, following the Logistic model. Te correlation coeficient was above 0.95. Te semi-lethal high temperature LT50 of the eight Camellia species, determined by the infection point on the curve, varied from 50 to 57 LT50 / °C, following the descending order: Camellia oleifera &gt; C. japonica &gt; C. polyodonta &gt; C. semiserrata &gt; C. nitidissima &gt; C. gigantocarpa &gt; C. nanyongensis &gt; C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Camellia; Logistic equation; Semi-lethal high temperatures; Heat tolerance.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200007

Allometric scaling of biological rhythms in mammals
Provedor de dados: 48
Autores: Günther,Bruno; Morgado,Enrique.
A wide spectrum of cyclic functions in terrestrial mammals of different size, from the 3-gram shrew to the 3-ton elephant, yields an allometric exponent around 0.25, which is correlated _ as a kind of common denominator _ with the specific metabolic rate. Furthermore, the applicability of these empirical findings could be extrapolated to chronological events in the sub-cellular realm. On the other hand, the succession of growth periods (T98%) until sexual maturity is reached also follows the 1/4 power rule. By means of Verhulst's logistic equation, it has been possible to simulate three different biological conditions, which means that by modifying the numerical value of only one parameter, revertible physiological and pathological states can be obtained,...
Tipo: Journal article
Palavras-chave: Growth; Dimensional analysis; Specific metabolic rate; Logistic equation; Homeostasis.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200010