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1. Does the effect of AVP on hypothalamic neurones support its proposed role in endogenous antipyresis?

Creator:
Moravec, J. and Pierau, Fr.-K.
Type:
article, model:article, and TEXT
Subject:
hypothalamic neurones, temperature sensitivity, fever, and arginine-vasopressin
Language:
English
Description:
The effect of AVP on unit activity and temperature sensitivity was tested in hypothalamic slices of the rat. The results demonstrate that AH/PO neurones in vitro react to AVP by significant changes of both static discharge and temperature sensitivity supporting the idea of direct modulation of thermoregulatory neurones by AVP.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Genotypic variation in chlorophyll fluorescence parameters, photosynthesis and growth of tomato grown at low temperature and low irradiance

Creator:
Janssen, L.H.J., Van Oeveren, J.C., Van Hasselt , P.R., and Kuiper, P.J.C.
Format:
print
Type:
model:internalpart and TEXT
Subject:
carotenoids, temperature sensitivity, relative growth rate, net photosynthetic rate, net assimilation rate, Lycopersícon esculentum Milí., leaf area ratio, growth analysis, fluorescence induction, and cultivars
Language:
Multiple languages
Description:
The genetic variation in low temperature sensitivity of eight tomato genotypes grown at suboptimal temperature (19 °C) and at low irradiance (140 pmol m'2 s**) was assessed at the plant, chloroplast and thylakoid membrane levels. Temperature effects on the thylakoid membrane were determined by measuring the maximum fluorescence (Fp) and the maximal fluorescence rise (ADP) of induction traces of leaf discs at decreasing temperatures (30, 28, ... 0 °C). Two discontinuities were found in Fp versus temperature curves: a low temperature break at ca. 12 °C (LTB) and a high temperature break at ca. 22 °C (FITB). Below LTB, sFp and sDP were determined as the temperature induced changes in Fp, respectively ADP. Chloroplast functioning was determined by measuring net CO2 fixation rate (E^) of leaves. Plant performance was determined by measuring the increase in leaf area and sho ot dry mass in time. Correlations between the various parameters were analysed across the genotypic variation found. Chlorophyll (Chl) fluorescence parameters were not correlated with plant performance at suboptimal growth conditions. of leaves was correlated with plant performance, but only at ambient CO2. Effects of stomatal resistance on were large. The Chl fluorescence parameters LTB, sFp and sDP could distinguish between tomato genotypes. Nevertheless, the ranking of the genotypes depended on the specific parameter selected, indicating that each parameter assessed a different aspect of the heterogeneous temperature dependence of Chl fluorescence induction. Their genetic variation suggested that the genotypes differed in the organisation and fimctioning of the thylakoid membrane. These differences were not reflected in of leaves or plant performance.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public