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1. Diurnal fluctuations in photochemical activities of chloroplasts in field grown Cyamopsis tetragonoloba seedlings

Creator:
Lingakumar, K. and Kulandaivelu, G.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
chlorophyll fluorescence, photochemical activities, and photosystems 1 and 2
Language:
Multiple languages
Description:
In field-grown Cyamopsis seedlings, distinct changes were found in the rates of photosystems (PS) 2 and 1 activities at different time of the day. Maximum PS2 activity was at around 11:00 h and decreased thereafter. On the contrary, PS1 activity continued to increase up to 14:00 h and declined in evening hours. Significant energy transfer from PS2 to PS1 was evident during the morning and evening hours of the day whereas a slow excitation of PS2 and energy transfer was favoured during noon hours. and K. Lingakumar, G. Kulandaivelu.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Phosphorylation of photosystem 2 proteins and mígration ínto intergrana thylakoids

Creator:
Kochubei, S.M., Volovik, O.I., and Sytnik, S.K.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Phosphotylatíon of some polypeptides of photosystem 2 (PS2) core was observed for chloroplasts phosphoiylated under anaerobic conditions. These polypeptides appeared in the photosystem 1 (PSI) paiticles isolated from phosphorylated chloroplasts. Phosphorylated PS2 was transferred onto PSI as an integrál complex, which retained photochemical activity and originated variable fluorescence.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Photon-harvesting efficiency and arbuscular mycorrhiza in amphibious plants

Creator:
Šraj-Kržič, N., Pongrac, P., Regvar, M., and Gaberščik, A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
aerenchyma, anthocyanins, carotenoids, chlorophylls, intermittent aquatic habitats, photochemical efficiency, photosystem 2, species differences, and symbiosis
Language:
Multiple languages
Description:
The amphibious plant species of intermittent aquatic habitats thrive both submerged and emerged. In order to outline the adaptive characters of these two life forms photochemical efficiency of photosystem 2, leaf contents of chlorophyll (Chl) a and b, carotenoids (Car), anthocyanins (Ant), and UV-B absorbing compounds (UV-B abs), and root aerenchyma and arbuscular mycorrhizal (AM) colonisation were studied in Glyceria fluitans, Gratiola officinalis, Ranunculus lingua, Teucrium scordium, Sium latifolium, Sparganium emersum, and Veronica anagallis-aquatica. Water level fluctuations did not exert a severe effect on photon harvesting efficiency. Submerged specimens had higher contents of Car and Ant whereas higher contents of UV-B abs were found in emerged specimens indicating efficient protection against the harmful effects of solar radiation. Roots of all species studied had extensive aerenchyma and were colonised by AM fungi, which were significantly more abundant in emerged specimens. This is the first report on AM symbiosis in S. latifolium and S. emersum. and N. Šraj-Kržič ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Photosynthetic characteristics of two new chlorophyll b-less rice mutants

Creator:
Lin, Zhi-Fang, Peng, Chang-Lian, Lin, Gui-Zhu, Ou, Zhi-Ying, Yang, Cheng-Wei, and Zhang, Jing-Liu
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
chlorophyll absorption spectrum, chlorophyll accumulation and degradation, carotenoids, photosystem 2 activity, ribulose-1,5-bisphosphate carboxylase/oxygenase, thermal dissipation, and total electron transport rate
Language:
Multiple languages
Description:
Two yellow rice mutants VG28-1 and VG30-5 were obtained during the tissue culture process from a rice plant (cv. Zhonghua No.11 japonica) with inserted maize Ds transposon element. Absorption spectra and pigment composition showed that two mutants had no chlorophyll (Chl) b and lower Chl a content in comparison to the wild type (WT). Net photosynthetic rate (PN), total electron transport rate (JF), photochemical quenching (qp), quantum yield of PS2 dependent non-cyclic electron transport (ΦPS2), fraction of Prate, and leaf area were lower but Fv/Fm and apparent quantum yield (AQY) remained at similar levels as in the WT plant. Xanthophyll cycle pool size (V+A+Z) on a Chl basis, and de-epoxidation state were enhanced in the mutants. The mutants had larger amounts of soluble protein and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO), especially the small subunit of RuBPCO, than WT. The characteristics of two rice mutants differed somewhat from the other common Chl b-less mutants originating from mutagenic agent treatments. and Zhi-Fang Li ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

7. Rozpínání vesmíru a interferometrické měření poloměru hvězd na 48. mezinárodní fyzikální olympiádě v Indonésii

Creator:
Konrád, Ľubomír, Kříž, Jan, Studnička, Filip, and Vybíral, Bohumil
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
2017, fyzikální olympiáda, physics olympiad, úlohy, problems, exercises, etc., Indonésie, Indonesia, rozpínání vesmíru, poloměr hvězd, expanding the universe, radius of stars, 6, and 53
Language:
Czech and Slovak
Description:
Ľubomír Konrád, Jan Kříž, Filip Studnička, Bohumil Vybíral. and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public