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3. 60 let světla v Ústavu fotoniky a elektroniky AV ČR, v.v.i.

Creator:
Peterka, Pavel and Zavadil, Jiří
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
optics, photonics, light, optika, fotonika, and světlo
Language:
Czech
Description:
In 1955, the work started in the Institute for Theoretical Radio Engineering of the Czechoslovak Academy of Sciences, the predecessor of today’s Institute of Photonics and Electronics of the Czech Academy of Sciences. In the year 2015, proclaimed as the International Year of Light by the UNESCO, let us recall selection of the milestones of the past 60 years of scientific research in our institution, particularly those related to photonics and light. and V roce 1955 zahájil svou činnost Ústav teoretické radiotechniky Československé akademie věd, předchůdce dnešního Ústavu fotoniky a elektroniky Akademie věd České republiky. V roce 2015, vyhlášeným UNESCO za Mezinárodní rok světla, si připomeňme výběr z některých milníků už 60 leté historie vědeckého bádání v našem ústavu, zejména těch se vztahem k fotonice a světlu.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Effects of light quality on growth and development, photosynthetic characteristics and content of carbohydrates in tobacco (Nicotiana tabacum L.) plants

Creator:
Yang, L. Y., Wang, L. T., Ma, J. H., Ma, E. D., Li, J. Y., and Gong, M.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
morfogeneze, světlo, morphogenesis, light, fluorescence chlorofylu, obsah sacharidů, růst, Nicotiana tabacum, chlorophyll fluorescence, content of carbohydrates, growth, 2, and 581
Language:
Multiple languages
Description:
In this study, effects of yellow (Y), purple (P), red (R), blue (B), green (G), and white (W) light on growth and development of tobacco plants were evaluated. We showed that monochromatic light reduced the growth, net photosynthetic rate (PN), stomatal conductance, intercellular CO2, and transpiration rate of tobacco. Such a reduction in PN occurred probably due to the stomatal limitation contrary to plants grown under W. Photochemical quenching coefficient (qP), maximal fluorescence of dark-adapted state, effective quantum yield of PSII photochemistry (ΦPSII), and maximal quantum yield of PSII photochemistry (Fv/Fm) of plants decreased under all monochromatic illuminations. The decline in ΦPSII occurred mostly due to the reduction in qP. The increase in minimal fluorescence of dark-adapted state and the decrease in Fv/Fm indicated the damage or inactivation of the reaction center of PSII under monochromatic light. Plants under Y and G showed the maximal nonphotochemical quenching with minimum PN compared with the W plants. Morphogenesis of plants was also affected by light quality. Under B light, plants exhibited smaller angles between stem and petiole, and the whole plants showed a compact type, while the angles increased under Y, P, R, and G and the plants were of an unconsolidated style. The total soluble sugar content increased significantly under B. The reducing sugar content increased under B but decreased significantly under R and G compared with W. In conclusion, different monochromatic light quality inhibited plants growth by reducing the activity of photosynthetic apparatus in plants. R and B light were more effective to drive photosynthesis and promote the plant growth, while Y and G light showed an suppression effect on plants growth. LEDs could be used as optimal light resources for plant cultivation in a greenhouse., L. Y. Yang, L. T. Wang, J. H. Ma, E. D. Ma, J. Y. Li, M. Gong., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Fotonika v říši hmyzu: pozoruhodné tvarování světla v kutikule brouka skarabea

Creator:
Bouchal, Petr and Bouchal, Zdeněk
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
fotonika, světlo, photonics, light, 6, and 53
Language:
Czech and English
Description:
Říše hmyzu poskytuje výjimečnou rozmanitost optických jevů, často pozorovaných jako duhovost barev. Zajímavým objektem pro zkoumání strukturovanosti barev je brouk Chrysina gloriosa z čeledi vrubounovitých. Způsob ovládání světla na submikrometrové škále, který byl nedávno objeven v tvarových buňkách kutikuly, je inspirací pro současné fotonické technologie., The insect kingdom provides us with an exceptional variety of optical phenomena, commonly observed as iridescence. An interesting example for studying structural coloration is the beetle Chrysina gloriosa (family Scarabaeidae). The recent discovery of its control of light at the sub-micrometre scale, in axicon-shaped cuticle cells, is the inspiration for current photonic technologies., Petr Bouchal, Zdeněk Bouchal., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Images of Light in the Work of Valentin Weigel: Metaphors or Metaphysics? /

Creator:
Žemla, Martin
Type:
text and studie
Subject:
Křesťanská teologie. Dogmatická teologie, Weigel, Valentin,, teologové němečtí, filozofové němečtí, luteráni, světlo, metafyzika, Německo, světové dějiny 1492-1648, jednotlivci (církevní dějiny), teologie, ikonografie, zbožnost, hagiografie, and filozofie, filozofové
Language:
English
Description:
Obrazy světla v díle Valentina Weigela: metafory, nebo metafyzika?
Rights:
unknown

8. K historii složenosti bílého světla /

Creator:
Marek, Jiří
Type:
text and studie
Subject:
Fyzika, <<z >> Freibergu, Theodorich,, Konrád, Baltasar,, Hanel, Melchior,, Marek z Kronlandu, Marci Jan,, Grimaldi, Francesco Maria,, Newton, Isaac,, fyzika, objevy vědecké, světlo, přehledná zpracování světových dějin (chronologicky), české země 1620-1740, and fyzikální vědy
Language:
Czech
Description:
Contribution à l'histoire de la découverte de la composition de lumière blanche.
Rights:
unknown

9. Lotus corniculatus L. response to carbon dioxide concentration and radiation level variations

Creator:
Kostopoulou, P. and Karatassiou, M.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
světlo, light, elevace, index plasticity, ambient conditions, birdsfoot trefoil, elevation, photosynthetic rate, plasticity index, 2, and 581
Language:
Multiple languages
Description:
Carbon dioxide concentration and light conditions may greatly vary between mountainous and lowland areas determining the photosynthetic performance of plants species. This paper aimed to evaluate the photosynthetic responses of Lotus corniculatus, growing in a mountain and a lowland grassland, under low and high radiation and CO2 concentration. Net photosynthetic rate, stomatal conductance, transpiration rate, and intercellular CO2 concentration were measured while the water-use efficiency and the ratio of variable to maximal fluorescence were calculated. Photosynthetic response curves to different levels of radiation and intercellular CO2 partial pressure were estimated. Our results showed that high radiation and CO2 concentration enhanced water-use efficiency of plants at both sites, enabling them to use more efficiently the available water reserves under drought conditions. The increase of radiation and CO2 concentration would enhance the photosynthetic performance of the mountainous population of L. corniculatus, which overall seems to express higher phenotypic plasticity., P. Kostopoulou, M. Karatassiou., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public