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2. Comparative study of the effects of salinity and UV radiation on metabolism and morphology of the red macroalga Acanthophora spicifera (Rhodophyta, Ceramiales)
- Creator:
- Pereira, D. T., Simioni, C., Ouriques, L. C., Ramlov, F., Maraschin, M., Steiner, N., Chow, F., Bouzon, Z. L., and Schmidt, É. C.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- řasy, metabolity, mikroskopie, Algae, metabolites, microscopy, životaschopnost buněk, tempo růstu, cell viability, growth rate, 2, and 581
- Language:
- Multiple languages
- Description:
- Increase of harmful radiation to the Earth’s surface due to ozone depletion results in higher exposure to harmful ultraviolet- B radiation (UV), while fluctuations in seawater salinity may alter water density, ionic concentration, nutrient uptake, and osmotic pressure. This study evaluated the effects of salinity and UV on metabolism and morphology of Acanthophora spicifera (M.Vahl) Børgesen. Water with 30 and 37 psu [g(salt) kg-1(sea water)] was used for experiments during 7 d of exposure to UV (3 h per day). We demonstrated that UV treatment predisposed, irrespective of salinity, A. spicifera to a decrease in its growth rate and cell viability, as well as affected its morphological parameters. After exposure to PAR + UVA + UVB (PAB), samples showed structural changes and damage, such as increasing cell wall thickness and chloroplast disruption. Our results indicate that UV led to dramatic metabolic changes and cellular imbalances, but more remarkable changes were seen in samples exposed to high salinity., D. T. Pereira, C. Simioni, L. C. Ouriques, F. Ramlov, M. Maraschin, N. Steiner, F. Chow, Z. L. Bouzon, É. C. Schmidt., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Physiological responses of Pterocladiella capillacea (Rhodophyta, Gelidiales) under two light intensities
- Creator:
- Harb, T. B., Nardelli, A., and Chow, F.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- řasy, pigmenty, produktivita, záření, Algae, pigments, productivity, radiation, chlorophyll fluorescence, growth rate, 2, and 581
- Language:
- Multiple languages
- Description:
- Macroalgae must be able to survive in conditions of different light intensities with no damage to their physiological performance or vital processes. Irradiance can stimulate the biosynthesis of certain photoprotective compounds of biotechnological interest, such as pigments and proteins. Pterocladiella capillacea is a shade-grown alga, which play a role key in the balance of marine ecosystems. In addition, it is considered one of the best sources of bacteriological agar and agarose with a wide pharmacological potential. In order to evaluate the photosensitivity in P. capillacea under 60 (control) and moderate light intensity of 300 μmol(photon) m-2 s-1, photosynthetic performance and chemical composition were assessed. P. capillacea showed photosensitivity without evidence of photodamage. The results indicate the possibility to increase a growth rate and probably infer productivity in long-term cultivation by stimulation at moderate light intensity. Increasing photosynthetic pigment and protein contents were also observed under medium light, an interesting result for functional ingredient approaches., T. B. Harb, A. Nardelli, F. Chow., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
4. Tajemství řas a sinic
- Creator:
- Jana Olivová Jana Olivová, Michal Koblížek, Josef Komenda, Martin Tichý, Radek Kaňa, and Kateřina Bišová
- Format:
- print, bez média, and svazek
- Type:
- article, články, journal articles, model:article, and TEXT
- Subject:
- Věda. Všeobecnosti. Základy vědy a kultury. Vědecká práce, Mikrobiologický ústav (Akademie věd ČR), biologie, biotechnologické procesy, řasy, biology, biotechnological process, Algae, Třeboň (Česko), Třeboň Region (Czechia), 12, and 00
- Language:
- Czech
- Description:
- The Algatech Centre, which is a scientific division of the Institute of Microbiology of the CAS located in the Opatovický mlýn (mill) near Třeboň in South Bohemia, focuses on the research of photosynthetic microorganisms, including algae, cyanobacteria and photosynthetic bacteria. The Laboratory of algal biotechnology studies processes and technology involved in the efficient production of algae and the use of algal biomass. It seeks new bio-active compounds in algae to be used as dietary supplements, in pharmacology and biomedicine. Scientists also carry our research into various metabolites of cyanobacteria and their effects on human cells. Special interest is paid to substances inhibiting the division of cancer cells and/or selectively inducing their apoptosis. The Laboratory of anoxygenic phototrophs is engaged in the basic research of evolutionary very old prokaryotes containing photosynthetic reaction centres composed of bacteriochlorophyll and its researchers have recently discovered an entirely new photosynthetic species - a new family of phototrophic bacteria, i.e. bacteria capable of producing energy through photosynthesis. Only three new families of phototrophic bacteria were discovered over the past 100 years.The Laboratory of cell cycles of algae aims at gaining a deeper insight into molecular mechanisms regulating the specific cells cycle in green algae hat divide by multiple fission - that is divide into more than two daughter cells. Scientists´ objective is to leam more about the regulation of cell size and division, the activity of cyclin dependant kinase and cyclin dependant kinase complexes throughout the normal cell cycle as well as their role in the cell cycle interruption in case of DNA damage. The pattern of cell cycle progression in algae can also tell us more about animal embryos, since the early phases of their growth and development are controlled by similar principles as those in green algae., The Laboratory of photosynthesis studies fundamental biochemical and molecular mechanisms regarding photosynthesis, the ways of its regulation during the day or under specific stress conditions. Special attention is paid particularly to photosystem II and researchers in the laboratory have recently made a significant step towards understanding its biogenesis. Photosystem II is a complicated protein complex present in the cells of plants, algae and cyanobacteria, the proper functioning of which is essential for photosynthesis. Research teams from the Algatech centre, together with colleagues from British universities have described the first phases of photosystem II synthesis, namely the mechanism by which chlorophyll molecules are inserted into core proteins of photosystem IIand how the functional core of this complex is assembled. Moreover, they have recently presented a substantially new view of repair mechanisms of photosystem II and the ways of recognition of its damaged protein subunits that have to be degraded and replaced. Deepening the understanding of fundamental processes in algae, cyanobacteria and photosynthetic bacteria can help use their potential in many practical applications, from biomass and biofuels to medicine., and Jana Olivová.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5. Výskyt tropické ruduchy ve Skryjském potoce u Dukovan
- Creator:
- Sedláček, Pavel, Zdeňka Žáková, and Hana Mlejnková
- Format:
- print, bez média, and svazek
- Type:
- article, text, články, journal articles, model:article, and TEXT
- Subject:
- Biologické vědy, ruduchy, nepůvodní druhy rostlin, globální oteplování, řasy, red algae, alien plant species, global warming, Algae, Dukovany (Česko : oblast), Dukovany Region (Czechia), invazní druhy, invazní rostliny, Skryjský potok, Compsopogon aeruginosus, Rhodophyta, 2, and 57/59
- Language:
- Czech
- Description:
- Zástupci rodu Compsopogon (Rhodophyta) jsou tropické druhy řas. Ve střední Evropě se nacházejí v akváriích a v tocích, ovlivněných vypouštěním oteplených odpadních vod. Druh Compsopogon aeruginosus byl nalezen v rakouském přítoku řeky Dyje Pulkavě. Od prvního nálezu v roce 2007 se tato ruducha šířila i do řeky Dyje. V červnu 2012 byla nalezena ve Skryjském potoce, který přivádí odpadní vody z jaderné elektrárny Dukovany. Odpadní voda v době nálezu měla průměrnou roční teplotu 22,8°C, pH 8,5., The representatives of the genus Compsopogon (Rhodophyta) are basically tropical algae. In Central Europe, they are only found in aquaria and in water bodies affected by thermal effluents. The species Compsopogon aeruginosus was found in the Pulkau River (Austria), a tributary of the Thaya. After the first observation of this species in 2007, it also expanded to the Thaya. In June 2012 it was found in the Skryjský stream which is fed waste water from the Dukovany nuclear power station. At the time of this finding, the waste water had an annual average temperature of 22.8°C, pH 8.5., and Pavel Sedláček, Zdeňka Žáková, Hana Mlejnková.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public