Tag Archives: Biotechnology

Water-soluble branched copolymers dextran-polyacrylamide and their anionic derivates as matrices for metal nanoparticles in situ synthesis

Water-soluble branched copolymers dextran-polyacrylamide and their anionic derivates as matrices for metal nanoparticles in situ synthesis BEZUGLY M., KUTSEVOL N., RAWISO M., BEZUGLA T. Please cite as: CHEMIK 2012, 66, 8, 862-867 Metal nanoparticles were synthesized in water-soluble polymer matrices with different internal macromolecule structures. Linear Polyacrylamide (PAA) and branched star-like copolymers Dextrangraft- Polyacrylamide (D-g-PAA) and their anionic derivatives were used for in situ synthesis of Ag and Pd nanosystems. The influence of the matrix nature and internal structure of macromolecules in solution on the nanoparticles formation was studied. Keywords: branched copolymers, dextran, polyacrylamide, polyacrylic acid, nanoparticles Read more: pdf-icon...
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Genetically modified plants – from the laboratory to practical use in European agriculture. Part I

Genetically modified plants - from the laboratory to practical use in European agriculture. Part I LINKIEWICZ A., DĄBROWSKI Z.T., SOWA S. Please cite as: CHEMIK 2012, 66, 8, 843-855 Biotechnological techniques enable the breeder to combine a number of favourable properties of different organisms. A genetically modified plant contains gene or genes that have been modified by humans using genetic engineering. Since 1996 a constant expansion of the area of genetically modified crops is observed throughout the world, reaching 160 million has. in 2011. It is likely that in the future stacked events will dominate in new GM varieties, combining properties such as resistance to pests and tolerance to herbicides and adverse environmental conditions, as well as various quality properties. The European Union and other countries have implemented comprehensive legal regulations on matters related to GMO. The EU has one of the more restrictive legal systems on GMO. Those regulations ensure the protection of the environment, human and animal health, and proper information for the consumer. The regulations also stipulate detailed analysis of each GMO at...
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Microbial transformation of xenobiotics

Microbial transformation of xenobiotics

GREŃ I. Please cite as: CHEMIK 2012, 66, 8, 835-842 As the result of human activity large amount of chemically different xenobiotics enter the environment every day. Physical and chemical properties of these compounds contribute to their accumulation in the environment, and their toxicity is dangerous for all living organisms. That?s why microorganisms have been engaged for fight with xenobiotics through performing their biodegradation, mineralization or transformation. In this way microorganisms contribute to decrease the amount of xenobiotics in environment. Keywords: xenobiotics, biodegradation, bioavailability, transformation, cometabolism Read more: pdf-icon...
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Biological methods for obtaining hydrogen

Biological methods for obtaining hydrogen MORITZ M. Please cite as: CHEMIK 2012, 66, 8, 827-834 Due to the considerable combustion heat value and common access, hydrogen constitutes a convenient energy carrier. The biological processes for obtaining hydrogen include the following: biophotolysis of water, fermentation and electrochemical processes (bio-electrolysis of water). During the bioproduction of hydrogen mainly renewable energy sources are used such as solar energy and organic substrates contained in industrial waste and waste materials. The development of these methods may become one of the ways of obtaining cheap and pure energy. Keywords: hydrogen, biophotolysis of water, fermentation, photofermentation, bio-electrolysis, industrial waste Read more: pdf-icon...
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The applicability of genetically modified microorganisms in bioremediation of contaminated environments

The applicability of genetically modified microorganisms in bioremediation of contaminated environments WASILKOWSKI D., SWĘDZIOŁ Ż., MROZIK A. Please cite as: CHEMIK 2012, 66, 8, 817-826 Genetic engineering is a modern technology, which allows to design microorganisms capable of degrading specific contaminants. The construction of GMMs for bioremediation purposes is possible because many degradative pathways, enzyme and their respective genes are known and biochemical reactions are well understood. For selection and identification of GMMs in the environment many molecular techniques were developed. They include FISH, in situ PCR, DGGE, TGGE, T-RFLP, ARDRA and marker genes (lux, gfp, lacZ, xylE). In order to reduce potential risk of the use of GMMs in the environment some genetic barriers were created. They limit survival of the recombinants and gene transfer into autochthonous microorganisms. In this review the construction and practical applications of GMMs in bioremediation studies are discussed. Keywords: GMMs, contaminants, degradation, bioremediation Read more: pdf-icon...
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Rainbow code of biotechnology

Rainbow code of biotechnology KAFARSKI P. Please cite as: CHEMIK 2012, 66, 8, 811-816 Biotechnology is considered as a driving force of progress and simultaneously as a major threat of humanity. Although there several classifications of biotechnology, the one using color code is most popularly used. Most commonly four major colors are considered, namely red, green, white and purple. However classifications using many more colors, nearly all tones of rainbow, also exist. Keywords: biotechnology, mission, classification, controversies Read more: pdf-icon...
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