Results 191 to 200 of about 17,452 (225)
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2020
Human dependence on number of chemicals or chemical derivatives has increased alarmingly. Among the commodity chemicals, plastics are becoming independent for our modern lifestyle, as the usage of plastics is increasing worryingly. However, these synthetic plastics are extremely persistent in nature and accumulate in the environment, thereby leading to
Javid A. Malik, Monika Bhadauria
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Human dependence on number of chemicals or chemical derivatives has increased alarmingly. Among the commodity chemicals, plastics are becoming independent for our modern lifestyle, as the usage of plastics is increasing worryingly. However, these synthetic plastics are extremely persistent in nature and accumulate in the environment, thereby leading to
Javid A. Malik, Monika Bhadauria
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Bacterial polyhydroxyalkanoates
Biotechnology and Bioengineering, 1996Polyhydroxyalkanoates (PHAs) are polyesters of hydroxyalkanoates (HAs) synthesized by numerous bacteria as intracellular carbon and energy storage compounds and accumulated as granules in the cytoplasm of cells. More than 80 HAs have been detected as constituents of PHAs, which allows these thermoplastic materials to have various mechanical properties ...
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Polyhydroxyalkanoates based copolymers
International Journal of Biological Macromolecules, 2019Polyhydroxyalkanoates (PHAs) belong to a family of natural polyesters and are produced under unbalanced growth conditions as intracellular carbon and energy reserves by a wide variety of microorganisms. Being biodegradable, biocompatible and environmental friendly thermoplastics, the PHAs are considered as future polymers to replace petrochemicals ...
Asit Baran, Samui, Tapan, Kanai
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Hydrolytic degradation of blends of polyhydroxyalkanoates and functionalized polyhydroxyalkanoates
Polymer Degradation and Stability, 2004Abstract The hydrolytic degradation of poly(3-hydroxyalkanoates), PHA, blends with low and high molecular weight additives was examined. The PHA films were characterised by Differential Scanning Calorimetry, DSC, and Atomic Force Microscopy, AFM. The DSC and AFM results revealed that hydrolyzable PLA and hydrophilic PEG, selected as additives which ...
Estelle Renard +3 more
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Microbial Degradation of Polyhydroxyalkanoates
Annual Review of Microbiology, 2002▪ Abstract Polyesters such as poly(3-hydroxybutyrate) (PHB) or other polyhydroxyalkanoates (PHA) have attracted commercial and academic interest as new biodegradable materials. The ability to degrade PHA is widely distributed among bacteria and fungi and depends on the secretion of specific extracellular PHA depolymerases (e-PHA depolymerases), which ...
Dieter, Jendrossek, Rene, Handrick
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Polyhydroxyalkanoates, challenges and opportunities
Current Opinion in Biotechnology, 2014Microbial polyhydroxyalkanoates (PHA) have been developed as biodegradable plastics for the past many years. However, PHA still have only a very limited market. Because of the availability of large amount of shale gas, petroleum will not raise dramatically in price, this situation makes PHA less competitive compared with low cost petroleum based ...
Ying Wang, Jin Yin, Guo-Qiang Chen
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Biodegradation of polyhydroxyalkanoic acids
Applied Microbiology and Biotechnology, 1996Stimulated by the commercial availability of bacteriologically produced polyesters such as poly[(R)-3-hydroxybutyric acid], and encouraged by the discovery of new constituents of polyhydroxyalkanoic acids (PHA), a considerable body of knowledge on the metabolism of PHA in microorganisms has accumulated.
D, Jendrossek +2 more
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Polyhydroxyalkanoate-based Multiphase Materials
2014This chapter deals with polyhydroxyalkanoate (PHA)-based multiphase materials, their preparation, properties, and possible applications. After a brief introduction to the different PHAs and their main physical properties, their limitations and weaknesses are exposed and possible solutions arising from PHA-based multiphase systems are introduced.
Khandal, D, Pollet, Eric, Avérous, Luc
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Polyhydroxyalkanoates in Packaging
2019Synthetic plastics have been very well recognized for the packaging industry. An evident inclination towards development of biodegradable Bioplastics based on biological material and, particularly for bulk packaging applications has been perceived as a strategy to overcome the dependency of packaging sector on fossil fuels and diminish the biospheric ...
Neetu Israni, Srividya Shivakumar
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Polysaccharide und Polyhydroxyalkanoate
2013Polymere nehmen eine zentrale Rolle im Kohlenstoffkreislauf der Natur ein und werden in ungeheuer grosen Mengen synthetisiert. Es wird geschatzt, dass Pflanzen jahrlich z. B. ca. 50 bis 100 Gigatonnen Cellulose und in etwa die gleiche Menge Lignin produzieren. Bezogen auf die Masse ist dies ein Vielfaches der jahrlichen Erdolforderung (ca.
Alexander Steinbüchel, Matthias Raberg
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