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Opis: Novel composites between cellulose (CEL) and keratin (KER) from three different sources (wool, hair and chicken feather) were successfully synthesized in a simple one-step process in which butylmethylimidazolium chloride (BMIm+Cl-), an ionic liquid, was used as the sole solvent. The method is green and recyclable because [BMIm+Cl-] used was recovered for reuse. Spectroscopy (FTIR, XRD) and imaging (SEM) results confirm that CEL and KER remain chemically intact and homogeneously distributed in the composites. KER retains some of its secondary structure in the composites. Interestingly, the minor differences in the structure of KER in wool, hair and feather produced pronounced differences in the conformation of their corresponding composites with wool has the highest α-helix content and feather has the lowest content. These results correlate well with mechanical and antimicrobial properties of the composites. Specifically, adding CEL into KER substantially improves mechanical strength of [CEL+KER] composites made from all three different sources, wool, hair and chicken feathers (i.e., [CEL+wool], [CEL+hair] and [CEL+feather]. Since mechanical strength is due to CEL, and CEL has only random structure, [CEL+feather] has, expectedly, the strongest mechanical property because feather has the lowest content of α-helix. Conversely, [CEL+wool] composite has the weakest mechanical strength because wool has the highest α-helix content. All three composites exhibit antibacterial activity against methicillin resistant S. aureus (MRSA). The antibacterial property is due not to CEL but to the protein and strongly depends on the type of the keratin, namely, the bactericidal effect is strongest for feather and weakest for wool. These results together with our previous finding that [CEL+KER] composites can control release of drug such as ciprofloxacin clearly indicate that these composites can potentially be used as wound dressing.
Najdeno v: ključnih besedah
Ključne besede: Green synthesis, Ionic liquid, Keratin, Antibacteria, Wound dressing
Objavljeno: 08.06.2016; Ogledov: 3219; Prenosov: 0
Polno besedilo (4,41 MB)

Najdeno v: ključnih besedah
Povzetek najdenega: ...processing wastes, green extraction methods, polyphenols...
Ključne besede: processing wastes, green extraction methods, polyphenols
Objavljeno: 23.08.2019; Ogledov: 1965; Prenosov: 1
Polno besedilo (616,59 KB)
Gradivo ima več datotek! Več...

Opis: The Golden Horn (in Turkish Halic means Gulf or Altın Boynuz "Golden Horn") is a historic inlet of the Bosphorus dividing the city of İstanbul and forming the natural harbor that has sheltered Ottoman and other ships for thousands of years. It is a scimitar-shaped estuary that joins the Bosphorus just at the point where that strait enters the Sea of Marmara, thus forming a peninsula the tip of which is "Old İstanbul". This thesis work focuses on design proposal for the pedestrian bridge for Golden Horn Dis-trict, which links the royal and later historical peninsula to the rest of the city. The main challenge of the thesis is creation of continuous pedestrian network to guarantee uninter-rupted pedestrian connectivity as well as systematic activation of social and environmental urban regeneration.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Horn, historical penninsula, connection, transportation, cultural park, green areas, attraction points, İstanbul, Leonardo Da Vinci...
Ključne besede: bridge, pedestrianization, walkability, Golden Horn, historical penninsula, connection, transportation, cultural park, green areas, attraction points, İstanbul, Leonardo Da Vinci
Objavljeno: 28.02.2020; Ogledov: 1895; Prenosov: 71
Polno besedilo (20,12 MB)

Najdeno v: ključnih besedah
Povzetek najdenega: ...eu elections, tsipras, green, austerity, failure to unite, individualisation...
Ključne besede: eu elections, tsipras, green, austerity, failure to unite, individualisation
Objavljeno: 18.09.2020; Ogledov: 1047; Prenosov: 0