Behzat Oral Bitlisli

Sequential secretion of collagenolytic, elastolytic, and keratinolytic proteases in peptide-limited cultures of two Bacillus cereus strains isolated from wool

Aims:  To characterize the secretion of proteolytic activities against keratin, collagen and elastin in liquid cultures of Bacillus cereus IZ‐06b and IZ‐06r isolated from wool.

Collagen-based hydrogel films as drug-delivery devices with antimicrobial properties

Collagen (coll)-containing hydrogel films were prepared by mixing degraded collagen with monomers such as acrylamide (AAm), and 2-hydroxy ethylmethacrylate (HEMA) before the polymerization/cross-linking of composites as p(coll-co-AAm), and p(coll-co-HEMA), respectively. These materials were used as drug-delivery devices for potential wound dressing materials by loading and releasing of model drugs such as gallic acid (GA) and naproxen (NP). A linear release profile was obtained up to 32-h release from GA-loaded p(coll-co-AAm) interpenetrating polymeric networks films, and 36-h linear release profile of NP for p(coll-co-HEMA). Furthermore, metal nanoparticles such as Ag and Cu prepared within these hydrogel films offered antimicrobial characteristic against known common bacteria such as Escherichia coli, Bacillus subtilis, and Staphylococcus aureus.

Farklı Proses Aşamasındaki Derilerin Diferansiyel Taramalı Kalorimetre ile Termal Davranışlarının Belirlenmesi ve Analiz Koşullarının Değerlendirilmesi

Calismada farkli proses asamasindaki derilerin termal davranislari cesitli kosullar altinda diferansiyel taramali kalorimetre (DSC) ile incelenmis ve derilerin hidrotermal stabilitesinin DSC ile tespit edilebilirligi arastirilmistir. Bu amacla oncelikle ham deri, pikle, tabaklanmis ve mamul haldeki derilerin hidrotermal stabilitesi, buzulme sicakligi standart testi ile analiz edilerek belirlenmistir. Ardindan ayni deri ornekleri farkli kosullandirma parametreleri kullanilarak kuru ve yas formda DSC metodu ile analiz edilmistir. Elde edilen veriler; 24 saat kosullandirilmis ve basinca dayanikli kaplar icerisinde, sulu ortamda, 25-150 oC araliginda analiz edilen deri orneklerinin en iyi sonuclari verdigini gostermistir. Ayni zamanda mevcut kosullardaki DSC termogramlarindan elde edilen verilerin, derilerin standart metot ile elde edilen buzulme sicakligi (Ts) degerleri ile paralellik gosterdigi tespit edilmistir.

Sıcaklığa Duyarlı Derilerin Yaşlanma Davranışları

Termokromik boyalarin ve pigmentlerin haslik ozelliklerini artirmak deri endustrisine benzersiz ve iddiali tasarim olanaklari ile yenilikci bir yaklasim saglar. Bu nedenle, finisaj islem basamaginda bir capraz baglayici ve UV absorban esliginde kullanilan termokromik pigmentlerin (soguk ve dokunma aktiviteli) yaslanma davranislari incelenmistir. Termokromik derilerin renk degistirme ozellikleri sadece sicaklik ve sicaklik ile bagil nemin beraber etkisinin incelendigi hizlandirilmis yaslanma testlerinin oncesi ve sonrasinda spektrofotometrik olarak belirlenmistir. Sonuc olarak, termokromik deriler uzerine yaslanmanin anlamli bir etkisi tespit edilememistir. Fakat soguk aktiviteli derilerde kismi bir azalma belirlenmis ve bu solma UV absorban ve capraz baglayici kullanimi ile engellenmistir.

Sturgeon Skins A Valuable Resource for Luxury Leather Industry

STURGEON SKINS – A VALUABLE RESOURCE FOR LUXURY LEATHER INDUSTRY ABSTRACT. This research paper presents sturgeon skins as a valuable resource for the luxury leather industry. Although less known for their use in the field of leather garments, sturgeon skins show a distinct alternation between skin and bony shields that suggests the possibility of manufacturing fashion accessories in the current fashion trends. The difficulty of processing technologies results from the peculiar structure of the skin without scales, but rich in bony protrusions. The paper presents the main characteristics of sturgeon skin processing, physical-mechanical and chemical properties, as well as the possibility of manufacturing luxury accessories. Research suggests a superior utilization of a byproduct of the fish processing industry and brings original contributions to knowledge regarding the properties of sturgeon skins.