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    An application on fish bones by chemical modification of histidine as amino acid
    (Adem Yavuz SÖNMEZ, 2015) Kizilkaya, Bayram; Ormanci, Hasan Basri; Oztekin, Alkan; Tan, Evren; Ucyol, Nail; Turker, Gulen; Tekinay, Ahmet Adem
    In this study, fish bones as a waste in fish processing was investigated whether they could be used as multi-functional materials by chemical modification. Histidine was used and modified on the surface of bone particle by esterification method. The reaction was carried out in water. The results showed that the surface modification of bone particles was performed successfully. Histidine bonded on the surface of bone was calculated as 110.83 µmol/g. The point of zero charge (PZC) of bone apatite (H) and modified bone (HA4) was investigated and determined as 7.25 and 6.98, respectively. SEM-EDX spectrums showed that nitrogen element of histidine on the surface of HA4 could be observed in EDS spectrum clearly. According to EDS spectrum analysis, nitrogen amount of HA4 which was formed to the one of histidine composition was detected as 16.2 %., nitrogen amount of Hand HA5 was detected as 8.037% and 8.565 %, respectively.
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    Öğe
    Effects of different feather colors in chub mackerel (Scomber japonicus Houttuyn, 1782) handline used at Gökçeada Region on fishing efficiency
    (Adem Yavuz SÖNMEZ, 2016) Akyasan, Emirhan; Oztekin, Alkan; Altinagac, Ugur; Ayaz, Adnan
    In this study, fishing efficiency was analyzed by using different colored feathers in chub mackerel fishing (Scomber japonicus Houttuyn 1782) at Gökçeada. Catching lengths of green, brown (grayed), pink, white and orange feathers were determined to be 33.7 cm, 34.2 cm, 33.6 cm, 34.7 cm and 35.9 cm, respectively. When the fishing efficiencies of different colored feathers used in the study were compared at the end of the study, brown (grayed) color was found to have caught 164 individuals, having a catching rate of 35%. Orange colored feather was found to have caught 95 individuals, having a catching rate of 21% while white colored feather was found to have caught 49 individuals, having a catching rate of 11%. Green colored feather was found to have caught 70 individuals, having a catching rate of 15% and pink colored feather was found to have caught 82 individuals, having a catching rate of 18%.