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Articles by Semih YILMAZ
Total Records ( 2 ) for Semih YILMAZ
  Ilyas Bozlagan , Abdurrahman Ayvaz , Fatma Ozturk , Leyla Acik , Mikail Akbulut and Semih Yilmaz
  Sixty Bacillus spp. isolates were obtained from different agricultural fields in Kayseri province using selective media. Total DNA was isolated and analyzed by PCR using cry1 general primers. Of the 60 tested isolates, 17 carried the cry1 gene. B. thuringiensis subsp. kurstaki and all other isolates exhibited approximately 19-kb plasmid bands. In addition to the 270-bp band, the standard strain and isolate I47 yielded 180-bp PCR products. The isolates and standard strain were toxic to Ephestia kuehniella Zeller and Plodia interpunctella Hubner larvae. Insecticidal activity of isolates I36, I37, and I40 against Ephestia kuehniella was higher than that of the standard strain when 106 spore-crystals mL-1 was used. LC99 values for isolates I36, I37, and I40 were 6.46, 6.28, and 6.24 for E. kuehniella, respectively, and these isolates were also effective against Plodia interpunctella larvae. LC99 values for isolates I36 and I40 were 6.69 and 5.07 for P. interpunctella, respectively. The results clearly show that isolates I36, I37, and I40 were effective at lower doses, as compared to the others.
  Ali Irfan ILBAS , Umut GONEN , Semih YILMAZ and Mehmet Yasar DADANDI
  Aloe vera L. is a valuable medicinal plant and is currently used in pharmaceutical, cosmetic, and food industries worldwide. In the present study, the eff ect of various concentrations of Aloe vera leaf gel extracts was investigated on mitotic and phase indexes of Allium cepa L. root tip cells for 24 and 48 h durations. Th e EC50 value of gel extracts was found to be 20% and was used to determine the experimental concentrations. Th e results indicated that the mitotic index and root growth rate of A. cepa were considerably decreased in comparison to the control. We found that the cytotoxic eff ect of A. vera gel extracts depends on the concentration rather than the exposure time. Even the low doses caused a considerable decrease in root growth rate. Th e lowest mitotic index value was found to be 3.72% at 40% gel extract treatment for 48 h duration. Average prophase index during 24 and 48 h applications was found to be 53.80% and 56.48%, respectively. We conclude that A. vera gel extracts have a cytotoxic eff ect on the root tip cells of A. cepa.
 
 
 
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