Cilt:29 Sayı:01 (2020)

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https://dspace.ankara.edu.tr/handle/20.500.12575/76572

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Browsing Cilt:29 Sayı:01 (2020) by Author "Biyoloji"

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    Bıofılm formatıon and control of facultatıve thermophıle brevıbacıllus Agrı D505B
    (Ankara Üniversitesi Fen Fakültesi, 2020) Cihan, Arzu Çöleri; Biyoloji; Fen Fakültesi
    Brevibacillus agri D505b is an aerobic, non-pathogenic, endospore-forming facultative thermophilic bacillus. Six abiotic surfaces (stainless steel, glass, polyvinyl chloride, polypropylene, polystyrene, and polycarbonate) were compared with viable cell enumerations. According to results, D505b cells could able to attach all these surfaces. Stainless steel (6.10 log CFU/cm2) was found to be the most effective surface for biofilm formation. Polycarbonate (6.03 log CFU/cm2) was found as the second best surface. Furthermore, the D505b biofilm was treated with 15 different sanitation agents and trichloroacetic acid (TCA) was determined to be the most effective one (80.3% removal). Our results showed that the strong biofilm producer B. agri D505b was very resistant to various sanitation agents. However, TCA significantly inhibited biofilm formation for the isolate.
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    Comparatıve bıometrıc and morphologıcal analysıs of subgenus terrıcola (rodentıa: mıcrotus) ın eastern black sea regıon from Turkey
    (Ankara Üniversitesi Fen Fakültesi, 2020) Çolak, Ercüment; Biyoloji; Fen Fakültesi
    In the scope of current study, 41 specimens of the subgenus Terricola collected from nine different localities in Trabzon, Rize and Artvin provinces in Eastern Black Sea Region were subjected to detailed morphological and comparative biometric analyses. Based on those analyses; presence of two species, Microtus (Terricola) subterraneus and Microtus (Terricola) majori were determined in the region. Evaluation of the 12 specimens belonging to M. (T.) subterraneus showed that there is no intrapopulational variation within this species. Two different populations of M. (T.) majori were determined in the region studied, based on morphological differentiations in enamel cusp patterns of 29 specimens. Additionally, as a result of the evaluations made, it was determined that both species could be found in the similar habitats throughout study area and therefore that these two species can be coexist as sympatric within the same geographic area.
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    Nematode-destroyıng fungı: ınfectıon structures, ınteractıon mechanısms and bıocontrol
    (Ankara Üniversitesi Fen Fakültesi, 2020) Karakaş, Mehmet; Biyoloji; Fen Fakültesi
    Fungi are pathogenic for different nematode groups, but their relationship with soil nematodes goes a grade beyond parasitism and into predation. Approximately, 200 species of taxonomically various fungi can attack active nematodes, which are effective animals nearly 0.1 to 1.0 mm long. Among these nematode-destroying fungi, only a few species are obligate parasites of nematodes; the majority are facultative saprotrophs. Nematode-destroying fungi have four general groups: (a) fungi with specialized structures (b) fungi with toxins; (c) fungi with spore germination; (d) fungi with colony-forming. Nematode-destroying fungi are natural enemies of nematodes in soil ecosystems and have potential as biocontrol agents against plant- and animal-parasitic nematodes. These predator fungi catches free-living nematodes in the soil ecosystem using traps produced by the fungal mycelium that cling to the worm, then, penetrate, kill, and digest the tissue of the nematode. Five kinds of trapping apparatus belonging to fungi are defined. These are adhesive or sticky column, adhesive or sticky knob, adhesive or sticky system, constricting and non-constricting rings.
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    Reassessment of ıucn threat category for local endemıc campanula damboldtıana from Ankara, Turkey
    (Ankara Üniversitesi Fen Fakültesi, 2020) Yaprak, Ahmet Emre; Biyoloji; Fen Fakültesi
    In this study, threat category of local endemic plant species Campanula damboldtiana was reassessed according to IUCN Red List Categories and Criteria. C. damboldtiana prefers special habitat type with marly-gypsaceous soils. The assessment based on new field data such as current population size, distribution areas and the main threats to this taxon. Field studies were carried out during the vegetation periods between 2017 and 2018. In addition to those parameters, soil samples were taken from each location and physical and chemical analyses were performed including pH, EC, gypsum, texture, CaCO3 parameters. Also, bioclimatic interpretations were made with the climatic data of the locations. With a recently discovered population, C. damboldtiana has three populations known from Ankara. The estimated total number of mature individuals was 8982. The area of occupancy and the extent of occurrence were calculated as 16 km2 and 16 km2, respectively. Considering our findings of C. damboldtiana, the IUCN threat category was reassessed as Critically Endangered (CR) as indicated in Red Data Book of Turkish Plants.