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    Reliability and evaluation of point load index values obtained from different testing devices
    (Southern African Inst Mining Metallurgy, 2020) Akbay, D.; Altindag, R.
    In some rock mass classification methods, the point load index (PLI) value is used as a parameter in the determination of the class of rock mass. The PLI value may be used as a design parameter such as uniaxial compressive strength (UCS) and tensile strength (TS), owing to its being simpler, faster, and cheaper and easier to prepare than the specimens for UCS and TS tests. It can also be carried out in both the field and the laboratory. Many researchers have investigated PLI testing and the effect of different loading configurations, sample size, and size correction factors. Within the scope of this study, PLI tests were performed in 15 different point load index testing devices. The experiments were carried out on seven different rock types (three sedimentary, one metamorphic, three magmatic) by the same operator. The errors of the testing devices were investigated based on the experimental results, and a device was modified to avoid the errors identified. Additional experiments were carried out in the modified testing device to acquire more realistic values. The PLI values obtained from the modified device were found to be more reliable, with standard deviations lower than those obtained from other conventional testing devices.
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    Species diversity, mating type assays and aggressiveness patterns of Monilinia pathogens causing brown rot of peach fruit in Turkey
    (Springer, 2020) Ozkilinc, H.; Yildiz, G.; Silan, E.; Arslan, K.; Guven, H.; Altinok, H. H.; Altindag, R.
    Brown rot disease caused by fungal species from theMoniliniagenus has recently been observed as one of the most important limiting factors for yield and quality of peach fruits in Turkey. During June and July of 2018, field trips to different peach orchards were performed in six provinces located in four different geographical regions of Turkey. One hundred and twenty-nine isolates were obtained from the diseased fruits, and of those, 109 were identified asMonilinia fructicola, whereas 20 wereM. laxaaccording to the species-specific molecular markers. Mating types of the isolates were detected by PCR assays using primers designed in this study. Each isolate represented only one of the mating type genes. Overall data sets presented 1:1 ratio of mating types for both species, indicating a possible sexual reproduction. No polymorphisms were detected in partial sequences of mating type genes. The isolates werein vitrotested for their pathogenicity using apple fruits as a host and aggressiveness were evaluated at different time points using lesion sizes.Monilinia laxawas found more aggressive thanM. fructicola. Moreover,M. fructicolaisolates displayed larger colony growth compared toM. laxaisolates. However, no significant correlation was detected between the colony growth rates and virulence. This study is the first to demonstrate brown rot pathogens of peach fruit in Turkey and identifies different aspects of the pathogens, which would be useful in containment of pathogen spread and comparison with other populations of these pathogens worldwide, and suggests a new set of mating type markers for these species.