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- 검색키워드
- 저자 : Koci, M. (검색결과 5 건)
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Tomanović Željko,Kocić Korana,Čkrkić Jelisaveta,Petrović Andjeljko,van Achterberg Cornelis 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
The genera Aphidius Nees, 1818 and Toxares Haliday, 1840 both belong to the subfamily Aphidiinae, a group whose members are obligatory koinobiont endoparasitoids of aphids (Hemiptera, Aphididae). While Toxares is a small genus with only five known species from the Holarctic and Oriental regions, Aphidius is the most diverse within the subfamily with more than 130 recognised species distributed worldwide. Here we describe two new species discovered in the collection of Naturalis Biodiversity Center: Toxares fovealis sp.n. from Europe (the Netherlands) and Aphidius breviflagellaris sp.n. from Eastern Asia (South Korea). We also analyse genetic and morphological variability of Toxares deltiger (Haliday, 1833) specimens collected in Europe and redescribe the species.
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Biomechanical Testing of Spinal Segment Fixed by Arcofix System on the Swine Spine
Martin Kelbl,Jan Kocis,Radek Vesely,Zdenek Florian,Tomas Navrat,Petr Vosynek 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.4
Study Design: An in vitro biomechanical study. Purpose: To evaluate the mechanical properties of the spinal segment in the intact, injured, and stabilized state after fixation by an Arcofix implant. Overview of Literature: Several types of thoracolumbar spine injury necessitates anterior instrumentation. The Arcofix plate represents the latest generation of angular stablity systems. The biomechanical properties of these implants have not been sufficiently studied yet. Methods: A total of ten porcine specimens (levels Th12–L3) were prepared. The tests were performed for intact, injured, and implanted specimens. In each state, the specimen was subjected to a tension load of a prescribed force, and subsequently, twisted by a given angle. The force load was 200 N. The torsion load had a deformation character, i.e., the control variable was the twisting angle and the measured variable was the moment of a couple. The amplitude of the load alternating cycle was 3°. Another parameter that was evaluated was the area of the hysteresis loop. The area corresponds to the deformation energy which is dissipated during the cycle. Results: A statistically significant difference was found between the intact and injured states as well as between the injured and implanted specimens. The statistical evaluation also showed a statistically different value of the hysteresis loop area. In the case of instability, the area decreased to 33% of the physiological value. For the implanted sample, the area increased to 170% of the physiological value. Conclusions: The Arcofix implant with its parameters appears to be suitable and sufficiently stable for the treatment of the anterior column of the spine.
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Development and testing of multicomponent fuel cladding with enhanced accidental performance
Krejci, Jakub,Kabatova, Jitka,Manoch, Frantisek,Koci, Jan,Cvrcek, Ladislav,Malek, Jaroslav,Krum, Stanislav,Sutta, Pavel,Bublikova, Petra,Halodova, Patricie,Namburi, Hygreeva Kiran,Sevecek, Martin Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.3
Accident Tolerant Fuels have been widely studied since the Fukushima-Daiichi accident in 2011 as one of the options on how to further enhance the safety of nuclear power plants. Deposition of protective coatings on nuclear fuel claddings has been considered as a near-term concept that will reduce the high-temperature oxidation rate and enhance accidental tolerance of the cladding while providing additional benefits during normal operation and transients. This study focuses on experimental testing of Zr-based alloys coated with Cr-based coatings using Physical Vapour Deposition. The results of long-term corrosion tests, as well as tests simulating postulated accidents, are presented. Zr-1%Nb alloy used as nuclear fuel cladding serves as a substrate and Cr, CrN, Cr<sub>x</sub>N<sub>y</sub> layers are deposited by unbalanced magnetron sputtering and reactive magnetron sputtering. The deposition procedures are optimized in order to improve coating properties. Coated as well as reference uncoated samples were experimentally tested. The presented results include standard long-term corrosion tests at 360℃ in WWER water chemistry, burst (creep) tests and mainly single and double-sided high-temperature steam oxidation tests between 1000 and 1400℃ related to postulated Loss-of-coolant accident and Design extension conditions. Coated and reference samples were characterized pre- and post-testing using mechanical testing (microhardness, ring compression test), Thermal Evolved Gas Analysis analysis (hydrogen, oxygen concentration), optical microscopy, scanning electron microscopy (EDS, WDS, EBSD) and X-ray diffraction.
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Effect of Genotype on Whole-body and Intestinal Metabolic Response to Monensin in Mice
Fan, Y.K.,Croom, W.J.,Daniel, Linda,McBride, B.W.,Koci, M.,Havenstein, G.B.,Eisen, E.J. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.4
Two lines of mice, M16 selected for rapid growth and a randomly selected control ICR as well as their reciprocal crosses were used to study the effects of genotype on whole-body energetics and intestinal responses to monensin. Six mice, eight weeks of age, from each line or reciprocal cross were assigned to one of two treatments, 1) drinking water containing 20 mmol/L monensin dissolved in 0.5% V/V ethanol, and 2) drinking water containing 0.5% V/V ethanol (control) for two weeks. After 11 days (age of 9 weeks and 4 days), whole-body $O_2$ consumption was measured. At the end of two weeks, jejunal $O_2$ consumption, intestinal tissue composition and histomorphometrics as well as the rate and efficiency of glucose absorption were estimated. In comparison with the control, monensin administration in drinking water resulted in less daily water intake (13.4 vs. 15.5 ml/mouse, p<0.01), less protein to DNA ratio of jejunal mucosa (5.41 vs. 6.01 mg/mg, p<0.05), lower villus width (88 vs. $100{\mu}m$, p<0.05), and less jejunal tissue $O_2$ consumption enhancement by alcohol (7.2 vs. 10.5%, p<0.01) in mice. Other than those changes, monensin had little (p>0.05) effect on variables measured in either line of mice or their reciprocal cross. In contrast, the M16 line, selected for rapid growth, as compared to the ICR controls or the reciprocal crosses, had less initial (pre-monensin treatment) whole-body $O_2$ consumption per gram of body weight (1.68 vs. $2.11-2.34{\mu}mol/min{\cdot}g$ BW, p<0.01) as compared to the ICR and reciprocal crosses. In addition, the M16 mice exhibited greater growth (412 vs. 137-210 mg/d, p<0.05), better feed efficiency (41.7 vs. 19.9-29.3 mg gain/g feed, p<0.05), shorter small intestines adjusted for fasted body weight (1.00 vs. 1.22-1.44 cm/g FBW, p<0.05), wider villi (109 vs. $87-93{\mu}m$, p<0.05), more mature height of enterocytes (28.8 vs. $24.4-25.1{\mu}m$, p<0.05) and a lower rate (91 vs. $133-145{\eta}mol\;glucose/min{\cdot}g$ jejunum, p<0.05) and less energetic efficiency (95 vs. $59-72{\eta}mol$ ATP expended/${\eta}mol$ glucose uptake, p<0.05) of glucose absorption compared to the ICR line and the reciprocal cross. Monensin had little (p>0.05) effect on whole-body $O_2$ consumption and jejunal function, whilst selection for rapid growth resulted in an apparent down-regulation of intestinal function. These data suggest that genetic selection for increased growth does not result in concomitant changes in intestinal function. This asynchrony in the selection for production traits and intestinal function may hinder full phenotypic expression of genotypic growth potential.
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