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Ivan Cuk Dragan Mirkov Aleksandar Nedeljkovic Milos Kukolj Dusan Ugarkovic 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):207-219
The present study explored the method of testing muscle mechanical properties through the linear force–velocity (F–V) relationships obtained from loaded vertical jumps. Specifically, we hypothesised that the F–V relationship parameters depicting the force, power, and velocity of the tested muscles will differ among individuals of different physical fitness. Strength trained, physically active, and sedentary male participants (N = 10 + 10 + 10; age 20–29 years) were tested on maximum countermovement and squat jumps where manipulation of external loads provided a range of F and V data. The observed F–V relationships of the tested leg muscles were approximately linear and mainly strong (median correlation coefficients ranged from 0.77 to 0.92; all p < 0.05), independently of either the tested group or the jump type. The maximum power revealed higher values in the strength trained than in the physically active and sedentary participants. This difference originated from the differences in F-intercepts, rather than from the V-intercepts. We conclude that the observed parameters could be sensitive enough to detect the differences among both the individuals of different physical fitness and various jump types. The present findings support using loaded vertical jumps and, possibly, other maximum performance multi-joint movements for the assessment of mechanical properties of active muscles. 相似文献
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Dusan Kanazir 《Higher Education in Europe》1995,20(4):195-196
In order for developing countries, particularly the former socialist countries undergoing transition, to make progress in science, they must co‐operate among themselves. One way to stimulate such co‐operation is to create a network of eastern European Academies. Such a network would share information, facilities, and equipment; sponsor and direct work on joint projects of value to the sub‐region as a whole; and serve as a bulwark against brain drain. Such a network should be of interest to UNESCO and to other intergovernmental organizations. 相似文献
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Gordana Bjelakovic Petar Miladinovic Tatjana Jevtovic-Stoimenov Ivana Stojanovic Jelenka Nikolic Dusica Pavlovic Gordana Kocic Marija Bjelakovic Mira Ilic Dusan Sokolovic Jelena Basic 《Indian journal of clinical biochemistry : IJCB》2015,30(1):84-88
Arginase activity is important in polyamines and nitric oxide production which are required for the normal growth of placenta and embryo. A considerable arginase activity is observed in amniotic fluid in women at the end of pregnancy. Lecithin to sphingomyelin (L/S) ratio is widely used in order to assess fetal lung immaturity and prevention of neonatal respiratory distress syndrome, the major cause of neonatal morbidity and mortality. The purpose of our study was to determine if there is a relationship between arginase activity and L/S ratio in amniotic fluid. The study included 170 pregnant women, 18–43 years old, with normal and pathological pregnancy. The arginase activity was measured on the basis of the determination of the amount of liberated ornithine from arginine as substrate. The L/S ratio was done by using a thin layer chromatography. Increased level of arginase activity correlates with the fetal lung maturity. Arginase activity and L/S values may be useful biochemical data, for intrauterine baby maturity. 相似文献
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Dusan Savicevic 《International Journal of Lifelong Education》2013,32(4):361-378
Historical and comparative research shows that the roots of andragogy are deeper than certain contemporary authors mean. The learning and education of adults have always been integral parts of human activity and of human aspirations to learn. Theoretical discourses on pedagogy vs andragogy were common during the second half of the twentieth century in the former Yugoslavia. Two schools of thought were formed: pedagogical and andragogical. The first considered pedagogy as an ‘integral’ science of upbringing; the second one considered andragogy to be a relatively independent science dealing with distinctions of learning and education of adults. There were interesting discussions on andragogy in other countries. The greatest numbers of supporters of the concept of andragogy as a social scientific discipline (or under another name) come from Central and Eastern Europe and from the USA. 相似文献
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Stanislava Petrovic Natasa Bogavac-Stanojevic Jelena Kotur-Stevuljevic Amira Peco-Antic Ivana Ivanisevic Jasmina Ivanisevic Dusan Paripovic Zorana Jelic-Ivanovic 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2014,24(2):266-272
Introduction:
Urinary tract infection (UTI) is one of the most common bacterial infectious diseases in children. The aim of this study was to determine the total prooxidant and antioxidant capacity of children with UTI, as well as changes of oxidative status parameters according to acute inflammation persistence and acute kidney injury (AKI) development.Materials and methods:
The patients enrolled in the study comprised 50 Caucasian children (median age was 6 months) with UTI. Total oxidant status (TOS), total antioxidant status (TAS), oxidative stress index (OSI), inflammation marker C-reactive protein (CRP) and renal function parameters urea and creatinine were analyzed in patient’s serums.Results:
According to duration of inflammation during UTI, TAS values were significantly higher (0.99 vs. 0.58 mmol/L, P = 0.017) and OSI values were significantly lower (0.032 vs. 0.041 AU, P = 0.037) in the subjects with longer duration of inflammation than in the subjects with shorter duration of inflammation. We did not find significant difference in basal values of oxidative status parameters according to AKI development.Conclusions:
OSI values could detect the simultaneous change of TAS and TOS due to change in the oxidative-antioxidant balance during the recovery of children with UTI. TAS and OSI as markers of oxidative stress during UTI are sensitive to accompanying inflammatory condition. Further investigations are needed to evaluate whether TAS, TOS and OSI could be used to monitor disease severity in children with UTI. 相似文献7.
How do secondary school science teachers justify the model of a particulate nature of matter, and how do the arguments they use relate to historical arguments? To find out, we individually interviewed 11 in‐service secondary school science teachers (certified to teach chemistry and/or physics in secondary school, and with 2 to 30 years of teaching experience) regarding their arguments for the particulate nature of matter and experiments that could demonstrate the existence of particles. The collected data were qualitatively analyzed. Three qualitatively different categories of arguments could be constructed from data: philosophical arguments, indirect experimental arguments, and direct experimental arguments. The indirect experimental arguments which is the largest category could be further divided into qualitatively different subcategories: nonspecific research and experiments, and chemical, physical, and subatomic experiments. Even though several experiments and arguments were suggested by the informants in our study, the arguments regarding the validity of the experiments were quite uncertain and vague. The experiments and arguments were used to corroborate the particulate nature of matter and taken for granted in advance rather than used to justify a model with particles. The outcome was discussed in relation to scientific arguments and experiments and in view of results from previous science education research. Based on our data, teacher education and in‐service teacher training, as well as teacher guides, were suggested to be more elaborate regarding contemporary knowledge, with direct experimental evidence for the particulate nature of matter being presented. 相似文献
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