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H. Pretzsch, T. Hilmers, E. Uhl, K. Bielak, M. Bošeľa, M. del Río, L. Dobor, D. Forrester et al.

Recent studies show that several tree species are spreading to higher latitudes and elevations due to climate change. European beech, presently dominating from the colline to the subalpine vegetation belt, is already present in upper montane subalpine forests and has a high potential to further advance to higher elevations in European mountain forests, where the temperature is predicted to further increase in the near future. Although essential for adaptive silviculture, it remains unknown whether the upward shift of beech could be assisted when it is mixed with Norway spruce or silver fir compared with mono-specific stands, as the species interactions under such conditions are hardly known. In this study, we posed the general hypotheses that the growth depending on age of European beech in mountain forests was similar in mono-specific and mixed-species stands and remained stable over time and space in the last two centuries. The scrutiny of these hypotheses was based on increment coring of 1240 dominant beech trees in 45 plots in mono-specific stands of beech and in 46 mixed mountain forests. We found that (i) on average, mean tree diameter increased linearly with age. The age trend was linear in both forest types, but the slope of the age–growth relationship was higher in mono-specific than in mixed mountain forests. (ii) Beech growth in mono-specific stands was stronger reduced with increasing elevation than that in mixed-species stands. (iii) Beech growth in mono-specific stands was on average higher than beech growth in mixed stands. However, at elevations > 1200 m, growth of beech in mixed stands was higher than that in mono-specific stands. Differences in the growth patterns among elevation zones are less pronounced now than in the past, in both mono-specific and mixed stands. As the higher and longer persisting growth rates extend the flexibility of suitable ages or size for tree harvest and removal, the longer-lasting growth may be of special relevance for multi-aged silviculture concepts. On top of their function for structure and habitat improvement, the remaining old trees may grow more in mass and value than assumed so far.

H. Pretzsch, T. Hilmers, E. Uhl, K. Bielak, M. Bošeľa, M. del Río, L. Dobor, D. Forrester et al.

Recent studies show that several tree species are spreading to higher latitudes and elevations due to climate change. European beech, presently dominating from the colline to the subalpine vegetation belt, is already present in upper montane subalpine forests and has a high potential to further advance to higher elevations in European mountain forests, where the temperature is predicted to further increase in the near future. Although essential for adaptive silviculture, it remains unknown whether the upward shift of beech could be assisted when it is mixed with Norway spruce or silver fir compared with mono-specific stands, as the species interactions under such conditions are hardly known. In this study, we posed the general hypotheses that the growth depending on age of European beech in mountain forests was similar in mono-specific and mixed-species stands and remained stable over time and space in the last two centuries. The scrutiny of these hypotheses was based on increment coring of 1240 dominant beech trees in 45 plots in mono-specific stands of beech and in 46 mixed mountain forests. We found that (i) on average, mean tree diameter increased linearly with age. The age trend was linear in both forest types, but the slope of the age–growth relationship was higher in mono-specific than in mixed mountain forests. (ii) Beech growth in mono-specific stands was stronger reduced with increasing elevation than that in mixed-species stands. (iii) Beech growth in mono-specific stands was on average higher than beech growth in mixed stands. However, at elevations > 1200 m, growth of beech in mixed stands was higher than that in mono-specific stands. Differences in the growth patterns among elevation zones are less pronounced now than in the past, in both mono-specific and mixed stands. As the higher and longer persisting growth rates extend the flexibility of suitable ages or size for tree harvest and removal, the longer-lasting growth may be of special relevance for multi-aged silviculture concepts. On top of their function for structure and habitat improvement, the remaining old trees may grow more in mass and value than assumed so far.

Milenko Vojvodić, Slobodan Simovic, Darko Paspalj

The research included 116 subjects who have declared that they had participated in sports, sport activities and recreation. It is a targeted sample, competent to declare their views on questions of why they practice sports and sport activities and what are the reasons (causes) for young people to quit the sport which they participated in. The results obtained on reasons for participation in sports and sport activities show that good physical shape is the primary reason, followed by health, social interaction, and friendship and making acquaintances, while a sporting career and financial benefit are by far lowest on the scale. When it comes to reasons why young people quit sports and sport activities, the majority quit because of indolence, followed by injuries, social circles, and lack of free time, pressure from overambitious parents, poor attitude of the coach, excessive exertion, and ultimately, lack of talent. When it comes to differences between attitudes on quitting sports between the sexes, occupations, smokers/non-smokers, alcohol consumers/non-consumers, and types of residential areas, the results have shown that neither the subject’s sex nor alcohol consumption have an impact on attitudes on reasons for quitting sports. Some difference was observed in level of education (high school or university student), smoking (smokers or non-smokers), and type of residential area (city, suburbs, countryside).

Luteolin and delphinidin are the flavonoids with known protective roles. They inhibit genotoxic effects induced by halogenated boroxine (HB) in vitro. Statistically significant decrease in the frequency of micronuclei and nuclear buds and suppression of the occurrence of aberrant cells were observed before, but mechanism of its anti-genotoxic activity is still not clear. In our experiment we aimed to quantify HB effects on the relative expression of CAT (catalase) gene and explore antioxidative effects of luteolin and delphinidin via restoration of CAT gene activity. Cell cultures from peripheral blood lymphocytes of five healthy donors were established and treated with independent and concomitant treatments of HB with luteolin or delphinidin. Total RNA was isolated from harvested cells and reverse-transcribed. SYBR based Real-Time PCR amplification method was used. Analysis of results included normalization of ratio of target (CAT) and housekeeping (GAPDH) gene and statistical analysis (REST®). Luteolin itself lead to downregulation of relative CAT gene expression as well as HB. But simultaneous treatment of HB and bioflavonoids lead to upregulation. Delphinidin as independent treatment and as simultaneous treatment caused upregulation of relative CAT gene expression. Obtained results may indicate protective role of delphinidin and luteolin to oxidative damage caused by HB, and also that new approaches to the treatment applications of HB should include bioflavonoids and monitoring corresponding antioxidant system. Our findings indicate that there is a quantifiable effect of luteolin and delphinidine on antioxidant genes which could be used in exact monitoring of oxidative stress related events.

L. Turulja, Merima Činjarević, Ljiljana Veselinović

Purpose The present study aims to explore “what” type of knowledge is shared, “how” it is shared and what information and communication tools are used to share knowledge among health-care professionals in the context of emerging “digital laggard” country in the South-Eastern European region (i.e. Bosnia and Herzegovina [B&H]). Design/methodology/approach This study applies the qualitative research methodology and thematic analysis for collecting, analysing and interpreting data. Primary data is collected using semi-structured interviews (n = 9). Key informants are employees of the main primary health-care institution in the capital of B&H. Findings The results indicate that knowledge sharing among primary health-care practitioners is the interplay of formal and informal exchange of knowledge, facilitated by both traditional communication media (face-to-face interaction) and ICT-based tools. In regards to ICT tools, our findings suggest that instant messing applications (predominantly Viber) are viewed as common media for sharing tacit knowledge within a community of practice. Research limitations/implications This study is limited to one emerging digital laggard country; thus, future research regarding ICT-based knowledge sharing in other emerging digital laggard countries is welcomed. Originality/value In the context of “digital laggard”, societies, informal, spontaneous and dynamic system of social interactions can be a successful substitute for ICT-based formalised and structured system of knowledge sharing.

G. Ali, H. A. M. A. El-Hady, M. Zeid

Streptococcosis causes economic losses due to the high mortality in Nile tilapia (Oreochromis niloticus). The present study was carried out to detect the streptococci by PCR and chemical analysis in cultured tilapia fish. A total of 100 cultured tilapia fishes and 20 water samples were collected from 4 different fish farms at different locations in Kafr El-sheikh Governorate for bacteriological and chemical analysis. The results of water quality parameters examination revealed that the mean values of pH, dissolved oxygen, unionized ammonia, and nitrite were 8.2 ± 0.73, 7.44 ± 0.54 parts per million (ppm), 0.05 ± 0.008 ppm, and 0.00 ppm, respectively. All water quality parameters except for ammonia were within the permissible limit. The bacterial isolation results revealed 38 % positive samples for Streptococcus species isolated from tilapia fishes and 40 % were positive for Streptococcus species isolated from water samples. Of those 38 positive fish samples, 25 (65.78%) were Enterococcus faecalis, 15 (39.47%) were Streptococcus pyogenes, 6 (15.78%) were Enterococcus faecium, 5 (13.15 %) were Streptococcus agalactiae, and 3 (7.89 %) were Streptococcus iniae. On the other hand, from 8 positive farms water samples, 7 (87.5%) were Enterococcus faecalis, 2 (25%) were Streptococcus pyogenes , 2 (25%) were Enterococcus faecium, 3 (37.5%) were Streptococcus agalactiae, and 1 (12.5%) was Streptococcus iniae . Using mPCR to identify Streptococcus for some fish and water isolates, 6 Enterococcus faecalis with 310 base per (bp) were detected while 3 Streptococcus agalactiae with 153 bp and 2 Enterococcus faecium at 215 bp were detected. However, the mPCR from Streptococcus species directly from organs from fish and water samples revealed that 5 Enterococcus faecalis were detected at 310 bp while 2 Streptococcus agalactiae was identified at 153 bp. The biochemical results indicated that the infected fish with the streptococcal species had reduced total protein, albumin, and globulin in the blood serum while total cholesterol, urea, creatinine levels, and AST, ALT, GPX, CAT, SOD activities significantly increased, compared to noninfected fish. O R IG IN A L A R T IC L E p i: S 2 3 2 2 4 5 6 8 2 0 0 0 0 3 7 -1 0 R eeiv ed : 1 1 Ju l 2 0 2 0 A ccep ed : 2 0 A u g 2 0 2 0

Alvin Huseinović, S. Mrdović, K. Bicakci, S. Uludag

The scope, scale, and intensity of real, as well as potential attacks, on the Smart Grid have been increasing and thus gaining more attention. An important component of Smart Grid cybersecurity efforts addresses the availability and access to the power and related information and communications infrastructures. We overload the term, Denial-of-Service (DoS), to refer to these attacks in the Smart Grid. In this paper, we provide a holistic and methodical presentation of the DoS attack taxonomies as well as a survey of potential solution techniques to help draw a more concerted and coordinated research into this area, lack of which may have profound consequences. To the best of our knowledge, the literature does not have such a comprehensive survey study of the DoS attacks and solutions for the Smart Grid.

Distributed and collaborative computer-aided design (CAD) environments include building information modeling (BIM) and geographical information systems (GISs) in civil engineering and architecture, or product data management/ product life cycle management (PDM/PLM) in mechanical engineering. It is essential to keep the data integrity in these computer applications as it contributes to building users’ confidence in CAD/BIM/PDM data. Blockchain technology, the core founda-tion of cryptocurrencies, is increasingly being used for other purposes and could solve the data integrity issue in collaborative CAD environments. However, it has some disadvantages such as the transparency of data and the slowness of storing data in the blockchain due to distributed consensus. Increasing demand by the Industry 4.0, IoT, Smart Cities, and other initiatives could foster the best what blockchain has to offer: data integrity, reliability, and traceability. This chapter explains how blockchain works, how can it be utilized in distributed CAD environments, what are the major challenges for implementation, and how CAD vendors could use it to increase CAD data integrity.

J. Fuentes-Martín, G. Isidori, M. König, Nudžeim Selimović

Extending previous work on this subject, we evaluate the impact of vector-like fermions at next-to-leading order accuracy in models with a massive vector leptoquark embedded in the $SU(4)\times SU(3)^\prime\times SU(2)_L\times U(1)_X$ gauge group. Vector-like fermions induce new sources of flavor symmetry breaking, resulting in tree-level flavor-changing couplings for the leptoquark not present in the minimal version of the model. These, in turn, lead to a series of non-vanishing flavor-changing neutral-current amplitudes at the loop level. We systematically analyze these effects in semileptonic, dipole and $\Delta F=2$ operators. The impact of these corrections in $b\to s\nu\nu$ and $b\to c\tau\nu$ observables are discussed in detail. In particular, we show that, in the parameter region providing a good fit to the $B$-physics anomalies, the model predicts a $10\%$ to $50\%$ enhancement of $\mathcal{B}(B\to K^{(*)}\nu\nu)$.

UDK 821.163.4(497.6).09:398  929 Hadžijahic M. Muhamed Hadžijahic znacajan naucni doprinos dao je na sistematiziranju, valoriziranju i kritickom vrednovanju bosnjacke i bosanskohercegovacke proslosti u cjelini. Posebno se interesirao za srednjovjekovnu i osmansku proslost Bosne, ali znacajan doprinos dao je i na polju proucavanja drugih perioda i aspekata bosnjacke proslosti i kulture. U ovom radu usredsredili smo se najprije na Hadžijahicev doprinos proucavanju usmene književne tradicije Bosnjaka, a potom i na afirmaciju odnosa Bosne, “bogumilstva“, bosanskog jezika i bosancice. Summary:  Muhamed Hadžijahic made a significant academic contribution to systematisation, valorisation and critical evaluation of Bosniaks past in particular as well as of Bosnian and Herzegovinian past as a whole. He was particularly interested in Medieval and the Ottoman history of Bosnia, but he also made a significant contribution to the study of other periods and aspects of Bosniaks’ history and culture. This article focuses primarily upon Hadžijahic’s contribution to the study of Bosniaks’ oral literature tradition and then secondly upon his endeavour in affirmation of relations of Bosnia, Bogumilism, Bosnian language and Bosancica.

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