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Results 1111 to 1140 of 1506:

Multifactor productivity analysis in the sample of agricultural enterprises

Jaroslav Svoboda, Martina Novotná

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(7), 395-402 | DOI: 10.11118/actaun201159070395

Utilization of an video camera in study of the goshawk (Accipiter gentilis) diet

Martin Tomešek, Lukáš Kratěna, Petr Čermák, Karel Tomešek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(1), 227-234 | DOI: 10.11118/actaun201159010227

Efficiency in the Czech banking industry: A non-parametric approach

Daniel Stavárek, Iveta Řepková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(2), 357-366 | DOI: 10.11118/actaun201260020357

Water quality and biotic community composition of a highland stream influenced by different human activities

Radovan Kopp, Radim Petrek, Ivo Sukop, Tomáš Brabec, Tomáš Vítek, Pavla Řezníčková, Andrea Ziková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(3), 83-92 | DOI: 10.11118/actaun201260030083

Methodological approaches to evaluation of disparities in regions of the Czech Republic

Jaroslav Jánský, Soňa Váleková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(4), 155-164 | DOI: 10.11118/actaun201260040155

Effect of biofuel E85 combustion on fuel consumption in spark-ignition engines

Adam Polcar, Marek Žák, Jiří Čupera, Pavel Sedlák

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(5), 173-180 | DOI: 10.11118/actaun201260050173

Changes of quality of rennets during storing

Monika Kozelková, Miroslav Jůzl, Táňa Lužová, Květoslava Šustová, Aneta Bubeníčková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(6), 189-196 | DOI: 10.11118/actaun201260060189

Economic results of agricultural enterprises in 2010

F. Střeleček, Daniel Kopta, Jana Lososová, Radek Zdeněk

Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(7), 315-328 | DOI: 10.11118/actaun201260070315

Knowledge, flawlessness and failures in processing of public procurement documents at the state administration

Nataša Pomazalová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(7), 275-282 | DOI: 10.11118/actaun201159070275

Tendencies of climatic extremes occurrence in different Moravian regions and landscape types

Bronislava Mužíková, Vítězslav Vlček, Tomáš Středa

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 169-178 | DOI: 10.11118/actaun201159050169

SITUAČNÍ ANALÝZA VNITŘNÍHO PROSTŘEDÍ PIVOVARU A SODOVKÁRNY JIHLAVA

Helena Chládková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 37-46 | DOI: 10.11118/actaun200856060037

Brewing is a very important part of the food industry with a successful tradition. Beer, brewer's malt and hops are important for export too. The situation in the beer market is changing dramatically at this time. Smaller local breweries are fighting with big competitors for the first time through expansion and innovation of the production line. Brewing development will be probably the same as in another European states, where are twenty big breweries to a thousand small ones. The strategy of Czech beer production is focused on the traditional production of classic Czech beer. For small breweries there are big opportunities in beer tourism, beer path building, brewery sight-seeing and brewery festivals for example.
This paper describes a particular firm's activities with using Porter's value chain and an analysis of its financial situation. In final part the Strength and Weakness analysis of the company Pivovar a sodovkárna Jihlava, a. s. is done and on the basis of the results are defined the appropriate advices.
During the recent period of time there have been many researchers from the FBE MUAF in Brno, who focused on the analysis of the food company's internal environment, e.g. Bečvářová (2005); Duda (2006, 2007); Jánský (2002, 2005); Syrovátka (2000); Veselská (2005); Zrůst and Pyšný (2007); Živělová a kol. (2004). The research on trade in food is solved firstly by Presová and Tvrdoň (2005).

Vliv pastvy ovcí na obsah energie a organických živin ve stepních porostech Národní přírodní rezervace Mohelenská hadcová step

Pavel Veselý

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 229-236 | DOI: 10.11118/actaun200856010229

The aim of this research was to assess the implications of sheep grazing for the nutritional value of the vegetation in the Mohelno Serpentine Steppe National Nature Reserve (NNR). A free pasture controlled by an electric fence was practised from 1997 to 1998. The German Merino sheep were grazing on an area of 4.25 and 6 ha with a pasture load of 6.8-9.4 sheep per 1 ha in 1997 and 6.7-8.7 sheep per 1 ha in 1998. The steppe vegetation samples were collected from five different sites reflecting the phytocenological composition typical of the individual steppe areas. The vegetation samples were collected on an area of 3×1 m2 during the growing season at two-week intervals. The collected samples were tested for the amount of dry matter, fibre, nitrogenous substances, fat, ash, nitrogen-free extractive substances (NFES), gross energy (GE), metabolic energy (ME), lactation net energy (LNE), fattening net energy (FNE), PDIN and PDIE (PDI - referring to the factually digestible nitrogenous substances in the small intestine of the ruminants). During pasture there was a decrease in the dry matter levels but its average levels remained high (35.45-46.78%). The effect on the nitrogenous levels became apparent (P < 0.05) mainly in the second year of grazing (10.00-10.94% compared to 11.64-19.35% in the vegetation dry matter). However, in comparison with the pasture vegetation the effect remained less significant. A similar situation was observed in relation to the fluctuation of PDIN and PDIE (64.60-70.71 compared to 75.18-124.98 g/kg of the dry matter and 79.03-82.71 compared to 89.41-29.27 g/kg of the dry matter respectively). The fat levels (3.80-4.02%) were not affected by the site (P < 0.05) but the specific utilization. The grazing brought about a marked increase in the fat levels (P < 0.001). The amount of the fibre during the first year was affected only in terms of its decreased site variability (29.60-31.31%). The conclusive evidence (P < 0.05) of the decrease did not appear until the second year of grazing (21.76-27.88%). In the course of the pasture the ash levels identified in the dry matter were fluctuating between 8.74-10.19% depending on the site conditions and the form of utilization. Considerably high levels (P < 0.05) were recorded on more intensely grazed areas. NFES levels in the step areas (45.16-47.26%) were steady both in terms of the site conditions and the form of utilization.
The energy levels did not reflect the site variability. The ME, LNE and FNE levels (9.39-9.79; 5.52-5.80 and 5.34-5.69 MJ per kg of the dry matter respectively) were affected by the form of utilization. During the pasture the site variability of the energy levels decreased. There was also a substantial increase in the amount of energy established in the dry matter, which rose to the levels usual for pasture vegetation.

Roční cyklus zoobentosu Lednických rybníků

Roman Heimlich, Ivo Sukop

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 285-292 | DOI: 10.11118/actaun200856020285

The ponds of Lednice are situated in the area "Lednicko-valtický areál", which is included in the World Heritage List of UNESCO.
The aim of this essay was monitoring of seasonal dynamic zoobenthos development in the ponds Lednické rybníky over the years 2006-2007 and performance of qualitative and quantitative analysis of taken samples. The research was realized on ponds Nesyt, Hlohovecký, Prostřední, Mlýnský and Zámecký. Samples of macrozoobenthos were taken in monthly intervals. Qualitative studies of samples have shown 112 taxa of bentic macroinvertebrates in the localities mentioned above, 17 taxa were determined for the first time. Total number of benthic macroinvertebrates taxa known in the locality Lednické rybníky rose to 316 taxa. The values of macrozoobenthos density and biomass ranged between 22-15 667 ind.m-2 and 0.05-40.2 g.m-2, respectively.
With respect to the fact that only few researches with a focus on quality of macrozoobenthos in ponds of Lednice were realized, this research could bring supplementary information about the situation of benthic macroinvertebrates in the studied localities in new conditions of fish farming.

Pokročilé metody numerických predikcí s využitím neuronových sítí

Michael Štencl, Jiří Šťastný

Acta Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(6), 297-304 | DOI: 10.11118/actaun200957060297

Current global market is driven by many factors, such as the information age, the time and amount of information distributed by many data channels it is practically impossible analyze all kinds of incoming information flows and transform them to data with classical methods. New requirements could be met by using other methods. Once trained on patterns artificial neural networks can be used for forecasting and they are able to work with extremely big data sets in reasonable time. The patterns used for learning process are samples of past data. This paper uses Radial Basis Functions neural network in comparison with Multi Layer Perceptron network with Back-propagation learning algorithm on prediction task. The task works with simplified numerical time series and includes forty observations with prediction for next five observations. The main topic of the article is the identification of the main differences between used neural networks architectures together with numerical forecasting. Detected differences then verify on practical comparative example.

Vliv microcystinu, toxinu sinic, na laboratorní hlodavce in vivo

Andrea Ziková, Radovan Kopp

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 263-274 | DOI: 10.11118/actaun200856050263

Cyanobacterial water blooms became a global problem/issue because beside a dramatic deterioration of water quality parameters they also produce cyanobacterial toxins being harmful for animals and humans. Cyanotoxins especially the most prominent one, microcystin-LR (MC-LR), are of major concern and they have been reported to cause even death of mammals following ingestion or ingurgitation due to hepatotoxic modes of action. The aim of the recent study is to summarize briefly the impacts of microcystin on laboratory rodents, mice and rats, being used as models for other mammals including human beings. Most experimental approaches used intraperitoneal rather than oral and intratracheal application of microcystins, especially MC-LR, being the most efficient way to induce adverse impacts on different target organs. However, no matter how the exposure of rodents was performed, microcystins induced severe harmful impacts on the different target organs, preferentially the liver, for instances hemorrhages and apoptosis in liver, liver tumours, adverse effects on gut, kidney, testis and epididymis including spermatogenesis, on lung, on serum parameters and on progeny. In addition to these histological findings, microcystin was found to affect specifically biochemical parameters of target organs such as enzymes e.g. GST, CAT, GR, GPX, SOD, AST, ALT, γ-GT, protein phosphatases, SDH, SoDH and LDH or stress proteins such as HSP-70 and further parameters such as hepatic sulfhydryl content, GSH depletion, total bilirubin, urea nitrogen, and creatinine. Gene array analyses revealed that microcystin affects genes related to actin organization, cell cycle, apoptosis, cellular redox potential, cell signalling, albumin metabolism, glucose homeostasis pathway and organic anion transport polypeptide system. In combination with a further proteomics approach the proteomic analyses indicate that liver apoptosis induced by microcystin can be induced by two pathways: the BID-BAX-BCL2 and the reactive oxygen species pathway. The reviewed data clearly show that microcystin, especially MC-LR is able to cause severe adverse impacts on laboratory rodents and therefore there is an emerging need for further research to cover the major concern about cyanobacterial water blooms affecting mammals including human beings.

Akumulace toxických kovů vodními makrofyty a možnost jejich využití ve fytoremediačních postupech

Michaela Hillermannová, Radovan Kopp, Ivo Sukop, Tomáš Vítek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 97-104 | DOI: 10.11118/actaun200856010097

The aim of the performed research was to obtain knowledge on the ability of aquatic plants naturally growing at a site to absorb trace metals contained in bottom sediments and surface water. Furthermore, we compared differences in the accumulation of trace metals by the individual groups of aquatic plants (submerged and emergent) and assessed a possible use of the individual plant species in phytoremediation techniques. Representative samples of water, sediments and aquatic macrophytes were taken from three anthropogenically loaded streams in six monitoring cycles in several collection profiles differing in the distance from a source of contamination. The samples were analysed for the total content of selected trace metals (As, Cd, Pb, Al, Hg, Zn, Fe, Mn, Cr, Ni and Cu). For comparison, one profile at an unloaded site was sampled as well. The obtained results were subjected to multivariate statistical analysis of data. Increased contents of Fe, Al, Mn, Cr and Zn were detected in sediments and plant biomass at loaded sites, namely 2-3× higher than at the comparing site. The contents of metals in surface water samples were altogether below the detection limit of the analytical method. When evaluating the individual plant species, we can state that the lowest contents of metals were detected in shore species (reed canary grass Phalaroides arundinacea, wood club-rush Scirpus silvaticus and red dock Rumex aquaticus); plant species growing in the very water current (water star-wort Callitriche sp. and flote-grass Glyceria fluitans) exhibited mean contents of metals. In species forming mats (Fontinalis antipyretica and Cladophora sp.), these contents were several times higher as compared to the previous species. The results of the performed research show that one of important factors, which influence the accumulation of trace metals in plants, is their ecological group (emergent - submerged) affiliation and the species classification within this group. Based on the evaluated data, we can recommend species of moss and algae that form mats eventually species growing in the very water flow for the future use in phytoremediation techniques.

Hodnocení variability tvarů slepičích vajec

Miroslav Havlíček, Šárka Nedomová, Jana Simeonovová, Libor Severa, Ivo Křivánek

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 69-74 | DOI: 10.11118/actaun200856050069

Although recently reported models for determining egg shape are highly accurate, certain complicated measurements or computations are to be performed. Thus relatively simple and attainable analysis methods of chicken egg shape variability were chosen and used for the purpose of presented research. Sample of 250 eggs of ISA BROWN strain was examined. Geometrical parameters were measured and calculated with following expression of their coefficient of variation - namely egg length 3.56 %, egg maximum width 2.84 %, shape index 3.80 %, surface area 5.08 %, and egg volume 7.23 %. The second method consisted in shape quantitative measuring by the score of the principal components of elliptic Fourier descriptors (EFDs). The first four principles components which could explain over 99 % of the egg shape variations were found to be very good measures of the monitored phenomenon. It was found that 87.41 % of the total shape variation can be accounted to length to width ratio. Usefulness and relevance of the shape index usage was confirmed.

Synanthedon mesiaeformis (Herrich-Schäffer) nově v České republice a ve Španělsku (Lepidoptera: Sesiidae)

Zdeněk Laštůvka, Aleš Laštůvka

Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 141-146 | DOI: 10.11118/actaun200856050141

Synanthedon mesiaeformis (Herrich-Schäffer, 1846) has been found in the Czech Republic and in Spain for the first time. The species was found in the south-easternmost part of the Czech Republic, near the town of Břeclav (faunistic quadrat 7267) in May 2008. The holes and pupae were found only in one, solitary growing group of trees about 20 years old. This finding place lies at a distance of more than 250 km from the localities in SW Hungary and about 550 km from the localities in eastern Poland. In June 2008, the species was found also in alders growing in the flat river alluvium on gravel sands between La Jonquera and Figueres in northern Catalonia. This locality is in a close contact with the finding places near Perpignan and Beziers in southern France. The diagnostic morphological characters and bionomics of this species are briefly summarized and figured. The history of its distribution research is recapitulated and the causes of its disjunct range are discussed as follows. The present disjunct range represents a residual of the former distribution over the warmer and moister postglacial period; landscape modifications and elimination of solitary alder trees as "weeds" from the 18th up to the mid-20th century in large areas of Europe; narrow and partly unknown habitat requirements and specific population ethology; an insufficient level of faunistic investigations in several parts of southern and eastern Europe.

Changes in isoflavones concentrations in cheese during processing and ripening

Ludmila Křížová, Aleš Veselý, Jiří Třináctý, Věra Schulzová, Anna Hurajová, Jana Hajšlová, Eva Kvasničková, Šárka Havlíková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(1), 153-162 | DOI: 10.11118/actaun201159010153

Comparison of time series forecasting with artificial neural network and statistical approach

Michael Štencl, Ondřej Popelka, Jiří Šťastný

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(2), 347-352 | DOI: 10.11118/actaun201159020347

Economic and regional consequences of direct payments under the current CAP philosophy

Věra Bečvářová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(4), 19-26 | DOI: 10.11118/actaun201159040019

The forage utilization of winter pea-cereal mixture in agriculture low-input system

Josef Hakl, Václav Brant, Kamila Mášková, Karel Neckář, Jan Pivec

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 47-52 | DOI: 10.11118/actaun201159050047

Usage of hydrocolloids in cereal technology

Ľubomír Mikuš, Ľubomír Valík, Ladislav Dodok

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 325-334 | DOI: 10.11118/actaun201159050325

Evaluation of the infiltration capacity of soil in a winter wheat stand during the growing season 2010

Tomáš Mašíček, František Toman, Martina Vičanová, Věra Hubačíková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(6), 225-234 | DOI: 10.11118/actaun201159060225

Selected aspects of GDP value and structure development in sub-Saharan Africa

Luboš Smutka, Karel Tomšík

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(7), 347-362 | DOI: 10.11118/actaun201159070347

VNÍMANIE KVALITY JEDLÝCH OLEJOV SPOTREBITEĽMI V SR

Ľudmila Nagyová, Patrik Rovný, Jana Stávková

Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58(6), 329-334 | DOI: 10.11118/actaun201058060329

The aim of the paper is to highlight the perception of the quality of edible oils and preferences of the Slovak consumers for the oil purchase as well as the factors that can affect the purchase of oil, respectively the consumer decision-making. In order to obtain primary data was used the method of questionnaire investigation. In the questionnaire research there were 664 respondents from all over Slovakia involved. The results of marketing research showed the different approaches to assessing the quality by Slovak consumers. Nearly 54% of respondents connect the food quality with health certificate, high-quality ingredients and freshness. Brand quality SK is known by 58% of respondents. The raw material from which is oil produced, oil clarity, thermal stability and color are features that respondents prefer when purchasing the edible oils. To know the content of essential fatty acids was interesting only for 7.44% of the respondents. Slovak consumers prefer sunflower, olive and rapeseed oil.

RYCHLOST VSAKU VODY DO PŮDY NA VYBRANÉ LOKALITĚ V ŽABČICÍCH V PRŮBĚHU VEGETAČNÍ SEZONY 2008

M. Vičanová, F. Toman, Bohdan Stejskal, T. Mašíček, J. Knotek, J. Kotovicová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58(5), 399-406 | DOI: 10.11118/actaun201058050399

Purpose of currently running research, which is part of research program Biological and technological aspects of sustainability of controlled ecosystems and their adaptability to climate change at Faculty of Agronomy, is mapping of progress in water infiltration on selected areas at Žabčice locality and to specify possibilities of a water accumulation and retention influence in a landscape.
During of the first year of measurement (2008), from April to November, has proceeded field measurement of soil infiltration ability at Žabčice locality. To get statistically conclusive results, measurement runs in three repetitions and data are subsequently averaged. Three sets of homocentric metal cylinders were used for the measurement. Measurement of infiltration has been preceded by an overflow. Empirical equations according to Kosťjak were used for evaluation of field measurement.
At the same time there were ensured intact soil samples for laboratory determination of soil physical properties using Kopecky cylinders at depths of 10, 20 and 30 cm, and for the calculation of selected hydro-physical parameters of soil. reduced volume weight, actual monture, porosity, aeration and other.
Graphical presentation presents process of speed infiltration and cumulative infiltration on selected area Niva IV. A. Non-homogeneity of measured values could be induced by several different factors.

VYTVÁŘENÍ SYNERGICKÉHO PODNIKÁNÍ K PODPOŘE INOVAČNÍCH AKTIVIT

Ondřej Žižlavský

Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58(3), 271-276 | DOI: 10.11118/actaun201058030271

Innovation conduce to getting competitive advantage and they increase efficiency and total company performance. They are generally deemed as a key development factor. They represent group of activities leading to successful production, absorption and using economical and social innovation. Well managed and successfully introduced innovation into the market represents the tool for the companies, by means of which they can reach competitive advantages, enabling their prosperity in the slump. The urgency of synergic entrepreneurship as a key support of innovation is point out on a base of primary research in South Moravian manufacturing companies. As it is mentioned in this paper, most of respondents are open to external cooperation in innovation activities. Furthermore, they admit that without this collaboration they will not be able to produce any innovative products. Suitable forms, which can be utilized in our companies, are carried out with the help of secondary research in the article as well. Their accomplishments and disabilities are compared in accordance with local and foreign experts' theories. What follows is a discussion about requirements of strategic partnership success and advantages in the area of innovation.

The development of income and income differentiation in the Czech Republic according to the EU SILC

Jana Přikrylová

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(2), 231-236 | DOI: 10.11118/actaun201159020231

Impact of a pyrethroid insecticide application on ground beetles (Coleoptera: Carabidae) in a winter rape stand

Martin Šlachta, J. Vokoun

Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(3), 179-184 | DOI: 10.11118/actaun201159030179

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