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Results 4531 to 4560 of 5716:

Rumen fermentation characteristics in pre-weaning calves receiving yeast culture supplements

B. Hučko, V.A. Bampidis, A. Kodeš, V. Christodoulou, Z. Mudřik, K. Poláková, V. Plachý

Czech J. Anim. Sci., 2009, 54(10):435-442 | DOI: 10.17221/1674-CJAS

In an experiment with 45 neonatal male Holstein calves, effects of yeast cultures Yea-Sacc® 1026 (SC) containing Saccharomyces cerevisiae (strain 1026) and Vitex (KF) containing Kluyveromyces fragilis (strain Jürgensen) on rumen fermentation characteristics were determined. From day 4 to day 56 of age, the calves were allocated to one of the three dietary treatments (Control, SC, and KF) of 15 animals each, placed in individual pens, and fed 4 l of whole milk twice daily and a basal concentrate mixture ad libitum as calf starter feeds. The control treatment was not supplemented with yeast culture. The yeast culture supplements Yea-Sacc® 1026 and Vitex were top-dressed at 10 g/calf daily on the basal concentrate mixture of treatments SC and KF, respectively. At the end of the experiment (day 56), all calves were slaughtered and the rumen fluid was analysed. The administration of yeast cultures Yea-Sacc®026 and Vitex to calves did not affect final body weight (BW), BW gain, dry matter intake, feed conversion ratio, ruminal pH, lactic acid concentration and the molar proportion of propionic acid, but it decreased (P < 0.05) the total volatile fatty acid concentration and the molar proportion of butyric acid, and increased (P < 0.05) the molar proportion of acetic acid and the acetate to propionate ratio. In addition, the microbial cellulolytic activity was higher in calves that received both yeast cultures compared to the control treatment. The results of this study suggest that the ruminal fermentation was more stable in calves receiving yeast culture supplements.

Complementary currency systems as a source of endogenous development of localities

L. Zagata

Agric. Econ. - Czech, 2004, 50(10):477-484 | DOI: 10.17221/5236-AGRICECON

The paper tackles the issue of regional and social development. From a sociological point of view, it focuses on the phenomenon of complementary currency systems. The analysis shows that money, as a social institution, has got certain features, which have an impact on economic behavior of people. Establishing a currency on the local level, which would circulate as a complement of the national currency, brings certain social benefits to local society. Nowadays, there are many complementary currency systems all over the world, including Europe. The paper attempts to answer the question, how they can contribute to the local development.

Determination of Fox grape genotypes (Vitis labrusca L.) grown in Northeastern Anatolia

H. Celik, B. Kose, R. Cangi

Hort. Sci. (Prague), 2008, 35(4):162-170 | DOI: 10.17221/655-HORTSCI

Northeastern part of Anatolia is a gene center of grapevine and a wide diversity of Fox grapes grow here. Viticulture and some grapevines in the Black Sea Region (in the north of Turkey) are on the verge of extinction; several types and varieties grown in this region have never been described and did not survive till present. For the past 10 years vineyards and grapevines in the Black Sea Region have been studied. In the present study, eighteen grapevines of foxy taste grown in the Artvin and Rize provinces were described. An ampelographic description of young shoot, mature shoot, young leaf, mature leaf, berry, bunch and seed were carried out using the OIV (Office International de la Vigne et du Vin) list for grapevine cultivars and Vitis species. However, several other parameters of the cultivars were measured for evaluation.

Game browse and its impact on selected grain crops

R. Cerkal, K. Vejražka, J. Kamler, J. Dvořák

Plant Soil Environ., 2009, 55(5):181-186 | DOI: 10.17221/381-PSE

This work presents the results of a survey that studied simulated plant browsing by herbivores. In 2004-2006, winter wheat, spring barley, and maize field trials were founded in order to monitor the impact of different levels of defoliation (leaf area reduction) on the yield and grain quality. The defoliation was carried out by means of mechanical removal of plant parts in the early growth stages. Selected qualitative parameters were determined in the harvested grain of wheat and barley. Statistically significant influence of leaf area reduction (LAR) on grain yield (decrease by 4-14%) was found only in maize in 2004. No statistically significant influence of the leaf area reduction on thousand grain weight (TGW) was found in any of the studied crops. The leaf area reduction in barley did not affect grain characteristics; however, it had a statistically significant influence on the quality of wheat grain. Moreover, wheat reduction statistically significantly increased the falling number (by 29-39 s) and decreased SDS test values (by 8-9 ml).

Impacts of root sulfate deprivation on growth and elements concentration of globe amaranth (Gomphrena globosa L.) under hydroponic condition

M.Y. Wang, L.H. Wu, J. Zhang

Plant Soil Environ., 2009, 55(11):484-493 | DOI: 10.17221/70/2009-PSE

Sulfur (S) regarded as the fourth key element is mainly taken by the plant roots. However, some plants can also absorb atmospheric sulfides, which may be of great importance for ameliorating the environment and for farming as a green organic S fertilizer used to balance insufficient soil S content for intensive cultivation in China; H2S and mainly SO2 are emitted to air as a result of the rapid industrialized and economic development. Globe amaranth (Gomphrena globosa L.) might be one of the plants that can use atmospheric sulfides for its growth. Therefore the effects of sulfate deprivation from root on its growth, S status and other elements concentration under hydroponic culture were explored firstly. Based on measurements of plant growth, biomass, nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), S, iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), boron (B), and molybdenum (Mo) concentration, the results showed that S concentration in flower, shoot and root of plant without root sulfate supplied was increased with plant growth and development, symptoms of S deficiency disappeared and other elements concentration in plant tended to be nearly the same as the root sulfate-supplied plants. The interesting results might imply that globe amaranth may be able to live on the atmospheric sulfides as sulfur source.

Energy and the European Union

V. Jeníček, V. Krepl

Agric. Econ. - Czech, 2009, 55(1):1-11 | DOI: 10.17221/2501-AGRICECON

There exists no energy policy in the European Union, but rather a whole series of long-term goals setting its strategic orientation. Until 2000, when the Green Book named "Towards the European Strategy of Energy Supplies Securing" was accepted, no real debate on the strategy of energy was held in the EU. The Green Book represents a key document of the European energy policy and it originated as a consequence of the fears of the European Committee regarding the growing energy dependence on the energy resources imports, from the politically not stable parts of the world. Among the three key points of the energy strategy, there belong stable supply of energy, acceptable energy prices and environment protection. With regard to the deepening European integration and interconnection of the individual member states economies, the decisions of one country also have an energy impact on the other states. Therefore, the cooperation among the individual members is necessary.

Combination of linear and weighted goal programming with penalty function in optimisation of a daily dairy cow ration

J. Žgajnar, L. Juvančič, S. Kavčič

Agric. Econ. - Czech, 2009, 55(10):492-500 | DOI: 10.17221/2601-AGRICECON

The aim of the paper is to present a developed spreadsheet tool for the formulation of a daily dairy cow ration. It is constructed on the basis of two linked sub-models developed on the MS Excel platform. It merges the common linear programming model and the weighted-goal programming model with a penalty function. The first sub-model is included in the tool to make an estimate of the least-cost magnitude that might be expected. The obtained result is entered into the second sub-model as the goal that should be met as closely as possible. The tool was tested at two different values of preferential weights for dairy cows with a 25 kg daily milk yield. The results obtained confirm the benefits of the applied approach. In contrast to the common linear program tools, which terminate at formulation of the least-cost ration, our tool provides more efficient rations (in both economic and nutritive terms) by fine-tuning the nutritive goals and by allowing for harmless deviations from these goals by application of penalty functions.

Dissolved organic carbon concentrations under conditions of different forestcomposition

M. Remeš, J. Kulhavý

J. For. Sci., 2009, 55(5):201-207 | DOI: 10.17221/16/2009-JFS

The study deals with the monitoring of dissolved organic carbon (DOC) concentrations in seepage water sampled from differently managed forest plots in the Drahanská vrchovina Upland. Simultaneously, the input of DOC in precipitation and throughfall is evaluated. Preliminary results show higher mobility level of carbon substances in forest soil in a pure spruce stand compared to mixed stand or a pure beech stand. DOC can be one of suitable characteristics to evaluate the conversion effectiveness of spruce monocultures.

Quantity and distribution of fine root biomass in the intermediate stage of beech virgin forest Badínsky prales

P. Jaloviar, L. Bakošová, S. Kucbel, J. Vencurik

J. For. Sci., 2009, 55(11):502-510 | DOI: 10.17221/31/2009-JFS

The fine root biomass represents 3,372 kg/ha in the intermediate stage of the beech virgin forest with different admixture of goat willow, where the vast majority of this biomass is located in the uppermost mineral soil layer 0-10 cm. The variability of the fine root biomass calculated from 35 sample points represents approximately 90% of the mean value and reaches the highest value within the humus layer. The total fine root length investigated in 10 cm thick soil layers decreases with increasing soil depth. A significant linear relationship between the fine root length (calculated per 1 cm thick soil layer and 1 m2 of stand area) and the soil depth was confirmed, although the correlation is rather weak. The number of root tips decreases with increasing soil depth faster than the root length. As the number of tips per 1 cm of root length remains in the finest diameter class without significant changes, the reason is above all a decreased proportion of the finest root class (diameter up to 0.5 mm) from the total fine root length within the particular soil layer.

The Effect of Fertilisation Method on Selected Elements Content in Tomatoes (Lycopersicon lycopersicum)

I. Poustková, L. Kouřimská, K. Václavíková, D. Miholová, L. Babička

Czech J. Food Sci., 2009, 27(10):S394-S396 | DOI: 10.17221/599-CJFS

Fermented pig slurry was used for two kinds of tomatoes fertilisation as a replacement of industrial mineral fertilisers in three-year experiment and selected elements (Pb, Cd, As, Zn and Hg) content were monitored by the AAS method. The results obtained showed that anaerobically fermented pig slurry can be a suitable alternative to mineral fertiliser use. Its use as an organic fertiliser also did not decrease the hygienic quality and safety of the grown vegetable products, and all tomato samples fulfilled the heavy metals legislation limits for Pb, Cd, As, Zn and Hg content. Statistically significant (P < 0.05) influences of the year, cultivar and fertilisation method were found in case of zinc content. No statistically significant differences in case of arsenic were discovered. Statistically significant influence (P < 0.05) of the year was found in case of cadmium and mercury contents.

Soluble and insoluble pollutants in fog and rime water samples

Jaroslav FIŠÁK, Valeria STOYANOVA, Pavel CHALOUPECKÝ, Daniela ŘEZÁČOVÁ, Tsenka TSACHEVA, Temenujka KUPENOVA, Miko MARINOV

Soil & Water Res., 2009, 4(10):S123-S130 | DOI: 10.17221/473-SWR

Fog and rime water samples were collected at the meteorological observatory Milešovka in February and June 2006. In the samples, the soluble and insoluble pollutant concentrations were evaluated separately and the differences between the fog and rime water samples were studied. The comparison of the fog and rime water samples indicates that the mean soluble component concentrations in the air appear to be higher during the rime events than during the fog events at Milešovka. We recorded a larger mean particle size of the insoluble compounds in the fog water samples than in those of rime water. Some elements contained in the insoluble particles like Ca, Cl, C, Cu, Ag, were present largely in fog whole others, like Fe, Al, Si, Ti, prevailed in rime. In addition to the overall evaluation, the backward air trajectories were determined for each fog/rime event and the concentrations are presented as depending on the direction of the air particle transfer.

Detection of toxigenic Clostridium difficile in pig feces by PCR

S. Alvarez-Perez, P. Alba, J.L. Blanco, M.E. Garcia

Vet Med - Czech, 2009, 54(8):360-366 | DOI: 10.17221/76/2009-VETMED

: Clostridium difficile is considered an important uncontrolled cause of neonatal diarrhea. Also, the presence of bacteria in the feces of the animal could represent a zoonosic risk for the contamination of meat products. Therefore, it is necessary to have procedures available for the early detection of C. difficile in animals. The current study describes a new semi-automated procedure for the recovery of C. difficile DNA from pig feces and subsequent amplification by polymerase chain reaction (PCR) of three different sequences: the triose phosphate isomerase gene tpi, specific for this bacterial species, and the tcdA and tcdB genes, which code for the A and B toxins of C. difficile, respectively. Twenty-two fecal samples microbiologically positive for C. difficile were used. The tpi and tcdA genes were amplified in all of them. The internal fragment of tcdB was detected from 21 of these extracts; the negative sample gave a positive result when a different primer pair was used. None of the 10 DNA extracts obtained from culture-negative samples gave a positive result. The method presented in this article eliminates the interference caused by the possible presence of PCR inhibitors. To the authors' knowledge, this is the first description of a PCR procedure for detection of C. difficile DNA from domestic animal feces.

Determination of indigestible neutral detergent fibre contents of grasses and its prediction from chemical composition

F. Jančík, P. Homolka, B. Čermák, F. Lád

Czech J. Anim. Sci., 2008, 53(3):128-135 | DOI: 10.17221/2716-CJAS

Five grass species (Dactylis glomerata L., Phleum pratense L., Lolium perenne L., Festuca arundinacea L.) and the hybrid Felina (Lolium multiflorum L. × Festuca arundinacea L.), commonly used in roughages for ruminants, were harvested at different maturities of primary growth (n = 60) and evaluated for contents of dry matter (DM), crude protein (CP), ash, crude fat, neutral detergent fibre (NDF), acid detergent fibre (ADF), acid detergent lignin (ADL), indigestible neutral detergent fibre (INDF) and digestible neutral detergent fibre (DNDF). INDF and DNDF contents were determined by in sacco rumen degradation of grasses for 12 days in non-lactating cows. ADL content was found to be highly correlated (P < 0.05) with DNDF (r = -0.87) and presented a reliable (R2 = 0.78; residual mean square error of 17.65 g/kg DM; P < 0.0001) parameter to predict INDF contents. Over a six-week period of maturation INDF contents increased (P < 0.0001) in all studied grasses. It was confirmed by this study that the INDF contents of grasses, which markedly increased during maturation, could be effectively predicted from ADL contents.

Effects in genetic evaluation for semen traits in Czech Large White and Czech Landrace boars

J. Wolf, J. Smital

Czech J. Anim. Sci., 2009, 54(8):349-358 | DOI: 10.17221/1658-CJAS

Data on 75 567 ejaculates from 1 417 boars of the breeds Czech Large White and Czech Landrace collected in 23 AI centres between 2000 and 2007 were analyzed. Fixed effects were estimated from a four-trait animal model for semen volume, sperm concentration, motility and percentage of abnormal spermatozoa and from single-trait animal models for the total number of spermatozoa and the number of functional spermatozoa. Both the total number of spermatozoa and the number of functional spermatozoa were highest in winter and lowest in summer. Boar's age had a strong influence on semen volume, the total number and the functional number of spermatozoa; these traits increased especially in the first phase. The percentage of abnormal spermatozoa also increased with age. An interval between successive collections of 7 to 10 days yielded the best values for all semen traits. As semen traits are of direct economic importance for AI centres, it can be expected that the estimation of breeding value for semen traits will become important and that AI centres will choose among top boars for production and female reproduction traits the boars with better semen production.

Influence of growth regulators and explants on shoot regeneration in carnation

J. K. Kanwar, S. Kumar

Hort. Sci. (Prague), 2009, 36(4):140-146 | DOI: 10.17221/1/2009-HORTSCI

The influence of growth regulators, explants and their interactions on in vitro shoot bud formation from callus was studied in Dianthus caryophyllus L. The leaf and internode explants were cultured on Murashige and Skoog (MS) medium containing different concentrations of growth regulators. The highest callus induction was observed with 2 mg/l 2,4-dichlorophenoxy acetic acid (2,4-D) and 1 mg/l benzyl adenine (BA). Out of twenty seven shoot regeneration media tested, only 2 mg/l thidiazuron (TDZ) and zeatin alone or in combination with naphthalene acetic acid (NAA) and/or indole acetic acid (IAA) could differentiate calli. The highest average number of shoots was observed with 2 mg/l TDZ and 1 mg/l IAA. Significant differences were observed in calli producing shoots and number of shoots per callus in the explants of leaf and internode. The shoots were elongated and multiplied on MS medium supplemented with 1 mg/l BA and solidified with 1% agar. The shoots were rooted and hardened with 76% survival success in pots after six weeks of transfer to the pots.

Effect of long-term application of manure and mineral fertilizers on nitrogen mineralization and microbial biomass in paddy soil during rice growth stages

J. Zhang, J. Qin, W. Yao, L. Bi, T. Lai, X. Yu

Plant Soil Environ., 2009, 55(3):101-109 | DOI: 10.17221/322-PSE

Net N mineralization rate (NMR), net N consumption rate (NCR), microbial biomass carbon (MBC) and nitrogen (MBN), potentially mineralizable N (PMN) and mineral N (N-NH+4 and N-NO-3) were measured in paddy soil at five growth stages of rice to determine the effect of long-term fertilization in subtropical China. The studied long-term treatments included CK (no fertilization), N, NP, NPK and NPK + OM (NPK plus organic manure). The NPK + OM treatment gave the highest values of the measured variables among all treatments. There was no significant difference in other treatments except for mineral N and PMN at early growth stages. All these variables were generally highest at transplanting stage as two thirds of fertilization was applied as basal fertilizers and the rice uptake was low. Then they decreased or leveled off with the rice growth stages except for MN in all treatments. Stepwise regression revealed that NMR was significantly correlated with MBC and N-NH+4 (R2 = 0.954, P < 0.01) at all rice growth stages. So, mineral plus manure fertilizer application and more mineral fertilizer as topdressing were recommended in subtropical paddy soil.

Cadmium balance in soils under different fertilization managements including sewage sludge application

K. Čásová, J. Černý, J. Száková, J. Balík, P. Tlustoš

Plant Soil Environ., 2009, 55(8):353-361 | DOI: 10.17221/142/2009-PSE

Simple balance of Cd input by different treatments and removal by agricultural crops was investigated in an ongoing precise long-term field experiment with application of sewage sludge (SS), farmyard manure (FYM), and mineral fertilizers (NPK). Potatoes, wheat and barley were grown in a rotation at 4 experimental sites of the Czech Republic with the aim to assess the risk of Cd accumulation in soil and plants under different soil and climate conditions. The results showed significant differences in Cd content of the input materials used, and in Cd inputs to soils under different fertilization managements. Three applications of sewage sludge during 1996-2005 resulted in total addition of 110 g Cd/ha into soil, which was by one order of magnitude higher than Cd addition in FYM or NPK treatments. From the total amount of sludge-borne Cd, only small portion was removed by harvests of crops (approximately 3.5%). Soil conditions significantly affected Cd input-removal balance. The highest Cd removals were obtained on soils with the lowest pH. The highest Cd removal was achieved by potato tubers followed by wheat and barley plants. The results showed that the risk of Cd accumulation in soils is high, especially with repeated sludge applications.

The national and regional impacts of direct payments modulation in the Czech Republic

T. Medonos, L. Jelínek, J. Humpál

Agric. Econ. - Czech, 2009, 55(4):200-210 | DOI: 10.17221/22/2009-AGRICECON

This paper addresses (ex ante) the issue of the potential impact of the modulation of direct payments on a sector and regional scale in the Czech Republic. The ultimate version of the compulsory modulation measure adopted under the Health Check of the Common Agricultural Policy (CAP) assumes the reduction of direct payments if the total individual claim exceeds 5 thousand € or 300 thousand € level. The Czech agricultural sector will be impacted by this measure substantially, given the large scale farming enterprises. In 2013, the total farmers' direct payments will be cut by more than 10% (€ 91 million). Moreover, there are regional differences in farm structures (the average farm size and the extent of collectivization) which will bring about various effects of policies in the heterogeneous regions. The analysis further shows that the regions that are least affected are at the same time more environmental sensitive and are mostly situated in the mountainous or sub-mountainous parts of the country or more urban areas than the average. Hence the effect of the modulation, from a purely environmental perspective, may not contradict the objectives of other environmental policies. That is to say the regions that need support the most will be reduced the least. However, the picture is less obvious in the regional economies where more rural regions (potentially more vulnerable with socio-economic problems) tend to be more affected.

Effect of initial height of seedlings on the growth of planting material of Norway spruce (Picea abies [L.] Karst.) in mountain conditions

A. Jurásek, J. Leugner, J. Martincová

J. For. Sci., 2009, 55(3):112-118 | DOI: 10.17221/97/2008-JFS

Common ways of nursery cultivation and sorting the planting material of mountain provenances of Norway spruce (Picea abies [L.] Karst.) are connected with the risk of undesirable narrowing of the genetic spectrum of populations. Investigations in spruce plantations established by different planting materials found out very good growth (total height is 125 cm 9 years after outplanting) and health status of these slowly growing seedlings planted in extreme mountain conditions. In order to prevent the genetic spectrum narrowing, we recommend to cultivate all seedlings including smaller outsorted (commonly culled) ones. The smallest seedlings can be grown one year longer and subsequently planted out in the same locality as the remaining planting material of the same seed lot.

Different technologies of floodplain forest regeneration from the aspect of soil changes

N. Pernar, E. Klimo, S. Matić, D. Bakšić, H. Lorencová

J. For. Sci., 2009, 55(8):357-367 | DOI: 10.17221/8/2009-JFS

Like in other types of forests the greatest changes in the soil of floodplain forest stands occur during their regeneration. These changes are manifested as changes in the content and dynamics of organic matter in the soil. Research was conducted in oak and ash floodplain forests in the eastern part of Croatia and in southern Moravia in the Czech Republic. The results showed that the type and extent of these changes depended, in addition to environmental factors, also on the technology of forest regeneration. The natural regeneration of oak in floodplain forests of Spačva (eastern Croatia) protects soil from dramatic changes in soil by successive regeneration felling and that it retains the plant cover permanently. The weight of organic matter on the soil surface is increased after regeneration till the period when the effect of thinning becomes evident (about 70 years). In the surface mineral layer of soil the pH value increases after shelterwood felling. Stand regeneration with clear-cutting results in a rapid change in the conditions of surface humus accumulation and decomposition. The process of organic residue accumulation is interrupted in the clearings. In the preparation of soil/site by ploughing, the concentrations of nitrogen and carbon slightly decrease. The management impact depends on the method of site preparation for the establishment of a new stand. The selection of a method of the floodplain forest regeneration (particularly of oak) is markedly dependent on actual ecological conditions and on ecological and historical experience of the given region.

Oxidation Changes of Vegetable Oils during Microwave Heating

D. Lukešová, J. Dostálová, E. El-Moneim Mahmoud, M. Svárovská

Czech J. Food Sci., 2009, 27(10):S178-S181 | DOI: 10.17221/929-CJFS

Oxidation changes of different types of vegetable oils were studied during microwave heating. Samples of vegetable oils (rapeseed, sunflower, soybean and corn oil), commercially available at the market in the Czech Republic, were heated in a microwave oven. Parameters as peroxide value, conjugated dienes and trienes levels were determined in oil samples before and after heating in the period from 3 to 30 minutes.

Evaluation of crop effects on runoff and washout of soil from the surface of agricultural landOriginal Paper

Jana Podhrázská, Jana Uhlířová, Stanislav Hejduk

Soil & Water Res., 2009, 4(4):142-148 | DOI: 10.17221/12/2009-SWR

Measurements of the runoff intensity (i.e. its volume and amounts of washed out soil particles) were performed on experimental plots with the slope gradient of 5° within the period of 2004-2008. Experimental plots were covered with different types of crops: crops with wide rows (maize, potatoes), no row crops (cereals) and permanent grasslands (both extensively and intensively managed). The main objective of this study was to quantify the effect of individual crops on the reduction of runoff and erosion transport (i.e. washout) of soil from the surface of agricultural land. Data measured on individual experimental plots were compared with control, which was represented by a plot of bare soil. As compared with control, markedly reduced values of both runoff and washout (86 and 99%, respectively) were measured on plots covered with cereals within the study period. In maize stands, the corresponding values were 21 and 11%, respectively. The obtained results may support and contribute to the proposal of organisational soil protection measures and their implementation on agricultural land. In erosion-endangered localities an appropriate selection of individual crops represents an important tool, which can significantly support other protective measures, especially those of technical character.

Vaginal fibroleiomyoma in a cow: a case report

N. Timurkaan, M. Aydin, F. Yilmaz, A. Cevik

Vet Med - Czech, 2009, 54(3):138-141 | DOI: 10.17221/7/2009-VETMED

: This paper describes a case of fibroleiomyoma seen in the vagina of a cow, diagnosed on the basis of macroscopic, microscopic and immunohistochemical findings. A five year-old female, Simmental and Brown Swiss crossbreed cow presented with six neoplastic masses located on the vaginal wall. The masses were surgically removed through the vaginal route and were firm and well demarcated. Microscopic examination showed that the non-encapsulated neoplastic nodules consisted of the admixture of smooth muscle and connective tissue. Immunohistochemical examination revealed strong focal positive reactions for smooth muscle actin and vimentin, but no positive reaction for CD 68. The tumour reported here was considered benign because of the lack of clear pleomorphism, invasivness, multinuclear giant cells and atypia, and low mitotic activity.

Genetic analysis of leaf hydraulics in sunflower (Helianthus annuus L.) under drought stress

S. Rauf, H.A. Sadaqat, I.A. Khan, R. Ahmed

Plant Soil Environ., 2009, 55(2):62-69 | DOI: 10.17221/260-PSE

Improvement in leaf hydraulics is directly related to the improvement of plant tolerance to drought stress. Therefore, a field and pot experiment was carried out to determine the type of genetic variability and selection of parental types on the basis of combining ability for leaf hydraulics. Genotypes showed similar performance in both experiments; higher values were shown by drought tolerant genotypes in all traits except for osmotic potential, which drought tolerant genotypes maintained lower. Osmotic adjustment in pot experiment showed the highest magnitude of additive type of genetic variability. Female showed a higher and significant contribution of general combining ability effects as compared to male; it suggests that within genotypes female rather than male mostly contribute for additive genes. AMES-10103 showed the highest general combining ability effects for traits such as turgor pressure and osmotic adjustment.

Diversification of farm business

Š. Buday, Z. Federičová, R. Vajcíková

Agric. Econ. - Czech, 2009, 55(2):77-83 | DOI: 10.17221/583-AGRICECON

One of the measures of the Sectoral Operational Programme Agriculture and Rural Development is focused on the diversification of agricultural activities. The analysis of the measure showed the greatest interest in financial support among the subjects aimed at agritourism and rural tourism. The field of tourism dominates also among the number of the approved projects. The share of other diversification activities is very low. The analysis of other profitable activities in the Farm Structure Census and Farm Structure Survey by the type of activities shows that the total number of agricultural enterprises with other profitable activities decreased in 2005 compared to 2001 and 2003. The total amount of agricultural enterprises with other profitable activities in the Slovak Republic reached 3 219 in 2001, 4 465 in 2003, and 2 066 enterprises in 2005. In 2005, the number of the enterprises increased in the field of craft industry, wood processing, fishery, generating energy from renewable resources and contracted work.

Production and humus form development in forest stands established on agricultural lands - Kostelec nad Černými lesy region

V. Podrázský, J. Remeš, V. Hart, W. Keith Moser

J. For. Sci., 2009, 55(7):299-305 | DOI: 10.17221/11/2009-JFS

The afforestation of agricultural lands was carried out under different site and ecological conditions, including lower and medium elevated localities. The present study documents the rapidity of accumulation of surface layers and their characteristics in stands of Scots pine (Pinus sylvestris), Norway spruce (Picea abies), birch (Betula verrucosa) and Douglas fir (Pseudotsuga menziesii) in the territory of the Training Forest Enterprise in Kostelec nad Černými lesy, at the altitude 430 m a.s.l., on the site of nutrient-poor gleyed soils. The plots were compared with the neighbouring continuously forested site covered with old pine-spruce stand and with near-situated arable field. During the first roughly 40 years, considerable changes were documented on the afforested plots. Forest-floor humus layers in the coniferous stands have already been formed, the humus forms being more favourable compared with the old forest site. Acidification and loss of nutrients run in the upper mineral horizons. These processes were also responsible for the less favourable character of the forest soil in the old stand. Birch showed minor shifts of soil properties in the mineral horizon compared to the conifers; the surface humus accumulation was not observed there yet. The lowest degradation among conifers was shown in Douglas fir, intensively taking up deficient nutrients on the other hand.

How do lepidopteran seasonal guilds differ on some oaks (Quercus spp.) - A case study

M. Turčáni, J. Patočka, M. Kulfan

J. For. Sci., 2009, 55(12):578-590 | DOI: 10.17221/53/2009-JFS

The differences between oak lepidopteran communities were studied in Slovakia in 1993 and 1994. Sampling was undertaken between April and October on 3 oak species (Quercus robur, Q. petraea, Q. rubra). Biological traits of larvae were examined in order to explain differences in seasonal guilds among oaks. Communities varied in structure and abundance. Species richness in four seasonal guilds (flush, late spring, summer and autumn feeders) had a similar pattern on each of the studied oak species. The guild of flush feeders had the richest species assemblage, followed by the late spring feeder guild and both guilds were significantly richer than the summer feeder guild and autumn feeder guild.

Glucose, l-Malic Acid and pH Effect on Fermentation Products in Biological Deacidification

A. Kunicka-Styczyńska

Czech J. Food Sci., 2009, 27(10):S319-S322 | DOI: 10.17221/604-CJFS

Industrial wine yeasts Saccharomyces cerevisiae Syrena, an interspecies hybrid (S. cerevisiae × S. bayanus) HW2-3 and Schizosaccharomyces pombe met 3-15 h+>/sup> were examined to determine changes in fermentation profiles in different environmental conditions in YG medium with different concentrations of glucose (2, 6, 40 or 100 g/l), L-malic acid (4, 7 or 11 g/l) and at pH 3.0, 3.5 and 5.0. The results were obtained by HPLC method (organic acids, acetaldehyde, glycerol, diacetyl) and enzymatically (L-malic acid, ethanol). In anaerobic conditions (100 g/l glucose), the optimal parameters for L-malic acid decomposition for S. cerevisiae Syrena and the hybrid HW2-3 were 11 g/l L-malic acid and pH 3.0 and 3.5, respectively. S. pombe expressed the highest demalication activity at 40 and 100 g/l glucose, 7 g/l L-malic acid and pH 3.0. The fermentation profiles of selected metabolites of yeast were unique for specific industrial strains. These profiles may help in the proper selection of yeast strains to fermentation and make it possible to predict the organoleptic changes in the course of fruit must fermentation.

Release of Strawberry Aroma Compounds by Different Starch-Aroma Systems

R. Vidrih, E. Zlatić, J. Hribar

Czech J. Food Sci., 2009, 27(10):S58-S61 | DOI: 10.17221/912-CJFS

In the food industry, the addition of flavours is used to reinforce the aroma profile of different goods. However, interactions between starch and aroma compounds can occur, and this can impact upon aroma release and perception. In the present study, we have investigated the influence of starch type on aroma release from starch-aroma systems. The food model system used was composed of an aqueous starch dispersion (1 g dry starch/100 g dispersion) and 10 aroma compounds (ethyl butanoate, ethyl 2-methylbutanoate, ethyl 3-methylbutanoate, ethyl pentanoate, methyl hexanoate, ethyl hexanoate, methyl ethyl propanoate, hexyl acetate, 3-hexenol, and phenyl methyl acetate). Different commercially available starches were used: Amilogels P, K, PDP, G, MVK, HP, OK and HPW, and carrageenan (Amilogel CAR) and guar gum (Amilogel GG). Aroma release from these starch-aroma systems into the gas phase above food (headspace) were monitored by GC-MS analysis with a solid-phase micro-extraction technique. The smell of the starch-aroma system was also evaluated sensorially by a trained panel. The release of aroma compounds from the different starch-aroma systems was statistically significant (P < 0.0001) for all of the aroma compounds, with the exception of ethyl pentanoate. A correlation between the concentration of individual aroma compounds in the headspace and the sensory evaluation (smell) was seen. Starch-aroma systems comprising corn starch (Amilogel G), physically modified starches that are soluble in cold water (Amilogels K, PDP), and hydroxypropyl distarch phosphate (Amilogels HP) had sensorially superior smells compared to the other types of starches tested. At the same time, the headspace GC-MS analyses showed ethyl butanoate, ethyl 2-methylbutanoate, ethyl 3-methylbutanoate and ethyl pentanoate to be at the highest concentrations, which are all typical aroma compounds of strawberry fruit, and which also have low perception thresholds. Dextrin-roasted starch, guar gum and carrageenan provided the lowest sensory scores, although in contrast, they more strongly retained these aroma compounds.

Bearing capacity and corrosion weight losses of the bonded metal joints in the conditions of Indonesia, North Sumatra province

D. Herák, M. Műller, J. Karanský, O. Dajbych, S. Simanjuntak

Res. Agr. Eng., 2009, 55(3):94-100 | DOI: 10.17221/5/2009-RAE

: The article is focused on the analysis of the bonded metal joints capacity and corrosion weight losses in the conditions of equatorial Indonesia - North Sumatra province. For the purpose of the given article, the province was divided into three main climatic zones: Medan, Balige, Pagarbatu, where the dependence was observed of the bonded joints capacity on the duration of the weather exposure. The joints life and their further usability were predicted based on the analyses of the measured values.

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