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Results 3361 to 3390 of 4598:

Enzyme activities of urban soils under different land use in the Shenzhen city, China

Z.J. Shi, Y. Lu, Z.G. Xu, S.L. Fu

Plant Soil Environ., 2008, 54(8):341-346 | DOI: 10.17221/415-PSE

Urbanization has drastically changed soil properties, and an assessment of these changes is essential for soil management and soil health. The activities of urease, acid phosphatase, invertase and catalase, soil organic matter, pH, electrical conductivity (EC) and clay (< 0.01 mm) content of urban soils under two land-uses in the central built-up area of the Shenzhen city were investigated, and multivariate analysis was used to study the relationship between soil enzymes and soil physical-chemical properties. The results showed that invertase activity in roadside soil was significantly higher than that in urban park soil, whereas catalase activity was significantly higher in urban park soil. Soil organic matter had significant positive correlation with activities of invertase, urease and acid phosphatase but not with catalase. Soil pH had a significant negative direct effect on urease and acid phosphatase activity, but the effect was counteracted by positive indirect effect of soil organic matter. Soil EC had a positive direct effect on activities of catalase and there was a significant correlation between soil EC and soil catalase activities. Soil organic matter, soil pH and EC were the major factors influencing activities of soil enzymes.

Consequences of the water deficit on water relations and symbiosis in Vigna unguiculata cultivars

A.K.S. Lobato, R.C.L. Costa, C.F. Oliveira Neto, B.G. Santos Filho, M.C. Gonçalves-Vidigal, P.S. Vidigal Filho, C.R. Silva, F.J.R. Cruz, P.M.P. Carvalho, P.C.M. Santos, A. Gonela

Plant Soil Environ., 2009, 55(4):139-145 | DOI: 10.17221/1615-PSE

The study aimed at evaluating and comparing changes provoked by the water deficit on water relations and nitrogen fixation in two Vigna unguiculata cultivars, as well as at indicating which cultivar is more tolerant under water deficiency. The experimental design used was entirely randomized in factorial scheme, with 2 cultivars (Pitiuba and Pérola) and 2 water regimes (control and stress). The parameters evaluated were the leaf relative water content, stomatal conductance, transpiration rate, nodule number, nodule dry matter, nitrate reductase enzyme activity, ureide concentration and leghemoglobin in nodule. The stomatal conductance of the Pitiuba and Pérola cultivars under water deficit were 0.20 and 0.01 mmol H2O/m2/s, respectively. The nitrate reductase activity of the plants under stress was significantly reduced in both cultivars. The leghemoglobin in the Pitiuba and Pérola cultivars under water stress had the concentrations of 58 and 41 g/kg dry matter, respectively. The parameters investigated in this study suggest that the Pitiuba cultivar under water deficit suffers from smaller changes, when compared with Pérola cultivar.

Corn yield response to partial rootzone drying and deficit irrigation strategies applied with drip system

A. Yazar, F. Gökçel, M.S. Sezen

Plant Soil Environ., 2009, 55(11):494-503 | DOI: 10.17221/96/2009-PSE

This paper evaluates the effect of partial root zone drying (PRD) and deficit irrigation (DI) strategies on yield and water use efficiency of the drip-irrigated corn on clay soils under the Mediterranean climatic conditions in Southern Turkey. Four deficit (PRD-100; PRD-75; PRD-50; and DI-50) and one full irrigation (FI) strategies based on cumulative evaporation (E pan) from class A pan at 7-day interval were studied. Full (FI) and deficit irrigation (DI-50) treatments received 100 and 50% of Epan, respectively. PRD-100, PRD-75 and PRD-50 received 100, 75 and 50% Epan value, respectively. The highest water use was observed in FI as 677 mm, the lowest was found in PRD-50 as 375 mm. PRD-100 and DI-50 resulted in similar water use (438 and 445 mm). The maximum grain yield was obtained from the FI as 10.40 t/ha, while DI-50 and PRD-100 resulted in similar grain yields of 7.72 and 7.74 t/ha, respectively. There was a significant difference among the treatments with respect to grain yields (P < 0.01). The highest water use efficiency (WUE) was found in PRD-100 as 1.77 kg/m3, and the lowest one was found in FI as 1.54 kg/m3.

Measurement of water infiltration in soil using the rain simulation method

P. Kovaříček, R. ©indelář, J. Hůla, I. Honzík

Res. Agr. Eng., 2008, 54(3):123-129 | DOI: 10.17221/711-RAE

: For the measurement of the infiltration speed under operational conditions, we were equipped by a rain simulator with the measuring surface of 0.5 m2. The infiltration speed is determined from the defined rain intensity and water surface runoff from the measured surface. The retained water mass from the surface runoff is recorded at regular time intervals over the whole measuring period. The beginning of the water runoff from the measured surface indicates the beginning of elutriation. The measuring time is finished after the infiltration speed has been stabilised. The beginning of elutriation and infiltration speed stabilisation are typical and mutually comparable parameters for defined soil properties at the site followed.

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.

Diagnostic testing of different stages of avian tuberculosis in naturally infected hens (Gallus domesticus) by the tuberculin skin and rapid agglutination tests, faecal and egg examinations

J.E. Shitaye, L. Matlova, A. Horvathova, M. Moravkova, L. Dvorska-Bartosova, I. Trcka, J. Lamka, F. Treml, V. Vrbas, I. Pavlik

Vet Med - Czech, 2008, 53(2):101-110 | DOI: 10.17221/1984-VETMED

Avian tuberculosis (ATBC) is a significant cause of morbidity and mortality in birds in zoos and breeding establishments. The primary sources of Mycobacterium avium subsp. avium (MAA) of serotypes 1, 2 and 3 are infected animals (esp. birds), who shed MAA in different ways and thus contaminate the environment. The first aim of this work was to compare the efficiency of the diagnostic methods that are routinely used for the diagnosis of ATBC (skin test, serology and culture of faeces and eggs) in naturally infected hens with different levels of infection. The second aim was to determine the excretion rate of MAA in faeces and eggs. The tuberculin skin test gave a positive result in nine (42.9%) infected hens of which four (57.1%) and one (14.3%) were heavily and slightly infected hens, respectively. A positive serological response to MAA-b antigen (water bird isolate of serotype 1) was observed in five (23.8%) and to MAA-p antigen (pig isolate serotype 2) in seven (33.3%) hens. No correlation between serological and skin-test data was found. The results show that both techniques, serological and skin-test data are inadequate for the diagnosis of ATBC. In consecutively euthanized hens, with heavy infection and tuberculous lesions, serological positivity was significant (P < 0.05) in comparison with slightly infected hens lacking tuberculous lesions. Faecal culture detected MAA in 50 (29.8%) of 168 samples collected for eight days before euthanasia. MAA excretion in faeces was intermittent, but significantly (P < 0.01) higher in heavily infected hens. No mycobacteria were detected in any of the 43 examined eggs, which implies that the shedding of MAAand/or transmission of ATBC through eggs may not be frequent events.

Helicobacter species and gastric ulceration in horses: a clinical study

B. Bezdekova, J. Futas

Vet Med - Czech, 2009, 54(12):577-582 | DOI: 10.17221/161/2009-VETMED

The goal of this study was to gather more clinical information about the relationship between Helicobacter species and gastric ulceration in horses. Twenty seven privately owned patients were selected for the clinical study. All horses were gastroscopically examined and biopsies were taken from the glandular mucosa. Stomach biopsies were examined using a PCR assay specific for Helicobacter pylori and/or Helicobacter equorum. In addition, faecal samples from thirteen horses were examined using a PCR assay specific for H. equorum. Twenty five horses (25/27; 93%) had lesions in their stomach. Gastric biopsies from twenty two horses were examined using the H. pylori specific PCR and the ure gene was detected in three of them (3/22; 14%). H. equorum DNA was not found in the stomach of any of the ten horses examined. H. equorum was diagnosed in only one faecal sample from the thirteen horses examined (1/13; 8%) and that case was not associated with gastric pathology. This study shows the possibility of sporadic detection of the ure gene in the equine stomach affected by mucosal ulceration.

Growth of wild cherry (Prunus avium L.) in a mixture with other species in a demonstration forest

R. Stojecová, I. Kupka

J. For. Sci., 2009, 55(6):264-269 | DOI: 10.17221/71/2008-JFS

Wild cherry is one of the noble hardwood species that increase the biodiversity of our forests and at the same time it could increase the income for forest owners. The preconditions for achieving these goals are the high quality of stem and appropriate silvicultural management. This means that wild cherry should occupy the main crown layer in the stand. The height/frequency diagram depicts two groups of wild cherry trees in the stand belonging to dominant/codominant and suppressed tree classes. Height periodic increment (measured between the years 2001 and 2007) is significantly (p < 0.01) different in these two groups confirming that there is no transition chance for the trees from the suppressed group to become a part of the main crown layer and play the role of future crop tree. The same is true of the diameter/frequency diagram which also has a two-peak shape remaining also at the end of the surveyed period. Our result suggests that silvicultural care should be focused only on trees belonging to future crop trees.

Impact of the investment grants from the European funds on the development of agriculture and rural areas

S. Buchta, T. Buchta

Agric. Econ. - Czech, 2009, 55(2):59-66 | DOI: 10.17221/584-AGRICECON

The article describes the impact of the Sectoral Operational Programme Agriculture and Rural Development and the Rural Development Plan 2004-2006 on the rural development in 2004-2007. In addition to the implementation analysis of these programming documents, the article also describes territorial distribution of direct subsidies and state aid over the monitored period of 2004-2007. A summarized overview is given for the drawdown of all types of subsidies and their proportionate amounts. The evaluation of all subsidies has shown that most of them were paid to the Northern and Eastern parts of Slovakia, due to the agroenvironmental and direct payments (mostly LFA). The article also describes, in quantitative terms, the social and economic impact of investment subsidies from the Sectoral Operational Programme Agriculture and Rural Development and the Rural Development Plan 2004-2006, based on the monitoring indicators of result and impact. The comparison of the socio-economic development of the beneficiaries and non-beneficiaries of investment subsidies from the SOP and RDP has shown a faster growth in income of the beneficiaries, as well as a faster growth of labour productivity. Also, the subsidies significantly helped to reduce the decrease in employment and/or helped to maintain the employment in agriculture.

Determination of antagonistic starter cultures for pickle and olive fermentation processes

Ahmet Hilmi Çon, Nihat Karasu

Czech J. Food Sci., 2009, 27(3):185-193 | DOI: 10.17221/86/2008-CJFS

In the present study, the main purpose was the selection of antagonistic starter cultures for pickle and olive fermentation processes. The chemical and microbiological properties of fermented 70 pickle and 16 olive samples collected from the province of the west part of Turkey were analysed. Subsequently, lactic acid bacteria strains producing bacteriocin-like metabolites were isolated and identified. From 86 samples, 16 isolates were chosen, depending on their partial antimicrobial activity against at least one selected indicator. 13 out of this 16 isolates were identified as Lactobacillus plantarum whereas 3 of them proved to be Lactobacillus pentosus. Moreover, all the relevant isolates were found to be potent acid producers. All these results obviously suggest that the isolated Lactobacillus plantarum 9 and 25 were appropriate for them to be proposed as starter cultures in fermented pickle and olive production.

Sensitivity of Assessors to Ferrous Salts

Z. Panovská, A. Váchová, J. Řeřichová

Czech J. Food Sci., 2009, 27(10):S333-S336 | DOI: 10.17221/1082-CJFS

Taste is the chemical sensation whose function is not very well known. Recently it was shown that the range of taste is more extensive than the five basic taste sweet, salty, bitter, sour and umami. A metallic taste has been suggested as another basic taste, but its mode of perception is not well understood and has not been really accepted in the taste literature. Ferrous sulphate solutions were presented to the assessors so their sensitivity and best estimate thresholds (BET) were measured. The best estimated threshold range was 0.00049-0.00669 g/l for demineralised water, 0.00079-0.00669 g/l for distilled water and 0.00108-0.00669 g/l for tap water.

The accumulation of copper in soils of the Italian region Emilia-Romagna

M. Toselli, P. Schiatti, D. Ara, A. Bertacchini, M. Quartieri

Plant Soil Environ., 2009, 55(2):74-79 | DOI: 10.17221/317-PSE

The investigation was carried out in 2005, on 30 plots chosen in the Central-Eastern part of the Emilia Romagna region, and cultivated with pear, grapevine and vegetable crops under the organic management system. For each crop, 5 plots with a level of calcium carbonate > 10% and 5 plots with a level of calcium carbonate < 3% were selected. For pear and vine, soil analyses were performed at the depths of 0-20 cm and 20-50 cm, for vegetable at the depth of 0-50 cm. Organic matter content was higher in pear-cultivated plots, followed by grapevine and vegetable crops. Copper application rate, from 1998 to 2004, was higher in pear and grapevine than in vegetable plots. Soil total and DTPA-extractable Cu were higher in pear and grapevine than in vegetable-cultivated plots. Soil DTPA-extractable Cu concentration was higher in the upper horizon than at 20-50 cm soil depth. The increase of total Cu in pear and vine-cultivated plots was combined with the increase of soil inactive Cu.

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

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

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.

Growth and carcass performance of bull calves born from Hereford, Simmental and Charolais cows sired by Charolais bulls

H. Kamieniecki, J. Wójcik, R. Pilarczyk, K. Lachowicz, M. Sobczak, W. Grzesiak, P. Błaszczyk

Czech J. Anim. Sci., 2009, 54(2):47-54 | DOI: 10.17221/1669-CJAS

The analysis comprised purebred Charolais bull calves (CH) and crossbred bull calves born from Hereford (CH × HE) and Simmental (CH × SI) cows. Body weights and daily gains were measured in subsequent periods of the experiment and the post-slaughter evaluation was carried out. Carcass lean weight and dressing percentage were evaluated, as well as the lean content of five prime cuts. Total weight of the five prime cuts was measured and its share in the half-carcass weight was determined. The rib-eye area was also measured. The CH × SI crossbreds reached significantly higher body weights at weaning, 210-day body weights and weights at finishing, as well as significantly higher daily gains in all the periods (P < 0.05, P < 0.01) and were characterized by the heaviest carcasses and most cuts, particularly the round. The crossbreds had the highest total weight of five prime cuts and total lean weight, highest weight of the round and lean weight in the round. Other relationships were found analyzing the share of each cut in the carcass. The share of tenderloin and rump in the carcass of CH × SI was significantly lower compared to the purebred bulls (P < 0.01) and CH × HE (P < 0.05). They also had a significantly lower share of the shoulder, shank and shin, as compared to the other groups, as well as a significantly higher (P < 0.05) share of the neck, as compared to the purebred bulls. The purebred bulls also achieved good results and had the highest share of the prime cuts and the largest mean rib-eye area.

The effect of rockwool on physical properties of growing substrates for perennials 38

M. Dubský, F. ©rámek

Hort. Sci. (Prague), 2009, 36(1):38-43 | DOI: 10.17221/22/2008-HORTSCI

The possibility of peat replacement with crushed water absorbent rockwool in growing substrates in the amount of 35% vol. was verified in the experiment with perennials in containers. Three types of substrates, i.e. peat, and two mixtures of peat with alternative components - green waste compost (25% vol.) or composted spruce bark (40% vol.) were compared. A sand box in the range of -0.5 to -10 kPa was used to determine retention curves and other physical properties of the components and substrates. The addition of rockwool to the peat substrate increased content of air and easy available water, the plant growth was not affected. Plants grown in substrates with alternative organic components were smaller in comparison to peat substrate. The growth of perennials significantly decreased, mainly in substrates with bark, but the plants had good market value. The addition of rockwool to these substrates had no significant effect on the growth. Crushed rockwool in the amount of 35% vol. can replace peat in peat substrates and in mixtures with alternative components.

Tolerance of Norway spruce (Picea abies [L.] Karst.) embryogenic tissue to penicillin, carbapenem and aminoglycoside antibiotics

J. Malá, D. Pavingerová, H. Cvrčková, J. Bříza, J. Dostál, P. ©íma

J. For. Sci., 2009, 55(4):156-161 | DOI: 10.17221/100/2008-JFS

Somatic embryogenesis is conveniently utilized for the preparation of Norway spruce (Picea abies [L.] Karst.) transgenic clones by means of Agrobacterium. The establishment of successful transformation protocol requires to determine the tolerance of growing embryogenic tissue to antibiotics in culture and selective media. In 5 Norway spruce lines (genotypes) differences in the tolerance of embryogenic tissues to penicillin antibiotics (amoxicillin, carbenicillin, and ticarcillin), carbapenem antibiotic (meropenem) used for the Agrobacterium growth prevention, and aminoglycoside antibiotic (kanamycin) used in selective media were determined. Of the penicillin derivatives, amoxicillin was optimally tolerated in all lines and, in addition, its highest concentration accelerated growth in more rapidly growing lines. Ticarcillin was similarly tolerated but no growth acceleration was observed in any line. As regards carbenicillin, only the lowest concentration was observed to be well tolerated by all lines whereas all concentrations of meropenem were well tolerated in all lines except for slowly growing line 28, the growth of which was retarded by the concentration of 20 mg/l. The aminoglycoside antibiotic kanamycin was well tolerated by the embryonic tissue of all lines in the concentration of 10 mg/l and less in the concentration of 25 mg/l. The concentrations of 50 mg/l and 100 mg/l appeared as intolerable in all lines. Toxicity of kanamycin manifested at first in the browning and later in the growth cessation of embryogenic tissue.

Comparison of morphological and physiological parameters of the planting material of Norway spruce (Picea abies [L.] Karst.) from intensive nursery technologies with current bareroot plants

J. Leugner, A. Jurásek, J. Martincová

J. For. Sci., 2009, 55(11):511-517 | DOI: 10.17221/21/2009-JFS

High quality of planting material is an essential prerequisite for successful artificial forest regeneration. We carried out a detailed investigation aimed at differences between plantable bareroot and container plants of Norway spruce (Picea abies [L.] Karst.). Based on the results of this experiment, there exist marked differences in basic morphological traits between bareroot plants and plugs. The largest differences were observed in root collar diameter and root system volume. Differences in physiological quality (nutrient content, function of assimilatory organs) were also great. The results document that container seedlings of Norway spruce produced by intensive technology in controlled conditions of plastic greenhouses have very good predispositions for successful growth in difficult mountain conditions.

Integration and independence in the perspective of rural municipalities

H. Hudečková, M. Pitterling

Agric. Econ. - Czech, 2009, 55(12):596-604 | DOI: 10.17221/98/2009-AGRICECON

In order to develop the quality of life in small rural municipalities, their representation faces the thoughts about the perspective of these municipalities in economic terms (the capacity to finance long-term investments) as well as in the socio-cultural terms (the development of participation in public life embedded in the local identity). This article presents the results of the pilot empirical survey in one micro-region of the Czech Republic. The results of the in-depth interviews clearly indicate the preference of the investigated communities to choose the strategy of supporting their independence (which might result in the risk of lower ability to deal with economic problems) prior to the strategy to strengthen the economy of the community through merging the municipalities (and to risk the potential loss of local identity). The conclusions consider the possible forms of municipal cooperation reinforcing the capacity to address economic problems while preserving the autonomy of small rural municipalities. However, the low ability of the partnership cooperation of these municipalities is demonstrated.

Furan in food - a review

Janka VRANOVÁ, Zuzana CIESAROVÁ

Czech J. Food Sci., 2009, 27(1):1-10 | DOI: 10.17221/2843-CJFS

Furan and its derivatives were identified in a small number of heat-treated foods back in the 60's and 70's. In May 2004, US Food and Drug Administration published a report on the occurrence of parent furan in a number of thermally treated foods. Since furan has been classified as "possibly carcinogenic to human" by IARC, a great concern has been addressed to the analysis of this substance naturally-occurring in food. This paper gives a short overview on the mechanistic pathways of the parent furan formation in food by degradation of amino acids and/or reducing sugars, and oxidation of ascorbic acid and poly-unsaturated acids which can be induced by thermal or irradiation treatments; further, it deals with the metabolism and toxicology of furan as well as with the comparison of the methods of furan determination.

Changes of Vitamin C Content in Relation to the Range of Accumulation of Cd, Pb and Zn in Potato Tubers

J. Musilová, J. Bystrická, J. Tomáą, Z. Poláková, S. Melicháčová

Czech J. Food Sci., 2009, 27(10):S192-S194 | DOI: 10.17221/614-CJFS

The changes of vitamin C content in relation to Cd, Pb and Zn accumulation in 6 potatoes varieties: very early (Junior, Impala), early (Livera), middle early (Agria), medium-late (Asterix, Desirée) were surveyed in this work. The soil used in pot trial had pseudototal (in soil extract of aqua regia

Peronospora hariotii on Buddleja in the Czech Republic

Ivana ©afránková, Jiří Müller

Plant Protect. Sci., 2009, 45(1):12-15 | DOI: 10.17221/44/2008-PPS

A downy mildew was observed on Buddleja × weyeriana Weyer ex Rehd. (B. davidii × globosa) cv. Sungold in a nursery in the northern part of the Czech Republic in July 2008. This downy mildew disease of Buddleja (Butterfly Bush) had been unknown in the country so far. Characteristics of visual symptoms and microscopic features are described. The morphology of the fungus was typical for Peronospora hariotii, conforming to the published description by GÄUMANN (1919). The sexual stage was not found. This is the first report of Peronospora hariotii causing leaf spot disease on Buddleja in the Czech Republic.

Influence of Enterococci and Lactobacilli on Listeria

Kateřina Kučerová, Ivana Korbová, ©árka HORÁČKOVÁ, Eva ©viráková, Milada Plocková

Czech J. Food Sci., 2009, 27(11):SII12-SII17 | DOI: 10.17221/676-CJFS

A collection of lactic acid bacteria (38 Enterococcus and 41 Lactobacillus strains) was tested for the antilisterial activity against 15 Listeria spp. strains (two L. monocytogenes, one L. ivanovii and 12 L. innocua strains) using agar spot method. Out of all 79 bacteria only six Enterococcus strains (1/3A, 3/3A, 6/4D, 6/1A, 1282 and EN3) exhibited antilisterial activity against almost all used indicator strains, when their live cells were tested. When their cell free neutralised supernatants (CFNS) were tested against four selected indicator strains (L. innocua Ln-03, Ln-06, Ln-10 and L. monocytogenes CCM5576) only two Enterococcus spp. strains were active - E. faecalis 6/1A strain from raw cow milk of minor interest due to the activity of its CFNS only against L. innocua Ln-06 and thermolability of the compound and E. mundtii 1282 strain from goat raw milk with CFNS active against 13 Listeria spp. strains including L. monocytogenes. E. mundtii 1282 strain produced probably a bacteriocin, because it completely lost the activity after treatment CFNS with proteinase K.

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.

Evaluation of monitoring on Modrava catchments

Jiří PAVLÁSEK, Jana ŘEDINOVÁ, Petra SKALSKÁ

Soil & Water Res., 2009, 4(10):S66-S74 | DOI: 10.17221/475-SWR

In this paper is presented the comparison of the selected hydrometeorological data from two experimental micro-scale catchments Modrava 1 (0.1 km2) and Modrava 2 (0.17 km2) in upper parts of Bohemian Forest. These catchments differ mainly in the vegetation cover - a dead forest with very young trees (Modrava 1) and primary forest clearings with 10 to 15-year old young forest (Modrava 2). For comparison were used the data monitored close to the catchments outlets during the hydrological year 2007. Average hourly rainfall and runoff data were analysed. During the winter season, snow water equivalents were measured and the maximum value was added to the rainfall amount measured during the vegetation season for the estimation of total year precipitation on each catchment. The data of the air temperature and water conductivity measured in hourly time intervals were also compared. For the estimation of differences between the monitored data sets the cumulative values of the characteristics observed during whole year were computed. It follows from the comparison of the time series that the time rainfall distribution was similar during the year on both catchments with a higher total year precipitation and hour intensities on the catchment Modrava 2. The time distribution and total runoff depth were similar on both catchments. On Modrava 1 a faster recession of hydrographs could be seen which might relate to a lower retention capacity. The value of the water conductivity on the catchment Modrava 1 depended more on the changes of the runoff depth. The maximal values occurred during the peak discharges or in time of hydrographs rising. This fact can be the result of a lower stability of the soil profile in the catchment with dead forest cover.

Index of Volume 55Index

editors

Res. Agr. Eng., 2009, 55(4):I-III | DOI: 10.17221/1631-RAE

Ecological requirements of some ant species of the genus Formica (Hymenoptera, Formicidae) in spruce forests

A. Véle, J. Holuąa, J. Frouz

J. For. Sci., 2009, 55(1):32-40 | DOI: 10.17221/56/2008-JFS

Five types of stand stages (clearings-samplings, plantations, thinnings, thickets, and mature forests) of spruce forests were examined at the foothills of the Jizerské hory Mts. in summer 2005 and 2006. The presence of ants was surveyed by catching them into pitfall traps and observing on baits. Higher numbers of Formica fusca ants were found in clearings-samplings and in plantations. Their activity was higher at the soil and air temperature of 20-30°C. The peak of activity was observed in July. Most specimens were trapped at lighter habitats and in the sites with more than 50% herbaceous and gramineous vegetation cover. F. pratensis was trapped in plantations and thickets. It was active at the soil temperatures 12-21°C and air temperatures 16-25°C. It occurred both in dark and light areas. F. sanguinea most commonly occurred in thinnings. This species was the most active at the soil temperature 20-30°C. Its activity depending on air temperature grew almost linearly. It occurred both in dark and in light stand stages with at least 60% vegetation cover. F. truncorum was observed only in thinnings. The activity of F. truncorum was the highest at the air and soil temperatures 15-25°C. The peak of activity was recorded in July. It was observed only in stands with the quantity of incident radiation 1,030 lx and with 20-80% of undergrowth cover.

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

N. Pernar, E. Klimo, S. Matić, D. Bakąić, 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.

Viable strategies in volatile times

I. Tichá

Agric. Econ. - Czech, 2009, 55(5):229-232 | DOI: 10.17221/29/2009-AGRICECON

The article aims at the description and assessment of strategic options for companies which have necessary resources to take the advantage of the current economic downturn. The theoretical framework is based on two predominant approaches to competitive advantage and the practical implications for actions to be adopted are derived from the recommendations published recently by the leading consulting firms. While quick fixes ensuring a short-term survival (mostly financially based cost-saving measures) are an essential first step, a longer-term success lies in the effective adoption of the scenario-planning techniques, active competitors intelligence and a proactive attitude to restructuring through a combination of mergers, acquisitions and divestment decisions.

Changes in the Mineral Content in Cheeses of Different Compositions during 6 Months of Ripening

I. González-Martín, J. M. Hernández-Hierro, I. Revilla, A. Vivar-Quintana, I. Lobos-Ortega, C. González-Pérez

Czech J. Food Sci., 2009, 27(10):S114-S118 | DOI: 10.17221/1086-CJFS

The mineral content of cheese depends on the origin of the milk (cow, ewe, goat) and its ripening. In this work the effect of different factors on the mineral composition and the correlation between minerals (Ca, Fe, Mg, K, Na, and Zn) and the type of milk used are studied. The One-Way ANOVA procedure revealed that the effect of cow's milk was statistically significant on Fe, K, P, and Zn; goat's milk was statistically significant for Fe and Mg, and ewe's milk was statistically significant for K. The effect of the ripening time was statistically significant in all cases, except for Zn; the effect of the season was statistically significant for K, Mg and P and the effect of the year was statistically significant in the case of K, Na, P, and Zn. The percentage of cow's cheese was positively correlated with K and P; the percentage of ewe's cheese was negatively correlated with K, Mg, Na, and P and the percentage of goat's cheese was negatively correlated with Na, and P.

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.

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