Number of found documents: 384
Published from to

ANTIBACTERIAL EFFECT OF SELECTED NANOPARTICLES AS REVEALED BY DOUBLING TIME OF TREATED ANTHOMONAS CAMESTRIS PV. CAMPESTRIS CULTURES
Pečenka, J.; Svobodová, Kateřina; Eichmeier, A.; Baránek, M.
2016 - English
Besides many possibilities of applications of nanoparticles in the field of medicine, diagnostics, molecular biology, bioorganic chemistry or remediation of environment, there is also a potential of employment of nanoparticles as a tool for elimination and control of bacteria invading plant tissue. In this experiment an antibacterial activity of selected nanoparticles based on silver, gold and bimetallic silver/copper was tested on bacteria Xanthomonas campestris pv. campestris (Xcc) (strain 1279a). The strongest inhibitory effect represented by doubling time of treated cultures was measured in the presence of the smallest silver nanoparticles (9 nm) at the highest concentration (5 ppm). Keywords: nanoparticles; Xanthomonas campestris; doubling time Available at various institutes of the ASCR
ANTIBACTERIAL EFFECT OF SELECTED NANOPARTICLES AS REVEALED BY DOUBLING TIME OF TREATED ANTHOMONAS CAMESTRIS PV. CAMPESTRIS CULTURES

Besides many possibilities of applications of nanoparticles in the field of medicine, diagnostics, molecular biology, bioorganic chemistry or remediation of environment, there is also a potential of ...

Pečenka, J.; Svobodová, Kateřina; Eichmeier, A.; Baránek, M.
Mikrobiologický ústav, 2016

BIOGENIC AND SYNTHETIC AMORPHOUS SILICA - COMPARE AND INTERACTION WITH BACTERIAL SYSTEMS
Fijalkowski, M.; Adach, K.; Marešová, Helena; Kroisová, D.
2015 - English
The aim of the work is to compare the biogenic silica nanoparticles, which have been isolated from rice husks with synthetically produced silica brand Cab-O-Sil LM-150. The comparison is based on an evaluation of the two systems from the point of view of chemical composition, particle size and structure, ability to form clusters of particles and interactions with selected bacterial systems. Methods used for comparison were: SEM, EDX, TEM, FTIR, ICPOES and bacteriological tests. Husks are standardly contaminated by accompanying ions that are important for plant growth, but undesirable for obtaining a quality product. Rice husk used for the silica isolation were purified by boiling in 10% HCl for 2 hours. Rice husks were then washed with distilled water until pH 7. The dried and purified husks were burned in an oven at 650 degrees C of ramping temperature 10 degrees C/min during 2 hours. The obtained product has a chemical composition analogous to the synthetic product. Biogenic particles reach a size of about 20 nm, about 10 nm synthetic. Both materials have an amorphous structure. Interaction with bacterial systems was performed with Gram-negative bacteria Escherichia coli W3110 strain and Gram-positive bacteria Bacillus cereus. In both cases analogous behaviour was observed depending on the concentration of nanoparticles and reducing the growth rate of cultures of 8% for E. coli and 5% for B. cereus resulted nanoparticles at the concentration of 150 mg/litter of medium. Keywords: Biogenic silica; synthetic silica; chemical composition Available at various institutes of the ASCR
BIOGENIC AND SYNTHETIC AMORPHOUS SILICA - COMPARE AND INTERACTION WITH BACTERIAL SYSTEMS

The aim of the work is to compare the biogenic silica nanoparticles, which have been isolated from rice husks with synthetically produced silica brand Cab-O-Sil LM-150. The comparison is based on an ...

Fijalkowski, M.; Adach, K.; Marešová, Helena; Kroisová, D.
Mikrobiologický ústav, 2015

Gut microbiome and colorectal cancer
Tlaskalová-Hogenová, Helena; Klimešová, Klára; Zákostelská, Zuzana; Kverka, Miloslav; Hornová, Michaela; Vannucci, Luca; Štěpánková, Renata; Hudcovic, Tomáš; Kozáková, Hana; Rossmann, Pavel
2014 - English
The work deals with metagenomic approaches that are currently being used to decipher the genome of the microbiota (microbiome), and, in parallel, functional studies are being performed to analyze the effects of microbiota on the host. Keywords: gut; colorectal; cancer Available at various institutes of the ASCR
Gut microbiome and colorectal cancer

The work deals with metagenomic approaches that are currently being used to decipher the genome of the microbiota (microbiome), and, in parallel, functional studies are being performed to analyze the ...

Tlaskalová-Hogenová, Helena; Klimešová, Klára; Zákostelská, Zuzana; Kverka, Miloslav; Hornová, Michaela; Vannucci, Luca; Štěpánková, Renata; Hudcovic, Tomáš; Kozáková, Hana; Rossmann, Pavel
Mikrobiologický ústav, 2014

BATCH BIOREACTORS: WASTE WATER ENDOCRINE DISRUPTOR BIODEGRADATION BY WHITE ROT FUNGI
Křesinová, Zdena; Cajthaml, Tomáš
2013 - English
Endocrine disruptors (EDs) are members of a broad class of environmental organopollutants which are present in the environment. Due to the widespread presence in the surface water and wastewater, and their negative endocrine disrupting activity even at very low concentration, these EDs have received an increased attention in water quality management and health care. EDs encompass a variety of substances, including mammalian hormones (estrogens, androgens) and anthropogenic chemicals Keywords: organopollutants; jakost vody; odpadní vody Available at various institutes of the ASCR
BATCH BIOREACTORS: WASTE WATER ENDOCRINE DISRUPTOR BIODEGRADATION BY WHITE ROT FUNGI

Endocrine disruptors (EDs) are members of a broad class of environmental organopollutants which are present in the environment. Due to the widespread presence in the surface water and wastewater, and ...

Křesinová, Zdena; Cajthaml, Tomáš
Mikrobiologický ústav, 2013

TEMPERATURE INFLUENCE ON DESORPTION AND DETERMINATION OF BIOACCESSIBLE PAHS
Čvančarová, Monika; Pokorná, Lenka; Velebová, R.; Najmanová, P.; Cajthaml, Tomáš
2013 - English
Hydrophobic organic pollutants tend to adsorb onto soil particles which can cause a significant decrease in their bioaccessible fractions. Definition of the bioaccessibility is currently not unified; however it represents a part of total PAHs amount which is potentially available for biological processes. It is an important parameter which can be used for prediction of microbial degradation and environmental risk evaluation. This paper studies desorption behavior of PAHs at 20 and 60˚C. The desorption of PAHs from long-term contaminated soils was evaluated using resin Amberlite XAD- 2. A two-phase desorption model was used to calculate the desorption kinetic curves and F fractions which represent bioaccessible amount of PAHs. The results showed that the desorption of PAHs was significantly influenced by temperature. The greatest differences in the desorption behavior were observed at 5–6 ring PAHs. We compared the F fractions and the rate constants of individual PAHs which were determined at 20 and 60˚C. The results were also compared with sequential supercritical fluid extraction which has been already used for prediction of microbial degradation. Keywords: pahs; desorpce; biologie Available at various institutes of the ASCR
TEMPERATURE INFLUENCE ON DESORPTION AND DETERMINATION OF BIOACCESSIBLE PAHS

Hydrophobic organic pollutants tend to adsorb onto soil particles which can cause a significant decrease in their bioaccessible fractions. Definition of the bioaccessibility is currently not unified; ...

Čvančarová, Monika; Pokorná, Lenka; Velebová, R.; Najmanová, P.; Cajthaml, Tomáš
Mikrobiologický ústav, 2013

ENDOCRINE DISUPTIVE CHEMICALS: MECHANISMS OF WHITE ROT FUNGI BIODEGRADATION
Cajthaml, Tomáš; Křesinová, Zdena; Čvančarová, Monika; Maternová, H.; Filipová, A.
2013 - English
The main aim of this study was to elucidate mechanisms involved in EE2 and other EDs compounds degradation by white rot fungi. Results showed simultaneous involvement of ligninolytic enzymes and cytochrome P-450 in biodegradation. The present results indicate the advantage of utilization of WRF cultures for organopollutants degradation. Keywords: biodegradation; biodegradace; odbourávání Available at various institutes of the ASCR
ENDOCRINE DISUPTIVE CHEMICALS: MECHANISMS OF WHITE ROT FUNGI BIODEGRADATION

The main aim of this study was to elucidate mechanisms involved in EE2 and other EDs compounds degradation by white rot fungi. Results showed simultaneous involvement of ligninolytic enzymes and ...

Cajthaml, Tomáš; Křesinová, Zdena; Čvančarová, Monika; Maternová, H.; Filipová, A.
Mikrobiologický ústav, 2013

A NOVEL BIOAUGMENTATION APPROACH IN BIODEGRADATION OF ORGANIC POLLUTANTS IN CONTAMINATED SOIL
Lhotský, O.; Filipová, Alena; Innemanová, P.; Velebová, R.; Cajthaml, Tomáš
2013 - English
Polycyclic aromatic hydrocarbons (PAHs) belong among organic compounds that accumulate in the environment mainly resulting from human activities. Because of their potentially negative effects on human health, methods of their removal from the environment are intensively studied. In this work, a biodegradation method of bioaugmentation based on sequential stepwise mixing of inoculated soil with non inoculated soil was used. The subject of this work was an application of a bacterial consortium on a real contaminated (7399 mg.kg-1 of PAHs) soil. 8 bacterial strains isolated from other contaminated sites were inoculated. DNA was isolated from the samples during the inoculation process and the degradation of PAHs was monitored after 4 months. Keywords: soil; aromatické uhlovodíky polycyklické; aromatické uhlovodíky Available at various institutes of the ASCR
A NOVEL BIOAUGMENTATION APPROACH IN BIODEGRADATION OF ORGANIC POLLUTANTS IN CONTAMINATED SOIL

Polycyclic aromatic hydrocarbons (PAHs) belong among organic compounds that accumulate in the environment mainly resulting from human activities. Because of their potentially negative effects on human ...

Lhotský, O.; Filipová, Alena; Innemanová, P.; Velebová, R.; Cajthaml, Tomáš
Mikrobiologický ústav, 2013

Imunomodulační efekt bakteriálního lyzátu Lactobacillus Casei DN 1140001 na vznik a vývoj experimentálně vyvolaného střevního zánětu
Zákostelská, Zuzana; Kverka, Miloslav; Rossmann, Pavel; Klimešová, Klára; Mrázek, Jakub; Kopečný, Jan; Tlaskalová-Hogenová, Helena
2010 - Czech
Lactobacillus casei DN 114001 patří mezi jedno z nejvíce studovaných probiotik současnosti. Cílem této práce bylo zjistit, zda frakce izolované z tohoto probiotika dokáží zmírnit průběh střevního zánětu. Lactobacillus casei DN 114 001 belongs to one of the most studied probiotics today. The aim of this study was to determine whether this fraction isolated from probiotics can alleviate the course of intestinal inflammation Keywords: probiotics; vývoj; evoluce Available at various institutes of the ASCR
Imunomodulační efekt bakteriálního lyzátu Lactobacillus Casei DN 1140001 na vznik a vývoj experimentálně vyvolaného střevního zánětu

Lactobacillus casei DN 114001 patří mezi jedno z nejvíce studovaných probiotik současnosti. Cílem této práce bylo zjistit, zda frakce izolované z tohoto probiotika dokáží zmírnit průběh střevního ...

Zákostelská, Zuzana; Kverka, Miloslav; Rossmann, Pavel; Klimešová, Klára; Mrázek, Jakub; Kopečný, Jan; Tlaskalová-Hogenová, Helena
Mikrobiologický ústav, 2010

Litter decomposition in a primary succession chronosequence on brown coal mine deposits
Urbanová, Michaela; Valášková, Vendula; Šnajdr, Jaroslav; Baldrian, Petr
2009 - English
Litter decomposition in a primary succession chronosequence on brown coal mine deposits varies along with the successional age of the site Keywords: soil; enzyme; succesion; hnědé uhlí; půdy Available at various institutes of the ASCR
Litter decomposition in a primary succession chronosequence on brown coal mine deposits

Litter decomposition in a primary succession chronosequence on brown coal mine deposits varies along with the successional age of the site

Urbanová, Michaela; Valášková, Vendula; Šnajdr, Jaroslav; Baldrian, Petr
Mikrobiologický ústav, 2009

Charakterizace mikrobiálních populací v průběhu kompostování kontaminované půdy
Petránková, Mirka; Čechová, Zuzana; Brennerová, Mária; Cajthaml, Tomáš
2009 - Czech
Bioremediace je jedna z nejvýhodnějších metod pro dekontaminaci znečištěných půd. Její účinnost závisí na několika faktorech, nejvíce však na schopnosti bioremediačních organismů degradovat cílové polutanty, na fyzikálně-chemických vlastnostech polutantů (např. rozpustnost ve vodě) a na vlastnostech půdy. Kompostování se ukazuje jako vhodná technika pro remediaci půd kontaminovaných např. PAU. Proces je založen na schopnosti mikrorganismů degradovat organický materiál v závislosti na termogenezi. Teplota uvnitř kompostovací jednotky může dosáhnout až 75 stupňů C. Pro remediaci je kompostovací substrát jednoduše smíchán s částí kontaminované půdy Bioremediation is an indisputably advantageous approach to cleaning up contaminated soils. The efficiency of bioremediation depends on a number of factors, the most important of which are the ability of the bioremediative organism to degrade the target pollutants, the pollutant’s intrinsic properties (aqueous solubility being of key importance), and soil parameters. Composting has been recently shown to be efficient for remediation of soils contaminated e.g. with PAHs Keywords: Phospholipid fatty acids; biodegradation; composting; biodegradace Available at various institutes of the ASCR
Charakterizace mikrobiálních populací v průběhu kompostování kontaminované půdy

Bioremediace je jedna z nejvýhodnějších metod pro dekontaminaci znečištěných půd. Její účinnost závisí na několika faktorech, nejvíce však na schopnosti bioremediačních organismů degradovat cílové ...

Petránková, Mirka; Čechová, Zuzana; Brennerová, Mária; Cajthaml, Tomáš
Mikrobiologický ústav, 2009

About project

NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web

Send your suggestions and comments to nusl@techlib.cz

Provider

http://www.techlib.cz

Facebook

Other bases