scholarly journals Thermo-Oxidative Destruction and Biodegradation of Nanomaterials from Composites of Poly(3-hydroxybutyrate) and Chitosan

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3528
Author(s):  
Anatoly A. Olkhov ◽  
Elena E. Mastalygina ◽  
Vasily A. Ovchinnikov ◽  
Tatiana V. Monakhova ◽  
Alexandre A. Vetcher ◽  
...  
Keyword(s):  
Antimicrobial Properties ◽  
The Other ◽  
Large Specific Surface Area ◽  
Fibrous Materials ◽  
Biological Degradation ◽  
Oxidative Destruction ◽  
Heterophase System ◽  
Accelerated Oxidation ◽  
Structure Sensitive ◽  
Biodegradation Process

A complex of structure-sensitive methods of morphology analysis was applied to study film materials obtained from blends of poly(3-hydroxybutyrate) (PHB) and chitosan (CHT) by pouring from a solution, and nonwoven fibrous materials obtained by the method of electrospinning (ES). It was found that with the addition of CHT to PHB, a heterophase system with a nonequilibrium stressed structure at the interface was formed. This system, if undergone accelerated oxidation and hydrolysis, contributed to the intensification of the growth of microorganisms. On the other hand, the antimicrobial properties of CHT led to inhibition of the biodegradation process. Nonwoven nanofiber materials, since having a large specific surface area of contact with an aggressive agent, demonstrated an increased ability to be thermo-oxidative and for biological degradation in comparison with film materials.

Disinfection of Fruits with Activated Water

2019 ◽  
Vol 10 ◽  
pp. 1864-1872
Author(s):  
Prof. Teodora P. Popova
Keyword(s):  
Antimicrobial Activity ◽  
Aqueous Solutions ◽  
Antimicrobial Properties ◽  
The Other ◽  
Gram Negative Bacteria ◽  
High Antimicrobial Activity ◽  
Gram Negative ◽  
E Coli ◽  
Number Of Microorganisms ◽  
Lower Effect

The effect of ionized aqueous solutions (anolytes and catholyte) in the processing of fruits (cherries, morellos, and strawberries) for decontamination has been tested. Freshly prepared analytes and catholyte without the addition of salts were used, as well as stored for 7 months anolytes, prepared with 0.5% NaCl and a combination of 0.5% NaCl and 0.5% Na2CO3. The anolyte prepared with a combination of 0.5% NaCl and 0.5% Na2CO3, as well as the anolyte obtained with 0.5% NaCl, exhibit high antimicrobial activity against the surface microflora of strawberries, cherries, and sour cherries. They inactivate E. coli for 15 minutes. The other species of the fam. Enterobacteriaceae were also affected to the maximum extent, as is the total number of microorganisms, especially in cherries and sour cherries. Even stored for 7 months, they largely retain their antimicrobial properties. Anolyte and catholyte, obtained without the addition of salts, showed a lower effect on the total number of microorganisms, but had a significant effect on Gram-negative bacteria, and especially with regard to the sanitary indicative E. coli.

scholarly journals Gold Nanoparticles Synthesis and Antimicrobial Effect on Fibrous Materials

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1067
Author(s):  
Behnaz Mehravani ◽  
Ana Isabel Ribeiro ◽  
Andrea Zille
Keyword(s):  
Gold Nanoparticles ◽  
Antimicrobial Properties ◽  
Antimicrobial Effect ◽  
Environmental Concerns ◽  
Fibrous Materials ◽  
Barrier Material ◽  
Future Studies ◽  
Textile Materials ◽  
Promising Strategy ◽  
Antimicrobial Materials

Depositing nanoparticles in textiles have been a promising strategy to achieve multifunctional materials. Particularly, antimicrobial properties are highly valuable due to the emergence of new pathogens and the spread of existing ones. Several methods have been used to functionalize textile materials with gold nanoparticles (AuNPs). Therefore, this review highlighted the most used methods for AuNPs preparation and the current studies on the topic in order to obtain AuNPs with suitable properties for antimicrobial applications and minimize the environmental concerns in their production. Reporting the detailed information on the functionalization of fabrics, yarns, and fibers with AuNPs by different methods to improve the antimicrobial properties was the central objective. The studies combining AuNPs and textile materials have opened valuable opportunities to develop antimicrobial materials for health and hygiene products, as infection control and barrier material, with improved properties. Future studies are needed to amplify the antimicrobial effect of AuNPs onto textiles and minimize the concerns related to the synthesis.

Behavior of Pyrazon in Soil

Weed Science ◽  
1969 ◽  
Vol 17 (3) ◽  
pp. 323-326 ◽  
Author(s):  
R. Frank ◽  
C. M. Switzer
Keyword(s):  
Exponential Function ◽  
Soil Microorganisms ◽  
Time Characteristic ◽  
The Other ◽  
Biological Degradation ◽  
Other Hand ◽  
Chemical Determination

The disappearance of 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone (pyrazon) from soil was studied using Brassica species for bioassay and the spectrophotometer and chromogenic reagents for chemical determination. Loss of pyrazon from soil appeared to be an exponential function of time characteristic of the activity of soil microorganisms. On the other hand, non-biological degradation appeared negligible. Leaching of pyrazon appeared to be insignificant or minor. The greater part of the herbicide remained in the top 3 inches of soil.

scholarly journals Cause of rapid monochloramine decay observed in treated water

2016 ◽  
Vol 17 (3) ◽  
pp. 752-758 ◽  
Author(s):  
Sam Hancock ◽  
Martin Harris ◽  
David Cook
Keyword(s):  
Water Treatment ◽  
Water Samples ◽  
Pilot Scale ◽  
The Other ◽  
Biological Degradation ◽  
Filter Media ◽  
Rapid Decay ◽  
Treated Water ◽  
Water Treatment Plants ◽  
The Impact

Rapid monochloramine decay has been observed in the product water of three River Murray water treatment plants (WTPs). Previous investigations identified that rapid monochloramine decay was microbiological in nature and observed in samples taken after media filtration but was absent in filtered water samples from a fourth WTP of similar design. The filters at the WTP not exhibiting rapid decay are backwashed with filtered non-disinfected water whereas the other WTPs backwash with treated chloraminated water. It was therefore hypothesised that backwashing filters with chloraminated water was the cause of the rapid monochloramine decay. A pilot-scale study was conducted to investigate the impact of backwashing with chloraminated water on the occurrence of microbiologically accelerated monochloramine decay. Additional samples were analysed to assess the impact of chloraminated backwash water on N-Nitrosodimethylamine (NDMA) formation and biological degradation of taste and odour compounds 2-methyl isoborneol (MIB) and geosmin in the filter media. Backwashing with chloraminated filtered water was concluded to be the cause of the observed rapid monochloramine decay, with rapid decay observed within 8 weeks for the filters backwashing with chloramines. Additionally, backwashing with chloraminated filtered water was observed to increase NDMA formation and impair the biological degradation performance of MIB and geosmin.

scholarly journals Testing the Antimicrobial Characteristics of Wood Materials: A Review of Methods

Antibiotics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 225 ◽  
Author(s):  
Muhammad Tanveer Munir ◽  
Hélène Pailhories ◽  
Matthieu Eveillard ◽  
Mark Irle ◽  
Florence Aviat ◽  
...  
Keyword(s):  
Wood Species ◽  
Antimicrobial Properties ◽  
The Other ◽  
Future Research ◽  
Knowledge Gaps ◽  
Wood Material ◽  
Antimicrobial Potential ◽  
Microbial Survival ◽  
Bacteria And Fungi ◽  
Inert Surfaces

Some wood species have antimicrobial properties, making them a better choice over inert surfaces in certain circumstances. However, the organic and porous nature of wood raises questions regarding the use of this material in hygienically important places. Therefore, it is reasonable to investigate the microbial survival and the antimicrobial potential of wood via a variety of methods. Based on the available literature, this review classifies previously used methods into two broad categories: one category tests wood material by direct bacterial contact, and the other tests the action of molecules previously extracted from wood on bacteria and fungi. This article discusses the suitability of these methods to wood materials and exposes knowledge gaps that can be used to guide future research. This information is intended to help the researchers and field experts to select suitable methods for testing the hygienic safety and antimicrobial properties of wood materials.

scholarly journals Enhanced bioremediation of diesel oil contaminated soil and wastewaters by hydrocarbonsdegrading bacteria

2019 ◽  
pp. 239-246
Author(s):  
B. Kolwzan ◽  
K. Piekarska ◽  
J. Kiernicka ◽  
E. Sliwka
Keyword(s):  
Activated Sludge ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Biological Treatment ◽  
Diesel Oil ◽  
The Other ◽  
Other Hand ◽  
Biodegradation Process ◽  
Enhanced Bioremediation

Strains of microorganisms actively degrading diesel oil were used as inoculants in the process of biological treatment of contaminated soils and wastewaters. The study showed that bioremediation was faster in inoculated lysimeters compared to control lysimeters. On the other hand inoculation of activated sludge with active microorganisms increased the efficiency of bioremediation of oil containing wastewaters of about 19.2%. The bioindication study showed that no harmful metabolites were produced during the biodegradation process.

scholarly journals Structure-sensitive testimonial norms

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Benedikt T. A. Höltgen
Keyword(s):  
Network Structure ◽  
The Other ◽  
Local Network ◽  
The Novel ◽  
Scientific Communities ◽  
Agent Based ◽  
Structure Sensitive ◽  
Conventional Structure ◽  
The One ◽  
Size And Structure

AbstractAlthough there has been a lot of investigation into the influence of the network structure of scientific communities on the one hand and into testimonial norms (TNs) on the other, a discussion of TNs that take the network structure into account has been lacking. In this paper, I introduce two TNs which are sensitive to the local network structure. According to these norms, scientists should give less weight to the results of well-connected colleagues, as compared to less connected ones. I employ an Agent Based Model to test the reliability of the two novel TNs against different versions of conventional, structure-insensitive TNs in networks of varying size and structure. The results of the simulations show that the novel TNs are more reliable. This suggests that it would be beneficial for scientific communities if their members followed such norms. For individual scientists, I show that there are both reasons for and reasons against adopting them.

scholarly journals Medicinal Properties of Phytochemicals and their Production

2021 ◽  
Author(s):  
Aanchal Bansal ◽  
Chinmayee Priyadarsini
Keyword(s):  
Tissue Culture ◽  
Medicinal Plants ◽  
Antimicrobial Properties ◽  
The Other ◽  
In Vitro Production ◽  
Indigenous Plants ◽  
The World ◽  
Medicinal Properties ◽  
Vitro Production

Phytochemicals are produced by plants as a defence mechanism against pathogens. They are used to treat various metabolic, immunological and neurological disorders in humans in various parts of the world as a part of traditional medicine. The use of indigenous plants in commercial medicine is rising with increasing population. The antimicrobial properties of plant extracts led to increased demands. Plant tissue culture on the other hand, has proved to be a reliable alternative for the production of bioactive compounds from plants. Artificial plant culture can enhance the production of phytochemicals in medicinal plants. This review focuses on the medicinal properties of phytochemicals and their in-vitro production.

scholarly journals Influence of selected storage temperatures on wood properties and its biological resistance after the use of methylxanthines

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6231-6243
Author(s):  
Klára Kobetičová ◽  
Martin Böhm ◽  
Jana Nábělková ◽  
Robert Černý
Keyword(s):  
Uv Radiation ◽  
Weather Conditions ◽  
Wood Properties ◽  
The Other ◽  
Effect Of Temperature ◽  
Biological Degradation ◽  
Stable Temperature ◽  
Biological Attack ◽  
Effects Of Temperature ◽  
Storage Temperatures

Methylxanthine’s fungicidal properties were investigated, with attention to the temperature of treatment. Caffeine and theophylline treatments of beech and spruce woods were applied for three months in the temperature range of -20 to 40 °C, simulating potential weather conditions in the European region and temperatures specific for various wood applications (cellars, wine cellars, room indoor temperatures, interior trusses). Effects of the selected temperatures were considered without the influence of the other possible factors, which have been considered in previous studies (e.g. effects of temperature in combination with other factors such as UV radiation, humidity, and chemical or biological degradation). Then, the specimens were exposed to a mix of molds and fungi for three months under controlled laboratory conditions in order to analyze a possible subsequent biological attack. The results did not show any effect of temperature of the methylxanthine treatment within the studied range on the organismal activity. Caffeine exhibited a better protective potential than theophylline and was more effective for spruce than for beech. The results indicated the suitability of caffeine for protection of spruce and spruce-based materials in interior applications at a stable temperature without significant effects of UV and humidity.

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