21 research outputs found
Evaluation of contamination of cow milk with various conditionally pathogenic microflora for mastitis: genera Staphylococcus
The food safety issue of livestock products concerning insemination by opportunistic and accompanying microflora has attracted increasing attention from specialists. The ever-increasing trade and export of dairy and meat products from Ukraine to the EU countries requires constant monitoring of inoculation with mesophilic-aerobic and facultatively anaerobic microorganisms and psychrophilic microorganisms, in particular the genera Listeria and Yersinia, which survive and multiply at low temperatures and in salted and fermented products and pose a threat to human health. Milk and lactic acid products make up a significant part of the diet of a modern person. Therefore, constant control of raw materials from dairy enterprises for the production of milk and directly at enterprises for its processing is a guarantee of food safety. At the stage of milk production, due to violations of technological cycles of production (mastitis and contamination with antibiotics) and the spread of several diseases in Ukraine (paratuberculosis, tuberculosis, leptospirosis, brucellosis), milk from a herd of dairy cows poses a significant threat to human health due to the danger of mastitis milk and milk containing the causative agents of tuberculosis, brucellosis, leptospirosis, and recently there are more and more reports about the association of bovine paratuberculosis and human short bowel syndrome (Crohn's disease) mainly among the young population of Europe, which may be due to extreme variability and adaptive capacity mycobacteria
Small hive beetle (Aethina tumida) threat on the horizon
Beekeeping is an agricultural industry that deals with breeding bees, obtaining honey, wax, and other products. Bees are used for pollination of many types of crops to increase their harvest. Beekeeping products are also used in medicine, pharmacology, chemical, and food industries. One of the essential aspects of successful beekeeping development is ensuring sustainable epizootic well-being from infectious and invasive bee diseases in Ukraine. About 3 million bee colonies are owned by private farms and amateur beekeepers, which give approximately 50-60 thousand tons of commercial honey and 1.2–1.4 thousand tons of wax per year at the current stage of beekeeping development in Ukraine. Honey and bee products from Ukraine received 15 prestigious awards in various categories at the 77th National Honey Show, held in London among many countries in 2008. In recent years, there has been a constant increase in the threat of new little-known invasive and infectious diseases that pose a significant danger to beekeeping worldwide. The invasion of the small hive beetle Aethina tumida belongs to quarantine and hazardous invasive diseases, which have destroyed many bee colonies in several countries worldwide (USA, Canada, African countries, Australia, some European countries – Italy, and Portugal). There are no effective methods of preventing and controlling the small hive beetle. The only way to prevent the invasion of the small hive beetle in Ukraine is constant monitoring and control at the state border of the movement of bee packages and bee products, which may pose a threat to introducing this invasive species into Ukraine
Antibacterial and fungicidal activities of ethanol extracts of 38 species of plants
Galenic preparations are broadly used against microorganisms pathogenic to humans, thought their poteintial in this aspect is not studied completely. In our in vitro experiment we studied the influence of alcohol tinctures from 38 species of plants on 15 species of bacteria and one species of fungus. Zones of growth inhibition of colonies measuring over 8 mm were observed during the use of ethanol extracts of Maclura pomifera against eight species of microorganisms (Escherichia сoli, Proteus mirabilis, Serratia marcescens, Yersinia enterocolitica, Salmonella typhimurium, Rhodococcus equi, Campylobacter jejuni and Corynebacterium xerosis), Ginkgo biloba – against eight species (Enterococcus faecalis, S. marcescens, Y. enterocolitica, Klebsiella pneumoniae, Listeria іnnocua, L. monocytogenes, Р. аeruginosa and C. jejuni), Genista tinctoria – against seven species (E. coli, Enterobacter aerogenes, Proteus mirabilis, K. pneumoniae, S. typhimurium, Р. аeruginosa and Rh. equi), Phellodendron amurense – against seven species (E. faecalis, S. marcescens, S. typhimurium, Rh. equi, C. jejunі, C. xerosis and Candida albicans), Berberis vulgaris – against seven species (P. mirabilis, S. marcescens, K. pneumoniae, S. typhimurium, C. jejuni, Р. аeruginosa and C. xerosis), Vitex negundo – against six species (E. faecalis, E. coli, P. mirabilis, K. pneumoniae, S. typhimurium and Rh. equi), Koelreuteria paniculata – against six species (E. faecalis, P. mirabilis, S. marcescens, S. typhimurium, C. jejunі and E. coli), Magnolia kobus – against six species (E. faecalis, E. coli, P. mirabilis, S. marcescens, S. typhimurium, C. jejunі and C. xerosis), Liriodendron tulipifera – against six species (K. pneumoniae, Listeria іnnocua, Р. аeruginosa, C. jejuni, Rh. equi and C. albicans), Clematis flammula – against six species (E. faecalis, P. mirabilis, L. monocytogenes, Р. аeruginosa, C. jejuni and C. xerosis), Wisteria sinensis – against five species (E. coli, S. typhimurium, L. monocytogenes, Rh. equi and C. albicans), Chimonanthus praecox – against five species (E. faecalis, S. marcescens, L. monocytogenes, C. jejuni and Rh. equi), Colchicum autumnale – against five species (S. marcescens, K. pneumoniae, L. ivanovi, L. monocytogenes and Р. аeruginosa). As a result of the study, these plants were found to be the most promising for further study of in vivo antibacterial activity. In the search of antibacterial and antifungal activities, the following plants were observed to be less promising: Ailanthus altissima, Aristolochia manshuriensis, Artemisia absinthium, Callicarpa bodinieri, Campsis radicans, Catalpa duclouxii, Celastrus scandens, Dictamnus alba, Eucommia ulmoides, Geranium sanguineum, Laburnum anagyroides, Nepeta racemosa, Parthenocissus tricuspidata, Polygonatum multiflorum, Prunus dulcis, P. laurocerasus, Ptelea trifoliata, Pteridium aquilinum, Quercus castaneifolia, Q. petraea iberica, Salvia officinalis, Securigera varia, Styphnolobium japonicum, Tamarix elongata and Vitex agnus-castus
ТУБЕРКУЛОЦИДНА ТА ТУБЕРКУЛОСТАТИЧНА АКТИВНІСТЬ 1,2,4-ТРИАЗОЛЬНИХ ПОХІДНИХ IN VITRO (ВИЗНАЧЕННЯ МІК (МІНІМАЛЬНОЇ ІНГІБУЮЧОЇ КОНЦЕНТРАЦІЇ)
In recent years, the epizootic and epidemic situation of tuberculosis in animals and humans has worsened sharply in Ukraine. This is facilitated by the constant change in the morphology and biological properties of the causative agent of tuberculosis, the low efficiency of existing laboratory diagnostic methods (outdated bacteriology standards that do not meet European requirements), the emergence of multi-resistant strains of mycobacteria that are difficult to treat. Therefore, in recent decades, scientists of the world have been actively working on the creation of new chemotherapeutic agents with potential tuberculocidal and tuberculostatic activity.
In recent decades, cases of isolation of multi-resistant strains of mycobacteria have been increasingly recorded, causing infection that is difficult to treat, which poses a significant threat to the health of animals and people. The World Health Organization constantly monitors the situation of epidemic and socially significant diseases in the world. Particular attention is paid to tuberculosis. In the last decade, the WHO has developed and successfully applied the so-called DOTS strategy in the world. The essence of DOTS (Directly Observed Treatment Short-course) is strictly controlled treatment with a short course of chemotherapy. Therefore, the search for new chemotherapeutic drugs for the treatment of tuberculosis infection is a priority area of pharmaceutical chemistry.
One of the promising similar drugs are triazole derivatives, the active development of which continues at the department of natural sciences for foreign students and toxicological chemistry of the Zaporizhzhia State Medical University. Therefore, the direction of influence of these derivatives on epizootic strains of mycobacteria, the causative agents of animal tuberculosis, is promising. За останні роки в Україні різко погіршилася епізоотична та епідемічна ситуація з туберкульозу тварин та людей. Цьому сприяє постійна зміна морфології та біологічних властивостей збудника туберкульозу, низька ефективність існуючих методів лабораторної діагностики (застарілі стандарти бактеріології, які не відповідають європейським вимогам), поява мультирезистентних штамів мікобактерій, що важко піддаються лікуванню. Тому в останні десятиліття вченими світу ведеться активна робота по створенню нових хіміотерапевтичних засобів з потенційною туберкулоцидною та туберкулостатичною активністю.
За останні десятиліття все частіше фіксуються випадки виділення мультирезистентних штамів мікобактерій, спричинюють інфекцію, яка важко піддається лікуванню, що становить значну загрозу здоров’ю тварин та людей. Всесвітня організація охорони здоров'я постійно стежить за ситуацією за епідемічними та соціально значущим захворюванням у світі. Особливо пильна увага приділяється туберкульозу. В останнє десятиліття ВОЗ була розроблена та з успіхом застосовується в світі так звана стратегія DOTS. Суть DOTS (Directly Observed Treatment Shortcourse) - суворо контрольоване лікування коротким курсом хіміотерапії. Тому пошук нових хіміотерапевтичних препаратів для лікування туберкульозної інфекції є пріоритетним напрямком фармацевтичної хімії.
Одними із перспективних подібних препаратів є триазольні похідні активна розробка яких триває на кафедрі природничих дисциплін для іноземних студентів та токсикологічної хімії Запорізького державного медичного університету. Тому перспективним є напрямок впливу цих похідних на епізоотичні штами мікобактерій збудників туберкульозу тварин
Antimicrobial activity of 50 plant extracts
Antibacterial activity of plants is a subject of interest in the search for new antibiotics and fungicidal preparations. This article analyzes the effectiveness of the action of extracts of plants on microorganisms: six species of bacteria (Salmonella typhimurium, Listeria monocytogenes, Escherichia coli, Klebsiella pneumoniae, Corynebacterium xerosis, Proteus vulgaris) and one fungus (Candida albicans). For the assay, we used herbal material of 50 species (seeds, grass, shoots, leaves, compound fruit, peel) obtained at different periods of the growing season. We studied Levisticum officinale, Petroselinum crispum, Nerium oleander, Vinca minor, Eleutherococcus senticosus, E. sieboldianus, Yucca filamentosa, Artemisia annua, Echinacea purpurea, Matricaria recutita, Tanacetum vulgare, Betula pendula, Corylus avellana, Buxus sempervirens, Humulus lupulus, Crassula ovata, Bryophyllum daigremontianum, Juniperus communis, Platycladus orientalis, Cycas revoluta, Calluna vulgaris, Rhododendron ferrugineum, Ceratonia siliqua, Trigonella foenum-graecum, Ribes nigrum, Phellinus tuberculosus, Lavandula angustifolia, Melissa officinalis, Monarda fistulosa, Origanum vulgare, Salvia sclarea, Laurus nobilis, Punica granatum, Hibiscus rosa-sinensis, Menispermum dauricum, Ficus benjamina, Morus alba, Paeonia suffruticosa, Picea abies, Adonis vernalis, Amelanchier ovalis, Prunus armeniaca, Crataegus monogyna, Citrus sinensis, Salix babylonica, Bergenia crassifolia, Schisandra chinensis, Taxus baccata and Xanthoria parietina. The alcohol tincture was filtered with sterile multi-layer gauze disc filters. Before the discs were put on the surface of agar with inoculation of the corresponding culture, they were dried in a sterile laminar box under ultraviolet rays. Antibacterial activity of various tinctures was determined by the disk diffusion method in agar with the measurement of the diameter of the growth suppression zone of the culture using a template ruler. Maximum inhibiting effect was achieved for Punica granatum on K. рneumonia, L. monocytogenes, S. typhimurium, P. vulgaris, C. хerosis and E. сoli, Lavandula angustifolia – on P. vulgaris, K. рneumonia and S. typhimurium, Echinacea purpurea – on C. аlbicans, E. сoli, P. vulgaris, K. рneumonia, Bergenia crassifolia – on P. vulgaris, K. pneumonia and S. typhimurium
Bactericidal, protistocidal, nematodicidal properties and chemical composition of ethanol extract of Punica granatum peel
We have studied the chemical composition and antibacterial profile of ethanolic extract of Punica granatum L. (Lythraceae) on strains of microorganisms in vitro. Analysis using GC-MS showed 5-hydroxymethylfurfural (36.6%), D-sucrose (23.2%), sorbitol (6.7%), palmitic acid β-monoglyceride (5.6%), 2-furancarboxaldehyde (3.5%) and β-D-glucopyranose (3.3%) as the major components of the title extract. The experiment revealed a positive antibacterial effect of extracts obtained from P. granatum on 14 strains specifically Enterobacteriaceae microorganisms (Escherichia coli, Enterobacter aegorenеs, Proteus vulgaris, Serratia marcescens, Klebsiella pneumonia), Listeriaceae (Listeria ivanovi, L. іnnocua, L. monocytogenes) and yeasts from the family Saccharomycetaceae (Candida albicans). Our study showed that in many cases these extracts more intensively affect multi-resistant strains of microorganisms than macrolide antibiotic azithromycin and is therefore a source of molecules to be exploited in medicine or by the pharmaceutical industry. The investigated extracts of P. granatum can be recommended for further in-depth research against poly-resistant strains of the above-mentioned microorganisms. Effective drugs perform a leading role in providing stable veterinary well-being of livestock and healthcare of the population. The present study showed that the studied plant species more intensively affects multi-resistant strains of microorganisms than sodium salt of azithromycin. Lethal concentration (LC50) of ethanol extract from pomegranate for Paramecium caudatum Ehr. equaled 0.3%. Death of 100% of nematode larvae of Strongyloides papillosus (Ihle) was recorded during 24 h exposition in 20% extract of P. granatum peel
Analytical investigation of the operation of drilling machines with automatic feed by a bracket screw
The assembling scheme in S-matrix based full-wave electromagnetic modelling systems
The basic principles and object peculiarities that have to be taken into account at “electromagnetic assembling” of a complicated device by known S-matrices of key-elements are discussed. The detailed automatic consideration of plane symmetry of lines, plane junctions and tees, longitudinal symmetry of filters and dividers, uniformity of many waveguide elements along transversal axes, search of identical elements or their consequences together with the extraction the “variable” and “nonvariable” device parts makes possible to reduce the calculation times by orders. The usage of the proposed assembling schemes is extremely profitable at optimization problem solution for multiparametric couplers, diplexers and so on