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Tytuł:
Atrazine toxicity in marine algae Chlorella vulgaris, in E. coli lux and gfp biosensor tests
Toksyczność atrazyny w glonach Chlorella vulgaris oraz w biosensorowych testach E. coli z genami gfp i lux
Autorzy:
Matejczyk, Marzena
Kondzior, Paweł
Ofman, Piotr
Juszczuk-Kubiak, Edyta
Świsłocka, Renata
Łaska, Grażyna
Wiater, Józefa
Lewandowski, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/27311571.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ecotoxicology
atrazine
chlorella vulgaris
bioluminescent biosensors
water contamination
ekotoksykologia
atrazyna
czujniki bioluminescencji
zanieczyszczenie wody
Opis:
Atrazine (ATR) is a widely used chlorinated herbicide from the s-triazine group. Due to the widespread use of ATR, it leaks into the environment and is detected in drinking water, exceeding the WHO-acceptable concentration of atrazine in drinking water, which is 2 μg/L. The aim of our study was to determine toxicity, protein degradation and genotoxicity of ATR at concentrations of 10; 1; 0.1; 0.01 mg/L on Chlorella vulgaris and with the application of E. coli bioluminescent biosensor strains. We measured the content of chlorophyll a, b, carotenoids in Chlorella vulgaris and the inhibition of this algae culture growth. E. coli RFM443 strains with gene constructs grpE:luxCDABE, lac:luxCDABE, recA:luxCDABE and E. coli strain MM294 trc:luxCDABE were used to determine toxicity, degradation of cellular proteins and genotoxicity. On the base of the obtained results, we concluded that ATR in the tested concentrations shows a toxic effect in relation to Chlorella vulgaris. ATR is toxic and genotoxic in E. coli RFM443 strains with grpE, lac, recA promoters and causes degradation of cellular proteins. Moreover, we have detected ATR toxicity toward the GFP protein in E. coli strain MM294-GFP. Taking into account the toxicity and genotoxicity of ATR documented in our research and in the experiments of other authors, we conclude that the presence of this herbicide in surface waters and drinking water is a serious threat to living organisms.
Atrazyna (ATR) to szeroko stosowany na całym świecie chlorowany herbicyd z grupy s-triazyn. Ze względu na powszechne stosowanie, ATR przedostaje się do środowiska i jest wykrywana w wodzie pitnej, przekraczając dopuszczalne przez WHO stężenie, które wynosi 2 μg/L. W przedstawionych badaniach określono toksyczność ATR w stężeniach 10; 1; 0.1; 0.01 mg/L na glonach Chlorella vulgaris oraz z zastosowaniem E. coli mikrobiologicznych biosensorów z genami reporterowymi gfp i lux. Toksyczność oszacowano na podstawie zawartości chlorofilu a, b, karotenoidów w Chlorella vulgaris oraz zahamowania wzrostu tej kultury alg. Szczepy E. coli RFM443 z konstruktami genowymi grpE:luxCDABE, lac:luxCDABE, recA:luxCDABE i szczep E. coli MM294 trc:luxCDABE wykorzystano do określenia toksyczności, degradacji białek komórkowych i genotoksyczności. W przeprowadzonych badaniach wykryto, że ATR w analizowanych stężeniach wykazuje działanie toksyczne w stosunku do Chlorella vulgaris. W przypadku ATR stwierdzono właściwości toksyczne i genotoksyczne oraz potencjał degradacji białek w szczepach E. coli RFM443 z promotorami grpE, lac, recA. Ponadto wykryto toksyczność ATR w stosunku do białka GFP w szczepie E. coli MM294-GFP. Biorąc pod uwagę udokumentowaną w badaniach własnych oraz w doświadczeniach innych naukowców toksyczność i genotoksyczność ATR, obecność tego herbicydu w wodach powierzchniowych i wodzie pitnej stanowi poważne zagrożenie dla organizmów żywych.
Źródło:
Archives of Environmental Protection; 2023, 49, 3; 87--99
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression of the gene encoding blood coagulation factor VIII without domain B in E. coli bacterial expression system
Autorzy:
Mazurkiewicz-Pisarek, Anna
Mazurkiewicz, Alina
Mikiewicz, Diana
Baran, Piotr
Ciach, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/16706242.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
factor VIII
hemophilia type A
recombinant coagulation factor VIII
prokaryotic expression system
E. coli
recombinant protein production system
Opis:
In this article, we have demonstrated the feasibility of generating an active form of recombinant blood coagulation factor VIII using an E. coli bacterial expression system as a potential treatment for hemophilia type A. Factor VIII (FVIII), an essential blood coagulation protein, is a key component of the fluid phase blood coagulation system. So far, all available recombinant FVIII formulations have been produced using eukaryotic expression systems. Mammalian cells can produce catalytically active proteins with all the necessary posttranslational modifications. However, cultivating such cells is time-consuming and highly expensive, and the amount of the obtained product is usually low. In contrast to eukaryotic cells, bacterial culture is inexpensive and allows the acquisition of large quantities of recombinant proteins in a short time. With this study, we aimed to obtain recombinant blood coagulation factor VIII using the E. coli bacterial expression system, a method not previously explored for this purpose. Our research encompasses the synthesis of blood coagulation factor VIII and its expression in a prokaryotic system. To achieve this, we constructed a prokaryotic expression vector containing a synthetic factor VIII gene, which was then used for the transformation of an E. coli bacterial strain. The protein expression was confirmed by mass spectrometry, and we assessed the stability of the gene construct while determining the optimal growth conditions. The production of blood coagulation factor VIII by the E. coli bacterial strain was carried out on a quarter-technical scale. We established the conditions for isolation, denaturation, and renaturation of the protein, and subsequently confirmed the activity of FVIII.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 3; 247-262
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Salmonella spp. and Escherichia coli in the Snake-eyed lizard (Ophisops elegans) (Sauria, Lacertidae) in the Çankırı Province of Turkey
Autorzy:
Tarhane, S.
Bozkurt, E.
Büyük, F.
Powiązania:
https://bibliotekanauki.pl/articles/16647479.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
bacterial infection
PCR
reptilia
Turkey
Opis:
Zoonoses are frequently associated with wild animals. Research on reptiles either living in their natural habitat or kept as pet animals has shown that these animals frequently serve as the asymptomatic hosts of bacterial zoonotic agents, including Salmonella spp. and Escherichia coli. Studies have shown the potential of reptiles to transmit these pathogens to humans and other animals. Epidemiological research on the herpetofauna of various regions has demonstrated the high potential of reptiles as a reservoir of Salmonella spp. In the present study, Salmonella spp. were not isolated or identified from the snake-eyed lizard. Out of 150 cloacal swab samples of snake-eyed lizard 25 (16.7%) E. coli were isolated and out of these 4 (2.7%) were identified to be E. coli O157:H7 by PCR. The results suggest that Ophisops elegans could be involved in the transmission of E. coli, rather than Salmonella spp. This study demonstrates for the first time that the snake-eyed lizard acts as a cloacal carrier of E. coli O157:H7 and presents data that may aid in preventing the transmission of this strain to humans.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 1; 83-90
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloning of a Rift Valley Fever fusion gene in a plant virus derived replicon vector
Autorzy:
Omosimua, Rebecca Oziohu
Iyappan, Gowtham
Obembe, Olawole
Ogunkanmi, Adebayo
Sathishkumar, Ramalingam
Powiązania:
https://bibliotekanauki.pl/articles/1193478.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
DNA Cloning
Escherichia coli DH5α cells
PBYR2e3K2Mc-GFP
PBYR2e3K2Mc-RVFV
RVF disease
RVFV fusion gene
bean yellow dwarf derived vector
emerging disease
geminivirus vector
zoonotic disease
Opis:
Rift Valley fever (RVF) disease is an emerging viral zoonotic disease caused by Rift Valley fever virus (RVFV). RVF disease is seemingly becoming more severe in endemic populations and in areas of new outbreak. RVF disease is listed by WHO as requiring urgent research and development attention. There is no therapeutics or licensed vaccine for human use in the case of an eventual outbreak. There is a need to clone RVFV genes in cloning vectors which may be useful to produce antigens in plant cells or may be tested directly as DNA vaccines. A synthesized Rift Valley fever virus fusion gene was cloned in a bean yellow dwarf virus derived replicon vector; PBYR2e3K2Mc-GFP by removing and replacing the GFP gene. The cloned PBYR2e3K2Mc-RVFV fusion gene was confirmed by PCR, restriction digestion and DNA sequencing. This cloned RVFV fusion gene in plant virus vector can be used for subsequent protein expression in plants cells or used directly tested as DNA vaccines in future studies.
Źródło:
World Scientific News; 2021, 158; 159-172
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation of bacteria from soil sample of Tamil Nadu and their in vitro interaction
Autorzy:
Sankari, D.
Khusro, Ameer
Aarti, Chirom
Powiązania:
https://bibliotekanauki.pl/articles/1031683.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antagonism
B. subtilis
CFU
E. coli
Interaction
P. aeruginosa
Opis:
The present study was investigated to determine the competitive interaction between Gram positive (B. subtilis) and Gram negative (P. aeruginosa and E. coli) bacteria in vitro. Bacteria of interest were isolated from soil sample and were identified through morphological and biochemical tests. Bacterial cultures were grown alone and as co- culture in test tubes containing sterile broth. Bacterial growth and their growth inhibition in co- culture tubes were analyzed till 96 h through spectrophotometric assay and colony forming unit (CFU) assay. Spectrophotometric analysis and CFU/mL assay showed that the effect of B. subtilis on P. aeruginosa and E. coli in co- culture tubes was growth inhibitory. This is accompanied by the reduction in absorbance value and CFU/mL of the co-culture tubes. The bactericidal activity of B. subtilis was measured on P. aeruginosa and E. coli using agar well diffusion method. B. subtilis showed zone of inhibition of 8 mm and 6 mm against P. aeruginosa and E. coli, respectively. The antagonistic activity test of B. subtilis favoured the spectrophotometric and colony forming assay results. These results suggest that B. subtilis develop adaptational pathways by extracellular signaling molecules and antibacterial factors in order to compete with bacterial neighbors.
Źródło:
World News of Natural Sciences; 2020, 28; 67-75
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using multitype branching models to analyze bacterial pathogenicity
Autorzy:
Tahir, Daniah
Kaj, Ingemar
Bartoszek, Krzysztof
Majchrzak, Marta
Parniewski, Pawel
Sakowski, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/747904.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Markov models
branching processes
limit theorems
virulence factors
E. coli strains
Opis:
We apply multitype, continuous time, Markov branching models to study pathogenicity in E. coli, a bacterium belonging to the genus Escherichia. First, we examine briefly, the properties of multitype branching processes and we also survey some fundamental limit theorems regarding the behavior of such models under various conditions. These theorems are then applied to discrete, state dependent models, in order to analyze pathogenicity in a published clinical data set consisting of 251 strains of E. coli. We use well established methods, incorporating maximum likelihood techniques, to estimate speciation rates as well as the rates of transition between different states of the models. From the analysis, we not only derive new results, but we also verify some preexisting notions about virulent behavior in bacterial strains.
Źródło:
Mathematica Applicanda; 2020, 48
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibiotic Susceptibility Test of Bacteria Isolated From Fruit Juices Sold in Cafes and Restaurants of Debre-Markos Town, North Western Ethiopia
Autorzy:
Geta, Kindu
Kebede, Ameha
Chemedissa, Meseret
Powiązania:
https://bibliotekanauki.pl/articles/1076786.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antibiotics
Antimicrobial resistance
B. cereus
Debre Markos
E. coli
Enterobacter
Fruit juices
Klebsiella
Pathogens
Ps. aeruginosa
Salmonella
Shigella
Staphylococcus aureus
Opis:
The prevalence of antimicrobial resistance among food pathogens has increased during recent decades. In this work, pathogenic bacteria such as Staphylococcus aureus, Salmonella spp., Shigella spp., and E. coli were isolated following standard methods. The bacterial isolates were then tested for their sensitivity to common antibiotics using the disc diffusion method on Mueller-Hinton Agar. All of the pathogenic bacteria were found to be resistant to erythromycin and almost all were sensitive to penicillin.
Źródło:
World News of Natural Sciences; 2019, 24; 365-371
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel synthesis of 3-(((E)-benzylidene)amino)-5-((Z)-3,4-dimethoxybenzylidene)-2-phenyl-3,5-dihydro-4H-imidazol-4-one derivatives as potent antimicrobial agents
Autorzy:
Manawar, Rohit B.
Parmar, Mukesh B.
Nayaka, Indresh J.
Pandit, Brinda H.
Shah, Manish K.
Powiązania:
https://bibliotekanauki.pl/articles/1066261.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4H-imidazol-4-one
A. niger
Anti-fungal
Anti-microbial Agent
Bioactivity
C. albicans
E. coli
Elemental analysis
IR spectroscopy
Mass spectroscopy
NMR spectroscopy
P. aeruginosa
S. aureus
S. pyogenes
Opis:
Novel synthesis of 4H-imidazol-4-one derivative by reaction of (Z)-3-amino-5-(3,4 dimethoxybenzylidene)-2-phenyl-3,5-dihydro-4H-imidazol-4-one with derivative of different aromatic aldehydes and Salicyldehyde. New synthesized compound are thermally stable and neither air-nor moisture sensitive at RT. Successive library of synthesized compound characterized using IR, NMR, Elemental, Mass, and its antimicrobial activity study.
Źródło:
World Scientific News; 2019, 130; 42-70
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Garlic Extract Addition on Tilapia Skin Gelatin Based Edible Coating Towards Antimicrobial Properties and Fish Meatball’s Shelf Life
Autorzy:
Reynaldi, Ahmad
Rostini, Iis
Afrianto, Eddy
Rochima, Emma
Powiązania:
https://bibliotekanauki.pl/articles/1058047.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
E. coli
Pseudomonas aeruginosa
Salmonella typhimurium
Staphyllococcus aureus
TPC
edible coating
extract
garlic
pH values
shelf life
tilapia gelatin
Opis:
The purpose of this research is to determine the best concentration and effect of garlic extract incorporated on tilapia skin gelatin-based edible coating to preserve and extend the shelf life of fish meatball at cold storage. This research was conducted from May 2018 until October 2018 on Fisheries Product Processing Laboratory of The Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran. The garlic extract conducted with maceration method with ethanol 96% was performed at Organic Chemical Laboratory FMIPA Universitas Padjadjaran, and for TPC test, inhibition test of edible coating Tilapia’s fish-skin with garlic extract was conducted in Microbiology and Molecular Biotechnology Laboratory of Faculty of Fisheries and Marine Sciences Universitas Padjadjaran. The method used is experimental method with 5 treatments which is meatballs without edible coating. The addition of garlic extract was done with various concentration at 0%, 1%, 1.5%, 2%. The observations were Total Plate Count (TPC) test, inhibition zone test against Pseudomonas aeruginosa, and pH value. The results showed that the best treatment is 2% garlic extract with TPC value 1.1×105 cfu/g during 14 days of storage and concluded that it could extend the shelf life of meatball until 14 days, pH value was 7.03 and inhibition zone against P. aeruginosa was 7.01 mm. The addition of garlic extract on tilapia skin gelatin-based edible coating could extend the shelf life of fish meatballs until 14 days on cold storage.
Źródło:
World Scientific News; 2019, 134, 2; 74-85
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water quality and microbial contamination status of groundwater in Jaffna Peninsula, Sri Lanka
Jakość wody i mikrobiologiczne zanieczyszczenie wód gruntowych na półwyspie Jaffna na Sri Lance
Autorzy:
Mahagamage, M. G. Y. L.
Manage, Pavithrani S.
Manage, Pathmalal M.
Powiązania:
https://bibliotekanauki.pl/articles/292453.pdf
Data publikacji:
2019
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
coliform
E.coli
groundwater
Jaffna Peninsula
Salmonella spp.
Shigella spp
water quality
bakterie z grupy coli
Escherichia coli
jakość wody
półwysep Jaffna
Shigella spp.
wody gruntowe
Opis:
In Sri Lanka, among 2588 Salmonella positive cases, the highest incidences were recorded from Jaffna peninsula during 2005 to 2013. Therefore, the present study aimed to identify the microbiological and chemical contamination status of groundwater (40 well water) sources in Jaffna during November 2016. The total coliform, E. coli, Salmonella spp. and Shigella spp. along with some physico-chemical parameters of groundwater were studied. The results revealed that entire peninsula was contaminated with total coliform and E. coli bacteria and the parameters recorded were not within the WHO and SLS (Sri Lanka Standards) drinking water quality standards. 38% of sampling locations were positive for Salmonella spp. and among them six sampling locations were being used for drinking purposes. The results of the study correlates with the statistics of typhoid cases recorded in Jaffna. Results of the study also revealed that around 80% of wells were not within the values specified in guidelines of the SLS for drinking water quality on electrical conductivity. Further, 15% of wells recorded greater than 10 mg∙dm–3 nitrate, which is still below the SLS drinking water standards (45 mg∙dm–3). According to the water quality data, PCA analysis showed that Jaffna town, Nallur, Tellippalai and Kopay DS divisions has similar characteristics for water quality.
Spośród 2588 przypadków zatrucia salmonellą zanotowanych na Sri Lance największą liczbę zachorowań stwierdzono na półwyspie Jaffna w latach 2005–2013. Dlatego prezentowane badania miały na celu identyfikację chemicznego i mikrobiologicznego zanieczyszczenia wód gruntowych z 40 studni w listopadzie 2016 r. Analizowano całkowitą liczbę bakterii z grupy coli, Escherichia coli, Salmonella spp., Shigella spp. oraz wybrane parametry fizyczne i chemiczne wód gruntowych. Wyniki ujawniły, że cały półwysep jest skażony bakteriami z grupy coli i bakterią Escherichia coli, a analizowane parametry nie spełniają standardów WHO i standardów Sri Lanki co do jakości wody. W 38% badanych stanowisk stwierdzono obecność Salmonella spp., przy czym sześć z nich wykorzystywano jako źródła wody pitnej. Wyniki badań korelowały z rejestrowanymi przypadkami duru brzusznego na półwyspie. Stwierdzono także, że 80% studni nie spełniało wymogów stawianych wodzie pitnej przez normy Sri Lanki w odniesieniu do przewodnictwa elektrolitycznego. Ponadto stężenie azotanów w 15% studni było większe niż 10 mg∙dm–3, ale nie przekraczało granicznej wartości 45 mg∙dm–3 wyznaczonej przez normy dla wody pitnej. Analiza PCA wykazała, że miasto Jaffna oraz gminy Nallur, Tellippalai i Kopay mają wody o podobnych właściwościach.
Źródło:
Journal of Water and Land Development; 2019, 40; 3-12
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloning, purification and enzymatic characterization of recombinant human superoxide dismutase 1 (hSOD1) expressed in Escherichia coli
Autorzy:
Lin, Feng
Yan, Dandan
Chen, Yawen
E, Fletcher
Shi, Haifeng
Han, Bangxing
Zhou, Yang
Powiązania:
https://bibliotekanauki.pl/articles/1038395.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
superoxide dismutase 1
Escherichia coli
soluble expression
metal ions
catalytic activity
Opis:
Superoxide dismutase 1 (SOD1) is a metalloenzyme that catalyzes the disproportionation of superoxide into molecular oxygen and hydrogen peroxide. In this study, the human SOD1 (hSOD1) gene was cloned, expressed and purified. The hSOD1 gene was amplified from a pool of Bxpc3 cell cDNAs by PCR and cloned into expression vector pET-28a (+). The recombinant soluble hSOD1 was expressed in E. coli BL21 (DE3) at 37°C and purified using nickel column affinity chromatography. Soluble hSOD1 was produced with a yield of 5.9 μg/mL medium. As metal ions can have a certain influence on protein structure and activity, we researched the influences of different concentrations of Cu2+ and Zn2+ on hSOD1 activity at induction and the time of activity detection. The results implied that Cu2+ and Zn2+ do not enhance SOD1 expression and solubility; they can, however, improve the catalytic activity at induction. Meanwhile, Cu2+ and Zn2+ also enhanced the enzyme activity at the time of detection. Furthermore, most other bivalent cations had the potential to replace Zn2+ and Cu2+, and also improved enzyme activity at the time of detection.
Źródło:
Acta Biochimica Polonica; 2018, 65, 2; 235-240
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COMPARATIVE IN VITRO STUDIES OF FURAZIDIN AND NITROFURANTOIN ACTIVITIES AGAINST COMMON UROPATHOGENS INCLUDING MULTIDRUG-RESISTANT STRAINS OF E. COLI AND S. AUREUS
Autorzy:
Klesiewicz, Karolina
Karczewska, Elżbieta
Nowak, Paweł
Mrowiec, Paulina M.
Skiba-Kurek, Iwona
Białecka, Joanna
Majka, Zbigniew
Berdzik-Kalarus, Sylwia
Budak, Alicja
Zajdel, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/895689.pdf
Data publikacji:
2018-06-30
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
ESBL-positive E. coli
MRSA
furazidin
nitrofurantoin
urinary tract infections
Opis:
Abstract: Urinary tract infections caused by wide range of pathogens including gram-negative and gram-positive bacteria as well as fungi are a severe public health problem. The predominant causative agent of both uncomplicated and complicated urinary tract infections is Escherichia coli. In an era of increasing bacterial resistance to antimicrobial agents and a high prevalence of multidrug-resistant (MDR) strains in community and hospital acquired infections, the re-evaluation of older generations of antimicrobial agents, such as nitrofuran derivatives, seems to be a reasonable approach. The aim of the study was to evaluate furazidin activity against common uropathogens in comparison to nitrofurantoin and other selected antimicrobial agents, routinely used in the treatment of urinary tract infections. Furazidin exhibited lower MICs than nitrofurantoin when tested against gram-negative and gram-positive bacteria including clinical MDR E. coli and methicillin-resistant Staphylococcus aureus. The MICs for furazidin ranged from 4 to 64 mg/L for Enterobacteriaceae strains, from 2 to 4 mg/L for gram-positive cocci, and 0.5 mg/L for anaerobic bacteria. The MICs for nitrofurantoin ranged from 16 to 64 mg/L for Enterobacteriaceae strains, from 8 to 64 mg/L for gram-positive cocci, and 4 mg/L for anaerobic bacteria. In addition, both nitrofurans displayed better activity against the tested bacterial strains than ciprofloxacin, fosfomycin, trimethoprim and co-trimoxazole. Nitrofuran derivatives displayed higher antimicrobial activity than other antimicrobial agents regardless of bacteria species or resistance mechanism.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 3
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Escherichia Coli-Lux Biosensor Used to Monitor the Cytotoxicity and Genotoxicity of Pharmacological Residues in Environment
Autorzy:
Hawrylik, E.
Matejczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/124989.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bacterial biosensors
reporter gene lux
β-blockers
cytotoxicity
genotoxicity
Opis:
The aim of the study was to evaluate the usefulness of Escherichia coli K-12 RFM 443 recA::lux for cytotoxicity and genotoxicity monitoring of metoprolol in the environment. Metoprolol is one of the most popular cardiac drug which belongs to the group of β-blockers. The drug was applied at the concentrations ranging from 0.01 μg/cm3 to 100 μg/cm3. The conducted research constitutes preliminary study aimed at validation of the recA::lux gene construct in order to determine its sensitivity to metoprolol. The drug concentrations were selected experimentally to obtain a positive luminescence response. The obtained data indicated the influence of metoprolol on lux gene expression and recA promoter activity based on the application of laboratory samples using PBS buffer. The results indicate a potential for using a bacterial biosensor Escherichia coli K-12 RFM 443 with recA::lux gene fusion in cytotoxicity and genotoxicity monitoring of the cardiac drugs residue in the environment.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 11-17
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plant-derived rhamnogalacturonan-I’s modulate proinflammatory cytokine gene expression in neutrophils stimulated by E. coli LPS and P. gingivalis bacteria
Autorzy:
Folkert, J.
Mieszkowska, A.
Burke, B.
Addison, O.
Gurzawska, K.
Powiązania:
https://bibliotekanauki.pl/articles/285453.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
pectin
PMN
proinflammatory cytokines
gene expression
Opis:
Titanium dental implants often induce the foreign body immune response. The duration of the inflammatory process determines the initial stability and biocompatibility of the implant. The challenge for bone tissue engineering is to develop implant biocompatible and bioactive surface coatings that regulate the inflammatory response and enhance osseointegration. Pectins, plant-derived polysaccharides, have been shown to be potential candidates for surface coating due to their possible roles in improving osseointegration and bone healing. The aim of this study was to evaluate in vitro the effect of plant-derived pectin rhamnogalacturonan-I (RG-I) nanocoating on pro- and anti-inflammatory human polymorphonuclear leucocytes (PMN) responses to E. coli LPS or P. gingivalis bacteria. In this study unmodified RG-I and structurally modified RG-I from potato were examined. All in vitro studies were performed on tissue culture polystyrene surfaces (TCPS) or titanium (Ti) discs coated with unmodified and modified RG-Is. Changes in PMN gene expression occurred on both surfaces. The presence of RG-Is down-regulated proinflammatory genes, IL1B, IL8, TNFA. Our results clearly showed that pectin RG-I nanocoating decreased the level of proinflammatory genes expression in stimulated PMN and may therefore be considered as a potential candidate for modulation of the inflammatory response elicited by insertion of implants into living tissue.
Źródło:
Engineering of Biomaterials; 2018, 21, 144; 2-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Screening for ESβL producing E. coli isolated from clinical urine samples collected from different places of Kalaburagi city
Autorzy:
Ramachar, Raghavendra
Gaddad, Subhashchandra M.
Shivannavar, Channappa T.
Powiązania:
https://bibliotekanauki.pl/articles/1177430.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antibiogram
Double-disc diffusion test
ESβL
Green Metallic Sheen
Phenotypic detection
Uropathogenic E. coli
Opis:
Bacteria are capable of invading and infecting humans, leading to disease and sometimes death. Different body tissues, organs and systems are vulnerable to different organisms. This study was aimed to isolate and identify the bacteria causing Urinary Tract Infection (UTI) in different age groups and also screened for ESβL production. The mid-stream urine samples showing symptoms of urinary tract infections were collected in a wide container from different hospitals and diagnostic centres of Kalaburagi city. The isolation of uropathogen was done by semi-quantitative method of inoculating the samples on the selective and differential media such as Eosin Methylene Blue (EMB) and MacConkey (MAC) agar media respectively. The isolated pathogen was identified by conventional methods like cultural, morphological and biochemical tests. The antibiotic susceptibility test was carried out by Kirby-Bauer disc diffusion technique and ESβL production by double disk-diffusion test (DDDT) as per CLSI guidelines (2013). Out of 550 samples screened, a total of 288 bacteria were isolated of those half of them (146) were E. coli isolates and all were found to be multidrug resistant and half of them (50%) were of ESβL producers. All ESβL producing E. coli isolates were resistant to ceftazidime and exhibited higher level of resistance to Cephalothin, Erythromycin, Cotrimoxazole and Aztreonam. As ESβL producing organisms limits the available treatment options, so, the timely administration of sensitive antibiotic and avoiding antibiotic abuse will help in curing the disease without going for the costly drugs such as Carbapenems. Our study revealed that nitrofurantoin, ofloxacin and cefoxitin may be considered as drug of choice for the treatment of UTI patients. The ESβL production in uropathogens should be continuously monitored in the clinics and hospitals as to avoid the emergence of more multi drug resistance strains.
Źródło:
World Scientific News; 2018, 103; 107-118
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł

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