scholarly journals Biomedical Applications Of Novel Green Biomaterial Synthesized From Endophytic Bacteria Cronobacter Sakazakii

2021 ◽  
Author(s):  
Love Edet M ◽  
Hemalatha S
Keyword(s):  
Biofilm Formation ◽  
Endophytic Bacteria ◽  
Biomedical Applications ◽  
Antibacterial Effect ◽  
Gram Negative Bacteria ◽  
Drug Resistant ◽  
Cronobacter Sakazakii ◽  
Isolation And Identification ◽  
E Coli ◽  
Uv Visible

Abstract Endophytic bacteria from the flower of Nyctanthes arbor-tristis was isolated and identified as Cronobacter sakazakii. The supernatant of the biomass of this endophyte was utilized for biomaterial synthesis which was confirmed by a change in colour and characterized by using UV-Visible spectrophotometer, FTIR, FESEM, EDAX, Zeta potential and DLS. The antibacterial efficacy of the biomaterial against Gram positive and Gram negative bacteria was determined via agar well diffusion, MIC, MBC and biofilm formation assays. The antioxidant and anti-arthritic assays were also performed. The result reveals antibacterial effect of biomaterial against the multi-drug-resistant E. coli, S. aureus and K. pneumonia strains. This report is the first to reveal the isolation and identification of endophytic bacteria from the flower of Nyctanthes arbor-tristis, alongside its biomaterial synthesis, characterization and biomedical applications. Our result implies that the synthesized biomaterial can be utilized as an effective antimicrobial, antioxidant and anti-arthritic agent and can be incorporated in pharmaceutical formulation for drug development.

scholarly journals Isolation and Identification of Uropathogenic E. coli and its Antimicrobial Susceptibility Pattern with Special Reference to Extended Spectrum Beta-Lactamases (Esbl)

2021 ◽  
pp. 56-67
Author(s):  
V. Naveen Kumar ◽  
Chitralekha Saikumar
Keyword(s):  
Urinary Tract ◽  
Special Reference ◽  
Management Plan ◽  
Gram Negative Bacteria ◽  
Susceptibility Pattern ◽  
Isolation And Identification ◽  
Gram Negative ◽  
Microbial Resistance ◽  
E Coli ◽  
Tract Infections

Urinary tract infections (UTI) are the most common bacterial infection among the humans. One of the most important factors impacting the management of UTI over the past decade is emergence of anti-microbial resistance among uropathogens. ESBL production is one of the most common mechanisms of anti-microbial resistance, the other being Amp C β-lactamases in gram negative bacteria. This study was undertaken to establish the prevalence of ESBL producing strains and their anti-microbial susceptibility pattern to newer agents to guide therapy for urinary tract infection. The present studies isolates and identify Uropathogenic Escherichia coli and its antibiotic susceptibility pattern with special reference to ESBL. The emergence of β-lactamase is a Metter of serious concern .The drug resistance in gram negative bacilli is due to production of β-lactamases, AmpC lactamases, Efflux mechanisms and Porin deficiency. Out of the total 3580 urine samples, 987 samples (27.56%) showed No growth, 1786 (49.88%) showed the presence of Gram negative bacteria. Totally, 1081 E. coli species were isolated and < 30% of them were found to be ESBL positive. Uropathogenic E. coli   isolates are highly susceptible towards Meropenem and Imipenem antibiotics and highly resistant towards β-lactam and Cephalosporins antibiotics. Hence, the present study urged to implement the management plan for using those antibiotics in patients for preventing the antibiotic resistance.

scholarly journals ISOLATION AND IDENTIFICATION OF MICROFLORA FROM APPARENTLY HEALTHY CAGED PARROTS OF DHAKA ZOO OF BANGLADESH

1970 ◽  
Vol 8 (1) ◽  
pp. 05-10 ◽  
Author(s):  
J Akhter ◽  
MT Hossain ◽  
MT Islam ◽  
MP Siddique ◽  
MA Islam
Keyword(s):  
Research Work ◽  
Antibiotic Sensitivity ◽  
Biochemical Properties ◽  
Gram Negative Bacteria ◽  
Bacterial Isolates ◽  
Salmonella Spp ◽  
Isolation And Identification ◽  
Gram Negative ◽  
E Coli ◽  
Apparently Healthy

The research work was conducted to isolate and identify the microflora from apparently healthy caged parrots. A total of 45 samples (oral swabs, cloacal swabs and feces) were collected from five types of caged parrots (Gray cockatiels, Rose ringed parakeet, Alexandriane parakeet, Red breast parakeet and Blossom headed parakeet) of Dhaka Zoo during the period from April to August 2009. The samples were cultured on different bacteriological media and the bacteria were identified by their cultural and biochemical properties. All the isolates were allowed for antibiogram study. The bacteria isolated in this study from different types of caged parrots were E. coli (64.44%), Salmonella spp. (46.67%), Staphylococcus spp. (46.67%), Pasteurella spp. (33.33%), Proteus spp. (6.67%) and some unidentified Gram-positive and Gram-negative bacteria. Of these isolates, E. coli was the most frequent isolate. The frequency of Gram-negative bacteria was higher in this study. The percentage of bacterial isolates recovered from each type of parrots was almost similar. Irrespective of types of parrots, the higher percentage of different bacteria was isolated from cloacal swab (77.78%) followed by feces (75.56%). The 68.89% isolates were recovered from oral swab. All the suspected isolates of Salmonella spp. were confirmed by slide agglutination test using Salmonella polyvalent ‘O’ antiserum. Among the 21 Salmonella spp. isolated in this study, 4 (19.05%) isolates were identified as S. Pullorum when tested with specific antisera against S. Pullorum. The results of antibiotic sensitivity tests revealed that ampicillin and amoxicillin were completely resistant to E. coli and Pasteurella spp.; ampicillin to Proteus spp.; and furazolidone to Salmonella spp. and Pasteurella spp. However, the antibiotics of fluoroquinolone group such as ciprofloxacin, norfloxacin and enrofloxacin showed moderate to high sensitivity against almost all the bacterial isolates. Of these, ciprofloxacin was found to be consistently highly sensitive to all the bacterial isolates. DOI = 10.3329/bjvm.v8i1.8349 Bangl. J. Vet. Med. (2010). 8(1): 05-10

Escherichia coli tol and rcs genes participate in the complex network affecting curli synthesis

Microbiology ◽  
2005 ◽  
Vol 151 (7) ◽  
pp. 2487-2497 ◽  
Author(s):  
Anne Vianney ◽  
Grégory Jubelin ◽  
Sophie Renault ◽  
Corine Dorel ◽  
Philippe Lejeune ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Biofilm Formation ◽  
Membrane Integrity ◽  
Regulatory Proteins ◽  
Gram Negative Bacteria ◽  
Dependent Manner ◽  
Dominant Effect ◽  
Gram Negative ◽  
E Coli

Curli are necessary for the adherence of Escherichia coli to surfaces, and to each other, during biofilm formation, and the csgBA and csgDEFG operons are both required for their synthesis. A recent survey of gene expression in Pseudomonas aeruginosa biofilms has identified tolA as a gene activated in biofilms. The tol genes play a fundamental role in maintaining the outer-membrane integrity of Gram-negative bacteria. RcsC, the sensor of the RcsBCD phosphorelay, is involved, together with RcsA, in colanic acid capsule synthesis, and also modulates the expression of tolQRA and csgDEFG. In addition, the RcsBCD phosphorelay is activated in tol mutants or when Tol proteins are overexpressed. These results led the authors to investigate the role of the tol genes in biofilm formation in laboratory and clinical isolates of E. coli. It was shown that the adherence of cells was lowered in the tol mutants. This could be the result of a drastic decrease in the expression of the csgBA operon, even though the expression of csgDEFG was slightly increased under such conditions. It was also shown that the Rcs system negatively controls the expression of the two csg operons in an RcsA-dependent manner. In the tol mutants, activation of csgDEFG occurred via OmpR and was dominant upon repression by RcsB and RcsA, while these two regulatory proteins repressed csgBA through a dominant effect on the activator protein CsgD, thus affecting curli synthesis. The results demonstrate that the Rcs system, previously known to control the synthesis of the capsule and the flagella, is an additional component involved in the regulation of curli. Furthermore, it is shown that the defect in cell motility observed in the tol mutants depends on RcsB and RcsA.

scholarly journals Trends in the Susceptibility of Clinically Important Resistant Bacteria to Tigecycline: Results from the TigecyclineIn VitroSurveillance in Taiwan Study, 2006 to 2010

2011 ◽  
Vol 56 (3) ◽  
pp. 1452-1457 ◽  
Author(s):  
Yen-Hsu Chen ◽  
Po-Liang Lu ◽  
Cheng-Hua Huang ◽  
Chun-Hsing Liao ◽  
Chin-Te Lu ◽  
...  
Keyword(s):  
Resistant Bacteria ◽  
Gram Negative Bacteria ◽  
Drug Resistant ◽  
Content Type ◽  
E Coli ◽  
Drug Resistant Bacteria ◽  
Vancomycin Resistant ◽  
Susceptibility Rate ◽  
Important Drug

ABSTRACTThe TigecyclineIn VitroSurveillance in Taiwan (TIST) study, a nationwide, prospective surveillance during 2006 to 2010, collected a total of 7,793 clinical isolates, including methicillin-resistantStaphylococcus aureus(MRSA) (n= 1,834), penicillin-resistantStreptococcus pneumoniae(PRSP) (n= 423), vancomycin-resistant enterococci (VRE) (n= 219), extended-spectrum β-lactamase (ESBL)-producingEscherichia coli(n= 1,141), ESBL-producingKlebsiella pneumoniae(n= 1,330),Acinetobacter baumannii(n= 1,645), andStenotrophomonas maltophilia(n= 903), from different specimens from 20 different hospitals in Taiwan. MICs of tigecycline were determined following the criteria of the U.S. Food and Drug Administration (FDA) and the European Committee on Antimicrobial Susceptibility Testing (EUCAST-2011). Among drug-resistant Gram-positive pathogens, all of the PRSP isolates were susceptible to tigecycline (MIC90, 0.03 μg/ml), and only one MRSA isolate (MIC90, 0.5 μg/ml) and three VRE isolates (MIC90, 0.125 μg/ml) were nonsusceptible to tigecycline. Among the Gram-negative bacteria, the tigecycline susceptibility rates were 99.65% for ESBL-producingE. coli(MIC90, 0.5 μg/ml) and 96.32% for ESBL-producingK. pneumoniae(MIC90, 2 μg/ml) when interpreted by FDA criteria but were 98.7% and 85.8%, respectively, when interpreted by EUCAST-2011 criteria. The susceptibility rate forA. baumannii(MIC90, 4 μg/ml) decreased from 80.9% in 2006 to 55.3% in 2009 but increased to 73.4% in 2010. A bimodal MIC distribution was found among carbapenem-susceptibleA. baumanniiisolates, and a unimodal MIC distribution was found among carbapenem-nonsusceptibleA. baumanniiisolates. In Taiwan, tigecycline continues to have excellentin vitroactivity against several major clinically important drug-resistant bacteria, with the exception ofA. baumannii.

scholarly journals Antibacterial effect of acidic ionized water on horse wounds bacterial isolates

2021 ◽  
pp. 1128-1132
Author(s):  
Afiqah Zafirah Abdul Rahman ◽  
Noraniza Mohd Adzahan ◽  
Zunita Zakaria ◽  
Abubakar Musa Mayaki
Keyword(s):  
Chronic Wound ◽  
Antibacterial Effect ◽  
Clinical Importance ◽  
Bactericidal Effect ◽  
Gram Negative Bacteria ◽  
Isolation And Identification ◽  
Gram Positive Bacteria ◽  
Staphylococcus Intermedius ◽  
Infected Wounds ◽  
Time Kill

Background and Aim: Horse wounds can be easily infected with bacteria depending on the nature of its cause such as laceration, abrasion, or puncture as well as the nature of its environment. Various treatments are available in managing open wounds, including the usage of topical antibiotics and antiseptics. However, antibiotic resistance has been a major concern attributed with chronic wound infection. The aim of this study was to test the efficacy of ionized water at different pH against the growth of common bacteria from horse wounds. Materials and Methods: Ten swab samples from equine infected wounds were collected and bacteria isolation and identification were performed. The antibacterial effect of the ionized water of pH 2.5, 4.5, 7.0, and 11.5 was tested on Staphylococcus aureus, Staphylococcus pseudintermedius, Staphylococcus intermedius, Escherichia coli, Pantoea agglomerans, and Klebsiella pneumoniae. The time-kill profiles of the ionized waters were determined at time 0, 2, 4, 6, and 8 h. Results: Ionized water of pH 2.5 and 4.5 showed antibacterial activity against S. aureus, S. pseudintermedius, and S. intermedius with significant (p>0.05) reduction in colony-forming unit/mL within 2-8 h. The degree of bactericidal effect of the acidic ionized water differs between the species with S. intermedius more susceptible. However, there was no antibacterial effect at pH 2.5, 4.5, 7.0, and 11.5 on the Gram-negative bacteria tested. Conclusion: Ionized water of pH 2.5 and 4.5 is effective in minimizing the growth of Gram-positive bacteria; thus it could be of clinical importance as an antiseptic for surface wound lavage in horses.

scholarly journals Antibacterial effect of green tea extract against multi drug resistant Escherichia coli isolated from urine sample of patients visiting tertiary care hospital of Eastern Nepal

2020 ◽  
Vol 8 (1) ◽  
pp. 45-51
Author(s):  
Kabita Giri ◽  
Bijay Kumar Shrestha ◽  
Jenish Shakya ◽  
Shiv Nandan Sah ◽  
Hemanta Khanal
Keyword(s):  
Escherichia Coli ◽  
Green Tea ◽  
Antibacterial Effect ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Green Tea Extract ◽  
Care Hospital ◽  
Drug Resistant ◽  
E Coli ◽  
Tea Extract

Urinary tract infections (UTIs) caused by drug resistant (DR) Uropathogenic Escherichia coli have become a significant worldwide public health problem. Green tea (Camellia sinensis), has been reported to have antimicrobial activities against various pathogenic bacteria. The main aim of our study was to estimate the antibacterial effect of green tea extract against drug resistant Uropathogenic E. coli isolated from urine samples of patients visiting in tertiary care hospital from eastern Nepal. During the study 360 urine samples were collected from UTI suspected patients visiting a tertiary care hospital of Biratnagar. Urine samples were cultured by using semi-quantitative culture technique and bacteria was identified by standard microbiological procedure. Antibiotic susceptibility testing was done by Kirby-Bauer Disk Diffusion method according to NCCLS (2011) guidelines. The antibacterial effect of green tea extract was performed by preparing the 95% ethanol extract in Soxhlet apparatus which was dispensed in DMSO solution and sterilized by membrane filtration. Antibacterial activity of Green Tea Extract against MDR Uropathogenic Escherichia coli was performed by making different concentration of green tea. The overall prevalence of E. coli was 27.22% in study population whereas the prevalence of MDR E. coli was 21.08%. All the isolated E. coli exhibited 100% sensitivity towards Nitrofurantoin and it was still a drug of choice for the treatment of Urinary tract infection caused by E. coli. The green tea extracts exhibited effective antibacterial activity against MDR E. coli. The MIC of Green Tea Extract was found to be 600µg/ml for 24 MDR isolates and 1000µg/ml for remaining 11 isolates. Based on the present study it is concluded that Green Tea extracts have great potential as an antimicrobial agent against E. coli. Int. J. Appl. Sci. Biotechnol. Vol 8(1): 45-51

scholarly journals Removal of Endotoxin during Purification of Poly(3-Hydroxybutyrate) from Gram-Negative Bacteria

1999 ◽  
Vol 65 (6) ◽  
pp. 2762-2764 ◽  
Author(s):  
Sang Yup Lee ◽  
Jong-il Choi ◽  
Kyuboem Han ◽  
Ji Yong Song
Keyword(s):  
Biomedical Applications ◽  
Ralstonia Eutropha ◽  
Gram Negative Bacteria ◽  
Endotoxin Level ◽  
Bacterial Strains ◽  
Digestion Time ◽  
Digestion Method ◽  
Gram Negative ◽  
E Coli ◽  
Chloroform Extraction

ABSTRACT Poly(3-hydroxybutyrate) (PHB) was produced by cultivating several gram-negative bacteria, including Ralstonia eutropha,Alcaligenes latus, and recombinant Escherichia coli. PHB was recovered from these bacteria by two different methods, and the endotoxin levels were determined. When PHB was recovered by the chloroform extraction method, the endotoxin level was less than 10 endotoxin units (EU) per g of PHB irrespective of the bacterial strains employed and the PHB content in the cell. The NaOH digestion method, which was particularly effective for the recovery of PHB from recombinant E. coli, was also examined for endotoxin removal. The endotoxin level present in PHB recovered by 0.2 N NaOH digestion for 1 h at 30°C was higher than 104EU/g of PHB. Increasing the digestion time or NaOH concentration reduced the endotoxin level to less than 1 EU/g of PHB. It was concluded that PHB with a low endotoxin level, which can be used for various biomedical applications, could be produced by chloroform extraction. Furthermore, PHB with a much lower endotoxin level could be produced from recombinant E. coli by simple NaOH digestion.

Synthesis and biological evaluation of novel acyclic and cyclic glyoxamide based derivatives as bacterial quorum sensing and biofilm inhibitors

2017 ◽  
Vol 15 (27) ◽  
pp. 5743-5755 ◽  
Author(s):  
Shashidhar Nizalapur ◽  
Onder Kimyon ◽  
Eugene Yee ◽  
Mohan M. Bhadbhade ◽  
Mike Manefield ◽  
...  
Keyword(s):  
Quorum Sensing ◽  
Biofilm Formation ◽  
Biological Evaluation ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
E Coli ◽  
Sensing Mechanism ◽  
Bacterial Quorum Sensing ◽  
Bacterial Quorum ◽  
Synthesis And Biological Evaluation

Novel acyclic and cyclic glyoxamides that inhibited quorum sensing mechanism and biofilm formation in Gram-negative bacteria such as P. aeruginosa and E. coli.

scholarly journals Significance of CSE-1034 (Elores™) in Treatment of Urinary Tract Infections due to Multi Drug Resistant ESBLPositiveEscherichia coli

2016 ◽  
Vol 9 (6) ◽  
pp. 12
Author(s):  
Vishal Bhambri
Keyword(s):  
Biofilm Formation ◽  
Geriatric Patients ◽  
Efflux Pump ◽  
Drug Resistant ◽  
Over Expression ◽  
E Coli ◽  
Disodium Edetate ◽  
Tract Infections ◽  
Hospital Acquired ◽  
Common Infections

UTIs are one of the most common infections of geriatric patients in community acquired and hospital acquired settings. Escherichia coli(E. coli) is usually the most common pathogen responsible for UTI.Antibiotic resistance is the main reason for failure of therapy especially in E. coli. Biofilm formation, ESBL and MBL production&efflux pump over expression are the main reasons for antibiotic resistance in E. coli. That’s why management of UTI with multi drug resistant (MDR)E. coli has always been challenge for the clinicians.We are reporting empiric use of new antibiotic adjuvant entity Elores™(Ceftriaxone/ Sulbactam/Disodium-edetate) in the management of UTIs caused by multi drug resistant E. coli.

scholarly journals Isolasi dan Identifikasi Bakteri Gram Negatif pada Uterus Sapi Aceh yang Mengalami Repeat Breeding

2020 ◽  
Vol 20 (2) ◽  
Author(s):  
Indi Rafika ◽  
Cut Nila Thasmi ◽  
Herrialfian Herrialfian ◽  
Rosmaidar Rosmaidar ◽  
Hafizuddin Hafizuddin
Keyword(s):  
Escherichia Coli ◽  
Nutrient Broth ◽  
Gram Negative Bacteria ◽  
Pseudomonas Sp ◽  
Isolation And Identification ◽  
Gram Negative ◽  
E Coli ◽  
Identification Of Bacteria

ABSTRAK. Penelitian ini bertujuan mengetahui jenis bakteri Gram negatif pada uterus sapi Aceh yang mengalami kawin berulang. Dalam penelitian ini digunakan enam ekor sapi Aceh betina yang terdiri atas tiga ekor sapi fertil (K1) dan tiga ekor yang mengalami kawin berulang (K2, repeat breeding, RB). Pengambilan sampel bakteri dalam uterus sapi dilakukan dengan menggunakan swab steril yang disimpan dalam media nutrient broth (NB) untuk isolasi dan identifikasi jenis bakterinya. Berdasarkan hasil penelitian, baik K1 dan K2, positif terinfeksi bakteri dan diperoleh 16 isolat bakteri di antaranya enam isolat berasal dari K1 dan sepuluh isolat berasal dari K2. Dari 10 isolat bakteri Gram negatif yang ditemukan pada sapi RB terdiri atas Escherichia coli (E. coli) (30,00%), Pseudomonas sp. (30,00%), Enterobacter sp. (20,00%), Klebsiella sp. (20,00%). Disimpulkan bahwa bakteri yang paling banyak menginfeksi uterus sapi RB adalah E. coli dan Pseudomonas sp. (Isolation and identification of gram negative bacteria in uterine Aceh cow with repeat breeding) ABSTRACT. The study determined the type of Gram negative bacteria of the Aceh cattle uterus which has been diagnosed with repeat breeding. The study was conducted on six Aceh cows consists of 3 normal fertile cows (K1) and 3 repeat breeding cows (K2, RB). The bacteria in uterine samples were collected using sterile swab, kept into nutrient broth (NB) for further isolation and identification of bacteria. The result of the study showed that the total of 16 isolates of bacteria was observed in all cows : 6 isolates from group K1 and 10 isolates from group K2. A total of 10 isolates from cattle with repeat breeding consist of Escherichia coli (E. coli) (30.00%), Pseudomonas sp (30.00%), Enterobacter sp (20.0%), and Klebsiella sp (20.0%). It can be concluded that the most bacteria that infect uterine cows with repeat breeding are E. coli and Pseudomonas sp.

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