Changes in the activity of antifungals in mixed cultures of bacteria and yeasts

1981 ◽  
Vol 27 (8) ◽  
pp. 843-846 ◽  
Author(s):  
M. H. Domon ◽  
L. G. Mathieu ◽  
J. de Repentigny
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Salmonella Typhimurium ◽  
Direct Effect ◽  
Culture Medium ◽  
Antifungal Agents ◽  
Mixed Cultures ◽  
Sterol Metabolism ◽  
Pure Cultures

When Candida cells were grown in mixed cultures with Escherichia coli, Salmonella typhimurium, or Pseudomonas aeruginosa, their sensitivity to antifungal agents affecting sterol metabolism or functioning (polyenes and miconazole) was increased by several log units. This phenomenon was overcome by the addition to the culture medium of sugars utilized either by the bacteria or the yeast. Antifungals without direct effect on sterol metabolism (5-fluorocytosine, methylparaben, and 4-hydroxyquinazoline) were not more active in mixed than in pure cultures.

In Vitro Inhibition of the Growth of Salmonella typhimurium and Escherichia coli 0157:H7 by Bacteria Isolated from the Cecal Contents of Adult Chickens

1991 ◽  
Vol 54 (7) ◽  
pp. 496-501 ◽  
Author(s):  
ARTHUR HINTON ◽  
GEORGE E. SPATES ◽  
DONALD E. CORRIER ◽  
MICHAEL E. HUME ◽  
JOHN R. DELOACH ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Lactic Acid ◽  
Salmonella Typhimurium ◽  
Mixed Cultures ◽  
Enterococcus Durans ◽  
E Coli ◽  
Pure Cultures ◽  
In Vitro Inhibition ◽  
Lactic Acids

A Veillonella species and Enterococcus durans were isolated from the cecal contents of adult broilers. Mixed cultures of Veillonella and E. durans inhibited the growth of Salmonella typhimurium and Escherichia coli 0157:H7 on media containing 2.5% lactose (w/v). The growth of S. typhimurium or E. coli 0157:H7 was not inhibited by mixed cultures containing Veillonella and E. durans on media containing only 0.25% lactose or by pure cultures of Veillonella or E. durans on media containing either 0.25% or 2.5% lactose. The mixed cultures of Veillonella and E. durans produced significantly (P<0.05) more acetic, propionic, and lactic acids in media containing 2.5% lactose than in media containing 0.25% lactose. The inhibition of the enteropathogens was related to the production of lactic acid from lactose by the E. durans and the production of acetic and propionic acids from lactic acid by the Veillonella.

INTERACTION BETWEEN ESCHERICHIA COLI AND PSEUDOMONAS AERUGINOSA IN MIXED CULTURES

1965 ◽  
Vol 11 (6) ◽  
pp. 947-952 ◽  
Author(s):  
R. K. Guthrie ◽  
B. H. Cooper ◽  
J. K. Ferguson ◽  
H. E. Allen
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Carbohydrate Metabolism ◽  
Mixed Cultures ◽  
Pure Cultures ◽  
Stimulation Of

Both continuous and stationary cultures were used to detect interactions between Escherichia coli and Pseudomonas aeruginosa in mixed cultures, with pure cultures included as controls. The interactions observed were both pH and substrate dependent. Stimulation of P. aeruginosa in mixture was the most marked interaction, and was, in part, due to changes in carbohydrate metabolism.

XÁC ĐỊNH THÀNH PHẦN HÓA HỌC VÀ KHẢ NĂNG KHÁNG VI SINH VẬT CỦA CAO CHIẾT ETHANOL LY TRÍCH TỪ THÂN RỄ LOÀI THIÊN NIÊN KIỆN PI-E (HOMALOMENA PIERREANA)

2020 ◽  
Vol 39 (03) ◽  
Author(s):  
VĂN HỒNG THIỆN ◽  
LÊ BÍCH TRÂM ◽  
NGUYỄN THANH LAN ◽  
HỒ NGUYỄN HOÀNG YẾN ◽  
LƯU HỒNG TRƯỜNG ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacillus Subtilis ◽  
Salmonella Typhimurium ◽  
Salmonella Enteritidis

Nghiên cứu này đã xác định được mẫu nghiên cứu thu tại Vườn quốc gia Phú Quốc là loài Homalomena pierreana. Thông qua kỹ thuật sắc ký ghép khối phổ, 10 hợp chất thuộc nhóm sesquiterpene có trong cao chiết ethanol của thân rễ loài H. pierreana đã được xác định. Ngoài ra, cao chiết ethanol từ mẫu nghiên cứu cũng cho thấy khả năng kháng lại 6 chủng vi khuẩn kiểm định là Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Salmonella enteritidis và Salmonella typhimurium.

scholarly journals In Vitro Activity of Trovafloxacin against Bacteroides fragilis in Mixed Culture with either Escherichia coli or a Vancomycin- Resistant Strain of Enterococcus faecium Determined by an Anaerobic Time-Kill Technique

2001 ◽  
Vol 45 (1) ◽  
pp. 243-251 ◽  
Author(s):  
Lorna E. T. Stearne ◽  
Clarissa Kooi ◽  
Wil H. F. Goessens ◽  
Irma A. J. M. Bakker-Woudenberg ◽  
Inge C. Gyssens
Keyword(s):  
Escherichia Coli ◽  
Resistant Strain ◽  
Enterococcus Faecium ◽  
Mixed Cultures ◽  
E Coli ◽  
Abdominal Abscesses ◽  
Pure Cultures ◽  
Vancomycin Resistant ◽  
Time Kill

ABSTRACT To determine the efficacy of trovafloxacin as a possible treatment for intra-abdominal abscesses, we have developed an anaerobic time-kill technique using different inocula to study the in vitro killing ofBacteroides fragilis in pure culture or in mixed culture with either Escherichia coli or a vancomycin-resistant strain of Enterococcus faecium (VREF). With inocula of 5 × 105 CFU/ml and trovafloxacin concentrations of ≤2 μg/ml, a maximum observed effect (E max) of ≥6.1 (log10 CFU/ml) was attained with all pure and mixed cultures within 24 h. With inocula of 108CFU/ml, a similar E max and a similar concentration to produce 50% of E max(EC50) for B. fragilis were found in both pure cultures and mixed cultures with E. coli. However, to produce a similar killing of B. fragilis in the mixed cultures with VREF, a 14-fold increase in the concentration of trovafloxacin was required. A vancomycin-susceptible strain of E. faecium and a trovafloxacin-resistant strain of E. coli were also found to confer a similar “protective” effect on B. fragilis against the activity of trovafloxacin. Using inocula of 109 CFU/ml, the activity of trovafloxacin was retained for E. coli and B. fragilis and was negligible against VREF. We conclude that this is a useful technique to study the anaerobic killing of mixed cultures in vitro and may be of value in predicting the killing of mixed infections in vivo. The importance of using mixed cultures and not pure cultures is clearly shown by the difference in the killing of B. fragilis in the mixed cultures tested. Trovafloxacin will probably be ineffective in the treatment of infections involving large numbers of enterococci. However, due to its ability to retain activity against large cultures of B. fragilis and E. coli, trovafloxacin could be beneficial in the treatment of intra-abdominal abscesses.

scholarly journals Comparative Studies on Antibacterial Efficacy of Natural & Artificial Honey on Isolated Pathogens from Burnt Wound Sample

2020 ◽  
Vol 11 (SPL4) ◽  
pp. 269-275
Author(s):  
Vijaya Benerji G ◽  
Anantha Lakshmi Y ◽  
Shankar K ◽  
Punitha V C
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacterial Pathogen ◽  
Isolation And Characterization ◽  
Wound Contamination ◽  
Nutrient Agar Medium ◽  
Pure Cultures ◽  
Made In

The present study dealt with the Isolation and Characterization of a bacterial pathogen from a burnt wound sample. The burnt Wound contamination may be a major muddling previously, patients. Blazed wounds indicated essentially higher bacterial tallies compared for the normal wound. The burnt wound sample was inoculated using nutrient agar medium and medium and incubated at 37oC for 24 hrs. After incubation pure cultures of organisms were made in respective agar mediums. The pure culture of bacteria was identified and characterized as Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. These organisms are dangerous pathogens penetrating the wound, producing a lot of pain and exudates. The improvement of blazed wound contamination is not another wonder and is a progressing issue for numerous individuals. Open wounds serve by a passage course to sullying 28 with attacking microorganisms. Furthermore Postponed wound recuperating about contaminated smolder wounds; it will be connected with expanded discomfort, healing center sit tight and human services expenses. The introduce fill in on the honey demonstrated antibacterial movement against the blazed wound pathogenic microscopic organisms for example, such that escherichia coli, staphylococcus aureus Furthermore Pseudomonas aeruginosa. It will meet the requirements of essential products required in humans, animals as well as in the pharmaceutical industry. The natural honey is more effective and safer than artificial honey and the antibiotics against the burnt wound pathogens.

Interactions of Pseudomonas aeruginosa in predominant biofilm or planktonic forms of existence in mixed culture with Escherichia coli in vitro

2013 ◽  
Vol 59 (9) ◽  
pp. 604-610 ◽  
Author(s):  
Marina V. Kuznetsova ◽  
Irina L. Maslennikova ◽  
Tamara I. Karpunina ◽  
Larisa Yu. Nesterova ◽  
Vitaly A. Demakov
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Total Concentration ◽  
Single Species ◽  
Mixed Cultures ◽  
Interspecies Interactions ◽  
E Coli ◽  
Predominant Form ◽  
The One

Pseudomonas aeruginosa and Escherichia coli are known to be involved in mixed communities in diverse niches. In this study we examined the influence of the predominant form of cell existence of and the exometabolite production by P. aeruginosa strains on interspecies interactions, in vitro. Bacterial numbers of P. aeruginosa and E. coli in mixed plankton cultures and biofilms compared with their numbers in single plankton cultures and biofilms changed in a different way, but were in accordance with the form of P. aeruginosa cell existence. The mass of a mixed-species biofilm was greater than the mass of a single-species biofilm. Among the mixed biofilms, the one with the “planktonic” P. aeruginosa strain had the least biomass. The total pyocyanin and pyoverdin levels were found to be lower in all mixed plankton cultures. Despite this, clinical P. aeruginosa strains irrespective of the predominant form of existence (“biofilm” or “planktonic”) had a higher total concentration of exometabolites than did the reference strain in 12–24 h mixed cultures. The metabolism of E. coli, according to its bioluminescence, was reduced in mixed cultures, and the decrease was by 20- to 100-fold greater with the clinical Pseudomonas strains than the reference Pseudomonas strain. Thus, both the predominant form of existence of and the exometabolite production by distinct P. aeruginosa strains should be considered to fully understand the interspecies relationship and bacteria survival in natural communities.

scholarly journals PCR multiplex para identificação de isolados de Clostridium chauvoei e Clostridium septicum

2008 ◽  
Vol 60 (2) ◽  
pp. 294-298 ◽  
Author(s):  
R.A. Assis ◽  
F.C.F. Lobato ◽  
Z.I.P. Lobato ◽  
M.F. Camargos ◽  
R.A.P. Nascimento ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Salmonella Typhimurium ◽  
Enterobacter Aerogenes ◽  
Clostridium Septicum ◽  
Pcr Multiplex ◽  
Clostridium Chauvoei

Padronizou-se uma técnica de reação em cadeia da polimerase múltipla (PCR multiplex) para detecção de Clostridium chauvoei e Clostridium septicum em culturas puras. Foram utilizados pares de iniciadores para segmentos específicos dos genes que codificam a flagelina de C. chauvoei e a toxina alfa de C. septicum. Para avaliaçã o da PCR multiplex, foram testados 16 isolados clínicos de C. chauvoei e 15 isolados de C. septicum provenientes de ruminantes, quatro sementes vacinais de cada um desses agentes. Amostras de referência de ambos os microrganismos foram usadas como controle. Para avaliar a especificidade, DNAs genômicos dos seguintes microrganismos foram usados: C. sordellii, C. novyi tipo A, C. novyi tipo B, C. perfringens tipo A, C. haemolyticum, C. botulinum tipo D, Pseudomonas aeruginosa, Staphylococcus aureus, Enterobacter aerogenes, Escherichia coli e Salmonella typhimurium. Todos os isolados e sementes vacinais de C. chauvoei e C. septicum foram detectados pela técnica. Não foram observadas reações cruzadas com as outras espécies de clostrídios, outras espécies bacterianas ou entre C. Chauvoei e C. septicum. As menores concentrações de DNA de C. chauvoei e C. septicum detectadas foram 45pg/µl e 30pg/µl, respectivamente. A PCR multiplex pode ser utilizada para a identificação específica de C. chauvoei e C. septicum em culturas puras.

scholarly journals Potencial antimicrobiano, citotóxico e leishmanicida do extrato em diclorometano das partes aéreas de Mitracarpus frigidus (Rubiaceae)

2020 ◽  
Vol 17 (1) ◽  
Author(s):  
Rodrigo Luiz Fabri ◽  
Paula Spagnol Da Cunha ◽  
Lara Melo Campos ◽  
Ari Sérgio de Oliveira Lemos ◽  
Elaine Soares Coimbra ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Candida Albicans ◽  
Klebsiella Pneumoniae ◽  
Salmonella Typhimurium ◽  
Bacillus Cereus ◽  
Cryptococcus Neoformans ◽  
Artemia Salina ◽  
Shigella Sonnei

Este presente estudo teve como objetivo investigar o potencial antimicrobiano, leishmanicida e citotóxico do extrato em diclorometano das partes aéreas de Mitracarpus frigidus. Além de identificar as principais classes de metabólitos especiais desse extrato. Para realização dos ensaios biológicos foram testadas nove linhagens de microrganismos (Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella typhimurium, Shigella sonnei, Klebsiella pneumoniae, Escherichia coli, Bacillus cereus, Candida albicans e Cryptococcus neoformans), duas espécies de Leishmanias (L. amazonensis e L. chagasi). A citotoxicidade foi testada frente ao microcrustáceo Artemia salina. Os resultados mostraram que o extrato em diclorometano apresentou expressiva atividades leishmanicida, frente a ambas formas promastigotas das espécies de Leishmanias, e antimicrobiana, principalmente contra B. cereus e C. neoformans. O ensaio de bioautografia identificou que as classes que possuem atividade antifúngica foram alcaloides e triterpenos. Os resultados apresentados abrem perspectivas para o futuro isolamento, purificação e identificação das substâncias bioativas de Mitracarpus frigidus que possam ser utilizadas no tratamento de infecções microbianas e leishmanioses.

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