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Letters in Applied Microbiology

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https://www.readbyqxmd.com/read/28208218/antibiotic-resistance-in-escherichia-coli-in-husbandry-animals-the-african-perspective
#1
REVIEW
Carla Andrea Alonso, Myriam Zarazaga, Rym Ben Sallem, Ahlem Jouini, Karim Ben Slama, Carmen Torres
In the last years different surveillances have been published in Africa, especially in Northern countries, regarding antimicrobial resistance among husbandry animals. Information is still scarce, but the available data shows a worrying picture. Although the highest resistance rates have been described against tetracycline, penicillins and sulphonamides, prevalence of plasmid mediated quinolone resistance genes and extended-spectrum β-lactamase (ESBL) are being increasingly reported. Among ESBLs, the CTX-M-1 group was dominant in most African surveys, being CTX-M-15 the main variant both in animals and humans, except in Tunisia where CTX-M-1 was more frequently detected among E...
February 16, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28178767/probiotic-bacteria-inhibit-the-bovine-respiratory-pathogen-mannheimia-haemolytica-serotype-1-in-vitro
#2
S Amat, S Subramanian, E Timsit, T W Alexander
This study evaluated the potential of probiotic bacteria to inhibit growth and cell adhesion of the bovine respiratory pathogen Mannheimia haemoltyica serotype 1. The inhibitory effects of nine probiotic strains (Lactobacillus acidophilus, L. casei, L. helveticus, L. plantarum, L. rhamnosus, Lactococcus lactis, Streptococcus thermophilus and two Paenibacillus polymyxa strains) against M. haemolytica were evaluated using a spot-on-lawn method. Probiotic strains were then tested for their adherence to bovine bronchial epithelial (BBE) cells and the ability to displace and compete against M...
February 8, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28140472/lactobacillus-acidophilus-inmia-9602-er-2-strain-317-402-probiotic-regulates-growth-of-commensal-escherichia-coli-in-gut-microbiota-of-familial-mediterranean-fever-disease-subjects
#3
A Z Pepoyan, M H Balayan, A M Manvelyan, V Mamikonyan, M Isajanyan, V V Tsaturyan, S Kamiya, V Netrebov, M L Chikindas
Previously, we reported a positive effect the probiotic formulation, Lactobacillus acidophillus INMIA 9602 Er-2 strain 317/402 (Narine strain), had on the blood characteristics of patients with familial Mediterranean fever disease (FMF). The aim of this investigation was to evaluate the effect of the Narine probiotic on growth characteristics in the predominant commensal Escherichia coli isolates from the gut microbiota in FMF positive study participants. Bacterial growth of 192 prevalent commensal E. coli isolates found in the volunteer participants' guts were evaluated using Verhulst's logistic function...
January 31, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28129445/mathematical-modeling-of-growth-of-listeria-monocytogenes-in-raw-chilled-pork
#4
Keping Ye, Kai Wang, Mei Liu, Jia Liu, Lei Zhu, Guanghong Zhou
The aim of this study was to analyze the growth kinetics of Listeria monocytogenes in naturally contaminated chilled pork. A cocktail of 26 meat-borne L. monocytogenes was inoculated to raw or sterile chilled pork to observe its growth at 4, 10, 16, 22 and 28 °C, respectively. The growth data were fitted by the Baranyi model and Ratkowsky square-root model. Results showed that the Baranyi model and Ratkowsky square-root model could describe the growth characteristics of L. monocytogenes at different temperatures reasonably well in raw chilled pork (1...
January 27, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28129432/distribution-of-tomato-spotted-wilt-virus-in-dahlia-plants
#5
Shunsuke Asano, Yoshihiko Hirayama, Yosuke Matsushita
Tomato spotted wilt virus (TSWV) causes significant losses in the production of the ornamental plant Dahlia variabilis in Japan. The purpose of this study was to examine the distribution of TSWV in dahlia plants and identify plant parts that can be used in the selection of TSWV-free plants. The distribution of TSWV was investigated using reverse transcriptional polymerase chain reaction (RT-PCR) and tissue blot immunoassay. The detection rate of TSWV in latent infected compound leaves was the highest in the petiole, and it decreased from the veins and rachis to the lamina...
January 27, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28117485/evaluation-of-a-most-probable-number-method-for-the-enumeration-of-legionella-pneumophila-from-potable-and-related-water-samples
#6
D P Sartory, K Spies, B Lange, S Schneider, B Langer
This study compared the performance of a novel MPN method (Legiolert/Quanti-Tray) with the ISO 11731-2 membrane filtration method for the enumeration of L. pneumophila from 100 ml potable water and related samples. Data from a multi-laboratory study analysed according to ISO 17994 showed that Legiolert(™) /Quanti-Tray(®) yielded on average higher counts of L. pneumophila. The Legiolert medium had a high specificity of 96.4%. The new method represents a significant improvement in the enumeration of L. pneumophila from drinking water related samples...
January 24, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28107573/diversity-and-bioprospecting-of-actinomycete-endophytes-from-the-medicinal-plants
#7
REVIEW
Nalini Monnanda Somaiah, Harishchandra Sripathy Prakash
The endophytic actinomycetes constitute one of the fascinating group of microorganisms associated with a wide range of plant species. The diversity of actinomycetes in plants and their tissue parts is a matter of debate as no consensus are derived between individual studies. Nevertheless, their diversity correlates with the occurrence in plant species harbored in unique regions of biologically diverse areas called 'hot spots'. Recent advances in the isolation techniques have facilitated the isolation of rare taxa from these environments...
January 20, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28101930/effect-of-humidity-and-temperature-on-the-survival-of-listeria-monocytogenes-on-surfaces
#8
James Redfern, Joanna Verran
Listeria monocytogenes is a pathogenic bacterium, with human disease and infection linked to dairy products, seafood, ready-to-eat meat and raw & undercooked meats. Stainless steel is the most common food preparation surface and therefore, it is important to understand how food storage conditions such as surface materials, temperature and relative humidity can affect survival of L. monocytogenes. In this study, survival of L. monocytogenes on stainless steel was investigated at three temperatures (4, 10 and 21°C), each approx...
January 19, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28100014/mg-2-improves-the-thermotolerance-of-probiotic-lactobacillus-rhamnosus-gg-lactobacillus-casei-zhang-and-lactobacillus-plantarum-p-8
#9
Yi Yang, Song Huang, Juan Wang, Gwénaël Jan, Romain Jeantet, Xiao Dong Chen
Food related carbohydrates and proteins are often used as thermoprotectant for probiotic lactobacilli during industrial production and processing. However, the effect of inorganic salts is rarely reported. Magnesium is the second-most abundant cation in bacteria, and commonly found in various foods. Mg(2+) homeostasis is important in Salmonella and has been reported to play a critical role in their thermotolerance. However, Mg(2+) role in thermotolerance of other bacteria, in particular probiotic bacteria, still remains a hypothesis...
January 18, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28099994/the-impact-of-primer-sets-on-detection-of-the-gene-encoding-biofilm-associated-protein-bap-in-acinetobacter-baumannii-in-silico-and-in-vitro-analysis
#10
Mansoor Kodori, Masoumeh Douraghi, Mehdi Yaseri, Mohammad Rahbar
The Acinetobacter baumannii virulence protein Bap is encoded by a large gene and contains both variable sequence and repetitive modules. To date, four primer sets targeting different regions of bap have been designed, but no study has evaluated all these primers simultaneously for detection of bap. Here, we assessed the effect of primer sets Bap I to IV, on detection of bap both in silico and in vitro. Using the primer set Bap II, all 143 tested strains yielded an amplicon corresponding to bap gene. This primer set showed the highest sensitivity (100%, 95% CI: 97...
January 18, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28083911/degradation-of-methomyl-by-the-combination-of-aminobacter-sp-mdw-2-and-afipia-sp-mdw-3
#11
Chenfei Zhang, Zhangong Yang, Wen Jin, Xiang Wang, Yingkun Zhang, Shijun Zhu, Xing Yu, Gang Hu, Qing Hong
Methomyl [S-methyl N-(methylcarbamoyloxy) thioacetimidate] is a kind of oxime carbamate insecticide. It is considered to be extremely toxic to non-target organism. Up to date, no pure culture or consortium has been reported to have the ability to degrade methomyl completely. In the present study, a methomyl-degrading enrichment E1 was obtained by using the sludge from the wastewater-treating system of a pesticide manufacturer as the original inoculant. Two bacterial strains named MDW-2 and MDW-3 were isolated from this enrichment, and they were preliminarily identified as Aminobacter sp...
January 13, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28063174/oral-supplementation-of-trans-cinnamaldehyde-reduces-uropathogenic-escherichia-coli-colonization-in-a-mouse-model
#12
A Narayanan, M S Muyyarikkandy, S Mooyottu, K Venkitanarayanan, M A R Amalaradjou
: Urinary tract infections (UTIs) in the United States result in more than 7 million hospital visits per year. Uropathogenic Escherichia coli (UPEC) is responsible for more than 80% of UTIs. Although antibiotics are the drug of choice to control UTIs, their repeated use has resulted in the emergence of antibiotic-resistant UPEC. Thus, there is a need for effective alternate strategies to control UPEC infections. This study investigated the efficacy of trans-cinnamaldehyde (TC), a food-grade molecule present in cinnamon, in reducing UPEC colonization and pathogenesis in the lower UTI...
January 7, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28060422/identification-of-fungi-isolated-from-banana-rachis-and-characterization-of-their-surface-activity
#13
Lina Mendez-Castillo, Erlide Prieto-Correa, Carlos Jimenez-Junca
Filamentous fungi are an unexplored source for the production of biosurfactants, but over a decade it was discovered one of the most surface active molecules called hydrophobins. There are few techniques to determine the surface activity of fungi without some kind of manipulation that can affect the final results. In this work, we identified 33 strains of filamentous fungi isolated from banana rachis which may have potential in producing biosurfactants. Further the production of surface active compounds by the strains was measured by two techniques...
January 6, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28052349/chemical-composition-and-antifungal-activity-of-carica-papaya-linn-seeds-essential-oil-against-candida-spp
#14
Xiaowen He, Yinzheng Ma, Guohui Yi, Jinyan Wu, Limin Zhou, Hong Guo
In recent years, the incidence of clinical yeast infections has increased dramatically. Due to the extensive use of broad-spectrum antifungal agents, there has been a notable increase in drug resistance among infections yeast species. As one of the most popular natural antimicrobial agents, essential oils (EOs) have attracted a lot of attention from the scientific community. The aim of this study was to analyze the chemical composition and examine the antifungal activity of the EO extracted from the seeds of Carica papaya Linn...
January 4, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28036110/detection-and-molecular-characterization-of-livestock-associated-mrsa-in-raw-meat-on-retail-sale-in-north-west-england
#15
A Fox, B Pichon, H Wilkinson, M Doumith, R L R Hill, J McLauchlin, A M Kearns
: Limited data are available on the prevalence of livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) in the UK. We tested 124 raw meat samples for MRSA including pork (n = 63), chicken (n = 50) and turkey (n = 11) collected from retail outlets in North West England between March and July 2015. MRSA was recovered from nine (7·3%) samples (four chicken, three pork and two turkey) from different butchers and supermarkets. Four were labelled of UK origin, three were from continental Europe; the origin was not specified for two samples...
December 30, 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28035685/a-medicinal-herb-cassia-alata-attenuates-quorum-sensing-in-chromobacterium-violaceum-and-pseudomonas-aeruginosa
#16
P D Rekha, H S Vasavi, C Vipin, K Saptami, A B Arun
Quorum sensing (QS) has been shown to play a crucial role in the pathogenesis in many bacteria and attenuation of QS is one of the targets of antimicrobial therapy with particular interest in combating drug resistance. This study reports the QS inhibitory activity of metabolites from Cassia alata L. (Ca. alata), an important medicinal herb widely used in the treatment of microbial infections. For investigating the QS inhibition (QSI) potential of Ca. alata L., initially, metabolites of the leaves extracted using ethanol were tested against biosensor strain Chromobacterium violaceum CV026 and C...
December 30, 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28024103/multiple-reaction-monitoring-for-multiplex-detection-of-three-bacterial-toxins-using-liquid-chromatography-tandem-mass-spectrometry
#17
S I Alam, A Uppal, P Gupta, D V Kamboj
Clostridium perfringens epsilon toxin, staphylococcal enterotoxin B and shiga toxin are implicated in a number of diseases and food-borne intoxications and are considered potential agents for bioterrorism and warfare. Artificially generated aerosol is the likely mode of delivery of these for nefarious uses, potentially capable of causing mass destruction to human and animal health by inhalation of toxic bioaerosol. Multiplex and unambiguous detection of these agents is of paramount importance for emergency response in a biothreat scenario and for food safety...
December 26, 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/27992658/antimicrobial-activity-of-manuka-honey-against-antibiotic-resistant-strains-of-the-cell-wall-free-bacteria-ureaplasma-parvum-and-ureaplasma-urealyticum
#18
K L Hillitt, R E Jenkins, O B Spiller, M L Beeton
: The susceptibility of the cell wall-free bacterial pathogens Ureaplasma spp. to Manuka honey was examined. The minimum inhibitory concentration (MIC) of Manuka honey for four Ureaplasma urealyticum and four Ureaplasma parvum isolates was determined. Sensitivity to honey was also compared to clinical isolates with resistance to tetracycline, macrolide and fluoroquinolone antibiotics. Finally step-wise resistance training was utilized in an attempt to induce increased tolerance to honey...
December 19, 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/27992657/protection-of-penaeus-monodon-against-white-spot-syndrome-by-continuous-oral-administration-of-a-low-concentration-of-bacillus-subtilis-spores-expressing-the-vp28-antigen
#19
K-C Pham, H T T Tran, C Van Doan, P H Le, A T Van Nguyen, H A Nguyen, H A Hong, S M Cutting, T-N Phan
: In this study, Bacillus subtilis spores expressing a chimeric protein, CotB-VP28, were used as a probiotic vaccine to protect black tiger shrimps (Penaeus monodon) against white spot syndrome virus (WSSV) infection. Oral administration of pellets coated with CotB-VP28 spores (at ≥1 × 10(9 ) CFU per g pellet) to shrimps induced immune-relating phenoloxydase activity (PO) in shrimps after 14 days of feeding (prior challenge) and at day 3 post challenge (1·26 and 1·70 fold increase respectively)...
December 19, 2016: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/27987523/culture-methods-impact-recovery-of-antibiotic-resistant-enterococci-including-enterococcus-cecorum-from-pre-and-post-harvest-chicken
#20
M M Suyemoto, Hjb Barnes, L B Borst
Pathogenic strains of Enterococcus cecorum (EC) expressing multidrug resistance have emerged. In National Antimicrobial Resistance Monitoring System (NARMS) data, EC is rarely recovered from chickens. Two NARMS methodologies (FDA, USDA) were compared with standard culture (SC) techniques for recovery of EC. NARMS methods failed to detect EC in 58 cecal samples, 20 chicken breast or 6 whole broiler samples. EC was recovered from 1 of 38 (2.6%) and 2 of 38 (5.2%) pre-harvest spinal lesions (USDA and FDA method respectively)...
December 17, 2016: Letters in Applied Microbiology
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