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Letters in Applied Microbiology

Cover image for Vol. 57 Issue 3

September 2013

Volume 57, Issue 3

Pages 165–257

  1. Editor's Choice

    1. Top of page
    2. Editor's Choice
    3. Original Articles
    1. You have free access to this content
  2. Original Articles

    1. Top of page
    2. Editor's Choice
    3. Original Articles
    1. You have free access to this content
      Efficacy of a dual fluorescence method in detecting the viability of overwintering cyanobacteria (pages 174–180)

      T. Zhu and X. Xu

      Version of Record online: 20 MAY 2013 | DOI: 10.1111/lam.12095

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      Significance and Impact of the Study: This study established the efficacy of the dual fluorescence method in evaluating the viability of cyanobacteria under chill-light stress. The results provided the direct evidence for acquired chill-light tolerance and the viability of overwintering Microcystis colonies. Such information can be useful in prediction of cyanobacterial blooms.

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      Genotypic and phenotypic characterization of methicillin-resistant Staphylococcus aureus (MRSA) isolated from milk of bovine mastitis (pages 181–186)

      M. Bardiau, K. Yamazaki, J.-N. Duprez, B. Taminiau, J.G. Mainil and I. Ote

      Version of Record online: 30 MAY 2013 | DOI: 10.1111/lam.12099

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      Significance and Impact of the Study: This study confirms the presence of ST398 MRSA in milk from bovine mastitis in Belgium. Moreover, the isolated MRSA strains were described for genotypic and phenotypic characteristics potentially implicated in virulence. This study highlights that Belgian bovine could be a reservoir of MRSA for human.

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      In vitro cholesterol-lowering properties of Lactobacillus plantarum AN6 isolated from aji-narezushi (pages 187–192)

      T. Kuda, T. Yazaki, M. Ono, H. Takahashi and B. Kimura

      Version of Record online: 20 MAY 2013 | DOI: 10.1111/lam.12094

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      Significance and Impact of the Study: Lactobacillus plantarum AN6 was isolated from aji-narezushi. Cholesterol-lowering activity of AN6 was higher than ones of the type strain. Cell surface of AN6 was rough. FT-IR analysis indicated that the content of cell wall polysaccharides of AN6 is higher than ones in the type strain. These results indicate that AN6 can be used as a new profitable starter and probiotic.

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      New insights on the effectiveness of Metarhizium anisopliae formulation and application against Aedes aegypti eggs (pages 193–199)

      N.A. Sousa, L.S. Lobo, J. Rodrigues and C. Luz

      Version of Record online: 28 MAY 2013 | DOI: 10.1111/lam.12097

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      Significance and Impact of the Study: The entomopathogenic fungus Metarhizium anisopliae has been extensively studied as a potential agent for biological mosquito control. This study demonstrates the potential of M. anisopliae s.l. strain IP 46, which can infect adults, larvae and eggs of Aedes aegypti, against the eggs of this important vector species by indirect applications of oil-based conidial formulations.

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      Isolation and characterization of fatty acid methyl ester (FAME)-producing Streptomyces sp. S161 from sheep (Ovis aries) faeces (pages 200–205)

      Y. Lu, J. Wang, Z. Deng, H. Wu, Q. Deng, H. Tan and L. Cao

      Version of Record online: 20 MAY 2013 | DOI: 10.1111/lam.12096

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      Significance and Impact of the Study: Nowadays, production of biodiesel is based on plant oils, animal fats, algal oils and microbial oils. Lipid mostly consists of triacylglycerols (TAG), and conversion of these lipids into fatty acid short-chain alcohol esters (methanol or ethanol) is the final step in biodiesel production. In this study, an oil-producing Streptomyces strain was isolated from sheep faeces. The oil was composed of C14-C16 long-chain fatty acid methyl esters, triglycerides and monoglycerides. This is the first isolated strain-producing biodiesel (FAME) directly from starch. Due to showing cellulase and xylanase activities, the strain would be helpful for converting renewable lignocellulose into biodiesel directly.

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      Freezing as an intervention to reduce the numbers of campylobacters isolated from chicken livers (pages 206–213)

      D. Harrison, J.E.L. Corry, M.A. Tchórzewska, V.K. Morris and M.L. Hutchison

      Version of Record online: 28 MAY 2013 | DOI: 10.1111/lam.12098

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      Significance and Impact of the Study: Freezing chicken livers can reduce, but not eliminate, campylobacters. If poultry processors were to freeze livers destined for human consumption as part of routine processing, there is a potential for a reduction in campylobacteriosis associated with the consumption of imperfectly cooked chicken livers and derivatives, such as pâté.

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      An extension of the coconut cream agar method to screen Penicillium citrinum isolates for citrinin production (pages 214–219)

      S. Mohamed, S. Flint, J. Palmer, G. C. Fletcher and J. I. Pitt

      Version of Record online: 24 JUN 2013 | DOI: 10.1111/lam.12102

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      Significance and Impact of the Study: Citrinin is a nephrotoxic mycotoxin produced by several species belonging to the genera Aspergillus, Penicillium and Monascus. A simple and rapid screening method was developed for screening citrinin in fungal cultures using Coconut Cream Agar (CCA) described previously. This method provides a direct indication of the presence of citrinin after four to 5 days incubation at 25°C. The method has been tested using fifteen isolates of P. citrinum and appears to be suitable for large scale screening of cultures for citrinin production.

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      Combined effect of benzalkonium chloride and ultrasound against Listeria monocytogenes biofilm on plastic surface (pages 220–226)

      E. Torlak and D. Sert

      Version of Record online: 6 JUN 2013 | DOI: 10.1111/lam.12100

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      Significance and Impact of the Study: Listeria monocytogenes is capable of adhering and forming biofilm on inert surfaces such as plastics. Biofilms are more resistant to disinfectants compared to planktonic cells, and this makes their elimination from food processing facilities a big challenge. Moreover, the emergence of resistant to disinfectants bacteria clearly shows that new biofilm control strategies are required. Among new strategies, the ultrasound treatment attracts attention as a nonchemical and environmentally friendly technology. This study demonstrated that the combination of ultrasound and benzalkonium chloride is a feasible strategy for removal of L. monocytogenes biofilms from plastic food-contact surfaces.

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      Acetobacter strains isolated during the acetification of blueberry (Vaccinium corymbosum L.) wine (pages 227–232)

      C. Hidalgo, D. García, J. Romero, A. Mas, M.J. Torija and E. Mateo

      Version of Record online: 10 JUN 2013 | DOI: 10.1111/lam.12104

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      Significance and Impact of the Study: In this study, the Acetic Acid Bacteria population involved in blueberry vinegar production using Schützenbach method is first reported. Inoculation of an Acetobacter cerevisiae strain speeded up and conducted the process compared to spontaneous process. However, two genotypes of Acetobacter pasteurianus were also isolated in both processes (inoculated and spontaneous). These Acet. pasteurianus isolates can be exploited for studies of inoculation in vinegar production from blueberry or other raw material using Schützenbach method or other vinegar production methods.

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      A pentaplex PCR assay for detection and characterization of Vibrio vulnificus and Vibrio parahaemolyticus isolates (pages 233–240)

      N. Bhattacharyya and A. Hou

      Version of Record online: 13 JUN 2013 | DOI: 10.1111/lam.12101

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      Significance and Impact of the Study: This study, to the best of our knowledge, has been the first effort to develop a fast, cost-effective multiplex PCR (a pentaplex PCR termed pPCR) assay for simultaneous detection of bacterial isolates for pathogenic and nonpathogenic strains of Vibrio parahaemolyticus and Vibrio vulnificus. The fact that the assay can be applied to screen and characterize large numbers of bacterial isolates for the two most concerned Vibrio spp. from clinical/environmental samples will help detect pathogens, prevent disease outbreaks and plan better risk management strategies to protect public health.

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      Comparison of culture media for the recovery of airborne yeast in wineries (pages 241–248)

      E. Ocón, P. Garijo, P. Santamaría, R. López, C. Olarte, A.R. Gutiérrez and S. Sanz

      Version of Record online: 10 JUN 2013 | DOI: 10.1111/lam.12103

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      Significance and Impact of the Study: Estimating the important role of the air in wineries as a medium for disseminating both useful and potentially harmful yeasts requires the right approach. Except at very specific moments (vinification time), the number of yeasts present in the air are small, and they are normally stressed. In this study, the Chloramphenicol Glucose Agar (CGA) medium is recommended for estimating the number of yeasts present in the air, the Agar Lysine (AL) medium for assessing their diversity and the Dekkera-Brettanomyces Differential Medium (DBDM) for detecting the Brettanomyces genus.

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      Development of a carbohydrate-supplemented semidefined medium for the semiselective cultivation of Lactobacillus spp. (pages 249–257)

      R. Menon, M. Shields, T. Duong and J.M. Sturino

      Version of Record online: 12 JUN 2013 | DOI: 10.1111/lam.12106

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      Significance and Impact of the Study: The objective of this study was to develop a MRS-like semidefined medium with improved background coloration and the carbon-source supplemental properties of M17 broth to support the semiselective proliferation of fastidious lactobacilli. The resultant medium, MS, supported biomass accumulation at levels comparable with MRS; however, the new MS medium exhibited greater semiselectivity against non-Lactic Acid Bacteria than MRS. Together, these results suggest that MS is an acceptable alternative to MRS for use in metabolic and phenotypic bioassays, especially for those that use a colorimetric reporter system or would benefit from a semidefined nutrient composition.

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