Biocontrol science Journal Impact Factor & Information

Publisher: Nihon Bōkin Bōbai Gakkai

Journal description

Current impact factor: 1.31

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 1.312
2012 Impact Factor 0.604
2011 Impact Factor 0.778
2010 Impact Factor 0.625

Impact factor over time

Impact factor
Year

Additional details

5-year impact 0.00
Cited half-life 4.70
Immediacy index 0.08
Eigenfactor 0.00
Article influence 0.00
Website Biocontrol Science website
Other titles Biocontrol science
ISSN 1342-4815
OCLC 37579252
Material type Periodical
Document type Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: A novel competition model for describing bacterial growth in mixed culture was developed in this study. Several model candidates were made with our logistic growth model that precisely describes the growth of a monoculture of bacteria. These candidates were then evaluated for the usefulness in describing growth of two competing species in mixed culture using Staphylococcus aureus, Escherichia coli, and Salmonella. Bacterial cells of two species grew at initial doses of 10(3), 10(4), and 10(5) CFU/g at 28ºC. Among the candidates, a model where the Lotka-Volterra model, a general competition model in ecology, was incorporated as a new term in our growth model was the best for describing all types of growth of two competitors in mixed culture. Moreover, the values for the competition coefficient in the model were stable at various combinations of the initial populations of the species. The Baranyi model could also successfully describe the above types of growth in mixed culture when it was coupled with the Gimenez and Dalgaard model. However, the values for the competition coefficients in the competition model varied with the conditions. The present study suggested that our model could be a basic model for describing microbial competition.
    Biocontrol science 01/2014; 19(2):61-71. DOI:10.4265/bio.19.61
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    ABSTRACT: Prediction of microbial growth in mixed culture was studied with a competition model that we had developed recently. The model, which is composed of the new logistic model and the Lotka-Volterra model, is shown to successfully describe the microbial growth of two species in mixed culture using Staphylococcus aureus, Escherichia coli, and Salmonella. With the parameter values of the model obtained from the experimental data on monoculture and mixed culture with two species, it then succeeded in predicting the simultaneous growth of the three species in mixed culture inoculated with various cell concentrations. To our knowledge, it is the first time for a prediction model for multiple (three) microbial species to be reported. The model, which is not built on any premise for specific microorganisms, may become a basic competition model for microorganisms in food and food materials.
    Biocontrol science 01/2014; 19(2):89-92. DOI:10.4265/bio.19.89
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    ABSTRACT: The aim of this study was to evaluate the synergistic effect of two formulated biofungicides (Rhizoleen-T and Rhizoleen-B) in the suppression of root and bottom rot of lettuce caused by Rhizoctonia solani, as well as the consequent effect on the phytosanitarian status of the plants.The results proved that application of the biofungicides either singly or in combination increased the germination and survival of the lettuce up to 61.67% and 100%, respectively. The phytosanitarian status of the plants, which was indicated by morphological and physiological parameters, was improved as the result of the application of the biofungicides. The noteworthy valuable result was the increase in fresh weight by 52.5% of the control when the two biofungicides were applied as a mixture. Interestingly, the mixture of the two biofungicides brought about a significant increase in most parameters compared to either of them in single preparation. Proline and phenols significantly increased as a result of the application of the biofungicides compared to the control. This means that the treated plants were more resistant against the pathogens. The study concludes that application of the biofungicides protects the lettuce plants against root and bottom rot, and in addition they increase the strength of the defense system of the plants. It is recommended that the application of a biofungicide mixture is a good and effective strategy in the biocontrol of plant diseases.
    Biocontrol science 01/2014; 19(4):189-97. DOI:10.4265/bio.19.189
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    ABSTRACT: A total of 140 samples of dried food sold in Japan were surveyed and tested for the presence of viable bacteria, distribution of coliform bacteria, and contamination with Cronobacter spp. The samples were purchased from retail stores in Tokyo and Kanagawa Prefecture. Out of the 140 samples tested, viable bacteria were found in 135 samples and coliform bacteria were found in 23 samples. Qualitative and quantitative testing revealed the presence of Cronobacter spp. in 35 (25.0%) and 11 samples (7.9%), respectively. The most commonly found Cronobacter species were C. sakazakii, with the next most common, in order, being C. muytjensii and C. turicensis. The actual numbers of Cronobacter species in the tested dried foods were low, but the widespread contamination particularly in dried herbs and vegetables was confirmed.
    Biocontrol science 01/2014; 19(4):209-13. DOI:10.4265/bio.19.209
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    ABSTRACT: Effects of surface contamination and cleaning with hypochlorite wipes on the antibacterial activity of copper-alloyed stainless steel were studied. The antibacterial activity of copper alloyed stainless steel decreased with the increase in the amount of surface contaminant, and the bacterial counts from specimens contaminated with a contaminant, e.g. 1.6 × 10(-2) μg/mm(2) of bovine serum albumin, were not significantly different from those from ordinary stainless steel specimens. The once contaminated surface could regain its antibacterial activity when it was sufficiently wiped clean with sterile wipes loaded with sodium hypochlorite solution.
    Biocontrol science 01/2014; 19(2):73-8. DOI:10.4265/bio.19.73
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    ABSTRACT: The present study evaluates the feasibility of using Artemia franciscana in reducing the Ni concentration of synthetic wastewater by the process of bioaccumulation. Metallothionein protein plays a key role in the uptake of nickel by Artemia. Artemia (Brine shrimp) was exposed to an initial nickel concentration of 40 mg/L. Gradual decrease of nickel was observed from 40 mg/L to 5 mg/L with a removal efficiency of 87.5%. The number of organisms were varied to determine the number for the maximum removal efficiency. Metallothionein protein in Artemia was estimated by the silver saturation method. The physical parameters such as pH were maintained in an alkaline condition of 9-10, temperature was maintained at room temperature and salinity at 30-35‰. These were found to be the optimal conditions for the survival and reduction of nickel by Artemia.
    Biocontrol science 01/2014; 19(2):79-84. DOI:10.4265/bio.19.79
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    ABSTRACT: The status of Enterobacteriaceae contamination was investigated in a total of 131 samples of raw horsemeat (Basashi) intended for human consumption purchased from a general meat shop or by mail-order from October 2012 to December 2013. The bacteria were isolated from 105 of the 112 samples (93.8%). Prominent differences in the isolation rate due to the place of manufacture/sale or by the cut of the meat were not observed. Moreover, in a comparison between domestic (92.6%) and imported (100%) samples, the isolation rate was slightly higher in the imported samples. When Enterobacteriaceae isolated from raw horsemeat was identified, it was highly diverse, with 14 species identified in total. From among these species, Hafnia alvei was the most common, with 33 strains (19.8%),followed by 27 strains (16.2%) of Klebsiella pneumoniae and 26 strains (15.6%) of Enterobacter cloacae, indicating that these three species were dominant. A trend was observed, with the dominant strain differing depending on the place of manufacture/sale or the cut of the meat. H. alvei was isolated at an especially high frequency from imported samples. An investigation was carried out regarding raw horsemeat intended for human consumption from Yamanashi Prefecture and Canada, regularly purchased from one store in Kanagawa Prefecture. Enterobacteriaceae were isolated during five of nine (55.6%) trials, in which the isolated bacteria were H. alvei, K. pneumoniae, etc. Moreover, they were isolated at a very high isolation rate of seven among 10 trials for the Canadian meat, and H. alvei was the most commonly isolated bacteria. Accordingly, when an investigation was carried out regarding the differences in the strain level in the six isolates of H. alvei periodically isolated from raw horsemeat from Canada by the pulsed-field gel electrophoresis (PFGE) pattern using a restriction enzyme, SfiI, there was a possibility that these were the same H-38 strain (November 2013) and H-64 strain (April 2014) as well as the same H-104 strain (July 2014) and H-131 strain (December 2014). As mentioned above, it has been demonstrated that a variety of Enterobacteriaceae were isolated from raw horsemeat (Basashi) intended for human consumption, and at a high frequency. Moreover, based on the fact that the same species or strain was chronologically isolated, the possibility of contamination by the same contamination source at different times was suggested.
    Biocontrol science 01/2014; 19(4):181-8. DOI:10.4265/bio.19.181
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    ABSTRACT: We offer the first description of the development of a multiple detection technique for fungi by DNA microarray with the simultaneous use of internal transcribed spacer region (ITS) of ribosomal RNA gene and β-tubulin gene probes. The assay uses 12 oligonucleotide probes and multiplex amplification to detect fungal species belonging to various sections of Aspergillus, the Eurotium genus, and the Penicillium genus. The specificity of each probe was tested using 231 reference fungal strains, including 79 target and 152 non-target strains in 102 species of 24 genera. We determined the optimum concentration of the primer pairs for multiplex PCR to be 0.5 μM for the β-tubulin gene and 0.125 μM for the ITS region. In the field trial using 76 specimens containing 323 fungi (up to five fungal strains were included in one specimen), the concordance rate between the DNA microarray and the DNA sequencing results was 97.4% at the species or genus levels.
    Biocontrol science 01/2014; 19(3):139-45. DOI:10.4265/bio.19.139
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    ABSTRACT: The immunochromatographic assay, which targets Shiga toxin 1/verotoxin 1 (VT1) and/or Shiga toxin 2/verotoxin 2 (VT2) independently with same test device, was used for easily, rapidly and specifically detecting verotoxin-producing Escherichia coli among E. coli strains from food and fecal materials. All 10 strains of VT 1 and/or VT 2- producing E. coli among E. coli isolates from various sources showed a positive reaction to VT1- or VT2- antibodies, but other gram-negative and positive bacterial species had a negative reaction. Bacterial counts of 10(8) cfu/ml in enrichment broth and food suspension were required for the detection of VT-producing E. coli. The IC assay described here could detect easily and specifically the verotoxin-producing E. coli within 20 min by pure culture.
    Biocontrol science 01/2014; 19(4):205-8. DOI:10.4265/bio.19.205
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    ABSTRACT: The adequacy of the consume-by date was validated for rice balls sold at convenience stores (CVSs),taking into account the process of distribution. The results indicated that the increase in the viable cell counts differed significantly depending on the type of rice balls and the storage temperature. At 19 h after delivery, Staphylococcus spp. were detected in 4 samples (26.7%) of the Tunamayo samples of Company A and in the majority of the Plum samples of Company B. Results showed there was a strong correlation between the elapsed time after delivery and the viable cell counts for all samples except for the Plum samples of Company B. The regression equations varied for the different types of rice balls and the different storage temperatures. Using the obtained regression equations and assuming a safety factor of 0.7, the appropriate consume-by date was determined to be 11 h for the Tunamayo and 38 h for the Plum of Company A, and 21 h for the Tunamayo of Company B. Among 14 strains of isolated Gram-negative bacteria, 11 strains (78.6%) belonged to the genus Serratia.
    Biocontrol science 01/2014; 19(4):165-71. DOI:10.4265/bio.19.165
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    ABSTRACT: Of human pathogenic Vibrio species, V. mimicus causes gastroenteritis whereas V. vulnificus causes fatal septicemia after consumption of contaminated seafood. These two pathogens produce hemolytic toxins termed V. mimicus hemolysin (VMH) and V. vulnificus hemolysin (VVH), respectively. These toxins elicit the cytolysis of various eukaryotic cells, as well as erythrocytes. The human intestine secretes cationic antimicrobial peptides (AMPs) to prevent infectious diseases. Paneth cells in the small intestine secrete α-defensin 5 (HD-5) and epithelial cells in the large intestine produce LL-37. In the present study, we examined the bactericidal activities of AMPs against V. mimicus and V. vulnificus. Although HD-5 showed no bactericidal activity, LL-37 revealed significant activity against both Vibrio species, suggesting that neither V. mimicus nor V. vulnificus can multiply in the large intestine. We also tested whether AMPs had the ability to inactivate the hemolytic toxins. Only HD-5 was found to inactivate VMH, but not VVH, in a dose-dependent manner through the direct binding to VMH. Therefore, it is considered that V. mimicus cannot penetrate the small intestinal epithelium because the cytolytic action of VMH is inactivated by HD-5.
    Biocontrol science 01/2014; 19(4):199-203. DOI:10.4265/bio.19.199
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    ABSTRACT: Alicyclobacillus acidoterrestris, an obligate aerobe and one of the most harmful bacteria in acidic beverages, requires oxygen for growth. However, the relationship between oxygen availability and its growth has not yet been quantified. We examined the correlation between A. acidoterrestris growth and oxygen availability to determine whether A. acidoterrestris can be controlled by restricting oxygen. Airtight containers were filled with YSG broth and apple juice at various oxygen concentrations. Positive correlation (R(2)=0.9329) was observed between A. acidoterrestris growth and oxygen availability in YSG broth, and a lower but nonetheless slight correlation (R(2)=0.5604) was observed for apple juice. These results indicate that decreased oxygen availability in a container could restrict growth. As results, the addition of reducing compounds along with airtight conditions may help prevent the deterioration of beverages caused by the proliferation of A. acidoterrestris.
    Biocontrol science 01/2014; 19(2):85-8. DOI:10.4265/bio.19.85
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    ABSTRACT: Molecular display techniques using microbial cell surfaces have been widely developed in the past twenty years, and are useful tools as whole cell catalysts for various applications such as bioconversion, bioremediation, biosensing, and the screening system of protein libraries. Furthermore, different types of microbial cells among eukaryotic and prokaryotic strains have been investigated for their use in surface display technologies. Recently, several kinds of protein-displaying yeasts have been utilized as bioadsorbents in this platform technology. In particular, these trials have successfully expanded the possibility of applications to metal binding, affinity purification, and receptor-ligand interaction by using the yeast cell surface. In this mini review, we describe the general principles of molecular display technology using yeast cells and its applications, with a particular focus on bioadsorption.
    Biocontrol science 01/2014; 19(4):157-64. DOI:10.4265/bio.19.157
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    ABSTRACT: A novel competition model developed with the new logistic model and the Lotka-Volterra model successfully predicted the growth of bacteria in mixed culture using the mesophiles Staphylococcus aureus, Escherichia coli, and Salmonella at a constant temperature in our previous studies. In this study, we further studied the prediction of the growth of those bacteria in mixed culture at dynamic temperatures with various initial populations with the competition model. First, we studied the growth kinetics of the species in a monoculture at various constant temperatures ranging from 16℃ to 32℃. With the analyzed data in the monoculture, we then examined the prediction of bacterial growth in mixed culture with two and three species. The growth of the bacteria in the mixed culture at dynamic temperatures was successfully predicted with the model. The residuals between the observed and predicted populations at the data points were <0.5 log at most points, being 83.3% and 84.2% for the two-species mixture and the three-species mixture, respectively. The present study showed that the model could be applied to the competitive growth in mixed culture at dynamic temperature patterns.
    Biocontrol science 01/2014; 19(3):121-7. DOI:10.4265/bio.19.121
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    ABSTRACT: We examined amino acid requirements for the growth of the halotolerant Brevibacterium sp. JCM 6894 in the absence and presence of 1.2 M NaCl in a chemically defined medium. The experiment was also carried out in the presence of 1.2 M KCl. As a result, growth was highly enhanced by methionine in the absence and presence of KCl as well as NaCl up to 1.2 M. However, growth in the presence of 150 mM methionine was repressed by leucine (up to 100 mM) and valine (up to 100 mM). Concentration-dependent growth inhibition was observed in the presence of isoleucine (up to 150 mM) and threonine (up to 300 mM). When the cells were incubated in the absence of externally added K(+), growth was strongly repressed, even in the presence of 150 mM methionine. The growth, however, recovered drastically by the addition of 1 mM KCl, regardless of the presence and absence of 1.2 M NaCl. These results indicate that methionine, which seems to be symported into cytoplasm with K(+), plays an important role in the growth of the strain under salt stress.
    Biocontrol science 01/2014; 19(3):151-5. DOI:10.4265/bio.19.151
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    ABSTRACT: We have previously conducted a microflora analysis and examined the biofilm-forming activity of bacteria isolated from toilet bowl biofilms. In the present investigation, to reveal the strain involved in the formation of black dirt in toilet bowls, we performed a microflora analysis of the bacteria and fungi isolated from the black dirt of toilet bowls at ten homes. Among samples from different isolation sites and sampling seasons, although a similar tendency was not seen in bacterial microflora, Exophiala sp. was detected in the fungal microflora from all samples of black dirt except for one, and constituted the major presence. By scanning electron microscope (SEM) analysis of the formed black dirt, SEM image at × 1,000 and × 5,000 magnification showed objects like hyphae and many bacteria adhering to them, respectively. Micro fourier transform infrared spectroscopy (micro FT-IR) and SEM with X-ray microanalysis (SEM-XMA) were used to investigate the components of black dirt. IR spectra of micro-FT-IR showed typical absorptions associated with amide compounds and protein, and the elements such as C, N, O, Na, Mg, Al, Si, P, S, K, and Ba were detected with SEM-XMA. These results showed that black dirt had living body ingredients. Furthermore, Exophiala sp. and Cladosporium sp. strains, which were observed at a high frequency, accumulated 2-hydroxyjuglone (2-HJ) and flaviolin as one of the intermediates in the melanin biosynthetic pathway by the addition of a melanin synthesis inhibitor (tricyclazole) at the time of cultivation. These results suggested strongly that the pigment of black dirt in toilet bowls was melanin produced by Exophiala sp. and Cladosporium sp. strains.
    Biocontrol science 01/2014; 19(4):173-9. DOI:10.4265/bio.19.173
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    ABSTRACT: Scanning electron microscopy revealed that the rpoS-deficient cells of E. coli K-12 BW25113 (ΔrpoS) increased the number of flagella on the cell surfaces. However, the quantitative analysis of cell colonization showed that the increased number of flagella on ΔrpoS cell surfaces did not cause the enhancement of cell colonization on the surfaces of polyvinyl chloride (PVC), polypropylene (PP) and polystyrene (PS) after 24 h of incubation at 37℃. To facilitate the enhanced expression of curli, the csgA gene was introduced into the ΔrpoS cells. The transformed cells rich in flagella and curli on the cell surfaces were found to make colonies 2-3 times larger than both the wild type and ΔrpoS cells on the PVC, PP and PS surfaces at 37℃. It was thus verified that the reinforcement of csgA gene in the ΔrpoS cells induced the enhanced colonization on the solid surfaces with the increased flagellum and curli expressions.
    Biocontrol science 01/2014; 19(3):147-50. DOI:10.4265/bio.19.147
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    ABSTRACT: Gas plasma generated and applied under two different systems, atmospheric pressure plasma and low pressure plasma, was used to investigate the inactivation efficacy on the seedborne pathogenic fungus, Rhizoctonia solani, which had been artificially introduced to brassicaceous seeds. Treatment with atmospheric plasma for 10 min markedly reduced the R. solani survival rate from 100% to 3% but delayed seed germination. The low pressure plasma treatment reduced the fungal survival rate from 83% to 1.7% after 10 min and the inactivation effect was dependent on the treatment time. The seed germination rate after treatment with the low pressure plasma was not significantly different from that of untreated seeds. The air temperature around the seeds in the low pressure system was lower than that of the atmospheric system. These results suggested that gas plasma treatment under low pressure could be effective in disinfecting the seeds without damaging them.
    Biocontrol science 01/2014; 19(2):99-102. DOI:10.4265/bio.19.99