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  Subjects -> BIOLOGY (Total: 3126 journals)
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BIOTECHNOLOGY (236 journals)                  1 2 | Last

Showing 1 - 200 of 239 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
Advanced Biomedical Research     Open Access  
Advances in Bioscience and Biotechnology     Open Access   (Followers: 16)
Advances in Genetic Engineering & Biotechnology     Hybrid Journal   (Followers: 7)
Advances in Regenerative Medicine     Open Access   (Followers: 2)
African Journal of Biotechnology     Open Access   (Followers: 6)
Algal Research     Partially Free   (Followers: 11)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 66)
American Journal of Bioinformatics Research     Open Access   (Followers: 7)
American Journal of Polymer Science     Open Access   (Followers: 32)
Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access  
Animal Biotechnology     Hybrid Journal   (Followers: 8)
Annales des Sciences Agronomiques     Full-text available via subscription  
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 43)
Applied Biosafety     Hybrid Journal  
Applied Food Biotechnology     Open Access   (Followers: 3)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 64)
Applied Mycology and Biotechnology     Full-text available via subscription   (Followers: 4)
Arthroplasty Today     Open Access   (Followers: 1)
Artificial Cells, Nanomedicine and Biotechnology     Hybrid Journal   (Followers: 1)
Asia Pacific Biotech News     Hybrid Journal   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Pacific Journal of Tropical Biomedicine     Open Access   (Followers: 2)
Australasian Biotechnology     Full-text available via subscription   (Followers: 1)
Banat's Journal of Biotechnology     Open Access  
BBR : Biochemistry and Biotechnology Reports     Open Access   (Followers: 5)
Beitr?ge zur Tabakforschung International/Contributions to Tobacco Research     Open Access   (Followers: 2)
Bio-Algorithms and Med-Systems     Hybrid Journal   (Followers: 2)
Bio-Research     Full-text available via subscription   (Followers: 3)
Bioactive Materials     Open Access   (Followers: 1)
Biocatalysis and Agricultural Biotechnology     Hybrid Journal   (Followers: 4)
Biocybernetics and Biological Engineering     Full-text available via subscription   (Followers: 5)
Bioethics UPdate     Hybrid Journal   (Followers: 1)
Biofuels     Hybrid Journal   (Followers: 11)
Biofuels Engineering     Open Access   (Followers: 1)
Biological & Pharmaceutical Bulletin     Full-text available via subscription   (Followers: 4)
Biological Cybernetics     Hybrid Journal   (Followers: 10)
Biomarkers and Genomic Medicine     Open Access   (Followers: 3)
Biomarkers in Drug Development     Partially Free   (Followers: 1)
Biomaterials Research     Open Access   (Followers: 4)
BioMed Research International     Open Access   (Followers: 4)
Biomédica     Open Access  
Biomedical and Biotechnology Research Journal     Open Access  
Biomedical Engineering Research     Open Access   (Followers: 6)
Biomedical Glasses     Open Access  
Biomedical Reports     Full-text available via subscription  
BioMedicine     Open Access  
Biomedika     Open Access  
Bioprinting     Hybrid Journal   (Followers: 1)
Bioresource Technology Reports     Hybrid Journal   (Followers: 1)
Bioscience, Biotechnology, and Biochemistry     Hybrid Journal   (Followers: 21)
Biosensors Journal     Open Access  
Biosimilars     Open Access   (Followers: 1)
Biosurface and Biotribology     Open Access  
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
BioTechniques : The International Journal of Life Science Methods     Full-text available via subscription   (Followers: 28)
Biotechnologia Acta     Open Access   (Followers: 1)
Biotechnologie, Agronomie, Société et Environnement     Open Access   (Followers: 2)
Biotechnology     Open Access   (Followers: 6)
Biotechnology & Biotechnological Equipment     Open Access   (Followers: 4)
Biotechnology Advances     Hybrid Journal   (Followers: 33)
Biotechnology and Applied Biochemistry     Hybrid Journal   (Followers: 44)
Biotechnology and Bioengineering     Hybrid Journal   (Followers: 154)
Biotechnology and Bioprocess Engineering     Hybrid Journal   (Followers: 5)
Biotechnology and Genetic Engineering Reviews     Hybrid Journal   (Followers: 13)
Biotechnology and Health Sciences     Open Access   (Followers: 1)
Biotechnology and Molecular Biology Reviews     Open Access   (Followers: 2)
Biotechnology Annual Review     Full-text available via subscription   (Followers: 5)
Biotechnology for Biofuels     Open Access   (Followers: 10)
Biotechnology Frontier     Open Access   (Followers: 2)
Biotechnology Journal     Hybrid Journal   (Followers: 16)
Biotechnology Law Report     Hybrid Journal   (Followers: 4)
Biotechnology Letters     Hybrid Journal   (Followers: 34)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Biotechnology Reports     Open Access  
Biotechnology Research International     Open Access   (Followers: 1)
Biotechnology Techniques     Hybrid Journal   (Followers: 10)
Biotecnología Aplicada     Open Access  
Bioteknologi (Biotechnological Studies)     Open Access  
BIOTIK : Jurnal Ilmiah Biologi Teknologi dan Kependidikan     Open Access  
Biotribology     Hybrid Journal   (Followers: 1)
BMC Biotechnology     Open Access   (Followers: 16)
Cell Biology and Development     Open Access  
Chinese Journal of Agricultural Biotechnology     Full-text available via subscription   (Followers: 4)
Communications in Mathematical Biology and Neuroscience     Open Access  
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computer Methods and Programs in Biomedicine     Hybrid Journal   (Followers: 8)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biotechnology     Hybrid Journal   (Followers: 20)
Crop Breeding and Applied Biotechnology     Open Access   (Followers: 3)
Current Bionanotechnology     Hybrid Journal  
Current Biotechnology     Hybrid Journal   (Followers: 4)
Current Opinion in Biomedical Engineering     Hybrid Journal   (Followers: 1)
Current Opinion in Biotechnology     Hybrid Journal   (Followers: 56)
Current Pharmaceutical Biotechnology     Hybrid Journal   (Followers: 9)
Current Research in Bioinformatics     Open Access   (Followers: 12)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Current trends in Biotechnology and Pharmacy     Open Access   (Followers: 8)
EBioMedicine     Open Access  
Electronic Journal of Biotechnology     Open Access  
Entomologia Generalis     Full-text available via subscription  
Environmental Science : Processes & Impacts     Full-text available via subscription   (Followers: 4)
Experimental Biology and Medicine     Hybrid Journal   (Followers: 3)
Folia Medica Indonesiana     Open Access  
Food Bioscience     Hybrid Journal  
Food Biotechnology     Hybrid Journal   (Followers: 9)
Food Science and Biotechnology     Hybrid Journal   (Followers: 8)
Frontiers in Bioengineering and Biotechnology     Open Access   (Followers: 6)
Frontiers in Systems Biology     Open Access   (Followers: 2)
Fungal Biology and Biotechnology     Open Access   (Followers: 2)
GM Crops and Food: Biotechnology in Agriculture and the Food Chain     Full-text available via subscription   (Followers: 1)
GSTF Journal of BioSciences     Open Access  
HAYATI Journal of Biosciences     Open Access  
Horticulture, Environment, and Biotechnology     Hybrid Journal   (Followers: 11)
IEEE Transactions on Molecular, Biological and Multi-Scale Communications     Hybrid Journal   (Followers: 1)
IET Nanobiotechnology     Hybrid Journal   (Followers: 2)
IIOAB Letters     Open Access  
IN VIVO     Full-text available via subscription   (Followers: 4)
Indian Journal of Biotechnology (IJBT)     Open Access   (Followers: 2)
Indonesia Journal of Biomedical Science     Open Access   (Followers: 2)
Indonesian Journal of Biotechnology     Open Access   (Followers: 1)
Indonesian Journal of Medicine     Open Access  
Industrial Biotechnology     Hybrid Journal   (Followers: 17)
International Biomechanics     Open Access  
International Journal of Bioinformatics Research and Applications     Hybrid Journal   (Followers: 13)
International Journal of Biomechatronics and Biomedical Robotics     Hybrid Journal   (Followers: 4)
International Journal of Biomedical Research     Open Access   (Followers: 2)
International Journal of Biotechnology     Hybrid Journal   (Followers: 5)
International Journal of Biotechnology and Molecular Biology Research     Open Access   (Followers: 3)
International Journal of Biotechnology for Wellness Industries     Partially Free   (Followers: 1)
International Journal of Environment, Agriculture and Biotechnology     Open Access   (Followers: 5)
International Journal of Functional Informatics and Personalised Medicine     Hybrid Journal   (Followers: 4)
International Journal of Medicine and Biomedical Research     Open Access   (Followers: 1)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 3)
International Journal of Radiation Biology     Hybrid Journal   (Followers: 4)
Iranian Journal of Biotechnology     Open Access  
ISABB Journal of Biotechnology and Bioinformatics     Open Access  
Italian Journal of Food Science     Open Access   (Followers: 1)
JMIR Biomedical Engineering     Open Access  
Journal of Biometrics & Biostatistics     Open Access   (Followers: 3)
Journal of Bioterrorism & Biodefense     Open Access   (Followers: 6)
Journal of Petroleum & Environmental Biotechnology     Open Access   (Followers: 1)
Journal of Advanced Therapies and Medical Innovation Sciences     Open Access  
Journal of Advances in Biotechnology     Open Access   (Followers: 5)
Journal Of Agrobiotechnology     Open Access  
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 7)
Journal of Animal Science and Biotechnology     Open Access   (Followers: 4)
Journal of Applied Biomedicine     Open Access   (Followers: 2)
Journal of Applied Biotechnology     Open Access   (Followers: 2)
Journal of Applied Biotechnology Reports     Open Access   (Followers: 2)
Journal of Applied Mathematics & Bioinformatics     Open Access   (Followers: 5)
Journal of Biologically Active Products from Nature     Hybrid Journal   (Followers: 1)
Journal of Biomaterials and Nanobiotechnology     Open Access   (Followers: 6)
Journal of Biomedical Photonics & Engineering     Open Access  
Journal of Biomedical Practitioners     Open Access  
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Bioprocessing & Biotechniques     Open Access  
Journal of Biosecurity Biosafety and Biodefense Law     Hybrid Journal   (Followers: 3)
Journal of Biotechnology     Hybrid Journal   (Followers: 64)
Journal of Biotechnology and Strategic Health Research     Open Access  
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 9)
Journal of Chitin and Chitosan Science     Full-text available via subscription   (Followers: 1)
Journal of Colloid Science and Biotechnology     Full-text available via subscription  
Journal of Commercial Biotechnology     Full-text available via subscription   (Followers: 6)
Journal of Crop Science and Biotechnology     Hybrid Journal   (Followers: 3)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Experimental Biology     Full-text available via subscription   (Followers: 25)
Journal of Genetic Engineering and Biotechnology     Open Access   (Followers: 5)
Journal of Ginseng Research     Open Access  
Journal of Industrial Microbiology and Biotechnology     Hybrid Journal   (Followers: 17)
Journal of Integrative Bioinformatics     Open Access  
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Molecular Biology and Biotechnology     Open Access  
Journal of Molecular Microbiology and Biotechnology     Full-text available via subscription   (Followers: 11)
Journal of Nano Education     Full-text available via subscription  
Journal of Nanobiotechnology     Open Access   (Followers: 4)
Journal of Nanofluids     Full-text available via subscription   (Followers: 1)
Journal of Organic and Biomolecular Simulations     Open Access  
Journal of Plant Biochemistry and Biotechnology     Hybrid Journal   (Followers: 4)
Journal of Science and Applications : Biomedicine     Open Access  
Journal of the Mechanical Behavior of Biomedical Materials     Hybrid Journal   (Followers: 12)
Journal of Trace Elements in Medicine and Biology     Hybrid Journal   (Followers: 1)
Journal of Tropical Microbiology and Biotechnology     Full-text available via subscription  
Journal of Yeast and Fungal Research     Open Access   (Followers: 1)
Marine Biotechnology     Hybrid Journal   (Followers: 4)
Meat Technology     Open Access  
Messenger     Full-text available via subscription  
Metabolic Engineering Communications     Open Access   (Followers: 4)
Metalloproteinases In Medicine     Open Access  
Microbial Biotechnology     Open Access   (Followers: 9)
MicroMedicine     Open Access   (Followers: 3)
Molecular and Cellular Biomedical Sciences     Open Access   (Followers: 1)
Molecular Biotechnology     Hybrid Journal   (Followers: 13)
Molecular Genetics and Metabolism Reports     Open Access   (Followers: 3)
Nanobiomedicine     Open Access  
Nanobiotechnology     Hybrid Journal   (Followers: 2)
Nanomaterials and Nanotechnology     Open Access  
Nanomedicine and Nanobiology     Full-text available via subscription  
Nanomedicine Research Journal     Open Access  

        1 2 | Last

Journal Cover
Applied Microbiology and Biotechnology
Journal Prestige (SJR): 1.182
Citation Impact (citeScore): 4
Number of Followers: 64  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1432-0614 - ISSN (Online) 0175-7598
Published by Springer-Verlag Homepage  [2350 journals]
  • Roles and applications of probiotic Lactobacillus strains
    • Authors: Zhongwang Zhang; Jianliang Lv; Li Pan; Yongguang Zhang
      Pages: 8135 - 8143
      Abstract: Abstract Lactobacilli are recognized as probiotics on account of their health-promoting effects in the host. The aim of this review is to summarize current knowledge of the mechanisms of the adaption factors and main functions of lactobacilli that exert health-promoting effects in the host and to discuss important applications in animal and human health. The adaption mechanisms of lactobacilli facilitate interactions with the host and directly contribute to the beneficial nutritional, physiological, microbiological, and immunological effects in the host. Besides, the application of probiotic lactobacilli will increase our understanding of practical uses based on the roles of these organisms in immunoregulation, antipathogenic activities, and enhancement of the epithelial barrier.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9217-9
      Issue No: Vol. 102, No. 19 (2018)
       
  • Recent progress on biological production of α-arbutin
    • Authors: Xingtong Zhu; Yuqing Tian; Wenli Zhang; Tao Zhang; Cuie Guang; Wanmeng Mu
      Pages: 8145 - 8152
      Abstract: Abstract Arbutin, a glucoside of hydroquinone, is used as a powerful skin lightening agent in the cosmeceutical industry because of its strong inhibitory effect on the human tyrosinase activity. It is a natural compound occurring in a number of plants, with a β-anomeric form of the glycoside bond between glucose and hydroquinone. α-Arbutin, which glycoside bond is generated with α-anomeric form, is the isomer of natural arbutin. α-Arbutin is generally produced by transglucosylation of hydroquinone by microbial glycosyltransferases. It is interesting that α-arbutin is found to be over 10 times more effective than arbutin, and thus biological production of α-arbutin attracts increasing attention. Seven different microbial enzymes have been identified to be able to produce α-arbutin, including α-amylase, sucrose phosphorlase, cyclodextrin glycosyltransferase, α-glucosidase, dextransucrase, amylosucrase, and sucrose isomerase. In this work, enzymatic and microbial production of α-arbutin is reviewed in detail.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9241-9
      Issue No: Vol. 102, No. 19 (2018)
       
  • Bacterial steroid hydroxylases: enzyme classes, their functions and
           comparison of their catalytic mechanisms
    • Authors: Maciej Szaleniec; Agnieszka M. Wojtkiewicz; Rita Bernhardt; Tomasz Borowski; Marina Donova
      Pages: 8153 - 8171
      Abstract: Abstract The steroid superfamily includes a wide range of compounds that are essential for living organisms of the animal and plant kingdoms. Structural modifications of steroids highly affect their biological activity. In this review, we focus on hydroxylation of steroids by bacterial hydroxylases, which take part in steroid catabolic pathways and play an important role in steroid degradation. We compare three distinct classes of metalloenzymes responsible for aerobic or anaerobic hydroxylation of steroids, namely: cytochrome P450, Rieske-type monooxygenase 3-ketosteroid 9α-hydroxylase, and molybdenum-containing steroid C25 dehydrogenases. We analyze the available literature data on reactivity, regioselectivity, and potential application of these enzymes in organic synthesis of hydroxysteroids. Moreover, we describe mechanistic hypotheses proposed for all three classes of enzymes along with experimental and theoretical evidences, which have provided grounds for their formulation. In case of the 3-ketosteroid 9α-hydroxylase, such a mechanistic hypothesis is formulated for the first time in the literature based on studies conducted for other Rieske monooxygenases. Finally, we provide comparative analysis of similarities and differences in the reaction mechanisms utilized by bacterial steroid hydroxylases.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9239-3
      Issue No: Vol. 102, No. 19 (2018)
       
  • Correction to: Bacterial steroid hydroxylases: enzyme classes, their
           functions and comparison of their catalytic mechanisms
    • Authors: Maciej Szaleniec; Agnieszka M. Wojtkiewicz; Rita Bernhardt; Tomasz Borowski; Marina Donova
      Pages: 8173 - 8173
      Abstract: The published online version contains mistake in the author list. The correct presentation should have been “Rita Bernhardt” instead of “Rita Bernhard”. There was a missing “t” on the original publication.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9320-y
      Issue No: Vol. 102, No. 19 (2018)
       
  • On the road towards tailor-made rhamnolipids: current state and
           perspectives
    • Authors: Andreas Wittgens; Frank Rosenau
      Pages: 8175 - 8185
      Abstract: Abstract Rhamnolipids are biosurfactants with an enormous potential to replace or complement classic surfactants in industrial applications. They consist of one or two L-rhamnose residues linked to one or two 3-hydroxyfatty acids of various chain lengths, which can also contain unsaturated carbon-carbon bonds, yielding a wide variety of different structures each with its specific physicochemical properties. Since different applications of surfactants require specific tenside characteristics related to surface tension reduction, emulsification, and foaming etc., rhamnolipids represent a platform molecule which harbors an enormous potential to adopt tailor-made properties to meet a huge variety of demands of surfactants for food-, healthcare-, and biotechnological applications. We are here giving an overview on current technology to synthesize tailor-made rhamnolipids based on the biotechnological use of different enzymes responsible for rhamnolipid biosynthesis originating from different naturally rhamnolipid-producing microorganism. Furthermore, we present future strategies to determine the number of L-rhamnose and 3-hydroxyfatty acids as well as their specific chain lengths and unsaturations to produce customized rhamnolipids perfectly tuned for every application.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9240-x
      Issue No: Vol. 102, No. 19 (2018)
       
  • Current understanding of sulfur assimilation metabolism to biosynthesize l
           -cysteine and recent progress of its fermentative overproduction in
           microorganisms
    • Authors: Yusuke Kawano; Kengo Suzuki; Iwao Ohtsu
      Pages: 8203 - 8211
      Abstract: Abstract To all organisms, sulfur is an essential and important element. The assimilation of inorganic sulfur molecules such as sulfate and thiosulfate into organic sulfur compounds such as l-cysteine and l-methionine (essential amino acid for human) is largely contributed by microorganisms. Of these, special attention is given to thiosulfate (S2O32−) assimilation, because thiosulfate relative to often utilized sulfate (SO42−) as a sulfur source is proposed to be more advantageous in microbial growth and biotechnological applications like l-cysteine fermentative overproduction toward industrial manufacturing. In Escherichia coli as well as other many bacteria, the thiosulfate assimilation pathway is known to depend on O-acetyl-l-serine sulfhydrylase B. Recently, another yet-unidentified CysM-independent thiosulfate pathway was found in E. coli. This pathway is expected to consist of the initial part of the thiosulfate to sulfite (SO32−) conversion, and the latter part might be shared with the final part of the known sulfate assimilation pathway [sulfite → sulfide (S2−) → l-cysteine]. The catalysis of thiosulfate to sulfite is at least partly mediated by thiosulfate sulfurtransferase (GlpE). In this mini-review, we introduce updated comprehensive information about sulfur assimilation in microorganisms, including this topic. Also, we introduce recent advances of the application study about l-cysteine overproduction, including the GlpE overexpression.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9246-4
      Issue No: Vol. 102, No. 19 (2018)
       
  • From radioactive ligands to biosensors: binding methods with olfactory
           proteins
    • Authors: Paolo Pelosi; Jiao Zhu; Wolfgang Knoll
      Pages: 8213 - 8227
      Abstract: Abstract In this paper, we critically review the binding protocols currently reported in the literature to measure the affinity of odorants and pheromones to soluble olfactory proteins, such as odorant-binding proteins (OBPs), chemosensory proteins (CSPs) and Niemann-Pick class C2 (NPC2) proteins. The first part contains a brief introduction on the principles of binding and a comparison of the techniques adopted or proposed so far, discussing advantages and problems of each technique, as well as their suitable application to soluble olfactory proteins. In the second part, we focus on the fluorescent binding assay, currently the most widely used approach. We analyse advantages and drawbacks, trying to identify the causes of anomalous behaviours that have been occasionally observed, and suggest how to interpret the experimental data when such events occur. In the last part, we describe the state of the art of biosensors for odorants, using soluble olfactory proteins immobilised on biochips, and discuss the possibility of using such approach as an alternative way to measure binding events and dissociation constants.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9253-5
      Issue No: Vol. 102, No. 19 (2018)
       
  • Metabolic engineering of Clostridium acetobutylicum for the production of
           butyl butyrate
    • Authors: Hyeon Ji Noh; Ji Eun Woo; Sang Yup Lee; Yu-Sin Jang
      Pages: 8319 - 8327
      Abstract: Abstract Butyl butyrate is widely used as a fragrance additive for foods and beverages. The first step in the currently used process is the production of precursors, including butanol and butyrate, from petroleum using chemical catalysts, followed by the conversion of precursors to butyl butyrate by immobilized lipase. In this work, we engineered Clostridium acetobutylicum for the selective, one-step production of butyl butyrate from glucose. C. acetobutylicum ATCC 824, possessing a strong carbon flux that yields butanol and butyryl-CoA, was selected as a host and was engineered by introducing alcohol acyltransferases (AATs) from Fragaria x ananassa (strawberry) or Malus sp. (apple). Batch culture of the engineered C. acetobutylicum strain CaSAAT expressing the strawberry SAAT gene produced 50.07 mg/L of butyl butyrate with a selectivity of 84.8% of total esters produced. Also, the engineered C. acetobutylicum strain CaAAAT expressing the apple AAAT gene produced 40.60 mg/L of butyl butyrate with a selectivity of 87.4%. This study demonstrated the feasibility of the one-step fermentation of butyl butyrate from glucose in the engineered C. acetobutylicum, as a proof of concept.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9267-z
      Issue No: Vol. 102, No. 19 (2018)
       
  • A novel β-propeller phytase from the dioxin-degrading bacterium
           Sphingomonas wittichii RW-1
    • Authors: Anna Maria Sanangelantoni; Marina Malatrasi; Elisa Trivelloni; Giovanna Visioli; Caterina Agrimonti
      Pages: 8351 - 8358
      Abstract: Abstract β-propeller phytase-like sequences (BPP-like sequences) are widespread in the microbial world and have been found in the sequenced genomes of aquatic, soil, and plant bacteria. Exploring NCBI microbial genome database for putative genes encoding phytase, a BPP-like sequence from Sphingomonas wittichii RW-1 (Sequence ID: CP000699.1), known for its capacity of degrading polychlorinated dibenzo-p-dioxins and dibenzofurans, was recognized. The putative phytase gene (phySw) was amplified with specific primers, cloned, and overexpressed in Escherichia coli and the catalytic properties of the recombinant PhySw protein were analyzed. The results show that phySw encodes an enzyme with the properties of β-propeller phytases: it requires the presence of Ca2+ ions, it is optimally active at 55 °C, and it has a pH optimum of 6.0 with good activity in the range 6.0–8.0. Furthermore, the enzyme exhibits a good thermostability, recovering 68% of its original activity after treatment at 80 °C for 10 min, and shows a good substrate specificity for phytic acid. These properties render this enzyme a candidate as an animal feed additive (e.g., for aquaculture industry). The isolation of phytases from a hydrocarbon-utilizing microorganism also opens new scenarios for their possible application in combating oil pollution.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9248-2
      Issue No: Vol. 102, No. 19 (2018)
       
  • Immune responses induced by recombinant Lactobacillus plantarum expressing
           the spike protein derived from transmissible gastroenteritis virus in
           piglets
    • Authors: Yu-Bei Jin; Wen-Tao Yang; Chun-Wei Shi; Bo Feng; Ke-Yan Huang; Guang-Xun Zhao; Qiong-Yan Li; Jing Xie; Hai-Bin Huang; Yan-Long Jiang; Jian-Zhong Wang; Guan Wang; Yuan-Huan Kang; Gui-Lian Yang; Chun-Feng Wang
      Pages: 8403 - 8417
      Abstract: Abstract Transmissible gastroenteritis coronavirus (TGEV) is one of the most severe threats to the swine industry. In this study, we constructed a suite of recombinant Lactobacillus plantarum with surface displaying the spike (S) protein coming from TGEV and fused with DC cells targeting peptides (DCpep) to develop an effective, safe, and convenient vaccine against transmissible gastroenteritis. Our research results found that the recombinant Lactobacillus plantarum (NC8-pSIP409-pgsA-S-DCpep) group expressing S fused with DCpep could not only significantly increase the percentages of MHC-II+CD80+ B cells and CD3+CD4+ T cells but also the number of IgA+ B cells and CD3+CD4+ T cells of ileum lamina propria, which elevated the specific secretory immunoglobulin A (SIgA) titers in feces and IgG titers in serum. Taken together, these results suggest that NC8-pSIP409-pgsA-S-DCpep expressing the S of TGEV fused with DCpep could effectively induce immune responses and provide a feasible original strategy and approach for the design of TGEV vaccines.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9205-0
      Issue No: Vol. 102, No. 19 (2018)
       
  • Heterologous AdpA transcription factors enhance landomycin production in
           Streptomyces cyanogenus S136 under a broad range of growth conditions
    • Authors: Oleksandr Yushchuk; Iryna Ostash; Iryna Vlasiuk; Tetiana Gren; Andriy Luzhetskyy; Joern Kalinowski; Victor Fedorenko; Bohdan Ostash
      Pages: 8419 - 8428
      Abstract: Abstract Streptomyces cyanogenus S136 is the only known producer of landomycin A (LaA), one of the largest glycosylated angucycline antibiotics possessing strong antiproliferative properties. There is rising interest in elucidation of mechanisms of action of landomycins, which, in turn, requires access to large quantities of the pure compounds. Overproduction of LaA has been achieved in the past through manipulation of cluster-situated regulatory genes. However, other components of the LaA biosynthetic regulatory network remain unknown. To fill this gap, we elucidated the contribution of AdpA family pleiotropic regulators in landomycin production via expression of adpA genes of different origins in S. cyanogenus S136. Overexpression of the native S. cyanogenus S136 adpA ortholog had no effect on landomycin titers. In the same time, expression of several heterologous adpA genes led to significantly increased landomycin production under different cultivation conditions. Hence, heterologous adpA genes are a useful tool to enhance or activate landomycin production by S. cyanogenus. Our ongoing research effort is focused on identification of mutations that render S. cyanogenus AdpA nonfunctional.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9249-1
      Issue No: Vol. 102, No. 19 (2018)
       
  • A new approach for detection and quantification of microalgae in
           industrial-scale microalgal cultures
    • Authors: Peter Beatrice-Lindner; Jose Antonio Garrido-Cardenas; Claudia Sepulveda; Francisco Gabriel Acien-Fernandez
      Pages: 8429 - 8436
      Abstract: Abstract In industrial-scale microalgal cultures, non-target microalgae compete with the desired species for nutrients and CO2, thus reducing the growth rate of the target species and the quality of the produced biomass. Microalgae identification is generally considered a complicated issue; although, in the last few years, new molecular methods have helped to rectify this problem. Among the different techniques available, DNA barcoding has proven very useful in providing rapid, accurate, and automatable species identification; in this work, it is used to assess the genomic identity of the microalga species Scenedesmus sp. ‘almeriensis’, a common strain in industrial-scale cultures. Barcode markers rbcL and ITS1-5.8S-ITS2 were sequenced and the obtained genomic information was used to design a quantitative PCR assay to precisely quantify the S. almeriensis concentration in microalgal cultures of industrial interest. TaqMan chemistry was used to quantify down to 1 μg/L dry weight of S. almeriensis cells, including in the presence of concentrated mixed cultures of other microalgae. A simple direct qPCR approach was also investigated to avoid classic DNA extraction and to reduce total assay time to approximately 2 h. The objective was to design strain-specific tools able to confirm and quantify the presence of different strains in whatever microalgae culture so as to achieve maximal productivity and quality of the produced biomass.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9268-y
      Issue No: Vol. 102, No. 19 (2018)
       
  • Engineering Salinispora tropica for heterologous expression of natural
           product biosynthetic gene clusters
    • Authors: Jia Jia Zhang; Bradley S. Moore; Xiaoyu Tang
      Pages: 8437 - 8446
      Abstract: Abstract The marine actinomycete genus Salinispora is a remarkably prolific source of structurally diverse and biologically active secondary metabolites. Herein, we select the model organism Salinispora tropica CNB-440 for development as a heterologous host for the expression of biosynthetic gene clusters (BGCs) to complement well-established Streptomyces host strains. In order to create an integratable host with a clean background of secondary metabolism, we replaced three genes (salA–C) essential for salinosporamide biosynthesis with a cassette containing the Streptomyces coelicolor ΦC31 phage attachment site attB to generate the mutant S. tropica CNB-4401 via double-crossover recombination. This mutagenesis not only knocks-in the attachment site attB in the genome of S. tropica CNB-440 but also abolishes production of the salinosporamides, thereby simplifying the strain’s chemical background. We validated this new heterologous host with the successful integration and expression of the thiolactomycin BGC that we recently identified in several S. pacifica strains. When compared to the extensively engineered superhost S. coelicolor M1152, the production of thiolactomycins from S. tropica CNB-4401 was approximately 3-fold higher. To the best of our knowledge, this is the first example of using a marine actinomycete as a heterologous host for natural product BGC expression. The established heterologous host may provide a useful platform to accelerate the discovery of novel natural products and engineer biosynthetic pathways.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9283-z
      Issue No: Vol. 102, No. 19 (2018)
       
  • Imaging mass spectrometry-guided fast identification of antifungal
           secondary metabolites from Penicillium polonicum
    • Authors: Jing Bai; Peng Zhang; Guanhu Bao; Jin-Gang Gu; Lida Han; Li-Wen Zhang; Yuquan Xu
      Pages: 8493 - 8500
      Abstract: Abstract The discovery of antibiotics from microorganisms using classic bioactivity screens suffers from heavy labor and high re-discovery rate. Recently, largely uncovered biosynthetic potentials were unveiled by new approaches, such as genetic manipulation of “silent” biosynthetic gene clusters, innovative data acquisition, and processing methods. In this work, a fast and efficient antibiotic identification pipeline based on the MALDI-TOF imaging mass spectrometry was applied to study the antifungal metabolites during the confrontation of two fungal species, Penicillium polonicum and wilt-inducing fungus Fusarium oxysporum. By visualizing the spatial distribution of metabolites directly on the microbial colony and surrounding media, we predicted the antifungal candidates before isolating pure compounds and individually testing their bioactivity, which subsequently guided the identification of target molecules using classic chromatographic methods. Via this procedure, we successfully identified two antifungal metabolites, fructigenine A and B, which belong to indole alkaloid class and were not reported for antifungal activity. Our work assigned new bioactivity to previously reported compounds and more importantly showed the efficiency of this approach towards quick discovery of bioactive compounds, which can help study the vast unexploited synthetic potential of microbial secondary metabolites.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9218-8
      Issue No: Vol. 102, No. 19 (2018)
       
  • Analytical impact of Metschnikowia pulcherrima in the volatile profile of
           Verdejo white wines
    • Authors: Javier Ruiz; Ignacio Belda; Beata Beisert; Eva Navascués; Domingo Marquina; Fernando Calderón; Doris Rauhut; Antonio Santos; Santiago Benito
      Pages: 8501 - 8509
      Abstract: Abstract Most wine aroma compounds, including the varietal fraction, are produced or released during wine production and derived from microbial activity. Varietal aromas, typically defined as terpenes and thiols, have been described as derived from their non-volatile precursors, released during wine fermentation by different yeast hydrolytic enzymes. The perception of these minority aroma compounds depends on the chemical matrix of the wine, especially on the presence of majority aroma compounds, such as esters or higher alcohols. Strategies aiming to reduce the production of these masking flavors are on the spotlight of enology research as a way to better define varietal standard profiles for the global market. Using a natural white must from Verdejo variety (defined as a thiol grape variety), here we describe the analytical and sensorial impact of using, in sequential inoculations, a selected strain of Metschnikowia pulcherrima, in combination with two different Saccharomyces cerevisiae strains. An increase in the levels of the thiol 4-MSP (4-methyl-4-sulfanylpentan-2-one) over its sensory threshold, together with a decrease in higher alcohol production, was observed when M. pulcherrima was used. This has an important impact on these wines, making them fruitier and fresher, always preferred by the sensory panel.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9255-3
      Issue No: Vol. 102, No. 19 (2018)
       
  • Medium chain unsaturated fatty acid ethyl esters inhibit persister
           formation of Escherichia coli via antitoxin HipB
    • Authors: Mengya Wang; Kuili Fang; Sung Min Choi Hong; Inwha Kim; Ik-Soon Jang; Seok Hoon Hong
      Pages: 8511 - 8524
      Abstract: Abstract Persisters represent a small bacterial population that is dormant and that survives under antibiotic treatment without experiencing genetic adaptation. Persisters are also considered one of the major reasons for recalcitrant chronic bacterial infections. Although several mechanisms of persister formation have been proposed, it is not clear how cells enter the dormant state in the presence of antibiotics or how persister cell formation can be effectively controlled. A fatty acid compound, cis-2-decenoic acid, was reported to decrease persister formation as well as revert the dormant cells to a metabolically active state. We reasoned that some fatty acid compounds may be effective in controlling bacterial persistence because they are known to benefit host immune systems. This study investigated persister cell formation by pathogens that were exposed to nine fatty acid compounds during antibiotic treatment. We found that three medium chain unsaturated fatty acid ethyl esters (ethyl trans-2-decenoate, ethyl trans-2-octenoate, and ethyl cis-4-decenoate) decreased the level of Escherichia coli persister formation up to 110-fold when cells were exposed to ciprofloxacin or ampicillin antibiotics. RNA sequencing analysis and gene deletion persister studies elucidated that these fatty acids inhibit bacterial persistence by regulating antitoxin HipB. A similar persister cell reduction was observed for pathogenic E. coli EDL933, Pseudomonas aeruginosa PAO1, and Serratia marcescens ICU2-4 strains. This study demonstrates that fatty acid ethyl esters can be used to disrupt bacterial dormancy to combat persistent infectious diseases.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9271-3
      Issue No: Vol. 102, No. 19 (2018)
       
  • Identification and characterisation of short chain rhamnolipid production
           in a previously uninvestigated, non-pathogenic marine pseudomonad
    • Authors: Matthew S. Twigg; L. Tripathi; A. Zompra; K. Salek; V. U. Irorere; T. Gutierrez; G. A. Spyroulias; R. Marchant; I. M. Banat
      Pages: 8537 - 8549
      Abstract: Abstract This study aimed to identify and characterise biosurfactant compounds produced by bacteria associated with a marine eukaryotic phytoplankton bloom. One strain, designated MCTG214(3b1), was isolated by enrichment with polycyclic aromatic hydrocarbons and based on 16S rDNA, and gyrB sequencing was found to belong to the genus Pseudomonas, however not related to P. aeruginosa. Cell-free supernatant samples of strain MCTG214(3b1) at stationary phase showed significant reductions in surface tension. HPLC-MS and NMR analysis of these samples indicated the presence of five different rhamnolipid (RL) congeners. Di-rhamnolipids accounted for 87% relative abundance and all congeners possessed fatty acid moieties consisting of 8–12 carbons. PCR screening of strain MCTG214(3b1) DNA revealed homologues to the P. aeruginosa RL synthesis genes rhlA and rhlB; however, no rhlC homologue was identified. Using the Galleria mellonella larvae model, strain MCTG214(3b1) was demonstrated to be far less pathogenic than P. aeruginosa. This study identifies for the first time a significantly high level of synthesis of short chain di-rhamnolipids by a non-pathogenic marine Pseudomonas species. We postulate that RL synthesis in Pseudomonas sp. MCTG214(3b1) is carried out by enzymes expressed from rhlA/B homologues similar to those of P. aeruginosa; however, a lack of rhlC potentially indicates the presence of a second novel rhamnosyltransferase responsible for the di-rhamnolipid congeners identified by HPLC-MS.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9202-3
      Issue No: Vol. 102, No. 19 (2018)
       
  • Diversity and community structure of ammonia oxidizers in a marsh wetland
           of the northeast China
    • Authors: Dawen Gao; Fengqin Liu; Lu Li; Chuhong Chen; Hong Liang
      Pages: 8561 - 8571
      Abstract: Abstract As an interface of terrestrial and aquatic ecosystems, wetland is a hotspot of the global nitrogen cycle. Ammonia oxidation is an essential part of the nitrogen cycle and is conducted by ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB). Based on the amoA gene, the distribution and genetic diversity of AOA and AOB in the marsh wetland soil with different soil layers and vegetation had been investigated. The result showed that both soil layer and vegetation significantly influenced the diversity and abundance of AOA and AOB. AOB dominated numerically in all soil samples. The average bacterial amoA gene copies (2.62 × 109 copies/g dry soil) was 100-fold higher than the average archaeal amoA gene copies. In the soil sample under the Phragmites australis, the highest archaeal amoA gene was in depth 20–40 cm, whereas the bacterial amoA gene was more abundant in depth 0–20 cm. For the soil under Calamagrostis angustifolia, the highest archaeal and bacterial amoA gene were both detected in depth 0–20 cm. The dominated AOA was cluster AII, which was most related to the amoA gene found in aquatic habitat. Cluster BI accounted for 59.1% of bacterial amoA gene and it was related to the amoA gene found in the terrestrial habitat. CCA analysis revealed that NO3− was the main factor for AOA and AOB community structure in the P. australis soil. However, NO2− and NH4+ were important factors for AOA and AOB in the soil under C. angustifolia.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9225-9
      Issue No: Vol. 102, No. 19 (2018)
       
  • Microbiota assemblages of water, sediment, and intestine and their
           associations with environmental factors and shrimp physiological health
    • Authors: Fei Huang; Luqing Pan; Mengsi Song; Changcheng Tian; Shuo Gao
      Pages: 8585 - 8598
      Abstract: Abstract Microorganisms play crucial roles in nutrient cycling, water quality maintenance, and farmed animal health. Increasing evidences have revealed a close association between unstable microbial environments and disease occurrences in aquaculture. Thereupon, we used high-throughput sequencing technology to comprehensively compare the bacterial communities of water, sediment, and intestine in mariculture ponds at the middle and late stages of Litopenaeus vannamei farming and analyzed whether changes of their microbiota assemblages were associated with environmental factors and shrimp physiological health. Results showed that bacterial community structures were significantly distinct among water, sediment, and intestine; meanwhile, the relative abundances of intestinal dominant taxa were significantly changed between different rearing stages. Compared with intestine and water, shrimp intestine and sediment had a similar profile of the dominant bacterial genera by cluster analysis, and the observed species, diversity indexes, and shared OTUs of bacterial communities in intestine and sediment were simultaneously increased after shrimp were farmed for 90 days. These results reflected a closer relationship between microbiotas in sediment and intestine, which was further proved by nonmetric multidimensional scaling analysis. However, bacterial communities in water, sediment, and intestine responded differently to environmental variables by redundancy and correlation analysis. More importantly, shrimp physiological parameters were closely associated with bacterial variations in the gut and/or ambient, especially the gut microbiota owning significantly high levels of predicted functional pathways involved in disease emergence. These findings may greatly add to our understanding of the microbiota characteristics of the shrimp pond ecosystem and the complex interactions among shrimp, ambient microflora, and environmental variables.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9229-5
      Issue No: Vol. 102, No. 19 (2018)
       
  • Microbial community composition and diversity in rice straw digestion
           bioreactors with and without dairy manure
    • Authors: A. M. Zealand; R. Mei; P. Papachristodoulou; A. P. Roskilly; W. T. Liu; David W. Graham
      Pages: 8599 - 8612
      Abstract: Abstract Anaerobic digestion (AD) uses a range of substrates to generate biogas, including energy crops such as globally abundant rice straw (RS). Unfortunately, RS is high in lignocellulosic material and has high to C:N ratios (~80:1), which makes it (alone) a comparatively poor substrate for AD. Co-digestion with dairy manure (DM) has been promoted as a method for balancing C:N ratios to improve RS AD whilst also treating another farm waste and co-producing a potentially useful fertiliser. However, past co-digestion studies have not directly compared RS AD microbial communities with and without DM additions, which has made it hard to assess all impacts of DM addition to RS AD processes. Here, four RS:DM ratios were contrasted in identical semi-continuous-fed AD bioreactors, and 100% RS was found to produce the highest specific methane yields (112 mL CH4/g VS/day; VS, volatile solids), which is over double yields achieved in the reactor with the highest DM content (30:70 RS:DM by mass; 48 mL CH4/g VS/day). To underpin these data, microbial communities were sequenced and characterised across the four reactors. Dominant operational taxonomic units (OTUs) in the 100% RS unit were Bacteroidetes/Firmicutes, whereas the 30:70 RS:DM unit was dominated by Proteobacteria/Spirochaetes, suggesting major microbial community shifts occur with DM additions. However, community richness was lowest with 100% RS (despite higher specific yields), suggesting particular OTUs may be more important to yields than microbial diversity. Further, ambient VFA and VS levels were significantly higher when no DM was added, suggesting DM-amended reactors may cope better with higher organic loading rates (OLR). Results show that RS AD without DM addition is feasible, although co-digestion with DM will probably allow higher OLRs, resulting in great RS throughput in farm AD units.
      PubDate: 2018-10-01
      DOI: 10.1007/s00253-018-9243-7
      Issue No: Vol. 102, No. 19 (2018)
       
 
 
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