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  Subjects -> BIOLOGY (Total: 3193 journals)
    - BIOCHEMISTRY (242 journals)
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    - BIOLOGY (1526 journals)
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    - BIOTECHNOLOGY (244 journals)
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BIOTECHNOLOGY (244 journals)                  1 2 | Last

Showing 1 - 200 of 244 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
Advanced Biomedical Research     Open Access  
Advances in Bioscience and Biotechnology     Open Access   (Followers: 17)
Advances in Genetic Engineering & Biotechnology     Hybrid Journal   (Followers: 9)
Advances in Regenerative Medicine     Open Access   (Followers: 3)
African Journal of Biotechnology     Open Access   (Followers: 6)
Algal Research     Partially Free   (Followers: 11)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 69)
American Journal of Bioinformatics Research     Open Access   (Followers: 7)
American Journal of Polymer Science     Open Access   (Followers: 33)
Amylase     Open Access  
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: 45)
Applied Biosafety     Hybrid Journal  
Applied Food Biotechnology     Open Access   (Followers: 3)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 67)
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: 3)
Bio-Algorithms and Med-Systems     Hybrid Journal   (Followers: 2)
Bio-Research     Full-text available via subscription   (Followers: 4)
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)
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: 8)
Biotechnology & Biotechnological Equipment     Open Access   (Followers: 4)
Biotechnology Advances     Hybrid Journal   (Followers: 34)
Biotechnology and Applied Biochemistry     Hybrid Journal   (Followers: 44)
Biotechnology and Bioengineering     Hybrid Journal   (Followers: 159)
Biotechnology and Bioprocess Engineering     Hybrid Journal   (Followers: 6)
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: 17)
Biotechnology Law Report     Hybrid Journal   (Followers: 4)
Biotechnology Letters     Hybrid Journal   (Followers: 34)
Biotechnology Progress     Hybrid Journal   (Followers: 41)
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: 17)
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: 55)
Current Pharmaceutical Biotechnology     Hybrid Journal   (Followers: 9)
Current Research in Bioinformatics     Open Access   (Followers: 13)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Current trends in Biotechnology and Pharmacy     Open Access   (Followers: 8)
DNA and RNA Nanotechnology     Open Access  
EBioMedicine     Open Access  
Electronic Journal of Biotechnology     Open Access  
Entomologia Generalis     Full-text available via subscription   (Followers: 1)
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  
Horticultural Biotechnology Research     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)
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: 18)
International Biomechanics     Open Access  
International Journal of Bioinformatics Research and Applications     Hybrid Journal   (Followers: 14)
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: 4)
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 BioScience and Biotechnology     Open Access  
Journal of Biosecurity Biosafety and Biodefense Law     Hybrid Journal   (Followers: 3)
Journal of Biotechnology     Hybrid Journal   (Followers: 63)
Journal of Biotechnology and Strategic Health Research     Open Access   (Followers: 1)
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 Ecobiotechnology     Open Access  
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: 18)
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: 13)
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: 13)
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: 10)
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)

        1 2 | Last

Journal Cover
Biotechnology Letters
Journal Prestige (SJR): 0.621
Citation Impact (citeScore): 2
Number of Followers: 34  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-6776 - ISSN (Online) 0141-5492
Published by Springer-Verlag Homepage  [2352 journals]
  • MiR-429 improved the hypoxia tolerance of human amniotic cells by
           targeting HIF-1α
    • Authors: Lihao Ge; Yuyan Wang; Yang Cao; Gang Li; Rui Sun; Peng Teng; Yansong Wang; Yunlong Bi; Zhanpeng Guo; Yajiang Yuan; Deshui Yu
      Pages: 1477 - 1486
      Abstract: MicroRNA-429(miR-429) plays an important role in mesenchymal stem cells. Hypoxia-inducible factor 1α (HIF-1α) is a nuclear transcription factor that regulates the proliferation, apoptosis and tolerance to hypoxia of mesenchymal stem cells. HIF-1α is also a target gene of miR-429. We investigated whether miR-429 plays a role in hypoxia tolerance with HIF-1α in human amniotic mesenchymal stem cells (hAMSCs). The expression of miR-429 was increased by hypoxia in hAMSCs. miR-429 expression resulted in decreased HIF-1α protein level, but little effect on HIF-1α mRNA. While overexpression of HIF-1α increased the survival rate and exhibited anti-apoptosis effects in hAMSCs under hypoxia, co-expression of miR-429 reduced survival and increased apoptosis. However, miR-429 silencing with HIF-1α overexpression stimulated cell survival and reduced apoptosis. Co-expression of HIF-1α and miR-429 reduced VEGF and Bcl-2 proteins and increased Bax and C-Caspase-3 levels in hAMSCs under hypoxia compared with cells expressing only HIF-1α; cells with HIF-1α overexpression and miR-429 silencing showed the opposite effects. These results indicate that HIF-1α and angomiR-429 reciprocally antagonized each other, while HIF-1α and antagomiR-429 interacted with each other to regulate survival and apoptosis in hAMSCs under hypoxia. miR-429 increased VEGF and Bcl-2 protein levels and decreased Bax and cleaved Caspase-3 protein levels by promoting the synthesis of HIF-1α. These results indicate that miR-429 negatively regulates the survival and anti-apoptosis ability of hAMSCs by mediating HIF-1α expression and improves the ability of hAMSCs to tolerate hypoxia.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2604-6
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Cell culture medium supplemented with taurine decreases basic charge
           variant levels of a monoclonal antibody
    • Authors: Mengjuan Liu; Jiaqi Wang; Hongping Tang; Li Fan; Liang Zhao; Hai-Bin Wang; Yan Zhou; Wen-Song Tan
      Pages: 1487 - 1493
      Abstract: Objective To explore the impact of taurine on monoclonal antibody (mAb) basic charge variants in Chinese hamster ovary (CHO) cell culture. Results In fed-batch culture, adding taurine in the feed medium slightly increased the maximum viable cell density and mAb titers in CHO cells. What’s more, taurine significantly decreased the lysine variant and oxidized variant levels, which further decreased basic variant contents from 32 to 27%. The lysine variant content in the taurine culture was approximately 4% lower than that in control condition, which was the main reason for the decrease in basic variants. Real-time PCR and cell-free assay revealed that taurine played a critical role in the upregulation of relative basic carboxypeptidase and stimulating extracellular basic carboxypeptidase activities. Conclusion Taurine exhibits noticeable impact on lower basic charge variants, which are mainly due to the decrease of lysine variant and oxidized protein variants.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2606-4
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Establishment of a HEK293 cell line by CRISPR/Cas9-mediated luciferase
           knock-in to study transcriptional regulation of the human SREBP1 gene
    • Authors: Zihang Li; Junli Zhao; Niaz Muhammad; Dongyang Wang; Qinwen Mao; Haibin Xia
      Pages: 1495 - 1506
      Abstract: Objectives To establish a HEK293 cell line with a luciferase knock-in reporter controlled by the endogenous SREBP1 promoter for investigating transcriptional regulation of the SREBP1 gene. Results PCR confirmed the site-specific integration of a single copy of the exogenous luciferase gene into one allele of the genome and a 14 bp deletion of the targeted sequence in the other. Luciferase activity was directly correlated with the promoter activity of the endogenous SREBP1 gene in the HEK293-SREBP1-T2A-luciferase-KI cell line cell line. Conclusions We successfully generated a novel luciferase knock-in reporter system, which will be very useful for studying transcriptional regulation of the SREBP1 gene and for screening drugs or chemical molecules that regulate SREBP1 gene expression.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2608-2
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Generation of Cas9 transgenic zebrafish and their application in
           establishing an ERV-deficient animal model
    • Authors: Zhe Yang; Shihao Chen; Songlei Xue; Xinxiu Li; Zhen Sun; Yu Yang; Xuming Hu; Tuoyu Geng; Hengmi Cui
      Pages: 1507 - 1518
      Abstract: Objectives To investigate the effect of endogenous Cas9 on genome editing efficiency in transgenic zebrafish. Results Here we have constructed a transgenic zebrafish strain that can be screened by pigment deficiency. Compared with the traditional CRISPR injection method, the transgenic zebrafish can improve the efficiency of genome editing significantly. At the same time, we first observed that the phenotype of vertebral malformation in early embryonic development of zebrafish after ZFERV knockout. Conclusions The transgenic zebrafish with expressed Cas9, is more efficient in genome editing. And the results of ZFERV knockout indicated that ERV may affect the vertebral development by Notch1/Delta D signal pathway.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2605-5
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Mining of Egypt’s Red Sea invertebrates for potential bioactive
           producers
    • Authors: Hala S. Helal; Amro Hanora; Rania Abdelmonem Khattab; Hayam Hamouda; Hamdallah Zedan
      Pages: 1519 - 1530
      Abstract: Objective The objective of this work was to isolate bacteria from Red Sea invertebrates, determine their antimicrobial activity, and screen for the biosynthetic gene clusters [polyketides (PKs) and nonribosomal peptides (NRPs)] which could be involved in the production of bioactive secondary metabolites. Result Eleven different samples of marine invertebrates’ were collected from Egypt’s Red Sea (El-Tor-Sharm El-Sheikh and Hurghada) by scuba diving, and a total 80 isolates of the associated microorganisms were obtained from the cultivation on six different cultural medium. Seven isolates of them showed an antimicrobial activity against five pathogenic reference strains, while the most active antimicrobial agent was isolate number HFF-8 which was 99% identical to Bacillus amyloliquefaciens. HFF-8’s extract showed positive results against Gram negative bacteria, Gram positive bacteria and yeast. Moreover, the isolates gave positive bands when screened for the presence of PK synthase (PKS) I and II and NRP synthetase (NRPS) I and II biosynthetic genes, those biosynthetic fragments when cloned and sequenced were primitively predicted as biosynthetic fragments for kirromycin and leinamycin production by NaPDoS program with 56 and 55%, respectively. Conclusion The Red Sea can provide a sustainable solution to combat bacterial resistance. The contribution of this work is that B. amyloliquefaciens was isolated from Heteroxenia fuscescens, Red Sea, Egypt. Moreover, the bacterial extract showed a broad spectrum with a potent antimicrobial activity.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2600-x
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Co-synthesis of kenyacin 404 and heterologous thurincin H enhances the
           antibacterial activity of Bacillus thuringiensis
    • Authors: Zuleyka S. Oros-Flores; Luz E. Casados-Vázquez; Dennis K. Bideshi; Rubén Salcedo-Hernández; José E. Barboza-Corona
      Pages: 1531 - 1540
      Abstract: Objectives To develop a recombinant strain of Bacillus thuringiensis that synthesizes two bacteriocins that enhance the antibacterial potency of the strain and that could have applied clinical and industrial value. Results We cloned the thurincin H cluster into the pHT3101 vector by assembling two genetic cassettes harboring genes for the synthesis, modification, immunity and transport of thurincin H. This construct was used to transform a thurincin H-sensitive strain of B. thuringiensis that synthesizes the kenyacin 404 to generate the recombinant Btk 404/pThurH which was immune to thurincin H and produces bacteriocins of approximately 3 kDa. A significant increase in the inhibitory activity, respectively, ~ 40 and 300%, was observed when compared with parental Btm 269 and Btk 404. Btk 404/pThurH showed increased activity against ten Gram-positive bacteria, including B. cereus, Listeria monocytogenes and B. pseudomycoides, and the Gram-negative bacterium, Sphingobacterium cabi. However, an antagonistic effect against Vibrio parahaemolyticus, relative to native strains, was observed. Conclusions We have generated a recombinant strain of B. thuringiensis that co-synthesizes two bacteriocins (kenyacin 404, thurincin H) with improved inhibitory activity, when compared with parental strains. To our knowledge, this is the first study that shows that B. thuringiensis could be manipulated to produce two bacteriocins, one being of heterologous origin, that enhance the antibacterial activity of the recombinant strain.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2601-9
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Improved nucleic acid extraction protocols for Ganoderma boninense , G.
           miniatocinctum and G. tornatum
    • Authors: Jayanthi Nagappan; Chiew Foan Chin; Lee Pei Lee Angel; Richard M. Cooper; Sean T. May; Eng-Ti Leslie Low
      Pages: 1541 - 1550
      Abstract: The first and most crucial step of all molecular techniques is to isolate high quality and intact nucleic acids. However, DNA and RNA isolation from fungal samples are usually difficult due to the cell walls that are relatively unsusceptible to lysis and often resistant to traditional extraction procedures. Although there are many extraction protocols for Ganoderma species, different extraction protocols have been applied to different species to obtain high yields of good quality nucleic acids, especially for genome and transcriptome sequencing. Ganoderma species, mainly G. boninense causes the basal stem rot disease, a devastating disease that plagues the oil palm industry. Here, we describe modified DNA extraction protocols for G. boninense, G. miniatocinctum and G. tornatum, and an RNA extraction protocol for G. boninense. The modified salting out DNA extraction protocol is suitable for G. boninense and G. miniatocinctum while the modified high salt and low pH protocol is suitable for G. tornatum. The modified DNA and RNA extraction protocols were able to produce high quality genomic DNA and total RNA of ~ 140 to 160 µg/g and ~ 80 µg/g of mycelia respectively, for Single Molecule Real Time (PacBio Sequel® System) and Illumina sequencing. These protocols will benefit those studying the oil palm pathogens at nucleotide level.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2603-7
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Increased productivity of l -2-aminobutyric acid and total turnover number
           of NAD + /NADH in a one-pot system through enhanced thermostability of l
           -threonine deaminase
    • Authors: Ying Wang; Guo-Si Li; Pei Qiao; Ling Lin; Hai-Long Xue; Li Zhu; Mian-Bin Wu; Jian-Ping Lin; Li-Rong Yang
      Pages: 1551 - 1559
      Abstract: Objective To strengthen NADH regeneration in the biosynthesis of l-2-aminobutyric acid (l-ABA). Results l-Threonine deaminase (l-TD) from Escherichia coli K12 was modified by directed evolution and rational design to improve its endurance to heat treatment. The half-life of mutant G323D/F510L/T344A at 42 °C increased from 10 to 210 min, a 20-fold increase compared to the wild-type l-TD, and the temperature at which the activity of the enzyme decreased by 50% in 15 min increased from 39 to 53 °C. The mutant together with thermostable l-leucine dehydrogenase from Bacillus sphaericus DSM730 and formate dehydrogenase from Candida boidinii constituted a one-pot system for l-ABA biosynthesis. Employing preheat treatment in the one-pot system, the biosynthesis of l-ABA and total turnover number of NAD+/NADH were 0.993 M and 16,469, in contrast to 0.635 M and 10,531 with wild-type l-TD, respectively. Conclusions By using the engineered l-TD during endured preheat treatment, the one-pot system has achieved a higher productivity of l-ABA and total turnover number of coenzyme.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2607-3
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Overproduction of rhamnolipids in Pseudomonas aeruginosa PA14 by
           redirection of the carbon flux from polyhydroxyalkanoate synthesis and
           overexpression of the rhlAB - R operon
    • Authors: Uriel Gutiérrez-Gómez; Martín P. Soto-Aceves; Luis Servín-González; Gloria Soberón-Chávez
      Pages: 1561 - 1566
      Abstract: Objective To construct Pseudomonas aeruginosa PA14 derivatives that overproduce rhamnolipids (RL) by blocking the synthesis of the carbon-storage polymer polyhydroxyalkanoates (PHA) and by overexpressing the rhlAB-R operon that encodes for enzymes of RL synthesis and the RhlR transcriptional regulator. Results In contrast to previous results showing that overexpression of rhlAB-R genes in two P. aeruginosa strains (PAO1 and ATCC 9027) is sufficient to overproduce RL, we show that a PA14 derivative overexpressing the rhlAB-R operon did not increase the synthesis of these biosurfactants. In addition, PA14 mutants deficient in PHA production did not overproduce RL either. However, if the rhlAB-R genes were expressed in a mutant that is completely impaired in PHA synthesis, a significant increase in RL production was observed (59%). These results show that RL production in PA14 is limited both by the availability of fatty acid precursors and by the levels of the RhlA and RhlB enzymes that are involved in the synthesis of mono-RL. Conclusions The limitation of RL production by P. aeruginosa PA14 is multifactorial and diverse from the results obtained with other strains. Thus, the factors that limit RL production are particular to each P. aeruginosa strain, so strain-specific strategies should be developed to increase their production.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2610-8
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Evaluation of the mass transfer rate using computer simulation in a
           three-dimensional interwoven hollow fiber-type bioartificial liver
    • Authors: Ryoichi Sakiyama; Hiroyuki Hamada; Brandon Blau; Nora Freyer; Katrin Zeilinger; Frank Schubert; Toshio Miki
      Pages: 1567 - 1578
      Abstract: Objectives To determine the most efficient design of a hollow fiber-based bioreactor device for a bioartificial liver support system through comparative bioengineering evaluations. Results We compared two types of hollow fiber-based bioreactors, the interwoven-type bioreactor (IWBAL) and the dialyzer-type bioreactor (DBAL), by evaluating the overall mass transfer coefficient (K) and the convective coefficient (X). The creatinine and albumin mass transfer coefficients and convective coefficients were calculated using our mathematical model based on the homoporous theory and the modified Powell method. Additionally, using our model, we simulated the mass transport efficiency in clinical-scale BALs. The results of this experiment demonstrate that the mass transfer coefficients for creatinine and albumin increased proportionally with velocity with the IWBAL, and were consistently greater than that found with the DBAL. These differences were further enhanced in the simulation of the large-scale model. Conclusions Our findings indicate that the IWBAL with its unique 30° cross hollow fiber design can provide greater solute removal and more efficient metabolism when compared to the conventional DBAL design.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2609-1
      Issue No: Vol. 40, No. 11-12 (2018)
       
  • Chemical transformation mediated CRISPR/Cas9 genome editing in Escherichia
           coli
    • Abstract: Objectives To develop a convenient chemical transformation mediated CRISPR/Cas9 (CT-CRISPR/Cas9) system for genome editing in Escherichia coli. Results Here, we have constructed a CT-CRISPR/Cas9 system, which can precisely edit bacterial genome (replacing, deleting, inserting or point mutating a target gene) through chemical transformation. Compared with the traditional electroporation mediated CRISPR/Cas9 (ET-CRISPR/Cas9) system, genome editing with the CT-CRISPR/Cas9 system is much cheaper and simpler. In the CT-CRISPR/Cas9 system, we observed efficient genome editing on LB-agar plates. The CT-CRISPR/Cas9 system has successfully modified the target gene with the editing template flanked by short homologous DNA fragments (~ 50 bp) which were designed in primers. We used the lab-made CaCl2 solution to perform the CT-CRISPR/Cas9 experiment and successfully edited the genome of E. coli. Potential application of the CT-CRISPR/Cas9 system in high-throughput genome editing was evaluated in two E. coli strains by using a multiwell plate. Conclusions Our work provides a simple and cheap genome-editing method, that is expected to be widely applied as a routine genetic engineering method.
      PubDate: 2018-12-13
       
  • Progress in antibiotic susceptibility tests: a comparative review with
           special emphasis on microfluidic methods
    • Abstract: Antibiotic susceptibility test (AST) is an umbrella term for techniques to determine the susceptibility of bacteria to antibiotics. The antibiotic-resistant bacteria are a major threat to public health and a directed therapy based on accurate AST results is paramount in resistance control. Here we have briefly covered the progress of conventional, molecular, and automated AST tools and their limitations. Various aspects of microfluidic AST such as optical, electrochemical, colorimetric, and mechanical methods have been critically reviewed. We also address the future requirements of the microfluidic devices for AST. Cumulatively, we have outlined the overview of AST that can help to expand and improve the existing techniques and emphasize that microfluidics could be the future of AST and introduction of microtechnologies in AST will be extremely advantageous, especially for point-of-care testing.
      PubDate: 2018-12-12
       
  • The marine Gram-negative bacterium Novosphingobium sp. PP1Y as a potential
           source of novel metabolites with antioxidant activity
    • Abstract: Objective The antioxidant activity and protective effect of a methanolic extract obtained from the marine Gram-negative bacterium Novosphingobium sp. PP1Y, isolated from the surface water of a polluted area in the harbour of Pozzuoli (Naples, Italy), was evaluated. Results The extract was tested in vitro on epithelial colorectal adenocarcinoma cells and in vivo on Caenorhabditis elegans. It showed strong protective activity against oxidative stress, in both experimental systems, by preventing ROS accumulation. In the case of the cells, pre-treatment with methanolic extract was also able to maintain unaltered intracellular GSH levels and phosphorylation levels of mitogen-activated protein kinases p38. Instead, in the case of the worms, the extract was able to modulate the expression levels of stress response genes, by activating the transcription factor skn-1. Conclusions From a biotechnological and economical point of view, antioxidants from microorganisms are convenient as they provide a valid alternative to chemical synthesis and respond to the ever-growing market demand for natural antioxidants.
      PubDate: 2018-12-12
       
  • Oligosaccharides as co-encapsulating agents: effect on oral Lactobacillus
           fermentum survival in a simulated gastrointestinal tract
    • Authors: Ning Liao; Baolong Luo; Jing Gao; Xiaojuan Li; Zhixia Zhao; Yan Zhang; Yongqing Ni; Fengwei Tian
      Abstract: Objectives Four kinds of oligosaccharides were used as co-encapsulating agents to test the effect of extrusion-based microencapsulation on protection of Lactobacillus fermentum L7 against exposure to simulated gastric and intestinal juices as well as long-term refrigeration storage at 4 °C. Results The combination of alginate with galacto-oligosaccharides, isomalto-oligosaccharides, fructo-oligosaccharides, and xylo-oligosaccharides, or alginate alone exhibited good properties of the beads. The diameters of the cell beads co-encapsulated with oligosaccharides and encapsulated with alginate alone were similar, in the range of 2.34–2.51 mm. However, the encapsulation yield of L. fermentum cells co-encapsulated with oligosaccharides, which was in the range of 79.52–89.75%, was significantly higher than that of cells encapsulated with alginate alone. The capsules were stable in gastric conditions and can disintegrated when exposed to intestinal conditions. Additionally, the viability of microencapsulated cells after exposure to the simulated gastric and intestinal juices as well as long-term refrigeration storage was better than that of free cells, and the viability of cells co-encapsulated with oligosaccharides was better than that of cells encapsulated with alginate alone. Furthermore, fructo-oligosaccharides used as co-encapsulating agent showed the best performance. Conclusions Microencapsulating L. fermentum with oligosaccharides protected cells well at a low temperature and offered effective gastrointestinal delivery of probiotics, and thus has the potential to maintain bacterial survival in probiotic products and will provide the research basis for design of effective probiotic-prebiotic combinations to maximize host benefit.
      PubDate: 2018-12-10
      DOI: 10.1007/s10529-018-02634-6
       
  • Solvent stable microbial lipases: current understanding and
           biotechnological applications
    • Authors: Priyanka Priyanka; Yeqi Tan; Gemma K. Kinsella; Gary T. Henehan; Barry J. Ryan
      Abstract: Objective This review examines on our current understanding of microbial lipase solvent tolerance, with a specific focus on the molecular strategies employed to improve lipase stability in a non-aqueous environment. Results It provides an overview of known solvent tolerant lipases and of approaches to improving solvent stability such as; enhancing stabilising interactions, modification of residue flexibility and surface charge alteration. It shows that judicious selection of lipase source supplemented by appropriate enzyme stabilisation, can lead to a wide application spectrum for lipases. Conclusion Organic solvent stable lipases are, and will continue to be, versatile and adaptable biocatalytic workhorses commonly employed for industrial applications in the food, pharmaceutical and green manufacturing industries.
      PubDate: 2018-12-07
      DOI: 10.1007/s10529-018-02633-7
       
  • Comparative features between recombinant lipases CALA- like from U. maydis
           and CALA from C. antarctica in thermal stability and selectivity
    • Authors: Marcela Robles-Machuca; M. Martin del Campo; M. Ángeles Camacho-Ruiz; Enrique Ordaz; Edgar O. Zamora-González; Marcelo Müller-Santos; Jorge A. Rodríguez
      Abstract: Objectives Ustilago maydis lipase A (UMLA) expressed in Pichia pastoris was compared with Candida antarctica lipase A (CALA) to study its biochemical properties such as thermostability and selectivity. Results UMLA had similar behavior to its homologue CALA regarding the effect of pH and temperature on enzymatic activity, substrate preference and selectivity. Both lipases were active on insoluble triglycerides as well as natural oils and hydrolyzed preferably esters with short and medium acyl and alkyl chains. Both enzymes were slightly selective for the (S)-glycidyl butyrate enantiomer and had a remarkable preference for the sn-2 position of triglycerides. The optimal activity was 40 and 50 °C for UMLA and CALA, respectively. However, temperature had a greater effect on the stability of UMLA compared to CALA, observing a half-life at 50 °C of 2.07 h and 12.83 h, respectively. Conclusions UMLA shares some biochemical properties with CALA such as the sn-2 preference on triglyceride hydrolysis and transesterification. However, the high thermostability attributed to CALA was not observed in UMLA; this can be due to the lack of stabilization via AXXXA motifs in helices and fewer proline residues at the surface.
      PubDate: 2018-12-05
      DOI: 10.1007/s10529-018-2630-4
       
  • Green asymmetric reduction of acetophenone derivatives: Saccharomyces
           cerevisiae and aqueous natural deep eutectic solvent
    • Authors: Manuela Panić; Doris Delač; Marin Roje; Ivana Radojčić Redovniković; Marina Cvjetko Bubalo
      Abstract: Objective Chiral building blocks [(S)-1-(3-methylphenyl)ethanol, (S)-1-(3,4-dimethylphenyl)ethanol and (S)-1-(2,4,6-trimethylphenyl)ethanol] for drug synthesis were prepared using two green approaches: (1) the yeast Saccharomyces cerevisiae as the biocatalyst and (2) the natural deep eutectic solvents (NADES) as the alternative solvents. Three different NADES with different water contents were prepared and screened for the highest conversion and enantiomeric excess of reduction of 1-(3-methylphenyl)ethanone, 1-(3,4-dimethylphenyl)ethanone (DMPA) and 1-(2,4,6-trimethyphenyl)ethanone by S. cerevisiae. The results were used in the development of eco-friendly procedures on a preparative scale. Results The highest enantioselectivity of baker´s yeast was for the bioconversion of DMPA in choline chloride:glycerol with 30% (v/v) of water (ChGly30). This reaction was used for further studies. Parameters such as pre-treatment of biocatalysts and recyclation of solvent were tested for a possible scale-up of this reaction system. Conversion was improved with the ultrasound pre-treatment of the biocatalysts in ChGly30. Moreover, the biocatalytic asymmetric reduction of DMPA in ChGly30 was successfully performed on a preparative scale with the efficient recyclation of NADES in two cycles, in which the reduction of DMPA was also successfully performed. Conclusion Three enantioselective reductions in NADES with baker’s yeast were successfully conducted. According to the highest enantioselectivity of the biocatalyst, the asymmetric reduction of 1-(3,4-dimethylphenyl)ethanone in ChGly30 was also performed on a preparative scale with efficient recyclation and reuse of NADES as a first step towards the implementation of this method on the industrial scale.
      PubDate: 2018-12-03
      DOI: 10.1007/s10529-018-2631-3
       
  • Biogas from microalgae: an overview emphasizing pretreatment methods and
           their energy return on investment (EROI)
    • Authors: Aline de Luna Marques; Ofélia de Queiroz Fernandes Araújo; Magali Christe Cammarota
      Abstract: Studies have reported enhancements in methane yield from pretreatment methods that benefit the anaerobic digestion (AD) of microalgae. However, energy return on investment (EROI), i.e., methane production enhancement achieved over energy input, may be unfavorable. Aiming to quantify EROI of AD microalgae pretreatment, about 180 experiments applied to 30 microalgae biomasses were compiled through an extensive literature survey, classified into 4 pretreatments (physical, enzymatic, chemical, and hybrid), and analyzed. Most of these pretreatments enhanced methane yield, especially the enzymatic alternative. EROI was evaluated for the most efficient pretreatments. Only in one thermal pretreatment the energy resulting from the increase in methane production exceeded the energy demanded by the biomass pretreatment (EROI 6.8) and other two thermal pretreatments presented EROI 1. The other pretreatments presented EROI < 1, concluding that none of the evaluated methods was energy-efficient. Feasibility of pretreatment requires advancements in low energy-demanding strategies and outstanding biomass densification.
      PubDate: 2018-12-01
      DOI: 10.1007/s10529-018-2629-x
       
  • BABY BOOM ( BBM ): a candidate transcription factor gene in plant
           biotechnology
    • Authors: Priyanka Jha; Vijay Kumar
      Abstract: Plants have evolved a number of transcription factors, many of which are implicated in signaling pathways as well as regulating diverse cellular functions. BABY BOOM (BBM), transcription factors of the AP2/ERF family are key regulators of plant cell totipotency. Ectopic expression of the BBM gene, originally identified in Brassica napus, has diverse functions in plant cell proliferation, growth and development without exogenous growth regulators. The BBM gene has been implicated to play an important role as a gene marker in multiple signaling developmental pathways in plant development. This review focuses on recent advances in our understanding of a member of the AP2 family of transcription factor BBM in plant biotechnology including plant embryogenesis, cell proliferation, regeneration, plant transformation and apogamy. Recent discoveries about the BBM gene will inevitably help to unlock the long-standing mysteries of different biological mechanisms of plant cells.
      PubDate: 2018-10-08
      DOI: 10.1007/s10529-018-2613-5
       
  • Anti-CD37 targeted immunotherapy of B-Cell malignancies
    • Authors: Zahra Payandeh; Effat Noori; Bahman Khalesi; Maysam Mard-Soltani; Jalal Abdolalizadeh; Saeed Khalili
      Abstract: CD37 is a member of tetra-spanning superfamily (characterized by their four transmembrane domains). It is one of the specific proteins for normal and malignant mature B cells. Anti CD37 monoclonal antibodies are reported to improve the overall survival in CLL. These therapeutics will increase the efficacy and reduce the toxicity in patients with both newly diagnosed and relapsed and refractory disease. Recent clinical trials have shown promising outcomes for these agents, administered both as monotherapy and in combination with standard chemotherapeutics. Long-term follow-up of combination regimens has even raised the question of whether the patients with CLL could be treated with intensive chemo-immunotherapy. In the present study, CD37 is introduced as an appealing target to treat B cell malignancies. The anti-CD37 antibodies as one of the most successful therapeutics against CD37 are introduced and the clinical outcomes of their exploitation are explained.
      PubDate: 2018-10-06
      DOI: 10.1007/s10529-018-2612-6
       
 
 
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