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  Subjects -> BIOLOGY (Total: 3149 journals)
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BIOTECHNOLOGY (237 journals)                  1 2 | Last

Showing 1 - 200 of 237 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
Advanced Biomedical Research     Open Access  
Advances in Bioscience and Biotechnology     Open Access   (Followers: 14)
Advances in Genetic Engineering & Biotechnology     Hybrid Journal   (Followers: 8)
African Journal of Biotechnology     Open Access   (Followers: 6)
Algal Research     Partially Free   (Followers: 10)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 64)
American Journal of Bioinformatics Research     Open Access   (Followers: 7)
American Journal of Polymer Science     Open Access   (Followers: 31)
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 Bioenergy     Open Access  
Applied Biosafety     Hybrid Journal  
Applied Food Biotechnology     Open Access   (Followers: 3)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 63)
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: 8)
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)
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  
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)
Biosimilars     Open Access   (Followers: 1)
Biosurface and Biotribology     Open Access  
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
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: 5)
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: 155)
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: 39)
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  
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)
Contributions to Tobacco Research     Open Access   (Followers: 2)
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)
Industrial Biotechnology     Hybrid Journal   (Followers: 18)
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)
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: 68)
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  
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: 24)
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: 16)
Journal of Integrative Bioinformatics     Open Access  
Journal of International Biotechnology Law     Hybrid Journal   (Followers: 3)
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: 11)
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)
Messenger     Full-text available via subscription  
Metabolic Engineering Communications     Open Access   (Followers: 4)
Metalloproteinases In Medicine     Open Access  
Microalgae Biotechnology     Open Access   (Followers: 2)
Microbial Biotechnology     Open Access   (Followers: 9)
MicroMedicine     Open Access   (Followers: 3)
Molecular and Cellular Biomedical Sciences     Open Access  
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  
Nanomaterials and Tissue Regeneration     Open Access  
Nanomedicine and Nanobiology     Full-text available via subscription  
Nanomedicine Research Journal     Open Access  
Nanotechnology Reviews     Hybrid Journal   (Followers: 5)
Nature Biotechnology     Full-text available via subscription   (Followers: 535)

        1 2 | Last

Journal Cover
Iranian Journal of Biotechnology
Journal Prestige (SJR): 0.162
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2322-2921 - ISSN (Online) 1728-3043
Published by Kowsar Publishing Co Homepage  [19 journals]
  • Factors Influencing in vitro Organogenesis of Chrysanthemum morifolium cv.
           ‘Resomee Splendid’

    • Abstract: Background: Chrysanthemum; also commonly known as mums or chrysanths, is one of the most important ornamental crops worldwide. Introducing desirable traits into this valuable plant by the conventional breeding has so far been faced with some restrictions due to the limited gene pool and cross-incompatibility. Therefore, breeders have decided to exploit Agrobacterium-mediated transformation methods in order to satisfy the growing market demands. However, the more efficient in vitro regeneration protocols are required for this approach.Objectives: The objective of this research was to develop an effi cient protocol for an in vitro plant regeneration by the examining the eff ects of various combinations and concentrations of the plant growth regulators (PGRs) and different explants types.Materials and Methods: The leaf and petiole explants of the Chrysanthemum morifolium cv. ‘Resomee Splendid’ were collected from the in vitro grown plantlets. Murashige and Skooge (MS) medium was supplemented with different concentrations and combinations of benzylaminopurine (BAP), 1-naphthaleneacetic acid (NAA) and thidiazuron (TDZ). Thereafter, the eff ects of these hormonal treatments were investigated on shoot initiation percentage, the average number of shoots per explants, callogenesis, and the type of organogenesis in regard to both types of the explants.Results: Shoots were directly formed from leaf explants on the media that only contained BAP without callus formation. Amongst the other hormonal treatments, a combination of 4.5 mg.L-1 BAP plus 1 mg.L-1 NAA resulted in the direct organogenesis from the leaf explants, which was superior to the other combinations and concentrations. In regard to the petiole explants, direct shoot formation occurred in all the media except for the ones which were fortifi ed with TDZ. In this case, considering the shoot initiation percentage and the mean shoot number per explants, the best results were achieved in the medium supplemented with 1.5 mg.L-1 BAP and 1 mg.L-1 NAA. Results showed that interaction of either BAP or TDZ with NAA was necessary for the callus induction.Conclusions: Signifi cant diff erences in shoot initiation percentage and the average number of shoots per explants were observed both in leaves and petioles grown on diff erent media. Moreover, the callogenesis rates, as well as organogenesis types, showed some diff erences among the studied explants when compared on the same media.
      PubDate: Sat, 10 Mar 2018 20:30:00 +010
       
  • Transient Expression of Biologically Active Anti-rabies Virus Monoclonal
           Antibody in Tobacco Leaves

    • Abstract: Background: Rabies virus is a neurotropic virus that causes fatal, but, a preventable disease in mammals. Administration of rabies immunoglobulin (RIG) is essential for the post-exposure of the prophylaxis to prevent the disease. However, replacement of polyclonal RIGs with alternative monoclonal antibodies (MAbs) that are capable of neutralizing rabies virus has been recommended.Objectives: Here, we have investigated the transient expression of the full-size human MAb against rabies virus glycoprotein; the MAb SO57 in the tobacco plants using vacuum agro-infi ltration. Previously, stably transformed plants expressing the MAb have been reported.Materials and Methods: In this study three vectors carrying the codon-optimized genes for the heavy or light chain and p19 silencing-suppressor were constructed. These vectors were co-infi ltrated into Nicotiana tabacum leaves and the transgenes were expressed.Results: Dot blot, Western blotting, ELISA, and in vitro neutralization assays of the plant extracts showed that the human MAb could assemble in tobacco leaves and was able to neutralize rabies virus.Conclusions: This study is the fi rst report of transient expression of human MAb SO57 gene in tobacco plant within a few days after vacuum agro-infiltration.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • The Desirability Optimization Methodology; a Tool to Predict Two
           Antagonist Responses in ...

    • Abstract: Background: The use of the desirability function approach combined with the response surface methodology (RSM), also called Desirability Optimization Methodology (DOM), has been successfully applied to solve medical, chemical, and technological questions. It is particularly effi cient for the determination of the optimal conditions in natural or industrial processes involving diff erent factors leading to the antagonist responses.Objectives: Surprisingly, DOM has never been applied to the research programs devoted to the study of plant responses to the complex environmental changes, and thus to biotechnological questions.Materials and Methods: In this article, DOM is used to study the response of Datura stramonium hairy roots (HRs), obtained by genetic transformation with Agrobacterium rhizogenes A4 strain, subjected to the jasmonate treatments.Results: Antagonist eff ects on the growth and tropane alkaloid biosynthesis are confi rmed. With a limited number of experimental conditions, it is shown that 0.06 mM jasmonic acid (JA) applied for 24 h leads to an optimal compromise. Hyoscyamine levels increase by up to 290% after 24 h and this treatment does not significantly inhibit biomass growth.Conclusions: It is thus demonstrated that the use of DOM can effi ciently - with a minimized number of replicates - leads to the optimization of the biotechnological processes.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • The Effect of Oxalic Acid, the Pathogenicity Factor of Sclerotinia
           sclerotiorum on the Two ...

    • Abstract: Background: One of the main sunfl ower diseases is the white mold Sclerotinia sclerotiorum. The oxalic acid (OA), which is one of the main pathogenicity factors of this fungus, beside the direct toxicity on the host, has other functions such as the disruption of the cell wall and chelating out the calcium ions.Objectives: Regarding the importance of this disease, it is important to study the reactions of the plant against OA which is a nonspecifi c toxin of many other necrotrophic fungi.Materials and Methods: In this study, two susceptible and moderately resistant sunfl ower lines were inoculated with OA and samples at the fi rst leaf stage were collected within the intervals of 2, 6, 12 and 24 hours post inoculation. The expression of five genes related to tricarboxylic acid cycle, including citrate synthase, fumarase, iso-citrate lyase, malate synthase and malate dehydrogenase was studied under OA treatment.Results: Two hours after the inoculation, no signifi cant change was observed in the expression of the fi ve studied genes in the moderately resistant line. The iso-citrate lyase gene, which is related to glyoxylate cycle (a variation of the tricarboxylic acid cycle), showed no change in the moderately resistant line; however, it showed an increase in the susceptible line. The increase in fumarase gene expression in moderately resistant line was higher than the susceptible line. The result showed the activation of glyoxylate cycle and destruction of fatty acids in the susceptible line.Conclusions: Activation of glyoxylate cycle indicated induction of senescent symptoms by OA in susceptible line. Increasing in H2O2 leads to oxidative burst and cell death. Cell death has an apparent benefi t for development and growth of necrotrophic pathogens in the plant cells. The study of resistance mechanisms in response to the pathogen can be useful for breeding programs to provide lines with higher resistance to this pathogen.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Functional Assessment of an Overexpressed Arabidopsis Purple Acid
           Phosphatase Gene (Atpap26) in ...

    • Abstract: Background: Overexpression of known genes encoding key phosphate (Pi)-metabolizing enzymes, such as acid phosphatases (APases), is presumed to help plants with Pi availability and absorption as they are mostly exposed to suboptimal environmental conditions for this vital element.Objectives: In this study, the overexpression eff ect of AtPAP26, one of the main contributors in retrieving Pi from intracellular and extracellular compounds was evaluated from various angles in tobacco plants.Materials and Methods: As a heterologous expression system, the encoding cDNA sequence of AtPAP26 was transferred into tobacco plants.Results: A high growth rate of the transgenic lines was observed which could be due to an increased APase activity, leading to the high total phosphorus as well as the free Pi content of the transgenic plants. Interestingly, a significant increased activity of the other APases was also noticed, indicating a networking among them. These were accompanied by less branched and short primary roots and a decreased lateral root numbers grown in Pi-starvation condition compared to the wild type seedlings. Besides, a delayed germination and dwarf phenotype indicates the possible reduction in gibberellic acid biosynthesis in the transgenic lines.Conclusions: Such transgenic plants are of interest not only for increased yield but also for the reduced need for chemical fertilizers and removal of excessive Pi accumulation in soils as a consequence of fertilizer over-usage or poultry wastes.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Development of A Novel Gene Expression System for Secretory Production of
           Heterologous Proteins ...

    • Abstract: Background: Corynebacterium glutamicum (C. glutamicum) is a potential host for the secretory production of the heterologous proteins. However, to this date few secretion-type gene expression systems in C. glutamicum have been developed, which limit applications of C. glutamicum in a secretory production of the heterologous proteins.Objectives: In this study, a novel and effi cient general secretory (Sec) pathway-dependent type gene expression system for the production of heterologous proteins was developed in C. glutamicum.Materials and Methods: The synthesized cloning/expression cassette C was assembled into the basic E. coli-C. glutamicum shuttle vector pAU2, generating the Sec-dependent type gene expression vector pAU5. Subsequently, the applicability of the C. glutamicum/pAU5 system was tested using the α-amylase AmyE from Bacillus subtilis as a reporter protein.Results: The vector pAU5 was successfully constructed. The SDS-PAGE experiment showed the AmyE protein band could be observed in the original culture supernatant of the 14067/pAU5-amyE. The Western blotting experiment showed that the AmyE polypeptide could be detected in the culture supernatant of the 14067/pAU5-amyE, not in the cell lysate of 14067/pAU5-amyE. The α-amylase specifi c activity of the culture supernatant of 14067/pAU5-amyE was 103.24±7.14 U.mg-1 protein, while no α-amylase activity was detected in the cell homogenate supernatant of 14067/pAU5-amyE. These results demonstrate that the recombinant AmyE was effi ciently expressed and completely secreted into the extracellular environmentin an active form in C. glutamicum/pAU5 system.Conclusions: A novel effi cient Sec-dependent type gene expression vector pAU5 was constructed in the C. glutamicum. The vector pAU5 employs the strong promoter tac-M for controlling a constitutive transcription of the target gene, the consensus ribosome binding site (RBS) sequence of C. glutamicum to ensure protein translation, and the effi cient Sectype cgR_2070 signal sequence to mediate protein secretion in the C. glutamicum. The C. glutamicum/pAU5 system is an efficient expression system for the secretory production of the heterologous proteins.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Optimization of EnBase Fed-Batch Cultivation to Improve Soluble Fraction
           Ratio of α-Luffin ...

    • Abstract: Background: The increase of the protein expression via ribosomal manipulation is one of the suggested cellular mechanisms involved in EnBase fed-batch mode of cultivation. However, this system has not been implemented for cytotoxic proteins.Objectives: Here, the expression pattern of α-Luffi n, a ribosome inactivation protein (RIP) with an innate toxicity, was investigated in EnBase system and the eff ect of low temperature cultivation on the increase of α-Luffi n solubility was determined.Materials and Methods: The encoding cDNA for mature α-Luffi n was synthesized and subcloned into pET28a plasmid under the control of T7 promoter. The E. coli expression yield in EnBase® Flo fed-batch system was compared with traditional batch mode at two temperatures: 25 °C and 30 °C. Sampling was performed at several time intervals and solubility of recombinant-protein was checked on SDS-PAGE in pellet and supernatant samples. The purifi cation of recombinant protein was performed by Ni-NTA column.Results: In fed-batch cultivation mode, the early incubation time was desirable at 30 °C whereas the maximum amount of soluble α-Luffi n was achieved from the extended protein synthesis period (12 and 24h post induction) at 25 °C.Conclusions: Our founding showed that EnBase had a greater effi cacy in producing higher soluble protein ratios compared to batch cultivation growth rate, however for cytotoxic proteins, incubation temperature and time need to be optimized. Owing to the advantages of natural toxins from RIP family for producing anticancer immune-conjugates, well optimization of this protein expression is of importance regarding industrial aspects. The optimized condition proposed here is promising in terms of large scale soluble production of α-Luffi n without the need for refolding.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Effects of Nonionic Surfactants on Xanthan Gum Production: a Survey on
           Cellular Interactions

    • Abstract: Background: Xanthomonas campestris is a biopolymer producing gram negative bacterium. Production of xanthan biopolymer can be aff ected by diff erent extrinsic factors as well as surfactants. Hitherto, eff ects of nonionic surfactants on xanthan production have been studied in a limited number of articles.Objective: In the present study, nonionic surfactants were used to pursue their eff ects on improvement of xanthan production. Moreover, a number of cellular consequences upon the treatment were investigated with impacts on gum production.Materials and Methods: Eff ects of diff erent nonionic surfactants (Tween 20, Tween 80 and Triton X100) on xanthan production and Xanthomonas campestris cells were assessed by ultramicroscopy (SEM), changes in culture turbidity, leakage of sugars and ATP, and quality of xanthan (i.e. pyruvate content and determination of polymer molecular weight).Results: The nonionic surfactant Tween 20 increased ATP (3.2 folds) and sugar leakage (3.1 folds). Furthermore, they caused cell shape alteration. Tween 80 improved both xanthan production (11 g.L-1) and viscosity of the product (1368 cP), while the total biomass remained unchanged (2.2 g.L-1). Molecular weight of xanthan was enhanced (from 23 to 59 million Da). Toxic eff ect of 5% (v/v) Triton X 100 decreased the turbidity of culture to 120 NTU and total biomass was diminishedto 1 g.L-1. Tween 20 caused the loss of ATP and sugar leakage and led to lower xanthan production. Thus, it had no effect on biomass content.Conclusions: In general, amounts of surfactants that bacterial cells can tolerate seem to be helpful in substrate and metabolite transportation, and enzyme activities involved in xanthan biosynthesis and release. Surfactants induce harsh damages to cell barriers, preventing the growth and adversely aff ecting quantity and quality of xanthan gum.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Addition of Fillers to Sodium Alginate Solution Improves Stability and
           Immobilization Capacity ...

    • Abstract: Background: Although advantages of immobilization of cells through entrapment in calcium alginate gel beads have already been demonstrated, nevertheless, instability of the beads and the mass transfer limitations remain as the major challenges.Objective: The objective of the present study was to increase the stability, porosity (reduce mass transfer limitation), and cell immobilization capacity of calcium alginate gel beads.Materials and Methods: Sodium alginate was mixed with various concentrations of the starch or sugar and gelled in 2% calcium chloride solution. During the gelling and curing, the starch or sugar leached out of the beads and created micropores.Results: Micro-porous beads prepared with starch were more stable and had higher immobilization capacity than those prepared with sugar. After 24 hours of incubation (curing) of the micro-porous beads prepared with starch in calcium alginate, the solubilization time in citrate buff er was 93 minutes compared to 41 minutes for the control beads (without starch). The compressive strength of the micro-porous beads was also higher (5.62 Mpa) than that of the control beads (5.54 Mpa). The optimal starch concentration for cell immobilization was 0.4%. With this starch concentration, the immobilized Bacillus subtilis and Saccharomyces cerevisiae cell density were 5.6 × 109 and 1.2 × 108 cells/beads, respectively. These values were 36.5% and 74% higher than the value obtained for the control beads. This method of immobilization resulted in more uniform cell distribution.Conclusion: Addition of starch to the sodium alginate solution before gelation in calcium chloride solution increased the stability of the beads, increased the immobilized cell density, and resulted in a more uniform cell distribution in the beads.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Functional and Molecular Characterization of C91S Mutation in the Second
           Epidermal Growth ...

    • Abstract: Background: Coagulation Factor VII is a vitamin K-dependent serine protease which has a pivotal role in the initiation of the coagulation cascade. The congenital Factor VII defi ciency is a recessive hemorrhagic disorder that occurs due to mutations of F7 gene. In the present study C91S (p.C91S) substitution was detected in a patient with FVII defi ciency. This mutation has not been characterized by a functional study.Objectives: In this study, we aimed to evaluate the impact of C91S substitution on factor VII expression and function.Materials and Methods: The F7 complete cDNA was isolated from HepG2 cell line and inserted into the pcDNA3.1 mammalian expression vector. The desired mutation was generated by the site-directed mutagenesis and the wild-type and mutated constructs were transfected into CHO-K1 cells. The protein activity and antigen level (antigen concentration) were validated in the culture medium and cell lysate of the transiently transformed cells. An immunocytochemistry procedure was also performed to evaluate the intracellular localization of the mutated and the wild-type FVII, as well.Results: The present in vitro study has demonstrated that C91S antigen expression was increased in the transfected CHO-K1 cells compared to the wild-type (WT) protein. Despite an increased protein secretion, the factor VII coagulant activity was diminished following C91S substitution when it was assessed by a standard one-stage analysis. In addition, the immunocytochemistry procedure revealed that there was no diff erence in the intracellular localization of the C91S mutated FVII compared to the WT protein.Conclusions: Our results present that C91S mutation has an eff ect on the coagulation activity, secretion, biosynthesis, and probably folding of the FVII leading to the FVII defi ciency.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Sequence Characterization in 3′-Flanking Region of Bovine TNF-α:
           Association with Milk ...

    • Abstract: Background: Tumor necrosis factor-  (TNF-α) is a cytokine that was identifi ed as a factor with a wide range of proinflammatory activities. The expression of bovine TNF-α in mammary tissue during pregnancy seems to have a role in development of the corresponding glands.Objective: Single nucleotide polymorphisms (SNPs) were defi ned in 3′-fl anking region of bovine TNF-α incattle. Moreover, its association with performance traits in Holstein dairy cattle was evaluated.Materials and Methods: The 3′-fl anking region of TNF-α was screened by single strand conformationpolymorphism (SSCP) and DNA sequencing in Holstein cattle breeds. SAS statistical software was used toanalyze the relationship between diff erent genotypes of amplifi ed fragment with milk production traits (dailymilk yield, fat and protein percentage) and somatic cell score (SCS).Results: A total of 6 distinct SSCP patterns were observed. It was further revealed to be 3 novel SNPs. Statistical analysis revealed that diff erent haplotypes of amplifi ed fragment in the TNF-α 3′-region had a signifi cant effect on average daily milk production (p < 0.05), but no such correlation was established with fat percentage, protein percentage and SCS.Conclusion: The association identifi ed in the 3′-fl anking region of TNF-α may have potential to serve as candidate genetic marker for genomic selection in dairy cattle.
      PubDate: Wed, 28 Feb 2018 20:30:00 +010
       
  • Bone Marrow Stromal Cells Associated with Poly L-Lactic-Co-Glycolic Acid
           (PLGA) Nanofiber ...

    • Abstract: Background: Although peripheral nerves show capacity for regeneration after injury to a certain extent, but, the extent of regeneration is not remarkable. Previous studies have suggested that through the production of growth factors or extracellular matrix components, mesenchymal stem cells may enhance nerve regeneration.Objectives: In the present study, the therapeutic potency of the Bone Marrow Stromal Cells (BMSCs) associated with Poly L-lactic-co-glycolic acid (PLGA) nanofiber Scaffoldson rat sciatic nerve repair was evaluated.Material and Methods: Thirtyadult male Wistar rats (220-250 g) were divided randomly into six groups, including Control 1 (transected sciatic nerve), Control 2 (transected sciatic nerve and stitched), Sham, PLGA, BMSCs, and PLGA+BMSCs. Functional recovery was evaluated at the end of 2nd, 4th, 6th, and 8th weeks after surgery using sciatic functional index (SFI) and hot water test. After killing all rats at the end of 8th week, their sciatic nerves were removed, fixed, and processed for the histological  examination and analysis by the Motic software.Results: A significant recovery of the sciatic nerve function was observed in the PLGA+BMSCs transplanted group at the  8th week after surgery as demonstrated by SFI and hot water findings. Histological examinations also showed a significant improvement in the PLGA+BMSCs group compared to the Control 1, 2, Sham, PLGA and BMSCs groups.Conclusion: BMSCs associated with PLGA nanofiber scaffold might be useful for improving the functional peripheral nerve repair having some clinical outcome.
      PubDate: Mon, 19 Jun 2017 19:30:00 +010
       
 
 
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