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Showing 1 - 200 of 2351 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 19, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 22, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 7, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 23, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 16, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 7)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 20, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 10, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
Activitas Nervosa Superior     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 23, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 15, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 35, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 18, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 54, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 25, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 43, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 2, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 16, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 2, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 4)
Agriculture and Human Values     Hybrid Journal   (Followers: 14, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 19, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 11, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 6, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 4, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 8, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 26, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 8, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 15, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 3, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 31, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 17, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 14, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 6, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 16, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.186, h-index: 78)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 14, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 8, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 42, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 16, SJR: 0.267, h-index: 26)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 3, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 4, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 11, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 62, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 8, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 24, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 18, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 32, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 23, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 56, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.865, h-index: 40)
Archives and Museum Informatics     Hybrid Journal   (Followers: 142)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 13, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 14, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 8, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 8)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover Applied Biochemistry and Microbiology
  [SJR: 0.267]   [H-I: 26]   [16 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3024 - ISSN (Online) 0003-6838
   Published by Springer-Verlag Homepage  [2351 journals]
  • Regulation of Escherichia coli Biofilm Formation (Review)
    • Authors: J. A. Markova; E. V. Anganova; A. L. Turskaya; V. A. Bybin; E. D. Savilov
      Pages: 1 - 11
      Abstract: The review considers the regulatory mechanisms controlling the formation of biofilms by bacteria Escherichia coli. Under harsh conditions, microbial populations transfer to the structured mode of existence by building biofilms. The regulation of biofilm formation is a complex multistage process. Environmental signals are perceived by two-component signaling systems, which fulfill their transduction to the genome. This switches microbial cells from the planktonic motile lifestyle to the sessile.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010040
      Issue No: Vol. 54, No. 1 (2018)
  • Study of Structural-Functional Organization of Nucleoside Phosphorylases
           of Gammaproteobacteria. Special Aspects of Functioning of Uridine
           Phosphorylase Phosphate-Binding Site
    • Authors: N. N. Mordkovich; T. N. Safonova; A. N. Antipov; V. A. Manuvera; K. M. Polyakov; N. A. Okorokova; V. P. Veiko
      Pages: 12 - 20
      Abstract: Series of mutant genes of prokaryotic uridine phosphorylases (Shewanella oneidensis MR-1, Escherichia coli) were constructed, and the resulting strains-producers of the corresponding proteins were obtained. Proteins were purified, and their physicochemical and fermentative properties were studied. On the basis of the obtained data, the role of individual amino acid residues of the polypeptide chain of uridine phosphorylases in the formation and functioning of the phosphate-binding site in these proteins was shown. The assumption of independent binding of two substrates, ion of inorganic phosphate (Pi) and uridine (Urd), by nucleoside phosphorylases, was made.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010064
      Issue No: Vol. 54, No. 1 (2018)
  • Vanillin Resistance Induced by BssS Overexpression in Escherichia coli
    • Authors: M. V. Ovsienko; E. N. Fedorova; V. G. Doroshenko
      Pages: 21 - 25
      Abstract: Overexpression of the BssS gene, a biofilm formation regulator, in planktonic Escherichia coli cells has been shown to confer the vanillin-resistant phenotype Vanr to the bacteria. The MG1655PL-tac-bssS strain started growing in liquid aerated LB medium with 2 g/L vanillin after a lag phase of 17 ± 2 h, whereas the original MG1655 strain did not grow under these conditions. The role of aldehyde reductase YqhD, a vanillin- degrading enzyme, in Vanr phenotype formation has been assessed. However, the Vanr trait in the MG1655PL-tac-bssS strain primarily depended on autoinducer-2 (AI-2), which formed in E. coli cells with an intact luxS gene. We supposed that BssS acts together with autoinducer-2 (which presumably accumulated during the prolonged lag phase) to induce vanillin resistance determined by changes in the expression of a range of genes.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010088
      Issue No: Vol. 54, No. 1 (2018)
  • Methemoglobin Reductase of Bacteria and Bacteroids Bradyrhizobium lupini :
           Purification and Properties
    • Authors: V. V. Talyzin; N. F. Bashirova; O. V. Kosmachevskaya; N. V. Punina; L. I. Arabova; N. V. Tikhomirova; A. F. Topunov
      Pages: 26 - 33
      Abstract: Reductase capable of reducing hemoglobin-like proteins was isolated from nodule bacteria Bradyrhizobium lupini and bacteroids of lupine root nodules. It is similar in some properties to many known methemoglobin reductases reducing animal and plant hemoglobins. It is a NADH-dependent FAD-containing flavoprotein with molecular weight of 87 kDa without metals. The presence of such enzymes in prokaryotes could be an explanation for the physiological activity of both bacterial and eukaryotic hemoglobins expressed in bacterial cells.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010131
      Issue No: Vol. 54, No. 1 (2018)
  • Isolation and Properties of Succinate Dehydrogenase Isozymes from Maize
           Scutellum ( Zea mays L.)
    • Authors: A. T. Eprintsev; D. N. Fedorin; L. A. Karabutova; O. Florez; M. Puglla
      Pages: 34 - 37
      Abstract: Four electrophoretically homogeneous succinate dehydrogenase isoenzymes with specific activities of 0.041, 0.110, 0.030 and 0.037 U/mg protein were isolated and purified from maize scutellum (Zea mays L.). Their catalytic properties and pH optimums were studied.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010039
      Issue No: Vol. 54, No. 1 (2018)
  • Catalytic Properties of Lipase Entrapped as Lysates of Recombinant
           Strain-Producer r Escherichia coli /lip into Nanocarbon-in-Silica
           Composites in the Bioconversion of Triglycerides and Fatty Acids
    • Authors: L. V. Perminova; G. A. Kovalenko; A. B. Beklemishev; A. L. Mamaev; M. B. Pykhtina; N. A. Rudina
      Pages: 38 - 44
      Abstract: Composite multi-component biocatalysts were prepared by entrapping lysates of a recombinant rE. coli/lip strain producing Thermomyces lanuginosus lipase into composite nanocarbon-containing matrices based on a SiO2 xerogel. The dependence of the lipase activity and operational stability on the type of the carbon component (nanotubes or nanospheres of different diameters) was studied in the bioconversion of triglycerides (hydrolysis and interesterification), as well as in the esterification of saturated fatty acids—namely, butyric (C4:0), capric (C10:0), and stearic (C18:0) acids—with isoamyl alcohol. It was shown that the biocatalytic properties were determined by both the texture parameters of the nanostructured carbon included and the type of enzymatic reaction performed. Biocatalysts without a nanocarbon component had the highest operational stability in the batch process of interesterification of sunflower oil with ethyl acetate; the half-life time was found to be 720 h at 40°C. Biocatalysts containing carbon nanotubes of ~21 nm in diameter were five to six times more active in the batch esterification process than biocatalysts without a nanocarbon component. Biocatalysts containing carbon nanotubes catalyzed the synthesis of esters in a binary organic solvent (hexane and diethyl ether) without a loss of activity for more than 500 h at 40°C.
      PubDate: 2018-01-01
      DOI: 10.1134/s000368381801009x
      Issue No: Vol. 54, No. 1 (2018)
  • Nitrocellulose Degradation by the Fungus Fusarium solani
    • Authors: E. A. Saratovskikh; V. A. Shcherbakova; R. N. Yarullin
      Pages: 45 - 52
      Abstract: The degradation of native and pretreated nitrocellulose (NC) by the microscopic fungus Fusarium solani VKM F-819 and a mixed culture of the fungus with a sulfate-reducing bacterium Desulfovibrio desulfuricans VKM B-1388 has been studied. It has been shown that NC pretreatment with UV radiation and ozone promoted its subsequent biodegradation. The degradation of the thus treated NC by a mixed culture of F. solani and D. desulfuricans was the most effective as compared to all other treatment options. The NC nitrogen content decreased from 13.38 to 10.03%; the number average (Mn) and weight average (Mw) molecular masses decreased by three and two times, respectively. These magnitudes were achieved after 5 days of incubation of the pretreated NC. The obtained data can be used to further develop NC degradation technology.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010106
      Issue No: Vol. 54, No. 1 (2018)
  • The Influence of Chemical Mutagenesis on the Properties of the
           Cyclosporine a High-Producer Strain Tolypocladium inflatum VKM F-3630D
    • Authors: A. G. Domratcheva; A. A. Zhgun; N. V. Novak; V. V. Dzhavakhiya
      Pages: 53 - 57
      Abstract: The effects of treatment with the chemical mutagen N-nitroso-N-methylurea (NMU) on the survival rate, morphological variability, and the level of production of cyclosporine A (CyA) in the Tolypocladium inflatum subsporum blastosporum strain VKM F-3630D were studied. The range of exposure to the dose of the mutagen (incubation time and concentration of HMU) was determined. The lethal and sublethal doses, as well as the conditions under which the highest variability in the levels of CyA production was observed, were determined. It was shown that the most efficient method to further increase CyA production in the studied high-producer T. inflatum strain is mutagenic treatment with 0.1% HMU for 2 h. In this case, we observed a relatively high level of survival of clones (80–85%), a low level of their morphological variability (10–15%), and a wide range in the CyA production level (80–170%) as compared to the original strain. This enabled us to select a number of clones with an increased CyA production level. The yield of the target metabolite was maximal in clone no. 13-27, where the CyA production level increased by 1.6–1.7 times.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010027
      Issue No: Vol. 54, No. 1 (2018)
  • Fermentation of Detoxified Acid-Hydrolyzed Pyrolytic Anhydrosugars into
           Bioethanol with Saccharomyces cerevisiae 2.399
    • Authors: Z. U. Islam; S. P. Klykov; Z. Yu; D. Chang; E. B. Hassan; H. Zhang
      Pages: 58 - 70
      Abstract: Pyrolysate obtained from the pyrolysis of waste cotton is a source of fermentable sugars that could be fermented into bioethanol fuel and other chemicals via microbial fermentation. However, pyrolysate is a complex mixture of fermentable and non-fermentable substrates causing inhibition of the microbial growth. The aim of this study was to detoxify the hydrolysate and then ferment it into bio-ethanol fuel in shake flasks and fermenter applying yeast strain Saccharomyces cerevisiae 2.399. Pyrolysate was hydrolyzed to glucose with 0.2 M sulfuric acid, neutralized with Ba(OH)2 followed by treatment with ethyl acetate and activated carbon to remove fermentation inhibitors. The effect of various fermentation parameters such as inoculum concentration, pH and hydrolysate glucose was evaluated in shake flasks for optimum ethanol fermentation. With respect to inoculum concentration, 20% v/v inoculum i.e. 8.0 × 108–1.2 × 109 cells/mL was the optimum level for producing 8.62 ± 0.33 g/L ethanol at 9 h of fermentation with a maximum yield of 0.46 g ethanol/g glucose. The optimum pH for hydrolysate glucose fermentation was found to be 6.0 that produced 8.57 ± 0.66 g/L ethanol. Maximum ethanol concentration, 14.78 g/L was obtained for 4% hydrolysate glucose concentration after 16 h of fermentation. Scale-up studies in stirred fermenter produced much higher productivity (1.32 g/L/h–1) compared to shake flask fermentation (0.92 g/L/h–1). The yield of ethanol reached a maximum of 91% and 89% of the theoretical yield of ethanol in shake flasks and fermenter, respectively. The complex of integrated models of development was applied, that has been successfully tested previously for the mathematical analysis of the fermentation processes.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010143
      Issue No: Vol. 54, No. 1 (2018)
  • Study of the Protective Activity of Chitosan Hydrolyzate Against Septoria
           Leaf Blotch of Wheat and Brown Spot of Tobacco
    • Authors: B. Ts. Shagdarova; A. V. Ilyina; S. A. Lopatin; M. I. Kartashov; L. R. Arslanova; V. G. Dzhavakhiya; V. P. Varlamov
      Pages: 71 - 75
      Abstract: Chitosan hydrolyzate containing low-molecular-weight chitosan (≤24 kDa) and its oligomers (≤1.2 kDa) has been obtained via chemical depolimerization of high-molecular-weight chitosan by nitric acid. The fractions of the obtained chitosan hydrolyzate have been characterized by high performance gel permeation chromatography and proton magnetic resonance. The test performed on detached leaves of wheat has shown that the hydrolyzate completely inhibits the development of Stagonospora nodorum, a casual agent of the septoria leaf blotch, at a concentration of 200 μg/mL. A similar test with detached tobacco leaves has shown that the hydrolyzate at a concentration of 100 μg/mL also inhibits the development of Alternaria longipes, which causes brown spot of tobacco, by 75%.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010118
      Issue No: Vol. 54, No. 1 (2018)
  • Hydrolysis of Soybean Proteins with Kamchatka Crab Hepatopancreas Enzyme
    • Authors: T. A. Muranova; D. V. Zinchenko; L. A. Melanyina; A. I. Miroshnikov
      Pages: 76 - 82
      Abstract: To perform hydrolysis with the enzyme complex from the hepatopancreas of the Kamchatka crab, a protein mixture was isolated from soybean meal by extraction at alkaline pH values. Extractable low-molecular impurities were removed by ultrafiltration and precipitation of proteins with alcohol. The amino acid composition of the obtained protein extract turned out to be similar to the composition of the fish meal traditionally used in the production of fish feeds. Analysis of the products of fermentolysis by DDS-electrophoresis, HPLC, and mass spectrometry showed a high degree of hydrolysis of soybean proteins. Depending on the time of fermentolysis, the hydrolysates contained up to 60% (18 h of hydrolysis) of free amino acids (the fraction of the weight of the hydrolyzed protein mixture) and short peptides (2–20 amino acid residues).
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010076
      Issue No: Vol. 54, No. 1 (2018)
  • Physicochemical Properties and Biological Activity of the
           Peptide–Protein Complex from Bovine Scleral Tissue
    • Authors: E. V. Sidorskii; A. P. Il’ina; M. S. Krasnova; V. P. Yamskova; A. K. Buryak; I. A. Yamskov
      Pages: 83 - 88
      Abstract: The peptide–protein complex from bovine sclera was studied. It is shown that it contained a protein with a molecular weight of 66387 Da with the partial N-terminal amino acid sequence DTHKSEIAHRFKDLG-, which is homologous to the mature molecule of bovine serum albumin, and polypeptides with molecular weights of 1300–5080 Da. With a model of the organotypic cultivation of posterior eye tissues of the newt Pleurodeles waltl in vitro, it was shown that the effect of this peptide–protein complex in low doses increased the viability of scleral fibroblasts.
      PubDate: 2018-01-01
      DOI: 10.1134/s000368381801012x
      Issue No: Vol. 54, No. 1 (2018)
  • Effect of the Compositions of Sample and Polymer Sorbents on the
           Extraction of Volatile Compounds by Solid-Phase Microextraction
    • Authors: T. A. Misharina; M. B. Terenina; N. I. Krikunova; I. A. Mihailov
      Pages: 89 - 97
      Abstract: A comparative study was performed by solid phase microextraction and capillary gas chromatography to establish the ability of four polymer sorbents of different compositions to extract and concentrate volatile organic compounds from the gas phase above an aqueous solution. All polymer sorbents sorbed nonpolar monoterpene hydrocarbons via a cooperative mechanism with almost equal and high efficiency. Sorbents based on polymethyl disiloxane and its mixture with divinylbenzene were more effective in extracting acetates and sesquiterpenes. As the concentration of these compounds in the gas phase increased, their binding by sorbents decreased. It was found that the determination of polar compounds depended on the presence of a solvent in the system. Compounds that are highly soluble in water (alcohols, ketones, etc.) had low coefficients of distribution between gas and water phases. Consequently, their sorption to any of the polymer sorbents was negligible. In the absence of the solvent, the degree of their extraction from the gas phase above the sample was high. It was shown that the actual composition of compounds in the initial mixture of essential oils could significantly differ from their composition in the gas phase. This method is convenient and informative for the purpose of studying the composition of volatile compounds in the gas phase that determine the flavor of the product.
      PubDate: 2018-01-01
      DOI: 10.1134/s0003683818010052
      Issue No: Vol. 54, No. 1 (2018)
  • Microbial Electrosynthesis
    • Authors: V. G. Debabov
      Pages: 842 - 858
      Abstract: Electrobiosynthesis conducted by microorganisms represents a new technology with great potential. This review considers mechanisms of direct electron transfer from cathode to bacterial cell and a number of anaerobic processes catalyzed with such transport: the biosynthesis of hydrogen, methane, and multicarbon compounds. The possibilities for the use of electrolysis hydrogen to grow hydrogen oxidizing bacteria are also considered, as well as some examples of electricity that influence the reductive and oxidative processes occurring during fermentation. Realization of the electric biosynthesis potential would require deep fundamental research on the mechanisms of extracellular electron transport and the coupling of electric and metabolic processes. Work would be required to reorganize microbial genomes to intensify their metabolism and broaden the repertoire of synthesized metabolites. Progress in these technologies would depend not only on improvements in microorganisms but also on the successful creation of effective biocompatible electrodes and the designing of highly productive reactors.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817090034
      Issue No: Vol. 53, No. 9 (2017)
  • Aspartic Acid Synthesis by Escherichia coli Strains with Deleted Fumarase
           Genes as Biocatalysts
    • Authors: D. D. Derbikov; A. D. Novikov; T. A. Gubanova; M. G. Tarutina; I. T. Gvilava; D. M. Bubnov; A. S. Yanenko
      Pages: 859 - 866
      Abstract: The work reports the construction of Escherichia coli strain MG1655 derivatives with deleted genes that encode fumarases (fumAC, fumB, and fumABC) via the phage lambda-mediated recombination system. It has been demonstrated that the deletion of fumB gene had almost no effect on strain growth under aerobic conditions, while the deletion of the fumA and fumC genes led to a 30% decrease in the growth rate under the same conditions. When the E. coli strains with deleted fumarase genes were used to catalyze L-aspartic acid synthesis from ammonium fumarate (1.5 M solution), it was observed that only the simultaneous loss of both the fumA and fumC genes led to an at least 20% increase in the aspartic acid yields and a concurrent decrease in the content of the byproduct malic acid in the reaction mixture from 40 to 1.5–2 g/L. The results obtained in the work may be used to generate more efficient novel biocatalysts of L-aspartic acid synthesis.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817090046
      Issue No: Vol. 53, No. 9 (2017)
  • Comparative Analysis of Mono- and Bifunctional Chorismate Synthases in
           Escherichia coli Cells Capable and Incapable of Phenylalanine Production
    • Authors: A. E. Slesareva; L. G. Kuhn; V. G. Doroshenko
      Pages: 867 - 873
      Abstract: The activity of chorismate synthase, the terminal enzyme of the common aromatic pathway, is absolutely dependent on reduced flavin mononucleotide. The bifunctional chorismate synthase of Saccharomyces cerevisiae (product of the ARO2 gene) can reduce flavin in a reaction that involves NADPH, in contrast to the monofunctional chorismate synthase of Escherichia coli (product of the aro C gene). The latter enzyme does not have the capacity for flavin reduction, and its activity therefore depends on the flavin reductase function of the cell. Chemical synthesis of the structural part of the ARO2 gene that involved the substitution of rare E. coli codons was performed for an in vivo comparison of the two types of chorismate synthase. ARO2 expression was tested in the T7 system, and isogenic E. coli strains TG1Δ aro CPtac-ARO2 and TG1Δ aro CPtac- aro C were obtained. Comparative analysis of proteins from the cell extracts of these strains and in silico assessment of hybrid RBS efficiency showed that the level of AroC protein synthesis in TG1Δ aro CPtac- aro C was higher than the level of ARO2 synthesis in the TG1Δ aro CPtac-ARO2 cells. The introduction of Ptac-ARO2 and Ptac- aro C modifications led to complete recovery of the growth of the aromatic auxotroph TG1Δ aro C on minimal mineral medium supplemented with glucose and restored phenylalanine production in the E. coli strain DV1017Δ aro C, which lacked chorismate synthase activity. The similar positive effects of Ptac- aro C and Ptac-ARO2 on phenylalanine biosynthesis in the DV1017ΔtyrR strain, in which chorismate synthase played a “bottleneck” role, indicated the absence of a limiting effect of reduced flavin on monofunctional chorismate synthase overexpressed in E. coli cells.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817090071
      Issue No: Vol. 53, No. 9 (2017)
  • Mutations in the fusA Gene Encoding Elongation Factor G in the Coryneform
           Bacterium Lead to Increased Lysine Production
    • Authors: I. P. Tokmakova; L. E. Ryabchenko; T. V. Gerasimova; S. V. Kameneva; A. S. Yanenko
      Pages: 781 - 785
      Abstract: Resistance to fusidic acid in Corynebacterium glutamicum and Brevibacterium flavum is associated with mutations in the fusA gene, which encodes the elongation factor G (EF-G). Two to ten percent of fusidic acid-resistant clones were shown to produce more lysine than parent strains. Sequencing of the fusA gene in clones with a high level of lysine production made it possible to find two mutations in the gene at position 1383—С1383G and С1383А. These mutations cause amino acid replacement at position 461 in the protein EF-G, namely, histidine is substituted by glutamine (H461Q). The mutation С1383G was introduced in the chromosomal copy of the fusA gene in C. glutamicum and B. flavum strains by homologous recombination. All clones containing the mutant variant of the fusA gene produced 10% more lysine than the parent strains.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817080075
      Issue No: Vol. 53, No. 8 (2017)
  • Obtaining and Study of Callus and Suspension Plant Cell Cultures of
           Tribulus terrestris L., a Producer of Steroidal Glycosides
    • Authors: M. T. Khandy; D. V. Kochkin; S. V. Tomilova; B. A. Galishev; E. S. Sukhanova; A. G. Klyushin; I. M. Ivanov; A. M. Nosov
      Pages: 800 - 806
      Abstract: Callus and suspension plant cell cultures of Tribulus terrestris L., a valuable medicinal plant producing steroidal glycosides, were obtained. The seeds from an American population of T. terrestris were used as explants. Regulation of the production and growth of cell cultures, as well as the biosynthetic characteristics of the cell lines, were studied. The combination of phytohormones of 2,4-D (2.0 mg/L) and BAP (1.0 mg/L) was found to be optimal for callus induction and cultivation. Suspension cell culture obtained in liquid medium of the same composition showed such high growth characteristics during prolonged cultivation (more than 2 years) as a maximum accumulation of dry biomass of 13 g/L, specific growth rate at exponential phase of 0.24 day–1, and economical coefficient of 0.39. A semicontinuous mode of cultivation was used to grow the plant cell suspension in a lab-scale bioreactor. Screening of the steroidal glycosides in the obtained cell cultures was carried out. Steroidal glycosides were not found in the callus cultures. However, as was demonstrated by TLC and UPLC ESI MS methods, the suspension culture contained furostanol glycosides, and their amount increased during the cultivation process. These results support the hypothesis of the autoselection of cultivated cells containing compounds promoting their proliferation in vitro.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817080038
      Issue No: Vol. 53, No. 8 (2017)
  • Preparation and Properties of Nanocolloidal Rhenium Sulfide Solution for
           Lymphoscintigraphic Methods of Micrometastase Examination
    • Authors: B. M. Manuilov; A. V. Ermakov
      Pages: 823 - 826
      Abstract: A method for the preparation of a nanocolloidal solution of rhenium sulfide is proposed. It includes the following stages: interaction of ammonium perrhenate and sodium thiosulfate in an aqueous solution of gelatin in an acidic medium with heating to 70–80°C; neutralization to pH 7.0; dialysis against saline; desalination and concentrating by ultrafiltration. The resulting colloidal solution contains 85% of particles with an optimal size of 80–100 nm and can be used as a diagnostic tool for lymphoscintigraphy of sentinel lymph nodes in patients with cancer and other diseases.
      PubDate: 2017-12-01
      DOI: 10.1134/s000368381708004x
      Issue No: Vol. 53, No. 8 (2017)
  • Design and Study of Properties of Avirulent Genetically Modified Vibrio
           cholerae Biovar El Tor Strain with Inactivated Genes of Thermolabile
    • Authors: N. I. Smirnova; E. Yu. Shchelkanova; E. Yu. Baranikhina; D. A. Agafonov; I. V. Tuchkov; Ya. M. Krasnov; V. V. Kutyrev
      Pages: 761 - 769
      Abstract: The results of the construction of an avirulent strain of V. cholerae genovariant of the O1 serogroup of the El Tor biovar with efficient production of the cholera toxin (CT) B-subunit, which causes the formation of antitoxic immunity during cholera infection, are presented. In the beginning of the study, a modified P18899ΔCTXφchr:TnphoA (KmRHly–) strain was obtained via nondirectional transposon mutagenesis on the basis of a nontoxigenic strain of a P18899ΔCTXφHly+ genovariant. It lost the ability to produce thermolabile hemolysin, which is an additional toxin. The ctxB gene, which encodes biosynthesis of the CT B-subunit, was further introduced into cells of this strain. To accomplish this, the cointegrative recombinant plasmid pIEM3 was used. It was generated in the process of the fusion of a conjugative plasmid pIEM1 and a nonconjugative one, pCTΔ27, which is a derivative of pBR322 (which carries the cloned gene ctxB). Via restriction analysis, it was established that disjunction of a cointegrate occurred in vibrio cholera cells, followed by the preservation of a multicopy plasmid (pCTΔ27) only. As a result, avirulent clones of KmRTcR with a high production level (5–6 μg/mL) of secreted CT B-subunit were obtained, one of which (E99) was selected for further studies. Via real-time PCR, it was discovered that the expression of the ctxB plasmid gene in the cells of a designed strain of V. cholerae, E99, doesn’t depend on the activity of the key regulatory gene toxT, which located on the chromosome. Efficient expression of the ctxB gene in E99 cells allows their use to obtain CT B-subunit in order to produce cholera immunobiological drugs.
      PubDate: 2017-12-01
      DOI: 10.1134/s0003683817070067
      Issue No: Vol. 53, No. 7 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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