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  Subjects -> CHEMISTRY (Total: 889 journals)
    - ANALYTICAL CHEMISTRY (55 journals)
    - CHEMISTRY (623 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (43 journals)
    - ORGANIC CHEMISTRY (48 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (623 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 14)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 27)
ACS Catalysis     Hybrid Journal   (Followers: 44)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 22)
ACS Combinatorial Science     Hybrid Journal   (Followers: 23)
ACS Macro Letters     Hybrid Journal   (Followers: 26)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 42)
ACS Nano     Hybrid Journal   (Followers: 301)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription  
ACS Synthetic Biology     Hybrid Journal   (Followers: 24)
Acta Chemica Iasi     Open Access   (Followers: 5)
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Adsorption Science & Technology     Open Access   (Followers: 6)
Advanced Functional Materials     Hybrid Journal   (Followers: 60)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 73)
Advances in Chemical Science     Open Access   (Followers: 18)
Advances in Chemistry     Open Access   (Followers: 23)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 24)
Advances in Environmental Chemistry     Open Access   (Followers: 7)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 12)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 26)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 8)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 3)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 69)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 22)
American Journal of Chemistry     Open Access   (Followers: 32)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 16)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 171)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 254)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Surface Science     Hybrid Journal   (Followers: 32)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 3)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 371)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 22)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 135)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 87)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 70)
Catalysis for Sustainable Energy     Open Access   (Followers: 8)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 11)
Cellulose     Hybrid Journal   (Followers: 9)
Cereal Chemistry     Full-text available via subscription   (Followers: 5)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 75)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 203)
Chemical Science     Open Access   (Followers: 27)
Chemical Technology     Open Access   (Followers: 32)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 33)
Chemistry & Industry     Hybrid Journal   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 162)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 21)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 4)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Hybrid Journal   (Followers: 264)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 11)
Chromatographia     Hybrid Journal   (Followers: 23)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Cogent Chemistry     Open Access   (Followers: 2)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Communications Chemistry     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 4)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 7)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 8)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal   (Followers: 1)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 9)
Current Science     Open Access   (Followers: 73)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 4)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)

        1 2 3 4 | Last

Journal Cover
BioNanoScience
Journal Prestige (SJR): 0.308
Citation Impact (citeScore): 1
Number of Followers: 5  
 
  Partially Free Journal Partially Free Journal
ISSN (Print) 2191-1630 - ISSN (Online) 2191-1649
Published by Springer-Verlag Homepage  [2351 journals]
  • Oligodynamic Effect of Silver Nanoparticles: a Review
    • Authors: Parteek Prasher; Manjeet Singh; Harish Mudila
      Pages: 951 - 962
      Abstract: The advent, efficacy, followed by the undiscerning and unrestricted consumption of antibiotics resulted in undue evolution in microbes in the form of multidrug resistance eventually resulting in the cultivation of new challenges to develop the new-generation antimicrobial therapy. A critical need for the development of novel, broad-spectrum therapeutics has thus arrived. The Silver nanoparticles (AgNPs) over the last few years have gained immense reputation as the next-generation antibiotics owing to their broad-spectrum activity against the disease-causing microbes which has been also extended against the highly evolved MDR strains. Also known to support the synergistic effect in combination with various commercially used antibiotics, the potential of AgNPs could be extensively exploited to gradually replace the old-generation drugs that certainly have lost their tooth against the resistant microbes.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0552-1
      Issue No: Vol. 8, No. 4 (2018)
       
  • Cytotoxic and Antitumor Activity of Liposomal Silibinin
    • Authors: Nataliya B. Feldman; Tatiana I. Gromovykh; Natalia E. Sedyakina; Ivan I. Krasnyuk; Sergey V. Lutsenko
      Pages: 971 - 976
      Abstract: The cytotoxic and antitumor effect of liposomal form of silibinin was studied. It was shown that the liposomal silibinin reveals more pronounced cytotoxic activity in vitro against HeLa (cervix carcinoma), HT1080 (fibrosarcoma), and MCF-7 (breast adenocarcinoma) human tumor cell lines compared with non-liposomal silibinin. In vivo experiments demonstrated a possibility of parenteral use of the liposomal form. It was demonstrated that intravenous administration of liposomal silibinin has a significant antitumor effect in vivo against murine adenocarcinoma of Ca 755 and leads to inhibition of tumor growth (53.6%) and an increase (49.4%) in the mean life span of experimental animals compared to untreated control and animals receiving non-liposomal forms (free silibinin and its mixture with lecithin) administered orally.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0556-x
      Issue No: Vol. 8, No. 4 (2018)
       
  • Effect of Molecular Characteristics and Morphology on Mechanical
           Performance and Biocompatibility of PLA-Based Spongious Scaffolds
    • Authors: T. E. Grigoriev; T. B. Bukharova; A. V. Vasilyev; G. E. Leonov; Y. D. Zagoskin; V. S. Kuznetsova; V. I. Gomzyak; D. I. Salikhova; E. V. Galitsyna; O. V. Makhnach; K. V. Tokaev; S. N. Chvalun; D. V. Goldshtein; A. A. Kulakov; M. A. Paltsev
      Pages: 977 - 983
      Abstract: The effect of molecular characteristics and morphology on mechanical performance and biocompatibility of PLA-based spongious scaffolds was studied. PLLA and PDLLA with different molecular weight were studied. It was shown that the structure and the mechanical properties of PLA sponges slightly depend on the molecular mass of the polymer. In the contrary, porosity of the sponge-like material has great effect on its mechanical properties. Biocompatibility tests showed that PLLA provide better matrix behavior compared to PDLLA for the stem cells from human exfoliated deciduous teeth.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0557-9
      Issue No: Vol. 8, No. 4 (2018)
       
  • Calcium Transient and Quantal Release in Mouse Neuromuscular Junction
           Under Extracellular Calcium Concentration Change
    • Authors: Dmitry V. Samigullin; Nikita V. Zhilyakov; Eduard F. Khaziev; Ellya A. Bukharaeva; Eugeny E. Nikolsky
      Pages: 984 - 987
      Abstract: In mouse neuromuscular junction, the amplitude of the presynaptic calcium (Ca2+) transient was measured and correlated with mediator release at different extracellular Ca2+ concentrations. Fluorescent calcium-sensitive dye Oregon Green 488 BAPTA 1 hexapotassium salt was used for Ca2+ transient registration. The quantal content of release was assessed by the amplitude of the endplate potentials (EPPs) and was measured using intracellular microelectrodes. The amplitude of the EPPs changed more significantly than the amplitude of the Ca2+ transient when the extracellular calcium concentration was changed. Linear approximation of the dependence of the quantal content on the amplitude of the Ca2+ transient on double logarithmic scale gave a slope showing that the biochemical cooperativity was 2.86. The obtained value is comparable with the data calculated earlier in the neuromuscular junction of the rat and other synapses using electrophysiological measurements. Our data suggest that the change of the Ca2+ transients recorded from the whole volume of the nerve terminal properly reflects the variation of calcium concentration responsible for the neurotransmitter release in active zone. Thus, analysis of the bulk Ca2+ transient can be used to evaluate the calcium entry into the nerve endings and compare it with the number of quanta released under different conditions.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0558-8
      Issue No: Vol. 8, No. 4 (2018)
       
  • Development of an Impedimetric Immunosensor for Specific Detection of
           Snake Venom
    • Authors: Ricardo Adriano Dorledo de Faria; Vanessa de Freitas Cunha Lins; Giancarlo Ubaldo Nappi; Tulio Matencio; Luiz Guilherme Dias Heneine
      Pages: 988 - 996
      Abstract: Serotherapy is the only approved method to treat victims of snakebites; therefore, it is very important to identify the type of venom implicated in the accident to ensure the most specific antivenom is administered to the patient. In Brazil, the majority of snakebite accidents are from snakes of Bothrops genus. In this work, we developed an immunosensor capable to recognize specifically venoms from Bothrops snakes based on the electrochemical impedance spectroscopy technique. For this, Crofer 22 APU steel was used as transducer substrate functionalized with antibothropic antibodies. The immunosensor was incubated with different concentrations of venoms from Bothrops, Crotalus, and Micrurus in order to evaluate its specificity. The formation of the antigen-antibody immunocomplex at the surface of the transducer substrate increased the leakage resistance in a concentration-dependent manner when the device was exposed to the bothropic venom, while no considerable variation of this parameter could be observed for the venoms of the heterologous genera. In addition to the observed specificity, the sensor proved reusable, since the immersion in an elution buffer permitted many regeneration and charge cycles without considerable loss of activity. The results strongly indicated that the developed immunosensor stands as a promising device to aid in snakebites diagnosis.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0559-7
      Issue No: Vol. 8, No. 4 (2018)
       
  • A Critical Review of Heat Transfer Characteristic Using Nanofluid Flow
           Around a Set of 2D Cylinder Arrangements'
    • Authors: Soufiya Mizani; Hicham Zerradi; Sanaa Rochd; Aouatif Dezairi; Rachida Moultif
      Pages: 1021 - 1034
      Abstract: Our paper includes the results of a numerical simulation performed to study the nanofluid flow around a set of 2D cylinder arrangements. Two types of nanofluids involving Al2O3 and CuO nanoparticles dispersed separately in base fluids of water and ethylene glycol mixture 60:40; those nanofluids were taken to evaluate their effect on the flow around different equilateral-triangular arrangements of cylinders. The continuity and the momentum equations have been numerically solved by using a special technic named “SIMPLE algorithm.” Besides, the thermo-physical parameters of nanofluids have been evaluated using the theory of one fluid phase; thus, contemporary correlations of thermal conductivity and viscosity of nanofluids have been used in this paper as well as our previous work (Int J Adv Technol 7(4)0976–4860, 2016). The correlations are functions of particle volumetric concentration as well as temperature. The results of heat transfer characteristics of nanofluid flow around 2D cylinder arrangement revealed clear improvement compared with the base fluids. This enhancement is very interesting in engineering of flows with different equilateral-triangular arrangement characteristics of cylinders, while the gap ratios (G/D) of the three cylinders and incidence angle exert an enhancement efficiency influence on the heat transfer characteristics. The achieved results indicate that the use of aspect ratio 2.26 and incidence angle 1.98° leads to the high amounts of heat transfer inside the tube. In this study, the results obtained can be a fruitful source for developing and validating of new codes both in a scientific and commercial manner.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0529-0
      Issue No: Vol. 8, No. 4 (2018)
       
  • Application of Fluid–Structure Interaction Methods to Estimate the
           Mechanics of Rupture in Asian Abdominal Aortic Aneurysms
    • Authors: Tejas Canchi; Ashish Saxena; EYK Ng; Esley CH Pwee; Sriram Narayanan
      Pages: 1035 - 1044
      Abstract: Abdominal aortic aneurysms (AAAs) occur because of dilation of the infra-renal aorta to more than 150% of its initial diameter. Progression to rupture is aided by several pathophysiological and biomechanical factors. Surgical intervention is recommended when the aneurysm maximum transverse diameter (DAAA) exceeds 55 mm. A system model that incorporates biomechanical parameters will improve prognosis and establish a relationship between AAA geometry and rupture risk. Two Asian patient-specific AAA geometries were obtained from an IRB-approved vascular database. A biomechanical model based on the fluid–structure interaction (FSI) method was developed for a small aneurysm with DAAA of 35 mm and a large aneurysm with a corresponding diameter of 75 mm. The small aneurysm (patient 1) developed a maximum principal stress (PS1) of 3.16e5 Pa and the large aneurysm (patient 2) developed a PS1 of 2.32e5 Pa. Maximum deformation of arterial wall was 0.0020 m and 0.0022 m for patients 1 and 2 respectively. Location of maximum integral wall shear stress (WSS) (fluid) was different from that of PS1. Induced WSS was also higher in patient 1 (18.74 Pa vs 12.88 Pa). An FSI model incorporating the effect of both the structural and fluid domains aids in better understanding of the mechanics of AAA rupture. Patient 1, having a lower DAAA than patient 2, developed a larger PS1 and WSS. It may be concluded that DAAA may not be the sole determinant of AAA rupture risk.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0554-z
      Issue No: Vol. 8, No. 4 (2018)
       
  • Studying of Surfactant Excess Separation from Non-aqueous Quantum Dots
           Solution on its Monolayer Formation Process
    • Authors: Ammar J. Al-Alwani; K. I. Kosolapova; A. S. Chumakov; V. O. Lukyanova; I. A. Gorbachev; А. V. Kazak; А. I. Smirnova; S. N. Shtykov; N. V. Usol’tseva; E. G. Glukhovskoy
      Pages: 1081 - 1086
      Abstract: Controlled purification of non-aqueous solution of CdSe/CdS/ZnS quantum dots (QD) (dispersed in toluene or chloroform) from an excess of surfactant (oleic acid) was studied. The separation of unbound oleic acid from QD solution was carried out by using high-density polyethylene (HDPE) membrane. The secondary solution with a separated surfactant as well as initial QD solution was spread over the water surface to obtain a monolayer with its compression isotherms studied using Langmuir-Blodgett (LB) technique. This approach allowed us to determine the concentration of surfactant at a level of 10−5 mol/l or less for CdSe/CdS/ZnS QD. For better understanding of the influence of purification on the properties of QD, the monolayer of QD was transferred onto solid substrate and its morphology was studied. Atomic force microscopy showed that removal of oleic acid excess results in a more uniform and dense packing of quantum dots.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0537-0
      Issue No: Vol. 8, No. 4 (2018)
       
  • Synthesis, MR Relaxivities, and In Vitro Cytotoxicity of
           3,5-Diiodo-L-tyrosine-Coated Gd 2 O 3 Nanoparticles
    • Authors: Md Wasi Ahmad; Mohammad Yaseen Ahmad; Mazhar Ul-Islam; Wenlong Xu; Tirusew Tegafaw; Aref A. Wazwaz; Ahmmed S. Ibrehem; Mohd Shariq Khan; In-Taek Oh; Kwon Seok Chae; Hyunsil Cha; Yongmin Chang; Gang Ho Lee
      Abstract: In this study, we report the synthesis and characterization of 3,5-Diiodo-L-tyrosine (DLT)-coated gadolinium oxide (Gd2O3) nanoparticles. The bonding status of DLT-coated Gd2O3 nanoparticles (DLT-NPs) were confirmed by Fourier transform infrared (FT-IR) absorption spectra and thermogravimetric analysis (TGA). The surface coating amount was estimated to be 73% in weight percent from a TGA. High-resolution transmission electron microscope (HR-TEM) shows that DLT-NPs were spherical in shape with an average diameter 2 nm. The MR relaxivity measurements confirmed that the DLT-NPs have higher r1 = 9.24 s-1 mM-1 than commercially available contrast agents. Furthermore, the bio-compatibility of the DLT-NPs were measured by cytotoxicity test, which has demonstrated that the cell viability reached up to 60% with Gd concentrations up to 50 μM for both DU145 and NCTC1469 cell lines, making them a promising candidate for biomedical applications.
      PubDate: 2018-12-07
      DOI: 10.1007/s12668-018-0582-8
       
  • Soret-Dufour Effects on Unsteady Flow of Convective Eyring-Powell Magneto
           Nanofluids over a Semi-Infinite Vertical Plate
    • Authors: Poulomi De
      Abstract: The aim of this paper is to study a two-dimensional free convective flow of Eyring-Powell Magneto nanofluid involving collective effects of thermal and mass diffusion with Soret-Dufour effects. The governing equations of the linear momentum, energy equation, and concentration are converted into non-dimensional non-linear ordinary differential equations with the facilitation of suitable group of similarity transformation. The transformed non-linear ordinary differential equations become coupled and numerically solved using the fifth-order Runge-Kutta-Fehlberg method in conjunction with the shooting technique by fitting proper boundary conditions. Computations are performed for many values of different governing parameters influencing the velocity, temperature, and concentration distributions, and obtained results are comprehensively analyzed.
      PubDate: 2018-12-06
      DOI: 10.1007/s12668-018-0583-7
       
  • Antoixidant, Antitumor, Antimicrobial Activities Evaluation of Musa
           paradisiaca L. Pseudostem Exudate Cultivated in Saudi Arabia
    • Authors: T. M. Abdel Ghany; Magdah Ganash; M. M. Alawlaqi; Aisha M. H. Al-Rajhi
      Abstract: The current study was designed to evaluate the therapeutic benefits of Musa paradisiaca L. pseudostem exudate including antioxidant, antitumor, and antimicrobial activities in vitro. Antioxidant activity determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging system. Antitumor activity performed on hepatocellular carcinoma (HepG-2) and human colon carcinoma (HCT-116), the antiviral activity of exudate was determined using cytopathic effect assay. Exudate showed good antioxidant activity where the value of IC50 was 2.2 μl. Antitumor activity reveals that the exudate is a good antitumor source with IC50 29.4 μl and 29.4 μl for HepG-2 and HCT-116 cell lines respectively. Exudate at 100 μl exhibited the highest cytotoxicity towards HCT-116 and HepG-2 cell line with inhibition 86.53and 79.06% respectively. From the obtained results, we could infer that the exudate does not have any antifungal effect on Aspergillus fumigatus (RCMB 002008), Candida albicans RCMB 005003, Candida tropicalis RCMB 005004 (1), Cryptococcus neoformas RCMB 0049001, Microsporum canis (RCMB 0834), and Trichophyton mentagrophytes (RCMB 0925) while antibacterial activity was observed on tested Gr + ve and Gr˗ve bacteria. Cytopathic effect exhibited weak antivirus against hepatitis A virus, while showing no antiviral against herpes simplex virus. Phytochemical screening confirmed the presence of active compounds like alkaloids, flavanoids, anthraquinone, cardiac glycoside, and phlobotannins in the pseudostem exudate of M. paradisiacal L. Altogether, these results suggest that the pseudostem exudate could be used as a potential antioxidant along with its antitumor and antibacterial agent.
      PubDate: 2018-12-06
      DOI: 10.1007/s12668-018-0580-x
       
  • Degrading of the Pseudomonas Aeruginosa Biofilm by Extracellular Levanase
           SacC from Bacillus subtilis
    • Authors: Elena Trizna; Mikhail I Bogachev; Airat Kayumov
      Abstract: Pseudomonas aeruginosa is an opportunistic pathogenic bacterium causing variety of biofilm-related infections in patients with burns, lung cancer, chronic obstructive pulmonary disease, and cystic fibrosis. Here, we show that extracellular levanase SacC from Bacillus subtilis disrupts the matrix biofilm of P. aeruginosa and this way increasing the efficacy of antibiotics against biofilm-embedded bacteria. In particular, the biofilm thickness decreased twofold after 2 h of treatment with levanase at 1 mg/ml, while 5 mg/ml of cellulase was required for the same effect. Next, in the presence of SacC, the efficacy of ciprofloxacin against biofilm-embedded P. aeruginosa increased fourfold. While the efficacy of amikacin in the presence of SacC increased fourfold against detached cell clumps, it remained unchanged against biofilm-embedded cells. These data suggest that extracellular levanase from B. subtilis could appear an alternative to other glycoside hydrolases reported to be active against biofilms of P. aeruginosa agent for external wound treatment to suppress biofilm formation and reduce reinfection risks.
      PubDate: 2018-12-01
      DOI: 10.1007/s12668-018-0581-9
       
  • Biosynthesis and Cytotoxic Study of Synthesized Zinc Oxide Nanoparticles
           Using Salvadora persica
    • Authors: Abdolhossein Miri; Mina Sarani
      Abstract: Salvadora persica extract was utilized as a mediate in the synthesis of zinc oxide nanoparticles (ZnO-NPs) under ambient conditions. The biosynthesized particles were characterized via UV-Vis, PXRD, FESEM, EDX, DLS, Raman, and FT-IR analysis. The UV-Vis studies of these particular nanoparticles revealed a characteristic peak at 383 nm, and PXRD pattern presented wurtzite structure (hexagonal) for the synthesized ZnO-NPs, suggesting the formation of ZnO nanoparticles. The FESEM image indicated that the biosynthesized particles were uniformly shaped in hexagonal with the average size of 60–130 nm at calcination temperatures of 500, 600, and 700 °C. On the other hand, the EDX clearly exhibited the presence of Zn and O elements in the biosynthesized sample. The powder x-ray diffraction (PXRD) and Raman studies confirmed the formation of single crystalline, hexagonal wurtzite ZnO structures. The cytotoxic activity of the biosynthesized nanoparticles against HT-29 cancer cell line was examined through MTT assay. The results indicated that the toxicity of synthesized nanoparticles is dependent on the concentration of nanoparticles.
      PubDate: 2018-11-29
      DOI: 10.1007/s12668-018-0579-3
       
  • Chitosan/Octadecylamine-Montmorillonite Nanocomposite Containing Nigella
           arvensis Extract as Improved Antimicrobial Biofilm Against Foodborne
           Pathogens
    • Authors: Sedef İlk; Mehmet Şener; Mehtap Vural; Sedat Serçe
      Abstract: The objective of this study was to develop inexpensive and facile nanocomposites based on chitosan and organo-clay with the antimicrobial affectivity that provide the serious challenges caused by bacterial infections in various products such as food packaging materials. The chitosan with octadecylamine montmorillonite (ODA-MMT) nanocomposites by supplementing 1, 2.5, and 5 w% Nigella arvensis seed (black cumin) extract (CMBC-1, CMBC-2.5, and CMBC-5) were prepared chitosan from ionic liquid solutions in the presence of ODA-MMT and black cumin extract suspension. The effect of black cumin with different content on the structure and antimicrobial activity of the nanocomposite have been investigated. The interactions between the chitosan matrix, ODA-MMT, and black cumin extract at different conditions were characterized both physicochemically (FT-IR, SEM, and XRD) and biologically (antimicrobial). The results indicated that the formation of exfoliated nanostructure of nanocomposites was provided by loading of nanodispersed clay in matrix. Antimicrobial activity of CMBC nanocomposite film was evaluated using disc diffusion method against Gram-negative bacteria Escherichia coli ATCC 25922 and Salmonella enterica serotype Typhimurium SL 1344 and Gram-positives Staphylococcus aureus ATCC 25923 and Streptococcus mutans ATCC 25175. The antimicrobial activity studies of the CMBCs illustrated that the nanocomposites could more strongly inhibit the growth of the tested Gram-negative bacteria than Gram-positive bacteria within increased content of black cumin from 1 to 5 w%. To our knowledge, this is the first report on the antimicrobial effect of CMBC nanocomposite film. Such biomaterials within nontoxic and inexpensive properties will thus have great potential applications in the development of new packing materials that can effectively prevent the antimicrobial formation. Graphical ᅟ
      PubDate: 2018-10-12
      DOI: 10.1007/s12668-018-0565-9
       
  • Synthesis and Characterization of Co-Polymer Nanocomposite Film and its
           Enhanced Antimicrobial Behavior
    • Authors: E. Muthusankar; S. Vignesh Kumar; Narendran Rajagopalan; D. Ragupathy
      Abstract: This work reports the synthesis, characterization, and antimicrobial activity of polyaniline/polyvinyl alcohol (PANI/PVA) and polydiphenylamine/polyvinyl alcohol (PDPA/PVA) co-polymer nanocomposite films. Initially, chemical oxidative polymerization was employed to synthesis PANI and PDPA by oxidizing aniline (AN) and diphenylamine (DPA) in the presence of ammonium peroxydisulfate (APS) as an oxidant. A trace amount of prepared PANI and PDPA were used to prepare nanocomposite films by solution casting technique, using PVA as a stabilizer. Surface morphological studies reveal the impregnated amorphous structure of PANI and PDPA size in the range of ~ 50–150 nm. Fourier transform infrared (FTIR) examines to confirm the presence of PANI, PDPA, and PVA in nanocomposite film. Disk diffusion approach was adopted to study the antimicrobial activity of PANI/PVA and PDPA/PVA nanocomposite films.
      PubDate: 2018-10-06
      DOI: 10.1007/s12668-018-0564-x
       
  • Cloning of Phytase Genes from Pantoea Sp. 3.5.1 and Bacillus ginsengihumi
           M2.11 in Pichia pastoris
    • Authors: Daria S. Troshagina; Aliya D. Suleimanova; Daria L. Itkina; Margarita R. Sharipova
      Abstract: Phytases (myo-inositol hexakisphosphate hydrolase) catalyze the hydrolysis of phytate to inorganic phosphate and less phosphorylated myo-inositol derivatives and are widely used as feed additives in animal nutrition. Nevertheless, nowadays, there is a constant search for new phytases and new expression systems for better production of these important enzymes. In this study, we report cloning of two novel bacterial phytases belonging to the different enzyme classes and having different properties in the methylotrophic yeast Pichia pastoris. Sequences of agpP and phyC genes, encoding histidine acid phytase from Pantoea sp. 3.5.1 and β-propeller phytase from Bacillus ginsengihumi M2.11, respectively, were optimized and chemically synthesized according to the P. pastoris codon usage bias. The optimized genes were cloned into the yeast vectors pPINK-HC and pPINK-LC under the control of the inducible promoter AOX1 and two different signal peptides—signal sequence of α-amylase gene from Aspergillus niger and presequence of inulinase gene from Kluyveromyces maxianus. PCR analysis, restriction analysis, and DNA sequencing confirmed correct integration of agpP and phyC genes into P. pastoris genome. As a result, recombinant strains of P. pastoris with codon-optimized bacterial phytase genes (agpP and phyC), encoding histidine acid and β-propeller phytases, integrated into the genome under the alcohol oxidase promoter AOX1 and two different signal peptides, were obtained. Recombinant phytase AgpP was stably expressed and secreted into the culture medium of yeasts, whereas the expression of phyC gene was only confirmed at transcription level.
      PubDate: 2018-09-27
      DOI: 10.1007/s12668-018-0563-y
       
  • Spatial Structure and Conformational Mobility of Seven-Membered Cyclic
           Acetals and Ketals Containing Pyridoxine Moiety in Solution by NMR Methods
           
    • Authors: I. Z. Rakhmatullin; L. F. Galiullina; A. A. Balandina; F. K. Karataeva; Y. G. Shtyrlin; V. V. Klochkov
      Abstract: In the last decade, pyridoxine derivatives were widely used for the synthesis of molecules with important biological and physical properties. However, rational synthesis of the compounds with desirable biochemical or physical properties often requires information about their spatial structure and conformational mobility. NMR spectroscopy is a powerful tool for conformational analysis of biologically important samples, such as pyridoxine derivatives, in solution. This paper is devoted to a review of the results obtained by our group over the last 5 years on the NMR study of nine newly synthesized pyridoxine derivatives in acetone solution. It was shown that studied compounds are involved into several conformational exchange processes. The activation energies of all observed conformational exchange processes were calculated.
      PubDate: 2018-09-19
      DOI: 10.1007/s12668-018-0562-z
       
  • An Anisotropic Analysis of Human Femur Bone with Walking Posture:
           Experimental and Numerical Analysis
    • Authors: Ritu Painkra; Shubhashis Sanyal; Arindam Bit
      Abstract: Load-bearing bones have a capacity to ground the load from the point of impact to the opposite end (distal end) of the same bone irrespective of the direction of (inclination) impact forces. This is only possible due to highly heterogeneous microstructure of bones. In such circumstances, it is unjustified to assume bone to be isotropic in nature. Therefore, a correction factor is introduced while assuming material property of the bone, and thus non-isotropic modeling was considered. In this study, stress analysis of proximal femur bone with isotropic and anisotropic (non-isotropic) material property is modeled while the reaction force corresponding to walking cycle is implemented at the femur head. The results showed a significant variation of 30–45% while evaluating Von-Mises stress and strain developed on the femur bone under different loading conditions. Maximum Von-Mises stress is found on the lateral-interior side of femur, while maximum strain is identified on the same plane near the neck region of femur head. This study concludes the significance of anisotropic modeling of femur bone subjected to variable loading condition.
      PubDate: 2018-09-17
      DOI: 10.1007/s12668-018-0560-1
       
  • Synthesis of Reduced Graphene Oxide-Silver Nanocomposites and Assessing
           Their Toxicity on the Green Microalga Chlorella vulgaris
    • Abstract: The growing demands for nanotechnology in the recent years have resulted in environmental release of nanomaterials. In the current study, reduced graphene oxide-silver nanocomposites (Ag-rGO) were synthesized by an easy method and their characteristics were determined using X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis), energy dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM) techniques. Subsequently, toxicity of Ag-rGO was examined on the marine microalga Chlorella vulgaris. After treatment of algal cells with different concentrations of Ag-rGO for 24 h, growth parameters have been significantly decreased. In addition, a considerable reduction in viability of the treated cells was designated. Further considerable effects of Ag-rGO treatments have been revealed by increments in the activities of a number of antioxidant enzymes and reductions in the photosynthetic pigment contents. Our results showed that the main toxic effects of Ag-rGO are associated with the presence of Ag nanoparticles in the structure of these nanocomposites.
      PubDate: 2018-09-15
      DOI: 10.1007/s12668-018-0561-0
       
  • Influence of Chemical Reaction and Nonlinear Thermal Radiation on
           Bioconvection of Nanofluid Containing Gyrotactic Microorganisms with
           Magnetic Field
    • Authors: Dulal Pal; Surya Kanta Mondal
      Abstract: This paper deals with the study of bioconvection in nanofluid containing motile gyrotactic microorganisms over an exponentially stretching sheet by considering nonlinear thermal radiation and transverse magnetic field. The governing nonlinear partial differential equations are first transformed into a set of nonlinear ordinary differential equations along with appropriate boundary conditions by using appropriate similarity transformations. Then, these equations are solved numerically by fifth-order Runge-Kutta-Fehlberg integration scheme with shooting technique. The influence of various important physical parameters and bioconvection parameter on velocity, temperature, concentration of nanoparticle, rescaled density of gyrotactic microorganism, local skin friction, Nusselt number, Sherwood number, etc. are studied graphically. It is found that an increase on the bioconvection Lewis number, bioconvection Peclet number, and concentration difference of motile microorganism parameter give rise to the density of motile microorganism. Also, nanoparticle concentration increases by increasing the chemical reaction parameter whereas it decreases by increasing the nonlinear thermal radiation parameter.
      PubDate: 2018-09-05
      DOI: 10.1007/s12668-018-0555-y
       
 
 
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