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  Subjects -> CHEMISTRY (Total: 849 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (598 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (42 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 32)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 17)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 227)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 14)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
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: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 164)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 212)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 3)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
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: 14)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 3)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 285)
Biochemistry Insights     Open Access   (Followers: 5)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
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: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
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: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 110)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
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: 2)
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: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 174)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 150)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 243)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
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: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
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: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 56)
Dalton Transactions     Full-text available via subscription   (Followers: 19)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

Journal Cover BioChip Journal
  [SJR: 0.368]   [H-I: 12]   [0 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1976-0280 - ISSN (Online) 2092-7843
   Published by Springer-Verlag Homepage  [2355 journals]
  • Relationship analysis of speech communication between salivary cortisol
           levels and personal characteristics using the Smartphone Linked Stress
           Measurement (SLSM)
    • Authors: Seoyeon Choi; Yoosun Hwang; Joonchul Shin; Jung-Sik Yang; Hyo-Il Jung
      Pages: 101 - 107
      Abstract: Salivary cortisol is frequently used as a biomarker of stress. However, no study has used salivary cortisol to evaluate stress levels related to personal characteristics with a paper-based lateral flow assay (LFA) strip and a smartphone holder, and a smartphone at the same time during simulated speech communication. In this paper, we investigated variations in levels of salivary cortisol, communication apprehension, and the effects of self-efficacy via the Smartphone Linked Stress Measurement (SLSM) that we have recently reported. Saliva samples were collected by 48 participants (30 male and 18 female) at three moments: immediately before public speaking (basal measurement), immediately after public speaking (speech measurement), and forty minutes after taking a rest (relaxed measurement). Results from the questionnaire showed that salivary cortisol levels, communication apprehension, and self-efficacy were significantly correlated. Also, anxiety about speaking can raise their stress levels during their speeches, as reflected in their increased cortisol levels. Therefore, this study establishes the effects of self-efficacy on communication apprehension and salivary cortisol.
      PubDate: 2017-06-01
      DOI: 10.1007/s13206-016-1202-8
      Issue No: Vol. 11, No. 2 (2017)
       
  • Microfluidic biochips for simple impedimetric detection of thrombin based
           on label-free DNA aptamers
    • Authors: Taemin Lim; Seung Yong Lee; Jeongsuong Yang; Seung Yong Hwang; Yoomin Ahn
      Pages: 109 - 115
      Abstract: This paper presents a proof-of-concept microfluidic aptamer-based sensor for thrombin point-of-care testing using electrochemical impedance spectroscopy. The disposable biosensor is composed of a polydimethylsiloxane (PDMS) channel layer over a glass substrate. The substrate surface has an Au working electrode and a Pt reference/counter electrode. In this study, human thrombin was used as a biomarker for disease diagnosis. An unlabeled aptamer specific to thrombin was immobilized on a working electrode and electrochemical impedance was measured as thrombin was injected into the biosensor. Thrombin was detected by measuring change in impedance. The proposed biochip had a detection range of 0.1–100,000 ng mL−1 for thrombin concentration and a limit of detection of 0.1 ng mL−1. The results indicated that our biochip could be an effective tool for other molecular diagnostic systems.
      PubDate: 2017-06-01
      DOI: 10.1007/s13206-016-1203-7
      Issue No: Vol. 11, No. 2 (2017)
       
  • A simple and real-time sensing of human serum albumin using
           antibody-modified CNT-FET
    • Authors: Tae Hyun Kim
      Pages: 116 - 120
      Abstract: Microalbuminuria is a key indicator for the treatment of cardiovascular or cerebrovascular diseases and death. Therefore, sensitive and specific detection methods of HSA in biological fluids especially in low concentration are necessary in diagnosis and preventive medicine. Here, nanostructured electrical immunosensor is demonstrated for the rapid, sensitive and selective detection of human serum albumin (HSA), using single-walled carbon nanotube (swCNT) field-effect transistor (FETs) functionalized with monoclonal anti-human serum albumin (mAHSA) via simple coating. The selective binding of HSA with mAHSA on the surface of swCNT induces the electrostatic gating effect to the swCNT-FET. The resulting sensor exhibited high sensitivity toward HSA in real time, with good selectivity. The proposed method provides a powerful platform for a real time, sensitive and selective monitoring of HSA in biological fluids.
      PubDate: 2017-06-01
      DOI: 10.1007/s13206-016-1204-6
      Issue No: Vol. 11, No. 2 (2017)
       
  • Propagating behavior comparison of analytes and background electrolytes in
           a concentration polarization process
    • Authors: Longnan Li; Daejoong Kim
      Pages: 121 - 130
      Abstract: Concentration polarization (CP) is an electrochemical phenomenon related to the concentration gradient (under a transversal electric field) near an ion selective membrane surface. During concentration polarization process, quantitatively investigate the background electrolyte (BGE) concentration distribution is a very challenging problem. In this study, we conducted transient simulations within 2D micro-nanochannel domain to capture the dynamic nature of concentration polarization process and compared the propagating behavior of analytes and BGE. The simulation results show that the depletion area of chloride ion and analyte are both increase with time at ohmic and limiting region. The normalized depletion area (NDA) differences increases with decreasing BGE concentration. For the high applied voltage (overlimiting region), chloride ion and analyte at the anodic side microchannel are depleted everywhere that the NDA tends to 1 after an increasing step because of the electroconvection effect. This means there is no depletion area (DA) differences between two species in this plateau region. These results tell us the fluorescent ion indicator can’t show the exact BGE concentration distribution during CP process and we need to find new technique to visualize the concentration field.
      PubDate: 2017-06-01
      DOI: 10.1007/s13206-016-1110-y
      Issue No: Vol. 11, No. 2 (2017)
       
  • Development of a 2-chamber culture system for impedimetric monitoring of
           cell-cell interaction
    • Authors: Kin Fong Lei; Meng-Tsan Tsai; Ming-Hong Zhong; Chia-Hao Huang; Ngan-Ming Tsang; Ming-Yih Lee
      Pages: 139 - 145
      Abstract: In cancer research, study of cell-cell interaction is important to understand tumor initiation, progression, metastasis, and therapeutic resistance. Conventionally, transwell system was adopted and cell proliferation was quantified by end-point bio-assays. The operations are labor-intensive and time-consuming while studying of the dynamic cellular responses of cell-cell interaction. Although impedance measurement was suggested to be a promising technique to monitor cellular responses, electrodes cannot be integrated into the transwell for the measurement purpose. In this work, a 2-chamber culture system incorporated with impedance measurement technique was developed to quantitatively study cell-cell interaction. The chamber was composed of 2 sub-chambers separated with a barrier. By this design, two types of cells could be independently cultured and concurrently monitored under common medium supplied. Cell-cell interaction was demonstrated by aberrant cell proliferation induced by the EGF secreted from the transfected cells cultured on another sub-chamber. Real-time and non-invasive monitoring of cell-cell interaction was successfully demonstrated. This work provides a practical solution for monitoring the dynamic cellular responses of cell-cell interaction during the culture course. It is a reliable and convenient platform and facilitate more quantitative assessments in cancer research.
      PubDate: 2017-06-01
      DOI: 10.1007/s13206-016-1207-3
      Issue No: Vol. 11, No. 2 (2017)
       
  • Rapid visual identification of bovine meat by loop mediated isothermal
           amplification combined with immunochromatographic strip
    • Authors: Yong-Jin Li; Jin-Yu Fan
      Pages: 8 - 13
      Abstract: Considering the factor of culture, religion, health and commerce, the development of a rapid, convenient and sensitive method is important for the detection of the presence of meat species in raw or processed foods. In this study, we employed loop mediated isothermal amplification (LAMP) for species-specific target gene amplification, and the amplicons were analyzed on the immunochromatographic strip (ICS) for the rapid visual identification of meat species. Bovine meat was selected as an example to confirm the performance of such assay. The LAMP based ICS method show good specificity, repeatability and has a limit of detection of 0.1% for beef in meat mixture. The whole detection process could be completed within 50 min. Our method is more convenient and rapid compared to classical LAMP. Moreover, it could be easily adapted to identify other types of meats, and it may be useful for food administration laboratories to carry out meat species identification in raw and processed foods.
      PubDate: 2017-03-01
      DOI: 10.1007/s13206-016-1102-y
      Issue No: Vol. 11, No. 1 (2017)
       
  • Assessment of endothelial cell growth behavior in thin film nitinol
    • Authors: Yanfei Chen; Mahdis Shayan; Woon-Hong Yeo; Youngjae Chun
      Pages: 39 - 45
      Abstract: Growing clinical needs for less invasive endovascular treatments necessitate the development of advanced biomaterials that exhibit low-profile and enhanced biocompatible properties. One of the endovascular devices is a stent graft, which contains a metallic backbone, covered with thin polymeric membranes such as Dacron® and expandable polytetrafluoroethylene (ePTFE). This device has been widely used for treating various vascular diseases and injuries. While the commercial materials including Dacron® and ePTFE have demonstrated a good feasibility, they were found to induce inflammatory vessel wall reactions with neointimal hyperplasia. Consequently, it causes re-narrowing of the lumen space and thrombogenic issues that ultimately lead the treatment failure. In this paper, we introduced a thin film nitinol (TFN) as an alternative graft material and evaluated the growth behavior of endothelial cells (EC) both qualitatively and quantitatively. As a proof-of-concept study, both untreated nonpatterned film (TFN) and surface treated TFN (S-TFN) materials were used. We compared the adhesion, growth, and proliferation of ECs on a solid (non-patterned) TFN with the two most widely-used commercial graft materials (Dacron® and ePTFE). The in vitro experimental results showed better adhesion and growth of ECs on TFN materials than either ePTFE or Dacron®. Specifically, S-TFN showed approximately twice number of ECs attached on the surface than any other materials tested in this study. In addition, in vivo swine study demonstrated that ECs had a relatively high proliferation on the micropatterrned S-TFN with ~50% surface coverage within two weeks. Both in vitro and in vivo study results of cell growth suggested that TFN materials could be a promising graft material for low-profile endovascular devices.
      PubDate: 2017-03-01
      DOI: 10.1007/s13206-016-1106-7
      Issue No: Vol. 11, No. 1 (2017)
       
  • Controlled production of monodisperse polycaprolactone microspheres using
           flow-focusing microfluidic device
    • Authors: Hyukjin J. Kwon; Suhyeon Kim; Sungwook Kim; Ju Hee Kim; Geunbae Lim
      Abstract: These days, biodegradable microsphere polymers have been attracting increasing interest as a cosmetic injectable filler. Particularly, polycaprolactone (PCL) microspheres are well known for their safety and long degradation time. However, these microspheres are usually produced by the conventional stirring method, which has an inherent drawback related to the size control of the microspheres; accurate size control is critical for the use of these microspheres as a filler. Here, we demonstrate the fabrication of monodisperse PCL microspheres in the size range of 26.6-161 μm using a flow-focusing microfluidic device. The acquired coefficient of variation of the solidified microspheres is approximately 4.5%; thus, these microspheres meet the requirement of being monodisperse. The study results show the feasibility of manufacturing PCL microspheres using a microfluidic device, and these microspheres have better morphological characteristics, thereby reducing pain and infection after their injection into the skin. Furthermore, the specific target size of the solidified microspheres is met. Therefore, undesired outcomes after microsphere injection through the dermis, such as phagocytosis and inflammatory reactions, are less likely to occur.
      PubDate: 2017-06-02
      DOI: 10.1007/s13206-017-1306-9
       
  • Flexible and implantable capacitive microelectrode for bio-potential
           acquisition
    • Authors: Seung Min Lee; Hang Jin Byeon; Bong Hoon Kim; Jungyup Lee; Ji Yoon Jeong; Joong Hoon Lee; Jin-Hee Moon; Cheolsoo Park; Hyuk Choi; Sang-Hoon Lee; Kwang-Ho Lee
      Abstract: Electrodes should be adhered onto the body steadily under motion, and implanted stably into the tissue without any damages while maintaining conformal contact. Although most electrodes are fabricated with biocompatible materials, they should be shielded from tissues to prevent mechanical delamination from the device itself and to avoid adverse effects such as irritation, allergic reactions, or inflammation. Herein, we demonstrate a simple process for the development of a flexible and implantable capacitive electrode based on a minimal incision accessible design with polyimide (PI) and Gold/Titanium (Au/Ti) layers and completely encapsulated in a polydimethylsiloxane (PDMS) substrate. Electrodes of three different sizes (recording site diameters of 1.8 mm, 2.8 mm, and 3.8 mm, respectively) were fabricated and examined in this work. Electrocardiography (ECG) was recorded in the dorsal area of the rat for 4 weeks for biological signal checkup. We obtained stable and robust ECG signals owing to the intrinsic property of capacitive coupling, with almost no leakage current compared to the direct contact electrode for the applied current over the range of 0 to 10 mA. These results indicate that our electrode can be used to detect bio-signals effectively in the long term, and can play a role in electroceuticals in the near future.
      PubDate: 2017-06-02
      DOI: 10.1007/s13206-017-1304-y
       
  • miRNA-mediated expression switch of cell adhesion genes driven by
           microcirculation in chip
    • Authors: Timur R Samatov; Vladimir V Galatenko; Nadezhda V Senyavina; Alexey V Galatenko; Maxim Yu Shkurnikov; Svetlana A Tonevitskaya; Dmitry A Sakharov; Uwe Marx; Hermann Ehrlich; Udo Schumacher; Alexander G Tonevitsky
      Abstract: Changes in cell adhesion molecule (CAM) expression and miRNAs regulating them are known to be involved in malignant progression in colon cancer. We investigated expression profiles of CAM genes and non-coding RNAs in CaCo2 colon cancer cells in static culture and under dynamic flow conditions perfused in microfluidic chip emulating physiological microenvironment. We incubated monolayers of CaCo2 cells in Transwell® units either under static conditions or under flow in a microfluidic chip. We identified 7 up-regulated CAM genes (CD44, CDH7, CEACAM5, CEACAM6, CYR61, L1CAM and VCAN), 7 down-regulated genes (COL12A1, FGA, FGB, FGG, GJA1, ITGA5 and LAMA1) and 69 miRNAs targeting them under the influence of microcirculation. The revealed network comprised CAM genes known to interact with each other and 13 miRNAs simultaneously regulating more than one of them. The discovered regulatory network comprising CAM genes and miRNAs is likely involved in normal functioning of intestine epithelium as well as in cancer progression.
      PubDate: 2017-06-02
      DOI: 10.1007/s13206-017-1305-x
       
  • Recent advances in the detection of methicillin resistant Staphylococcus
           aureus (MRSA)
    • Authors: John Hulme
      Abstract: According to the World Health Organization (WHO) 20% of all documented S. aureus infections are attributable to MRSA, although for some developing countries this value can exceed 80%. Thus the rapid and accurate detection of MRSA in low resource settings (LDR) is becoming essential. Yet conventional microbial detection methods take from 1-5 days to identify MRSA. Recently, new types of automated laboratory methods as well as advances in nucleic acid testing, microfluidic technology, immunosensors, biosensors and point of care testing have reduced the time to detection to <1 hr. This review examines the current limitations and advances in methodologies employed in the rapid detection of MRSA.
      PubDate: 2017-06-02
      DOI: 10.1007/s13206-016-1201-9
       
  • Three-dimensional in vitro gut model on a villi-shaped collagen scaffold
    • Authors: Banya Yi; Kyu Young Shim; Sang Keun Ha; Jeonghun Han; Hong-Hoa Hoang; Inwook Choi; Sungsu Park; Jong Hwan Sung
      Abstract: A three-dimensional (3D) tissue architecture provides essential cellular environmental cues for cell differentiation. We previously reported that Caco-2 human intestinal epithelial cells grown on a 3D villi-shaped scaffold composed of collagen created a tissue structure resembling the human intestinal villi. Here, we compared the absorptive and metabolic properties of Caco-2 cells cultured on the 3D villi with those in 2D monolayer. Cell growth was higher in the 3D villi model compared with the 2D monolayer, probably owing to an increase in the available surface area. Barrier functions were more in vivo-like in the 3D villi model in association with reduced expression of tight junction and transporter proteins. The specific activities of the metabolic enzyme and intestinal epithelial differentiation marker, alkaline phosphatase, were improved in the 3D villi model, whereas aminopeptidase activity was comparable in the two models. These results suggest that the 3D villi scaffold induces physiological changes in Caco-2 cells, related to the absorption and metabolism of drugs. This 3D villi model may serve as an alternative and improved in vitro gut model for studying drug metabolism and transport.
      PubDate: 2017-06-02
      DOI: 10.1007/s13206-017-1307-8
       
  • miRHunter: A tool for predicting microRNA precursors based on combined
           computational method
    • Authors: Insong Koh; Ki-Bong Kim
      Abstract: MicroRNAs (miRNAs) are small endogenous non-coding RNAs known to post-transcriptionally regulate gene expression in a broad range of organism. Since the discovery of the very first miRNAs, lin-4 and let-7, computational methods have been indispensable tools that complement experimental approaches to understand the biology of miRNAs. In this article, we introduce a web-based computational tool, miRHunter, that identifies potential miRNA precursors (pre-miRNAs) in the genomic sequences by using a combined computational method. The method coupled ab initio method with homology-based and hairpin structure-based methods. The miRHunter consists of five modules: 1) a preprocessing module, 2) an evolutionary conservation filter module, 3) a hairpin structure filter module, 4) a support vector machine module that evaluates preliminary pre-miRNA candidates derived from the previous two filtering modules, and 5) a post-processing module. The miRHunter system yielded the following average test results: 96.16%/93.23%, 96.00%/94.68%, and 95.87%/93.57% which are sensitivity (Sn) and specificity (Sp) for animal, plant, and overall categories respectively. The miRHunter system can complement experimental methods and allow wetlab researchers to screen long sequences for putative miRNAs as well as pre-testing miRNAs of interest. The microarray profiling experiments have supported that the clusters of proximal pairs of miRNAs are generally coexpressed. Therefore, the clustering or spatial localization information will be used to improve the accuracy of our system in further work. The miRHunter is available at http://www.bioinfoworld.com/.
      PubDate: 2017-05-15
      DOI: 10.1007/s13206-017-1210-3
       
  • PDMS microchannel surface modification with Teflon for algal lipid
           research
    • Authors: Jae Woo Park; Sangcheol Na; Myeongwoo Kang; Sang Jun Sim; Noo Li Jeon
      Abstract: This paper presents a simple method for modifying the polydimethylsiloxane (PDMS) microfluidic channels with Teflon for algal lipid research. When culturing and staining algae inside microfluidic devices, the small molecule dyes absorbed by the microchannel surface render it difficult for imaging and quantification. PDMS surface coated with Teflon-AF resists the absorption of hydrophobic dye molecules (i.e., BODIPY and Nile red) as confirmed using fluorescence microscopy. Here, we introduce a surface modification of PDMS microchannel using Teflon-AF using a procedure of filling and drying to directly treat the PDMS surface with perfluorinated materials. This method can be used to prevent the absorption of fluorescent probe and obtain clear fluorescence micrographs without background signal from absorbed dye molecules on PDMS microchannel. We confirmed that contact angle of Teflon-coated PDMS (116.4°) is higher than that of unmodified PDMS (106.1°) and thus more hydrophobic. Furthermore, Teflon-coated PDMS surface had ~80% of oxygen transfer rate compared to that of native PDMS and good transparency in all visible light regions. Based on these characteristics, we successfully validated the visualization and quantification of intracellular lipid droplets in microalgae C. reinhardtii using BODIPY. We believe that our new method will expand microfluidic applications on characterization of biological lipid with fluorescence probes and biochemical markers.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-017-1302-0
       
  • Application of paper EWOD (electrowetting-on-dielectrics) chip: Protein
           tryptic digestion and its detection using MALDI-TOF mass spectrometry
    • Authors: Inae Jang; Hyojin Ko; Gwangro You; Hyunji Lee; Seunghwi Paek; Heedo Chae; Jae Hwan Lee; Sunkyung Choi; Oh-Sun Kwon; Kwanwoo Shin; Han Bin Oh
      Abstract: A paper-based open EWOD chip was used for protein tryptic digestion, and the resulting peptides were analyzed using MALDI-TOF mass spectrometry to identify the proteins. Although on-chip protein digestion was previously demonstrated on a glass-based EWOD platform, this is the first report to show that a paper-based EWOD can also be used for protein digestion and further analysis by mass spectrometry. A number of protein digestion processes, i.e., disulfide bond reduction, alkylation, buffering, and tryptic digestion, can be successfully conducted on the paper-based EWOD chip. Furthermore, a “Y”-shaped junction design was shown to be effective in successfully manipulating a droplet for protein digestion. A paper-based EWOD platform offers a cheap and versatile avenue for biological applications.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-016-1208-2
       
  • Affinity characteristic of terminal sequence in vancomycin resistant
           Enterococcus (VRE) membrane peptides on nanobiosensor chip using localized
           surface plasmon resonance
    • Authors: Kyungmin Lee; Yo-Han Kim; Hunsang Jung; Hyun Ho Lee
      Abstract: In this study, specific binding affinity between vancomycin (VAN) conjugated 40-50 nm gold nanoparticles (Au NPs) implemented on a sensor chip and pentapeptide mimicking pathogenic VAN resistant Enterococcus (VRE) wall membrane was employed as nanosensor format based on localized surface plasmon resonance (LSPR). Two pentapeptides, which were also anchored to 5 nm Au NPs, having two different terminal sequences of d-Ala-d-Ala and d-Ala-d-Lac respectively were compared in specific binding affinity toward the VAN conjugated nanosensor. Binding affinity difference identified by the LSPR characteristic in the nanosensor was shown in absorbance intensity and absorption wavelength shift between the two different terminal pentapeptides. The absorbance intensity clearly indicated that the pentapeptide having terminal d-Ala-d-Lac showed less affinity toward VAN conjugated nanosensor chip than that having terminal d-Ala-d-Ala. It indicates that the VRE itself has relatively weak binding strength towards the VAN, which may be used as a probe molecule for the VRE. Therefore, in order to design a VRE sensor using the VAN affinity, an indirect LSPR method can be devised instead of direct LSPR method.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-016-1206-4
       
  • Integrated miRNA and mRNA expression profiling in response to eriodictyol
           in human endothelial cells
    • Authors: Seung Eun Lee; Hye Rim Park; Hong Duck Yun; Jeong-Je Cho; Hyun-Jong Ahn; Cheung-Seog Park; Yong Seek Park
      Abstract: Eriodictyol, a flavonoid commonly found in citrus fruits, shows neurotrophic, antioxidant, anti- inflammatory, and anti-cancer effects under diverse pathophysiological conditions such as vascular diseases. In this study, we evaluated whether eriodictyol modulates miRNA and mRNA expression. Using microarray analysis, we examined miRNA and mRNA expression in human endothelial cells treated with 10 μM of eriodictyol for 24 h. Using numerous bioinformatic systems, we evaluated the signatures of the potential biological processes and signaling pathways. Our results provide insight into the underlying molecular mechanisms of action of eriodictyol and suggest that eriodictyol can be used for therapeutic intervention in vascular disease.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-017-1303-z
       
  • Design and fabrication of devices for investigating cell-sheet stretch
    • Authors: Yang Liu; Yoshihiro Ojima; Masanobu Horie; Eiji Nagamori; Hideaki Fujita
      Abstract: Recently, many efforts have been made to investigate the cell stretch response through focal adhesions, which are usually utilized by cells cultured on elastic materials. However, not all stretch sensing is mediated through focal adhesions but from cell-cell contacts such as adherence junctions. To unveil the details of the stretch-sensing mechanism through cell-cell contacts, we developed a cell-sheet extension device for visualizing dynamic changes of individual living cells induced by external mechanical stretch. A cell-sheet is an ideal observation object, as it can be comprised merely of cells without any mechanical influences from external matrices while maintaining normal cell-cell adhesions as in the in vivo situation. Two microfluidic extension devices were designed and fabricated using a silicone elastomer, which were capable of extending a cell-sheet made from Caco-2 cells up to 1.3- and 1.5-fold from its original state. Based on the obtained results, we expected that such cell-sheet extension systems can be useful tools for understanding the mechanisms of cellular stretch sensing through cell-cell contacts in living cells.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-017-1301-1
       
  • Joule heating effects on two-phase flows in dielectrophoresis microchips
    • Authors: Ying Yan; Dan Guo; Shizhu Wen
      Abstract: Joule heating is a significant phenomenon in dielectrophoresis-based microfluidic devices due to the local amplification of the electric field around electrodes. This leads to the temperature rising in microchannel which would influence the bioactivity of samples in the microchannel. In this paper, a numerical simulation model considering joule heating effect, electric field, and flow field is proposed to describe dynamic behaviors of two-phase flows of the dielectrophoresis microchip. The experimental methods are applied to verify the rationality of model and joule heating effects on microchips under both AC (Alternating current) and DC (Direct current) electric fields are investigated in detail. In numerical simulation part, the difference between AC and DC electric fields is compared. According to the results, it is found that with the same effective voltage, DC electric field can generate more joule heat and flow in the microchannel obtained higher temperature. This is caused by that the electric field strength around the electrodes in the DC electric field is stronger than that of the AC electric field. Secondly, effects of dispersed phase and continuous phase flow velocity are investigated and temperature will decrease with the increasing of flow velocity. Also, it is found that the Joule heating effects improve the droplet velocity based on the results. Finally, an infrared camera is applied to monitor the thermal characteristics of the microchannel to ensure that the numerical simulation is reasonable. These results are expected to provide useful guidance for future designs of dielectrophoresis-based microdevices that will avoid joule heating effects or take advantage of joule heating effects.
      PubDate: 2017-03-03
      DOI: 10.1007/s13206-017-1209-9
       
  • Automated nucleic acids purification from fecal samples on a microfluidic
           cartridge
    • Authors: JinSeok Kang; Chinsung Park; Jangwon Lee; Junghyun Namkung; Seung Yong Hwang; Yeon Seok Kim
      Abstract: In this paper, we describe the development of a microfluidic cartridge and its controlling device for fully automated nucleic acid purification from fecal samples. All steps of the standard complicated process, including fecal sample pretreatment, lysis, washing, and elution, were integrated into a microfluidic cartridge that could be operated with minimal hands-on time requirement. The performance of the microfluidic cartridge was evaluated using fecal samples spiked with bacteria or virus as well as fecal microbiome analysis. Microfluidic cartridge-based nucleic acid purification exhibited similar or even higher performance compared to commercialized products with respect to the concentration and purity of bacterial DNA or viral RNA. It also showed a similar or higher detection capa city for microbiome diversity in clinical fecal samples, as well as similar or higher extraction efficiency from such samples. The development of microfluidic cartridge-based fully automated platform for nucleic acid purification from fecal samples may be an important milestone towards developing a point-of-care test for rapid and simple diagnosis of gastroenteritis and gut microbiome analysis.
      PubDate: 2017-01-04
      DOI: 10.1007/s13206-016-1205-5
       
 
 
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