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Publisher: Springer-Verlag (Total: 2351 journals)

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Showing 1 - 200 of 2351 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 2)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 26, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 8, SJR: 0.752, CiteScore: 3)
Abdominal Radiology     Hybrid Journal   (Followers: 17, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 29, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 31, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 19, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 7, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 13, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 21, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 2, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 4, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 3, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 18, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 25, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 18, SJR: 1.005, CiteScore: 2)
Adsorption     Hybrid Journal   (Followers: 5, SJR: 0.703, CiteScore: 2)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 37, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 20, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 58, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 32, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.475, CiteScore: 2)
Advances in Polymer Science     Hybrid Journal   (Followers: 45, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 11, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 21, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
AGE     Hybrid Journal   (Followers: 7)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 6, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Open Access   (Followers: 14, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Open Access   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Open Access   (Followers: 15, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 14, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 29, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 9, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 18, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 5, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 16, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 20, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 17, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 34, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 13)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 3, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 18, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 4, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 50, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 6, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 9, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 13, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 9, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (Followers: 1, SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 66, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 10, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 25, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 22, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 37, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 14, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 21, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 68, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 157, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 9, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 17, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 2, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 2, SJR: 0.766, CiteScore: 1)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 18, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 10, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 13, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.185, CiteScore: 2)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 13, SJR: 0.353, CiteScore: 1)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 3, SJR: 0.187, CiteScore: 0)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 19, SJR: 0.855, CiteScore: 1)
Asian Business & Management     Hybrid Journal   (Followers: 9, SJR: 0.378, CiteScore: 1)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 11)
Asian J. of Criminology     Hybrid Journal   (Followers: 6, SJR: 0.543, CiteScore: 1)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 4, SJR: 0.548, CiteScore: 1)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.183, CiteScore: 0)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 22, SJR: 3.385, CiteScore: 5)

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Similar Journals
Journal Cover
Applied Magnetic Resonance
Journal Prestige (SJR): 0.319
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1613-7507 - ISSN (Online) 0937-9347
Published by Springer-Verlag Homepage  [2351 journals]
  • A Simple, Accurate Method to Determine the Effective Value of the Magnetic
           Induction of the Microwave Field from the Continuous Saturation of EPR
           Spectra of Fremy’s Salt Solutions. Representative values of $$T_{1}$$ T
           1
    • Abstract: A simple protocol to measure the effective value of the circularly polarized magnetic induction of the microwave field is proposed and demonstrated employing continuous-wave saturation of a standard sample of Fremy’s salt measured under specified conditions. The fact that the doubly integrated intensity of first-derivative spectra is invariant with respect to the line shape is used to take into account the non-Lorentzian line shape to study the peak-to-peak intensity or the line width. Corrections for the use of line- rather than point-samples are developed.
      PubDate: 2019-03-21
       
  • Detection of Magnetosome-Like Structures in Eukaryotic Cells Using
           Nonlinear Longitudinal Response to ac Field
    • Abstract: Although magnetosomes have been discovered in bacteria since several decades, until today the question remains open whether such biomineralized structures do exist in eukaryotic cells. Herein, evidence was provided for the existence of magnetosome-like Fe-based structures in different viable eukaryotic cells by the registration of second harmonic of magnetization M2(H) of longitudinal nonlinear response to weak ac field. The behavior of the field hysteresis of the M2 response from cells in suspension and/or in pellet indicated a multi-domain state of magnetosome-like structures in certain type of cells, and a single-domain state in other cell lines. The amounts of magnetosomes in cells range from ≤ 1÷2 to 5÷8 per cell. The presence of magnetosome-like structures was analyzed in normal tissue samples obtained from Wistar rats and C57/Bl6 mice. Additionally, the tumor tissue (orthotopic rat C6 glioma and mouse GL261 glioma) were assessed for magnetosomes. Detected magnetosomes in certain tissues (i.e., brain, heart, lungs) matched to a single-domain magnetite nanoparticle, whereas in other organs they exhibited characteristics attributable to a multi-domain state, better corresponding to Fe(0) composition of their magnetic cores. Subsequent studies are necessary to elucidate the role of the Fe-based magnetosome-like structures in the biology and physiology of eukaryotic cells.
      PubDate: 2019-03-20
       
  • EPR and Mössbauer Characteristics of Aqueous Solutions of 57
           Fe-Dinitrosyl Iron Complexes with Glutathione and Hydroxyl Ligands
    • Abstract: Our electron paramagnetic resonance (EPR) studies have demonstrated that at 293 K and 77 K, the spin–lattice relaxation time, T1, of paramagnetic mononuclear dinitrosyl iron complexes (M-DNICs) with glutathione and hydroxyl ligands containing isotopes 57Fe and 56Fe notably exceeds the halflife of the Mössbauer transition, i.e., the lifetime of the 57Fe nucleus in the first excited state (10−7 s). The Mössbauer spectra of M-DNIC with hydroxyl ligands, binuclear DNIC with glutathione (B-DNIC) and sodium dithionite-treated solution of B-DNIC with glutathione did not display the presence of the magnetic hyperfine structure (MHFS) characteristic of M-DNIC with glutathione. The Mössbauer spectra of all these DNICs were characterized by quadrupole splitting. The results of a comprehensive comparative analysis of MHFS of M-DNIC with glutathione and that in DMF reduced sodium nitroprusside suggest that M-DNIC with glutathione have a low-spin (S = ½) d7 electronic configuration with the predominant localization of the unpaired electron on the d z 2 orbital of iron. This conclusion is fully consistent with the results of our previous studies of M-DNIC using the EPR method.
      PubDate: 2019-03-15
       
  • Multeity of Magnetic Resonance and Its Applications
    • PubDate: 2019-03-14
       
  • Characterization of the Distribution of Spin–Lattice Relaxation Rates of
           Lipid Spin Labels in Fiber Cell Plasma Membranes of Eye Lenses with a
           Stretched Exponential Function
    • Abstract: The stretched exponential function (SEF) was used to analyze and interpret saturation recovery (SR) electron paramagnetic resonance (EPR) data obtained from spin-labeled porcine eye-lens membranes. This function has two fitting parameters: the characteristic spin–lattice relaxation rate (T1str−1) and the stretching parameter (β), which ranges between zero and one. When β =1, the function is a single exponential. It is assumed that the SEF arises from a distribution of single exponential functions, each described by a T1 value. Because T 1 −1 s are determined primarily by the rotational diffusion of spin labels, they are a measure of membrane fluidity. Since β describes the distribution of T 1 −1 s, it can be interpreted as a measure of membrane heterogeneity. The SEF was used to analyze SR data obtained from intact cortical and nuclear fiber cell plasma membranes extracted from the eye lenses of 2-year-old animals and spin labeled with phospholipid and cholesterol analogs. The lipid environment sensed by these probe molecules was found to be less fluid and more heterogeneous in nuclear membranes than in cortical membranes. Parameters T 1str −1 and β were also used for a multivariate K-means cluster analysis of stretched exponential data. This analysis indicates that SEF data can be assigned accurately to clusters in nuclear or cortical membranes. In future work, the SEF will be applied to analyze data from human eye lenses of donors with differing health histories.
      PubDate: 2019-03-07
       
  • Multi-frequency Dynamic Weighted Functional Connectivity Networks for
           Schizophrenia Diagnosis
    • Abstract: Frequency-specific functional connectivity (FC) networks based on resting-state functional magnetic resonance imaging (rs-fMRI) have been successfully applied to the analysis and diagnosis of various mental illnesses, such as schizophrenia. However, most of the existing frequency-specific FC studies just focus on investigating the static temporal properties of FC networks, ignoring the important dynamic characteristics and spatial properties of FC networks. To address these issues, we proposed novel dynamic weighted FC networks to investigate the interactions among distributed brain regions. To take full advantage of the dynamic characteristics of the networks, temporal, spatial and spatio-temporal variabilities of dynamic networks were extracted as the classification features. To validate the effectiveness of our proposed method, we performed experiments on subjects with baseline rs-fMRI data from SchizConnect database. Experimental results demonstrated that the proposed method outperforms the state-of-the-art approaches in schizophrenia identification. In addition, we found most of the discriminative features distributed in frontal and subcortical area, which coincide with the pathological regions of cognitive progressing in schizophrenia patients.
      PubDate: 2019-03-01
       
  • Correction to: Analysis of the Regularization Parameters of Primal–Dual
           Interior Method for Convex Objectives Applied to 1 H Low Field Nuclear
           Magnetic Resonance Data Processing
    • Abstract: In the original publication, the acknowledgment section was not published and it is given below now.
      PubDate: 2019-03-01
       
  • Investigation on Unsaturated Hydraulic Conductivity with Nuclear Magnetic
           Resonance Technology and Instantaneous Profile Method
    • Abstract: Determination of the transient water content distribution in porous materials with both swiftness and accuracy during the unsaturated permeability tests seems somewhat difficult. The traditional water content measurement methods using relatively large probes generally, which exhibit inconvenience and inefficiency to some extent, do unavoidably some destructive exercises on the specimens. In this paper, the saturation (water content) distribution in a white Portland cement specimen that had a dry density of 1.35 g/cm3 was measured swiftly and non-destructively by employing the nuclear magnetic resonance (NMR) technology. Unsaturated hydraulic conductivities of the white Portland cement specimen corresponding to different suctions were obtained using the instantaneous profile (IP) method. It appears from the obtained results that under a dry density of 1.35 g/cm3, the unsaturated hydraulic conductivity of the white Portland cement varies between 10−11 and 10−7 m/s; with the decreasing suction, the hydraulic conductivity increases mildly and sharply, respectively, in the high and modest suction ranges, and stalls in the low suction range; and it enjoys both efficiency and preciousness to measure the water content distribution in the specimen with the NMR technology.
      PubDate: 2019-03-01
       
  • 250 MHz Rapid Scan Cross Loop Resonator
    • Abstract: A 25 mm diameter 250 MHz crossed-loop resonator was designed for rapid scan electron paramagnetic resonance imaging. It has a saddle coil for the driven resonator and a fine wire, loop gap resonator for the sample resonator. There is good separation of E and B fields and high isolation between the two resonators, permitting a wide range of sample types to be measured. Applications to imaging of nitroxide, trityl, and LiPc samples illustrate the utility of the resonator. Using this resonator and a trityl sample the signal-to-noise of a rapid scan absorption spectrum is about 20 times higher than for a first-derivative CW spectrum.
      PubDate: 2019-03-01
       
  • Portable Unilateral NMR Measuring System for Assessing the Aging Status of
           Silicon Rubber Insulators
    • Abstract: Silicon rubber insulators (SRIs) are widely used in power transmission lines as line support and as insulation between the line and the tower. Given that the aging of SRIs threatens the safety and stability of power grids, the accurate assessment of the aging status of SRIs is crucial. In this study, a portable unilateral magnetic resonance (UMR) measuring system for the nondestructive testing of the aging status of SRIs was proposed. The proposed NMR measurement system includes a mini UMR sensor and a measurement circuit. Details of the mini UMR sensor structure and low-cost circuit design were discussed. The Carr–Purcell–Meiboom–Gill sequence was used to record the 1H transverse relaxation curves of SRI sheds. Inverse Laplace transformation was employed to obtain the T2 distribution, and two peaks in the T2 distribution curve were observed. The long T2 component was selected to quantify the aging degree because of its stability compared with the short T2 component. To eliminate the inaccuracy of measurement introduced by the different chemical structures of SRIs produced by different companies, the aging status of the SRIs was represented by the changes in T2 between the surface and internal materials of the SRI.
      PubDate: 2019-03-01
       
  • Numerical Investigations of NMR T 1 – T 2 Map in Two-Phase
           Fluid-Bearing Tight Sandstone
    • Abstract: Study of two-dimensional nuclear magnetic resonance (NMR) longitudinal and transverse relaxation time (T1–T2) responses of tight reservoirs and optimization of T1–T2 acquisition parameter are of significance for exploration and development of tight oil and gas reservoirs. In this paper, a tight sandstone digital model was generated using a micro-CT scanning technique, and the random-walk method was modified to simulate the T1–T2 measurements in a two-phase fluid-bearing tight sandstone. The echo data of the saturation-recovery Carr–Purcell–Meiboom–Gill pulse sequence were acquired and processed to obtain a T1–T2 map. We compared oil–water-bearing tight sandstone T1–T2 maps with gas–water-bearing tight sandstone T1–T2 maps, and analyzed how fluid types, various degrees of fluid saturation, acquisition parameters, and signal-to-noise ratio (SNR) of NMR data affected T1–T2 maps. The research indicated that NMR T1–T2 logging is more suitable for identifying gas-bearing reservoirs, rather than oil-bearing reservoirs. NMR-logging acquisition parameters have different influences on various fluid-bearing tight sandstone T1–T2 maps. Increasing either the magnetic field gradient or echo spacing leads to a leftward shift of the gas signal, but does not affect the water signal and the oil signal in a T1–T2 map; the T1–T2 map with a mixed group of wait time is better than that with a long or short group of wait time in providing fluid relaxation information. The NMR data with lower SNR result in stronger divergence of fluid signal in T1–T2 map, rendering it more difficult to identify the fluid according to the map, and a data SNR more than 21 is recommended.
      PubDate: 2019-03-01
       
  • Optimization of MR Signal Contrast of the Lumbar Cartilaginous Endplates
           Using Ultra-Short TE
    • Abstract: The ultra-short TE (UTE) technique has been recently used to investigate lumbar cartilaginous endplates (CEPs). However, parameters of UTE have not been investigated, especially optimal second TE is unclear. The aim of this study was to investigate the use of an optimal second TE with UTE for visualizing CEPs. The subjects included 20 volunteers without LBP who did not undergo lumbar spine surgery. A UTE sequence with fat suppression was used, and TEs were set at 0.16 ms as first TE, and 4.6, 9.2, 13.8, 18.2 ms as second TE. Analyzed images subtracted each second TE image from first TE image. Two researchers measured contrast ratio (CR) between CEPs and vertebral bodies (VBs), intervertebral discs (IVDs). ICCs between two researchers were calculated for CRs (r = 0.924, 0.939). CR between CEP and VB of 13.8 and 18.4 ms was significantly higher than that of other TEs (p < 0.01). CR between CEP and IVD of 9.2 and 13.8 ms was significantly higher than that of other TEs (p < 0.01, 0.05). CEPs were evaluated using subtraction images obtained with UTE. The first TE was 0.16 ms, the optimal second TE was suggested to be 13.8 ms for evaluating human CEPs.
      PubDate: 2019-03-01
       
  • Pore Structure Evaluation of Bioclastic Limestone Using NMR and HPMI
           Measurements
    • Abstract: Pore structure evaluation is a crucial segment of revealing the reservoir characteristics and percolation mechanism. Considering the diversity of origins, types and combinations in reservoir space, the effective evaluation method of bioclastic limestone pore structure had not been built yet, which greatly restricted the comprehension of storage-permeability mechanism, as well as the subsequent development strategies. Therefore, this study systematically analyzed the corresponding relationship between the fractal characteristics of capillary pressure curves and pore connectivity. The T2 relaxation criterion of different pore diameter components were determined reasonably according to the features of nuclear magnetic resonance T2 spectrum. Combined with a fuzzy clustering algorithm, a new logging classification method was established using proportions of different pore components as sensitive parameters. The results showed that the capillary force curves of bioclastic limestone reservoir mainly exhibited two kinds of form: “convex” and “concave”. The former showed better storage-percolation characteristics; while the same characteristics of the latter were closely related to inflection points, degrading by the location of respective point from right to left; In addition, the relationship between the pore throat radius r and nuclear magnetic relaxation time T2 could be classified into four stages obviously. With the pore throat radius of 0.15, 1, 5 μm and T2 relaxation time 30, 90 and 200 ms, the pore structure of bioclastic limestone was effectively divided into four categories. On this basis, the calculation precision of permeability would be significantly improved.
      PubDate: 2019-03-01
       
  • Spin Diagnostics of Local Polytypic Composition of Silicon Carbide with
           Submicron Spatial Resolution
    • Abstract: A new diagnostic method for evaluation of the local polytypic composition of silicon carbide at room temperature is proposed using known and tabulated zero-field splitting values for spin color centers with S = 3/2 whose frequency parameters are in the megahertz range and depend on the specific polytype. The zero-field splitting values are recorded from the change in the photoluminescence in the near infrared, either under the optically detected magnetic resonance conditions or under the level anticrossing conditions of the spin centers. The proposed method can be used to identify silicon carbide known as carborundum in nature by recording optically induced radio frequency emission of spin color centers, including outer space.
      PubDate: 2019-03-01
       
  • The Structure and Internal Dynamics of R 6 - p -C 6 H 4 -R 6 Biradical:
           EPR, X-ray Crystallography and DFT Calculations
    • Abstract: A purposefully synthesized nitroxide biradical R6-p-C6H4-R6 (B1), where R6 is the 1-oxyl-2,2,6,6-tetramethyl-1,2,5,6-tetrahydropyridine group with a relatively short distance between the two radical sites, has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy. Hyperfine splitting (hfs) constants on the 14N atoms, electron spin exchange integral J , and the distance between the two N–O fragments rNO–NO were experimentally measured. Density functional theory, DFT, calculations were performed using the ORCA 4.0.1.2 program package. The optimized geometry was compared with X-ray crystallographic data and theoretical hfs constants were compared with the respective experimental EPR values. It is concluded that the current quantum chemical approaches provide good results in calculating hfs constants as well as some other EPR parameters. It is confirmed that the intramolecular electron spin exchange in biradicals analogous to B1 is realized by the indirect mechanism rather than direct collision of the N–O· groups. It is also shown that one can calculate and predict values of J in other similar biradicals based on the principle of “attenuation coefficients.
      PubDate: 2019-03-01
       
  • Development of a Microfluidic NMR Device for Rapid and Quantitative
           Detection of Tumor Markers
    • Abstract: In this work, a low-field microfluidic nuclear magnetic resonance (NMR) detection device was developed by fabricating a multi-layer microfluidic NMR probe. In combination with biological sensor technology based on immunomagnetic nanoparticles (IMNPs), the microfluidic NMR detection device was used to rapidly distinguish the concentration of target tumor markers. The experimental results show that the concentration of the target tumor markers can be differentiated with high sensitivity and specificity by the rate of the transverse relaxation time change ΔT2 even with interference from other biomarkers. A good linear relationship between ΔT2 and the concentration of the target tumor markers was also found, indicating that the microfluidic NMR device could be used for quantitative detection of tumor markers. Finally, the validity of the microfluidic NMR device for detecting target tumor markers was proved by comparison with a commercial cell counter, and the results detected by the two devices have a good consistency with a correlation coefficient of 0.996. In conclusion, the presented low-field microfluidic NMR device is a potential tool for the rapid and accurate quantitative detection of tumor markers.
      PubDate: 2019-03-01
       
  • Nuclear Magnetic Resonance and X-ray Reflectometry of Co/Cu Superlattices
    • Abstract: The state of interfaces in Co/Cu superlattices with various thicknesses of non-magnetic Cu layers (tcu) has been studied by the methods of nuclear magnetic resonance (NMR) and X-ray reflectometry. The samples glass/Fe(5 nm)/[Co(1.5 nm)/Cu(tcu)]10/Cr(3 nm) were fabricated by the method of magnetron sputtering on glass substrates under constant current in the ULVAC MPS-4000-C6 device. The 59Co NMR spectra were taken in a local magnetic field in the frequency range of 90–240 MHz at 4.2 K in the pulsed NMR spectrometer. The spin echo signal was formed by a sequence of two coherent radio-frequency pulses (τp)x − tdel − (τp)y − tdel – echo forming an alternate magnetic field with the round component amplitude H1 of about 10 Oe in a resonance coil. It has been shown both by NMR and X-ray reflectometry that the structure of interfaces deteriorates with an increase of the Cu layers thickness, and similar dependences of the parameters characterizing structural imperfection of interfaces were obtained by these two methods.
      PubDate: 2019-03-01
       
  • Study of Aliphatic Polyurethanes by the Low-Field 1 H NMR Relaxometry
           Method with the Inversion of the Integral Transformation
    • Abstract: In this paper, the distributions of the 1H nuclear magnetic resonance (NMR) spin–lattice and spin–spin relaxation times are used to characterize the mobility of different sections of macromolecules of aliphatic polyurethanes and the cross-linking density of polymer chains. The NMR relaxometry method with inversion of integral transformation is applied to study the effect of poly (ethylene glycol) and glycerol phosphate calcium on the polymer dynamics.
      PubDate: 2019-03-01
       
  • Design and Implementation of a Robust NMR Fluid Analyzer with Multiple
           Antennas
    • Abstract: During last 20 years, nuclear magnetic resonance (NMR) fluid analyzer is becoming a usual instrument to conduct researches to fluids several thousand meters underground in real time due to its nondestructive, rapid, and repeatable characteristics. In this paper, a new set of down-hole NMR fluid analyzer was designed and implemented. The probe of the analyzer employs special ring-shaped magnets which can be fastened to a high permeability material with a card slot. This design can decrease the twist between adjacent magnet blocks and obtain a homogeneous magnetic field. Meanwhile, in the axis direction, a stabilization section was added to the polarized magnets for improving the polarization efficiency. Furthermore, the system adopts a multiple antenna structure, by which it can achieve multi-parameter and multi-function measurements. To match with the antenna structure, an antenna control module was put to the circuit system to quickly switch the working antenna. Then, the performance of this new designed system was validated by both stationary and flow fluid. In the future, the analyzer can be combined with the formation tester for down-hole fluid analysis or used independently for ground fluid analysis during oil exploitation and transportation.
      PubDate: 2019-03-01
       
  • Multinuclear Applications on 0.5 T Magnetic Resonance Scanner
    • Abstract: The article describes experiments on the detection of nuclear magnetic resonance (NMR) signals from nuclei other than protons on low field (0.5 T) clinical MR scanner. The possibility of obtaining NMR spectra and MR imaging (MRI) from nuclei with a high natural abundance (19F, 31P, 11B, 23Na), as well as isotope-enriched samples (13C and 2H), is presented. The possibilities of recording NMR spectra for low-sensitivity nuclei (13C, 29Si, 2H, 17O, 14N) are shown. Special attention is paid to the detection of NMR signal from perfluorocarbons (PFC). The examples of 19F MRI of PFC obtained in the in vivo study of both animals and human are presented. The 19F MRI of fluorinated gas, which can be used as a contrast agent for lung imaging, was also obtained. The opportunity of increasing 13C NMR signal from PFC by polarization transfer from fluorine nuclei is demonstrated. It was shown that 23Na can be detected in NMR spectroscopy and MRI of animal and human. The prospects of 17O NMR for technology applications are noticed.
      PubDate: 2019-03-01
       
 
 
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