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  • 1
    Online Resource
    Online Resource
    Saint Louis :Elsevier Science & Technology,
    Keywords: Bacteria. ; Electronic books.
    Description / Table of Contents: Bacterial Physiology focuses on the physiology and chemistry of microorganisms and the value of bacterial physiology in the other fields of biology. The selection first underscores the chemistry and structure of bacterial cells, including the chemical composition of cells, direct and indirect methods of cytology, vegetative multiplication, spores of bacteria, and cell structure. The text then elaborates on inheritance, variation, and adaptation and growth of bacteria. The publication reviews the physical and chemical factors affecting growth and death. Topics include hydrogen ion concentration and osmotic pressure; surface and other forces determining the distribution of bacteria in their environment; dynamics of disinfection and bacteriostasis; bacterial resistance; and types of antibacterial agents. The text also ponders on the anaerobic dissimilation of carbohydrates, bacterial oxidations, and autotrophic assimilation of carbon dioxide. The selection is a dependable reference for readers interested in bacterial physiology.
    Type of Medium: Online Resource
    Pages: 1 online resource (724 pages)
    Edition: 1st ed.
    ISBN: 9781483274850
    DDC: 589.95
    Language: English
    Note: Front Cover -- Bacterial Physiology -- Copyright Page -- Table of Contents -- Contributors -- Preface -- Chapter 1. Chemistry of the Bacterial Cell -- I. Introduction -- II. Form and Size -- III. Chemical Composition of the Cell -- IV. Direct Methods of Cytology -- V. Indirect Methods of Cytology -- Chapter 2. The Structure of the Bacterial Cell -- I. Cell Structure -- II. The Spores of Bacteria -- III. Vegetative Multiplication -- IV. Cell and Environment -- Chapter 3. Inheritance, Variation, and Adaptation -- I. The Gene Theory -- II. Genetic Variation -- III. Characteristics of Bacterial Mutants -- IV. Interclonal Variation -- V. Variation and Adaptation: Recapitulation -- Chapter 4. Growth of Bacteria -- I. Introduction -- II. Quantitative Studies of Bacterial Growth -- III. Growth and Population Cycle of a Bacterial Culture -- IV. Conclusion -- Chapter 5. Physical Factors Affecting Growth and Death -- I. Temperature -- II. Hydrogen Ion Concentration and Osmotic Pressure -- III. Surface Tension -- IV. Oxidation-Reduction Potential -- V. Radiations -- VI. Surface and Other Forces Determining the Distribution of Bacteria in Their Environment -- Chapter 6. Chemical Factors Affecting Growth and Death -- I. Introduction -- II. Chemical Injury to Active Proteins -- III. Dynamics of Disinfection -- IV. Dynamics of Bacteriostasis -- V. Bacterial Resistance -- VI. Types of Antibacterial Agents -- Chapter 7. Bacterial Nutrition-Chemical Factors -- I. General Outlook -- II. The Major Bacterial Growth Factors -- Chapter 8. Bacterial Enzymes and the Theory of Action -- I. Introduction -- II. Historical Aspects -- III. Nomenclature and Classification -- IV. Coenzymes and Related Compounds -- V. Special Methods Used in the Isolation and Study of Bacterial Enzymes -- VI. Theory of Enzyme Action -- VII. Various Factors Controlling Enzymatic Activity. , VIII. Origin and Concentration of Enzymes -- IX. Discussion of Various Groups of Enzymes -- Chapter 9. Anaerobic Dissimilation of Carbohydrates -- I. Introduction -- II. Nature of Anaerobic Dissimilation of Carbohydrates -- III. Early Views on Fermentation -- IV. Glycolysis -- V. Polysaccharides -- Chapter 10. Bacterial Oxidations -- I. Introduction -- II. Some Thermodynamic and Kinetic Approaches -- III. Reversible Oxidation-Reduction Systems of Biological Importance -- IV. Activating Proteins (Dehydrogenase) -- V. Types of Oxidation Enzymes -- VI. Inhibitors of Oxidation Enzymes -- VII. Coupled Oxidation-Reduction Systems: Krebs' Tricarboxylic Acid Cycle -- VIII. Aerobic Phosphorylations -- IX. Pathways of Biological Oxidation-Reductions. The Pasteur Effect -- X. "Oxidation-Reduction Potentials" in Bacteria -- XI. Bacterial Respiration -- XII. Respiration of Growing Cells and of Resting Cells -- XIII. Regulatory Mechanisms of Respiration -- XIV. Life without Oxygen. The Anaerobic Bacteria -- Chapter 11. Autotrophic Assimilation of Carbon Dioxide -- I. Introduction -- II. Chemoautotrophic Bacteria -- III. Photosynthetic Assimilation of Carbon Dioxide -- Chapter 12. Assimilation of Carbon Dioxide by Heterotrophic Bacteria -- I. Introduction -- II. Early Concepts of Function of CO2 -- III. Carbon Dioxide Assimilation and Concepts of Autotrophism and Heterotrophism -- IV. Types of CO2 Assimilation -- V. Replacement of Carbon Dioxide -- VI. Importance of Heterotrophic Assimilation of Carbon Dioxide in Biology -- Chapter 13. Organic Nitrogen -- I. Introduction -- II. Breakdown of Protein -- III. Breakdown of Amino Acids -- IV. Decarboxylation of Amino Acids -- V. Deamination of Amino Acids -- VI. Transamination -- VII. Racemization -- VIII. Biosynthesis of Amino Acids -- IX. Amino Acid Assimilation -- Chapter 14. Biological Nitrogen Fixation. , I. Biogeochemistry of Nitrogen -- II. Agents of Fixation -- III. Properties of the Enzyme System -- IV. Chemical Pathway of Fixation -- V. Comparative Biochemistry of Nitrogen Fixation -- Chapter 15. Mineral Metabolism -- I. Introduction -- II. Purification of Media -- III. Mineral Elements Required for Growth -- IV. Mineral Elements in Bacterial Enzymes -- V. Mineral Elements for Pigments and Antibiotics -- Chapter 16. The Comparative Biochemistry of Molecular Hydrogen -- I. Comparative Biochemistry -- II. Autotrophic and/or Heterotrophic Bacteria -- III. Other Acceptors of Hydrogen -- IV. The Liberation of Molecular Hydrogen -- V. Special Functions of Hydrogenase -- Chapter 17. Assimilation by Bacteria -- I. Introduction -- II. Manometric Observations on Assimilation -- III. Influence of Poisons on Assimilation -- IV. Carbon Balances in Assimilation Studies -- V. Oxidative Assimilation During Growth -- VI. Polysaccharide and Other Syntheses -- VII. Assimilation of Nitrogen -- Chapter 18. Degradation and Synthesis of Complex Carbohydrates -- I. Introduction -- II. Bacterial Polysaccharides -- III. Mechanisms of Synthesis -- IV. General Conclusions -- Chapter 19. Significance of Autotrophy for Comparative Physiology -- Chapter 20. Luminous Bacteria -- I. Introduction -- II. General Characteristics and Physiology -- III. Luminescence as a Reaction Rate Tool in Biology -- IV. General Implications -- V. Conclusion -- BIBLIOGRAPHY -- SUBJECT INDEX -- MICROORGANISM INDEX.
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  • 2
    Online Resource
    Online Resource
    Raleigh :Institution of Engineering & Technology,
    Keywords: Electronic books.
    Description / Table of Contents: For the first time, this book presents a comprehensive analysis, based on electrons controlling the ion channel gates. The theory and gating model are extensively linked to published experimental observations. The intrinsic simplicity of electron gating elucidates mechanisms important to the functions of nerve cells.
    Type of Medium: Online Resource
    Pages: 1 online resource (206 pages)
    Edition: 1st ed.
    ISBN: 9781613531822
    Series Statement: Materials, Circuits and Devices Series ; v.02
    DDC: 571.6/4
    Language: English
    Note: Intro -- Contents -- Preface -- Part I: Theory / Electron-Gated Ion Channels -- 1. Introduction -- 1-1. The electron-gating model -- 1-2. Electron gating of a sodium channel -- 1-3. Timing -- 1-4. Sodium channel current -- 1-5. Sensitivity -- 1-6. Amplification and negative conductance -- 1-7. Model parameters -- 2. Developing A Model -- 2-1. A single electron two-site model -- 2-2. Amplification -- 2-3. A small force constant -- 2-4. Calculating frequencies -- 2-5. Amplification by NH3 inversion resonance -- 2-6. A voltage dependent amplification factor -- 2-7. The amplification energy window -- 2-8. NH3 inversion frequency reduction -- 3. The SetCap Model -- 3-1. A circuit model for two-site electron tunneling -- 3-2. Defining a capacitance factor -- 3-3. Displacement capacitance -- 3-4. Time-constant capacitance -- 3-5. Displacement energy -- 3-6. Energy well depth -- 3-7. The SETCAP model for N tunneling sites -- 4. Amplified Electron Tunneling and the Inverted Region -- 4-1. Amplification and the Marcus inverted region -- 4-2. The Q10 temperature factor -- 4-3. Time constant -- 4-4. Contact resistance -- 4-5. Tunneling resistance -- 4-6. Electron tunneling site-selectivity -- 4-7. The amplification energy window and the inverted region -- 5. Gating and Distortion Factors -- 5-1. Sodium channel inactivation gate leakage -- 5-2. Ion channel gating -- 5-3. Inactivation gating and open-gate distortion -- 5-4. Sodium channel activation gates and distortion -- 5-5. Potassium channel gating and distortion -- 5-6. Edge distortion of inactivation gating -- 5-7. Multistate gating -- 6. Characterization and Validation -- 6-1. Electron gating model equations -- 6-2. Finite-range rate constants -- 6-3. Open-channel probability range and time constant -- 6-4. Rate curves using voltage-sensitive amplification -- 7. Flux Gating In Na+ and K+ Channels. , 7-1. Sodium channel flux gating -- 7-2. Sodium channel inactivation flux gating -- 7-3. Potassium channel flux gating -- 7-4. The influx gating latch-up effect -- 8. Far Sites, Near Sites, and Back Sites -- 8-1. Ion channel mapping -- 8-2. Far sites for inactivation, calcium signaling and memory -- 8-3. Near sites on the S4 -- 8-4. Back sites and hyperpolarization -- 8-5. Gating current -- 8-6. Charge immobilization -- 8-7. A calcium channel oscillator model using far sites -- 9. Electron-Gate K+ Channels -- 9-1. Activation and inactivation of Kv channels -- 9-2. Structural constraints for activation gating -- 9-3. Influx gating latch-up and TEA+sensitivity -- 9-4. K/Na selectivity ratio -- 9-5. C-type inactivation gating -- 9-6. Coupling between tunnel-track electrons -- 9-7. Kinetics and inactivation depend on far sites -- Part II: Experimental Microwave Investigation -- 10. Microwave Thermal Fluorescence Spectroscopy -- 10-1. Microwave spectroscopy for caged proteins -- 10-2. Microwave spectra for Blue Fluorescent Protein -- 10-3. Matching frequencies -- 10-4. Estimating parameters and sensitivity -- 10-5. Arginine and lysine hot spots -- 10-6. Calcium oscillators - microwave sensitivity -- 10-7. The first excited vibrational state -- 10-8. Mode switching at infrared frequencies -- Appendix -- A. Geometric calculations for an or-helix -- B. Time constant for a tunneling distance r -- Final Comments -- A brief review of the findings -- References -- Index.
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  • 3
    Publication Date: 2021-06-21
    Description: Earth's climate experienced a warming event known as the Middle Eocene Climatic Optimum (MECO) at ~ 40 Ma, which was an abrupt reversal of a long-term Eocene cooling trend. This event is characterized in the deep Southern, Atlantic, Pacific and Indian Oceans by a distinct negative δ18O excursion over 500 kyr. We report results of high-resolution paleontological, geochemical, and rock magnetic investigations of the Neo-Tethyan Monte Cagnero (MCA) section (northeastern Apennines, Italy), which can be correlated on the basis of magneto- and biostratigraphic results to the MECO event recorded in deep-sea sections. In the MCA section, an interval with a relative increase in eutrophic nannofossil taxa (and decreased abundances of oligotrophic taxa) spans the culmination of the MECO warming and its aftermath and coincides with a positive carbon isotope excursion, and a peak in magnetite and hematite/goethite concentration. The magnetite peak reflects the appearance of putative magnetofossils, while the hematite/goethite apex is attributed to an enhanced detrital mineral contribution, likely as aeolian dust transported from the continent adjacent to the Neo-Tethys Ocean during a drier, more seasonal climate during the peak MECO warming. Based on our new geochemical, paleontological and magnetic records, the MECO warming peak and its immediate aftermath are interpreted as a period of high primary productivity. Sea-surface iron fertilization is inferred to have stimulated high phytoplankton productivity, increasing organic carbon export to the seafloor and promoting enhanced biomineralization of magnetotactic bacteria, which are preserved as putative magnetofossils during the warmest periods of the MECO event in the MCA section. Together with previous studies, our work reinforces the connection between hyperthermal climatic events and the occurrence (or increased abundance) of putative magnetofossils in the sedimentary record.
    Description: Published
    Description: 32-45
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: Paleoproductivity ; MECO ; magnetofossils ; Monte Cagnero ; 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology ; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Publication Date: 2015-07-20
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 6
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 1944-1956 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ion–molecule reaction CH3++CH3CN is known to have an association channel leading to CH3CNCH3+ in competition with the exothermic binary channels H2CN++C2H4 and C2H5++HCN. This reaction has been modeled using a master equation treatment incorporating weak collisions. The parameters required for the Rice–Ramsberger–Kassel–Marcus (RRKM) treatment have been found from an ab initio investigation of the CH3+/CH3CN energy surface. A means of including capture rate coefficients in the RRKM approach is developed, in which only the hindered dipole rotation is coupled with the reaction coordinate at large separations. Existing experimental data from ion cyclotron resonance (ICR) spectroscopy and a selected ion flow tube are fitted by the model in the pressure range 10−7–0.3 Torr. The low pressure experimental results are accounted for by weak collisions of the complex with the bath gas (when M=He, 〈ΔEdown(approximately-greater-than) and 〈ΔRdown(approximately-greater-than)∼100 cm−1) corresponding to a collision efficiency β=0.05 for M=He and 0.14 for M=CH3CN. Unimolecular rate coefficients for the (CH3CNCH3+)* complex are calculated for all product channels at a range of temperatures from 300 to 600 K. The rate coefficient for radiative stabilization was found to be 225 s−1 at the conditions of the ICR experiment. The average lifetime of the complex was calculated to vary between 29 μs at 600 K to 0.47 ms at 300 K and the termolecular association rates from 3.4×10−24–9.8×10−23 cm6 s−1 (M=He) and from 6.7×10−23–2.2×10−21 cm6 s−1 (M=CH3CN) over the temperature range 600–300 K.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5780-5782 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The role of magneto-elastic interactions in controlling the magnitude of switching field and coercivity is investigated using sputter-deposited TbFe/FeCo multilayers. In the absence of long-range anisotropy in amorphous TbFe layers, along with negligible magneto-crystalline anisotropy in FeCo layers, reversal behavior in these multilayers is largely determined by stress-induced anisotropy. Results show that magneto-elastic constraints at the TbFe–FeCo interfaces arising due to different values of saturation magnetostriction in adjacent layers lead to biaxial stresses. This manifests itself as highly square and similar M–H loops measured in different directions in the plane of the films. The measured values of coercivity in these films (between 4.5 and 7.0 mT) are found to be in close agreement with theoretical coercivity values predicted on the basis of biaxial stress-induced anisotropy. Biaxial stresses resulting in corresponding stress-induced anisotropy were found to have interesting consequences vis-à-vis magnetization reversal. In particular, self-organized domain patterns are formed during reversal which are mediated by local stress state in the films. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1726-1732 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Analytical, numerical, and experimental studies of the nonlinear transmission of a Pt:ethynyl compound have been carried out. Based on a model for the electronic transitions derived from earlier work, optical limiting behavior that is both broadband across the visible and effective over a range of pulse lengths, is predicted. Detailed experimental results are presented which exhibit many of the theoretically predicted characteristics, including a broadband nonlinear response from 450 to 700 nm. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 94 (1987), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sixty women with genuine stress incontinence were consecutively assigned to one of four physiotherapy groups who were treated for 6 weeks by either (1) pelvic floor exercises (PFE) in hospital; (2) PFE and faradism; (3) PFE and interferential therapy; (4) PFE at home. Assessment before and after treatment was by 7-day bladder charts, urethral pressure profiles and perineometry. Approximately two-thirds of the hospital-treated patients (groups 1, 2 and 3) experienced marked or moderate subjective improvement and at 6 months, 27% were dry or almost dry. There was little difference in outcome between groups 1, 2 and 3 but hospital-based therapy was more effective than home treatment. Statistical analyses showed that there were significant improvements in the objective indices measured in the 45 hospital-treated patients. Successful treatment was more likely in younger patients, in those with lesser degrees of genuine stress incontinence and those who had had no previous pelvic floor surgery.
    Type of Medium: Electronic Resource
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