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  • 1
    Online-Ressource
    Online-Ressource
    San Diego :Elsevier Science & Technology,
    Schlagwort(e): Molecular biology -- Mathematics. ; Biomathematics. ; Cytoskeleton -- Mathematics. ; Cells -- Morphology -- Mathematics. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (535 pages)
    Ausgabe: 1st ed.
    ISBN: 9780080528076
    DDC: 572.8/0151
    Sprache: Englisch
    Anmerkung: Front Cover -- Biomathematics: Mathematics of Biostructures and Biodynamics -- Copyright Page -- Contents -- Chapter 1. Introduction -- References -- Chapter 2. Counting, Algebra and Periodicity - the Roots of Mathematics are the Roots of Life -- 2.1 Counting and Sine -- 2.2 Three Dimensions -- Planes and Surfaces, and Surface Growth -- 2.3 The Growth of Nodal Surfaces - Molecules and Cubosomes -- References 2 -- Chapter 3. Nodal Surfaces of Tetragonal and Hexagonal Symmetry, and Rods -- 3.1 Non Cubic Surfaces -- 3.2 Tetragonal Nodal Surfaces and their Rod Structures -- 3.3 Hexagonal Nodal Surfaces and their Rod Structures -- References 3 -- Chapter 4. Nodal Surfaces, Planes, Rods and Transformations -- 4.1 Cubic Nodal Surfaces -- 4.2 Nodal Surfaces and Planes -- 4.3 Cubic Nodal Surfaces and Parallel Rods -- 4.4 Transformations of Nodal Surfaces -- References 4 -- Chapter 5. Motion in Biology -- 5.1 Background and Essential Functions -- 5.2 The Control of Shape - the Natural Exponential or cosh in 3D -- 5.3 The Gauss Distribution (GD) Function and Simple Motion -- 5.4 More Motion in 3D -- References 5 -- Chapter 6. Periodicity in Biology - Periodic Motion -- 6.1 The Hermite Function -- 6.2 Flagella- Snake and Screw Motion -- 6.3 Periodic Motion with Particles in 2D or 3D -- 6.4 Periodic Motion with Rotation of Particles in 2D -- References 6 -- Chapter 7. Finite Periodicity and the Cubosomes -- 7.1 Periodicity and the Hermite Function -- 7.2 Cubosomes and the Circular Functions -- 7.3 Cubosomes and the GD-Function - Finite Periodicity and Symmetry P -- 7.4 Cubosomes and the GD-Function - Symmetry G -- 7.5 Cubosomes and the GD Function - Symmetry D -- 7.6 Cubosomes and the Handmade Function -- References 7 -- Chapter 8. Cubic Cell Membrane Systems/Cell Organelles and Periodically Curved Single Membranes -- 8.0 Introduction -- 8.1 Cubic Membranes. , 8.2 The Endoplasmatic Reticulum -- 8.3 Protein Crystallisation in Cubic Lipid Bilayer Phases and Cubosomes - Colloidal Dispersions of Cubic Phases -- 8.4 From a Minimal Surface Description to a Standing Wave Dynamic Model of Cubic Membranes -- 8.5 Periodical Curvature in Single Membranes -- References 8 -- Chapter 9. Cells and their Division - Motion in Muscles and in DNA -- 9.1 The Roots and Simple Cell Division -- 9.2 Cell Division with Double Membranes -- 9.3 Motion in Muscle Cells -- 9.4 RNA and DNA Modelling -- References 9 -- Chapter 10. Concentration Gradients, Filaments, Motor Proteins and again- Flagella -- 10.1 Background and Essential Functions -- 10.2 Filaments -- 10.3 Microtubulus and Axonemes -- 10.4 Motor Proteins and the Power Stroke -- 10.5 Algebraic Roots Give Curvature to Flagella -- References 10 -- Chapter 11. Transportation -- 11.1 Background - Examples of Docking and Budding with Single Plane Layers, and Other Simple Examples -- 11.2 Docking and Budding with Curved Single Layers -- 11.3 Transport Through Double Layers -- References 11 -- Chapter 12. Icosahedral Symmetry, Clathrin Structures, Spikes, Axons, the Tree, and Solitary Waves -- 12.1 The icosahedral symmetry -- 12.2 Hyperbolic Polyhedra, Long Cones, Cylinders and Catenoids -- 12.3 Cylinder Division and Cylinder Fusion - Cylinder Growth -- 12.4 Solitary Waves, Solitons and Finite Periodicity -- References 12 -- Chapter 13. Axon Membranes and Synapses - A Role of Lipid Bilayer Structure in Nerve Signals -- 13.1 The Nerve Impulse -- 13.2 At the Action Potential Region of the Membrane there is a Phase Transition in the Lipid Bilayer -- 13.3 A Model of a Phase-Transition/Electric Signal Coupling at Depolarisation and its Physiological Significance -- 13.4 Transmission of the Nerve Signal at the Terminal Membrane of the Neurons - Synaptic Transmission. , 13.5 Synchronisation of Muscle Cell Activation -- 13.6 The General Anaesthetic Effect -- 13.7 Physiological Significance of Involvement of a Lipid Bilayer Phase Transition in Nerve Signal Conduction -- References 13 -- Chapter 14. The Lung Surface Structure and Respiration -- 14.1 The Alveolar Surface -- 14.2 Lung Surfactant -- 14.3 Structure of Tubular Myelin - A Bilayer arranged as the Classical CLP-Surface -- 14.4 The Existence of a Coherent Surface Phase Lining the Alveoli -- 14.5 Respiration -- 14.6 Physiological Significance of the Existence of an Organised Surface Phase at the Alveolar Surface -- References 14 -- Chapter 15. Epilogue -- Acknowledgement -- References 15 -- Appendix 1. The Plane, the Cylinder and the Sphere -- Appendix 2. Periodicity -- Appendix 3. The Exponential Scale, the GD function, Cylinder and Sphere Fusion -- Appendix 4. The Exponential Scale, the Planes and the Natural Function, Addition and Subtraction 409 -- Appendix 5. Multiplication of Planes, Saddles and Spirals -- Appendix 6. Symmetry -- Appendix 7. The Complex Exponential, the Natural Exponential and the GD- Exponential - General Examples and Finite Periodicity -- Appendix 8. Classical Differential Geometry and the Exponential Scale -- Appendix 9. Mathematica (Contains the Mathematica scripts used for calculating the equations for the figures in this book.) -- Subject Index.
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  • 2
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2734-2740 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption spectrum of ArN+ has been studied in the visible wavelength region by means of photofragment kinetic energy spectroscopy. The mass selected ions were accelerated to 25 keV and the ion beam was merged or crossed with a laser beam. The photoproducts Ar+/N and, weakly, Ar/N+ were observed as ArN+ was photodissociated with photons in the range 1.8–2.5 eV. This is the first observation of electronic transitions in ArN+. In order to interpret the results, potential energy curves of ArN+ were calculated with complete active space self-consistent field and multireference configuration interaction methods. The observed spectra are assigned to the A 3Π←X 3Σ−, C 3Σ−←X 3Σ− and C 3Σ−←A 3Π transitions. From these assignments a value of 2.16 eV for the dissociation energy of ArN+ is inferred.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1750-1756 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A photopredissociation spectrum of the A 1Πu–X 1Σ+g (8,2) transition in N2+2 is reported. The spectrum was recorded by detecting the photofragment signal as a function of excitation wavelength in a merged laser-ion beam apparatus. Line positions for the (8,2) band were measured and reduced to molecular constants. The natural linewidths, and hence predissociation rates, of all observed v'=8 levels were measured. The predissociation rates were found to be e/f symmetry dependent and, in particular, for the f levels, also J dependent. Somewhat surprisingly it appears as if tunneling does not contribute to the observed predissociation; rather, the v'=8 level of the A 1Πu state is depleted by coupling to the continua of the 1Σ−u, 3Σ+u, and 3Δu states.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4884-4895 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A study of the NO2+ ion by means of Auger spectroscopy, fast ion beam laser spectroscopy and ab initio calculations is reported. The photon induced Auger spectrum of NO was recorded. Potential curves for a number of electronic states of NO2+ were calculated by the complete active space SCF method in order to facilitate an analysis of the Auger spectrum. A photoabsorption spectrum of NO2+ was observed by means of photofragment kinetic energy spectroscopy and assigned to the A 2Π←X 2Σ+ transition. The two different experimental methods both give a value of 38.6 eV for the appearance energy of NO2+, which is entirely consistent with recent photoionization and double charge transfer results.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1365-2214
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Aim  To evaluate the instrument Measure of Processes of Care (MPOC) in a Swedish context.Methods  The MPOC consists of 56 questions in the five scales: enabling and partnership; providing general information; providing specific information about the child; co-ordinated and comprehensive care; and respectful and supportive care. The questionnaire was translated into Swedish and distributed to 850 families, served by four habilitation centres. After two reminders, a response rate of 74.9% was obtained, and about 60% of the questionnaires qualified for further statistical analysis. Reliability, calculated as Cronbach's alpha, was high for four of the five scales and acceptable for the fifth (scale no. 3).Results  Significant differences were shown between centres as well as between age groups. These differences were reasonable as judged through background knowledge, indicating that the instrument was able to discriminate between actual differences in services. Commenting on the practical use of the questionaire, staff, as well as responding parents, found the questionnaire rather long and some parents reported difficulties in giving answers as specific as the questionnaire asked them to.Conclusion  The MPOC shows sufficient sensitivity to be used as an evaluation tool for services at a centre or program level, and can be recommended for research and practical use.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Child 26 (2000), S. 0 
    ISSN: 1365-2214
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: This study is part of a project focusing on co-operation between receivers of habilitation services (families) and professionals. The study focuses on the organisation and co-ordination of the services, and compares two structures for their accomplishment. The first is the typical multiprofessional habilitation team (MHT), and the second is the individualised team (ISP). MHT teams are organised within the habilitation agency, while ISP teams span institutional boundaries. An ISP team is formed around the individual child who receives services from the habilitation centre, and includes parents (sometimes the child), professionals from the habilitation centre, and professionals from other service-providing institutions that are actively involved (for instance pre-school teacher, schoolteacher etc.). The team maps child and family needs, organises assessments and services and formulates goals that subsequently are monitored and followed up. A questionnaire (Measures of Processes of Care) was used to assess the experiences of 385 service receivers. The questionnaire focuses on service receivers' experiences of the family-centredness of the service, operationalised in 56 items, along with five items concerning perceptions of level of control over service provision. The experiences of families having individualised teams were compared to those not having these teams. Significant differences were obtained, suggesting the impact of the form of service organisation on the content. Families having ISP teams report both more family-centred service, and a greater level of control over service provision. Results are discussed in terms of organising structures and co-ordination of services, and in terms of family participation.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1772-1774 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: High quality, strained Si/Si1−xGex layered structures have been grown at temperatures in the range 400–625 °C, using a solid-source molecular-beam epitaxy (MBE) system with a mass-spectrometry-based loop-control to improve the accuracy and stability of the evaporation rates. Good control of the growth parameters has been achieved as verified by, e.g., high-resolution x-ray diffraction. Very high intensities and extremely small peak widths, down to 2.7 meV for the XNP transition at low excitation levels of photoluminescence spectra, indicate high crystalline quality of the layers. It is shown that some previously reported defect-related luminescence from MBE-grown SiGe layers is not intrinsic to the MBE process. © 1994 American Institue of Physics.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 7501-7507 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The fluorescence lifetime of the v'=0 level of the N2+2 D 1 ∑+u electronic state has been measured, with the high frequency deflection technique, for the first time. The result, τ=6.0±0.5 ns, is in good agreement with a recent photoion–photon of fluorescence coincidence measurement which yields a lifetime, averaged over an unspecified number of vibrational levels, of 8±3 ns. The electronic transition moment function for the N2+2 D 1 ∑+u–X 1 ∑+g transition was calculated with nonorthogonal complete active space SCF wave functions. Potential energy curves for the X 1 ∑+g and D 1 ∑+u states were calculated with a multireference contracted CI treatment and these potential curves were used, together with the electronic transition moment function, to obtain vibrationally averaged transition moments and hence a theoretical radiative lifetime. The calculated lifetime, 8.0 ns, is in good agreement with the experimentally determined value indicating that the decay of D 1 ∑+u, v'=0 occurs primarily via fluorescence to the X 1 ∑+g state.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5018-5026 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The complete active space SCF (CASSCF) method has been used to calculate the SiH A 2Δ–X 2Π electronic transition moment curve. The radiative lifetime deduced for v'=0 on basis of this transition moment curve and averaged over a number of rotational levels was 508 ns, which is in very good agreement with experimental results. The contracted CI (CCI) method was used to obtain the electronic potential functions of the A 2Δ and X 2Π states and the ground state electric dipole moment function. The dipole moment calculated at the equilibrium geometry (re=1.520 A(ring)), μe=0.123 D, is in excellent agreement with previous theoretical results. The ground state dissociation energies of SiH and CH were calculated with comparable basis sets in order to resolve a discrepancy regarding the SiH dissociation energy which prevails in the literature. The calculated dissociation energy D0(SiH)=3.00 supports the value obtained from observation of a predissociation in the B 2∑+ state of SiH, D0≤3.06 eV. Very recently this upper bound to the SiH dissociation energy also found support from a photoelectron spectroscopy experiment. The previously observed predissociation in the A 2Δ state, which suggested a 10% higher dissociation energy, is discussed in some detail and it is shown that the prior interpretation of this predissociation as an interaction between the A state and the ground state continuum is reasonable, but only yields an upper limit to the dissociation energy.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9405-9409 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Lifetimes have been measured for a large number of rotational levels of the A 2Δ and B 2Σ− states in CD using the high frequency deflection technique. Four B-state levels are found to be influenced by predissociation by rotation which demands a lower value of the CD dissociation energy. The B state predissociations have also been studied using ab initio calculations. The A state levels above the dissociation limit are found to be weakly predissociated through interaction with the ground state continuum. The results are compared with earlier lifetime investigations of CH.
    Materialart: Digitale Medien
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