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  • 1
    Digitale Medien
    Digitale Medien
    Molecular integrals with Slater basis. IV. Ellipsoidal coordinate methods for three-center nuclear attraction integrals (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7613-7622 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We develop and check an updated version of the ellipsoidal coordinate methods for the calculation of three-center nuclear attraction integrals with Slater-type orbitals (STOs). A first set of recurrence relations allows us to express these integrals in terms of some basic potentials. The basic potentials are classified in short- and long-range types, and then calculated in specific ways from auxiliary functions obtained by using a new set of both stable and fast recurrence relations. Numerical tests show that the procedure enables to reach very high accuracy in the integrals with a low computational cost.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463481
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  • 2
    Digitale Medien
    Digitale Medien
    Molecular integrals with Slater basis. II. Fast computational algorithms (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4213-4222 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A new algorithm for the calculation of molecular integrals involving STOs is reported. The algorithm enables us to obtain every two-center one-electron integral and the long-range many-center one- and two-electron integrals. The efficient implementation of the algorithm is discussed and its performance is thoroughly tested. The analysis on the stability of the relations employed in the calculation of multipolar moments is included. Futhermore, the computer time required to carry out each step (construction of basic matrices, calculation of multipolar moments, and calculation of two-electron integrals) has also been analyzed. The range of validity of this approach is shown in several molecular integrals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456800
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  • 3
    Digitale Medien
    Digitale Medien
    Molecular integrals with Slater basis. III. Three-center nuclear attraction integrals (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 5032-5039 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We discuss the calculation of the general three-center nuclear attraction integrals with Slater type orbitals using a one-center expansion method which exploits the algorithms previously developed by us for long-range integrals. From the analysis of the numerical stability, accuracy, and computational cost we conclude that the reported procedure is suitable for the calculation of these integrals with any desired precision. Moreover, we have found that most of these integrals can be obtained with high accuracy at a very low computational cost, but the procedure could be too expensive for a few of them.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460538
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  • 4
    Digitale Medien
    Digitale Medien
    Molecular integrals with Slater basis. I. General approach (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4204-4212 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A method for the calculation of many-center integrals involving Slater-type orbitals (STOs) is reported. The method is based on the separation of the short- and long-range terms of the potentials generated by charge distributions. The calculation of three-center nuclear attraction integrals and many-center electron repulsion integrals, when the short-range contributions are negligible, is formulated in terms of multipolar moments of charge distributions. Recurrence relations for obtaining the multipolar moments, which enable us to reduce their calculations to the evaluation of some basic integrals, are reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456799
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  • 5
    Digitale Medien
    Digitale Medien
    EFFECTS OF ENVIRONMENTAL COMPLEXITY ON AMINO ACID INCORPORATION INTO RAT CORTEX AND HIPPOCAMPUS IN VIVO (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 19 (1972), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract— Amino acid incorporation in vivo was investigated in the cortex and hippocampus of rats raised in enriched and deprived environments for various periods of time following weaning. At early times after weaning (7 days), the incorporation of l-[3H]leucine into all sub-cellular fractions of both cortex and hippocampus was higher in enriched than in deprived rats. At 16 days, incorporation into synaptosomal sub-cellular fractions was higher in enriched than in deprived hippocampus, and lower in enriched than in deprived cortex; incorporation into perikaryal fractions of both brain regions was the same in the two groups of animals. Incorporation into subcortical nuclear protein fractions was higher in enriched rats at this time. At 35 days, the only difference between enriched and deprived rats was a lower incorporation into cortical synaptosomal sub-fractions in the former. Experiments involving double labelling and electrophoresis indicate that there is no stimulation or inhibition of the synthesis of any particular protein in hippocampal nuclear and synaptosomal sub-fractions of enriched rats. Synaptosomal proteins of cortex have a greater half-life in enriched than in deprived rats; proteins of perikaryal fractions of cortex, and of all fractions of hippocampus, are turning over at the same rate in enriched and deprived animals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-4159.1972.tb01321.x
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of rf sidebands on spectral reproducibility for infrared synchrotron radiation : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1856-1858 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The effects of audio sidebands from the main rf of the NSLS VUV storage ring on beam motion and specifically on spectral reproducibility in the infrared region were investigated. For this spectral region it is advantageous to use Michelson interferometers because of their high throughput (Jacquinot advantage). A second advantage is that interferometers inherently give a multiplex or Felgett advantage, since one is always looking at all the wavelengths for all of the measuring time, even though there is only one detector. In such instruments it is beneficial to scan the moving mirror at a fast rate so that any mechanical or other low-frequency noise shows up as a slow modulation in the interferogram and disappears altogether in the Fourier transform from the spectral region of interest. However, audio-frequency sidebands appear from the rf energy restoring cavity as noise on the beam. These always occur at multiples of 60 Hz and can thus be readily identified. They can also be confirmed by changing the mirror velocity which changes where they appear in the spectra in a predictable way. In the present work, spectra were measured while simultaneously reducing and shifting the sidebands in the rf and thus the effects were correlated and ultimately eliminated as a source of noise. Ultimately reproducibilities of 〈1% in 15 s of scanning time across the entire spectral region from 800 to 4000 cm−1 with a sample throughput of only 10−10 m2 sr were achieved. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145805
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  • 7
    Digitale Medien
    Digitale Medien
    Molecular integrals with Slater basis. V. Recurrence algorithm for the exchange integrals (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9807-9816 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The numerical and analytical procedures, used for calculating exchange integrals with Slater functions, fail to give high accuracy for large quantum numbers and some values of the parameters. We propose here an algorithmic approach based on recurrence relations which start from some simple functions. An extensive study in which exponents, interatomic distances, and quantum numbers were varied proves that the new procedure is fully reliable. Finally, the cost of the procedure is analyzed, including the effect of the number of terms needed to attain a given accuracy. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.467946
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  • 8
    Digitale Medien
    Digitale Medien
    Estudio Histoquímico y Morfométrico de la Población Fibrilar del Müsculo Diafragma. Parte II: Vaca y Cerdo (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 24 (1995), S. 0 
    Details
    ISSN: 1439-0264
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Histochemical and Morphometric Study of the Fibrilar Population in Diaphragm Muscle. Part II: Ox and PigM-ATPase techniques, at different pH levels prior to incubation, as well as metabolic procedures (α-MGPDH and NADH-TR), were used to determine the fibre-type content of the lumbar and costal portions in the bovine and porcine diaphragm. The fibre samples were exposed to image analysis in order to evaluate both the morphometrical and statistical values.On the basis of tintorial reactions, the fibre types IA, IB and IIC were found in the lumbar portion of the bovine diaphragm; in the costal portion of the same diaphragm, IA, IB, IIA and IIC fibre types were observed. With regard to the porcine diaphragm, the I, IIA, IIB, IIC fibre types were present in both portions of the muscle. Further morphometrical and statistical data concerning all the fibre types are obtained and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0264.1995.tb00048.x
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  • 9
    Digitale Medien
    Digitale Medien
    Normal Anatomical Imaging of the Thorax in Three Dogs: Computed Tomography and Macroscopic Cross Sections with Vascular Injection (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 34 (2005), S. 0 
    Details
    ISSN: 1439-0264
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The purpose of this study was to provide a new reference for interpretation of the normal anatomy of the canine thorax as imaged using computed tomography (CT). Three mature dogs, all mixed breed males, were used for this study. The dogs were sedated, anaesthetized and maintained in sternal recumbency. CT study from the first to the thirteen thoracic vertebra was performed with a TOSHIBA 600HQ scanner (third generation equipment). Dogs were killed and vascular-injection technique was performed: red latex and blue latex filled vascular system. Injected dogs were frozen and sectioned with an electric bandsaw, the cuts matched as closely as possible to the CT images. The CT images from this study are intended as a reference for clinical CT imaging studies of the thoracic cavity of the dog and for interpreting lesions of the thorax and associated structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0264.2005.00596.x
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  • 10
    Digitale Medien
    Digitale Medien
    Anatomy of the Cranioencephalic Structures of the Camel (Camelus dromedarius L.) by Imaging Techniques: A Magnetic Resonance Imaging Study (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 34 (2005), S. 0 
    Details
    ISSN: 1439-0264
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The objective of this study was to define the anatomy of the cranioencephalic structures and associated formations in camel using magnetic resonance imaging (MRI). MR images were acquired in sagittal, transverse and oblique dorsal planes, using spin-echo techniques, a magnet of 1.5 T and a standard human body coil. MR images were compared with corresponding frozen cross-sections of the head. Different anatomic structures were identified and labelled at each level. The resulting images provided excellent soft tissue contrast and anatomic detail of the brain and associated structures of the camel head. Annotated MR images from this study are intended to be a reference for clinical imaging studies of the head of the dromedary camel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1439-0264.2004.00572.x
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