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  • 1965-1969  (214)
  • 1850-1859
  • Cell & Developmental Biology  (188)
  • Computational Chemistry and Molecular Modeling  (26)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 1 (1967), S. 421-425 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On a calculé, pour un déterminant de Slater projeté sur un sous-espace de spin défini, les fonctions de densité pour deux électrons, définies par McWeeny.
    Abstract: Die Zweielektronenfunktionen von McWeeny, sind für eine Spin-projizierte Slaterdeterminante berechnet worden.
    Notes: The two-particle density functions introduced by McWeeny are calculated for a spin-projected Slater determinant.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 13-15 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 1 (1967), S. 675-692 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Les matrices de densité du premier et du second ordre D(N) et D2(N) pour la fonction g(n) = AN[g(1, 2) … g(N - 1, N)] sont emprimées par la fonction même g(1, 2) et par sa matrice de densité D. Dans l'état singulet les fonctions génératices pour les parties spatiales sont simplement liées à la résolvante de l'équation de Fredholm dans laquelle la partie spatiale D sert de noyau. Quelques cas particuliers de g(1, 2) sont considérés. On établit que le nombre de grandes valeurs propres D2(N) ne dépasse pas le nombre de valeurs propres différentes de D. Ainsi c'est la perturbation dans le spectre D qui produit ces grandes valeurs propres.
    Abstract: Die Dichtematrizen der ersten und zweiten Ordnung D(N) und D2(N) für die Funktion g(n) = AN[g(1, 2) … g(N - 1, N)] werden durch die Funktion g allein und ihre Dichtematgrix erster Ordnung D ausgedrückt. Im Singletzustand hangen die erzeugenden Funktionen für die räumlichen Teile dieser Matrizen mit dem Resolventum von Fredholms Gleichung, mit dem räumlichen Teil von D als Kern zusammen. Hier werden einige spezielle Fälle für g(1, 2) betrachtet. Es wurde festgestellt, dass die Zahl der grossen Eigenwerete D2(N) Die Zahl der verschiedenen Eigenwerte von D nicht übersteigt. Somit hat die Degeneration im Spektrum D das Auftreten von solchen grossen Eigenwerten zur Folge.
    Notes: The first- and second-order density matrices D(N) and D2(N) for the function g(n) = AN[g(1, 2) … g(N - 1, N)] are expressed by the g function itself and its density matrix D. In a singlet state the generating functions for spatial parts of these matrices are simply connected with there solvent of the Fredholm equation in which the spatial part of D is a kernel. Some special cases of g(1, 2) are considered. It isestablished that the number of large eigenvalues of D2(N) does not exceed that of different eigenvalues of D. Thus the degeneracy in the spectrum of D causes the appearance of such large eigenvalues.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 1013-1025 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: All-electron SCF-LCAO-MO computations for diazomethane, ketene and allene are presented. The basis functions are contracted Gaussian orbitals. Theoretical results are discussed and related to available experimental data.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 169-184 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We discuss the properties of one version of the least squares (LS) method for the solution of the Schrödinger equation. These properties are exemplified by a number of calculations on the n1S and n3S states of helium, up to principal quantum number three, which are very much more accurate than previous LS calculations on helium. Particular attention is paid to the convergence properties of the LS procedure and we compare it with the simpler Rayleigh-Ritz (RR) procedure in the case when the RR matrix elements are evaluated numerically over the same quadrature mesh as used in the LS procedure. We conclude that although the LS procedure is capable of high accuracy it has no advantages which would justify its sole use in place of the RR procedure. However, it does have some advantages when used in conjunction with RR, in that it gives an estimate of the numerical accuracy of the RR energies.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 124 (1968), S. 387-421 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Electron microscope autoradiography was used to study cartilage from regenerating limbs of adult newts, Triturus, after intraperitoneal injections of proline-3H. The labeling in the endoplasmic reticulum, small vesicles, Golgi vacuoles, ground cytoplasm and extracellular matrix was compared during the secretion of radioactive products. The data appear to indicate that a large part of the radioactive secretion probably leaves the cell after having been in only one cellular compartment. Although this compartment may be the endoplasmic reticulum, a considerable amount of radioactivity fluxes through the ground cytoplasm and the possibility cannot be excluded that some secretory components leave the cell directly from the ground cytoplasm. The data appear incompatible with the hypothesis that all the radioactivity seen in the extracellular matrix arrived there via a single pathway involving first the endoplasmic reticulum and then the Golgi vacuoles. It is not, however, incompatible with a hypothesis that a fraction of the radioactive product uses this pathway.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Gross examination of the chimpanzee skull revealed that: there are three ethmoidal sinuses; the sphenoid sinus is immense and is divided into a superior and inferior part; the huge maxillary sinus contains a distinct bony canal for the nasolacrimal duct; the anterior and middle ethmoidal sinuses drain into the superior meatus; the frontal sinus drains via the middle ethmoid; the posterior ethmoid and sphenoid sinuses open into the sphenoethmoidal recess and also communicate with each other; the maxillary sinus opens into the middle meatus through a large ostium; the nasolacrimal duct drains into the inferior meatus; the mastoid process is small but contains a central cavity which communicates with the middle ear; the broad and smooth planum tympanum serves as the floor of the external auditory canal, the latter forming an angle of 30° with the horizontal; the tympanic membrane makes an angle of 30° with the floor of the canal and is deeply recessed antero-inferiorly; except for the extreme slope of the tympanic membrane and the malleus, the middle ear is similar to man; the inner ear is likewise similar; the carotid artery and the large carotid plexus lie in a definite osseous tube surrounded by pneumatized bone but attached to the periotic capsule; the chimpanzee is subject to otitis media.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The possibility of sympathetic innervation to melanophores in fish was investigated using a catecholamine histochemical fluorescence method. Catecholamine-containing fibers were observed to be in close anatomic proximity to the conjunctival and dermal melanophores of the cunner (Tautogolabrus adspersus). It is suggested that the catecholamines released from these adrenergic fibers are capable of causing aggregation of pigment with blanching of skin color.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A saturated solution of 20-methylcholanthrene in benzene was applied to the ear and trunk of 59 BALB mice. The effects upon cutaneous innervation were compared with that of 50% turpentine in acetone (13 mice) and of skin abrasion with sandpaper (11 mice). Silver impregnation techniques showed that the carcinogentreated epidermis was invaded by nerve fibers whose number was related to the degree of epidermal hyperplasia, but not to the period of treatment or to the animals' age at the time of first painting. Hair follicles showed changes in the size, number and length of nerve endings. Growth of cutaneous nerves was already evident on the fourth day of exposure to methylcholanthrene. Turpentine elicited only a slight neural reaction after 60 days; and the sandpaper treatment was without effect.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Longitudinal series of hand x-rays from healthy white children (116 boys, 118 girls) of Fels growth studies were investigated. Notchings of the nonepiphyseal end of the first, second and fifth metacarpal bones were found in every child. Beginning from infancy or early childhood, the notchings follow a sequence of developmental stages (obtuse-angle; acute-angle; cleft: underlying, edge-to-edge, overjutting; and fusion) until they disappear one to one and one-half years before onset of puberty. The notching intensity in the second and the fifth metacarpal bones was rated. A moderate degree of association in notching intensity was demonstrated between brothers and sisters.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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