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  • 1
    Electronic Resource
    Electronic Resource
    ESDIAD of first-row protic hydrides adsorbed on silicon(100): structure and reactivity (1988)
    s.l. : American Chemical Society
    Langmuir 4 (1988), S. 277-282 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00080a006
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  • 2
    Electronic Resource
    Electronic Resource
    An Ion Exchange Casting Resin (1959)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 51 (1959), S. 1045-1046 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie51396a044
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  • 3
    Electronic Resource
    Electronic Resource
    The high energy spherical grating monochromator−A new source of soft x rays at Daresbury (abstract) : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1341-1341 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article we report the characteristics of the new High Energy Spherical Grating Monochromator beam line on the SRS. The instrument, which has no entrance slit, was designed to provide high photon flux with small spot size, in the energy range covering the 1s binding energies of carbon, nitrogen, oxygen, and fluorine. Radiation from a bending magnet is horizontally focused onto the exit slit by a long, Pt-coated meridian cylinder (R=299 m, 2 mrad horiz. aperture, 2° glancing angle). The light is vertically diffracted and focused by one of three interchangeable spherical gratings (1050, 1500, and 1800 lines mm−1) operating in negative order. Finally, the light is refocused by an ellipsoidal mirror. The photon flux, determined with copper and carbon photocathodes, is presented for the three gratings. Useful flux is obtained in the range 250–1200 eV, with intensity maxima for each grating at 600, 700, and 800 eV of 11, 9, and 5×1010 photons s−1 per 100-mA stored beam into a band pass of 0.05%. The influence of contaminants which are present on the optical elements is discussed, together with details of beam line operating conditions which minimize the build up of such contaminants. Photoabsorption and photoemission measurements indicate a high (up to 30%) second order and some third order light content. Resolution determinations obtained from photoabsorption measurements are presented. Although features as narrow as 250 meV have been resolved, the resolving power of the instrument is found to depend strongly on stored beam current. We suggest this may be due to electron beam (i.e., source) blow-up. We critically discuss the suitability of the new facility for surface EXAFS of low Z adsorbates, in particular above the carbon, nitrogen, and oxygen 1s edges, using examples from recent studies which have been undertaken on the beamline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143064
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  • 4
    Electronic Resource
    Electronic Resource
    Resonances in the K shell excitation spectra of benzene and pyridine: Gas phase, solid, and chemisorbed states (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 6099-6107 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: K shell excitation spectra of the aromatic molecules benzene and pyridine in the gas phase are compared to those for the solids (ices) and for monolayers chemisorbed on Pt(111). The gas phase and solid spectra are essentially identical and even the spectra for the chemisorbed molecules exhibit the same resonances. Because of the orientation of the molecules upon chemisorption the latter spectra show a strong polarization dependence as a function of x-ray incidence. This polarization dependence in conjunction with a multiple scattering Xα calculation for the benzene molecule allows us to assign the origin of all K shell resonances. The resonances are found to arise from transitions to π* antibonding orbitals and to σ* shape resonances in the continuum. The shape resonances are characterized by potential barriers in high (l=5 and 6) angular momentum states of the excited photoelectron. The polarization dependence and energy position of the resonances allow the molecular orientation on the surface to be determined and show that the change in the carbon–carbon bond length is less than 0.02 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449601
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon K-shell excitation of gaseous and condensed cyclic hydrocarbons: C3H6, C4H8, C5H8, C5H10, C6H10, C6H12, and C8H8 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 4849-4862 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The carbon K-shell excitation spectra of gaseous cyclic hydrocarbons, both saturated (cyclopropane, cyclobutane, cyclopentane, cyclohexane) and unsaturated (cyclopentene, cyclohexene, and cyclooctatetraene), have been recorded by electron energy loss spectroscopy under dipole-dominated conditions. These are compared to the NEXAFS spectra of multilayers and monolayers of C4H8, C5H8, C6H12, and C8H8 on Pt(111). Multiple scattering Xα calculations of the spectra of cyclopropane, cyclobutane, and cyclohexane are also reported. In most cases the gas and solid spectra are essentially the same indicating that intramolecular transitions dominate in the condensed phase. The NEXAFS polarization dependence of the condensed phases has assisted spectral assignments and the determination of the molecular orientation in the monolayer phase. In the saturated species a sharp feature about 3 eV below the carbon 1s ionization threshold is identified as a transition to a state of mixed Rydberg/valence character with the π*(CH2) valence component dominating. Except for cyclopropane the positions of the main σ * resonances correlate with the C–C bond lengths in a manner similar to that reported previously for noncyclic aliphatic molecules. In the spectra of monolayer C6H12, C5H8, and C8H8 spectral broadening and weak additional features are observed which are attributed to molecule–surface interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451719
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  • 6
    Electronic Resource
    Electronic Resource
    The Acylation of Triphenylamine in the Presence of Zinc Chloride or Aluminum Chloride (1964)
    s.l. : American Chemical Society
    The @journal of organic chemistry 29 (1964), S. 3536-3538 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01035a023
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  • 7
    Electronic Resource
    Electronic Resource
    Carbon-13 nuclear magnetic resonance studies. XXV. Carbon-13 nuclear magnetic resonance as a monitor for anionic exchange processes. Remote epimerization via homoenolate ions and aryl D exchange (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 8582-8584 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00779a051
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  • 8
    Electronic Resource
    Electronic Resource
    EFFECT OF UNDERNUTRITION ON CELL FORMATION IN THE RAT BRAIN (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 20 (1973), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Rats were undernourished by approximately halving the normal food given from the 6th day of gestation throughout lactation. Growth of the foetuses was nearly normal, in marked contrast to the severe retardation caused by undernutrition during the suckling period. In comparison with controls the size and the DNA content of the brain were permanently reduced by undernutrition during the suckling period: this effect was relatively small, approx. 15 per cent decrease at 21 and 35 days. The rate of 14C incorporation into brain DNA at 30 min after administration of [2-14C] thymidine was taken as an index of mitotic activity; compared with controls there was severe reduction in mitotic activity (maximal decrease by about 80 per cent at 6 days in the cerebrum and by 70 per cent at 10 days in the cerebellum). The rate of acquisition of cells was calculated from the slopes of the logistic curves fitted to the estimated DNA contents. In normal animals the maximal slope was attained at 2·7 days and at 12·8 days after birth in cerebrum and cerebellum respectively; the daily acquisition of cells at these times was 4·8 × 106 and 18 × 106 cells respectively. The fractional increase in cell number at the maximum was 5·4 percent per day in the cerebrum and 15·2 per cent per day in the cerebellum. The rate of acquisition of cells relative to the rate of mitotic activity was higher in the brains of undernourished animals than in controls. One of the compensatory mechanisms for the severe depression of mitotic activity in the brain of undernourished animals Seems to involve a reduction in the normal rate of cell loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1973.tb00085.x
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  • 9
    Electronic Resource
    Electronic Resource
    EFFECTS OF CORTICOSTEROIDS ON THE BIOCHEMICAL MATURATION OF RAT BRAIN: POSTNATAL CELL FORMATION (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 19 (1972), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: (1) Treatment with cortisol acetate (0.2 mg daily during the first 4 days after birth) reduced the rate of growth in the rat: at 35 days of age the body weight was reduced by 50 per cent and the brain weight, depending on the region, by up to 30 per cent.(2) In the brain the normal increase in cell number was severely inhibited during the period of cortisol treatment; this resulted in a final deficit in cell number of about 20 per cent in the cerebrum and 30 per cent in the cerebellum.(3) To determine whether cortisol affected primarily cell formation or cell destruction the labelling of brain DNA was studied 1 h after a subcutaneous injection of 20 Ci/100 g [2-14C]thymidine. In the controls the amount of labelled DNA increased by a factor of two in the cerebrum and seven in the cerebellum during the period 2-13 days, and it decreased to 40 and 27 per cent of the peak values in the cerebrum and cerebellum respectively in the following 7 days. The results indicated that mitotic activity is higher in the cerebellum than in the cerebrum in the 2nd week of life. It would appear that in the cerebrum appreciable cell death accompanies new cell formation, especially during the period 13-35 days of age.(4) Cortisol treatment affected cell division rather than cell destruction in the brain since it strongly inhibited the incorporation of [2-14C]thymidine into DNA. The inhibition was severe during the period of treatment but it did not result in a lasting fall in mitotic activity. At the age of 13 days the amount of labelled DNA formed approached the normal level and it was twice that in controls at 20 days, indicating a tendency for compensating cell deficit by an accelerated mitotic activity. Nevertheless, massive cell proliferation ceased at about the same age as in normals; the labelling of DNA decreased markedly between 13 and 20 days after birth, and the DNA content did not increase after the age of 20 days.(5) In contrast to the marked effect on cell number, cortisol treatment did not influence significantly the maturational changes related to average cell size (DNA concentration) or the chemical composition of cells (RNA/DNA and protein/DNA).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1972.tb05124.x
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  • 10
    Electronic Resource
    Electronic Resource
    EFFECT OF THYROID HORMONE ON THE BIOCHEMICAL MATURATION OF RAT BRAIN: CONVERSION OF GLUCOSE-CARBON INTO AMINO ACIDS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 17 (1970), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 〈list xml:id="l1" style="custom"〉1The rapid and extensive conversion of glucose-carbon into amino acids is an index of the final coordination of the mechanisms underlying energy metabolism in the adult brain. This phenomenon develops in the rat during a short period extending from 10 to about 19 days after birth. The underlying factors have been analysed.〈list xml:id="l2" style="custom"〉2The development of the pattern of distribution of glucose-carbon characteristic of the adult brain was markedly influenced by the thyroid state of the animals. The age-curve for the conversion of glucose-carbon into brain amino acids was displaced to the left after treatment with thyroid hormone (T3) in infancy thus indicating an accelerated maturation. Conversely, neonatal thyroidectomy resulted in a significant retardation in the conversion of glucose-carbon into amino acids.〈list xml:id="l3" style="custom"〉3The specific radioactivity of glutamate increased five-fold in the brain of normal rats from the 10th to the 19th day of age. The values (as a percentage of those for littermate controls) were 220 in the case of the 10 day-old thyroid treated rats and about 30 for the 19 day-old thyroid deficient animals. At the age of 10 days neither treatment affected the concentration of glutamate which was also only slightly less than the control values in the brain of 19 day-old thyroid deficient animals (–17 per cent).〈list xml:id="l4" style="custom"〉4Specific pool(s) of glutamate associated with the formation of GABA can be demonstrated in the brain of 19 day-old rats after administration of [U-14C]glucose as a result of anoxia post mortem. These pools did not develop in the brain of 10 day-old animals. Neonatal thyroidectomy retarded the development of these glutamate pools.〈list xml:id="l5" style="custom"〉5Evidence is summarized which indicates that the development of the rapid conversion of glucose-carbon into amino acids reflects the enlargement, during maturation, of the metabolic compartments which are associated with neuronal processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1970.tb03376.x
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