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  • 1
    Electronic Resource
    Electronic Resource
    Potential-energy surfaces for Pt2+H and Pt+H interactions (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 541-550 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Potential-energy surfaces for ten electronic states of Pt2H as a function of Pt2–H distance are constructed using the complete active space multiconfiguration self-consistent field followed by multireference singles plus doubles configuration interactions which included up to 407 000 configurations. In addition, the spin-orbit effects were included through the relativistic configuration-interaction method. The potential-energy curves of low-lying electronic states of PtH and spectroscopic constants of 11 states of PtH are also computed using the same method. The experimental A'–X2 spectroscopic bands of PtH are reassigned to the 2Σ+(II)–1/2(I) transition. A tentative reassignment of the observed B'–X1 system is also suggested. The ground state of Pt2H is found to be of E(I) symmetry when spin-orbit effects are incorporated with a bridged structure [Re(Pt–Pt)=2.46 A(ring), Re(Pt–H)=1.684 A(ring)]. A very low-lying excited state E(II) (Te=0.14 eV) was found for Pt2H. The De(Pt2H)=59 kcal/mol compared to the De(PtH)=72 kcal/mol, indicating lower stability of the Pt2H bridge compared to PtH diatomic. Some of the low-lying electronic states of PtH, especially 3/2 states, exhibit avoided crossings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458457
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic states of Ga4 and In4 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6664-6669 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Complete active space–multiconfiguration self-consistent-field (CAS–MCSCF) followed by configuration interaction calculations, which included up to 250 000 configurations, are carried out on 16 electronic states of Ga4 and In4. Three nearly-degenerate electronic states of 3B3u, 3Au, and 1Ag symmetries with rhombus, square, and square geometries, respectively, are found as candidates for the ground states of Ga4 and In4. The tetramers of Ga and In are bound by 1.2 and 1 eV, respectively, compared to the trimers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460294
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  • 3
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy and electronic structure of clusters of the group V elements. I. Dimers (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6310-6317 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The HeI (584 A(ring)) high resolution photoelectron spectra of As+2, Sb+2, and Bi+2 have been obtained with a high temperature molecular beam source. A pure As2 beam was produced by evaporating Cu3As. Sb2 was generated as a mixture with the atoms and tetramers by evaporating the pure element, while Bi2 was generated as a mixture with only the atoms from the pure element. Vibrational structure was well resolved for the As+2 spectrum. Spectroscopic constants were derived and reported for the related ionic states. In addition, we have carried out relativistic complete active space self-consistent field followed by multireference single + double configuration interaction calculations on these dimers both for the neutral ground states and the related ionic states. The agreements between the calculated and experimentally derived spectroscopic constants were fairly good, although the calculations tended to underestimate consistently the strength of the bonding in these heavy homonuclear diatomics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459000
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic states and potential energy surfaces of PdH2: Comparison with PtH2 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6955-6961 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Complete active space MCSCF (CASSCF) followed by multireference singles and doubles configuration interaction (MRSDCI) calculations are carried out on 13 electronic states of PdH2 and 9 electronic states of PdH+ . The bending potential energy surfaces of 1A1 and 3A1 electronic states were obtained. The 1A1 surface contains two bent minima (θe =30° and θe =62°) and a higher linear minimum separated by a saddle point. The 3A1 surface is relatively flat in the region of the saddle point. The Pd(1S0 ) atom forms a weak complex with H2 but inserts spontaneously into H2 while the Pd(3D3 ) atom has to surmount a large barrier for insertion into H2. The spin–orbit effects for the electronic states of PdH2 are estimated through relativistic configuration interaction calculations of PdH+ whose d Mulliken population is close to that of the d population of PdH2. The ground state of PdH2 is found to be a weakly bound bent 1A1 state with θe =30° and re (Pd–H)=1.67 A(ring). The electronic state and potential energy surfaces of PdH2 are compared with PtH2. The Pt–H bond is found to be stronger than the Pd–H bond mainly due to relativistic effects. The Pd–H bonds are more ionic than the Pt–H bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454392
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  • 5
    Electronic Resource
    Electronic Resource
    Relativistic calculations of electronic states of PdH (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3981-3985 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Complete active space MCSCF(CASSCF)/first-order configuration interaction (FOCI) calculations followed by relativistic configuration interaction (RCI) calculations are carried out on 2Σ+, 2Π, 2Δ, and 2Σ+(II) λ–s states and 1/2, 3/2, 1/2(II), 3/2(II), and 5/2 ω–ω states of PdH. Our calculations predict that the ground state is 2Σ+1/2. The spin–orbit splitting and contamination of the excited states (2Π and 2Δ) are quite large. The two 3/2 states are quite mixed [3/2(I): 66% 2Δ3/2, 29% 2Π3/2] in character. The spectroscopic properties (Re, Te, De, and ωe) of all the above states are calculated and compared with available experimental results on the ground state of PdD. The Mulliken population analysis of the low-lying states of PdH shows that the 2Σ+ state is ionic (Pd+H−) but the excited 2Π and 2Δ states are a bit more ionic with the same polarity as the ground state. The 3/2 state exhibits an interesting avoided crossing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452952
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Hypoglycin A on the Alpha Cells of the Pancreas (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 855-856 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to re-examine the possibility, the following study was carried out. Albino rats and guinea pigs were injected intraperitoneally with a single lethal dose (150-300 mgm./kgm.) of hypoglycin A. When, death was obviously imminent the animal was killed and the pancreas was excised for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/180855a0
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  • 7
    Electronic Resource
    Electronic Resource
    Hypoglycin A,B : Biologically Active Polypeptides from Blighia sapida (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 356-357 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have found that the seed of the fruit contains two toxic polypeptides which we have named hypoglycin A and hypoglycin B. The ripe arillus, which is the common article of diet, contains a small concentration of hypoglycin A only. The unripe arillus contains a higher concentration of this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173356b0
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  • 8
    Electronic Resource
    Electronic Resource
    High Concentration of (−)-Noradrenaline in Portulaca oleracea L. (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1108-1108 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A crude protein-free extract was prepared as follows: the fresh plant was macerated in cold 2 N hydrochloric acid with a Waring blender. Protein was precipitated by adding ethanol (to approximately 75 per cent) and the supernatant was evaporated at low temperature, under reduced pressure, and in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911108a0
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  • 9
    Electronic Resource
    Electronic Resource
    Transforming growth factor-beta regulates the expression of luteinizing hormone receptors in ovarian granulosa cells
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 139 (1986), S. 800-807 
    Details
    ISSN: 0006-291X
    Keywords: [abr] BSA; bovine ser' albumin ; [abr] EGF; epidermal growth factor ; [abr] FSH; follicle-stimulating hormone ; [abr] LH; luteinizing hormone ; [abr] PBS; phosphate-buffered saline ; [abr] PDGF; plateletderived growth factor ; [abr] TGF-β; transforming growth factor-β ; [abr] hCG; human chorionic gonadotropin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0006-291X(86)80061-4
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  • 10
    Electronic Resource
    Electronic Resource
    Ligand T"3 Dependent and Independent Effects of Thyroid Hormone Receptors upon Human TRH Gene Transcription in Neuroblastoma Cells
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 200 (1994), S. 171-177 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/bbrc.1994.1430
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