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  • 1
    Electronic Resource
    Electronic Resource
    Comment on "A theoretical study of the dissociation energy of BH using quadratic configuration interaction'' (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4425-4426 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociation energy of boron hydride has been calculated ab initio using a very accurate theoretical model, with an expected accuracy of ±0.2 kcal mol−1. The values of 85.7 and 82.4 kcal mol−1 for De and D0, respectively, confirm the conclusion of Curtiss and Pople [J. Chem. Phys. 90, 2522 (1989)], that the predissociation limit of 82.6±0.4 kcal mol−1 might be close to the actual dissociation energy, and that an earlier proposed De of 78.9 kcal mol−1 is in error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456778
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  • 2
    Electronic Resource
    Electronic Resource
    Note on the vibrational spectrum of C4 and C5 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3403-3405 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The geometry and infrared spectrum of C5 have been computed ab initio using the MP2/6-31G* theoretical model. The inner and outer bond lengths are 1.291 and 1.300 A(ring), respectively. A very intense (1243 km mol−1) ∑+u band is predicted at 2193 cm−1, while another ∑+u mode at 1368 cm−1 is found to be much less intense (64 km mol−1). The results confirm the assignment of the experimental infrared (IR) frequencies of C4 and C5 suggested by Bernholdt et al. [J. Chem. Phys. 89, 3612 (1988)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455846
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  • 3
    Electronic Resource
    Electronic Resource
    Ab initio study of boron, nitrogen, and boron–nitrogen clusters. I. Isomers and thermochemistry of B3, B2N, BN2, and N3 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6469-6485 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For a number of different structures and states of B3, B2N, BN2, and N3, optimum geometries and harmonic spectra were obtained at the HF/6-31G* level. The relative stability of the isomers was determined using full fourth-order Møller–Plesset theory, both with and without spin projection, as well as coupled cluster methods. Estimates for the dissociation energies are based on scaled CCD+ST(CCD) binding energies. Koopmans' vertical ionization potentials and Mulliken charge distributions, both at the UHF/6-31G* level, are quoted for the most stable isomers. B3 is found to be an equilateral triangle in its 2A'1 ground state. B2N has a symmetric linear arrangement in its 2Σ+u ground state with an extremely low bending frequency (73 cm−1), and an unusually low vertical ionization potential (6.75 eV). Its asymmetric stretching (2021 cm−1) is found to be extremely intense (8782 km mol−1). BN2 has four rather closely spaced states, of which an isosceles triangle is the absolute minimum (2A1 state). However, at high temperatures, an asymmetric linear arrangement (2Π state) is found to have equal importance, whereas a 4Σ− state plays a role there too. The same theoretical methods correctly predict for N3 a symmetric linear arrangement in the 2Πg ground state; the spectroscopic constants are found to be in reasonable agreement with experiment. Estimated dissociation energies (expected accuracy ±4 kcal mol−1) are: B3 197.9, B2N 265.0, BN2 224.9, N3 210.1 kcal mol−1. From a statistical thermodynamical analysis, B3 is stable against dissociation to B2 and B up to very high temperatures, B2N is extraordinarily stable, whereas BN2 and N3 dissociate spontaneously to B+N2 and N+N2 at all temperatures. From these results, the presence of B2N+ and B+3, the high abundance of B2N+, as well as the absence of BN+2 and N+3 in laser mass spectra of boron nitride is explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456313
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  • 4
    Electronic Resource
    Electronic Resource
    Arguments Against the Role of Receptor Reserve as a Determinant of the Sensitivity of α1-Adrenoceptor-Mediated Pressor Responses to Inhibition by Ca2+ Entry Blockers in the Pithed Rat (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 522 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb33378.x
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  • 5
    Electronic Resource
    Electronic Resource
    Clinicopathological and immunohistochemical analysis of 20 cases of Merkel cell carcinoma in search of prognostic markers (2005)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 46 (2005), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims:  To evaluate the clinicopathological and immunohistochemical characteristics of Merkel cell carcinoma (MCC) in an attempt to find new, potentially significant, prognostic markers.Methods and results:  Clinical data and follow-up, histopathological features (pattern, cell size, thickness, mitoses, vascular invasion, lymphocytic infiltration) and immunohistochemical detection [CK20, thyroid transcription factor (TTF-1), chromogranin A, synaptophysin, p53, Ki67, Fli-1, CD99, c-Kit] were evaluated in 20 cases of MCC. Fli-1 and CD99 were detected in 90% and 55% of cases, respectively. Tumour size 〉 30 mm, stage II, ‘absent’ lymphocytic infiltration, and the presence of 〉 50% of Ki67+ tumour cells, were found to be prognostic indicators of disease-free interval (DFI), but only ‘absent’ lymphocytic infiltration constituted an independent prognostic factor of DFI after multivariate analysis. For overall survival, the same variables, together with local recurrence and lymph node involvement, had prognostic significance, with only local recurrence as an independent prognostic factor after multivariate analysis.Conclusions:  Absence of lymphocytic infiltration and Ki67 immunoreactivity in more than 50% of tumour cells should be evaluated in conjunction with other well-known prognostic markers in MCC. Furthermore, recognizing that Fli-1 and CD99 expression is commonly found in MCC by immunohistochemistry may avoid misinterpretation in the differential diagnosis of MCC with other small round cell tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.2005.02158.x
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of directional selectivity in MT receptive field centre and surround (2005)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 22 (2005), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We studied receptive field organization of motion-sensitive neurons in macaque middle temporal cortical area (MT), by mapping direction selectivity in space and in time. Stimuli consisted of pseudorandom sequences of single motion steps presented simultaneously at many different receptive field locations. Spatio-temporal receptive field profiles were constructed by cross-correlating stimuli and spikes. The resulting spike-triggered averages revealed centre-surround organization. The temporal dynamics of the receptive fields were generally biphasic with increased probability for the preferred direction at short latency (50–70 ms) and decreased probability at longer latency (80–100 ms). The response latency of the receptive field surround was on average 16 ms longer than that of the centre. Our results show that surround input and biphasic behaviour reflect two different mechanisms, which make MT cells specifically sensitive to motion contrast in space and time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2005.04363.x
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  • 7
    Electronic Resource
    Electronic Resource
    Valerius Flaccus—Poet of Romance (1938)
    Cambridge : Cambridge University Press
    Greece and Rome 7 (1938), S. 137-148 
    Details
    ISSN: 0017-3835
    Source: Cambridge Journals Digital Archives
    Topics: Archaeology , Classical Studies
    Notes: The period of the Flavian emperors (A.D. 69–96) was distinguished by a notable revival of epic poetry. No fewer than three poets, whose work is extant, flourished contemporaneously—Statius, Valerius, and Silius. It was indeed an age of literary figures, including Martial, Pliny the Younger, Quin-tilian, and Tacitus. Statius and Valerius are interesting as epic poets in that they broke away from the tradition of national and patriotic poetry prescribed for their art from the time of Ennius. Silius, on the other hand, remained true to the convention of Latin epic, and, in an age when the stimulus of national pride was losing its effect on poetry, produced a long poem that lacked originality and inspiration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0017383500005568
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  • 8
    Electronic Resource
    Electronic Resource
    Persius—Poet of the Stoics (1939)
    Cambridge : Cambridge University Press
    Greece and Rome 8 (1939), S. 172-182 
    Details
    ISSN: 0017-3835
    Source: Cambridge Journals Digital Archives
    Topics: Archaeology , Classical Studies
    Notes: There can be little doubt that the extant remains of Persius form the whole of his writings. In his boyhood he had indulged in the literary exercises of the classroom, and these immature efforts included a tragedy, a book of travels, and some lines on the elder Arria, whose Non dolet1 was an appropriate subject for a young Stoic to commemorate. These experiments had little merit, otherwise they would not have been destroyed on the advice of Cornutus, his friend and teacher and literary executor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0017383500006380
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  • 9
    Electronic Resource
    Electronic Resource
    The Glycoprotein Nature of the Vasoactive Intestinal Peptide Binding Site. Role of Carbohydrates in VIP Binding on HT 29-D4 Cells (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 527 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb27037.x
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of Saharan dust on the rain acidity and atmospheric input to the Mediterranean (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 427-428 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Data were taken from our sampling station located in a clean area near the Bavella Pass (41?50' N, 9?10' E), at 1,200 m above sea level. Systematic observations on rain chemistry have been made since 1980 at this station, using a plastic gauge of 400 cm2 aperture. According to the intensity of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321427a0
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