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  • 1
    Electronic Resource
    Electronic Resource
    Shattering of SiMe3+ during surface-induced dissociation (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 10976-10983 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We provide experimental evidence that upon hyperthermal impact of Si(CD3)3+ ions with an organic surface, a portion of the ions undergo dissociation while still in contact with the surface. We use a tandem configuration of quadrupole mass spectrometers along with an energy analyzer to measure the kinetic energy distributions of the fragments that form as a result of the surface scattering of 25 eV Si(CD3)3+. These distributions are different for scattering from a clean Au(111) surface versus scattering from an organic surface composed of a self-assembled monolayer of hexanethiolate on Au(111). Parent and fragment ions recoil from the clean Au(111) surface with the same velocity, as is expected for fragmentation away from the surface. However, the same scattering products recoil from the organic surface with different velocities but similar energies, suggesting that the fragmentation dynamics are modified by surface interactions. We perform molecular dynamics simulations which predict residence times of ∼210 fs at the organic surface and ∼20 fs at the Au surface. The simulations also predict that 13% and 31% of the ions fragment within 1.1 ps of surface impact at the organic and Au surfaces, respectively. Thus, the experimental observation of dissociation at only the organic surface results from its longer ion-surface interaction time. The fragmentation time scale predicted by Rice–Ramsperger-Kassel–Marcus calculations is yet longer, suggesting that at least a portion of the surface-induced dissociation of Si(CD3)3+ may occur via a nonstatistical mechanism. Our interpretation draws heavily from an analogous "shattering" mechanism previously proposed for cluster-surface scattering [E. Hendell, U. Even, T. Raz, and R. D. Levine, Phys. Rev. Lett. 75, 2670 (1995)]. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477737
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  • 2
    Electronic Resource
    Electronic Resource
    Classical dynamics simulations of SiMe3+ ion–surface scattering (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 10337-10348 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents classical dynamics simulations of Si(CD3)3+scattering from a hexanethiolate self-assembled monolayer on Au(111) and from a clean Au(111) surface. Simulations are performed with a united atom model using purely repulsive scattering potentials. These simulations predict the partitioning of the incident ion kinetic energy into the scattered ion kinetic energy and the internal modes of both the surface and the ion. For the organic surface, the simulations predict energy transfer to surface, ion internal, and ion kinetic energies of 0.78, 0.11, and 0.12 of the collision energy. The corresponding transfer efficiencies of 0.12, 0.21, and 0.65 were calculated for the Au(111) surface. These computational results compare well with the experimental results on the same systems which are reported in the preceding paper. The simulations predict near specular scattering for both surfaces. They also demonstrate that the ion penetrates only the topmost two to three layers of Me atoms of the organic surface and that it spends up to 250 fs in contact with the surface. Finally, these calculations determine the dependence of energy transfer on the incident ion angle. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474069
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  • 3
    Electronic Resource
    Electronic Resource
    Energy transfer and surface-induced dissociation for SiMe3+ scattering off clean and adsorbate covered metals (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 10329-10336 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We scatter 10–70 eV SiMe3+ from clean Au(111), a hexanethiolate self-assembled monolayer on Au(111) (C6), and a NiO(111) layer grown on top of Ni(111). We examine both the scattered ion fragmentation patterns and the kinetic energy distribution spectra (KEDS) as a function of the incident ion energy E. Surface infrared and KEDS data indicate that we have prepared a saturated monolayer of hexanethiolate (C6) on Au(111) where the C6 carbon backbone is predominantly upright on the surface. C6 monolayers with a mixture of prone and upright C6 can also be prepared, but only the upright C6 monolayers are used for ion scattering experiments. The fragment ion distributions and the KEDS are then used to determine the channeling of the incident SiMe3+ion energy into the scattered ion internal energy Eint, and the scattered ion kinetic energy Escat. Overall, we find the order of Eint/E for SiMe3+ to be Au(111)(very-much-greater-than)NiO(111)〉C6. From the Escat values, we find that MiSe3+ scattering off C6 is highly inelastic while scattering off Au is much more elastic. We use this information to calculate the energy (Esurf) which is channeled into the surface as a result of the collision for C6 and Au(111). By comparing the KEDS for the parent and fragment ions, we determine the importance of unimolecular dissociation off the various surfaces. In the accompanying paper, we present a series of classical dynamics simulations to explain and supplement these experimental results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474103
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  • 4
    Electronic Resource
    Electronic Resource
    Children’s Anger Attribution Bias: Relations to Family Environment and Social Adjustment (2000)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd.
    Social development 9 (2000), S. 0 
    Details
    ISSN: 1467-9507
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Psychology
    Notes: We examined the relations of caregiver depression and family instability to preschool children’s anger attribution bias and emotion attribution accuracy on a test of emotion situation knowledge. After controlling for age, gender, and verbal ability, caregiver depression and family instability predicted children’s anger attribution bias but not the overall accuracy of their emotion attributions. We also divided children into groups low and high on teacher reports of aggression and groups low and high on teacher reports of peer rejection and examined the anger attribution bias of these groups. For boys but not girls, greater anger attribution bias predicted higher levels of aggression. For all children, greater anger attribution bias predicted higher levels of peer rejection. Results suggest that the misattribution of anger to others may be an important component of some children’s early emotional and social difficulties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-9507.00126
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  • 5
    Electronic Resource
    Electronic Resource
    Boys’ Maladaptive Social Information Processing, Family Emotional Climate, and Pathways to Early Conduct Problems (2003)
    Oxford, UK : Blackwell Publishing Ltd.
    Social development 12 (2003), S. 0 
    Details
    ISSN: 1467-9507
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Psychology
    Notes: Maladaptive social information processing characterizes many children with behavioral adjustment difficulties. Yet, we know little about the antecedents of maladaptive social information processing. The present study examined the relations between early family risk and later maladaptive social information processing and conduct problems in a sample of 178 economically disadvantaged boys. Early childhood assessments of socioeconomic disadvantage (low SES, single parent status, low maternal education) and maternal depression predicted boys’ maladaptive response generation and conduct problems at age 10, accounting for 6% and 14% of the variances, respectively, but not hostile attribution bias. Maladaptive response generation also fit a model of significant partial mediation of the effects of socioeconomic disadvantage on conduct problems. Results suggest the importance of the family's emotional climate during children's early development for their later adjustment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-9507.00242
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  • 6
    Electronic Resource
    Electronic Resource
    A mechanosensory complex that mediates the endothelial cell response to fluid shear stress (2005)
    [s.l.] : Nature Publishing Group
    Nature 437 (2005), S. 426-431 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Shear stress is a fundamental determinant of vascular homeostasis, regulating vascular remodelling, cardiac development and atherogenesis, but the mechanisms of transduction are poorly understood. Previous work showed that the conversion of integrins to a high-affinity state mediates a subset ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03952
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  • 7
    Electronic Resource
    Electronic Resource
    Acceleration of activation and inactivation by the β subunit of the skeletal muscle calcium channel (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 159-162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LCa.ll cells9 were cotransfected with various combinations of expression plasmids for a2, ft and y subunit cDNAs. Northern blot analyses of poly(A)+ RNA preparations from the various transfected cell lines (Fig. la, b) confirmed that the parental LtkT cells expressed no transcripts for the skeletal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/352159a0
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  • 8
    Electronic Resource
    Electronic Resource
    Tomographic renal cortical scintigraphy: Correlation with intravenous urography, computed tomography, ultrasonography, angiography, and nuclear magnetic resonance imaging (1985)
    Springer
    European journal of nuclear medicine 11 (1985), S. 217-220 
    Details
    ISSN: 1619-7089
    Keywords: Hypernephromas ; Renal cortex imaging ; Columns of Bertin ; Renal tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study evaluates single-photon renal tomoscintigraphy (SPECT) in the evaluation of renal masses and correlates this modality, where indicated, with computed tomography (CT), ultrasonography (US), angiography (ANGIO) and nuclear magnetic resonance imaging (NMR). Eight patients with renal cortical lesions detected on intravenous urography (IVP) were evaluated by SPECT and planar nuclear imaging using Tc-99m glucoheptonate (GH). Three of these patients were felt particularly likely to have renal tumors and were additionally evaluated with US, CT, ANGIO and NMR. The five patients with nodules on IVP that were not particularly suggestive of malignancy had functioning, benign, renal tissue accounting for their IVP lesions. Four of five were found by planar-GH nuclear imaging, five/five by SPECT-GH. In addition, SPECT-GH allowed better “confidence” in the normal renal tissue diagnosis in three/five cases. Of the three renal lesions that were highly suggestive of malignancy, two were hypernephromas and one was hypertrophied functioning cortical tissue. All three were correctly identified prospectively on SPECT-GH; however, one hypernephroma was missed on planar-GH. NMR, CT, and ANGIO detected only one of two hypernephromas prospectively (US detected both); all four modalities incorrectly diagnosed the hypertrophied tissue suggestive of malignancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279072
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  • 9
    Electronic Resource
    Electronic Resource
    Diagnosis of exercise-induced left bundle branch block at rest by scintigraphic phase analysis (1986)
    Springer
    European journal of nuclear medicine 11 (1986), S. 434-437 
    Details
    ISSN: 1619-7089
    Keywords: Heart ; radionuclide studies ; Heart ; conduction disease ; Heart ; phase analysis ; Bundle branch block
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Accurate diagnosis of diseases of the ventricular conducting system is essential for their appropriate therapy. some conduction abnormalities, such as exercise-induced left bundle branch block (EX-LBBB), are not apparent on resting electrocardiograms. Phase analysis of rest and exercise radionuclide ventriculograms (RVG's) was used to compare four EX-LBBB patients with six normal controls. All patients had normal resting electrocardiograms, ejection fractions, and visually normal wall motion. First harmonic phase images were generated reflecting the timing of ventricular contraction. Dynamic phase displays were reviewed and graded in a blinded fashion by three independent experienced observers. Phase angle histograms of the right and left ventricle were determined for both resting and exercise images. The mean phase angle and standard deviation were also calculated for each ventricle. Visual grading of the resting phase images failed to show a significant difference between normal patients and patients with EX-LBBB. Quantitative analysis, however, revealed a significant difference in mean phase angle differences (LV-RV) in resting studies: 0.8° (±1.9° SEM) in normals versus 9.3° (±2.3° SEM) in EX-LBBB patients (P〈0.03). Exercise accentuated the phase angle differences: 1.8° in normals vs. 31.2° in EX-LBBB patients (P〈0.001). Quantitative phase analysis of resting RVG's permits the diagnosis of cardiac conduction disease that is not apparent on the resting EKG and may result in better monitoring and treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261005
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  • 10
    Electronic Resource
    Electronic Resource
    Combination chemotherapy with cyclophosphamide, vincristine, procarbazine, and prednisone (COPP) in children with brain tumors (1985)
    Springer
    Journal of neuro-oncology 3 (1985), S. 263-269 
    Details
    ISSN: 1573-7373
    Keywords: COPP chemotherapy ; brain tumors ; cyclophosphamide ; vincristine ; procarbazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The chemotherapeutic combination of cyclophosphamide, vincristine, procarbazine, and prednisone (COPP) was used to treat 15 children with recurrent central nervous system tumors and seven children with newly diagnosed brainstem tumors. In patients with recurrent tumors, marginal activity was seen in various histologic types. COPP chemotherapy was clearly ineffective in patients with brainstem tumors. Toxicity consisted of mild to moderate myelosuppression and neurotoxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165188
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