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Oliver, Derek R.; Finlayson, Trevor R

doi:10.1088/0022-3727/31/15/014

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…After 31 s of growth the density increases rapidly to 2 × 10 9 cm -2 and then remains roughly constant for longer growth times up to 125 s. Simultaneously, 2D islands appeared after 31 s of InGaN growth and the density of these 2D islands steadily increases up to 125 s, until the wetting layer (WL) consists almost entirely of irregular 2D islands. This observation corresponds to AFM data published elsewhere [4,5]. Here, we report on the TEM characterisation of the observed 2D and 3D islands.…”

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Towards a better understanding of nano‐islands formed during atmospheric pressure MOVPE

Laak¹,

Oliver

Barnard

et al. 2006

Phys. Status Solidi (c)

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We report on transmission electron microscopy (TEM) characterisation of nano-islands formed during atmospheric pressure growth of InGaN on GaN by metal-organic vapour phase epitaxy (MOVPE). Although initial results seemed to indicate that three-dimensional InGaN nano-islands had formed, detailed TEM characterisation revealed that the islands do not have a hexagonal crystal structure, and electron energy loss spectroscopy suggests that the observed structures are metallic indium droplets formed during growth, which may be partially nitrided, rather than the expected strain-induced epitaxial InGaN nano-islands.

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“…beam electron diffraction (CBED) and the electron energy loss spectroscopy (EELS) were performed with a FEI Tecnai F20 field emission TEM in scanning transmission electron microscopy (STEM) mode. Further growth details can be found elsewhere [5].…”

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confidence: 99%

Towards a better understanding of nano‐islands formed during atmospheric pressure MOVPE

Laak¹,

Oliver

Barnard

et al. 2006

Phys. Status Solidi (c)

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“…By modeling the sputtering process in HCDs, the metal atom population is calculated based on the solution of the continuity and flux equations. This source term can also be given by the thermalization profile like, for example, in the work of Oliver and Finlayson, 22 where the initial flux of sputtered metal atoms was generated by a Monte Carlo ͑MC͒ model in combination with experimental data, and the thermalization profile was calculated based on the continuous slowing down approximation. This source term can also be given by the thermalization profile like, for example, in the work of Oliver and Finlayson, 22 where the initial flux of sputtered metal atoms was generated by a Monte Carlo ͑MC͒ model in combination with experimental data, and the thermalization profile was calculated based on the continuous slowing down approximation.…”

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confidence: 99%

Study of the sputtered Cu atoms and Cu+ ions in a hollow cathode glow discharge using a hybrid model

Baguer

Bogaerts

2005

Journal of Applied Physics

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Role of the fast Ar atoms, Ar + ions, and metastable Ar atoms in a hollow cathode glow discharge: Study by a hybrid modelThe role of the Cu atoms sputtered from the cathode material in a cylindrical hollow cathode discharge ͑HCD͒ and the corresponding Cu + ions are studied with a self-consistent model based on the principle of Monte Carlo ͑MC͒ and fluid simulations. In order to obtain a more realistic view of the discharge processes, this model is coupled with other submodels, which describe the behavior of electrons, fast Ar atoms, Ar + ions, and Ar metastable atoms, also based on the principles of MC and fluid simulations. Typical results are, among others, the thermalization profile of the Cu atoms, the fast Cu atom, the thermal Cu atom and Cu + ion fluxes and densities, and the energy distribution of the Cu + ions. It was found that the contribution of the Ar + ions to the sputtering was the most significant, followed by the fast Ar atoms. At the cathode bottom, there was no net sputtered flux but a net amount of redeposition. Throughout the discharge volume, at all the conditions investigated, the largest concentration of Cu atoms was found in the lower half of the HCD, close to the bottom. Penning ionization was found the main ionization mechanism for the Cu atoms. The ionization degree of copper atoms was found to be in the same order as for the argon atoms ͑10 −4 ͒.

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“…This can in turn modulate the rate of translation (4) and in some cases induce translational stalling to regulate gene expression (5). For instance, stalling during translation of the SecM leader peptide in Escherichia coli (6-8) affects the expression of the downstream secA gene (9). …”

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Structural Insight into Nascent Polypeptide Chain–Mediated Translational Stalling

Seidelt

Innis

Wilson

et al. 2009

Science

259

326

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Expression of the Escherichia coli tryptophanase operon depends upon ribosome stalling during translation of the upstream TnaC leader peptide, a process for which interactions between the TnaC nascent chain and the ribosomal exit tunnel are critical. We determined a 5.8 Å resolution cryo-electron microscopy and single particle reconstruction of a ribosome stalled during translation of the tnaC leader gene. The nascent chain was extended within the exit tunnel, making contacts with ribosomal components at distinct sites. Upon stalling, two conserved residues within the peptidyltransferase center adopted conformations that preclude binding of release factors. We propose a model whereby interactions within the tunnel are relayed to the peptidyltransferase center to inhibit translation. Moreover, we show that nascent chains adopt distinct conformations within the ribosomal exit tunnel.

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Cited by 8 publications

References 33 publications

Towards a better understanding of nano‐islands formed during atmospheric pressure MOVPE

Towards a better understanding of nano‐islands formed during atmospheric pressure MOVPE

Study of the sputtered Cu atoms and Cu+ ions in a hollow cathode glow discharge using a hybrid model

Structural Insight into Nascent Polypeptide Chain–Mediated Translational Stalling

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