The structure of plasma dissociated zircon

Wong, Ai Ming; McPherson, R.

doi:10.1007/bf00553998

Cited by 5 publications

(4 citation statements)

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“…The electron micrographs (Fig. 7) of the (25/75) composite heat treated to 1773 K (2h) appear to show ZrO2 particles embedded in the SiO2 matrix [11]. The particle sizes of the composite powders were extremely low; of the order of 50nm in the case of (25/75) composite and 20 nm in the case of (50/50) composite.…”

Section: Resultsmentioning

confidence: 97%

Crystallization studies of ZrO2−SiO2 composite gels

Nagarajan

Rao

1989

J Mater Sci

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Composite ZrO2-SiO2 powders were prepared using a gel route. Morphological and crystallographic features of ZrO 2 particles formed during the heat treatment, and the particle sizes of the composites have been investigated. The following polymorphic changes have been observed during the heat treatment: amorphous -+ metastable-cubic/tetragonal ZrO 2 --~ tetragonal ZrO2 ~ monoclinic ZrO2. SiO2 crystallizes above 1273 K. The martensitic transformation of Zr02 (t -, m) was observed in situ, when exposed to a high-energy electron beam. These results are important in the production of ZrO2-toughened ceramics of controlled microstructure.

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Section: Resultsmentioning

confidence: 97%

Crystallization studies of ZrO2−SiO2 composite gels

Nagarajan

Rao

1989

J Mater Sci

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“…This accounts for the strong correlation between codon allocation and biosynthetic relationships among the amino acids, as well as the lack of prebiotictype synthesis for many of the amino acids used in proteins to-day [10][11][12][13][14]. In this regard, the most sustained source of improvement of protein function is evidently that furnished by an increased variety of amino acid side chains.…”

Section: Post-translational Modificationsmentioning

confidence: 99%

Origin of genetically encoded protein synthesis: A model based on selection for RNA peptidation

Wong

1991

Origins Life Evol Biosphere

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The difficulty in explaining the origin of genetic coding centres on the need to identify selective advantages that could account for the synthesis of peptidyl-tRNA, the essential intermediate in genetically programmed translation. It is resolved by a recognition of the functional advantages derivable from the post-transcriptional addition of peptide cofactors to RNA apo-catalysts. This enables the formulation of a theory for the origin of the genetic encoding of protein synthesis by RNA.

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“…As shown in Figure 4a, most of the cracks observed in the as-sprayed sample disappeared during the heat treatment at 1473 K. Such crack healing is probably due to sintering and volume expansion of zr0 2 during the tm transformation. Figure 4b shows that m-Zr0 2 particles grew in columnar shape perpendicular to the surface of the 578 coating (2). The 1673 K sample is composed of ZrSi0 4 with m-Zr0 2 particles and many pores (Figures 5a and b).…”

Section: Microstructural Observationmentioning

confidence: 93%