Diatom extracted species

In fact, such biomimetic molecules demonstrate the ability to tailor the growth of silica nanoparticles in a way that is very similar to diatom-extracted species. However, they demonstrate the same limitations in terms of morphological control of nanoparticle assembly. This is because the diatom shell architecture results not only from interactions of silica precursors with templating molecules but also benefits from a cell-driven molding of the vesicular compartment where silicification occurs [29]. Thus, it is very likely that diatom-like synthetic silica will only be achieved when such confinement/molding effects are taken into account in the design of biomimetic experiments [30]. 

The lower halides of Bi are rather different. The diatomic species BiX (X = Cl, Br, I) occur in the equilibrium vapour above heated Bi-BiX3 mixtures. A black crystalline lower chloride of composition BiCli.iev is obtained by heating Bi-BiCls mixtures to 325° and cooling them during 1-2 weeks to 270° before removing excess BiC by sublimation or extraction into... 

We have found the method described by Sullivan (11) extremely useful for extracting diatoms out of marine sediment deposits (see Fig. 3). Using the following technique, Sullivan (11) was able to identify new genera and species of diatoms. 

The major component, 1-frustulin, is one of a number of isoforms of a 75 kDa protein that is immunologically related to proteins extracted from the cell walls of other diatom species, namely Navicula pelliculosa, Nitzschia alba, N. angularis and Phaeodactylum tricornutum. 

In many cases the pattern of high on and slow off rate constants seen with diatomic molecules is mirrored with these organic ligands [see, for example, (S2)]. The formation of the fluoro species has been suggested (37) to be of use in the detection of Fe(III) Lb in nodule slices or extracts. When used in large excess [concentrations up to... 

Most practical combustion devices operate at pressures considerably well above atmospheric. The CARS signatures, used to extract temperature and species concentration Information, Figs. 3 and 4, are quite pressure sensitive for most of the heavy diatomic and trlatomlc molecules due to the phenomenon of colllslonal narrowing. Even In the absence of such band narrowing, the signatures would and do exhibit pressure sensitivity due to constructive Interferences among neighboring Raman transitions. 

The LCPAs are nonprotein components (>3.5 kDa) that have been found encapsulated in the silica matrix of the diatom, and isolated through a series of H F extractions [59]. Unlike silafHns, which have a peptide backbone, these polyamines consist of linear chains of C-N-hnked PEI units that are bonded to a putrescine or putrescine derivative backbone. The chemical composition of these LCPAs is unique for each diatom species, with variable repetitions and degrees of methylation. 

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