Terrestrial Ring Complexes and Their Origin

2021 ◽  
pp. 193-198
Author(s):  
Gilbert Fielder
Keyword(s):  
Ring Complexes

The ring complexes of the Eastern Desert of Egypt

1985 ◽  
Vol 3 (1-2) ◽  
pp. 77-82 ◽  
Author(s):  
M.F. El Ramly ◽  
A.A.A. Hussein
Keyword(s):  
Eastern Desert ◽  
Ring Complexes

On an Occurrence of Fayalite Quartz-Monzonite in the Basement Complex around Bauchi, Northern Nigeria

1961 ◽  
Vol 98 (6) ◽  
pp. 473-482 ◽  
Author(s):  
M. O. Oyawoye
Keyword(s):  
Linear Structure ◽  
Northern Nigeria ◽  
Basement Complex ◽  
Green Colour ◽  
Quartz Monzonite ◽  
Ring Complexes ◽  
High Level ◽  
Mineral Constituents ◽  
Ring Dyke

AbstractAn unusual fayalite-bearing quartz-monzonite occurs around Bauchi in Northern Nigeria and is distinguished from the high-level fayalite granites of the Newer Granites ring complexes by the presence of a linear structure conformable with those in the surrounding rocks, the gradational nature of its contacts, the extreme coarseness of its mineral constituents and the abundance of myrmekite. It is similar to them in its distinctive green colour and in the high FeO: Fe2O3 ratio. The rock is believed to be definitely older than the rocks of the ring-dyke complexes.

scholarly journals Rotational analysis of naphthol-aromatic ring complexes stabilized by electrostatic and dispersion interactions

2022 ◽  
Author(s):  
María Mar Quesada-Moreno ◽  
Melanie Schnell ◽  
Daniel A. Obenchain
Keyword(s):  
Aromatic Ring ◽  
Substitution Effects ◽  
Rotational Analysis ◽  
Dispersion Interactions ◽  
Aromatic Species ◽  
Ring Complexes ◽  
Species Substitution

For complexes involving aromatic species, substitution effects can influence the preferred geometry.

scholarly journals Microtubule organization: A complex solution

2016 ◽  
Vol 213 (6) ◽  
pp. 609-612 ◽  
Author(s):  
Paul T. Conduit
Keyword(s):  
Complex Solution ◽  
Microtubule Nucleation ◽  
Microtubule Organization ◽  
Microtubule Organizing Centers ◽  
Cell Biol ◽  
Ring Complexes ◽  
And Function

Microtubule nucleation within cells is catalyzed by γ-tubulin ring complexes localized at specific microtubule-organizing centers. In this issue, Muroyama et al. (2016. J. Cell Biol. http://dx.doi.org/10.1083/jcb.201601099) reveal heterogeneity in the composition and function of these complexes, with wide implications for how cells organize their microtubule arrays.

Donor-Acceptor Ring-in-Ring Complexes

2011 ◽  
Vol 18 (1) ◽  
pp. 202-212 ◽  
Author(s):  
Ross S. Forgan ◽  
Cheng Wang ◽  
Douglas C. Friedman ◽  
Jason M. Spruell ◽  
Charlotte L. Stern ◽  
...  
Keyword(s):  
Donor Acceptor ◽  
Ring Complexes

scholarly journals Carbonylniobium Chemistry, IV Derivatives of η5 -C5H5Nb(CO)4 with Tridentate Phosphines

1983 ◽  
Vol 38 (4) ◽  
pp. 446-448 ◽  
Author(s):  
Martin Hoch ◽  
Dieter Rehder
Keyword(s):  
Nmr Spectra ◽  
Membered Ring ◽  
Vanadium Complexes ◽  
Ring Complexes ◽  
Derivatives Of ◽  
Induced Reaction

Abstract The photo-induced reaction between CpNb(CO)4 and Ph2P(CH2)2PR(CH2)2PPh2 (L; R = Ph, Cy) yields the chelated five-membered ring complexes cis-[CpNb(CO)2L] (two isomers in the case of R = Cy). The uncordinated PPh2 group reacts with CpNb(CO)3THF to form CpNb(CO)2(μ-L)CpNb(CO)3. IR, 31P and 93Nb NMR spectra are discussed and compared with corresponding data of the analogous vanadium complexes.

Liquid immiscibility and the origin of alkali-poor carbonatites

1988 ◽  
Vol 52 (364) ◽  
pp. 43-55 ◽  
Author(s):  
B. A. Kjarsgaard ◽  
D. L. Hamilton
Keyword(s):  
Liquid Immiscibility ◽  
Raw Material ◽  
Coarse Grained ◽  
Rock Types ◽  
Liquid Fractionation ◽  
Ring Complexes ◽  
The Common ◽  
Melt Cooling ◽  
Carbonate Melt ◽  
Common Sequence

AbstractThe work on liquid immiscibility in carbonate-silicate systems of Freestone and Hamilton (1980) has been extended to include alkali-poor and alkali-free compositions. Immiscibility is shown to occur on the joins albite-calcite and anorthite-calcite at 5 kbar. These results make it possible to interpret ocellar structure between calcite-rich spheroids in lamproite or kimberlite host rock as products of liquid immiscibility. The common sequence of rock types found in carbonatite complexes of melilitite-ijolite-urtite-phonolite is interpreted as being the result of both fractional crystallization and liquid fractionation, the corresponding carbonatite composition changing from nearly pure CaCO3 (±MgCO3) progressively to natrocarbonate. A carbonate melt cooling in isolation will suffer crystal fractionation, the residual liquid producing the rarer ferrocarbonatites, etc., whilst the crystal accumulate of calcite (dolomite) plus other phases such as magnetite, apatite, baryte, pyrochlore, etc., are the raw material for the coarse-grained intrusive carbonatites commonly found in ring complexes.

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