scholarly journals A CHEMICAL AND HISTOCHEMICAL STUDY OF THE LIPIDES OF THE PYLORIC CECUM OF THE STARFISH, ASTERIAS FORBESI

1955 ◽  
Vol 1 (2) ◽  
pp. 173-182 ◽  
Author(s):  
Manfred L. Karnovsky ◽  
Susan Skilling Jeffrey ◽  
Michaela Smits Thompson ◽  
Helen Wendler Deane
Keyword(s):  
Chemical Analysis ◽  
Histochemical Study ◽  
Chemical Data ◽  
Unsaponifiable Fraction ◽  
Pyloric Cecum ◽  
Glycerol Ethers ◽  
Asterias Forbesi ◽  
Cellular Components ◽  
Histochemical Examination ◽  
Good Agreement

The lipides of the diverticula of Asterias forbesi have been studied by histochemical and biochemical means. Correlations between results obtained by histochemical examination of sections, and chemical analysis of isolated lipide have been made, particularly with respect to phosphatides, steroids, and aldehyde lipides. The results of the histochemical study were in good agreement with the chemical data as to the nature of the phosphatide fraction, the presence of acetone-soluble aldehyde lipides, and the composition of the free droplet fat. Homogenized diverticula were differentially centrifuged in order to establish the distribution of types of lipides in the various cellular components. In addition, data have been presented which demonstrate a direct correlation between the titer of α-glycerol ethers and that of acetone-soluble lipide acetals in the unsaponifiable fraction.

scholarly journals Chemical analysis of NGC 6528: one of the most metal-rich bulge globular clusters

2018 ◽  
Vol 620 ◽  
pp. A96 ◽  
Author(s):  
C. Muñoz ◽  
D. Geisler ◽  
S. Villanova ◽  
I. Saviane ◽  
C. C. Cortés ◽  
...  
Keyword(s):  
High Resolution ◽  
Chemical Analysis ◽  
Iron Content ◽  
Globular Clusters ◽  
Chemical Characterization ◽  
Heavy Elements ◽  
High Resolution Spectroscopy ◽  
Origin And Evolution ◽  
Red Giant ◽  
Good Agreement

Context. The bulge globular clusters (GCs) are key tracers of the bulge, a central and ancient component of our Galaxy. It is essential to understand their formation and evolution to study that of the bulge, as well as their relationship with the other Galactic GC systems (halo and disk GCs). High-resolution spectroscopy is a powerful tool for such studies, allowing us to obtain a detailed chemical characterization and kinematics of the clusters and to compare their chemical patterns with those of their halo and disk counterparts. Aims. Our main goals are to obtain detailed abundances for a sample of seven red giant members of NGC 6528 in order to characterize their chemical composition and study the relationship of this GC with the bulge, and with other bulge, halo, and disk GCs. Moreover, we analyze this cluster’s behavior associated with the multiple-populations phenomenon. Methods. We obtained the stellar parameters and chemical abundances of light elements (Na, Al), iron-peak elements (V, Cr, Mn, Fe, Co, Ni, Cu), α-elements (O, Mg, Si, Ca, Ti) and heavy elements (Zr, Ba, Eu) in seven red giant members of NGC 6528 using high-resolution spectroscopy from FLAMES-UVES. Results. In six stars of our sample we obtained a mean iron content of [Fe/H] = − 0.14 ± 0.03 dex, in good agreement with other studies. We found no significant internal iron spread. We detected one candidate variable star, which was excluded from the mean in iron content, and derived a metallicity in this star of [Fe/H] = − 0.55 ± 0.04 dex. Moreover, we found no extended O-Na anticorrelation but instead only an intrinsic Na spread. In addition, NGC 6528 does not exhibit a Mg-Al anticorrelation, and no significant spread in either Mg or Al. The α and iron-peak elements show good agreement with the bulge field star trend. The heavy elements are slightly dominated by the r-process. The chemical analysis suggests an origin and evolution similar to that of typical old Galactic bulge field stars. Finally, we find remarkable agreement in the chemical patterns of NGC 6528 and another bulge GC, NGC 6553, suggesting a similar origin and evolution.

The petrology and chemical composition of a tholeiite sill on Schaapkraal 68JT, Lydenburg District, Transvaal, South Africa

1970 ◽  
Vol 37 (292) ◽  
pp. 909-915
Author(s):  
C. Frick
Keyword(s):  
South Africa ◽  
High Pressure ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Chemical Data ◽  
Chemical Analyses ◽  
Residual Glass ◽  
Iron Enrichment ◽  
Crystallization Differentiation

SummaryA glass-bearing dolerite, which consists of orthopyroxene phenocrysts (γ 1·689, α 1·678, β 1·680, 2Vα 81°, S.G. 3·35) and a glassy mesostasis (n 1·568, S.G. 3·25), is described petrologically. Three new chemical analyses are given. From the petrological and chemical data it can be concluded that the orthopyroxene formed under intratelluric conditions and probably under high pressure. According to the recalculated chemical analysis of the orthopyroxene 0·22 Al3+ is in the Y position and much less Al3+ in the Z position. The chemical analysis of the residual glass is compared with similar residual glasses, and it shows that iron enrichment characterizes the earlier stages of crystallization differentiation, whereas the later stages are marked by an increase in Si4+, K+, and Na+.

scholarly journals Surface tension of liquid Ti with adsorbed oxygen and a simple associate model for its prediction

2020 ◽  
Vol 49 (1-2) ◽  
pp. 89-105 ◽  
Author(s):  
J. BRILLO ◽  
J. WESSING ◽  
H. KOBATAKE ◽  
H. FUKUYAMA
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Simple Model ◽  
Chemical Analysis ◽  
Mole Fraction ◽  
Tio2 Powder ◽  
Bulk Oxygen ◽  
Electromagnetically Levitated ◽  
Oxygen Mole Fraction ◽  
Good Agreement

Surface tensions of electromagnetically levitated liquid Ti-samples were measured under the influence of oxygen. For this purpose, Ti-O samples were prepared by adding different amounts of TiO2 powder to pure Ti. The surface tension was found to strongly depend on the bulk oxygen mole fraction determined by chemical analysis. The results could be described by a simple model presented in the present work. In this model the Butler equation is applied and the formation of TiO2 – associates are taken into account. Non-ideal interactions ΔH≠0 between titanium and the associates also need to be taken into account. Good agreement with the experimental data is evident and also with a different model developed earlier by us.

The Siena meteorite: Mineralogy and Chemistry

1969 ◽  
Vol 37 (285) ◽  
pp. 34-44 ◽  
Author(s):  
B. Baldanza ◽  
G. R. Levi-Donati ◽  
H. B. Wiik
Keyword(s):  
Chemical Analysis ◽  
Electron Probe ◽  
Mineralogical Composition ◽  
Ordinary Chondrite ◽  
Optical Data ◽  
Electron Probe Analysis ◽  
Microscopical Analysis ◽  
Probe Analysis ◽  
Composition And Structure ◽  
Good Agreement

SummaryThe principal data are collected about the fall and the distribution of the fragments of the Siena, Italy, meteorite (11·6°E., 43·1°N.). A complete individual, weighing 110·55 g, is described in some detail. Crust morphology, mineralogical composition, and structure were studied. Optical data were established by microscopical analysis and both thin and polished sections were observed. Compared with available electron-probe analysis they are found in good agreement. The chemical analysis is Fe 12·93, Ni 1·39, Co 0·09, FeS 5·46, SiO2 37·10, TiO2 0·14, Al2O3, 3·91 FeO 11·46, MnO 0·35, MgO 23·81, CaO 1·63, Na2O 0·90, K2O 0·16, P2O5 0·44, H2O+ 0·10, H2O− 0·00, Cr2O3 0·56, total 100·43. Siena is an ordinary chondrite, with relatively ambiguous characteristics and evident features of recrystallization and metamorphism.

scholarly journals True one cell chemical analysis: a review

The Analyst ◽  
2019 ◽  
Vol 144 (16) ◽  
pp. 4733-4749 ◽  
Author(s):  
Imesha W. De Silva ◽  
Amanda R. Kretsch ◽  
Holly-May Lewis ◽  
Melanie Bailey ◽  
Guido F. Verbeck
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Cellular Components

The constantly growing field of True One Cell (TOC) analysis has provided important information on the direct chemical composition of various cells and cellular components.

scholarly journals Meteorite Struga – overview of previous chemical and recent spectroscopic analyses

2009 ◽  
Vol 28 (1) ◽  
pp. 41
Author(s):  
Biljana Minčeva-Šukarova
Keyword(s):  
Chemical Analysis ◽  
Republic Of Macedonia ◽  
Spectroscopic Analyses ◽  
Geological Institute ◽  
The Town ◽  
Good Agreement

Meteorite Struga fell more than 35 years ago near the town of Struga, Republic of Macedonia. Its fall was notified in the Bulletien of the Geological Institute in Skopje in 1973. Since that time, only one chemical analysis has been reported (in 1990) and most recently, preliminary spectrosocpic investigations (in 2006 and in 2008) have been performed. However, this meteorite has not yet been classified in the World’s Database of Meteorites. The aim of this paper is to collect and summarize all available data published until now on this meteorite and open the possibility to clasify it and list it in the World’s Database of Meteorites. In order to make the results more available, the details of the previous chemical and the recent spectrosocpic analyses on this meteorite are presented in this paper. Collected information from both analyses were used for the description of the characteristics of this meteorite. Previous chemical analysis and the recent spectrosocpic investigations are in good agreement and confirm the earlier classification of this meteorite as stony chondrite of H type.

Rapid chemical analysis of the <2 μm clay fraction using an SEM/EDS technique

Clay Minerals ◽  
2007 ◽  
Vol 42 (4) ◽  
pp. 549-562 ◽  
Author(s):  
T. Clayton ◽  
R. B. Pearce
Keyword(s):  
Chemical Analysis ◽  
Clay Mineral ◽  
Clay Fraction ◽  
Additional Treatment ◽  
Chemical Data ◽  
X Ray Diffraction ◽  
Analytical Technique ◽  
Conductive Surface ◽  
Mineral Mixtures ◽  
Analytical Errors

AbstractScanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) analysis of smear slides of oriented <2 mm clay fractions is shown to be a reliable and rapid analytical technique for providing chemical data on clay mineral mixtures. Such smear slides are routinely prepared for clay mineral analysis by X-ray diffraction and the only additional treatment required for chemical analysis by EDS is carbon-coating to form an electronically conductive surface. Using standard clays, mixtures of standard clays, and sediment samples, it is shown that sample thickness, sample heterogeneity and surface roughness do not introduce significant analytical errors, although the presence of non-clay mineral phases such as calcite, dolomite, quartz and pyrite may introduce minor discrepancies. Chemical data complement the XRD analyses and increase their accuracy and reliability.

23Na 2D 3QMAS NMR and 29Si, 27Al MAS NMR investigation of Laponite and synthetic saponites of variable interlayer charge

Clay Minerals ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. 63-69 ◽  
Author(s):  
L. Delevoye ◽  
J . -L. Robert ◽  
J . Grandjean
Keyword(s):  
High Resolution ◽  
Chemical Shift ◽  
Chemical Analysis ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
High Resolution Spectrum ◽  
Isotropic Chemical Shift ◽  
Quadrupolar Interaction ◽  
27Al Mas Nmr ◽  
Good Agreement

Abstract29Si, 27Al MAS NMR is used to characterize Laponite RD and synthetic saponites of variable interlayer charge. The Si/Al ratios are in good agreement with the calculated charge from chemical analysis except for the lowest-charged saponite. In contrast to the 29Si MAS NMR spectra in which resolved signals are detected, the 27Al MAS NMR spectra show one signal whose linewidth increases with the clay charge. The water content of the clay samples was obtained from 1H MAS NMR.The 2D MQMAS NMR technique is required to obtain a high-resolution spectrum of nuclei with strong quadrupolar interaction. This method was applied to the 23Na nucleus of clay counterions and to the 27Al structural nucleus. One well-defined 23Na NMR signal is observed for all the clays studied except the highest-charged saponite. Possible explanations for this different behaviour are discussed. The calculated isotropic chemical shift evolves progressively with the clay charge whereas the deduced quadrupolar interaction does not change significantly. The 27Al 2D 3QMAS technique was not able to resolve more than one signal.

Toxicity of Gases from Full-Scale Room Fires Involving Fire Retardant Contents

1995 ◽  
Vol 13 (1) ◽  
pp. 23-42 ◽  
Author(s):  
T. Morikawa ◽  
T. Okada ◽  
M. Kajiwara ◽  
Y. Sato ◽  
Y. Tsuda
Keyword(s):  
Chemical Analysis ◽  
Fire Retardant ◽  
Full Scale ◽  
Room Fires ◽  
Corrugated Cardboard ◽  
Fire Experiments ◽  
Good Agreement

Fire experiments were conducted in a 2-story fire resistant house using one of the first floor rooms as the burn room with various fire retardant or non-fire retardant items. The toxicity of the fire effluents was determined both by chemical analysis and bioassay techniques. Plywood boards arranged as corner walls and crumpled newsprint in a corrugated cardboard box were used as fire initiators. HCN and CO were the two major toxicants. The HCl level was generally and unexpectedly low in terms of toxicity. There was no case where fires involving fire retardant materials were more dangerous in tox icity than those of non-fire retardant ones. Calculated incapacitation times were in roughly good agreement with the actual incapacitation times for rab bits when the toxicants were limited to HCN and CO.

scholarly journals Abundances of seven red giants in the open cluster NGC 3114

2009 ◽  
Vol 5 (S266) ◽  
pp. 495-498
Author(s):  
C. B. Pereira ◽  
C. Quireza
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Galactic Disk ◽  
Open Cluster ◽  
Open Clusters ◽  
Red Giants ◽  
The Sun ◽  
Atmospheric Parameters ◽  
Red Giant ◽  
Good Agreement

AbstractWe present a chemical analysis of seven red giants in the open cluster NGC 3114. Our main goal is to investigate the chemical composition of this cluster, which is not yet available in the literature. We employed the FEROS spectrograph on the ESO 2.2m telescope. Atmospheric parameters and metallicity were derived from the measured equivalent widths of several iron lines using the spectral code moog and Kurucz model atmospheres. We obtained the abundances of O, Al, Ca, Mg, Si, Ti, Ni, Cr, Sc, Y, Zr, La, Ce and Nd by measuring the equivalent widths of the absorption lines of these elements. A mean metallicity of [Fe/H] = 0.05 ± 0.13 relative to the Sun was determined from the data of the red-giant members. This result is in good agreement with the Galactic-disk radial distribution of iron traced by open clusters. We did not find any intrinsic star-to-star scatter in the [element/Fe] ratios for the stars in this cluster. We compare our results with investigations of other open clusters. An age of 8.2 Gyr is derived from isochrone fits.

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