scholarly journals Hydration level significantly impacts the freezable - and unfreezable -water contents of native and modified starches

2020 ◽  
Author(s):  
Kamil Emre GERÇEKASLAN
Keyword(s):  
Hydration Level ◽  
Modified Starches ◽  
Water Contents ◽  
Unfreezable Water

Evaluation of Modified Starches Used in Mining for Application in Drilling Fluids

2017 ◽  
Author(s):  
Sarah Silva ◽  
Luciana Amorim ◽  
Karine Nóbrega ◽  
Hélio Lira ◽  
Juliano Magalhães
Keyword(s):  
Drilling Fluids ◽  
Modified Starches

A review of the composition and evolution of hydrocarbon gases during solidification of the Ilímaussaq alkaline complex, South Greenland

2001 ◽  
pp. 159-166 ◽  
Author(s):  
Jens Konnerup-Madsen
Keyword(s):  
Nepheline Syenite ◽  
Subsequent Development ◽  
High Water ◽  
Vapour Phase ◽  
Low Carbon ◽  
Low Oxygen ◽  
Alkaline Complex ◽  
Hydrocarbon Gases ◽  
Wide Range ◽  
Water Contents

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Konnerup-Madsen, J. (2001). A review of the composition and evolution of hydrocarbon gases during solidification of the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin, 190, 159-166. https://doi.org/10.34194/ggub.v190.5187 _______________ Fluid inclusions in minerals from agpaitic nepheline syenites and hydrothermal veins in the Ilímaussaq complex and in similar agpaitic complexes on the Kola Peninsula, Russia, are dominated by hydrocarbon gases (predominantly methane) and hydrogen. Such volatile compositions differ considerably from those of most other igneous rocks and their formation and entrapment in minerals reflects low oxygen fugacities and a wide range of crystallisation temperatures extending to a low-temperature solidus. Their composition reflects initial low carbon contents and high water contents of the magma resulting in the exsolution of a waterrich CO2–H2O dominated vapour phase. Fractionation of chlorides into the vapour phase results in high salinities and the subsequent development of a heterogeneous vapour phase with a highly saline aqueous-rich fraction and a methane-dominated fraction, with preferential entrapment of the latter, possibly due to different wetting characteristics. The light stable isotope compositions support an abiogenic origin for the hydrocarbons in agpaitic nepheline syenite complexes.

Soil Mixer for a Wide Range of Water Contents

1990 ◽  
Vol 54 (2) ◽  
pp. 555-557 ◽  
Author(s):  
Ralph G. Nash ◽  
M. Leroy Beall
Keyword(s):  
Wide Range ◽  
Water Contents

ESTIMATING WATER CONTENTS OF BISHOP TUFF MAGMA FROM HYDROXYL CONCENTRATIONS IN FELDSPAR PHENOCRYSTS

2017 ◽  
Author(s):  
Adam Nordling ◽  
◽  
Elizabeth McTaggart ◽  
Elizabeth A. Johnson ◽  
Madison L. Myers ◽  
...  
Keyword(s):  
Bishop Tuff ◽  
Water Contents

INSIGHTS INTO MAGMATIC WATER CONTENTS AT THE ONSET OF A YELLOWSTONE SUPERERUPTION FROM HYDROXYL CONTENTS IN FELDSPAR

2017 ◽  
Author(s):  
Elizabeth McTaggart ◽  
◽  
Adam Nordling ◽  
Elizabeth A. Johnson ◽  
Madison L. Myers ◽  
...  
Keyword(s):  
Magmatic Water ◽  
Water Contents

VARIATIONS IN WATER CONTENTS AND HYDROGEN ISOTOPIC COMPOSITIONS OF IGNEOUS AND METAMORPHIC AMPHIBOLES

2020 ◽  
Author(s):  
Julia Chen ◽  
◽  
Barbara Ratschbacher ◽  
Barbara Ratschbacher ◽  
Claire E. Bucholz ◽  
...  
Keyword(s):  
Isotopic Compositions ◽  
Water Contents

Drifting Through a Planetary System

2018 ◽  
Author(s):  
Karel Schrijver
Keyword(s):  
Seventeenth Century ◽  
Solar System ◽  
Virtual Worlds ◽  
Planetary System ◽  
System P ◽  
History Of ◽  
Or Team ◽  
Water Contents

This chapter describes how the first found exoplanets presented puzzles: they orbited where they should not have formed or where they could not have survived the death of their stars. The Solar System had its own puzzles to add: Mars is smaller than expected, while Venus, Earth, and Mars had more water—at least at one time—than could be understood. This chapter shows how astronomers worked through the combination of these puzzles: now we appreciate that planets can change their orbits, scatter water-bearing asteroids about, steal material from growing planets, or team up with other planets to stabilize their future. The special history of Jupiter and Saturn as a pair bringing both destruction and water to Earth emerged from the study of seventeenth-century resonant clocks, from the water contents of asteroids, and from experiments with supercomputers imposing the laws of physics on virtual worlds.

Effects of developmental status and dehydration rate on characteristics of water and desiccation-sensitivity in recalcitrant seeds of Camellia sinensis

1993 ◽  
Vol 3 (3) ◽  
pp. 155-166 ◽  
Author(s):  
Patricia Berjak ◽  
Christina W. Vertucci ◽  
N. W. Pammenter
Keyword(s):  
Camellia Sinensis ◽  
Developmental Stages ◽  
Scanning Calorimetry ◽  
Tissue Water ◽  
Embryonic Axes ◽  
Freezable Water ◽  
Desiccation Sensitivity ◽  
Accumulation Phase ◽  
Whole Seed ◽  
Water Contents

AbstractThe effect of rate of dehydration was assessed for embryonic axes from mature seeds of Camellia sinensis and the desiccation sensitivity of axes of different developmental stages was estimated using electrolyte leakage. Rapidly (flash) dried excised axes suffered desiccation damage at lower water contents (0.4 g H2O (g DW)−1) than axes dried more slowly in the whole seed (0.9 g H2O (g DW)−1). It is possible that flash drying of isolated axes imposes a stasis on deteriorative reactions that does not occur during slower dehydration. Differential scanning calorimetry (DSC) of the axes indicated that the enthalpy of the melting and the amount of non-freezable water were similar, irrespective of the drying rate.Very immature axes that had completed morphogenesis and histodifferentiation only were more sensitive to desiccation (damage at 0.7 g H2O (g DW)−1) than mature axes or axes that were in the growth and reserve accumulation phase (damage at 0.4 g H2O (g DW)−1). As axes developed from maturity to germination, their threshold desiccation sensitivity increased to a higher level (1.3−1.4 g H2O (g DW)−1). For the very immature axes, enthalpy of the melting of tissue water was much lower, and the level of non-freezable water considerably higher, than for any other developmental stage studied.There were no marked correlations between desiccation sensitivity and thermal properties of water. Desiccation sensitivity appears to be related more to the degree of metabolic activity evidenced by ultrastructural characteristics than to the physical properties of water.

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