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Showing 1 to 20 of 45 for “"Freezing Point"”.
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A freezing point apparatus
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1939.
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Lactose Hydrolysis by Fungal and Yeast Lactase: Influence on Freezing Point and Dipping Characteristics of Ice Cream
… to examine the effects of lactose hydrolysis on freezing point and dipping characteristics of ice cream. The overall research objective was to determine changes in freezing point, texture and ease of dipping ice cream as a result of lactose hydrolysis. It was also the goal of this research to …
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Behavioral freeze avoidance in an Antarctic fish
… Southern Ocean. Most notothenioids avoid freezing primarily by the action of their blood-borne antifreeze glycoproteins (AFGPs). AFGPs arrest the growth of environmental ice crystals that enter the fish, thereby preserving the body fluids in liquid state. AFGPs are ubiquitous in all adult …
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DESIGN, SYNTHESIS, AND CHARACTERIZATION OF INDANE 2,5-DIKETOPIPERAZINES FOR LIQUID CRYSTAL APPLICATIONS
… DKPs showed a remarkable trend in freezing point. The freezing point for the series decreases with an increase in alkyl chain length. To understand the relationship between the crystal packing interactions and the freezing point trend, a study of the association of DKPs in solution …
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Kinetics and Mechanism of Syn, Alpha' Lithiation of Tertiary Benzamides
… obtained by nuclear magnetic reso- nance, freezing point depression and stopped-flow infrared spectros- copy indicates the reaction proceeds with rapid initial formation of tetrameric complexes followed by rate determining deprotonation. Model studies using …
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Condensation and Freezing Front Propagation on Surfaces With Topographic and Chemical Modifications
… data on propagation were reported for a freezing front crossing on micro-grooved substrates in a 200mum-to-400mum-thick water layer. The speed of a freezing front oscillates locally over the grooves, with propagation retarded in troughs and accelerated on crests. When the water freezing …
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Effect of environmental temperature on Antarctic fish antifreeze protein activity and concentration
… the western Antarctic Peninsula (WAP) experience freezing sea surface water temperatures and ice formation only during the austral winter but the water below 100 m is warmer due to the effects of the Circumpolar Deep Water (CDW) that flows onto the shelf. During the winter the temperature gradient …
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Exploring transport and phase behavior in nanoporous carbon materials
… presented for predicting the diameter-dependent freezing point changes. This work also demonstrates the use of patch clamp for generating and studying soft polymer-based nanopores.
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Pulsed neutron measurements of the diffusion parameters of heavy and light water mixtures at several temperatures
… technique at room temperature (21°C), near the freezing point of the mixture in the liquid state, and at -20°C in the solid state (ice). A 250-kv pulsed Cockcroft-Walton accelerator, using neutrons from the ₁H²(d,n)₂He³ reaction, was used to generate fast neutrons bursts. The values of the …
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The Reaction of Ethylenediamine with Cobalt (II) Perchlorate and Oxygen in Dilute Aqueous Solutions
… conductometric, magnetic susceptibility, freezing point depression, electron spin resonance and cobalt (II) extraction methods. The fact that the complex was brown in color, diamagnetic, contained ethylenediamine to cobalt to oxygen in a mole ratio of 4:2:1 was confirmed. The complex …
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The influence of environmental temperature on the thermal tolerance of Antarctic notothenioid fishes
… are largely split between the constantly freezing High-Antarctic Zone (HAZ) and the more thermally variable Seasonal pack-Ice Zone (SPZ). For these fishes, the lower boundary of their thermal tolerance is effectively determined by their capacity for freeze avoidance and limited by their …
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The economics of sugar hydrogenloysis for the commercial production of an automotive antifreeze
… antifreeze was tested. AB far as viscosity and freezing point depression were concerned, such an automotive antifreeze compares favorably with ethylene glycol. The economics of the process were studied, and a tentative plant was designed to produce 3000 tons per year which would require a …
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Multiscale modeling of transport mechanisms and quality changes in frozen foods during freeze-thaw cycles
The freezing process is commonly used to store and preserve foods. However, the frozen foods’ texture and taste are harmed by the temperature fluctuations during shipping and storage. The insights into the mechanisms of heat transfer, moisture migration, ice crystallization and solute diffusion are …
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Antifreeze Glycopeptides of Antarctic Fish: Comparative Aspects of Their Biochemistry and Physiology
… colligative properties would dicate to be the freezing point of their blood. AFGPs are well-characterized from two antarctic species, Pagothenia borchgrevinki and Dissostichus mawsoni. Eight other species of antarctic fish were examined for AFGPs, and results showed a high degree of similarity …
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"Characterization of an antifreeze glycopeptide gene from the Antarctic cod, Notothenia neglecta, and a functional study of the ""pre-"" sequence of this antifreeze glycopeptide"
… glycopeptides (AFGP 1 to 8) which lower the freezing point of its body fluids below that of sea water. I report here the sequence of one of its AFGP genes. The structural gene contains 46 tandemly repeated segments, each coding for one mature peptide. Most of the repeats (44) are composed of …
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Kinetics and Mechanism of the Catalysis of the Decomposition of Hydrogen Peroxide by Schiff Base Complexes of Copper(II).
… complexes, in aqueous ethanol solvent. Freezing point depression and vapor pressure lowering studies were carried out to confirm the dimeric nature of the [CuSALAD]<sub>2</sub>.H<sub>2</sub>O complex that had been previously reported. The stoichiometry of the …
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Energy and water balance in the lesser double-collared sunbird, Nectarinia chalybea
… feeding on fish or invertebrates just above freezing point. The evaporative water loss (and therefore evaporative heat loss) of N. chalybea increased as dietary sucrose concentration decreased (more than two-fold between 1.2 and 0.2 M).
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Energy and water balance in the lesser double-collared sunbird, Nectarinia chalybea
… feeding on fish or invertebrates just above freezing point. The evaporative water loss (and therefore evaporative heat loss) of N. chalybea increased as dietary sucrose concentration decreased (more than two-fold between 1.2 and 0.2 M).
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Climate system response to perturbations : role of ocean and sea ice
… whole water column needing to be cooled to the freezing point before sea ice develops at the surface. The third part investigates biogeochemical interactions between oceans and sea ice around Antarctica. During the glacial cycles of the Pleistocene, sea ice may have helped trap carbon in the …
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Evaluation of the Impact of Anti-Icing Solution on Concrete Durability
… surface of the pavement in order to lower the freezing point and break the bond of snow and ice to improve traction and safety. Conventional winter maintenance involves applying solid salt (rock salt) to the pavement prior to and during snow events. However, this conventional winter pavement …
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