Life in the Extreme: New Prokaryotes Living in High Temperature Low pH Environments

Sulfolobus acidocaldarius and Thermoplasma acidophilum prefer extreme living conditions of low pH (<3) and/or high temperature (>60°C) for optimal growth. To resist thermal denaturation of DNA it appears to be associated with helix stabilizing proteins.The chromosomal position of archaebacterial cells (the nucleoid) can be detected as ribosome-free space in which the DNA is located, as is shown by immunocytochemistry (fig. 1a,b). Similar to most eukaryotes the protein- DNA-ratio of their chromatin is relatively high (approx. 1:1 weight by weight), so that no aggregation occurs during dehydration for electron microscopy (fig. 2). Despite this aggregation-insensitivity, (2 and poster 1) the distribution of immunocytochemical label of the DNA bound proteins of Sulfolobus acidocaldarius (hsp's: A,B,C,C') is not exclusively connected with the bulk DNA of the nucleoid; only one of these proteins (C') seems to be associated with the bulk DNA.

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CARPENTER 20Mo-6

Alloy Digest ◽

10.31399/asm.ad.ss0444 ◽

1984 ◽

Vol 33 (5) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

High Temperature ◽

Field Tests ◽

Heat Treating ◽

Low Ph ◽

Good Resistance ◽

Cabot Corporation ◽

Temperature Performance ◽

Potential Applications

Abstract CARPENTER 20Mo-6 is an austenitic stainless steel which is resistant to corrosion in hot chloride environments with low pH. It has good resistance to pitting and stress-corrosion cracking in chloride environments and is also resistant to oxidizing media. Its good resistance to corrosion has been demonstrated in both laboratory and field tests. These tests indicate that potential applications for Carpenter 20Mo-6 include environments where HASTELLOY Alloy G (Cabot Corporation) is acceptable. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-444. Producer or source: Carpenter.

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Sulfolobus: A new genus of sulfur-oxidizing bacteria living at low pH and high temperature

Archives of Microbiology ◽

10.1007/bf00408082 ◽

1972 ◽

Vol 84 (1) ◽

pp. 54-68 ◽

Cited By ~ 547

Author(s):

Thomas D. Brock ◽

Katherine M. Brock ◽

Robert T. Belly ◽

Richard L. Weiss

Keyword(s):

High Temperature ◽

New Genus ◽

Low Ph ◽

Sulfur Oxidizing ◽

Sulfur Oxidizing Bacteria

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Acidizing of High Temperature and Highly Sensitive Multilayered Carbonate Well with Aminopolycarboxylic Acid Low-pH Fluid: Field Implementation and Laboratory Validation

10.2118/175839-ms ◽

2015 ◽

Cited By ~ 2

Author(s):

Enrique A. Reyes ◽

Keith Rispler ◽

John Davis ◽

Russell Stimatze ◽

Martial Ouedraogo ◽

...

Keyword(s):

High Temperature ◽

Low Ph ◽

Fluid Field ◽

Highly Sensitive ◽

Aminopolycarboxylic Acid

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The development and applications of sucralose, a new high-intensity sweetener

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y94-063 ◽

1994 ◽

Vol 72 (4) ◽

pp. 435-439 ◽

Cited By ~ 45

Author(s):

I. Knight

Keyword(s):

High Temperature ◽

Research Program ◽

Collaborative Research ◽

Low Ph ◽

Hydroxyl Groups ◽

Safety Testing ◽

Food And Beverage ◽

Selective Substitution ◽

The University ◽

Exceptional Stability

Sucralose is a new sweetener discovered during a collaborative research program between Tate &Lyle and Queen Elizabeth College of the University of London. It is made by selective substitution of sucrose hydroxyl groups by chlorine, resulting in a highly intense (600×) sugarlike sweetness and exceptional stability at both high temperature and low pH. The research leading to the discovery of sweetness in differently halogenated sucrose is described, as well as the development of sucralose and the process of safety testing and government approval. Finally, sucralose properties and applications in Canada's food and beverage industries are discussed.Key words: sucralose, sweetener, stability, halogen, chlorine.

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Influence of the Ti precursor on the properties of Ti–pillared smectites

Clay Minerals ◽

10.1180/000985501547295 ◽

2001 ◽

Vol 36 (1) ◽

pp. 125-138 ◽

Cited By ~ 19

Author(s):

M. A. Vicente ◽

M. A. Bañares-Muñoz ◽

R. Toranzo ◽

L. M. Gandía ◽

A. Gil

Keyword(s):

Acetic Acid ◽

High Temperature ◽

Titanium Tetrachloride ◽

High Specific Surface Area ◽

Complete Characterization ◽

Low Ph ◽

Titanium Tetraisopropoxide ◽

Acid Attack ◽

Octahedral Sheet

AbstractThe pillaring of smectites (two saponites and a montmorillonite) with various Ti precursors was studied. The minerals were intercalated with ‘classical ’ Ti precursors, such as titanium tetrachloride and titanium tetraethoxide, and also with new precursors, such as solutions of titanium tetraisopropoxide in acetic acid, or titanium (bis (ethylacetoacetato) diisopropoxide) in acetone. A complete characterization of the intercalated solids was carried out and a comparison of the properties of the solids as a function of the precursors used in the intercalation established. The influence of the severe conditions in which the intercalation with Ti oligomers is usually carried out (low pH and/or high temperature) on the properties of the intercalated solids was analysed. Intercalation with TiCl4 and Ti(EtO)4 strongly affected the structure of the clays, not by acid attack on the octahedral sheet, but mainly by disaggregation of particles. Ti(isop)4 was found to be less aggressive for the clays, while Ti(etacet)2(isop)2 did not form pillared solids but organo-clays, and therefore was of no use as a pillaring agent. The solids were thermally stable up to 300°C, showing a high specific surface area.

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