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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

Flotation modifiers include several classes of chemicals as described below.... Alkalinity regulators such as lime, caustic soda, soda ash, and sulfuric acid are used to control or adjust pH, a very critical factor in many flotation separations.  1, record 1, English, - alkalinity%20regulator

Record number: 1, Textual support number: 1 OBS

pH regulators: Substances used in flotation processes to control the hydrogen-ion concentration.  3, record 1, English, - alkalinity%20regulator

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Réactif utilisé pour amener le pH de la pulpe à une valeur choisie.  3, record 1, French, - r%C3%A9gulateur%20de%20pH

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

Type of chromatography developed following the observation that certain proteins were unexpectedly retained on affinity gels containing hydrophobic spacer arms. This concept was extended, and families of hydrophobic adsorbents prepared using a homologous series of hydrocarbon chains of different lengths. In practice most proteins can be satisfactorily purified using C-8 or phenyl substituents. Hydrophobic interactions are strongest at high ionic strength, so adsorption to a hydrophobic matrix can be conveniently performed after a salt precipitation or ion exchange chromatography step. Elution can be effected by altering the solvent ionic strength, pH, or composition or by the use of a dielectric constant modifier such as ethanediol.  2, record 2, English, - hydrophobic%20chromatography

Record number: 2, Textual support number: 1 CONT

When carrying out the hydrophobic chromatography of human urokinase..., the solution containing the crude urokinase which is prepared from human urine in the usual simple method, is adjusted to a salt concentration of 0. 2 to 2 M, preferably 0. 2 to 1 M. The solution is then made to flow through the hydrophobic column packed with the protein adsorbent of this process.... The pH is not critical when carrying out the hydrophobic chromatography, however, the pH is usually adjusted to pH 5. 5 to 10, preferably 6 to 8. 5 at which pH urokinase is stable against inactivation. Purified urokinase can be obtained by treating the effluent from the hydrophobic column in a usual method, namely by lyophilization after desalting.  3, record 2, English, - hydrophobic%20chromatography

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Certaines observations faites en chromatographie d'affinité ont montré que divers effets non spécifiques étaient attribuables à des interactions de type hydrophobe. De là est venue l'idée d'employer des chaînes carbonées fixées à un support d'agarose. On dispose maintenant de familles de composés, ne différant entre eux que par de minimes variantes de structure, mais présentant des propriétés chromatographiques intéressantes. Diverses protéines se fixent réversiblement et selon des modalités variées à ces chaînes hydrophobes : c'est donc une possibilité de séparation. Cette chromatographie "hydrophobe" est actuellement en expansion.  2, record 2, French, - chromatographie%20hydrophobe

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

The most recent(1975 to 1979) New York State Department of Environmental Conservation surveys indicate that 25% of the lakes(comprising about 5% of the sampled waters) were at a "critical" pH level below 5. 0. Overall, 7. 9% of the lakes in the Adirondacks were acidified from acid precipitation(228 lakes), totalling 3. 9% of the water acreages.  2, record 3, English, - critical%20pH

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

pH critique : déterminé à partir du moment où cesse la reproduction selon les espèces.  3, record 3, French, - pH%20critique

Record number: 3, Textual support number: 1 OBS

Critique : Qualifie le point, l'état où un seuil est atteint.  4, record 3, French, - pH%20critique

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

In most metallic [solar collector] systems, especially those using a number of metals or a reactive metal such as aluminum, the heat transfer fluid can have a significant impact on corrosion. In aqueous solutions, the concentration of dissolved chemicals, heavy metal ions, and pH of the fluid must be controlled. Deionized or demineralized water has been used successfully but additional steps are usually taken. These include the use of a gettering column to trap heavy metal ions before they enter critical parts of the system and inhibitors which stabilize the metal ions and reduce their reaction with less noble metals.  1, record 4, English, - gettering%20column

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

While much emphasis has been placed on reducing sulphur dioxide emissions, NOx emissions must also viewed with concern due to their contribution to the pH depression associated with the snowpack melt episodes. This depression, when imposed on the surface waters where the acidity has already been increased due to excess sulphates, results in levels of acidity that may be critical and occur at sensitive life stages of many aquatic organisms, even though the long-term average acidity may be tolerated by a normal biological habitat.  1, record 5, English, - long%2Dterm%20average%20acidity

Record 5,  Textual support,  French

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

The most recent(1975 to 1979)... surveys indicate that 25% of the lakes(comprising about 5% of the sampled waters) were at a "critical" pH level, below 5. 0.  1, record 6, English, - critical%20pH%20level

Record 6,  Textual support,  French

Record 6,  Textual support,  Spanish