Physicochemical changes during

ZDDP, the antiwear film formation requires that a chemical reaction occurs between the additive and the metallic surface. In the case of hard-core RMs, the mineral material CaC03 is directly introduced in the sliding contact and undergoes small physicochemical changes during the film build-up. Consequently no chemical reaction with the substrate surfaces is required. 

The effectiveness of the different salts in promoting the various physicochemical changes during processing, summarized in Table XII, are discussed below. 

Offers an in-depth analysis of how chemical reactivity changes during different physicochemical processes or in the presence of external perturbations... 

As mentioned above, Foodomics tools also offer enormous potential to study the molecular basis of biological processes with agronomic interest and economic relevance, such as the interaction between crops and its pathogens, as well as physicochemical changes that take place during fruit ripening. 

Lai, L.S. and Kokini, J.L. (1991). Physicochemical changes and rheological properties of starch during extrusion. Biotechnol. Prog., 7,251 266. 

Lapteva E.S., Yusupov T.S., Berger A.S., Physicochemical Changes of Layered Silicates during Mechanical Activation. Novosibirsk Nauka, 1981. 

Photochromism has many potential and existing applications that take advantage of a change in colour or other physicochemical properties during the process, for example variable-transmission optical materials such as photochromic eyeglass or ophthalmic lenses that darken in sunlight (using spiropyran and spirooxazine systems in addition to... 

Changes in physicochemical properties of the drug substance (e.g., color, crystal modification) may take place upon irradiation. Efforts should be made to observe such changes during the in vitro assay. The sample absorption spectrum should be recorded before and after irradiation surface color of solid samples should be evaluated by appropriate methods and the identity of the sample crystal modification should be confirmed when the drug is irradiated in the solid state. The humidity in the test chamber can influence the photochemical stability of certain solid samples, as demonstrated for mefloquine. The photoinduced yellowing of uncoated mefloquine tablets is accelerated by an increase in humidity. These tablets are mainly used in tropical countries and the real in-use conditions will include high relative humidity. In such cases, the influence of the humidity on the photostability must be taken into account (Tpnnesen et al., 1997). 

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