When I re-melt and stir 0.7% semi-solid media it incorporates a lot of bubbles and the media gets cloudy. It makes it difficult to see the results of phage titer experiments and may be disrupting them in general. Is there a way to remove bubbles without risking it solidifying during the process? Or prevent them from forming in the first place?
The problem of bubbles generally arises with re-melting of semi solid media.
The possible of dealing it would be to completely re-melt the media in a water bath made of glass beaker. While re-melting avoid constant shaking media vessel.
If the media is turning cloudy during melting, it might be an indicative of a probable contamination in media.
In high amount of solid fraction (0.7%) it is very difficult to attain the work in the semi-solid region. If you take my advice then the solid fraction should be less than 0.45% in order to study the semi-solid behavior of the material during casting. It has been observed that If solid fraction is about 0.45 or more then semi-solid temperature comes down below the eutectic temperature. Hence to work in the semi-solid state the solid fraction should be less than 0.45%.
You may want to check the following somewhat related discussion: https://www.researchgate.net/post/How_can_I_avoid_the_formation_of_air_bubbles_when_hydrogels_are_made_by_gamma_irradiation_technique
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