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Green tea-flavored yōkan, a popular Japanese red bean jelly made from agar A blood agar plate used to culture bacteria and diagnose infection. Agar (/ ˈ eɪ ɡ ɑːr / or / ˈ ɑː ɡ ər /), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from "ogonori" and "tengusa" (Gelidiaceae).
Contamination on an agar plate. An agar plate is a Petri dish that contains a growth medium solidified with agar, used to culture microorganisms. Sometimes selective compounds are added to influence growth, such as antibiotics. [1] 96 pinner used to perform spot assays with yeast, fungal or bacterial cells
Electroendosmosis is a reason agarose is used preferentially over agar as agaropectin in agar contains a significant amount of negatively charged sulphate and carboxyl groups. The removal of agaropectin in agarose substantially reduces the EEO, as well as reducing the non-specific adsorption of biomolecules to the gel matrix.
Following unsuccessful attempts of culturing microorganisms on gelatin mediums, Hesse then suggested that agar was preferable to gelatin for cultivating bacteria and other microorganisms. She was aware of the properties of agar as a gelling agent, able to maintain its physical properties at warm temperatures, through her usage of it at home.
To some, these facts may be pretty fascinating, but for most of us, that's just plain gross.
Compared to gelatin, agar preparations require a higher dissolving temperature, but the resulting gels congeal more quickly and remain solid at higher temperatures, 40 °C (104 °F), [14] as opposed to 15 °C (59 °F) [15] for gelatin. Vegans and vegetarians can use agar to replace animal-derived gelatin.
Gelatin is a main ingredient. Candies like Snickers, Skittles, Starbursts, and marshmallows have also fallen victim to the gelatin trap (I know, I'm crying too).
Gelatin is used as a binder in match heads [39] and sandpaper. [40] Cosmetics may contain a non-gelling variant of gelatin under the name hydrolyzed collagen (hydrolysate). Gelatin was first used as an external surface sizing for paper in 1337 and continued as a dominant sizing agent of all European papers through the mid-nineteenth century. [41]
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