They have different gelling powers. Agar can form gels at concentrations much lower than 1.0% (even at 0.1%), it has a gelling power between five and eight times greater than the rest of hydrocolloids, so much less product is required to produce the same effect. Each of them results in different textures. Agar always results in strong, brittle
Preparation of Chocolate Agar. Prepare the blood agar base as instructed by the manufacturer. Sterilize by autoclaving at 121°C for 15 minutes. Add 5-7% v/v of defibrinated blood (horse or sheep blood). Then place the media in a water bath of 75 -80°C. Keep swirling gently until the color changes to dark brown. Agar is a complex mixture of polysaccharides, whereas agarose is a purified form of agar. Agar is commonly used as a solidifying agent in culture media, while agarose is primarily used in gel electrophoresis for separating DNA fragments. Agarose has a higher gel strength and better resolution, making it ideal for DNA analysis, while agar is
All Answers (5) Aspergillus candidus, A. niger, A.sulphureus, A. versicolor, Penicillium corylophilum, P. expansum,Fusarium oxysporum grows on PDA. Most fungi will be able to grow on Potato
SEAWEEDS USED AS A SOURCE OF AGAR. 2. SEAWEEDS USED AS A SOURCE OF AGAR. Most agar is extracted from species of (Figure 1) and (Figure 2). Closely related to are species of Pterocladia, and small quantities of these are collected, mainly in the Azores (Portugal) and New Zealand. Gelidiella acerosa is the main source of agar in India. Meningococci produce large colonies on chocolate agar. Blood is inoculated immediately into blood culture bottles containing glucose broth or sodium taurocholate broth and incubated at 35–36 °C. Sub-cultures are made on blood agar or chocolate agar from these broths and are pre-incubated overnight at 35–36 °C in the presence of 5% CO 2 Blood Agar. Blood agar is almost identical to nutrient agar except that it contains five to ten percent sheep, rabbit, or horse blood. Blood agar consists of: Beef extract, for nitrogen. Blood, for nitrogen, amino acids, and carbon. Sodium chloride, for maintaining osmotic balance. Agar, for the solidifying agent.
There is only two difference between both. 1. Agar is solidified media while broth is liquid media. 2. Agar is used for the Isolation and preservation of bacterial culture while N. broth is used
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    • difference between agar and agar agar