What does nutrient agar mean?

Definitions for nutrient agar
nu·tri·ent agar

This dictionary definitions page includes all the possible meanings, example usage and translations of the word nutrient agar.

Princeton's WordNet

  1. agar, nutrient agarnoun

    any culture medium that uses agar as the gelling agent


  1. Nutrient agar

    Nutrient agar is a general purpose liquid medium supporting growth of a wide range of non-fastidious organisms. It typically contains (mass/volume): 0.5% peptone - this provides organic nitrogen 0.3% beef extract/yeast extract - the water-soluble content of these contribute vitamins, carbohydrates, nitrogen, and salts 1.5% agar - this gives the mixture solidity 0.5% sodium chloride - this gives the mixture proportions similar to those found in the cytoplasm of most organisms distilled water - water serves as a transport medium for the agar's various substances pH adjusted to neutral (6.8) at 25 °C (77 °F).Nutrient broth has the same composition,but lacks agar.These ingredients are combined and boiled for approximately one minute to ensure they are mixed and then sterilized by autoclaving, typically at 121 °C (250 °F) for 15 minutes. Then they are cooled to around 50 °C (122 °F) and poured into Petri dishes which are covered immediately. Once the dishes hold solidified agar, they are stored upside down and are often refrigerated until used. Inoculation takes place on warm dishes rather than cool ones: if refrigerated for storage, the dishes must be rewarmed to room temperature prior to inoculation.


  1. nutrient agar

    Nutrient agar is a general-purpose medium used to cultivate a wide variety of non-fastidious microorganisms such as bacteria and fungi. It typically contains a mixture of protein sources, sugars, salts, and agar, a gelatin-like substance extracted from seaweed. Nutrient agar serves as a solid substrate for microbial growth, providing essential nutrients, a suitable pH level, and a stable moist environment. It is widely used in scientific research, clinical diagnostics, and food/water quality testing.


  1. Nutrient agar

    Nutrient agar is a microbiological growth medium commonly used for the routine cultivation of non-fastidious bacteria. It is useful because it remains solid even at relatively high temperatures. Also, bacteria grown in nutrient agar grows on the surface, and is clearly visible as small colonies. In nutrient broth, the bacteria grows in the liquid, and is seen as a soupy substance, not as clearly distinguishable clumps. Nutrient agar typically contains: ⁕0.5 % Peptone ⁕0.3 % beef extract/yeast extract ⁕1.5 % agar ⁕0.5% NaCl distilled water ⁕pH adjusted to neutral at 25 °C. Nutrient broth is made identically, except omitting the agar. Composition Ingredients Gms / Litre Peptic digest of animal tissue 5.000 Sodium chloride 5.000 Beef extract 1.500 Yeast extract 1.500 Agar 15.000 Final pH 7.4±0.2 Formula adjusted, standardized to suit performance parameters Directions Suspend 28 grams in 1000 ml distilled water. Heat to boiling to dissolve the medium completely. Dispense as desired and sterilize by autoclaving at 15 lbs pressure for 15 minutes. Mix well before pouring. Principle And Interpretation Nutrient media are basic culture media used for maintaining microorganisms, cultivating fastidious organisms by enriching with serum or blood and are also used for purity checking prior to biochemical or serological testing. Nutrient Agar is ideal for demonstration and teaching purposes where a more prolonged survival of cultures at ambient temperature is often required without risk of overgrowth that can occur with more nutritious substrate. This relatively simple formula has been retained and is still widely used in the microbiological examination of variety of materials and is also recommended by standard methods. It is one of the several non-selective media useful in routine cultivation of microorganisms. It can be used for the cultivation and enumeration of bacteria which are not particularly fastidious. Addition of different biological fluids such as horse or sheep blood, serum, egg yolk etc. makes it suitable for the cultivation of related fastidious organisms. Peptic digest of animal tissue, beef extract and yeast extract provide the necessary nitrogen compounds, carbon, vitamins and also some trace ingredients necessary for the growth of bacteria. Sodium chloride maintains the osmotic equilibrium of the medium.

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  1. Chaldean Numerology

    The numerical value of nutrient agar in Chaldean Numerology is: 3

  2. Pythagorean Numerology

    The numerical value of nutrient agar in Pythagorean Numerology is: 4

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