Nutrient Medium with Violuric Acid for Bacterial Diversity
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Solution Overview
Problem
Current nutrient media do not effectively support the simultaneous growth of a diverse range of bacteria, including both individual species and mixed communities, particularly 'not yet cultivated' bacteria, which limits the diversity of microorganisms that can be cultivated in a single medium.
Innovation Solution
A nutrient medium comprising pancreatic digest of casein, pepsin digest of meat, pancreatic digest of heart, yeast extract, starch, violuric acid, and beef infusion, with optional additions of agar-agar, horse blood serum, or erythrocytes, optimized to provide a broad spectrum of nutrients for bacterial growth, allowing for the cultivation of a maximum number of bacteria present in seed material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a general-purpose medium (Columbian medium) is used, then many species of microorganisms can grow, but the growth rate of individual bacteria and mixed communities is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the nutrient medium by adding violuric acid (0.001-0.05 wt%) and beef infusion (2.0-15 wt%), while adjusting the concentrations of existing components like pancreatic digest of casein (0.3-1.0 wt%), pepsin digest of meat (0.1-1.5 wt%), pancreatic digest of heart (0.1-0.9 wt%), yeast extract (0.1-2.0 wt%), and starch (0.3-0.8 wt%). These parameter changes enable the medium to support both high diversity and high growth rate of bacteria simultaneously.
2Productivity
If a selective medium is used to cultivate specific bacteria, then the growth rate of target bacteria improves, but the diversity of bacteria that can grow decreases
Solution Approach 1:
The patent creates a universal nutrient medium that serves multiple functions simultaneously: it supports the growth of diverse bacterial species (including 'not yet cultivated' bacteria), maintains high growth rates for individual species, and enables mixed community growth. The medium achieves this through a balanced composition containing violuric acid and beef infusion that provides broad-spectrum nutritional support without selective inhibition.
Data Source
AI summary
The invention relates to microbiology, and more particularly to nutrient media used for cultivating bacteria for the subsequent study thereof. A nutrient medium comprising a pancreatic digest of casein, a peptic digest of meat, a heart pancreatic digest, yeast extract, starch and water is characterized in that it additionally contains violuric acid and beef infusion, wherein the ratio of ingredients is (wt %): 0.3-1.0 pancreatic digest of casein; 0.1-1.5 peptic digest of meat; 0.1-0.9 heart pancreatic digest; 0.1-2.0 yeast extract, 0.3-0.8 starch; 0.001-0.05 violuric acid; 2.0-15 beef infusion; the remainder water. The nutrient medium can additionally contain 0.3-2.5 wt % agar-agar and/or 1-20 wt % whole or hemolyzed sheep red blood cells and/or 1-20 wt % whole or hemolyzed human red blood cells and/or 1-15 wt % horse blood serum. This provides for the simultaneous growth of the maximum possible number of bacteria present in an inoculate.