# Durham tube
**Wikidata**: [Q4115471](https://www.wikidata.org/wiki/Q4115471)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Durham_tube)  
**Source**: https://4ort.xyz/entity/durham-tube

## Summary
The Durham tube is a specific instance of a growth medium, which is a liquid or gel substance designed to support the cultivation of microorganisms, cells, or tissues in a controlled laboratory environment. By providing essential nutrients, moisture, and physical support, it facilitates scientific research, medical diagnostics, and industrial biotechnology applications.

## Key Facts
*   **Classification**: Identified as an instance of a "growth medium."
*   **Aliases**: Also known as "Cloche (Milieu De Culture)" and "ダーラム管" (Japanese).
*   **Identifiers**:
    *   Freebase ID: `/m/02rrkf` and `/m/0130rkb6`
    *   Microsoft Academic ID: `59958947` (discontinued)
*   **Global Presence**: Has sitelinks across 7 Wikipedia languages (Arabic, English, French, Indonesian, Japanese, Polish, Tamil).
*   **Forms**: Exists as liquid (broths) or gel (solidified with agents like agar).
*   **Components**: Composed of nutrients, salts, carbohydrates, and growth factors.
*   **Class Identifiers**: Belongs to the class "growth medium" (MeSH Descriptor ID D003470, UMLS CUI C0010454, Agrovoc ID c_10204).

## FAQs
### What is a Durham tube used for?
A Durham tube is a growth medium used to cultivate microorganisms or cells by providing a sterile environment with necessary nutrients, moisture, and physical support. It allows researchers to isolate pathogens, study microbial genetics, and conduct medical diagnostics.

### What are the different forms of this growth medium?
Like other growth media in its class, it is available in liquid forms (broths) for fermentative growth and solid gel forms (often using agar) to provide structural support for colony formation.

### Is the Durham tube related to specific diagnostic history?
As a member of the growth medium class, it shares a historical context with significant developments like the Ogawa medium (1949), which revolutionized tuberculosis diagnosis through standardized cultivation.

## Why It Matters
The Durham tube, as a growth medium, is a foundational element in biology and medicine. It enables the cultivation of organisms and cells that would otherwise be impossible to study in natural environments. This capability is critical for isolating pathogens for diagnosis, growing cell lines for drug testing, and producing vaccines or bioproducts at scale. By allowing customizable conditions—such as nutrient composition or antibiotic resistance—it facilitates breakthroughs in genetics, microbiology, and regenerative medicine, directly contributing to public health and industrial innovation.

## Notable For
*   **Customizability**: Formulated for specific tasks, such as distinguishing bacterial species (differential media) or supporting specific mammalian cell growth.
*   **Versatility**: Applied across diverse disciplines, from environmental science (soil extract media) to pharmaceuticals (large-scale bioreactors).
*   **Standardization**: As part of the chemically defined media category, it ensures reproducibility in experiments, which is critical for scientific rigor.
*   **Historical Context**: Part of a class of tools pivotal to medical advancements, such as the diagnosis of tuberculosis.

## Body
### Definition and Classification
The Durham tube is classified as an instance of a **growth medium**. A growth medium is a sterile formulation—either liquid or gel—designed to support the growth of microorganisms, cells, or tissues. Its primary role is to mimic natural environments while allowing controlled manipulation of variables such as nutrient availability, moisture, and pH.

### Physical Forms and Composition
Growth media like the Durham tube are available in two primary states:
*   **Liquid (Broths)**: Used for fermentative growth and liquid cultures (e.g., Trypticase soy broth).
*   **Gel (Solid)**: Solidified with gelling agents like agar to provide structural support for colony formation on plates.

The composition typically includes:
*   **Nutrients and Salts**: Essential for basic metabolic function.
*   **Carbohydrates**: Energy sources for the organisms.
*   **Growth Factors**: Supplements required for specific fastidious organisms.
*   **Supplements**: Serum, amino acids, or antibiotics may be added to support or select for specific growth.

### Types of Media
The class of growth media encompasses several types, which define the potential applications and nature of the Durham tube:
*   **Chemically Defined Media**: All components are known and synthesized (e.g., Eagle's minimal essential medium) to ensure consistency.
*   **Selective Media**: Contains inhibitors like antibiotics to suppress unwanted organisms while allowing target species to grow (e.g., Mueller-Hinton agar).
*   **Enrichment Media**: Boosts the growth of specific organisms to isolate pathogens from mixed samples.
*   **Serum-Free Media**: Reduces variability and ethical concerns by avoiding animal-derived serum.

### Identification and Data
The entity "Durham tube" is distinguished by specific identifiers and multilingual presence:
*   **Aliases**: Referred to as *Cloche (Milieu De Culture)* in French contexts and *ダーラム管* in Japanese.
*   **Database IDs**: Linked to Freebase IDs `/m/02rrkf` and `/m/0130rkb6`, and Microsoft Academic ID `59958947`.
*   **Wikipedia Presence**: The topic has sitelinks in 7 languages: Arabic (ar), English (en), French (fr), Indonesian (id), Japanese (ja), Polish (pl), and Tamil (ta).
*   **Class Identifiers**: The broader class "growth medium" is tracked under MeSH Descriptor ID D003470, UMLS CUI C0010454, and Agrovoc ID c_10204.

### Applications
The utilization of growth media extends across three major sectors:
1.  **Research**: Essential for studying microbial genetics, cell signaling, and disease mechanisms.
2.  **Medicine**: Used in diagnostic laboratories to culture pathogens from patient samples.
3.  **Industry**: Supports the large-scale production of vaccines, enzymes, and biofuels within bioreactors.

### Historical Context
The development of standardized media represents a critical advancement in public health. Historical examples, such as the **Ogawa medium** developed in 1949 for tuberculosis diagnosis, illustrate the role of growth media in revolutionizing medical diagnostics. Innovations in media formulation continue to address modern challenges, including antibiotic resistance and the sustainability of cell culture methods.

## References

1. Freebase Data Dumps. 2013