description | positive staining | negative staining
appearance of cell | |
representative image of staining | |
background appearance | |
examples of dyes used in technique | |

terms and images:
methylene blue, nigrosin, not stained, india ink, stained black/dark, colored by dye, crystal violet, clear/colorless

Question

terms and images:
methylene blue, nigrosin, not stained, india ink, stained black/dark, colored by dye, crystal violet, clear/colorless

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "table_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [], "new_concepts": [ "Positive Staining", "Negative Staining", "Bacterial Staining Techniques" ], "current_concepts": [ "Positive Staining", "Negative Staining", "Bacterial Staining Techniques" ] } ## Classify cell and background appearance $$ \begin{aligned} &\text{Positive Staining: Cell is colored by dye, Background is clear/colorless} \ &\text{Negative Staining: Cell is not stained (clear/colorless), Background is stained black/dark} \end{aligned} $$ ## Match representative images $$ \begin{aligned} &\text{Positive Staining Image: Blue stained cells on a clear background (left circular image)} \ &\text{Negative Staining Image: Clear cells on a dark background (right circular image)} \end{aligned} $$ ## Assign example dyes $$ \begin{aligned} &\text{Positive Staining Dyes: methylene blue, crystal violet} \ &\text{Negative Staining Dyes: nigrosin, india ink} \end{aligned} $$ | Description | Positive Staining | Negative Staining | |---|---|---| | **Appearance of Cell** | colored by dye | not stained | | **Representative Image of Staining** | Blue cells on clear background (left image) | Clear cells on dark background (right image) | | **Background Appearance** | clear/colorless | stained black/dark | | **Examples of Dyes Used in Technique** | methylene blue, crystal violet | nigrosin, india ink | { "subject": "Natural Science", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Natural Science", "Microbiology", "Bacterial Staining Techniques" ] }

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QUESTION IMAGE

Question

Explanation:

Classify cell and background appearance

Match representative images

Assign example dyes

Answer:

Description	Positive Staining	Negative Staining
Representative Image of Staining	Blue cells on clear background (left image)	Clear cells on dark background (right image)
Background Appearance	clear/colorless	stained black/dark
Examples of Dyes Used in Technique	methylene blue, crystal violet	nigrosin, india ink