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Negative stain

negative stain

(Science: technique) stain forming an opaque or coloured background against which the object to be demonstrated appears as a translucent or colourless area; in electron microscopy, an electron opaque material, such as phosphotungstic acid or sodium phosphotungstate, is used to give detail as to surface structure.

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identify bacterias in Gram stain kit &The Giemsa Stain Kit

The Gram Stain Kit is intended for the demonstration and differentiation of Gram-positive and Gram-negative bacteria. Gram Positive Bacteria: Blue Gram Negative Bacteria: Red Other Tissue: Yellow Nuclei: Red The ...

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by scytek
Sat Mar 15, 2014 1:11 pm
Forum: General Discussion
Topic: identify bacterias in Gram stain kit &The Giemsa Stain Kit
Replies: 0
Views: 1416

Bacterial Taxonomy

... more such charts. I would particularly like a chart that relates Gram-staining to taxonomy, one that makes note of all the common exceptions. Maybe ... like? Deinococcus has an outer membrane similar to that of Gram-negatives, but it stains as Gram-positive, so it somehow retains the crystal ...

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by wildfunguy
Sat Oct 19, 2013 6:12 pm
Forum: Microbiology
Topic: Bacterial Taxonomy
Replies: 3
Views: 4311

Gram Positive Cocci

... far: Colony morphology: Yellow, round, slightly concave, smooth. Gram stain: Gram positive, appears to be cocci, but not perfectly round and tend ... mean that it ferments sucrose instead of lactose?) Nitrate Reduction: Negative (does not break down NO) Catalase: Positive Based on the first dichotomous ...

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by lucrezia03
Wed Oct 17, 2012 11:58 pm
Forum: Microbiology
Topic: Gram Positive Cocci
Replies: 2
Views: 4115

gram negative cocci. please help

You said you did an ACID FAST test to show you if it was GRAM NEGATIVE? Did you do a Gram stain at all? An acid-fast test doesn't tell you if it's Gram negative or Gram positive. Rather, ...

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by keetner
Mon Oct 08, 2012 12:23 am
Forum: Microbiology
Topic: gram negative cocci. please help
Replies: 8
Views: 9416

Unknown Organism

... help identifying my unknown by Monday. Here are the results. 1. Gram Stain Positive (Clustered Bacilli) 2. Capsule Negative 3. Endospore Negative* 4. Phenol Red Broth Fermentation with Acid and Gas end products ...

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by CheriPeace
Fri Jun 29, 2012 9:08 pm
Forum: Microbiology
Topic: Unknown Organism
Replies: 5
Views: 4852
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