biology

Photobacterium marinum

Photobacterium marinum is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Photobacterium marinum rather than just read about it. In short: Photobacterium marinum is a gram-negative, oxidase and catalase positive, motile bacteria of the genus Photobacterium. Photobacterium marinum are commonly found in marine environment.

Key takeaways

Photobacterium marinum belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Photobacterium marinum to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Photobacterium marinum from memory before moving on to harder problems.

Reference excerpt

Photobacterium marinum is a gram-negative, oxidase and catalase positive, motile bacteria of the genus Photobacterium. Photobacterium marinum are commonly found in marine environment. S.I. Paul et al. (2021) isolated, characterized and identified Photobacterium marinum from marine sponges of the Saint Martin's Island Area of the Bay of Bengal, Bangladesh.

Biochemical characteristics of Photobacterium marinum P. marinum has an optimum growth temperature of 30 °C. Cells contain poly-β-hydroxybutyrate granules that are visible with transmission electron microscopy. Similar to other members of the genus, P. marinum is oxidase positive and catalase positive.

Colony, morphological, physiological, and biochemical characteristics of Photobacterium marinum are shown in the Table below.

Note: + = Positive; – =Negative; V =Variable (+/–)

References

Worked examples

Example 1 — a first encounter with Photobacterium marinum

Start with the simplest possible case. Write down what Photobacterium marinum claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Photobacterium marinum before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Photobacterium marinum ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Photobacterium marinum

In research: Photobacterium marinum appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Photobacterium marinum in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Photobacterium marinum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteria described in 2013, Gram-negative bacteria, Marine microorganisms, so understanding it makes those chapters shorter.
In everyday life: Look for Photobacterium marinum outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Photobacterium marinum in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Photobacterium marinum means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Photobacterium marinum out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Photobacterium marinum in simple terms?

Photobacterium marinum is a gram-negative, oxidase and catalase positive, motile bacteria of the genus Photobacterium. Photobacterium marinum are commonly found in marine environment.

Why does Photobacterium marinum matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Photobacterium marinum?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Photobacterium marinum.