biology

Pyrococcus

Pyrococcus 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 Pyrococcus rather than just read about it. In short: Pyrococcus is a genus of Thermococcaceaen archaeans. Description and significance Pyrococcus has similar characteristics of other thermoautotrophican archaea such as Archaeoglobus, and Methanococcus in the respect that they are all thermophilic and anaerobic.

Key takeaways

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

Reference excerpt

Pyrococcus is a genus of Thermococcaceaen archaeans.

Description and significance Pyrococcus has similar characteristics of other thermoautotrophican archaea such as Archaeoglobus, and Methanococcus in the respect that they are all thermophilic and anaerobic. Pyrococcus differs, however, because its optimal growth temperature is nearly 100 °C and dwells at a greater sea depth than the other archaea. Studying Pyrococcus helps give insight to possible mechanisms used to endure extreme environmental conditions like high temperatures and high pressure.

Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI).

Genome structure Three of the Pyrococcus species have been sequenced. P. furiosus is the largest containing 1.9 Mb followed by P. abyssi with 1.8 Mb and P. horikoshii with 1.7 Mb. The genomes encode for many different metabolic enzymes which gives themselves a wider spectrum of living conditions because they can transport and metabolize a wide range of organic substances. Variation was detected between species as well.

Cell structure and metabolism The cells of Pyrococcus are about 0.8–2 μm and are slightly irregular cocci in shape. They show a polar grouping of flagella and are enveloped by an S-layer enclosing a periplasmic space around the cytoplasmic membrane. Pyrococcus species are anaerobic but vary slightly concerning their metabolism. Peptide fermentation is the principle metabolic pathway; however, growth has been observed for P. furiosus and P. abyssi on starch, maltose, and pyruvate, but not for P. horikoshii. While the presence of elemental sulfur is not needed for growth, growth is enhanced with the addition of So.

Ecology Pyrococcus species inhabit environments with extremely high temperatures such as hydrothermal vents. Optimal growth conditions include a pH level of about 7, a salt concentration around 2.5% (25 g/L), and a temperature around 98 °C. Growing in temperatures this high, it is easy to see why they are anaerobic since at these boiling temperatures hardly any oxygen will be available. In the example of Hydrothermal vents, where P. abyssi has been found, there is no sunlight and the pressure is around 200 atm in addition to the extremely high temperature.

Illustrations

Worked examples

Example 1 — a first encounter with Pyrococcus

Start with the simplest possible case. Write down what Pyrococcus 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 Pyrococcus 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 Pyrococcus 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 Pyrococcus

In research: Pyrococcus 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 Pyrococcus 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: Pyrococcus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Archaea genera, Archaea stubs, Methanobacteriati, so understanding it makes those chapters shorter.
In everyday life: Look for Pyrococcus 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 Pyrococcus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pyrococcus 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 Pyrococcus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pyrococcus in simple terms?

Pyrococcus is a genus of Thermococcaceaen archaeans. Description and significance Pyrococcus has similar characteristics of other thermoautotrophican archaea such as Archaeoglobus, and Methanococcus in the respect that they are all thermophilic and anaerobic.

Why does Pyrococcus 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 Pyrococcus?

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 Pyrococcus.