science

Aspiviridae

Aspiviridae is a science 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 Aspiviridae rather than just read about it. In short: Aspiviridae, formerly Ophioviridae, is a family of segmented negative-strand RNA viruses which infect plants. Member viruses are characterized by an elongated and highly filamentous and flexible nucleocapsid with helical symmetry.

Key takeaways

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

Reference excerpt

Aspiviridae, formerly Ophioviridae, is a family of segmented negative-strand RNA viruses which infect plants. Member viruses are characterized by an elongated and highly filamentous and flexible nucleocapsid with helical symmetry. It is a monotypic taxon containing only one genus, Ophiovirus. Aspiviridae is also the only family in the order Serpentovirales, which in turn is the only order in the class Milneviricetes.

History The name Aspiviridae derives from the Latin aspis (snake or viper), referring to the shape, along with the suffix for a virus family -viridae. Ophiovirus derives from the Ancient Greek ophis, "snake", with –virus the suffix for a virus genus. Likewise, Serpentovirales is from "serpent" with -virales the suffix for a virus order. Milneviricetes is in honor of Robert G. Milne, the last author on the first paper describing ophioviruses.

Virology

Structure The protein capsid is non-enveloped and has a constant diameter of 1500–2500 nm and a width of 3 nm, or 9 nm. The capsids form kinked circles, which can collapse to form linear duplex structures, much like a spring.

Genome Member viruses have segmented, negative-sense, single-stranded RNA genomes. The entire genome is 11000–12000 nucleotides long.

Taxonomy

The family has one genus, Ophiovirus, which has eight recognized species. Members of both the family and the genus are referred to as ophioviruses. Ophiovirus contains the following species, listed by scientific name and followed by the exemplar virus of the species:

Ophiovirus capsici, Pepper chlorosis associated virus Ophiovirus citri, Citrus psorosis virus Ophiovirus freesiae, Freesia sneak virus Ophiovirus lactucae, Lettuce ring necrosis virus Ophiovirus mirafioriense, Mirafiori lettuce big-vein virus Ophiovirus ranunculi, Ranunculus white mottle virus Ophiovirus tulipae, Tulip mild mottle mosaic virus Ophiovirus vaccinii, Blueberry mosaic associated virus

References

External links ICTV Online Report Ophioviridae Viralzone: Ophioviridae

Illustrations

Worked examples

Example 1 — a first encounter with Aspiviridae

Start with the simplest possible case. Write down what Aspiviridae claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Aspiviridae 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 Aspiviridae 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 Aspiviridae

In research: Aspiviridae appears in science 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 Aspiviridae 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: Aspiviridae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aspiviridae, Virus families, so understanding it makes those chapters shorter.
In everyday life: Look for Aspiviridae 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 Aspiviridae in 20 minutes

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

Frequently asked questions

What is Aspiviridae in simple terms?

Why does Aspiviridae matter?

Because it connects several science 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 Aspiviridae?

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 Aspiviridae.