biology

Parramatta River virus

Parramatta River virus 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 Parramatta River virus rather than just read about it. In short: Parramatta River virus (PaRV) is an insect virus belonging to Flaviviridae and endemic to Australia. It was discovered in 2015.

Key takeaways

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

Reference excerpt

Parramatta River virus (PaRV) is an insect virus belonging to Flaviviridae and endemic to Australia. It was discovered in 2015. The virus was identified from the mosquito Aedes vigilax collected from Sydney under the joint research project by scientists at the University of Queensland and the University of Sydney. In experimental infections, the virus is unable to grow in vertebrate cells, but only in Aedes-derived mosquito cell lines. This suggests that the virus does not infect vertebrates. The name is given because it was discovered from Silverwater, a suburb of Sydney on the southern bank of the Parramatta River. The mosquitoes from which the virus was isolated were actually collected in 2007, and had been preserved since then. The study commenced only after the development of the technique of viral detection in mosquitoes in the University of Queensland. The virus was identified as a result of investigation on the outbreak of Ross River virus in 2015. Both the viruses are transmitted by the same mosquitoes, but PaRV is not transmitted to humans, unlike RRV. According to one of the co-authors, Cameron Webb of the University of Sydney, this unique transmission of PaRV could hold a key "to vaccinate mosquitoes and stop their bites making thousands of Australians sick every summer." The reason, explained by Jody Hobson-Peters of the University of Queensland, is that if mosquitoes (vectors for human diseases) are infected with the PaRV, then they will no longer be able to carry other human-infectious viruses. The virus was identified from the whole genome sequence using Sanger sequencing. The viral genome consists of 10,893 nucleotides and encodes a polyprotein of 3384 amino acids. Comparison with the genomes of other viruses showed that its closest relatives are the Mediterranean Ochlerotatus flavivirus (MoFV) isolated from Ochlerotatus mosquitoes in Spain, and the Hanko virus (HANKV) from Ochlerotatus mosquitoes in Finland (both identified in 2012). With MoFV its shares 72.7% nucleotide identity, and with HANKV the nucleotide similarity is 71.4%. The complete structure of the 3'UTR RNA of PaRV has been solved, revealing that that PaRV has evolved to produce multiple separate sfRNAs from its 3'UTR. Duplicated xrRNAs in PaRV and other insect-specific Flaviviruses appear to be evolutionarily selected for to provide functional redundancy allowing the production of sfRNAs if one structures is disabled by mutations.

References

Worked examples

Example 1 — a first encounter with Parramatta River virus

Start with the simplest possible case. Write down what Parramatta River virus 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 Parramatta River virus 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 Parramatta River virus 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 Parramatta River virus

In research: Parramatta River virus 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 Parramatta River virus 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: Parramatta River virus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diptera pests and diseases, Flaviviruses, Insect viral diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Parramatta River virus 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 Parramatta River virus in 20 minutes

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

Frequently asked questions

What is Parramatta River virus in simple terms?

Parramatta River virus (PaRV) is an insect virus belonging to Flaviviridae and endemic to Australia. It was discovered in 2015.

Why does Parramatta River virus 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 Parramatta River virus?

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 Parramatta River virus.