science

Lactobacillus paragasseri

Lactobacillus paragasseri 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 Lactobacillus paragasseri rather than just read about it. In short: Lactobacillus paragasseri is a species of lactic acid bacterium in the family Lactobacillaceae. It is closely related to Lactobacillus gasseri.

Key takeaways

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

Reference excerpt

Lactobacillus paragasseri is a species of lactic acid bacterium in the family Lactobacillaceae. It is closely related to Lactobacillus gasseri. Its cells are Gram-positive, rod-shaped, non-motile, non-spore-forming, and catalase-negative. The type strain is facultatively anaerobic and was isolated from human feces.

Taxonomy The species was delineated through a genome-based reassessment of strains JCM 5343T, JCM 5344, and JCM 1130, which had previously been identified as L. gasseri. A later genomic survey found that the full-length 16S rRNA gene sequences of L. paragasseri and L. gasseri differ by only two nucleotides. Twenty publicly deposited genomes labelled as L. gasseri were reassigned to L. paragasseri using whole-genome comparisons. Whole-genome data are therefore generally needed to distinguish the two species reliably. The specific epithet combines the Greek prefix para-, meaning resembling, with gasseri, the epithet of L. gasseri; the name therefore means “resembling Lactobacillus gasseri”.

Characteristics The strains used to delimit the species grow at temperatures from 25 to 45 °C and in medium containing 2.0% sodium chloride. Their major cellular fatty acids are C16:0 and C18:1 ω9c. The type strain forms circular, grey-white colonies on MRS agar.

Isolation sources Genome metadata and associated literature have recorded L. paragasseri isolates from human stool and other gastrointestinal samples, the vaginal tract, urine, lung or aspirate samples, breast milk, a wound, and the oral cavity. The type strain, JCM 5343T, was isolated from human feces, while strain JCM 5344 was isolated from the vaginal tract. Genome-sequenced strains have also been cultured from catheterized and voided urine. Three strains were recovered from voided urine samples from women with type 2 diabetes.

Genomic and biochemical studies In a comparative analysis of 79 publicly available L. gasseri and L. paragasseri genome assemblies, every L. paragasseri genome examined contained genes for one or both of the bacteriocins gassericin T and gassericin S. In vitro characterization of the type strain identified a bile salt hydrolase that hydrolyzed conjugated bile salts and also showed activity against penicillin.

References

Worked examples

Example 1 — a first encounter with Lactobacillus paragasseri

Start with the simplest possible case. Write down what Lactobacillus paragasseri 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 Lactobacillus paragasseri 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 Lactobacillus paragasseri 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 Lactobacillus paragasseri

In research: Lactobacillus paragasseri 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 Lactobacillus paragasseri 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: Lactobacillus paragasseri is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteria described in 2018, Gram-positive bacteria, Gut flora bacteria, so understanding it makes those chapters shorter.
In everyday life: Look for Lactobacillus paragasseri 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 Lactobacillus paragasseri in 20 minutes

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

Frequently asked questions

What is Lactobacillus paragasseri in simple terms?

Lactobacillus paragasseri is a species of lactic acid bacterium in the family Lactobacillaceae. It is closely related to Lactobacillus gasseri.

Why does Lactobacillus paragasseri 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 Lactobacillus paragasseri?

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 Lactobacillus paragasseri.