science

Modulibacteria

Modulibacteria 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 Modulibacteria rather than just read about it. In short: Modulibacteria (Moduliflexota) is a bacterial phylum formerly known as KS3B3 or GN06. It is a candidate phylum, meaning there are no cultured representatives of this group.

Key takeaways

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

Reference excerpt

Modulibacteria (Moduliflexota) is a bacterial phylum formerly known as KS3B3 or GN06. It is a candidate phylum, meaning there are no cultured representatives of this group. Members of the Modulibacteria phylum are known to cause fatal filament overgrowth (bulking) in high-rate industrial anaerobic wastewater treatment bioreactors. The Modulibacteria phylum was first proposed in 2006 by two independent research groups based on analyses of 16S rRNA gene sequences. One group recovered Modulibacteria sequences from the a hypersaline microbial mat from Guerrero Negro (Baja California Sur, Mexico) and used the provisional name GN06 for the novel phylum, while the other recovered sequences from sulfur-rich black mud marine sediments (CA, USA) and used the provisional name KSB3. The first genomic insights into the phylum were achieved in 2015, at which time the name "Modulibacteria" was proposed. Two genomes were recovered from methanogenic sludge samples of a full-scale upflow anaerobic sludge blanket (UASB) reactor treating a high-strength organic wastewater discharged from a food-processing factory. Through a combination of genome-based metabolic reconstruction and microscopic observation, it was determined that the two studied Modulibacteria species (Moduliflexus flocculans and Vecturithrix granuli) produce filamentous structures and are Gram-negative, strictly anaerobic fermenters capable of non-flagellar based gliding motility. Both have an unusually large number of sensory and response regulator genes compared to other bacteria. Members of the Modulibacteria phylum have been detected in a variety of environments in addition to bioreactors and hypersaline mats, such as wetland sediments (FJ516883.1), the dolphin mouth, and a tubeworm from a coldseep (FM165273).

Taxonomy The following taxonomy was proposed by Sekiguchi et al. 2015 and phylogeny by GTDB 08-RS214

Class "Moduliflexia" Sekiguchi et al. 2015 ["Vecturitrichia" Sekiguchi et al. 2015] Order "Moduliflexales" Sekiguchi et al. 2015 ["Vecturatrichales" Sekiguchi et al. 2015] Family "Moduliflexaceae" Sekiguchi et al. 2015 ["Vecturatrichaceae" Sekiguchi et al. 2015] Genus "Candidatus Moduliflexus" Sekiguchi et al. 2015 Species "Ca. M. flocculans" Sekiguchi et al. 2015 Genus "Candidatus Vecturithrix" Sekiguchi et al. 2015 Species "Ca. V. granuli" Sekiguchi et al. 2015

References

Worked examples

Example 1 — a first encounter with Modulibacteria

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

In research: Modulibacteria 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 Modulibacteria 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: Modulibacteria is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteria phyla, Candidatus taxa, so understanding it makes those chapters shorter.
In everyday life: Look for Modulibacteria 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 Modulibacteria in 20 minutes

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

Frequently asked questions

What is Modulibacteria in simple terms?

Modulibacteria (Moduliflexota) is a bacterial phylum formerly known as KS3B3 or GN06. It is a candidate phylum, meaning there are no cultured representatives of this group.

Why does Modulibacteria 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 Modulibacteria?

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 Modulibacteria.