Name: firmicutes: bacteria, fermentation, and spores
Uploaded: 2025-06-12T09:22:02.000Z
Duration: 1 min 27 s
Channel: JoVE

Las firmicutes son bacterias grampositivas caracterizadas por un bajo contenido de guanina-citosina en sus genomas. Los principales órdenes de este filo son Lactobacillales, Clostridiales y Bacillales.El orden Lactobacillales comprende bacterias lácticas no esporulantes. Muchas especies son anaerobias fermentativas y aerotolerantes, lo que significa que pueden crecer en presencia de oxígeno.Los ejemplos incluyen especies de Lactobacillus y Lactococcus asociadas a los lácteos, especies de Streptococcus patógenas y no patógenas y especies de Enterococcus, generalmente de origen fecal, que pueden ser patógenas para los humanos.Los órdenes Bacillales y Clostridiales incluyen especies de diversas propiedades.El orden Bacillales incluye géneros no esporulantes como Listeria en forma de bastoncillo y el coco formador de racimos, Staphylococcus. Bacillus y Paenibacillus son los géneros formadores de endosporas más notables en este orden.En el orden Clostridiales, Sarcina es un género no esporulante que incluye especies tolerantes a los ácidos. Los géneros formadores de endosporas incluyen un género bien conocido, Clostridium, y el género Sporosarcina, un género único de cocos formadores de endosporas.

filo bacteriano: firmicutes

Bacterial Phylum Firmicutes

Firmicutes es un filo diverso de bacterias Gram positivas caracterizado por un bajo contenido de GC en sus genomas. Este filo incluye organismos con envolturas celulares monodermas o didermas, lo que pone de manifiesto una historia evolutiva compleja. Firmicutes comprende varias &#243;rdenes principales, entre ellas Lactobacillales, Clostridiales y Bacillales, que presentan una notable diversidad en su morfolog&#237;a, metabolismo y funciones ecol&#243;gicas.
La orden Lactobacillales incluye las bacterias l&#225;cticas, organismos fermentativos que producen &#225;cido l&#225;ctico como producto metab&#243;lico principal. Estos bacilos o cocos no esporulados dependen del metabolismo fermentativo y de la fosforilaci&#243;n a nivel de sustrato para obtener energ&#237;a. Los g&#233;neros importantes incluyen Lactobacillus y Lactococcus, com&#250;nmente asociados a la fermentaci&#243;n de productos l&#225;cteos. Las especies de Streptococcus, tanto pat&#243;genas como no pat&#243;genas, forman cadenas o t&#233;tradas, mientras que las especies de Enterococcus est&#225;n estrechamente asociadas al ser humano como parte de la flora normal.
La orden Bacillales incluye g&#233;neros tanto esporulados como no esporulados. Entre los g&#233;neros no esporulados destacan Listeria, con morfolog&#237;a de bacilo, y Staphylococcus, con morfolog&#237;a de coco formando agrupaciones. Los g&#233;neros formadores de endosporas como Bacillus y Paenibacillus son relevantes por su versatilidad ecol&#243;gica y aplicaciones industriales. La orden Clostridiales abarca g&#233;neros no esporulados como Sarcina, tolerante a &#225;cidos, y g&#233;neros esporulados como Clostridium y Sporosarcina. Estos organismos prosperan en condiciones anaer&#243;bicas y participan en procesos metab&#243;licos diversos.
Una caracter&#237;stica singular de los Firmicutes es la presencia de g&#233;neros fototr&#243;ficos como Heliobacterium y Heliophilum, que realizan fotos&#237;ntesis anoxig&#233;nica utilizando bacterioclorofila g. Estas especies anaerobias carecen de membranas fotosint&#233;ticas intracitoplasm&#225;ticas y utilizan piruvato para el crecimiento fotoheter&#243;trofo. Otro grupo interesante lo constituyen las bacterias didermas dentro de las clases Negativicutes y Halanaerobiia, que poseen membranas externas similares a las de las bacterias Gram negativas, lo cual sugiere una trayectoria evolutiva compleja.
Firmicutes desempe&#241;a funciones fundamentales en ecosistemas, industrias y la salud humana, demostrando adaptaciones metab&#243;licas y estructurales extraordinarias que sustentan su &#233;xito evolutivo.

Filo bacteriano: Firmicutes

Firmicutes es un filo diverso de bacterias Gram positivas caracterizado por un bajo contenido de GC en sus genomas. Este filo incluye organismos con ...

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firmicutes: bacteria, fermentation, and spores

Firmicutes are a diverse phylum of Gram-positive bacteria with low GC content in their genomes. They include both monoderm and diderm cell envelopes, which points to a complex evolutionary history. Their members show wide variation in shape, metabolism, and ecological role.

Three major orders help show this diversity: Lactobacillales, Clostridiales, and Bacillales. Lactobacillales include lactic acid bacteria, which are fermentative organisms that make lactic acid as their main product. These non-sporulating rods or cocci use fermentation and substrate-level phosphorylation for energy.

Well-known Lactobacillales genera include Lactobacillus and Lactococcus, both commonly linked to dairy fermentation. Streptococcus species may be pathogenic or nonpathogenic and often form chains or tetrads. Enterococcus species are closely associated with humans as part of the normal flora.

Bacillales includes both nonsporulating and endospore-forming genera. Nonsporulating examples include rod-shaped Listeria and cluster-forming coccus Staphylococcus. Endospore-forming genera such as Bacillus and Paenibacillus are known for ecological versatility and industrial uses.

Clostridiales also includes both nonsporulating and endospore-forming members. Acid-tolerant Sarcina is a nonsporulating example, while Clostridium and Sporosarcina form endospores. These organisms thrive in anaerobic conditions and take part in a range of metabolic processes.

Firmicutes also include unusual phototrophic genera such as Heliobacterium and Heliophilum. These anaerobic species carry out anoxygenic photosynthesis with bacteriochlorophyll g. They lack intracytoplasmic photosynthetic membranes and use pyruvate for photoheterotrophic growth.

Another notable group within Firmicutes is the diderm bacteria in the classes Negativicutes and Halanaerobiia. These organisms have outer membranes like Gram-negative bacteria. Their cell structure adds to the evidence for a complex evolutionary path. Firmicutes are important in ecosystems, industry, and human health because of their structural and metabolic adaptations.

Firmicutes: Bacteria, Fermentation, and Spores

firmicutes-bacteria-fermentation-and-spores

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bacterial phylum actinobacteria

Actinobacteria: Soil Bacteria and Cheese

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bacterial phylum firmicutes

Firmicutes are a diverse phylum of Gram-positive bacteria with low GC content in their genomes. They include both monoderm and diderm cell envelopes, which points to a complex evolutionary history. Their members show wide variation in shape, metabolism, and ecological role. Three major orders help show this diversity: Lactobacillales, Clostridiales, and Bacillales. Lactobacillales include lactic acid bacteria, which are fermentative organisms that make lactic acid as their main product. These...

bacterial phylum bacteroidota

Gut and Environment Bacteria in Bacteroidota

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Archaea Extremes: Euryarchaeota

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diversity of archaea ii

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diversity of archaea iii

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Zygomycota: Spores, Hyphae, and Roles

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Microsporidia Spores and Host Infection

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red algae

Red Algae Pigments, Shapes, and Uses

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green algae

Green Algae: Forms, Habitats, and Roles

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other algae

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diversity of protists i

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diversity of protists ii

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diversity of protists iii

Rhizaria: Pseudopods, Tests, and Skeletons

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diversity of protists iv

Amoebozoa: Movement and Life Cycles

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key terms and concepts

Explore Firmicutes as a diverse bacterial phylum, from lactic acid fermentation and endospores to unusual phototrophic and diderm members.

Firmicutes: Bacteria, Fermentation, and Spores | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

Firmicutes: Bacteria, Fermentation, and Spores

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