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

Firmicutes, genomlarında düşük guanin-sitozin içeriği ile karakterize edilen Gram pozitif bakterilerdir. Bu filumun ana takımları Lactobacillales, Clostridiales ve Bacillales'tir. Lactobacillales takımı, sporlaşmayan laktik asit bakterilerini içerir. Birçok tür fermentatif, aerotolerant anaeroblardır, yani oksijen varlığında büyüyebilirler. Örnekler arasında süt ürünleriyle ilişkili Lactobacillus ve Lactococcus türleri, patojenik ve patojenik olmayan Streptococcus türleri ve insanlar için patojenik olabilen Enterococcus türleri sayılabilir. Siparişler Bacillales ve Clostridiales, çeşitli özelliklere sahip türleri içerir. Bacillales takımı, çubuk şeklindeki Listeria ve küme oluşturan kok — Staphylococcus gibi sporlaşmayan cinsleri içerir. Bacillus ve Paenibacillus bu sırayla dikkate değer endospor oluşturan cinslerdir. Clostridiales takımına göre, Sarcina , aside toleranslı türler içeren, sporlaşmayan bir cinstir. Endospor oluşturan cinsler, iyi bilinen bir cins olan Clostridium ve benzersiz bir endospor oluşturan kok cinsi olan Sporosarcina cinsini içerir.

bakteri filumu: firmicutes

Bacterial Phylum Firmicutes

Firmicutes, genomlar&#305;nda d&#252;&#351;&#252;k GC (guanin-sitozin) i&#231;eri&#287;i ile karakterize edilen Gram-pozitif bakterilerden olu&#351;an &#231;e&#351;itli bir &#351;ubedir. Bu &#351;ube, monoderm (tek zar) veya diderm (&#231;ift zar) h&#252;cre zarlar&#305;na sahip organizmalar&#305; i&#231;erir ve bu durum karma&#351;&#305;k bir evrimsel ge&#231;mi&#351;e i&#351;aret eder. Firmicutes, morfoloji, metabolizma ve ekolojik roller a&#231;&#305;s&#305;ndan b&#252;y&#252;k &#231;e&#351;itlilik g&#246;steren Lactobacillales, Clostridiales ve Bacillales gibi ba&#351;l&#305;ca tak&#305;mlar&#305; kapsar.
Lactobacillales tak&#305;m&#305;, laktik asit bakterilerini i&#231;erir; bu bakteriler fermantatif organizmalar olup, temel metabolik &#252;r&#252;n olarak laktik asit &#252;retirler. Spor olu&#351;turmayan bu &#231;ubuk ya da kok &#351;eklindeki bakteriler, enerjilerini fermantatif metabolizma ve substrat d&#252;zeyinde fosforilasyon yoluyla elde eder. &#214;nemli cinsler aras&#305;nda, genellikle s&#252;t &#252;r&#252;nlerinin fermantasyonuyla ili&#351;kilendirilen Lactobacillus ve Lactococcus yer al&#305;r. Streptococcus t&#252;rleri (patojenik ve patojenik olmayan) zincir ya da tetrad yap&#305;lar olu&#351;tururken, Enterococcus t&#252;rleri insanlarla yak&#305;n ili&#351;kili olup normal mikrobiyotan&#305;n bir par&#231;as&#305;d&#305;r.
Bacillales tak&#305;m&#305;, spor olu&#351;turmayan ve endospor olu&#351;turan cinsleri i&#231;erir. Spor olu&#351;turmayan cinsler aras&#305;nda &#231;ubuk bi&#231;imli Listeria ve k&#252;meler olu&#351;turan kok formundaki Staphylococcus dikkat &#231;eker. Bacillus ve Paenibacillus gibi endospor olu&#351;turan cinsler, ekolojik uyum yetenekleri ve end&#252;striyel uygulamalardaki &#246;nemiyle bilinir.Clostridiales tak&#305;m&#305; ise yine hem spor olu&#351;turmayan hem de endospor olu&#351;turan cinsleri i&#231;erir. Spor olu&#351;turmayanlar aras&#305;nda, asidik ortamlara toleransl&#305; olan Sarcina yer al&#305;rken; Clostridium ve Sporosarcina, bu tak&#305;m&#305;n endospor olu&#351;turan cinslerine &#246;rnektir. Bu mikroorganizmalar genellikle anaerobik ko&#351;ullarda geli&#351;ir ve &#231;e&#351;itli metabolik s&#252;re&#231;lere katk&#305; sa&#287;larlar.
Firmicutes filumunun dikkat &#231;ekici bir &#246;zelli&#287;i, Heliobacterium ve Heliophilum gibi fototrofik cinsler i&#231;ermesidir; bu bakteriler bakteri klorofili g kullanarak anoksijenik fotosentez yapar. Bu anaerobik t&#252;rler, sitoplazma i&#231;i fotosentetik membranlara sahip de&#287;ildir ve pir&#252;vat kullanarak fotoheterotrofik olarak b&#252;y&#252;r.&#304;lgin&#231; bir di&#287;er grup ise, Negativicutes ve Halanaerobiia s&#305;n&#305;flar&#305; i&#231;inde yer alan diderm bakterilerdir; bu organizmalar Gram-negatif bakterilere benzer d&#305;&#351; zarlar ta&#351;&#305;r ve bu durum, karma&#351;&#305;k bir evrimsel yolculu&#287;a i&#351;aret eder.
Firmicutes, ekosistemlerde, sanayide ve insan sa&#287;l&#305;&#287;&#305;nda &#246;nemli roller oynar; ola&#287;an&#252;st&#252; metabolik ve yap&#305;sal adaptasyonlar&#305;, bu &#351;ubenin evrimsel ba&#351;ar&#305;s&#305;n&#305; destekler.

Bakteri filumu: Firmicutes

Firmicutes, genomlar&#305;nda d&#252;&#351;&#252;k GC (guanin-sitozin) i&#231;eri&#287;i ile karakterize edilen Gram-pozitif bakterilerden olu&#351;an ...

Education

JoVE Core

Microbiology

Mikrobiyoloji

Unit

Birim

Microbial Diversity

Mikrobiyal Çeşitlilik

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

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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Planctomycetes Cell Structure and Life Cycle

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Actinobacteria: Soil Bacteria and Cheese

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bacterial phylum firmicutes

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Gut and Environment Bacteria in Bacteroidota

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Mycoplasmas and Wall-Less Bacteria

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other unique bacteria

Magnetotactic and DNA-Resistant Bacteria

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overview of archaea

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Archaea Extremes: Euryarchaeota

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diversity of archaea ii

New Archaea Phyla and Their Roles

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How Hyperthermophilic Archaea Survive Heat

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Zygomycota: Spores, Hyphae, and Roles

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Microsporidia Spores and Host Infection

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Ascomycota: Sac Fungi and Their Spore Cycle

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Basidiomycota: Mushrooms, Spores, and Ecological Roles

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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

Stramenopile Algae: Diatoms, Golden, Brown

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diversity of protists i

Excavata Protists and Their Adaptations

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diversity of protists ii

Alveolates: Ciliates, Dinoflagellates, Apicomplexans

Alveolates are protists with tiny sacs called alveoli beneath the cell membrane. These sacs may help control water balance by limiting how much water moves in and out of the cell. In dinoflagellates, alveoli may also act like armor plates. The three main alveolate groups are ciliates, dinoflagellates, and apicomplexans. Ciliates move with cilia, which are short hair-like structures that can cover the whole cell or appear in rows or tufts. One well-known ciliate is Paramecium, which uses cilia...

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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