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相关概念视频

Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Bacterial Phylum Firmicutes01:27

Bacterial Phylum Firmicutes

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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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Bacterial Phylum Actinobacteria01:30

Bacterial Phylum Actinobacteria

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Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Bacterial Phylum Proteobacteria01:26

Bacterial Phylum Proteobacteria

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Proteobacteria, one of the largest and most diverse bacterial phyla, encompasses a wide range of Gram-negative bacteria distinguished by their outer membrane composed of lipopolysaccharides. These microorganisms exhibit various metabolic capabilities, including phototrophy, chemolithotrophy, and heterotrophy, and thrive in diverse environments from soil to aquatic systems and host-associated niches. The phylum is divided into six classes: Alphaproteobacteria, Betaproteobacteria,...
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Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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相关实验视频

Updated: Jul 15, 2025

The Cultivation, Growth, and Viability of Lactic Acid Bacteria: A Quality Control Perspective
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The Cultivation, Growth, and Viability of Lactic Acid Bacteria: A Quality Control Perspective

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乳球菌 (Lactococcus lactis) 是一种具有益生菌功能和致病性的细菌.

Fan Wu1, Xinmei Xie2, Tao Du1

  • 1College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, China.

World journal of microbiology & biotechnology
|September 30, 2023
PubMed
概括

乳球菌 (L. lactis) 是一种安全的益生菌,越来越多地与动物和人类的感染有关,如乳腺炎. 本综述考察了L. lactis的特征和多样性,其作为有益的微生物和病原体的双重作用.

关键词:
乳球球菌 (lactococcus lactis) 是一种乳球菌.乳腺炎是一种乳腺炎.安全的安全的安全的安全的安全.

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Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods
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Probiotic Studies in Neonatal Mice Using Gavage
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相关实验视频

Last Updated: Jul 15, 2025

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科学领域:

  • 微生物学 微生物学
  • 兽医医学 兽医医学 兽医医学
  • 食品科学 食品科学 食品科学

背景情况:

  • 乳球菌 (L. lactis) 是一种重要的乳酸细菌 (LAB),在动物肠道健康和免疫方面被公认为安全使用.
  • 由于在料,发酵和疫苗中具有商业价值,L. lactis也越来越多地被隔离出鱼类,鸟类,牛和人类的临床感染.
  • 虽然在历史上被用作乳制品益生菌,但L. lactis现在与牛乳腺炎有关,由于对病原体的理解不足,这构成了重大挑战.

研究的目的:

  • 分析由L. lactis引起的临床乳腺炎的发病率上升.
  • 综合讨论L. lactis的特征和多样性.
  • 为了解决有关L. lactis诱导的乳腺炎病变的知识差距.

主要方法:

  • 文献审查和现有研究的分析.
  • 检查涉及L. lactis感染的临床病例报告.
  • 对L. lactis菌株及其病原性潜力的比较分析.

主要成果:

  • 乳腺菌表现出双重性质,同时作为一种有益的益生菌和一种机会性病原体.
  • 有证据表明,L. lactis在奶牛中引起乳腺炎的趋势越来越大.
  • 在L. lactis菌株内存在显著的多样性,影响其病原性.

结论:

  • 需要进一步研究L. lactis的致病潜力,特别是在牛乳炎中.
  • 了解L. lactis的多样性对于区分有益菌株和致病菌株至关重要.
  • 本次审查强调,需要更新在畜牧业和临床环境中管理L. lactis的战略.