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Related Concept Videos

Development of Human Microbiota01:30

Development of Human Microbiota

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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Immune Surveillance by NK Cells and Phagocytes01:25

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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
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Factors Influencing Microbial Growth: pH01:29

Factors Influencing Microbial Growth: pH

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Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
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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.
Phagocytes
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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Development of the Oral Microbiota01:28

Development of the Oral Microbiota

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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

77
The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
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Related Experiment Video

Updated: May 4, 2026

Isolation of Human Monocytes by Double Gradient Centrifugation and Their Differentiation to Macrophages in Teflon-coated Cell Culture Bags
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[Microbiotic factor influencing the mononuclear phagocyte system development].

G I Podoprigora

    Vestnik Rossiiskoi Akademii Meditsinskikh Nauk
    |December 18, 2013
    PubMed
    Summary
    This summary is machine-generated.

    The microbiota significantly influences the mononuclear-phagocyte system, impacting immunity and host defense. Microbiologically controlled animals (gnotobiotes) reveal the complex role of microbial factors in various physiological and pathological conditions.

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    Area of Science:

    • Immunology
    • Microbiology
    • Host-Pathogen Interactions

    Context:

    • The mononuclear-phagocyte system is crucial for natural immunity.
    • Conventional animal models with uncontrolled microflora limit understanding of microbiota's role.
    • Autoflora (microbiota) impacts mononuclear-phagocyte system development and function.

    Purpose:

    • To review systemic studies on the role of microbiota in the mononuclear-phagocyte system.
    • To highlight the utility of gnotobiotes for studying host-microbiota interactions.
    • To demonstrate the multifaceted influence of microbial factors on host defense mechanisms.

    Summary:

    • Microbiota critically modulates mononuclear-phagocyte system activity, affecting phagocytic function, colonization resistance, and barrier integrity.
    • Studies using gnotobiotes demonstrate the microbial factor's influence on aging, inflammation, burns, and temperature regulation.
    • Microbial factors stimulate and modulate both cellular and humoral components of the host defense system.

    Impact:

    • Gnotobiotic models offer a prospective approach for analyzing "host-microbiota" interactions.
    • This research aids in evaluating novel probiotic candidates and developing clinical microbial control strategies.
    • Understanding these interactions is vital for advancing infectious disease research and therapeutic interventions.