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Related Concept Videos

Development of Human Microbiota01:30

Development of Human Microbiota

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 the skin...
Composition of Blood Plasma01:24

Composition of Blood Plasma

Blood plasma is a fluid that contains approximately 92% water and 8% solutes. The solutes include various types of proteins, which constitute about 7% of the total solutes in the plasma. The high-molecular-weight proteins—albumins, globulins, and fibrinogen—are essential to plasma function. Albumins, making up about 60% of the plasma proteins, maintain the osmotic balance within blood vessels by preventing excessive water leakage. Additionally, albumins serve as carrier proteins, binding to...
Factors Influencing Bioavailability: First-Pass Elimination01:23

Factors Influencing Bioavailability: First-Pass Elimination

When a drug is taken orally, it undergoes a journey starting from the gastrointestinal (GI) tract, passing through the portal vein, reaching the liver, and finally entering the systemic circulation. This process involves the absorption of the drug across the GI tract. The liver is the primary site for metabolizing the drug, with some metabolism also occurring in the gut wall. This journey significantly reduces the quantity of the drug that reaches the systemic circulation, a phenomenon known as...
Bioavailability: Overview01:13

Bioavailability: Overview

Bioavailability refers to the proportion of an unaltered drug that, after administration, enters the systemic circulation and can be distributed to the desired action site. Factors such as gastrointestinal (GI) absorption and liver biotransformation influence the bioavailability of a drug when it is administered orally. When a drug is administered intravenously, it enters the systemic circulation directly; by definition, its bioavailability is assumed to be 100%. The bioavailability of an...
Bioavailability: Overview01:17

Bioavailability: Overview

Bioavailability refers to the proportion of an administered drug that reaches the systemic circulation in its active, unaltered form. It is a crucial pharmacokinetic parameter that determines the effectiveness of a drug in achieving its intended therapeutic outcomes. The route of administration significantly influences bioavailability, with intravenous administration achieving 100% bioavailability as the drug directly enters the bloodstream. In contrast, oral administration often results in...
Anatomy of the Intestines01:23

Anatomy of the Intestines

Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...

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Related Experiment Video

Updated: May 16, 2026

Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings
04:16

Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings

Published on: February 7, 2025

Human milk composition: nutrients and bioactive factors.

Olivia Ballard1, Ardythe L Morrow

  • 1Division of Immunobiology, Center for Interdisciplinary Research in Human Milk and Lactation, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA. Olivia.Ballard@cchmc.org

Pediatric Clinics of North America
|November 27, 2012
PubMed
Summary
This summary is machine-generated.

Human milk composition is the biological norm for infant nutrition, containing bioactive molecules crucial for development and immunity. Its composition varies significantly, impacting clinical relevance and therapeutic potential.

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Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit
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Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Published on: December 16, 2015

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Last Updated: May 16, 2026

Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings
04:16

Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings

Published on: February 7, 2025

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit
07:38

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Published on: December 16, 2015

Area of Science:

  • Human biology
  • Nutritional science
  • Immunology

Background:

  • Human milk is the optimal nutrition for infants.
  • It contains numerous bioactive molecules essential for infant health.
  • Understanding milk composition is vital for infant care and potential therapeutics.

Purpose of the Study:

  • To provide an overview of human milk composition.
  • To discuss the variations in human milk.
  • To highlight the clinical relevance of human milk.

Main Methods:

  • Literature review of human milk composition studies.
  • Analysis of factors influencing milk variation.
  • Synthesis of clinical implications.

Main Results:

  • Human milk composition is highly variable.
  • It changes based on lactation stage, feeding, gestational age, time of day, and maternal factors.
  • Bioactive molecules offer protection against infection and inflammation.

Conclusions:

  • Human milk composition is dynamic and complex.
  • Variations influence its role in infant development and health.
  • Bioactive components show therapeutic promise.