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Related Concept Videos

Characteristics and Functions of Blood01:26

Characteristics and Functions of Blood

Blood is specialized connective tissue comprising about 8% of the body mass. It has a thick, liquid extracellular matrix that contains cells, dissolved proteins, and electrolytes, making it five times more viscous than water. Blood is warm, around 38°C, and has an alkaline pH ranging from 7.35 to 7.45.
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
Introduction to Hemostasis01:05

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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Liver Physiology01:30

Liver Physiology

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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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Fluid Connective Tissues: Blood and Lymph

Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
Blood
The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.

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Updated: May 21, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Haemophore functions revisited.

Cécile Wandersman1, Philippe Delepelaire

  • 1Unité des Membranes Bactériennes, Institut Pasteur, Département de Microbiologie, 25-28, rue du Dr. Roux, 75724 Paris Cedex 15, France. cwander@pasteur.fr

Molecular Microbiology
|June 22, 2012
PubMed
Summary
This summary is machine-generated.

Bacteria acquire iron from heme using specialized proteins called hemeophores and siderophores. This review details how these molecules combat host nutritional immunity by extracting heme and iron for bacterial use.

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Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
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Last Updated: May 21, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Blood Collection from the American Horseshoe Crab, Limulus Polyphemus
12:48

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus

Published on: October 13, 2008

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Nutritional Immunity

Background:

  • Bacteria require iron for survival and growth within host organisms.
  • Host organisms restrict iron availability through nutritional immunity, binding iron and heme to host proteins.
  • Bacterial heme and iron acquisition systems are crucial for pathogenesis.

Purpose of the Study:

  • To review recent discoveries in bacterial heme acquisition systems.
  • To compare and contrast the mechanisms of hemeophores and siderophores in acquiring heme.
  • To highlight the role of bacterial surface proteins in heme transfer and uptake.

Main Methods:

  • Literature review of recent research on bacterial heme and iron acquisition.
  • Comparative analysis of hemeophore and siderophore functions.
  • Focus on bacterial surface proteins involved in heme transfer and receptor-mediated uptake.

Main Results:

  • Hemeophores and siderophores are key bacterial strategies to overcome host nutritional immunity.
  • Both systems involve high-affinity binding molecules that extract iron or heme from host proteins.
  • Bacterial surface proteins facilitate the transfer of heme from host sources to cellular transporters.

Conclusions:

  • Bacterial heme acquisition systems are diverse and essential for growth in host environments.
  • Understanding these mechanisms provides insights into host-pathogen interactions and potential therapeutic targets.
  • Recent advances reveal complex interplay between bacterial proteins and host factors in iron acquisition.