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Diversity of Protists I

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...

Diversity of Protists II

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

Malaria

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Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...

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Related Experiment Video

Updated: Jul 13, 2026

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Published on: January 14, 2018

Iron acquisition by parasitic protozoa.

M E Wilson¹, B E Britigan

¹Department of Internal Medicine and Microbiology, University of Iowa, and the Veterans' Affairs Medical Center, Iowa City, IA, USA.

Parasitology Today (Personal Ed.)

|October 17, 2006

Summary

Microorganisms need iron to survive, while hosts sequester it to fight pathogens. This review covers how microbes scavenge iron and impact host virulence.

Area of Science:

Microbiology
Immunology
Pathogenesis

Background:

Iron is vital for microbial survival and proliferation.
Mammalian hosts restrict iron availability to inhibit pathogen growth.
Pathogens have evolved sophisticated mechanisms to acquire iron during infection.

Purpose of the Study:

To review microbial iron scavenging mechanisms during host infection.
To discuss the impact of these mechanisms on microbial virulence.
To highlight the interplay between host iron sequestration and microbial adaptation.

Main Methods:

Literature review of scientific articles on microbial iron metabolism and host-pathogen interactions.
Analysis of studies detailing bacterial and protozoan iron uptake strategies.

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Quantification of Intracellular Growth Inside Macrophages is a Fast and Reliable Method for Assessing the Virulence of Leishmania Parasites

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Concomitant Isolation of Primary Astrocytes and Microglia for Protozoa Parasite Infection

Concomitant Isolation of Primary Astrocytes and Microglia for Protozoa Parasite Infection

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Last Updated: Jul 13, 2026

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

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Published on: January 14, 2018

Quantification of Intracellular Growth Inside Macrophages is a Fast and Reliable Method for Assessing the Virulence of Leishmania Parasites

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Concomitant Isolation of Primary Astrocytes and Microglia for Protozoa Parasite Infection

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Published on: March 18, 2020

Synthesis of findings on the role of iron acquisition in microbial virulence.

Main Results:

Bacteria and protozoa employ diverse strategies to obtain iron from host environments.
Iron scavenging mechanisms are crucial for microbial pathogenesis and survival.
These mechanisms can contribute to disease severity and persistence.

Conclusions:

Microbial iron acquisition is a critical factor in host-pathogen dynamics.
Understanding these mechanisms offers potential targets for therapeutic interventions.
Effective iron scavenging by microbes is a key determinant of virulence.