Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Microbial Classification System01:24

Microbial Classification System

Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...
Methods of Classification and Identification01:28

Methods of Classification and Identification

Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
Bacterial Phylum Spirochaetes01:30

Bacterial Phylum Spirochaetes

Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased by a...
Bacterial Phylum Actinobacteria01:30

Bacterial Phylum Actinobacteria

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...
Special Staining Techniques01:13

Special Staining Techniques

Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
Streptococcal Pharyngitis01:27

Streptococcal Pharyngitis

Streptococcal pharyngitis, commonly known as “strep throat,” is an acute infection of the oropharyngeal tissues caused by the Gram‑positive Group A Streptococcus (Streptococcus pyogenes). Transmission occurs primarily through respiratory droplets expelled during coughing, sneezing, or talking.Mechanisms of Host Entry and Immune EvasionUpon entering the host, S. pyogenes adheres to the mucosal epithelial cells of the pharynx via surface proteins, notably lipoteichoic acid and the antiphagocytic...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Three routes to crypsis: Stasis, convergence, and parallelism in the Mastigias species complex (Scyphozoa, Rhizostomeae).

Molecular phylogenetics and evolution·2016
Same author

Type-specific protection and immunity following intranasal inoculation of monkeys with group A hemolytic streptococci.

The Journal of experimental medicine·2010
Same author

An Address on the Allergic Conception of Rheumatic Fever.

Canadian Medical Association journal·2010
Same author

Modern techniques for studying hemolytic streptococci.

Bulletin of the U.S. Army Medical Department. United States. Army. Medical Department·2010
Same author

Symposium on significant developments in the field of chest diseases.

Missouri medicine·2010
Same author

The pneumonias.

Missouri medicine·2010
Same journal

Retraction: In vivo NCL targeting affects breast cancer aggressiveness through miRNA regulation.

The Journal of experimental medicine·2026
Same journal

Intravesical mesothelin-based CAR T cells targeting MUC16 effectively control bladder cancer in preclinical models.

The Journal of experimental medicine·2026
Same journal

Flawed translation triggers oncogenic B-T cell communication.

The Journal of experimental medicine·2026
Same journal

Correction: LCK'ed in: Inborn errors of immunity in LCK reveal how TCR signaling is calibrated.

The Journal of experimental medicine·2026
Same journal

Mechanobiology of inflammation: Pulling the strings of innate immunity.

The Journal of experimental medicine·2026
Same journal

Bile acid retention in efferocytic macrophages shapes their inflammatory status during cholangitis.

The Journal of experimental medicine·2026
See all related articles

Related Experiment Video

Updated: Jun 19, 2026

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
08:03

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

Published on: December 7, 2021

THE CLASSIFICATION OF HEMOLYTIC STREPTOCOCCI.

R A Kinsella1, H F Swift

  • 1Medical Clinic of the Presbyterian Hospital, Columbia University, New York.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Hemolytic streptococci are a highly uniform group, showing identical behavior in complement fixation tests. This homogeneity simplifies their identification and study in immunological research.

More Related Videos

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
06:37

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source

Published on: February 7, 2013

Related Experiment Videos

Last Updated: Jun 19, 2026

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
08:03

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

Published on: December 7, 2021

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source
06:37

Staphylococcus aureus Growth using Human Hemoglobin as an Iron Source

Published on: February 7, 2013

Area of Science:

  • Microbiology
  • Immunology

Background:

  • Streptococci are a diverse group of bacteria with significant medical implications.
  • Understanding the homogeneity of specific streptococcal varieties is crucial for accurate diagnostics.

Purpose of the Study:

  • To investigate the homogeneity of the hemolytic variety of Streptococcus.
  • To assess the utility of complement fixation reactions in characterizing streptococcal strains.

Main Methods:

  • Analysis of the hemolytic variety of Streptococcus.
  • Utilizing complement fixation reactions with various streptococcal strains and antisera.

Main Results:

  • The hemolytic Streptococcus variety demonstrates remarkable homogeneity.
  • All studied strains exhibited nearly identical reactions in complement fixation tests across all antisera.

Conclusions:

  • The hemolytic Streptococcus is a uniform group, with minimal variation among strains.
  • Complement fixation is a highly effective method for confirming the homogeneity of hemolytic streptococci.