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Plasmodium falciparum.
Plasmodium falciparum.
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There are three types of human parasites: 1. Protozoa: Protozoa are single-celled organisms that can multiply in humans. These parasites can spread through contaminated food and water, person-to-person contact, and insect bites. Protozoa include Plasmodium malariae, which causes malaria infection, aRead more
There are three types of human parasites:
1. Protozoa: Protozoa are single-celled organisms that can multiply in humans. These parasites can spread through contaminated food and water, person-to-person contact, and insect bites. Protozoa include Plasmodium malariae, which causes malaria infection, and Cryptosporidium, which is ingestible.
2. Helminths: Helminths are parasitic worms that often root in a person’s digestive tract. These parasites cannot multiply or divide within a human body and eventually pass through a person’s stool. These include Ascaris lumbricoidesTrusted Source and hookwormTrusted Source parasites.
3. Ectoparasites: Ectoparasites are small organisms that live on the outside of the body. These include ticks, fleas, and lice.
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There are two types of host: 1. Definitive, and 2. Intermediate host.
There are two types of host:
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1. Definitive, and
2. Intermediate host.
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In biology and medicine, a host is a larger organism that harbours a smaller organism; whether a parasitic, a mutualistic, or a commensalist guest (symbiont). The guest is typically provided with nourishment and shelter.
In biology and medicine, a host is a larger organism that harbours a smaller organism; whether a parasitic, a mutualistic, or a commensalist guest (symbiont). The guest is typically provided with nourishment and shelter.
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Protozoa are divided into four major groups based on the structure and the part involved in the locomotion: 1. Mastigophora or Flagellated protozoans: They are parasites or free-living. They have flagella for locomotion Their body is covered by a cuticle or pellicle Freshwater forms have a contractiRead more
Protozoa are divided into four major groups based on the structure and the part involved in the locomotion:
1. Mastigophora or Flagellated protozoans:
They are parasites or free-living.
They have flagella for locomotion
Their body is covered by a cuticle or pellicle
Freshwater forms have a contractile vacuole
Reproduction is by binary fission (longitudinal division)
Examples: Trypanosoma, Trichomonas, Giardia, Leishmania, etc.2. Sarcodina or Amoeboids:
They live in the freshwater, sea or moist soil.
The movement is by pseudopodia. They capture their prey by pseudopodia
There is no definite shape and pellicle is absent
The contractile vacuole is present in the amoeboids living in freshwater
Reproduction is by binary fission and cyst formation
Examples: Amoeba, Entamoeba, etc.3. Sporozoa or Sporozoans:
They are endoparasitic.
They don’t have any specialised organ for locomotion
The pellicle is present, which has subpellicular microtubules, that help in movement
Reproduction is by sporozoite formation
Examples: Plasmodium, Myxidium, Nosema, Globidium, etc.4. Ciliophora or Ciliated protozoans:
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They are aquatic and move actively with the help of thousands of cilia.
They have fixed shape due to covering of pellicle
They may have tentacles, e.g. in the sub-class Suctoria
Contractile vacuoles are present
Some species have an organ for defence called trichocysts
They move with the help of cilia and the movement of cilia also helps in taking food inside the gullet
They reproduce by transverse division and also form cysts
Examples: Paramecium, Vorticella, Balantidium, etc.
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A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
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Fimbriae and flagella are both filamentous proteinaceous structures found on the surface of some bacterial cells, but they have different functions and structures. Fimbriae are bristle-like short fibers that occur on the surface of some Gram-positive and Gram-negative bacteria. Their main function iRead more
Fimbriae and flagella are both filamentous proteinaceous structures found on the surface of some bacterial cells, but they have different functions and structures. Fimbriae are bristle-like short fibers that occur on the surface of some Gram-positive and Gram-negative bacteria. Their main function is surface attachment, which enables the bacterial cell to stick to the surface of host cells. They also help in the formation of pellicles or biofilms.
Flagella, on the other hand, are long whip-like filamentous structures present in some bacteria. The most important function of flagella is to assist in locomotion. Flagella can also act as a sensory organ to detect temperature and the presence of certain chemicals in the external environment of the cell.
In summary, fimbriae are used for attachment while flagella are used for movement.
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Non-capsulated bacteria are bacteria that lack a capsule. A capsule is a protective outer covering on certain gram-negative and gram-positive bacteria that increases virulence. The capsule acts to prevent desiccation and phagocytosis. Bacteria without a capsule, or non-capsulated bacteria, include NRead more
Non-capsulated bacteria are bacteria that lack a capsule. A capsule is a protective outer covering on certain gram-negative and gram-positive bacteria that increases virulence. The capsule acts to prevent desiccation and phagocytosis. Bacteria without a capsule, or non-capsulated bacteria, include Neisseria, Corynebacterium, Salmonella, Shigella, Vibrio, Proteus, Pseudomonas.
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There are several methods that can be used to identify bacteria. Some of the most common methods include: 1. Microscopy: Bacteria can be observed under a microscope, where their shape, size, and arrangement can provide clues to their identity. 2. Culture: Bacteria can be grown in a laboratory on nutRead more
There are several methods that can be used to identify bacteria. Some of the most common methods include:
1. Microscopy: Bacteria can be observed under a microscope, where their shape, size, and arrangement can provide clues to their identity.
2. Culture: Bacteria can be grown in a laboratory on nutrient media, where their growth characteristics, such as colony morphology and color, can provide information about their identity.
3. Biochemical tests: Various biochemical tests can be performed on bacterial isolates to determine their metabolic capabilities and enzymatic activities, which can help identify the bacteria.
4. Serological tests: Serological tests can be used to detect specific antibodies or antigens associated with particular bacterial species.
5. Molecular methods: Molecular methods such as PCR and DNA sequencing can be used to identify bacteria based on their genetic material.
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symbiosis, any of several living arrangements between members of two different species, including mutualism, commensalism, and parasitism. Both positive (beneficial) and negative (unfavourable to harmful) associations are therefore included, and the members are called symbionts.
symbiosis, any of several living arrangements between members of two different species, including mutualism, commensalism, and parasitism. Both positive (beneficial) and negative (unfavourable to harmful) associations are therefore included, and the members are called symbionts.
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