Medical Parasitology: Protozoa, Helminths, and Vectors
Protozoa
Protozoa are unicellular eukaryotic parasites classified mainly into amoebae, flagellates, apicomplexans, and ciliates.
- Motility: Pseudopodia (amoebae), flagella (flagellates), cilia (ciliates), and gliding (Apicomplexa).
- General stages: Trophozoite (active/feeding) and cyst/oocyst (resistant infective stage).
- Reproduction: Asexual via binary fission or schizogony; Apicomplexa also undergo sexual reproduction.
Amoebae
- Entamoeba histolytica: Intestinal amoeba; infective mature cysts are ingested
Taenia Solium and Cysticercosis: Symptoms and Prevention
General Characteristics of Cestodes
Cestodes are organisms with a body flattened dorsoventrally. They are variable in size and have no body cavity or digestive system; their nutrition is effected by osmosis. They are hermaphrodites and reproduce by eggs. They are commonly known by the name of Tapeworms.
Morphology
- Scolex: Features 4 suction cups and 2 botri.
- Rostellum: A fixed or retractable crown of hooks used for attachment.
- Strobile: The generation of proglottids (immature, mature, and gravid), which
Arthropod Classification: Classes, Characteristics, and Diversity
Diversity and Success of Arthropods
The most successful animals on the planet are the arthropods. They live on land, in the sea, and in the air, making up over three-fourths of all currently known living and fossil organisms—over 1 million species in all.
Arthropods exhibit a vast distribution, ranging from the deep sea to mountain peaks, and vary greatly in size, from the king crab with its 12-foot armspan to microscopic insects and crustaceans.
Key Characteristics of Phylum Arthropoda
- Arthropods
Four Key Areas of Second Language Acquisition Research
How Second Languages Are Acquired
There are four areas of investigation and debate among Second Language Acquisition (SLA) researchers that deserve special attention from English language teachers:
The Nature of Input
Input is what you receive: the amount of language you are exposed to. Learners receive input from ‘messages’ which contain language a little above their existing understanding and from which they can infer meaning. The hypothesis makes a distinction between acquiring a language and learning
Evolution of Special Education Concepts and Legislation in Spain
1. Historical Evolution of Special Education
1.1. General Precedents
Before the Middle Ages (Pre-15th Century)
Abnormalities often led to Infanticide. People were scared of those with differences and were highly superstitious. Parents of the child might feel shame. (It is still difficult today to accept that relatives have difficulties.) Furthermore, resources for support were nonexistent during this period.
The Middle Ages
Churches condemned individuals with abnormalities but often practiced exorcism,
Read MoreUnlocking Language Learning: Core Principles for Educators
Understanding Language Learning: Insights for Teachers
There are four key areas of investigation and debate among second language acquisition researchers that deserve special attention from English Language Teachers:
1. The Nature of Input
Input refers to what you receive, the amount of language you are exposed to. The Input Hypothesis posits that language is acquired when learners receive input from ‘messages’ which contain language slightly above their existing understanding, and from which they
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