science

Isao Ijima

Isao Ijima is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Isao Ijima rather than just read about it. In short: Isao Ijima (飯島魁, Iijma Isao; July 24, 1861 – March 14, 1921) was a Japanese zoologist known for his studies of sponges (Porifera) — including his circumscription of the genus Staurocalyptus — leeches (Hirudinea), flatworms (Turbellaria), birds, and fish. Professor of Zoology at Tokyo Imperial University, he is considered the founder of parasitology in Japan and was the first President of the Ornithological Society o…

Key takeaways

Isao Ijima belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Isao Ijima to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Isao Ijima from memory before moving on to harder problems.

Reference excerpt

Isao Ijima (飯島魁, Iijma Isao; July 24, 1861 – March 14, 1921) was a Japanese zoologist known for his studies of sponges (Porifera) — including his circumscription of the genus Staurocalyptus — leeches (Hirudinea), flatworms (Turbellaria), birds, and fish. Professor of Zoology at Tokyo Imperial University, he is considered the founder of parasitology in Japan and was the first President of the Ornithological Society of Japan. Taxa named in his honour include Ijima's sea snake and Ijima's leaf warbler.

Biography Born in Hamamatsu in 1861 into a samurai family of Hamamatsu Domain, at the age of fifteen he entered the Kaisei Gakkō school in Tokyo, before enrolling as a student in the Science College at the Imperial University, Tokyo in 1878. There he studied under Edward Sylvester Morse and Charles Otis Whitman. In 1879, together with Sasaki Chūjirō, both having previously received training from and assisted Morse in his exploration of the Ōmori Shell Mounds, Ijima excavated the Okadaira Shell Mound; this is credited with being the first modern archaeological survey conducted solely by Japanese. Upon graduation in 1881, as one of three from the first cohort in the Department of Zoology, he became an assistant in the College. The next year he went to Germany to study zoology at the University of Leipzig, where he spent three years working under the direction of Doctor Rudolf Leuckart; he was awarded his Ph.D. in 1884. Returning to Japan in 1886, at the age of 25 he was appointed Professor of Zoology at the Imperial University, Tokyo, where he remained until his death. In 1893, with the description of Parus owstoni (now Sittiparus owstoni or Owston's tit), he became the first zoologist from Japan to describe a bird. In 1903, he was involved in the establishment of Sakai Aquarium and in 1904 he was appointed the second director of the Misaki Marine Biological Station. In 1912, he was the founding president of the Ornithological Society of Japan. In 1918, he published his influential A Manual of Zoology (動物学提要, Dōbutsu-gaku Teiyō). In his personal life, Ijima enjoyed hunting, shooting, fishing, wine, and smoking a pipe. He died in 1921.

Illustrations

Worked examples

Example 1 — a first encounter with Isao Ijima

Start with the simplest possible case. Write down what Isao Ijima claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Isao Ijima before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Isao Ijima ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Isao Ijima

In research: Isao Ijima appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Isao Ijima in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Isao Ijima is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1861 births, 1921 deaths, Academics from Hamamatsu, so understanding it makes those chapters shorter.
In everyday life: Look for Isao Ijima outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Isao Ijima in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Isao Ijima means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Isao Ijima out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Isao Ijima in simple terms?

Why does Isao Ijima matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Isao Ijima?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Isao Ijima.