astronomy

Tilak Weerasooriya

Tilak Weerasooriya is a astronomy 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 Tilak Weerasooriya rather than just read about it. In short: Tilak Richard Weerasooriya (Sinhala :තිලක් රිචඩ් වීරසූරිය) (20 November 1950 – 20 February 2022) was a Sri Lankan physician, academic, and professor emeritus. He was a pioneer in the field of Andrology in Sri Lanka.

Key takeaways

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

Reference excerpt

Tilak Richard Weerasooriya (Sinhala :තිලක් රිචඩ් වීරසූරිය) (20 November 1950 – 20 February 2022) was a Sri Lankan physician, academic, and professor emeritus. He was a pioneer in the field of Andrology in Sri Lanka. He served as Dean of the medical faculties at the University of Ruhuna Faculty of Medicine and the General Sir John Kotelawala Defence University, becoming the only Sri Lankan medical academic to lead two medical faculties, as per a SLJMS appreciation. He was also a Senior Lecturer - University of Peradeniya (Anatomy - Faculty of Medicine), and Deputy Vice Chancellor (Academic) - Kotelawala Defence University. During his career, Weerasooriya established Sri Lanka’s first andrology clinic, a diagnostic semen laboratory, a sperm bank with a donor insemination programme, and the National IVF Laboratory at Mahamodara Hospital, Galle, to support clinical services, research, and training. He helped establish the Faculties of Medicine at Rajarata and KDU.

Biography Weerasooriya was born on 20 November 1950, in Gampola, to Maurice Weerasooriya (1907–1990), Chief Education Officer, and Emily Weerasooriya (1926–2017). He had 4 siblings, Nandani, Nisala, Deepa and Asoka Weerasooriya. He attended Richmond College, Galle for his primary & secondary education, and later entered the University of Peradeniya where he obtained his MBBS in 1977. After completing his MBBS at the University of Peradeniya, Weerasooriya later joined Kyushu University's Department of Anatomy, Fukuoka, in the island of Kyushu in Japan, in order to obtain his PhD. His PhD was on the Micro vasculature of the testis, using electron microscopy. He specialised in Andrology. Specialising in andrology, he is credited as Sri Lanka’s pioneer andrologist. He established the country’s first andrology clinic, a diagnostic semen laboratory, and a sperm bank with a donor-insemination programme, and helped set up the National IVF Laboratory at Mahamodara Hospital, Galle, to support clinical services, research, and training. Weerasooriya died on 20 February 2022, aged 71.

Personal life Tilak married Mirani Weerasooriya in 1980, they had three children; Senal, Sahan and Semali.

Selected publications Weerasooriya, Tilak R., and Torao Yaniamoto. "Three-dimensional organisation of the vasculature of the rat spermatic cord and testis." Cell and tissue research 241.2 (1985): 317–323. T.R. Weerasooriya, & Wattage, A. P. P. (1997). An analysis of the pregnancies that occurred following in-utero insemination. Ilayperuma, I., W. D. Ratnasooriya, and T. R. Weerasooriya. "Effect of Withania somnifera root extract on the sexual behaviour of male rats." Asian Journal of Andrology 4.4 (2002): 295–298. Weerasooriya, Tilak R. "Laboratory assistance in the management of infertility." (1997). Fernando, L., J. Gromoll, T. R. Weerasooriya, E. Nieschlag, and Manuela Simoni. "Y‐chromosomal microdeletions and partial deletions of the Azoospermia Factor c (AZFc) region in normozoospermic, severe oligozoospermic and azoospermic men in Sri Lanka." Asian journal of andrology 8, no. 1 (2006): 39–44. Weerasooriya, M. V., T. R. Weerasooriya, N. K. Gunawardena, W. A. Samarawickrema, and E. Kimura. "Epidemiology of bancroftian filariasis in three suburban areas of Matara, Sri Lanka." Annals of Tropical Medicine & Parasitology 95, no. 3 (2001): 263–273. Weerasooriya, M. V., E. Kimura, D. A. Dayaratna, T. R. Weerasooriya, and W. A. Samarawickrema. "Efficacy of a single dose treatment of Wuchereria bancrofti microfilaria carriers with diethylcarbamazine in Matara, Sri Lanka." The Ceylon Medical Journal 43, no. 3 (1998): 151–155. Karunarathne, Y. A. U. D., L. D. A. M. Arawwawala, A. P. G. Amarasinghe, T. R. Weerasooriya, and U. K. A. Samarasinha. "Physicochemical, phytochemical, and nutritional profiles of root powder of Asparagus racemosus (Willd) of Sri Lankan origin." Asian J. Pharmacogn 3, no. 3 (2019): 29–35. Ilayperuma, I., W. D. Ratnasooriya, and T. R. Weerasooriya. "Methanol and water extracts of Withania somnifera roots has no abortifacient effect in rats." (2002). T.R Weerasooriya, and I. M. R. Goonewardene. "Sperm preparation and in utero insemination in the management of subfertility." Ceylon Medical Journal 41 (1996): 54–56. Fernando, H. H. L. K., R. Senevirathne, and T. R. Weerasooriya. "Can varicocelectomy Improve the Seminal Fluid Parameter Abnormalities?." (2012). Fernando, H. H. L. K., R. Senevirathne, P. M. Rodrigo, and T. R. Weerasooriya. "Can Clomiphene Citrate Improve the Quality of Seminal Fluid Parameters in Idipathic Oligoasthenoteratozoospermic Males." (2014). WEERASOORIYA, TR, and T. YAMAMOTO. "POSTNATAL-DEVELOPMENT AND THE 3-DIMENSIONAL ORGANIZATION OF THE TESTICULAR LYMPHATICS IN THE RAT." In JOURNAL OF ELECTRON MICROSCOPY, vol. 35, no. 1, pp. 95–95. WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP: OXFORD UNIV PRESS UNITED KINGDOM, 1986. Fernando, L., J. Gromoll, T. R. Weerasooriya, E. Nieschlag, and S. Simoni. "Frequency of Y-chromosome microdeletions and partial deletions of AZFc region in normozoospermic, severe oligozoospermic and azoospermic groups in Sri Lanka." In INTERNATIONAL JOURNAL OF ANDROLOGY, vol. 28, pp. 92–92. COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA: WILEY-BLACKWELL, 2005. Amarasinghe, D. M. Y., T. R. Weerasooriya, and I. M. R. Goonewardene. "Oocyte cryopreservation-a cost effective method."

References

Illustrations

Worked examples

Example 1 — a first encounter with Tilak Weerasooriya

Start with the simplest possible case. Write down what Tilak Weerasooriya claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Tilak Weerasooriya 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 Tilak Weerasooriya 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 Tilak Weerasooriya

In research: Tilak Weerasooriya appears in astronomy 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 Tilak Weerasooriya 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: Tilak Weerasooriya is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950 births, 2022 deaths, 20th-century Sri Lankan medical doctors, so understanding it makes those chapters shorter.
In everyday life: Look for Tilak Weerasooriya 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 Tilak Weerasooriya in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tilak Weerasooriya 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.
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Frequently asked questions

What is Tilak Weerasooriya in simple terms?

Why does Tilak Weerasooriya matter?

Because it connects several astronomy 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 Tilak Weerasooriya?

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 Tilak Weerasooriya.