கண்ணதாசனை பார்த்து நீ கவிஞனா? என கருணாநிதி கேட்டதற்கு கண்ணதாசன் எழுதிய கவிதையை பாருங்கள்...
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Saturday, August 12, 2023
கருணாநிதி கேட்டதற்கு கண்ணதாசன் எழுதிய கவிதை
Tuesday, August 8, 2023
Origin and history of Tamils
The origin and history of the Tamil people is a complex and fascinating topic that spans thousands of years. The Tamils are an ethnic group native to the Indian subcontinent, with a distinct language and culture. Here's an overview of their origin and historical journey:
Ancient Roots and Early Civilisation (Prehistoric to 3rd Century
BCE): The exact origins of the Tamils are challenging to pinpoint, but their
history dates back to prehistoric times. The region now Tamil Nadu,
located in southern India, has archaeological evidence of ancient
human habitation. The Sangam literature, a collection of Tamil poetic works,
offers insights into ancient Tamil society's social, economic, and cultural aspects. These works date from around 300 BCE to 300 CE and provide
valuable information about the lifestyle and beliefs of the early Tamils.
Chera, Chola, and Pandya Kingdoms (3rd Century BCE - 13th
Century CE): During this period, the Tamil region was characterised by three significant dynasties: the Cheras, the Cholas, and the Pandyas.
These dynasties engaged in trade, warfare, and cultural exchanges with other
parts of India and foreign civilisations, including the Romans and Southeast
Asian nations. The Cholas, in particular, established a vast maritime empire extending to present-day Southeast Asia.
Medieval Period (13th - 18th Century CE): The medieval
period saw the emergence of various empires and kingdoms, including the
Vijayanagara Empire, which had influence over Tamil Nadu. This era also
witnessed the arrival of various foreign powers, including Muslim sultanates
and later European colonial powers like the Portuguese, Dutch, and British. The
British East India Company gradually established control over different parts
of India, leading to significant changes in Tamil society and economy.
Colonial Rule and Modern Era (18th - 20th Century): Tamil
Nadu and the rest of India fell under British colonial rule during the
18th century. The British implemented various administrative and economic
changes that significantly impacted Tamil society. The 19th and early 20th
centuries saw the rise of social reform movements and political activism in
Tamil Nadu, with leaders like E.V. Ramasamy (Periyar) advocating for social
justice, equality, and the rights of lower-caste individuals.
Independence and Post-Independence Period (20th Century -
Present): India gained independence from British rule in 1947, forming the modern Indian state. Tamil Nadu has played a significant role
in Indian politics and culture, producing influential figures in various
fields. The region has also seen linguistic and cultural movements to preserve and promote the Tamil language and identity.
Throughout their history, the Tamils have contributed to
literature, art, science, and politics, leaving an indelible mark on the
cultural tapestry of India and beyond. Today, the Tamil people are spread
across various parts of India and other countries due to migration
and the Indian diaspora. They continue to celebrate their language, culture,
and traditions while adapting to the challenges of the modern world.
Thursday, August 3, 2023
"ஒரே ராகம்"கௌரி மனோகரி ராகத்தில் அமைந்த திரை இசைபாடல்கள்
Wednesday, August 2, 2023
Oxidation,Free Radicals and Antioxidants
Oxidation:
Oxidation is a chemical reaction in which a substance loses
electrons, becoming more positively charged. This process can occur when a
substance reacts with oxygen or other electronegative elements. The most common
example of oxidation is the rusting of iron when it reacts with oxygen in the
presence of moisture.
In living organisms, oxidation is a crucial
part of various physiological processes. For example, it is involved in the
breakdown of nutrients to release energy in cells. However, oxidation can also
lead to the production of harmful byproducts known as free radicals.
Free Radicals:
Free radicals are highly reactive molecules that contain
unpaired electrons. They are produced naturally in the body during normal
metabolic processes or can be generated due to external factors like pollution,
radiation, or unhealthy lifestyles (e.g., smoking). These free radicals are
unstable and can cause damage to cells and tissues by reacting with and
stealing electrons from other molecules in the body, leading to a chain
reaction of cellular damage.
Antioxidants:
Antioxidants are substances that can neutralize free
radicals by donating electrons without becoming unstable themselves. They act
as a defence system against the harmful effects of oxidative stress caused by
free radicals. Antioxidants play a crucial role in maintaining the overall
health and function of cells and tissues in the body.
The body has its own antioxidant defence system, including
enzymes like superoxide dismutase, catalase, and glutathione peroxidase, which
help counteract the harmful effects of free radicals. Additionally, many
antioxidants are obtained from the diet, including vitamins C and E,
beta-carotene, selenium, and various phytochemicals found in fruits, vegetables,
nuts, and seeds.
Importance of Antioxidants:
Having an adequate intake of antioxidants is important
because excessive free radicals can lead to oxidative stress, which has been
linked to various health issues, including:
Ageing: Oxidative stress is considered one of the
contributing factors to the ageing process.
Chronic Diseases: It has been associated with several
chronic diseases, such as heart disease, diabetes, cancer, and
neurodegenerative disorders like Alzheimer's and Parkinson's disease.
Inflammation: Oxidative stress can trigger inflammation,
which is involved in many diseases.
Cellular Damage: Oxidative stress can damage cellular
components like DNA, proteins, and lipids, impairing cell function
and potential mutations.
In summary, oxidation is a chemical reaction involving the
loss of electrons, and it can produce harmful free radicals. Antioxidants are
essential in neutralizing these free radicals and protecting the body from the
potential damage they can cause. Eating a balanced diet rich in antioxidants is
a key part of maintaining good health and reducing the risk of various diseases
associated with oxidative stress.
Wednesday, July 26, 2023
படித்து உருப்படாமல் போகிற வர்க்கம்
