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The word Agni is derived from three verbs – from 'going', from 'shining or burning', and from 'leading'. The letter "a" (अ) is from root "i" which means 'to go'. The letter "g" (ग्) is from the root "añj" meaning 'to shine' or "dah" meaning 'to burn'. And the last letter is by itself the root "nī" (नी) which means 'to lead'.<ref>Lakshman Sarup (1998). The Nighantu and the Nirukta. Motilal Banarsidass. p. 120. ISBN 978-81-208-1381-6. Available from https://en.wikipedia.org/wiki/Agni#cite_ref-31 accessed on 11-04-2020</ref>
The word Agni is derived from three verbs – from 'going', from 'shining or burning', and from 'leading'. The letter "a" (अ) is from root "i" which means 'to go'. The letter "g" (ग्) is from the root "añj" meaning 'to shine' or "dah" meaning 'to burn'. And the last letter is by itself the root "nī" (नी) which means 'to lead'.<ref>Lakshman Sarup (1998). The Nighantu and the Nirukta. Motilal Banarsidass. p. 120. ISBN 978-81-208-1381-6. Available from https://en.wikipedia.org/wiki/Agni#cite_ref-31 accessed on 11-04-2020</ref>
==Synonyms==
Anala, teja, ushma, vaishvanara.
==Contextual meanings==
The term agni denotes the following meanings:
#Agni mahabhuta
#Jatharagni, bhutagni and dhatvagni(factors responsible for digestion and metabolism at various levels)
#[[Pitta]] [[dosha]] ([[Chikitsa Sthana]] 03/39)
#Fire
#Body heat in the form of teja(Chakrapani on [[Chikitsa Sthana]] 26/132)
#Oja(essence of all [[dhatu]])([[Sutra Sthana]]28/04)
#Power(Su.Sa.Su. 15/36)
#Brightness ([[Sharira Sthana]] 04/37)
==Evolution==
In the sequence of evolution, [[agni]] evolves from the vayumahabhuta. Shabda, sparsha and rupatanmatra unify to form agnimahabhuta (su.sa.sa.01/04).
==Types of agni==
Agni is present in two forms. 1)Nitya (eternal) and 2) Anitya (ephemeral).<ref>Dingarilakshmanachary.Acharya’sAyurvedeeyapadarthavigyana. Delhi: Chaukhamba Sanskrit pratisthan;2012.Chapter09, Tejo nirupana;p.59.</ref>
The paramanu (most subtle) form of agnimahabhuta is eternal. The secondary forms derived from it are ephemeral.
The ephemeral form is observed as agni (factors responsible for heat, digestion and metabolism in body), darshanendriyadravya (subject matter for vision) and object of vision.
==General characteristics==
The substance with predominance of agnimahabhuta possesses following properties:
*Hot (ushna)
*Sharp (teekshna)
*Subtle (sukshma)
*Light (laghu)
*Dry (ruksha)
*Clear (vishada)([[Sutra Sthana]] 26/11)
*Rupa (vision) ([[Sharira Sthana]] 01/27)
==Specific character (lakshana)==
Ushnatva (heat) is the characteristic feature of agnimahabhuta.([[Sharira Sthana]] 01/29). Agni mahabhuta has dominance of sattva and rajas guna among the three fundamental qualities (triguna) (su.sa.sa.01/20).
==Importance==
Agni mahabhuta is one of the basic six constituents of [[purusha]] or holistic human being ([[Sharira Sthana]] 05/04). Agni is represented by heat in [[purusha]]([[Sharira Sthana]]05/05). Therefore it is responsible for all transformation processes in the body.
===Role in the formation of dhatu===
*The [[rakta]] [[dhatu]] has predominance of agnimahabhuta (su.sa.su.15/10). [[Artava]] (menstrual blood with ovum) also has agnimahabhuta dominance. Blood (rakta) present in the eyeball represents the agni mahabhuta (su.sa.ut.01/11).
*The constituents of [[vayu]], [[jala]] and agnimahabhuta together form [[mamsa]] [[dhatu]] (muscle tissue) in the body.([[Chikitsa Sthana]]15/29)
*The constituents of [[prithvi]], [[vayu]] and agnimahabhuta together form [[asthi]] [[dhatu]] (su.sa.su.15/10).
===Functions in embryogenesis and human body===
*During embryogenesis, agnimahabhuta carries out the functions of development of vision and its perception, digestion and warmth([[Sharira Sthana]] 04/12). Moreover, it is also responsible for colour perception, good complexion, glow, bravery, anger and quickness of action (Su.Sa. Sa.01/19).
*Agnimahabhuta is also responsible for dominance of [[Pitta]][[dosha]] in [[prakriti]] of an individual ([[Vimana sthana]] 08/95).
*Agnimahabhuta carries out the function of digestion and transformation (su.sa.sa.05/03).
*If tejamahabhuta is absent in eye during embryogenesis, it results in congenital blindness. The excessive tejamahabhuta results in yellowish discoloration.<ref>Shivprasad Sharma, editor. Astaangasamgraha by vridhavaagbata with SasilekhaCommentry. 3rd edition. Varanasi: Chowkhamba Sanskrit series office, 2012. Sarirastaana 02/53; p..</ref>
*The agnimahabhuta dominant substances produce daha(burning), paka(digestion), prabha(radiance), prakasha(luster) and varna(colour) ([[Sutra Sthana]] 26/11)
*All these functions are carried out in postnatal life too.
*Shukra (reproductive fluid) is formed from unification of [[vayu]], agni, [[prithvi]] and [[jala]] mahabhuta in equal proportion ([[Sharira Sthana]]02/04)
*The visual sensory system including eyes have predominance of tejas mahabhuta ([[Sutra Sthana]]08/14). Thus agnimahabhuta plays significant role in sight and its perception.
===Role in determining the complexion===
*The combination of tejadhatu, [[jala]] and [[akasha]] mahabhuta results in fair(gaura/avadatavarna) complexion ([[Sharira Sthana]]08/15).
*An equilibrium of all the five mahabhuta results in shyamavarna (sky-like bluish complexion ([[Sharira Sthana]]08/15).
===Marma (vital points) and its agnimahabhutaconstitution===
*The injury to [[sadyapranahara]][[marma]](vital points)causes instant death due to agnimahabhuta predominance. Hence agnimahabhuta is responsible for instant death. The injury to [[kalantarapranahara]][[marma]](vital points) also leads to death after some time, because of dominance of [[jala]]mahabhuta with agni. The qualities of j[[ala]]mahabhuta can pacify actions of agni for some time.
*[[Rujakara]][[marma]](vital points) have predominance of agni and [[vayu]]mahabhuta. Pain is caused as a result of these two mahabhuta (su.sa.sa.06/16).
==Importance in clinical practice==
===Application in diagnosis===
*Proper digestion, transformation, metabolic processes, heat production and thermal regulation etc. in the body is regulated by agnimahabhuta. Any abnormalities in these physiological functions are observed to assess proportion of agnimahabhuta. Excessive use of substances having agnimahabhuta predominance cause dizziness, burning pain, tremors, piercing and tearing pains ([[Sutra Sthana]]26/43).
===Application in treatment===
*The substances having light (laghu) property possess [[vayu]] and agnimahabhuta predominance. Intake of such food items increases agni (factors responsible for digestion) ([[Sutra Sthana]]05/06). The quantity of food is determined by inherent nature of food (light or heavy to digest) based upon fundamental panchabhautik composition and capacity of an individual.
*The [[pitta]] [[dosha]] is constituted from agnimahabhuta.<ref>Shivprasad Sharma, editor. Astaangasamgraha by vridhavaagbata with SasilekhaCommentry. 3rd edition. Varanasi: Chowkhamba Sanskrit series office, 2012. sutrasthana 20/02; p..</ref> In [[pitta]] [[prakriti]] individual, the dominance of properties of agnimahabhuta are observed.
*Similarly, in conditions of [[pitta]][[dosha]] aggravation, agnimahabhuta predominance is observed. The treatment of such conditions is done by avoiding diet and lifestyle measures with agni predominance.
*On the other side, the agnimahabhuta dominant regimen is indicated in conditions of [[vata]] and [[kapha]]dosha aggravation (su.sa.su.41/07-09).
*The substances which are sour, salty and pungent in taste have dominance of agnimahabhuta ([[Sutra Sthana]] 26/40). By wisely prescribing the drugs having above said tastes, one can treat various conditions of [[dosha]]s.
*Medicines for therapeutic emesis (vamana) have agni and [[vayu]]mahabhuta dominance. Since both of these mahabhutas have lightness as their property, it carries the [[dosha]] in upward direction and thus it helps in expelling the [[dosha]]s through mouth ([[Kalpa Sthana]] 01/05).
*The drugs having predominance of agnimahabhuta cause deepana (initiating digestion) and pachana(expediting digestion) effect in body (su.sa.su.41/06).
*Swedana (sudation) is achieved by applying principles of heat on body physiology. It liquifies morbid [[dosha]] and clears channels.
*To attain the scrapping (lekhana) effect, drugs having more [[vayu]] and agniguna predominance are selected(su.sa.su.41/06).
*In the event of reduction in [[rakta]](blood) in the body, the drugs having predominance of tejamahbhuta should be used (su.sa.su.15/10).
*Agni, [[vayu]] and [[akasha]] properties are used to cause apatarpana or langhana(emaciation).<ref>Harisaastriparaadakaravaidya, editor. Ashtaangahr’daya by Vaagbhat’a with Sarvaangasundara and Ayurvedarasaayana Commentary. 10rd edition. Varanasi: Chaukhambha Orientalia, 2011. Sutrasthana 14/03; p.223.</ref>
==Current views and researches==
The tanmatra form of all mahabhuta is eternal. During the evolution, the ‘indistinct’ (avyakta) acts as a seat for mass and energy. Due to the potential difference in the energy, elementary forces come into action and produce vibrations. These vibrations produce the sound potential i.e. first or shabdatanmatra. The vibrations further increase compelling the elementary forces to act vigorously and thus produce the touch potential or sparshatanmatra of vayumahabhuta. Once the vibrations increase, it may lead to collisions.This in turn results in the production of heat and light radiation potential.It is correlated to rupatanmatra of agni mahabhuta.<ref>Nalage D H. A study of Samskara and its role in alteration of Pancha-Bhautika composition of Dravya [MD Dissertation]. Jamnagar: Gujarat Ayurved University; 2004</ref>.
Agni mahabhuta being a conversion factor is placed in middle among the [[panchamahabhuta]]s. It has the capability to convert the [[akasha]] and [[vayu]]mahabhuta to [[jala]] and [[prithvi]]mahabhuta and vice versa. So it originates as the third mahabhuta during evolution.<ref>Gautam K. Critical study of “Bhutebhyohiparamyasmatnastichintachikitsite” w.s.r. to Santarpanotthaprameha& it’s management [MD Dissertation]. Jamnagar: Gujarat Ayurved University; 2007</ref>.
In quantum physics Bosons and Fermions are the two classes of elementary particles.Spin is an intrinsic property of these particles. They are basic building blocks of nature. These two particles differ in their spin, which result in fundamental differences in its behavior. Bosons have spin 0, 1 etc. and fermions have spin ½, 3/2 etc. The spin-1 force field (one among the five quantum mechanical spin types of a unified quantum field theory) is electromagnetism which is responsible for heat, chemical changes and light.<ref>Sharma H. Correlation of physiological principles of Ayurveda with spin types of quantum physics. Annals Ayurvedic Med [Internet]. 2018 [cited 2020 Apr 03];7(3-4):72-74. Available from: https://www.aamjournal.in/fulltext/70-1531160335.pdf</ref> Tejomahabhuta is responsible for heat, sight and transformations. Dr. JohnHagelin, leading physicist in the area of unified quantum field theory, thus correlates tejamahabhuta with the spin-1 force field.<ref>Hagelin.J. S. Is Consciousness the Unified Field? A Field Theorist’s Perspective. Modem Science and Vedic Science [Internet]. 1987 [cited 2020 Apr 03];7(1):29-87. Available from:https://www.psychicstudent.com/wp-content/uploads/hagelin.pdf</ref>.
A single cell of living organism has combination of five mahabhutas. The numerous metabolic activities taking place within the cell are governed by teja mahabhuta.<ref>Dr Kusum Malik, Dr Brijesh Mishra. Panchamahabhuta- Aadharbhut Siddhant and their application in Chikitsa. J Ayurveda Integr Med Sci 2018;5:146-150. http://dx.doi.org/10.21760/jaims.v3i5.13833</ref>.
==List of theses done==
#Upendra D. Dixit (1995). Concept of Panchmahabhuta& it’s utility in Chikitsa .
#Dr. Bishnupriya Mohanty (2004 Ph.D.) Biotransformation of Panchmahabhuta& it’s interpretation in terms of cell injury.
#Dwivedi L.D. (1969-M.D. and 1975-PhD).A study of concept of Panchmahabhutas
#Srivastav L. P. (1988).Concept of Panchmahabhutas in the light of Samkhya, Yoga & Ayurveda.
==More information==
[[Vatakalakaliya Adhyaya]] * [[Indriyopakramaniya Adhyaya]] * [[Katidhapurusha Sharira]]
==References==
==References==