The Meselson Stahl Experiment - Biology

The three hypothesis of Dna replication were evaluated by Mathew Meselson and Franklin Stahl of the California Institute of Technology in 1958.       The grew bacteria in a medium containing heavy isotope of nitrogen, N15 which became incorporated into the bases of the bacterial DNA.       After several generations, the DNA of these bacteria denser than that of bacteria grown in a medium containing the isotope of nitrogen, N14        Meselson and Stahl then, tranferred the bacteria...

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Biosphere

Biosphere is a thin layer of earth in which all living organism exist. Organisms within the biosphere not only adapt to the environment but also interact to modify and control chemical and physical conditions of the biosphere. An organism lives in a habitat.     Biosphere is spread out over the surface of planet earth extending about 8/10 kilometers in the upper reaches of atmosphere and also in same distance into the depths of oceans.     An organism responds to a variety of environment factors, and only when...

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Migration to Abyssinia

The hardships and suffering of the Muslims increased. The Holy Prophet therefore, gave permission to a group of Muslims to migrate to Abyssinia. Accordingly in the fith year of prophethood, a group of eleven men and four women secretly left Abyssinia. These included Hazrat Usman and his wife Ruqayya, daughter of the Holy Prophet (P.B.U.H). Then followed another group of seventy-nine men and seven women including Hazrat Jafar, son of Abu Talib.        Najashi, the Christian king of Abyssinia treated the Muslims with...

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Preaching By The Holy Prophet (P.B.U.H)

The revelations stopped for some time. The Holy Prophet passed this time in restlessness and anxiety, until one day, he saw angel Jibrael again, in the sky seated on a chair. The Holy Prophet became frightened and rushed home. He asked Khadija to cover him up. She covered him up, after which he received another revelation which said:     "O thou wrapped up (in a mantle)!Arise and deliver thy warning!And thy Lord do thou magnify." (74: 1-3)    In obedience to the command of Allah, the Holy Prophet invited his friends...

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Call to Prophethood - Life of Makkah

With age and growing understanding Hazrat Muhammad became more aware of the corrupt society around him and it disturbed him greatly. He could not believe the polytheistic ideas of the pagans of Makkah and often thought of God of his forefathers, Ibrahim and Ismail. He did not follow any particular method of worship, beacuse he was not aware of any, but he realized that there is a force of truth beyond this world which must have power and control over the whole universe.    A few years before the conferment of prophethood, he became...

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Fruit Set & Fruit Ripening

Germinating pollen grain is not only in important structure for safe transfer of gametes and insurance for fertilization but also a rich source of auxis as well as commonly stimulating the tissues of the style and ovary to produce move auxin. This auxin is necessary for fruit set i.e. retention of the ovary, which becomes the fruit after fertilization. Without it abscission of flowers normally occurs, leading to low fruit yields.Fruit Ripening:      After fertilization the ovary and the ripe seeds continue to produce auxins...

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Fixing of Black Stone (Hajra al-Aswad) - Holy Prophet (P.B.U.H)

 The Ka'abah is situated at the lowest part in the valley of Faran and was always flooded by rain water. The people of Makkah tried various methods to stop this flooding. But all their efforts failed and the building was damaged by floods. They therefore, deciced to rebuild it. The task of rebuilding the Ka'abah was divided among the leading families of Makkah and the work was completed in harmony, without any dispute. But when the time came to place the black stone or Hajr -al- Aswad in its proper place, a dispute arose among...

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