A K SHARMA

R K MUKHERJI

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Effect of irradiation on adult nuclei in plants

Genetica

Bulbs and rhizomes of Nothoscordum fragrans, Haemanthus kalbreyeri, Zephyranthes mesochloa, Colocasia antiquorum, Zingiber officinale and Curcuma amada were irradiated at dosages of 250r and 500r, and the effect of irradiation was noted. 2. After forty-eight hours following treatment, heavy fragmentation, formation of micronuclei, structural alteration of chromosomes, lagging, etc. were observed in a large number of cases. 3. Frequency of fragments were found to be higher in treatment with 500r than with 250r dosage. This shows that the cells at different phages of interkinetic condition, in these species, become differentially affected following irradiation. This is in contrast to the previous report obtained with bulbs of Allium cepa, where all the interkinetic cells were found to be homogeneous as regards their response to irradiation is concerned. 4. It has been suggested that at the time of treatment, certain resting cells were lying at the last phase of interkinetic condition, that is, in a state just prior to germination. The enzymatic activity of these cells, necessary for germination, was completed at the time of treatment and so their germination capacity was not inhibited. In other young resting cells, however, the germination capacity was checked temporarily. 5. Fragments were found to be persisting after several days following irradiation. In Nothoscordum fragrans, fragments persisted even upto 2496 hours or one hundred and four days. Instead of assuming that fragments can remain ununited for such a long period, it has been suggested that possibly these fragments have passed through several cell generations, being included at random in the daughter cells and are on their way to degeneration. © 1959, Japan Mendel Society, International Society of Cytology. All rights reserved.

Fulltext

CYTOLOGIA

Experimental Study to Compare the Effect of X-Ray on the Somatic Chromosomes of a Few Species of Monocotyledons

Acta Radiologica

The Manner of Dependence of the “Permissible Dose” of Radiation on the Amount of Genetic Damage

Caryologia

Differenziazione Istologica Per Endopoliploidia Nelle Radici di Alcune Monocotiledoni

Journal of Heredity

THE NUCLEUS IN DIFFERENTIATION AND DEVELOPMENT

The American Naturalist

The Subdivision of the Chromosomes and their Multiplication in Non-Dividing Tissues: Possible Interpretations in Terms of Gene Structure and Gene Action

Greece and Rome

The Riddle of the Early Academy. By H. Cherniss. University of California Press and Cambridge University Press, 1945. Pp. 103. $1.50.

Journal	Genetica
Publisher	Martinus Nijhoff, The Hague/Kluwer Academic Publishers
ISSN	0016-6707