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P. C. Datta

Bio: P. C. Datta is an academic researcher from University of Calcutta. The author has contributed to research in topics: Bark & Pharmacognosy. The author has an hindex of 7, co-authored 28 publications receiving 173 citations.

Papers
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Journal ArticleDOI
TL;DR: This procedure was found to be more generally applicable to angiosperms than carmine, applied in propionic-lactic acid mixtures.
Abstract: Pollen tubes passing through the style are fixed in acetic-alcohol (1 : 1) at 60 C for 30 min; softened by boiling in water 5–30 min; cleared in lactic acid at 60 C, 30 min; stained in lactophenol-cotton blue (1%) at 60 C, 15–30 min; and mounted in lactic acid. This procedure was found to be more generally applicable to angiosperms than carmine, applied in propionic-lactic acid mixtures. It has been tested on 36 species, including 4 monocotyledons and 32 dicotyledons.

12 citations

Journal ArticleDOI
TL;DR: Cytological informations of the family Meliaceae suggest 9, 10, 11, 12, 13 and 14 as basic numbers for Melieae or Trichilieae, while Cedreleae show a wide range of variation 12×2 to 14×4 and a highly advanced chromosome morphology.
Abstract: Cytological informations of the family Meliaceae suggest 9, 10, 11, 12, 13 and 14 as basic numbers. Numbers have evolved from lower to higher. In Melieae 14 is the basic number. In old Trichilieae the numbers are 9-14, which show different ploidy levels, including aneuploids. Carapa and Xylocarpus are similar in karyology and should be placed as Carapeae near Swietenieae, not with Melieae or Trichilieae. Cedreleae show a wide range of variation 12×2 to 14×4 and a highly advanced chromosome morphology. Calodecaryia (some species), Azadirachta, Dysoxylum, Aphanamixis, Aglaia, Amoora, Sandoricum are primitive and Naregamia, Nymania, Calodecaryla (some species), Lansium, Carapa, Xylocarpus, Capuronianthus, Swietenia, Cedrela and Toona are advanced.

8 citations

Journal ArticleDOI
01 Jan 1976
TL;DR: In this article, the Bark Drugs of Plumeria are described and compared to other Bark drugs of the 1970s and 1980s. Quarterly Journal of Crude Drug Research: Vol. 14, No. 3, No 3, pp. 129-142.
Abstract: (1976). Bark Drugs of Plumeria. Quarterly Journal of Crude Drug Research: Vol. 14, No. 3, pp. 129-142.

7 citations

Journal ArticleDOI
TL;DR: This investigation on populations of A. paniculata revealed 13 chromosomal biotypes, the analysis of which helped in having a tentative idea of the path of geographical migration of the species in India and Bangladesh.
Abstract: Use of herbal and natural ancient medicines is gaining a gradual popularity, instead of isolated or synthesized compounds for their side effects and many hazards . But the discoveries of different genotypes, cytotypes, chemical races etc. raised the question of selecting the most suitable ones. Andrographis paniculata (Burm. f.) Nees, highly valued throughout the world as a liver toner, has a wide distribution, covering highly varying climatic and edaphic condi tions. Naturally the possibility of discovering chromosomally distinguishable gentotypes in different populations and finally graduating such genotypes according to yield of medicinal compounds was worth exploring. Chromosome study offers a quick way of recognizing genotypes, if the chromosomes show detectable structural or numerical difference which may arise by addition, deletion, translocation, transposition, fragmentation, aneuploidy, euploidy etc. (Spurna et al. 1981), e.g., Scilla (Sato 1942), Datura fastuosa (Bhaduri and Sharma 1946), Lathyrus sativus (Datta 1955), Ipomoea quamoclit (Sharma and Datta 1958), Lathyrus odoratus (Sharma and Datta 1959), Adhatoda vasica (Datta and Maiti 1968a), Centella asialica (Datta and Maiti 1968b), Capsicum annuum (Datta 1968), Abelmoschus esculentus (Datta and Naug 1968), Cajanus cajan (Datta and Deb 1970), etc. This investigation on populations of A. paniculata revealed 13 such chromosomal biotypes, the analysis of which helped in having a tentative idea of the path of geographical migration of the species in India and Bangladesh.

7 citations


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Book
10 Dec 2010
TL;DR: In this paper, the authors present a survey of eudicots: sapindales, cucurbitales, myrtaceae, and myrithaceae. And they propose a new genus named myrtium.
Abstract: Perp. punya vol. X. Flowering plant, eudicots : sapindales, cucurbitales, myrtaceae. Perp.punya: 1eks.

2,989 citations

Journal ArticleDOI
01 Apr 1998-Blood
TL;DR: It is concluded that flavopiridol greatly influences apoptosis in both normal and malignant hematopoietic tissues, and provides compelling evidence for the use of flavopirs in human hematologic malignancies.

248 citations

Journal ArticleDOI
TL;DR: Recommendations addressing extraction process, tissue culture, and adventitious rooting techniques and propagation under abiotic stress conditions for improvement of phytoconstituents are discussed concisely in this paper.
Abstract: As aboriginal sources of medications, medicinal plants are used from the ancient times. Andrographis paniculata is one of the highly used potential medicinal plants in the world. This plant is traditionally used for the treatment of common cold, diarrhoea, fever due to several infective cause, jaundice, as a health tonic for the liver and cardiovascular health, and as an antioxidant. It is also used to improve sexual dysfunctions and serve as a contraceptive. All parts of this plant are used to extract the active phytochemicals, but the compositions of phytoconstituents widely differ from one part to another and with place, season, and time of harvest. Our extensive data mining of the phytoconstituents revealed more than 55 ent-labdane diterpenoids, 30 flavonoids, 8 quinic acids, 4 xanthones, and 5 rare noriridoids. In this review, we selected only those compounds that pharmacology has already reported. Finally we focused on around 46 compounds for further discussion. We also discussed ethnobotany of this plant briefly. Recommendations addressing extraction process, tissue culture, and adventitious rooting techniques and propagation under abiotic stress conditions for improvement of phytoconstituents are discussed concisely in this paper. Further study areas on pharmacology are also proposed where needed.

226 citations

Book ChapterDOI
TL;DR: Several different estimates of polyploid frequency in angio-sperms have been made, including Stebbins’ figure, first published in 1950, and suggestions by M.J. Grant in 1963, which included the only estimate I have encountered of Polyploidy in each of the two subclasses of angiosperms.
Abstract: Several different estimates of polyploid frequency in angio-sperms have been made, including G.L. Stebbins’ (1,2) figure, first published in 1950, of 30–35%, and suggestions by M.J.D. White in 1942 (3) of at least 40%, and by Grant in 1963 (4) of 47%. These figures represent different ways of calculating Polyploidy and different interpretations of the meaning of the word in the context of plant systematics. Stebbins’ estimate includes as polyploid those species which have gametic chromosome numbers that are multiples of the basic diploid number found in their genus, in other words, intrageneric Polyploidy. White’s figure is based on the simple observation that even haploid numbers exceed odd by about 40% and he thus assumed this 40% to be largely attributable to a polyploid origin. Grant postulated that species with haploid numbers in excess of n=13 would mainly be polyploid and those with n=13 or less, predominantly diploid. Grant’s study also included the only estimate I have encountered of Polyploidy in each of the two subclasses of angiosperms. He calculated a frequency of 43% in Dicotyledonae and a much higher 58% in Monocotyledonae. These figures were based on chromosome data accumulated by 1955 for some 17,138 species.

188 citations

Journal ArticleDOI
TL;DR: Phylogenetic analyses of Meliaceae, including representatives of all four currently recognized subfamilies and all but two tribes, indicate a close relationship between Aglaieae and Guareeae and a possible monophyletic origin of Cedreleae of Swietenioideae.
Abstract: Phylogenetic analyses of Meliaceae, including representatives of all four currently recognized subfamilies and all but two tribes (32 genera and 35 species, respectively), were carried out using DNA sequence data from three regions: plastid genes rbcL, matK (partial), and nuclear 26S rDNA (partial). Individual and combined phylogenetic analyses were performed for the rbcL, matK, and 26S rDNA data sets. Although the percentage of informative characters is highest in the segment of matK sequenced, rbcL provides the greatest number of informative characters of the three regions, resulting in the best resolved trees. Results of parsimony analyses support the recognition of only two subfamilies (Melioideae and Swietenioideae), which are sister groups. Melieae are the only tribe recognized previously that are strongly supported as monophyletic. The members of the two small monogeneric subfamilies, Quivisianthe and Capuronianthus, fall within Melioideae and Swietenioideae, respectively, supporting their taxonomic inclusion in these groups. Furthermore, the data indicate a close relationship between Aglaieae and Guareeae and a possible monophyletic origin of Cedreleae of Swietenioideae. For Trichilieae (Melioideae) and Swietenieae (Swietenioideae) lack of monophyly is indicated.

112 citations