المؤلفون: D. Chatterjee

المصدر: Nature. 160:234-237

مصطلحات موضوعية: Multidisciplinary, Oryza sativa, biology, Tropical agriculture, business.industry, food and beverages, Tropics, Oryza glaberrima, Oryza, biology.organism_classification, Agriculture, Botany, Taxonomy (biology), Domestication, business

الوصف: ALTHOUGH much work has been done on the widely cultivated species of rice (Oryza sativa Linn.) for its improvement as an agricultural crop, it must be admitted that our knowledge of its morphology and taxonomy and its relationship to other wild species of the genus is comparatively meagre. The term ‘wild rice’ as employed here is used to indicate all other species which conform by their technical characters to the generic definition of Oryza, and which grow spontaneously in a wild state. The two cultivated species are the well-known Oryza sativa Linn, and the less known Oryza glaberrima Steud. (cultivated in west tropical Africa). In tropical countries where these species are extensively cultivated, it is unfortunate that a comprehensive account of the rice plant with a proper interpretation of al the structures, its evolution and domestication by man is not generally given in text-books on botany and tropical agriculture. This omission makes its study uninteresting and often vague. The aim this note is to put together some of these much-needed data with a suitable list for further reference.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::344293b152cb26ba283c34d3a33cc4e9Test
https://doi.org/10.1038/160234a0Test

المؤلفون: D. Chatterjee

المصدر: Nature. 161:362-364

مصطلحات موضوعية: Multidisciplinary

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::a44495a6ab1304d525352a56ef00ade1Test
https://doi.org/10.1038/161362a0Test

المؤلفون: Partha Banerji, S. D. Chatterjee

المصدر: Nature. 211:511-512

مصطلحات موضوعية: Atmosphere, Radium, Multidisciplinary, Atmosphere of Earth, chemistry, Radiochemistry, Radioactive waste, chemistry.chemical_element, Environmental science, Spallation, Radon, Cosmic ray, Rainwater harvesting

الوصف: ATMOSPHERIC radioactivity is generally attributed to the following: (1) escape of radon and thoron into the air from radioactive material in the surface of the Earth; (2) spallation products of atmospheric gases produced by cosmic radiation; (3) radioactive fall-out as a consequence of nuclear detonations.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::ee168f44a4541d147657003616436870Test
https://doi.org/10.1038/211511a0Test

المؤلفون: Partha Banerji, S. D. Chatterjee

المصدر: Nature. 204:1185-1186

مصطلحات موضوعية: Radium, Multidisciplinary, Fine grain, Filter paper, chemistry, Content (measure theory), Ionization chamber, Environmental science, chemistry.chemical_element, Mineralogy, Radon, Scaling, Rainwater harvesting

الوصف: IN recent years, interest has been renewed in the measurement of the radon content of the atmosphere1–4. In most cases, samples of air were drawn through fine grain filter papers and the activity of the filter-paper samples, corresponding to radium A, B and C, was afterwards estimated by a suitable Geiger–Muller counter and scaling system. It was, however, found that the filter paper method had a low collection efficiency of only 2–3 per cent as compared with the less equivocal ion chamber method1. Furthermore, Běhounek and Majerova5 reported that there was no reason for assuming the ratio between the two measurements to be constant.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::677d73289cbbd5c7d4c2df9371159833Test
https://doi.org/10.1038/2041185c0Test

المؤلفون: D. Chatterjee

المصدر: Nature. 160:387-388

مصطلحات موضوعية: Multidisciplinary, History, Central government, Economic history, Retrenchment, Sister, Shadow (psychology)

الوصف: PROF. MUNRO FOX1 has recently given an admirable account of the Zoological Survey of India. This department has had a glorious past when viewed in the light of scientific achievements; but as the result of various restrictions of the Central Government in India, its activities during the past fifteen or twenty years have only been a shadow of those which preceded them. Its sister department—the Botanical Survey of India—has also suffered from lack of funds and retrenchment of staff, and at present is in a far worse condition than the Zoological Survey.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::231e285a95b131490077798791f634fbTest
https://doi.org/10.1038/160387a0Test

المؤلفون: J. N. Mukherjee, B. D. Chatterjee

المصدر: Nature. 155:85-86

مصطلحات موضوعية: chemistry.chemical_compound, Multidisciplinary, Titration curve, Chemistry, Inorganic chemistry, Silicic acid, Electrochemistry, Alkali metal, Ion

الوصف: THE properties of silicic acid sols have been studied by several investigators1–10. Differences of opinion1,2,3 have been expressed as to whether the sols possess any intrinsic acid character. In a number of publications from this laboratory the interactions of silicic acid sols with bases11,12,13,14, neutral salts15,16 and acids17,18 have been discussed. The sols even after purification by prolonged electro-dialysis have free acidities of the order of 10–4 N. Their ultra-filtrates have a practically neutral reaction showing that mobile H+ ions associated with the continued buffer action beyond the first inflexion point takes place, and a second inflexion (Fig. 2) between PH 11·0 and 11·7 corresponding to the formation of NaHSiO3 is observed13. An inflexion at pH 11·8 in the titration curves of silicic acid sol with concentrated alkali has been observed by Tread-well and Konig4.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::f7d68964e0adb32591c3a72ed4e4b3ddTest
https://doi.org/10.1038/155085a0Test

المؤلفون: D. Chatterjee

المصدر: Nature. 158:490-490

مصطلحات موضوعية: Typhonium, Multidisciplinary, Amorphophallus, Geography, biology, Genus, Botany, Pothos, Arisaema, biology.organism_classification, Araceae, Colocasia, Cedrus

الوصف: THE arum family (Araceae) is well represented in tropical parts of the world, and, in India, genera like Colocasia, Alocasia, Typhonium, Amorphophallus and Pothos belonging to this family are commonly found. Some of these genera are associated with the hydrophytes and others form constituent plants of the secondary vegetation of the ‘terai’ forests or the foothill vegetation of the Himalayas. The ‘terai should be regarded ecologically as the real tropical rain forest. The arum family as a whole, therefore, comprises plants which are not found in high altitudes in India in places like Simla, Darjeeling or Sikkim. We are apt to think of plants like lofty Magnolias, Cedrus, Quercus, Rhododendrons and other plants like Primulas, Gentiana and Senecioswhen we imagine the vegetation at high altitudes in the Himalayas. An exception to this is the interesting and fascinating genus Arisœma belonging to the arum family. The species of this genus are always found in high hills and some reach altitudes of 15,000 ft. (5,000 m.) in the Sikkim Himalayas.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0449160701140d27780783684664b559Test
https://doi.org/10.1038/158490a0Test

المؤلفون: D. CHATTERJEE

المصدر: Nature. 160:757-757

مصطلحات موضوعية: Multidisciplinary

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::36a568115cc6a758ac8a219984f21a4cTest
https://doi.org/10.1038/160757a0Test

المؤلفون: D. Chatterjee

المصدر: Nature. 162:703-703

مصطلحات موضوعية: Multidisciplinary, Herbarium, biology, Inflorescence, Ustilago, Botany, Smut, Microchloa indica, Type specimen, New delhi, Microchloa, biology.organism_classification

الوصف: RECENTLY, Dr. H. F. Mooney collected some grasses from the sandy soil around Angul, Orissa. These were sent to me in the ordinary way for naming at Kew. The specimens were 4–7 cm. high, and were peculiar in that each stem terminated in a dark fruit-like swelling. These were due to a smut Ustilago microchloae Syd. et Butler, the host plant being Microchloa indica (Linn, f.) Beauv. (syn. Microchloa setacea R. Br.). As no material of the smut was available for comparison at the Kew Herbarium or at the Commonwealth Mycological Institute, Kew, a request was sent to Stockholm for a loan of the type specimen in Sydow‘s herbarium. This was made available through the courtesy of Dr. Arwidsson of the Naturhistoriska Riksmuseet, and the provisional identification of Ustilago microchloae was confirmed. A point of interest in this smut is that the whole inflorescence, which is usually 5–7 cm. long in normal plants, is replaced by one fruit-like ovoid body of only 2 mm. in diam. This is packed with soot-like smut spores. By further correspondence I was able to secure additional specimens which are being distributed to Kew, New Delhi, Stockholm, Paris, Farlow Herbarium, Cambridge, Mass., and the U.S. Department of Agriculture, Washington, D.C.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0bdfdb1ae7a255b302a36275ccb6b9b8Test
https://doi.org/10.1038/162703a0Test

المؤلفون: D. Chatterjee

المصدر: Nature. 158:345-345

مصطلحات موضوعية: Type species, Multidisciplinary, biology, Genus, Botany, Zanonia, Type genus, biology.organism_classification, Cucurbitaceae, AKA

الوصف: AN interesting plant was discovered in Assam in 1883 by the late Gustav Mann. Later, Mr. I. H. Burkill found it in Abor Hill during his expedition in 1911 and 1912 (Burkill, No. 37363 and 37742). After a lapse of twenty-two years, Dr. N. L. Bor again found the plant in April 1933 at a place called Painjuli, Aka Hills. Mann's sheets were examined at Kew by the late C. B. Clarke, who thought this to be a new species of Zanonia.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::5a0fbaffc171159db2fe456a4e62018eTest
https://doi.org/10.1038/158345b0Test