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Distinguishing celadonite from glauconite for environmental interpretations:a review

Journal of Palaeogeography 2023年第2期12卷 179-194页

作者： Pragya Singh Santanu Banerjee Tathagata Roy Choudhury satadru bhattacharya Kanchan Pande Department of Earth Sciences Indian Institute of Technology BombayPowaiMumbai400076India Space Applications Centre Indian Space Research OrganisationAhmedabad380015India

Celadonite and glauconite are comparable in terms of physical,chemical and mineralogical *** of both these minerals requires slightly oxygen-depleted conditions in a semiconfined micro-environment,facilitating the uptake of Fe into the *** glauconite is ubiquitous in marine deposits,celadonite forms in both marine and non-marine environments,more commonly by altering intermediate to mafic rocks.A review of data across the geological column shows that both these minerals are more common in the Mesozoic and Cenozoic,which may be related to extensive *** composition of celadonite and glauconite is highly variable and is controlled by the availability of cations within the pore water *** major element composition of celadonite overlaps with that of evolved to highly evolved glauconite to a large *** data and representative samples of celadonite and glauconite reveal subtle differences in X-ray diffraction parameters and Fourier transform infrared(FTIR)*** shows sharper basal and hkl reflections than *** characteristically exhibits distinct 111-021,003-022,023 and 130-131,and 060 reflections at less than 1.51A,indicating a betterordered crystallographic structure than *** FTIR spectra of celadonite and glauconite show similar absorption bands although Si-O bending,Si-O stretching and OH-stretching bands are sharper and well resolved in celadonite than that of *** palaeoenvironmental interpretations,it is,therefore,necessary to examine the subtle differences in X-ray diffraction parameters and FTIR spectra to confirm the identification of these two *** composition of celadonite relates closely to the host rock and depositional *** celadonite associated with mafic rock shows relatively high Fe,Mg and low Al *** contrast,those associated with felsic to intermediate composition rocks show slightly higher contents of Al and

关键词： Celadonite Glauconite Authigenic green silicates Large igneous province Marine Fourier transform infrared spectroscopy X-ray diffraction

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Facile synthesis of asymmetric patchy Janus Ag/Cu particles and study of their antifungal activity

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Frontiers of Materials Science 2020年第1期14卷 24-32页

作者： Sudipta Biswas satadru Pramanik Suman Mandal Sudeshna Sarkar Sujata Chaudhuri Swati De Department of Chemistry University of KalyaniKalyani741235NadiaWBIndia Department of Botany University of KalyaniKalyani741235NadiaWBIndia Department of Chemistry Basirhat CollegeNorth 24 Parganas743412BasirhatWBIndia

Asymmetric patchy Ag/Cu Janus nanoparticles(NPs)were synthesized via a“seed-mediated”*** is the first report of synthesis of nanometer sized metal-based Janus NPs without using complicated *** adsorption of the surfactant onto the seed NPs leads to the formation of Janus type *** the reduction potential of Ag+/Ag0 and Cu2+/Cu0 systems directs the formation of the“patch”.The patchy Janus NPs show significant antifungal activity towards a potent rice pathogen thus offering the prospect of future application in crop protection.

关键词： patchy Janus nanoparticle seed mediated method CTAB antifungal activity

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Ethnopharmacology, phytochemistry and pharmacology of Tephrosia purpurea

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Chinese Journal of Natural Medicines 2014年第1期12卷 1-7页

作者： satadru Palbag Bijay Kr.Dey Narendra Kumar Singh Faculty of Ayurveda Institute of Medical Sciences Banaras Hindu University Bengal Institute of Pharmaceutical Sciences SPLPIM Campus Jadavpur University

Tephrosia purpurea(L.) Pers. is popularly known as ‘Sarapunkha' in classical Ayurvedic texts. It is a perennial plant belonging to the family Fabaceae, and occurs throughout the Indian subcontinent. T. purpurea is traditionally used to treat spleenomegaly, cirrhosis, cough and cold, abdominal swelling and as an antidote in the Ayurvedic system of medicine. Phytochemical investigations indicate the presence of semiglabrin, pongamole, lanceolatins A and B, rutin, lupeol, and β-sitosterol. Flavonoids including(+)-tephrorin A and B,(+)-tephrosone, an isoflavone, 7, 4'-dihydroxy-3', 5'-dimethoxyisoflavone and a chalcone,(+)-tephropurpurin were isolated from the whole plant. Pharmacological activities of different parts of the plant reported include anti-inflammatory, antiulcer, antimicrobial, antioxidant, antiallergic, antidiabetic, hepatoprotective, antitumor and insect repellent activity. In the present review, the literature on the phytochemical and pharmacological investigations of Tephrosia purpurea(L.) Pers. are summarized to August, 2012.

关键词： Tephrosia purpurea Phytoconstituents Flavonoids Antitumor Anti-inflammatory Hepatoprotective

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