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Samaddar, Pallabi,Deep, Akash,Kim, Ki-Hyun Elsevier 2018 Chemical engineering journal Vol.342 No.-
<P><B>Abstract</B></P> <P>Because of their unique ordered structures, block copolymers (BCPs) are known to form a broad range of morphologies (e.g., cylinders, vesicles, spheres, and lamellae). These types of assemblies can be utilized for various potential and practical applications in numerous fields including nanotechnology. This review addresses classification of different BCPs based on polymeric moieties and arrangement of polymer chains present in their structure. Physicochemical characteristics of BCP micelles in aqueous media are also discussed along with the beneficial features of BCP self assembly in the generation of nanostructures. Potential applications of BCP-drug conjugates have also been described with numerous case studies. In addition, successful implementation of BCP self-assembly in modern age research of nanoporous ultrafiltration membrane, nanolithography, functionalized nanomaterial preparation has been overviewed with mechanistic details. Finally, we offer a brief perspective on the future opportunities of BCPs in diverse research fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Block copolymers (BCPs) tend to occur exclusively in nature. </LI> <LI> Through aggregation of different monomers, BCPs exhibit enhanced stability and durability. </LI> <LI> BCPs are here classified by the structure/shape of the dissimilar blocks in the polymer chain. </LI> <LI> Property of BCPs is assessed in terms of micelle-forming capacity, solubility, and functionality. </LI> <LI> Coverage of this review highlight the future prospects of BCPs to benefit their future research. </LI> </UL> </P>
( Sandipan Samaddar ),( Gwang Hyun Han ),( Puneet Singh Chauhan ),( Poulami Chatterjee ),( Sunyoung Jeon ),( Tongmin Sa ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.2
Soils amended for long-term with high levels of compost demonstrated greater abundance of bacterial members of the phylum Bacteroidetes whereas a decreasing trend in the relative abundance of phylum Acidobacteria was noted with increasing levels of compost. Metabolic profiles predicted by PICRUSt demonstrated differences in functional responses of the bacterial community according to the treatments. Soils amended with lower compost levels were characterized by abundance of genes encoding enzymes contributing to membrane transport and cell growth whereas genes encoding enzymes related to protein folding and transcription were enriched in soils amended with high levels of compost. Thus, the results of the current study provide extensive evidence of the influence of different compost levels on bacterial diversity and community structure in paddy soils.
Cloud point extraction: A sustainable method of elemental preconcentration and speciation
Pallabi Samaddar,Kamalika Sen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Trace elements are gaining increasing attention of scientists working in various analytical fields. Presence or absence of a trace element in a system seriously modifies its intrinsic behavior. Cloud point extraction (CPE) is an upcoming technology to preconcentrate and separate many of the trace elements from different chemical and biological systems. The system is sustainable as it involves benign extractants like surfactants and that too at low concentrations at slightly elevated temperatures to form clouds that separate out from the bulk solution. In addition, the extraction behavior of many elements depends on its chemical species. Keeping in view the need to summarize the research encompassing this technique, many review articles were published which cover a selection of the literature published on this topic over several time spans. A myriad of various technological developments has been reported by several workers. These developments have prompted us to revisit the CP technology with a better understanding of its detection, mechanism and extension to species dependent extraction behavior with regard to the state of art determination of trace metals in our day to day applications. The present article summarizes mainly the results of trace metal preconcentration using CP methodology from different practical samples with an insight to the probable mechanism and speciation involved from 2006 onwards.
( Sandipan Samaddar ),김기윤 ( Kiyoon Kim ),( Poulami Chatterjee ),전선영 ( Sunyoung Jeon ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Ammonia oxidation is the first and rate-limiting step in nitrification, the oxidation of ammonia to nitrate via nitrite. However, we know little about archaeal population under field conditions, or how their relative contributions to soil nitrification respond to the combination of cropping treatment and seasonal conditions. Archaea especially Ammonia oxidizing archaea are responsible for the rate limiting step in nitrification; a key nitrogen (N) loss pathway in agricultural systems. Among the factors reported to influence the abundance and diversity of archaea are fertilizers (ammonium addition).The main objective of this study is to investigate the abundance and diversity of archaeal community especially nitrifying archaea in paddy fields under five different treatments (No fertilizer (CON), Chemical Fertilizer (CF), Compost (CO), Chemical fertilizer along with Compost (FCO), P & K [N free] (NFR) and how it is correlated to physicochemical parameters and nitrification potential in soil. Soil samples were collected from paddy fields of Department of Southern Area Crop Science, Paddy Crop research Division, Miryang, Republic of Korea and were used to characterize the abundance and diversity of ammonia oxidizing archaeal community based on ammonia monooxygenase gene (amoA). Soil enzyme activities, chemical parameters and nitrification potential were determined in laboratory using standard procedures. Soil nucleic acid was extracted from 0.25 grams of soil using PowerSoil DNA isolation kit (MoBIO, Carlsbad, CA, USA) following the manufacturer`s protocol. Quantitative PCR (qPCR) reactions were performed on a Rotor-Gene 6000 real-time rotary qPCR analyzer (Corbett Research) using SYBR Green PCR master mix (Applied Biosystems). Pyrosequencng of amoA gene was performed on a 454 GS FLX Platform by Macrogen, South Korea. Results revealed the treatments lead to considerable changes in community structure of nitrifying archaea and lead to separate taxonomical placement in a reference tree. The soil factor organic matter was found to contribute significantly for shaping this change in community structure.
Species dependent sustainable preconcentration of zinc: Possible aspects of ABS and CPE
Pallabi Samaddar,Kamalika Sen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The environmentally benign extraction systems like aqueous biphasic system (ABS) and cloud pointextraction (CPE) techniques are well exploited for their applications in elemental speciation analysis. Inthis article we have studied the extraction possibility of different Zn species using ABS and CPE. Theextractions are studied at trace concentration levels in the presence and absence of different interferingcations and anions to find the possibility to preconcentrate Zn in the presence of other elements. It hasbeen observed that using CPE, a complete extraction of Zn-PAN is possible with Cu(II) as a potentialinterfering ion. Using ABS, 82% extraction of Zn as Zn-insulin complex is possible with no considerableinterference from the associated metal ions. However, the anions like PO43 , SCN and NO2 ions do interfere. Finally, the clouds of the CPE were taken for confocal microscopy after dissolution in suitablemedia. The images demonstrate the mechanism of micellization of different Zn species. The nanometersized vesicles with the Zn species incorporated in it indicates a stronger extraction possibility of the CPEthan ABS. The results are indicative of the methodology to be chosen for Zn extraction as per the need ofthe analyst.