Thermal treatment for the separation of phosphate and recovery of rare earth metals (REMs) from Korean monazite

Archana Kumari,Rekha Panda,Manis Kumar Jha,이진영,J. Rajesh Kumar,Vinay Kumar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

Systematic study for thermal decomposition of monazite to remove phosphate as a valuable productusing Na2CO3 and NaOH roasting processes to validate the TG/DTA studies is reported here. Monazite in1:1 wt. ratio with Na2CO3 and NaOH requires a temperature of 900 8C and 400 8C, respectively, for120 min in order to achieve complete conversion of rare earth phosphate into its oxides. The roastedmass was washed, dried and leached in 6 M HCl for 2 h, pulp density 30 g/L at 80 8C which results in>90% REMs recovery. Leach liquor generated will be further processed by solvent extraction andprecipitation processes.

Image-Guided Fine Needle Cytology with Aspiration Versus Non-Aspiration in Retroperitoneal Masses: Is Aspiration Necessary?

Rajiv Kumar Misra,Shaila Mitra,Rishav Kumar Jain,Shilpa Vahikar,Archana Bundela,Purak Misra 대한병리학회 2015 Journal of Pathology and Translational Medicine Vol.49 No.2

Background: Although using fine needle cytology with aspiration (FNC-A) for establishing diagnoses in the retroperitoneal region has shown promise, there is scant literature supporting a role of non-aspiration cytology (FNC-NA) for this region. We assessed the accuracy and reliability of FNC-A and FNC-NA as tools for preoperative diagnosis of retroperitoneal masses and compared the results of both techniques with each other and with histopathology. Methods: Fifty-seven patients with retroperitoneal masses were subjected to FNC-A and FNC-NA. Smears were stained with May-Grunwald Giemsa and hematoxylin and eosin stain. An individual slide was objectively analysed using a point scoring system to enable comparison between FNC-A and FNC-NA. Results: By FNC-A, 91.7% accuracy was obtained in cases of retroperitoneal lymph node lesions followed by renal masses (83.3%). The diagnostic accuracy of other sites by FNC-A varied from 75.0%–81.9%. By FNC-NA, 93.4% diagnostically accurate results were obtained in the kidney, followed by 75.0% in adrenal masses. The diagnostic accuracy of other sites by FNC-NA varied from 66.7%–72.8%. Conclusions: Although both techniques have their own advantages and disadvantages, FNC-NA may be a more efficient adjuvant method of sampling in retroperitoneal lesions.

Thermal treatment for the separation of phosphate and recovery of rare earth metals (REMs) from Korean monazite

Kumari, Archana,Panda, Rekha,Jha, Manis Kumar,Lee, Jin Young,Kumar, J. Rajesh,Kumar, Vinay Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-

<P><B>Abstract</B></P> <P>Systematic study for thermal decomposition of monazite to remove phosphate as a valuable product using Na<SUB>2</SUB>CO<SUB>3</SUB> and NaOH roasting processes to validate the TG/DTA studies is reported here. Monazite in 1:1wt. ratio with Na<SUB>2</SUB>CO<SUB>3</SUB> and NaOH requires a temperature of 900°C and 400°C, respectively, for 120min in order to achieve complete conversion of rare earth phosphate into its oxides. The roasted mass was washed, dried and leached in 6M HCl for 2h, pulp density 30g/L at 80°C which results in >90% REMs recovery. Leach liquor generated will be further processed by solvent extraction and precipitation processes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effective process for separation and recovery of rare earth metals. </LI> <LI> Alkaline thermal treatment under optimized condition is used to dephosphorize monazite. </LI> <LI> 99% phosphate was separated and recovered as value added product of sodium tri-phosphate. </LI> <LI> The oxide of rare earth concentrate was leached in chloride medium to recover high percentage of rare earth metals. </LI> </UL> </P>

Expression profiling of mitogen-activated protein kinase genes from chickpea (Cicer arietinum L.) in response to Helicoverpa armigera, wounding and signaling compounds

Indrakant Kumar Singh,Sumit Kumar,Sujata Singh,Archana Singh 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.3

The Mitogen-activated Protein Kinase (MAPK) Cascades play a crucial role in the regulation of defense responses in plants. Herbivory- or wounding-related MAPKs, SA-induced protein kinase (SIPK) and wound-induced protein kinase (WIPK) have been identified to be associated with insect attack. However, function of MAPKs in crop plants in response to herbivory largely remains unknown. Here, we evaluated the expression patterns of fifteen MAPK genes from chickpea in response to infestation by a major pest, Helicoverpa armigera via quantitative realtime PCR (qPCR). Subsequently, we compared the expression patterns of CaMAPKs in response to two related but different processes i.e. insect attack and mechanical wounding. Signaling compounds such as Jasmonates, Salicylic acid and Ethylene also play crucial function in defense response. Therefore, we have also examined the expression profiles of H. armigera-inducible MAPK genes in response to these signaling compounds. Our results revealed that out of fifteen CaMAPKs, seven of the CaMAPKs are upregulated in response to H. armigera and two are downregulated. Additionally, they show differential expression on comparing Helicoverpa-infestation and wounding. Jasmonates and Ethylene mainly regulate CaMAPK genes that may play a role in defense against Helicoverpa-infestation. This study provides insights into the participation of MAPKs in defense against insects.

Bioactive molecules from plants: a prospective approach to combat SARS-CoV-2

Gagan Kumar Panigrahi,Shraban Kumar Sahoo,Sahoo Annapurna,Shibasish Behera,Sahu Snigdharani,Dash Archana,Satapathy Kunja Bihari 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.3

The emergence of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) or 2019 Novel Coronavirus (2019-nCoV) has put the entire globe into unrest, primarily due to unavailability of specific drug against the viral proteins. In the last two decades the world has withstood many contagious disease crashes. SARS-CoV-2 has put the world and the mankind in danger. It is spreading unstoppably all over the world. The virus is evolving and thus the pathogenicity of SARS-CoV-2 strains has been different and making it difficult to develop a broad-spectrum anti-viral molecule that would be effective against all the SARS-CoV-2 variants. This imperative situation demands development of molecules for effective treatment against SARS-CoV-2. The phytomolecules or the bioactive molecules of plants could be a great alternative to combat SARS-CoV-2. The bioactive molecules with their antiviral properties and the secondary metabolites may effectively deactivate the functioning of viral proteins. The structural configuration of 2019-nCoV proteins and genomic information are available, thus contributing immensely for fast molecular docking studies and hence, enables screening of numerous accessible phytomolecules. In the current study, we have essentially highlighted common phytomolecules against the known viral proteins and described the mode of action of few plant-derived molecules which have the potential to suppress the activity of the viral proteins.

Leaching of rare earth metals (REMs) from Korean monazite concentrate

Rekha Panda,Manis Kumar Jha,이진영,Archana Kumari,Jhumki Hait,Vinay Kumar,J. Rajesh Kumar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

Systematic scientific studies for dephosphorization and acid leaching of Korean monazite are reported here. 50% NaOH (w/v) solubilizes 99.99% phosphate, at 170 ℃, 100 g/L pulp density in 4 h. Kinetics of phosphate leaching fitted well with model ‘‘chemical reaction control,’’ i.e. 1 - (1 - X)1/2 = kct, Ea = 58.04 kJ/mol. Further, rare earth hydroxides (REHs) was leached using 6 N HCl at 90 ℃, 60 g/L pulp density for 2 h to recover ~95% REMs. Leach liquor generated can be further processed using solvent extraction/ion exchange techniques. From the pure solutions, metal/salts could be obtained using evaporation, precipitation, etc.

Treatment of monazite processed effluent to recover rare earth metals (REMs)

Archana Kumari,Sunidhi Singh,Kavita Parmar,Devendra Deo Pathak,Manis Kumar Jha 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-

Improper disposal of effluent generated in rare earth mining areas and ore processing industries resultsin loss of REMs and miserably affects the ecosystem. Thus, their appropriate treatment is required, whichcan be achieved via environmentally feasible processes. In this connection, systematic scientificadsorption studies were carried out to separate REMs using cationic resin, Amberlite IR120 Na from theeffluent generated during monazite processing for REMs recovery. To optimize feasible conditions forREMs recovery, bench scale studies were carried out varying different process parameters viz. pH, contacttime, resin dose, etc. It was observed that adsorption of 92.63% La, 92.79% Ce, 91.45% Nd, 90.95% Pr and95.09% Sm was achieved at aqueous/ resin (A/R) ratio 25 mL/g, pH 1.3 and contact time 10 min. Loadingcapacity of resin was found to hold 48.57 mg REMs/g resin. The adsorption data followed the second orderreaction ((t/q) = (1/h) + (1/qe)(t)) and Langmuir adsorption isotherm (1/q = [(1/k1 qm)(1/Ce)] + (1/qm)). The loaded REMs was effectively eluted using 15% H2SO4 in 10 min. The REMs enriched solution wastreated to get pure REM oxides as precipitate. This technical application will be useful for REMs recoveryas well as to mitigate environmental pollution.

Validity of Heckscher-Ohlin-Vanek Hypothesis

Archana Srivastava,Somesh Kumar Mathur 한국경제연구학회 2014 Korea and the World Economy Vol.15 No.3

The paper uses partial and complete tests to confirm the validity of the Heckscher-Ohlin-Vanek hypothesis (H-O-V). H-O-V hypothesis relates factor abundance and scarcity to the factor content of net trade. Partial test is performed using India’s industry level data from the year 1989-2008. The results reveal that India is abundant in unskilled labour and capital and it is scarce in skilled labour, energy and services as an input in manufacturing sector. Further, a complete test is performed by considering five factors of production, such as primary educated labour force, labour force with secondary and tertiary education, capital and arable land and a set of ten important industries such as mineral, chemical, plastics and rubber, leather, wood, textile, stone/glass, metal, machinery and transportation industries for the year 2009. The complete test is a test of the modified H-O-V theorem which defines abundance and scarcity of factors using excess supply approach. The results justify the H-O-V theorem in more than 50% of the cases. This supports the immense importance of factors and their productivity differentials in explaining India’s trade with its trading partners.

Physico-Chemical Studies on Molecular Interactions of Curcumin with Mono and Divalent Salts at Different Temperature

Archana Pandey,Roli Srivastava,Anil Kumar Shukla,A.R. Saksena 보안공학연구지원센터 2011 International Journal of Smart Home Vol.5 No.1

Fundamentals of Fascinating Graphene Nanosheets: A Comprehensive Study

Sumanta Kumar Sahoo,Archana Mallik 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.3

Graphene nanosheets have attracted immense research interest among the materials science community from electronics to the biomedical field. Being the first member of two-dimensional nanomaterials family, discovered in 2004 followed by the Nobel Prize winning in 2010, it is now readily witnessing global industrial revolutions. The nanomaterial is bestowed with such unprecedented features that can be tangible to a wide spectrum of applications ranging from energy storage devices to sensor application. Enormous flattened surfaces, superior mechanical strength and flexibility, ballistic intrinsic carrier mobility, nearly transparent nature, high thermal conductivity and room-temperature ferromagnetic behavior are few of the extraordinary attributes of the monolayer of carbon nanosheets. In this comprehensive review, an attempt has been put forward to precisely revisit and represent the literature available on the fundamental properties of graphene nanomaterials. Also, the usage of its characteristic features in various applications as well as synthesis process has been briefly discussed.