School Of Basic And Applied Sciences
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Item The creation of selenium nanoparticles decorated with troxerutin and their ability to adapt to the tumour microenvironment have therapeutic implications for triple-negative breast cancer(Royal Society of Chemistry, 2023-02-09T00:00:00) Saranya, Thiruvenkataswamy; Kavithaa, Krishnamoorthy; Paulpandi, Manickam; Ramya, Sennimalai; Winster, Sureshbabu Harysh; Mani, Geetha; Dhayalan, Sangeetha; Balachandar, Vellingiri; Narayanasamy, ArulDespite advancements in treatment, managing aggressive types of breast cancer, particularly Triple Negative Breast Cancer (TNBC), remains a daunting task. Newer chemotherapeutics enhance the multidrug resistance in cancer cells, making them untreatable. The current research work was framed to develop a novel therapeutic target by utilizing the flavanol, troxerutin (TXN) as a drug of interest to target TNBC. And also, to increase the efficiency of the drug at the target site, a nanocarrier called selenium nanoparticles (SeNPs) has been exploited. Thus, the anticancer efficacy of TXN and Se-TXN against TNBC (in vitro and in vivo) has been compared and analysed in the present study. Se-TXN was synthesized by a precipitation approach and characterized by diverse analytical techniques, which confirmed the successful loading of TXN on the SeNPs. The inhibitory concentration (IC50) of Se-TXN was determined to be 6.5 � 0.5 ?g mL?1 according to the in vitro data. Even at lower concentrations, the existence of apoptotic bodies shows that Se-TXN is effective against TNBC. Additionally, the Se-TXN expression study shows that the activation of the caspase cascade pathway, which results in apoptosis, occurs from the downregulation of anti-apoptotic proteins and genes and the upregulation of pro-apoptotic proteins and genes. And the in vivo investigations like histopathology, hematology and biochemical parameters revealed that the Se-TXN had significantly lowered the tumour volume of treated Balb/C mice without having any significant systemic toxicity when compared to other treatment groups. Altogether, our data suggests the efficacy of Se-TXN nanoconjugates as an effective management therapy for treating TNBC. � 2023 The Royal Society of Chemistry.Item Quantification and optimization of clot retraction in washed human platelets by Sonoclot coagulation analysis(John Wiley and Sons Inc, 2021-10-07T00:00:00) Yadav, Pooja; Beura, Samir K.; Panigrahi, Abhishek R.; Singh, Sunil K.Introduction: Clot retraction is a pivotal process for haemostasis, where platelets develop a contractile force in fibrin meshwork and lead to the increased rigidity of clot. The pathophysiological alteration in contractile forces generated by the platelet-fibrin meshwork can lead to haemostatic disorders. Regardless of its utter significance, clot retraction remains a limited understood process owing to lack of quantification methodology. Sonoclot analysis is a point-of-care technique used in clinical laboratories for whole blood analysis that provides�in vitro�qualitative as well as quantitative assessment of coagulation process from initial fibrin formation to clot retraction. Methods: Human washed platelets were isolated by differential centrifugation method and analysed via optical imaging, microscopy and Sonoclot analysis using 1-2�נ108/mL of washed platelets, 1�U/mL of thrombin, 1�mg/mL of fibrinogen and 1�mM of calcium chloride. Results: In this study, we demonstrate the novelty of this instrument in the quantitative evaluation of clot retraction in washed platelets and attempted to optimize the reference range of Sonoclot parameters including ACT - 87.3���20.997, CR - 16.23���3.538 and PF - 3.57���0.629, (n�=�10). Discussion: Sonoclot analysis provides a simple and quantitative method to better understand in vitro clot retraction and its modulation by retraction components including platelet count, fibrinogen and platelet�fibrin interaction compared with existing conventional methods. Sonoclot may prove to be a valuable tool in thrombus biology research to understand fundamental basis of blood clot retraction. � 2021 John Wiley & Sons LtdItem Dopamine, sleep, and neuronal excitability modulate amyloid-?-mediated forgetting in Drosophila(Public Library of Science, 2021-10-07T00:00:00) Kaldun, Jenifer C.; Lone, Shahnaz R.; Humbert Camps, Ana M.; Fritsch, Cornelia; Widmer, Yves F.; Stein, Jens V.; Tomchik, Seth M.; Sprecher, Simon G.Alzheimer disease (AD) is one of the main causes of age -related dementia and neurodegeneration. However, the onset of the disease and the mechanisms causing cognitive defects are not well understood. Aggregation of amyloidogenic peptides is a pathological hallmark of AD and is assumed to be a central component of the molecular disease pathways. Panneuronal expression of A?42 Arctic peptides in Drosophila melanogaster results in learning and memory defects. Surprisingly, targeted expression to the mushroom bodies, a center for olfactory memories in the fly brain, does not interfere with learning but accelerates forgetting. We show here that reducing neuronal excitability either by feeding Levetiracetam or silencing of neurons in the involved circuitry ameliorates the phenotype. Furthermore, inhibition of the Rac-regulated forgetting pathway could rescue the A?42 Arctic-mediated accelerated forgetting phenotype. Similar effects are achieved by increasing sleep, a critical regulator of neuronal homeostasis. Our results provide a functional framework connecting forgetting signaling and sleep, which are critical for regulating neuronal excitability and homeostasis and are therefore a promising mechanism to modulate forgetting caused by toxic A? peptides. � 2021 Kaldun et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Item Biosynthesis of Zinc Oxide Nanoparticles Using Catharanthus Roseus Leaves and Their Therapeutic Response in Breast Cancer (MDA-MB-231) Cells(Routledge, 2021-07-26T00:00:00) Bangroo, Apoorva; Malhotra, Akshay; Sharma, Uttam; Jain, Aklank; Kaur, AnupreetAs the current study reports the utilization of the leaf extract of Catharanthus roseus (C.roseus) for the biological synthesis of zinc oxide nanoparticles (ZnO NPs) because of the importance of the importance of health and environment. Bioinspired synthesis were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Field Emission-Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), Energy-Dispersive X-ray Spectroscopy (EDX) and X-Ray diffraction (XRD). XRD and TEM micrograph analysis revealed that the synthesized nanostructures were well-dispersed and spherical with the average particle size in the 18-30 nm range were produced. The FT-IR spectra confirmed presence of phenolic compounds that act as reducing and capping agents. Further, it suggested the possible utilization of hydroxyl groups and amides in the reduction of Zn ions and stablization of ZnO NPs. Zinc oxide nanomaterials are effective in cancer treatments, including the destruction of tumor cells with minimal damage to healthy cells. The toxicity of zinc oxide nanomaterials was checked in vitro in the human breast cancer line MDA-MB-231. Inverse relation of the percentage of viable cells to the concentration of zinc oxide nanomaterials at increasing molar levels was assessed. The cytotoxicity analysis used in the MTT test shows the substantial viable MDA-MB-231-cells despite the increased concentration of exposure to zinc oxide nanomaterials. Reduction in the ratio of viable MDA-MB-231 cells after being exposed to zinc oxide nanomaterials was compared to untreated cancerous cells. The present approach to biosynthesis is quick, inexpensive, eco-friendly, and high-rise stable nanomaterials of zinc oxide with substantial cancer potential. This is the first study that reports molar concentrations (with the lowest concentration of 10 mM) as an anticancer agent for breast cancer and potential clinical uses for synthesized zinc oxide nanomaterials. Thus, C. roseus based synthesized ZnO NPs could be explored not only as environmentally benign method but also as a potential anti-carcinogenic agent. � 2022 Taylor & Francis Group, LLC.Item Synergistically modified WS2@PANI binary nanocomposite-based all-solid-state symmetric supercapacitor with high energy density(Royal Society of Chemistry, 2022-03-09T00:00:00) Iqbal, Muzahir; Saykar, Nilesh G.; Alegaonkar, Prashant S.; Mahapatra, Santosh K.The rapid development of intelligent, wearable, compact electronic equipment has triggered the need for durable, flexible, and lightweight portable energy storage devices. Nanomaterials that are capable of delivering the high specific power density and commensurate energy density are potential candidate for realizing such devices. Herein, we report the facile synthesis of a binary nanocomposite WS2@PANI by utilizing hydrothermal and physical blending techniques to assess it as an electrode material for high-performance supercapacitors. The nanocomposite electrode delivered specific capacitance >335 F g?1 @ 10 mV s?1 (two-electrode), achieving energy and power densities of ?80 W h kg?1 and ?800 W kg?1, respectively, with capacitance retention of 83% even after 5000 charge-discharge cycles @ 10 A g?1, all of which are superior to the WS2 electrode. Dunns model quantifies capacitive and intercalative contributions that showed the cumulative effect of both to realize a robust, cost-effective, and energy-efficient device. The strategically incorporated PANI broadened the electrochemical window and the device's overall performance, resulting in high specific energy density. We demonstrated that our all-solid-state symmetric supercapacitor could be used to illuminate a light-emitting diode and drive a rotary motor. We believe that our WS2@PANI binary nanocomposite will be a potential candidate for energy storage devices. � 2022 The Royal Society of ChemistryItem Burden of dengue, leishmaniasis and lymphatic filariasis in India and its states from 1990�2019: Analysis from the Global Burden of Disease study (GBD 2019)(Public Library of Science, 2023-10-18T00:00:00) Dutta, Omprokash; Prasanth, Ajay; Kumari, Ashu; Akanksha, Kumari; Deeba, Farah; Salam, NasirVector-borne diseases such as dengue, leishmaniasis, and lymphatic filariasis, constitute significant sources of illness, disability, and mortality among the poor and vulnerable in many countries around the world, including India. Based on the global burden of diseases, injuries, and risk factors study 2019, we analyse the burden of dengue, leishmaniasis, and lymphatic filariasis, in India from 1990 to 2019. Over this period, there was a reduction in the burden of lymphatic filariasis and leishmaniasis. Notably, dengue emerged as the most common vector-borne disease, exhibiting high fatality rate above 15 years of age and the highest DALY within 15�49 age group. Additionally, dengue cases surged substantially between 1990 and 2019. Leishmaniasis related mortality and DALY declined in the year 2019 compared to the year 1990, with high mortality and DALY in the 0-49-year-old age group. For lymphatic filariasis, DALY was more pronounce among those in the 15�49-year age group, which underwent reduction in 2019. Males had a higher burden in other vector-borne diseases than females, although females had a slightly elevated dengue burden. These findings highlight the evolving epidemiological trends related to vector-borne diseases in India, over the last three decades and underline the critical significance of sustained efforts for the elimination and control of vector-borne diseases. � 2023 Dutta et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Item Global, regional, and national sex differences in the global burden of tuberculosis by HIV status, 1990�2019: results from the Global Burden of Disease Study 2019(Elsevier Ltd, 2021-09-23T00:00:00) Ledesma, Jorge R.; Ma, Jianing; Vongpradith, Avina; Maddison, Emilie R.; Novotney, Amanda; Biehl, Molly H.; Legrand, Kate E.; Ross, Jennifer M.; Jahagirdar, Deepa; Bryazka, Dana; Feldman, Rachel; Abolhassani, Hassan; Abosetugn, Akine Eshete; Abu-Gharbieh, Eman; Adebayo, Oladimeji M.; Adnani, Qorinah Estiningtyas Sakilah; Afzal, Saira; Ahinkorah, Bright Opoku; Ahmad, Sajjad Ahmad; Ahmadi, Sepideh; Rashid, Tarik Ahmed; Salih, Yusra Ahmed; Aklilu, Addis; Akunna, Chisom Joyqueenet; Al Hamad, Hanadi; Alahdab, Fares; Alemayehu, Yosef; Alene, Kefyalew Addis; Ali, Beriwan Abdulqadir; Ali, Liaqat; Alipour, Vahid; Alizade, Hesam; Al-Raddadi, Rajaa M.; Alvis-Guzman, Nelson; Amini, Saeed; Amit, Arianna Maever L.; Anderson, Jason A.; Androudi, Sofa; Antonio, Carl Abelardo T.; Antony, Catherine M.; Anwer, Razique; Arabloo, Jalal; Arja, Asrat; Asemahagn, Mulusew A.; Atre, Sachin R.; Azhar, Gulrez Shah; Darshan, B.B.; Babar, Zaheer-Ud-Din; Baig, Atif Amin; Banach, Maciej; Barqawi, Hiba Jawdat; Barra, Fabio; Barrow, Amadou; Basu, Sanjay; Belgaumi, Uzma Iqbal; Bhagavathula, Akshaya Srikanth; Bhardwaj, Nikha; Bhardwaj, Pankaj; Bhattacharjee, Natalia V.; Bhattacharyya, Krittika; Bijani, Ali; Bikbov, Boris; Boloor, Archith; Briko, Nikolay Ivanovich; Buonsenso, Danilo; Nagaraja, Sharath Burugina; Butt, Zahid A.; Carter, Austin; Carvalho, Felix; Charan, Jaykaran; Chatterjee, Souranshu; Chattu, Soosanna Kumary; Chattu, Vijay Kumar; Christopher, Devasahayam J.; Chu, Dinh-Toi; Claassens, Mareli M.; Dadras, Omid; Dagnew, Amare Belachew; Dai, Xiaochen; Dandona, Lalit; Dandona, Rakhi; Daneshpajouhnejad, Parnaz; Darwesh, Aso Mohammad; Dhamnetiya, Deepak; Dianatinasab, Mostafa; Diaz, Daniel; Doan, Linh Phuong; Eftekharzadeh, Sahar; Elhadi, Muhammed; Emami, Amir; Enany, Shymaa; Faraon, Emerito Jose A.; Farzadfar, Farshad; Fernandes, Eduarda; Desideri, Lorenzo Ferro; Filip, Irina; Fischer, Florian; Foroutan, Masoud; Frank, Tahvi D.; Garcia-Basteiro, Alberto L.; Garcia-Calavaro, Christian; Garg, Tushar; Geberemariyam, Biniyam Sahiledengle; Ghadiri, Keyghobad; Ghashghaee, Ahmad; Golechha, Mahaveer; Goodridge, Amador; Gupta, Bhawna; Gupta, Sapna; Gupta, Veer Bala; Gupta, Vivek Kumar; Haider, Mohammad Rifat; Hamidi, Samer; Hanif, Asif; Haque, Shaful; Harapan, Harapan; Hargono, Arief; Hasaballah, Ahmed I.; Hashi, Abdiwahab; Hassan, Shoaib; Hassankhani, Hadi; Hayat, Khezar; Hezam, Kamal; Holla, Ramesh; Hosseinzadeh, Mehdi; Hostiuc, Mihaela; Househ, Mowafa; Hussain, Rabia; Ibitoye, Segun Emmanuel; Ilic, Irena M.; Ilic, Milena D.; Irvani, Seyed Sina Naghibi; Ismail, Nahlah Elkudssiah; Itumalla, Ramaiah; Jaafari, Jalil; Jacobsen, Kathryn H.; Jain, Vardhmaan; Javanmardi, Fatemeh; Jayapal, Sathish Kumar; Jayaram, Shubha; Jha, Ravi Prakash; Jonas, Jost B.; Joseph, Nitin; Joukar, Farahnaz; Kabir, Zubair; Kamath, Ashwin; Kanchan, Tanuj; Kandel, Himal; Katoto, Patrick D.M.C.; Kayode, Gbenga A.; Kendrick, Parkes J.; Kerbo, Amene Abebe; Khajuria, Himanshu; Khalilov, Rovshan; Khatab, Khaled; Khoja, Abdullah T.; Khubchandani, Jagdish; Kim, Min Seo; Kim, Yun Jin; Kisa, Adnan; Kisa, Sezer; Kosen, Soewarta; Koul, Parvaiz A.; Laxminarayana, Sindhura Lakshmi Koulmane; Koyanagi, Ai; Krishan, Kewal; Bicer, Burcu Kucuk; Kumar, Avinash; Kumar, G. Anil; Kumar, Narinder; Kumar, Nithin; Kwarteng, Alexander; Lak, Hassan Mehmood; Lal, Dharmesh Kumar; Landires, Iv�n; Lasrado, Savita; Lee, Shaun Wen Huey; Lee, Wei-Chen; Lin, Christine; Liu, Xuefeng; Lopukhov, Platon D.; Lozano, Rafael; Machado, Daiane Borges; Kunjathur, Shilpashree Madhava; Madi, Deepak; Mahajan, Preetam Bhalchandra; Majeed, Azeem; Malik, Ahmad Azam; Martins-Melo, Francisco Rogerl�ndio; Mehta, Saurabh; Memish, Ziad A.; Mendoza, Walter; Menezes, Ritesh G.; Merie, Hayimro Edemealem; Mersha, Amanual Getnet; Mesregah, Mohamed Kamal; Mestrovic, Tomislav; Mheidly, Nour Mheidly; Misra, Sanjeev; Mithra, Prasanna; Moghadaszadeh, Masoud; Mohammadi, Mokhtar; Mohammadian-Hafshejani, Abdollah; Mohammed, Shafu; Molokhia, Mariam; Moni, Mohammad Ali; Al Montasir, Ahmed; Moore, Catrin E.; Nagarajan, Ahamarshan Jayaraman; Nair, Sanjeev; Nair, Suma; Naqvi, Atta Abbas; Swamy, Sreenivas Narasimha; Nayak, Biswa Prakash; Nazari, Javad; Kandel, Sandhya Neupane; Nguyen, Trang Huyen; Nixon, Molly R.; Nnaji, Chukwudi A.; Ntsekhe, Mpiko; Nu�ez-Samudio, Virginia; Oancea, Bogdan; Odukoya, Oluwakemi Ololade; Olagunju, Andrew T.; Oren, Eyal; Mahesh, P.A.; Parthasarathi, Ramakrishnan; Kan, Fatemeh Pashazadeh; Pattanshetty, Sanjay M.; Paudel, Rajan; Paul, Pintu; Pawar, Shrikant; Pepito, Veincent Christian Filipino; Perico, Norberto; Pirestani, Majid; Polibin, Roman V.; Postma, Maarten J.; Pourshams, Akram; Prashant, Akila; Pribadi, Dimas Ria Angga; Radfar, Amir; Rafei, Alireza; Rahim, Fakher; Rahimi-Movaghar, Vafa; Rahman, Mahfuzar; Rahman, Mosiur; Rahmani, Amir Masoud; Ranasinghe, Priyanga; Rao, Chythra R.; Rawaf, David Laith; Rawaf, Salman; Reitsma, Marissa B.; Remuzzi, Giuseppe; Renzaho, Andre M. N.; Reta, Melese Abate; Rezaei, Nima; Rezahosseini, Omid; Rezai, Mohammad Sadegh; Rezapour, Aziz; Roshandel, Gholamreza; Roshchin, Denis O.; Sabour, Siamak; Saif-Ur-rahman, K.M.; Salam, Nasir; Kafl, Hossein Samadi; Samaei, Mehrnoosh; Samy, Abdallah M.; Saroshe, Satish; Sartorius, Benn; Sathian, Brijesh; Sawyer, Susan M.; Senthilkumaran, Subramanian; Seylani, Allen; Shafaat, Omid; Shaikh, Masood Ali; Sharaf, Kiomars; Shetty, Ranjitha S.; Shigematsu, Mika; Shin, Jae Il; Silva, Jo�o Pedro; Singh, Jitendra Kumar; Sinha, Smriti; Skryabin, Valentin Yurievich; Skryabina, Anna Aleksandrovna; Spurlock, Emma Elizabeth; Sreeramareddy, Chandrashekhar T.; Steiropoulos, Paschalis; Sufyan, Mu'awiyyah Babale; Tabuchi, Takahiro; Tadesse, Eyayou Girma; Tamir, Zemenu; Tarkang, Elvis Enowbeyang; Tekalegn, Yohannes; Tesfay, Fisaha Haile; Tessema, Belay; Thapar, Rekha; Tleyjeh, Imad I.; Tobe-Gai, Ruoyan; Tran, Bach Xuan; Tsegaye, Berhan; Tsegaye, Gebiyaw Wudie; Ullah, Anayat; Umeokonkwo, Chukwuma David; Tahbaz, Sahel Valadan; Vo, Bay; Vu, Giang Thu; Waheed, Yasir; Walters, Magdalene K.; Whisnant, Joanna L.; Woldekidan, Mesfn Agachew; Wubishet, Befkadu Legesse; Jabbari, Seyed Hossein Yahyazadeh; Yazie, Taklo Simeneh Yazie; Yeshaw, Yigizie; Yi, Siyan; Yigit, Vahit; Yonemoto, Naohiro; Yu, Chuanhua; Yunusa, Ismaeel; Zastrozhin, Mikhail Sergeevich; Zastrozhina, Anasthasia; Zhang, Zhi-Jiang; Zumla, Alimuddin; Mokdad, Ali H.; Salomon, Joshua A.; Reiner, Robert C.; Lim, Stephen S.; Naghavi, Mohsen; Vos, Theo; Hay, Simon I.; Murray, Christopher J. L.; Kyu, Hmwe HmweBackground: Tuberculosis is a major contributor to the global burden of disease, causing more than a million deaths annually. Given an emphasis on equity in access to diagnosis and treatment of tuberculosis in global health targets, evaluations of differences in tuberculosis burden by sex are crucial. We aimed to assess the levels and trends of the global burden of tuberculosis, with an emphasis on investigating differences in sex by HIV status for 204 countries and territories from 1990 to 2019. Methods: We used a Bayesian hierarchical Cause of Death Ensemble model (CODEm) platform to analyse 21 505 site-years of vital registration data, 705 site-years of verbal autopsy data, 825 site-years of sample-based vital registration data, and 680 site-years of mortality surveillance data to estimate mortality due to tuberculosis among HIV-negative individuals. We used a population attributable fraction approach to estimate mortality related to HIV and tuberculosis coinfection. A compartmental meta-regression tool (DisMod-MR 2.1) was then used to synthesise all available data sources, including prevalence surveys, annual case notifications, population-based tuberculin surveys, and tuberculosis cause-specific mortality, to produce estimates of incidence, prevalence, and mortality that were internally consistent. We further estimated the fraction of tuberculosis mortality that is attributable to independent effects of risk factors, including smoking, alcohol use, and diabetes, for HIV-negative individuals. For individuals with HIV and tuberculosis coinfection, we assessed mortality attributable to HIV risk factors including unsafe sex, intimate partner violence (only estimated among females), and injection drug use. We present 95% uncertainty intervals for all estimates. Findings: Globally, in 2019, among HIV-negative individuals, there were 1�18 million (95% uncertainty interval 1�08�1�29) deaths due to tuberculosis and 8�50 million (7�45�9�73) incident cases of tuberculosis. Among HIV-positive individuals, there were 217 000 (153 000�279 000) deaths due to tuberculosis and 1�15 million (1�01�1�32) incident cases in 2019. More deaths and incident cases occurred in males than in females among HIV-negative individuals globally in 2019, with 342 000 (234 000�425 000) more deaths and 1�01 million (0�82�1�23) more incident cases in males than in females. Among HIV-positive individuals, 6250 (1820�11 400) more deaths and 81 100 (63 300�100 000) more incident cases occurred among females than among males in 2019. Age-standardised mortality rates among HIV-negative males were more than two times greater in 105 countries and age-standardised incidence rates were more than 1�5 times greater in 74 countries than among HIV-negative females in 2019. The fraction of global tuberculosis deaths among HIV-negative individuals attributable to alcohol use, smoking, and diabetes was 4�27 (3�69�5�02), 6�17 (5�48�7�02), and 1�17 (1�07�1�28) times higher, respectively, among males than among females in 2019. Among individuals with HIV and tuberculosis coinfection, the fraction of mortality attributable to injection drug use was 2�23 (2�03�2�44) times greater among males than females, whereas the fraction due to unsafe sex was 1�06 (1�05�1�08) times greater among females than males. Interpretation: As countries refine national tuberculosis programmes and strategies to end the tuberculosis epidemic, the excess burden experienced by males is important. Interventions are needed to actively communicate, especially to men, the importance of early diagnosis and treatment. These interventions should occur in parallel with efforts to minimise excess HIV burden among women in the highest HIV burden countries that are contributing to excess HIV and tuberculosis coinfection burden for females. Placing a focus on tuberculosis burden among HIV-negative males and HIV and tuberculosis coinfection among females might help to diminish the overall burden of tuberculosis. This strategy will be crucial in reaching both equity and burden targets outlined by global health milestones. Funding: Bill & Melinda Gates Foundation. � 2022 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 licenseItem Visible-Light-Induced Metal- and Photocatalyst-Free Radical Cascade Cyclization of Cinnamamides for Synthesis of Functionalized Dihydroquinolinones(American Chemical Society, 2023-07-18T00:00:00) Nishad, Chandra Shekhar; Suman, Pallav; Saha, Himadri; Banerjee, BiplabVisible-light-promoted metal- and photocatalyst-free radical cascade cyclization of cinnamamides with ?-oxocarboxylic acids is described for sustainable synthesis of diverse pharmaceutically important dihydroquinolinone scaffolds in one pot under mild conditions. The decarboxylative cascade cyclization proceeded efficiently at room temperature without the need for expensive photocatalysts such as Ir or Ru complexes, which indicates the practicability and environmentally benign nature of this protocol. Preliminary mechanistic studies reveal that the blue LED irradiation efficiently cleaves the I-O bond of the hypervalent iodine reagent PhI(O2CCOAr)2 formed through ligand exchange between iodobenzene diacetate and arylglyoxylic acid to initiate the cascade reaction. The synthetic value of this operationally simple and energy-efficient method is further demonstrated by late-stage functionalization of drug molecules in excellent yields. � 2023 American Chemical Society.Item A cascade A3 coupling strategy towards the regioselective synthesis of ?-carboline N-fused pyrrole derivatives with pyridine tethers(Royal Society of Chemistry, 2022-12-01T00:00:00) Vaishali, None; Malakar, Chandi C.; Singh, VirenderA potential three component reaction strategy has been devised to generate nature inspired ?-carboline N-fused pyrroles containing pyridine tethers. These scaffolds were afforded in high yields via a one-pot cascade regioselective reaction of diverse Kumujian C, 2-aminopyridines and alkyne derivatives under Cu(ii)-catalysis. A library of 32 novel indolizino[8,7-b]indole derivatives with pyridine tethers has been developed. The current protocol offers excellent regioselectivity, high atom-economy and significant structural diversity. � 2023 The Royal Society of Chemistry.Item Green synthesis of hybrid papain/Ni3(PO4)2 rods electrocatalyst for enhanced oxygen evolution reaction(Royal Society of Chemistry, 2022-10-21T00:00:00) Ahmed, Imtiaz; Biswas, Rathindranath; Singh, Harjinder; Patil, Ranjit A.; Varshney, Rohit; Patra, Debabrata; Ma, Yuan-Ron; Haldar, Krishna KantaHydrogen production using electrocatalytic water splitting provides encouraging innovations for enduring and clean energy generation as an option in contrast to traditional energy sources. Improvement in exceptionally dynamic electrocatalysts is of tremendous interest for work on the proficiency of gas generation, which has been emphatically blocked because of the sluggish kinetics of the oxygen evolution reaction (OER). We have synthesized a noble rod-shaped papain/Ni3(PO4)2 catalyst, which was further explored for electrocatalytic OER activity. An environmentally benign approach was applied to prepare binary papain/Ni3(PO4)2 in the presence of papain obtained from green papaya fruit. The yield of Ni3(PO4)2 rod structures could be controlled by varying the amount of papain extract during reaction conditions. The morphology and structural properties of the biogenic papain/Ni3(PO4)2 electrocatalyst were investigated with various microscopic and spectroscopic techniques, for example, FE-SEM, XRD, XPS, and FTIR. To show how such a papain/Ni3(PO4)2 hybrid structure could deliver more remarkable electrocatalytic OER activity, we inspected the correlation between catalytic demonstrations of the papain/Ni3(PO4)2 catalyst and its constituents, and the role of papain on its own was studied during the OER process. A biosynthesised papain/Ni3(PO4)2 catalyst exhibits excellent electrochemical OER performance with the smallest overpotentials of 217 mV, 319 mV and 431 mV in alkaline, neutral and acidic conditions, respectively, at 10 mA cm?2 current density. Transport of ions and electrons is also assisted by the long peptide backbone present in papain, which plays an important role in boosting OER activity. Our results reveal that papain/Ni3(PO4)2 shows better electrocatalytic OER execution along with cyclic stability compared to its different counterparts, owing to synergism-assisted enhancement by several amino acids from papain with metal ions in Ni3(PO4)2 � 2022 The Royal Society of Chemistry.