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Gusliakova OI, Kurochkin MA, Barmin RA, Prikhozhdenko ES, Estifeeva TM, Rudakovskaya PG, Sindeeva OA, Galushka VV, Vavaev ES, Komlev AS, Lyubin EV, Fedyanin AA, Dey KK, Gorin DA. Magnetically navigated microbubbles coated with albumin/polyarginine and superparamagnetic iron oxide nanoparticles. Biomater Adv 2024; 158:213759. [PMID: 38227987 DOI: 10.1016/j.bioadv.2024.213759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/31/2023] [Accepted: 01/01/2024] [Indexed: 01/18/2024]
Abstract
While microbubbles (MB) are routinely used for ultrasound (US) imaging, magnetic MB are increasingly explored as they can be guided to specific sites of interest by applied magnetic field gradient. This requires the MB shell composition tuning to prolong MB stability and provide functionalization capabilities with magnetic nanoparticles. Hence, we developed air-filled MB stabilized by a protein-polymer complex of bovine serum albumin (BSA) and poly-L-arginine (pArg) of different molecular weights, showing that pArg of moderate molecular weight distribution (15-70 kDa) enabled MB with greater stability and acoustic response while preserving MB narrow diameters and the relative viability of THP-1 cells after 48 h of incubation. After MB functionalization with superparamagnetic iron oxide nanoparticles (SPION), magnetic moment values provided by single MB confirmed the sufficient SPION deposition onto BSA + pArg MB shells. During MB magnetic navigation in a blood vessel mimicking phantom with magnetic tweezers and in a Petri dish with adherent mouse renal carcinoma cell line, we demonstrated the effectiveness of magnetic MB localization in the desired area by magnetic field gradient. Magnetic MB co-localization with cells was further exploited for effective doxorubicin delivery with drug-loaded MB. Taken together, these findings open new avenues in control over albumin MB properties and magnetic navigation of SPION-loaded MB, which can envisage their applications in diagnostic and therapeutic needs.
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Affiliation(s)
- Olga I Gusliakova
- Science Medical Center, Saratov State University, Saratov 410012, Russia; Vladimir Zelman Center for Neurobiology and Brain Rehabilitation, Skolkovo Institute of Science and Technology, Moscow 121205, Russia.
| | - Maxim A Kurochkin
- Center for Photonic Science and Engineering, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | - Roman A Barmin
- Center for Photonic Science and Engineering, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | | | - Tatyana M Estifeeva
- Center for Photonic Science and Engineering, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | - Polina G Rudakovskaya
- Center for Photonic Science and Engineering, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | - Olga A Sindeeva
- Vladimir Zelman Center for Neurobiology and Brain Rehabilitation, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | - Victor V Galushka
- Education and Research Institute of Nanostructures and Biosystems, Saratov State University, Saratov 410012, Russia
| | - Evgeny S Vavaev
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Aleksei S Komlev
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Evgeny V Lyubin
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Andrey A Fedyanin
- Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Krishna Kanti Dey
- Department of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gujarat 382055, India
| | - Dmitry A Gorin
- Center for Photonic Science and Engineering, Skolkovo Institute of Science and Technology, Moscow 121205, Russia.
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Shukla AK, Bhandari S, Mitra S, Kim B, Dey KK. Buoyancy-Driven Micro/-Nanomotors: From Fundamentals to Applications. Small 2024:e2308580. [PMID: 38225699 DOI: 10.1002/smll.202308580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/30/2023] [Indexed: 01/17/2024]
Abstract
The progression of self-powered micro/-nanomotors (MNMs) has rapidly evolved over the past few decades, showing applications in various fields such as nanotechnology, biomedical engineering, microfluidics, environmental science, and energy harvesting. Miniaturized MNMs transduce chemical/biochemical energies into mechanical motion for navigating through complex fluidic environments with directional control via external forces fields such as magnetic, photonic, and electric stimuli. Among various propulsion mechanisms, buoyancy-driven MNMs have received noteworthy recognition due to their simplicity, efficiency, and versatility. Buoyancy force-driven motors harness the principles of density variation-mediated force to overcome fluidic resistance to navigate through complex environments. Restricting the propulsion in one direction helps to control directional movement, making it more efficient in isotropic solutions. The changes in pH, ionic strength, chemical concentration, solute gradients, or the presence of specific molecules can influence the motion of buoyancy-driven MNMs as evidenced by earlier reports. This review aims to provide a fundamental and detailed analysis of the current state-of-the-art in buoyancy-driven MNMs, aiming to inspire further research and innovation in this promising field.
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Affiliation(s)
- Ashish Kumar Shukla
- Laboratory of Soft and Living Materials, Department of Physics, Indian Institute of Technology, Palaj, Gandhinagar, Gujarat, 382055, India
- School of Mechatronics Engineering, Korea University of Technology and Education, Cheonan, Chungnam, 31253, Republic of Korea
| | - Satyapriya Bhandari
- Department of Chemistry, Kandi Raj College, University of Kalyani, Murshidabad, Kandi, West Bengal, 742137, India
| | - Shirsendu Mitra
- Department of Chemical Engineering, Pandit Deendayal Energy University, Gandhinagar, Gujarat, 382007, India
| | - Byungki Kim
- School of Mechatronics Engineering, Korea University of Technology and Education, Cheonan, Chungnam, 31253, Republic of Korea
- Future Convergence Engineering, Korea University of Technology and Education, Cheonan, Chungnam, 31253, Republic of Korea
| | - Krishna Kanti Dey
- Laboratory of Soft and Living Materials, Department of Physics, Indian Institute of Technology, Palaj, Gandhinagar, Gujarat, 382055, India
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Chakraborty R, Maiti A, Sharma N, Dey KK. Active matter dynamics in confined microfluidic environments. Prog Mol Biol Transl Sci 2022; 186:245-265. [PMID: 35033287 DOI: 10.1016/bs.pmbts.2021.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The field of active matter is a nascent area of research in soft condensed matter physics, which is drawing on the expertise of researchers from diverse disciplines. Small scale active particles-both inorganic and biological-display non-trivial emergent dynamics and interactions that could help us understand complex biological processes and phenomena. Recently, using microfluidic technologies, several research groups have performed important experimental and theoretical studies to understand the behavior of self-propelled particles and molecular active matter within confined environments-to glean a fundamental understanding of the cellular processes occurring under ultra-low Reynolds number conditions. In this chapter, we would like to review applications of microfluidics in active matter research, highlighting a few important theoretical and experimental investigations. We will conclude the discussion with a note on the future of this field mentioning a few open questions that are at the forefront of our minds.
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Affiliation(s)
- Rik Chakraborty
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Arnab Maiti
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Nikita Sharma
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Krishna Kanti Dey
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India.
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Naeem S, Naeem F, Mujtaba J, Shukla AK, Mitra S, Huang G, Gulina L, Rudakovskaya P, Cui J, Tolstoy V, Gorin D, Mei Y, Solovev AA, Dey KK. Oxygen Generation Using Catalytic Nano/Micromotors. Micromachines (Basel) 2021; 12:1251. [PMID: 34683302 PMCID: PMC8541545 DOI: 10.3390/mi12101251] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Revised: 09/30/2021] [Accepted: 10/05/2021] [Indexed: 02/06/2023]
Abstract
Gaseous oxygen plays a vital role in driving the metabolism of living organisms and has multiple agricultural, medical, and technological applications. Different methods have been discovered to produce oxygen, including plants, oxygen concentrators and catalytic reactions. However, many such approaches are relatively expensive, involve challenges, complexities in post-production processes or generate undesired reaction products. Catalytic oxygen generation using hydrogen peroxide is one of the simplest and cleanest methods to produce oxygen in the required quantities. Chemically powered micro/nanomotors, capable of self-propulsion in liquid media, offer convenient and economic platforms for on-the-fly generation of gaseous oxygen on demand. Micromotors have opened up opportunities for controlled oxygen generation and transport under complex conditions, critical medical diagnostics and therapy. Mobile oxygen micro-carriers help better understand the energy transduction efficiencies of micro/nanoscopic active matter by careful selection of catalytic materials, fuel compositions and concentrations, catalyst surface curvatures and catalytic particle size, which opens avenues for controllable oxygen release on the level of a single catalytic microreactor. This review discusses various micro/nanomotor systems capable of functioning as mobile oxygen generators while highlighting their features, efficiencies and application potentials in different fields.
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Affiliation(s)
- Sumayyah Naeem
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
- State Key Laboratory for Modification of Chemical Fibers and Polymer Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Farah Naeem
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
- State Key Laboratory for Modification of Chemical Fibers and Polymer Material Science and Engineering, Donghua University, Shanghai 201620, China
| | - Jawayria Mujtaba
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
| | - Ashish Kumar Shukla
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj 382355, Gujarat, India; (A.K.S.); (S.M.)
| | - Shirsendu Mitra
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj 382355, Gujarat, India; (A.K.S.); (S.M.)
| | - Gaoshan Huang
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
| | - Larisa Gulina
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Petergof, 198504 St. Petersburg, Russia; (L.G.); (V.T.)
| | - Polina Rudakovskaya
- Center of Photonics & Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia; (P.R.); (D.G.)
| | - Jizhai Cui
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
| | - Valeri Tolstoy
- Institute of Chemistry, Saint Petersburg State University, 26 Universitetskii Prospect, Petergof, 198504 St. Petersburg, Russia; (L.G.); (V.T.)
| | - Dmitry Gorin
- Center of Photonics & Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia; (P.R.); (D.G.)
| | - Yongfeng Mei
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
| | - Alexander A. Solovev
- Department of Materials Science, Fudan University, Shanghai 200433, China; (S.N.); (F.N.); (J.M.); (G.H.); (J.C.); (Y.M.)
| | - Krishna Kanti Dey
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj 382355, Gujarat, India; (A.K.S.); (S.M.)
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Maksimova EA, Barmin RA, Rudakovskaya PG, Sindeeva OA, Prikhozhdenko ES, Yashchenok AM, Khlebtsov BN, Solovev AA, Huang G, Mei Y, Kanti Dey K, Gorin DA. Air-Filled Microbubbles Based on Albumin Functionalized with Gold Nanocages and Zinc Phthalocyanine for Multimodal Imaging. Micromachines (Basel) 2021; 12:1161. [PMID: 34683212 PMCID: PMC8537308 DOI: 10.3390/mi12101161] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/23/2021] [Accepted: 09/25/2021] [Indexed: 01/01/2023]
Abstract
Microbubbles are intravascular contrast agents clinically used in diagnostic sonography, echocardiography, and radiology imaging applications. However, up to date, the idea of creating microbubbles with multiple functionalities (e.g., multimodal imaging, photodynamic therapy) remained a challenge. One possible solution is the modification of bubble shells by introducing specific compounds responsible for such functions. In the present work, air-core microbubbles with the shell consisting of bovine serum albumin, albumin-coated gold nanocages, and zinc phthalocyanine were prepared using the sonication method. Various physicochemical parameters such as stability over time, size, and concentration were investigated to prove the potential use of these microbubbles as contrast agents. This work shows that hybrid microbubbles have all the necessary properties for multimodal imaging (ultrasound, raster-scanning microscopy, and fluorescence tomography), which demonstrate superior characteristics for potential theranostic and related biomedical applications.
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Affiliation(s)
- Elizaveta A Maksimova
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
| | - Roman A Barmin
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
| | - Polina G Rudakovskaya
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
| | - Olga A Sindeeva
- Center for Neurobiology and Brain Restoration, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
| | | | - Alexey M Yashchenok
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
| | - Boris N Khlebtsov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, 410049 Saratov, Russia
| | | | - Gaoshan Huang
- Department of Materials Science, Fudan University, Shanghai 200433, China
| | - Yongfeng Mei
- Department of Materials Science, Fudan University, Shanghai 200433, China
| | - Krishna Kanti Dey
- Discipline of Physics, Indian Institute of Technology Gandhinagar Gandhinagar, Gujarat 382355, India
| | - Dmitry A Gorin
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobelya Str., 121205 Moscow, Russia
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6
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Affiliation(s)
- Krishna Kanti Dey
- Discipline of PhysicsIndian Institute of Technology Gandhinagar Gandhinagar Gujarat 382355 India
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7
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Affiliation(s)
- Krishna Kanti Dey
- Discipline of Physics; Indian Institute of Technology Gandhinagar; Gandhinagar Gujarat 382355 Indien
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Affiliation(s)
- Krishna Kanti Dey
- Department of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India
| | - Ayusman Sen
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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10
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Affiliation(s)
- Krishna Kanti Dey
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Frances Ying Pong
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Jens Breffke
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Ryan Pavlick
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Emmanuel Hatzakis
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Carlos Pacheco
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Ayusman Sen
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
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11
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Dey KK, Pong FY, Breffke J, Pavlick R, Hatzakis E, Pacheco C, Sen A. Dynamic Coupling at the Ångström Scale. Angew Chem Int Ed Engl 2015; 55:1113-7. [DOI: 10.1002/anie.201509237] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Krishna Kanti Dey
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Frances Ying Pong
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Jens Breffke
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Ryan Pavlick
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Emmanuel Hatzakis
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Carlos Pacheco
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
| | - Ayusman Sen
- Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
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Abstract
We demonstrate a procedure for the separation of enzymes based on their chemotactic response toward an imposed substrate concentration gradient. The separation is observed within a two-inlet, five-outlet microfluidic network, designed to allow mixtures of active (ones that catalyze substrate turnover) and inactive (ones that do not catalyze substrate turnover) enzymes, labeled with different fluorophores, to flow through one of the inlets. Substrate solution prepared in phosphate buffer was introduced through the other inlet of the device at the same flow rate. The steady-state concentration profiles of the enzymes were obtained at specific positions within the outlets of the microchannel using fluorescence microscopy. In the presence of a substrate concentration gradient, active enzyme molecules migrated preferentially toward the substrate channel. The excess migration of the active enzyme molecules was quantified in terms of an enrichment coefficient. Experiments were carried out with different pairs of enzymes. Coupling the physics of laminar flow of liquid and molecular diffusion, multiphysics simulations were carried out to estimate the extent of the chemotactic separation. Our results show that, with appropriate microfluidic arrangement, molecular chemotaxis leads to spontaneous separation of active enzyme molecules from their inactive counterparts of similar charge and size.
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Affiliation(s)
- Krishna Kanti Dey
- Department of Chemistry, ‡Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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13
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Abstract
We report a controlled migration of an iron nanoparticle (FeNP) coated polymer micromotor. The otherwise diffusive motion of the motor was meticulously directed through an in situ pH-gradient and an external magnetic field. The self-propulsion owing to the asymmetric catalytic decomposition of peroxide fuel was directed through a pH gradient imposed across the motor-surface, while the magnetic field induced an external control on the movement and the speed of the motor. Interestingly, the sole influence of the pH gradient could move the motor as high as ∼25 body lengths per second, which was further magnified by the external assistance from the magnetic field. Applying a magnetic field against the pH directed motion helped in the quantitative experimental estimation of the force-field required to arrest the chemotactic migration. The influence of the coupled internal and external fields could halt, steer or reverse the direction the motor inside a microchannel, rotate the motor around a target, and deliver the motor to a cluster of cells. This study showcases a multimodal chemical-magnetic field regulated migration of micro-machines for sensing, transport, and delivery inside a fluidic environment.
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Affiliation(s)
- Amit Kumar Singh
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati - 781039, India.
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Dey KK, Bhandari S, Bandyopadhyay D, Basu S, Chattopadhyay A. The pH taxis of an intelligent catalytic microbot. Small 2013; 9:1916-1920. [PMID: 23315996 DOI: 10.1002/smll.201202312] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 10/16/2012] [Indexed: 06/01/2023]
Affiliation(s)
- Krishna Kanti Dey
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, India
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Melzer MJ, Sugano JS, Cabanas D, Dey KK, Kandouh B, Mauro D, Rushanaedy I, Srivastava S, Watanabe S, Borth WB, Tripathi S, Matsumoto T, Keith L, Gonsalves D, Hu JS. First Report of Pepper mottle virus Infecting Tomato in Hawaii. Plant Dis 2012; 96:917. [PMID: 30727375 DOI: 10.1094/pdis-02-12-0147-pdn] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In August 2011, tomato (Solanum lycopersicum L.) fruit from a University of Hawaii field trial displayed mottling symptoms similar to that caused by Tomato spotted wilt virus (TSWV) or other tospoviruses. The foliage from affected plants, however, appeared symptomless. Fruit and leaf tissue from affected plants were negative for TSWV analyzed by double antibody sandwich (DAS)-ELISA and/or TSWV ImmunoStrips (Agdia, Elkhart, IN) when performed following the manufacturer's instructions. Total RNA from a symptomatic and an asymptomatic plant was isolated using an RNeasy Plant Mini Kit (Qiagen, Valencia, CA) and reverse transcribed using Invitrogen SuperScript III reverse transcriptase (Life Technologies, Grand Island, NY) and primer 900 (5'- CACTCCCTATTATCCAGG(T)16-3') following the enzyme manufacturer's instructions. The cDNA was then used as template in a universal potyvirus PCR assay using primers 900 and Sprimer, which amplify sequences encoding the partial inclusion body protein (NIb), coat protein, and 3' untranslated region of potyviruses (1). A ~1,700-bp product was amplified from the cDNA of the symptomatic plant but not the asymptomatic plant. This product was cloned using pGEM-T Easy (Promega, Madison, WI) and three clones were sequenced at the University of Hawaii's Advanced Studies in Genomics, Proteomics, and Bioinformatics laboratory. The 1,747-bp consensus sequence of the three clones was deposited in GenBank (Accession No. JQ429788) and, following primer sequence trimming, found to be 97% identical to positions 7,934 through 9,640 of Pepper mottle virus (PepMoV; family Potyviridae, genus Potyvirus) accessions from Korea (isolate '217' from tomato; EU586126) and California (isolate 'C' from pepper; M96425). To determine the incidence of PepMoV in the field trial, all 292 plants representing 14 tomato cultivars were assayed for the virus 17 weeks after planting using a PepMoV-specific DAS-ELISA (Agdia) following the manufacturer's directions. Plants were considered positive if their mean absorbance at 405 nm was greater than the mean absorbance + 3 standard deviations + 10% of the negative control samples. The virus incidence ranged from 4.8 to 47.6% for the different varieties, with an overall incidence of 19.9%. Although plant growth was not noticeably impaired by PepMoV infection, the majority of fruit from infected plants was unsaleable, making PepMoV a considerable threat to tomato production in Hawaii. PepMoV has been reported to naturally infect tomato in Guatemala (3) and South Korea (2). To our knowledge, this is the first report of this virus in Hawaii and the first report of this virus naturally infecting tomato in the United States. References: (1) J. Chen et al. Arch. Virol. 146:757, 2001. (2) M.-K. Kim et al. Plant Pathol. J. 24:152, 2008. (3) J. Th. J. Verhoeven et al. Plant Dis. 86:186, 2002.
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Affiliation(s)
- M J Melzer
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - J S Sugano
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - D Cabanas
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - K K Dey
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - B Kandouh
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - D Mauro
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - I Rushanaedy
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - S Srivastava
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - S Watanabe
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - W B Borth
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu96822
| | - S Tripathi
- USDA-ARS Pacific Basin Agricultural Research Center, Hilo, HI 96720
| | - T Matsumoto
- USDA-ARS Pacific Basin Agricultural Research Center, Hilo, HI 96720
| | - L Keith
- USDA-ARS Pacific Basin Agricultural Research Center, Hilo, HI 96720
| | - D Gonsalves
- USDA-ARS Pacific Basin Agricultural Research Center, Hilo, HI 96720
| | - J S Hu
- Plant and Environmental Protection Sciences, University of Hawaii, Honolulu, HI 96822
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Dey KK, Lin H, Borth WB, Melzer MJ, Hu JS. A highly sensitive single-tube nested PCR assay for the detection of Pineapple mealybug wilt associated virus-2 (PMWaV-2). J Virol Methods 2012; 183:215-8. [PMID: 22484612 DOI: 10.1016/j.jviromet.2012.03.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Revised: 03/15/2012] [Accepted: 03/21/2012] [Indexed: 11/18/2022]
Abstract
An assay was developed for the detection of Pineapple mealybug wilt associated virus-2 (PMWaV-2), an important factor in the etiology of mealybug wilt of pineapple. The assay combines reverse transcription of RNA isolated from pineapple with a specific and very sensitive, single, closed-tube nested polymerase chain reaction (PCR) to amplify a segment of the coat protein gene of the PMWaV-2. The outer primers were designed to anneal at higher temperatures than the nested primers to prevent primer competition in consecutive amplification reactions. To reduce potential competition further, the outer primers were used at one-thousandth the concentration of the nested primers. The specificity and sensitivity of this assay are much greater than PCR using only a single primer-pair. A TaqMan(®) probe was also designed for use in quantitative PCR to detect and quantify the PCR amplification products directly in a single-tube assay. The advantages of the single-tube assays using both conventional and quantitative PCR are reduced handling time and prevention of cross contamination compared to regular nested PCR in which the reactions are carried out in two separate tubes.
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Affiliation(s)
- K K Dey
- Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, 3190 Maile Way, Honolulu, HI 96822, USA
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Gogoi SK, Borah SM, Dey KK, Paul A, Chattopadhyay A. Optically definable reaction-diffusion-driven pattern generation of Ag-Au nanoparticles on templated surfaces. Langmuir 2011; 27:12263-12269. [PMID: 21899314 DOI: 10.1021/la202447x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We introduce a new lithographic method for the generation of 2D patterns of composite nanoparticles (NPs) of Ag and Au by taking recourse to combine top-down and bottom-up approaches. Micrometer-scale and submicrometer-scale patterned Ag foils of commercially available compact disks (CDs) and digital versatile disks (DVDs), respectively, were used as templates. The galvanic replacement reaction of Ag by HAuCl(4) in the presence of the dye coatings on the foils led to the formation of patterned NP composites of Ag and Au, in addition to the formation of AgCl. The resultant structures appeared in the form of cross patterns of particles with micrometer and submicrometer dimensions. The AgCl crystals thus formed could be removed by using either a saturated NaCl solution or aqueous ammonia. In addition, AgCl could be converted to Ag by electrochemical reduction, thus generating Ag-coated Au NPs. Interestingly, the digital writing on CDs led to the formation of tertiary imprints on the patterns, based on the original writing patterns. This provided an additional handle in generating hierarchical patterns using light in combination with a chemical reaction diffusion process and the nearly parallel line patterns originally present in commercial CDs. The reactions could be carried out in aqueous solution, and the method does not require any additional curing. Also, the density of patterned particles is scalable on the basis of the choice of the original line patterns as present in CDs and DVDs.
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Affiliation(s)
- Sonit Kumar Gogoi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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Boyle-Roden E, Hoefer N, Dey KK, Grandinetti PJ, Caffrey M. High resolution 1H NMR of a lipid cubic phase using a solution NMR probe. J Magn Reson 2007; 189:13-9. [PMID: 17855136 DOI: 10.1016/j.jmr.2007.08.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Revised: 08/08/2007] [Accepted: 08/11/2007] [Indexed: 05/17/2023]
Abstract
The cubic mesophase formed by monoacylglycerols and water is an important medium for the in meso crystallogenesis of membrane proteins. To investigate molecular level lipid and additive interactions within the cubic phase, a method was developed for improving the resolution of (1)H NMR spectra when using a conventional solution state NMR probe. Using this approach we obtained well-resolved J-coupling multiplets in the one-dimensional NMR spectrum of the cubic-Ia3d phase prepared with hydrated monoolein. A high resolution t-ROESY two-dimensional (1)H NMR spectrum of the cubic-Ia3d phase is also reported. Using this new methodology, we have investigated the interaction of two additive molecules, L-tryptophan and ruthenium-tris(2,2-bipyridyl) dichloride (rubipy), with the cubic mesophase. Based on the measured chemical shift differences when changing from an aqueous solution to the cubic phase, we conclude that L-tryptophan experiences specific interactions with the bilayer interface, whereas rubipy remains in the aqueous channels and does not associate with the lipid bilayer.
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Affiliation(s)
- E Boyle-Roden
- Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA
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