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Diaz D, Church J, Young M, Kim KT, Park J, Hwang YB, Santra S, Lee WH. Silica-quaternary ammonium "Fixed-Quat" nanofilm coated fiberglass mesh for water disinfection and harmful algal blooms control. J Environ Sci (China) 2019; 82:213-224. [PMID: 31133266 DOI: 10.1016/j.jes.2019.03.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/14/2019] [Accepted: 03/14/2019] [Indexed: 06/09/2023]
Abstract
Intensification of pollution loading worldwide has promoted an escalation of different types of disease-causing microorganisms, such as harmful algal blooms (HABs), instigating detrimental impacts on the quality of receiving surface waters. Formation of unwanted disinfection by-products (DBPs) resulting from conventional disinfection technologies reveals the need for the development of new sustainable alternatives. Quaternary Ammonium Compounds (QACs) are cationic surfactants widely known for their effective biocidal properties at the ppm level. In this study, a novel silica-based antimicrobial nanofilm was developed using a composite of silica-modified QAC (Fixed-Quat) and applied to a fiberglass mesh as an active surface via sol-gel technique. The synthesized Fixed-Quat nanocoating was found to be effective against E. coli with an inactivation rate of 1.3 × 10-3 log reduction/cm min. The Fixed-Quat coated fiberglass mesh also demonstrated successful control of Microcystis aeruginosa with more than 99% inactivation after 10 hr of exposure. The developed antimicrobial mesh was also evaluated with wild-type microalgal species collected in a water body experiencing HABs, obtaining a 97% removal efficiency. Overall, the silica-functionalized Fixed-Quat nanocoating showed promising antimicrobial properties for water disinfection and HABs control, while decreasing concerns related to DBPs formation and the possible release of toxic nanomaterials into the environment.
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Affiliation(s)
- Daniela Diaz
- Department of Civil, Environmental, and Construction Engineering, University of Central Florida, 12800 Pegasus Drive, Orlando, FL 32816, USA.
| | - Jared Church
- Department of Civil, Environmental, and Construction Engineering, University of Central Florida, 12800 Pegasus Drive, Orlando, FL 32816, USA
| | - Mikaeel Young
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA; Burnett School of Biomedical Sciences, University of Central Florida, 6850 Lake Nona Blvd, Orlando, FL 32827, USA
| | - Keug Tae Kim
- Department of Environmental & Energy Engineering, Suwon University, 17 Wauan-gil, Bongdam-eup, Hwaseong-si, Gyeonggi-do 445-743, Republic of Korea
| | - Jungsu Park
- K-water Institute, Korea Water Resources Corporation, 200 Sintanjin-Ro, Daedeok-Gu, Daejeon 34350, Republic of Korea
| | - Yun Bin Hwang
- Department of Environmental & Energy Engineering, Suwon University, 17 Wauan-gil, Bongdam-eup, Hwaseong-si, Gyeonggi-do 445-743, Republic of Korea
| | - Swadeshmukul Santra
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA; Burnett School of Biomedical Sciences, University of Central Florida, 6850 Lake Nona Blvd, Orlando, FL 32827, USA; Department of Material Science and Engineering, 4000 Central Florida Blvd, University of Central Florida, Orlando, FL 32816, USA; Department of Chemistry, 4111 Libra Drive, University of Central Florida, Orlando, FL 32816, USA
| | - Woo Hyoung Lee
- Department of Civil, Environmental, and Construction Engineering, University of Central Florida, 12800 Pegasus Drive, Orlando, FL 32816, USA.
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Hwang YB, Cheung YJ, Lee MK, Kim HK, Cho HH, Kim JH, Kim MR. Comparing with Open Surgery, Robot-Assisted Laparoscopic Adenomyomectomy Is a Feasible Option of Uterus-Sparing Surgery. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lee SW, Cho HH, Kim MR, You YO, Kim SY, Hwang YB, Kim JH. Association between pelvic organ prolapse and bone mineral density in postmenopausal women. J OBSTET GYNAECOL 2014; 35:476-80. [PMID: 25325183 DOI: 10.3109/01443615.2014.961906] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Both pelvic organ prolapse (POP) and osteoporosis are age-related diseases in older aged women. Both POP and bone metabolism may be associated with collagen metabolism. Our study determined the relationship between POP and bone mineral density (BMD) of the lumbar spine and femur neck in postmenopausal women. We selected 554 postmenopausal women (aged 50-79 years) and divided them into two groups (moderate to severe POP and absent to mild POP). We compared the BMDs of the lumbar spine and femur neck between the moderate to severe POP and absent to mild POP groups. Lumbar spine BMD was inversely correlated with POP severity (p = 0.001). However, after adjusting for age, time since menopause, height, weight, body mass index (BMI), and vaginal delivery, the BMDs of both the lumbar spine and femur neck were not significantly different between the moderate to severe POP and absent to mild POP groups (p = 0.583 and p = 0.305, respectively). A lower BMD is associated with increased fracture risk and we postulated that women with severe POP would have an increased risk of osteoporotic fracture.
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Affiliation(s)
- S W Lee
- a Department of Obstetrics and Gynecology , Hallym University Scared Heart Hospital, Hallym University College of Medicine , Anyang , Korea
| | - H H Cho
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
| | - M R Kim
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
| | - Y O You
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
| | - S Y Kim
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
| | - Y B Hwang
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
| | - J H Kim
- b Department of Obstetrics and Gynecology , The Catholic University of Medicine , Seoul , Korea
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Abstract
A new adaptive DO (dissolved oxygen) concentration control algorithm considering DO electrode dynamics with response time delay has been developed. A system model with two time-varying parameters was used to relate the DO concentration with two control variables: air flow rate and agitation speed. Parameters of this model were estimated on-line using a regularized constant trace recursive least-squares method. An extended Kalman filter was used to remove the effect of noises from the DO concentration measurements and thus to improve control performance. A discrete one-step ahead control scheme was adopted to determine control actions based on the parameter estimation results. Experimental results showed that the new adaptive DO concentration control algorithm performed better than other algorithms tested, a PID controller and adaptive algorithms without the DO electrode dynamics.
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Affiliation(s)
- S C Lee
- Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Seoul, Korea
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Park SY, Lee KH, Hwang YB, Kim KY, Park SK, Hwang HA, Sakanari JA, Hong KM, Kim SI, Park H. Characterization and large-scale expression of the recombinant cysteine proteinase from adult Clonorchis sinensis. J Parasitol 2001; 87:1454-8. [PMID: 11780837 DOI: 10.1645/0022-3395(2001)087[1454:calseo]2.0.co;2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Cysteine proteinases play important roles in the pathogenesis of several parasitic infections and have been proposed as targets for the structure-based approach of drug design. As the first step toward applying this strategy to design inhibitors as antiparasitic agents for Clonorchis sinensis, we overexpressed and characterized the 24-kDa cysteine proteinase from adult worms. First, the partial cysteine proteinase gene from C. sinensis was cloned by performing reverse transcription polymerase chain reaction (RT-PCR) with degenerate oligonucleotide primers derived from conserved cysteine proteinase sequences. The 5' and the 3' regions of the cysteine proteinase gene were amplified using the PCR protocol for the rapid amplification of cDNA ends-polymerase chain reaction (RACE-PCR). The cDNA has an open reading frame of 981 bp, and the deduced amino acid sequence shares similarity with the cathepsin L-like cysteine proteinases from Schistosoma mansoni, Paragonimus westermani metacercaria, Fasciola hepatica, and human cathepsin L by 52%, 47%, 34%, and 29%, respectively. The cysteine proteinase was then overexpressed in the yeast Pichia pastoris as an active enzyme on a large-scale basis (19.7 mg/L). The active recombinant enzyme was purified from culture media using a Ni2+-NTA-agarose affinity column and gel filtration chromatography. This 24-kDa recombinant protein exhibited a substrate preference for Z-Phe-Arg-AMC (benzyloxycarbonyl-L-phenylalanyl-L-arginine-7-amino-4-methyl-coumarin) compared with Z-Arg-Arg-AMC, and the activity was inhibited by E-64 (L-trans-epoxysuccinylleucylamido(4-quanidino)butane).
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Affiliation(s)
- S Y Park
- Department of Parasitology, College of Medicine, Wonkwang University, Iksan, Korea
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