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Maneja RH, Miller JD, Flint JB, Alcaria JFA, Basali AU, Flandez AVB, Gopalan J, Duraisamy T, Abrogueña JBR, Bawazier AA, Das PB, Manokaran S, Asiri YY, Qasem A, Asfahani K, Qurban MAB. Extreme conditions reduce hatching success of green turtles (Chelonia mydas L.) at Karan Island, the major nesting site in the Arabian Gulf. Mar Pollut Bull 2023; 190:114801. [PMID: 36965265 DOI: 10.1016/j.marpolbul.2023.114801] [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: 10/17/2022] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Survival in the early life stages is a major factor determining the growth and stability of wildlife populations. For sea turtles, nest location must provide favorable conditions to support embryonic development. Hatching success and incubation environment of green turtle eggs were examined in July 2019 at Karan Island, a major nesting site for the species in the Arabian Gulf. Mean hatching success averaged at 38.8 % (range = 2.5-75.0 %, n = 14). Eggs that suffered early embryonic death (EED) and late embryonic death (LED) represented 19.8 % (range: 3.3-64.2 %) and 41.4 % (range: 4.8-92.6 %) of the clutch on average, respectively. Nest sand was either coarse (0.5-1 mm: mean 44.8 %, range = 30.4-56.9 % by dry weight, n = 14) or medium (0.25-0.5 mm: mean 33.6 %, range = 12.0-45.5 % by dry weight, n = 14). Mean sand moisture (4.0 %, range = 3.2-4.9 %, n = 14) was at the lower margin for successful development. Hatching success was significantly higher in clutches with sand salinity <1500 EC.uS/cm (n = 5) than those above 2500 EC.uS/cm (n = 5). Mean clutch temperatures at 1200 h increased by an average of 5.4 °C during the 50-d post-oviposition from 31.2 °C to 36.6 °C. Embryos experienced lethally high temperatures in addition to impacts of other environmental factors (salinity, moisture, sand grain size), which was related to reduced hatching success. Conservation initiatives must consider the synergistic influence of the above parameters in formulating strategies to improve the overall resilience of the green turtle population in the Arabian Gulf to anthropogenic and climate change-related stressors.
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Affiliation(s)
- R H Maneja
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
| | - J D Miller
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - J B Flint
- One Welfare and Sustainability Center, Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus 43210, OH, USA
| | - J F A Alcaria
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - A U Basali
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - A V B Flandez
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - J Gopalan
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - T Duraisamy
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - J B R Abrogueña
- Environmental Protection and Control Department, Royal Commission for Jubail and Yanbu, Jazan City for Primary and Downstream Industries, Saudi Arabia
| | - A A Bawazier
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - P B Das
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - S Manokaran
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Y Y Asiri
- Center for Environment and Marine Studies, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - A Qasem
- Environmental Protection Department, Saudi Aramco, Dhahran, Saudi Arabia
| | - K Asfahani
- Environmental Protection Department, Saudi Aramco, Dhahran, Saudi Arabia
| | - M A B Qurban
- National Center for Wildlife, Riyadh, Saudi Arabia
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Al Ameri HM, Al Harthi S, Al Kiyumi A, Al Sariri TS, Al-Zaidan ASY, Antonopoulou M, Broderick AC, Chatting M, Das HS, Hesni MA, Mancini A, Miller JD, Mobaraki A, Rezaie-Atagholipour M, Pilcher NJ, Rees AF, Rodríguez-Zárate CJ, Smyth DM, Tanabe LK, Yaghmour F, Yusuf AA, Godley BJ. CORRIGENDUM: Biology and conservation of marine turtles in the northwestern Indian Ocean: a review. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01183_c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- HM Al Ameri
- Centre for Ecology and Conservation, College of Life and Environmental Sciences, Penryn Campus, University of Exeter, Cornwall TR10 9FE, UK
- Marine Assessment and Conservation Section, Terrestrial and Marine Biodiversity Sector, Environment Agency-Abu Dhabi, PO Box 45553, Abu Dhabi, United Arab Emirates
| | - S Al Harthi
- Environment Society of Oman, PO Box 3955, Ruwi PC112, Muscat, Sultanate of Oman
| | - A Al Kiyumi
- PO Box 106 PC134, Jawharat Al Shatie, Muscat, Sultanate of Oman
| | - TS Al Sariri
- Environment Authority, PO Box 323, Muscat, Sultanate of Oman
| | - ASY Al-Zaidan
- Department of Biological Sciences, Faculty of Science, Kuwait University, Safat 13060, Kuwait
| | - M Antonopoulou
- Emirates Nature-WWF, PO Box 73323, Abu Dhabi, United Arab Emirates
| | - AC Broderick
- Centre for Ecology and Conservation, College of Life and Environmental Sciences, Penryn Campus, University of Exeter, Cornwall TR10 9FE, UK
| | - M Chatting
- Environmental Science Centre, Qatar University, PO Box 2713, Doha, Qatar
| | - HS Das
- Marine Assessment and Conservation Section, Terrestrial and Marine Biodiversity Sector, Environment Agency-Abu Dhabi, PO Box 45553, Abu Dhabi, United Arab Emirates
| | - MA Hesni
- Zoological Museum of Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - A Mancini
- Grupo Tortuguero de las Californias AC, Calle Seis 141, 23098 La Paz, Baja California Sur, Mexico
| | - JD Miller
- Biological Research and Education Consultants, Missoula, Montana 59801, USA
| | - A Mobaraki
- Department of Environmental Sciences, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Hesarak Boulevard, Tehran, Iran
| | - M Rezaie-Atagholipour
- Qeshm Environmental Conservation Institute (QECI), Qeshm Island, Hormozgan Province, Iran
| | - NJ Pilcher
- Marine Research Foundation, 88450 Kota Kinabalu, Sabah, Malaysia
| | - AF Rees
- Centre for Ecology and Conservation, College of Life and Environmental Sciences, Penryn Campus, University of Exeter, Cornwall TR10 9FE, UK
| | - CJ Rodríguez-Zárate
- Sharjah Desert Park, Scientific Research Department, Environment and Protected Areas Authority, Sharjah, United Arab Emirates
| | - DM Smyth
- School of Ocean Science, Marine Centre Wales, Bangor University, Bangor LL59 5AB, UK
| | - LK Tanabe
- Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - F Yaghmour
- Scientific Research Department, Hefaiyah Mountain Conservation Centre, Environment and Protected Areas Authority, Kalba, Sharjah, United Arab Emirates
| | - AA Yusuf
- Ministry of Fisheries and Marine Resources, Wardhiigley, Mogadishu, Somalia
| | - BJ Godley
- Centre for Ecology and Conservation, College of Life and Environmental Sciences, Penryn Campus, University of Exeter, Cornwall TR10 9FE, UK
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Al Ameri HM, Al Harthi S, Al Kiyumi A, Al Sariri TS, Al-Zaidan ASY, Antonopoulou M, Broderick AC, Chatting M, Das HS, Hesni MA, Mancini A, Miller JD, Mobaraki A, Rezaie-Atagholipour M, Pilcher NJ, Rees AF, Rodriguez-Zarate CJ, Smyth DM, Tanabe LK, Yaghmour F, Yusuf AA, Godley BJ. Biology and conservation of marine turtles in the North-Western Indian Ocean: a review. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Wallace BP, Stacy BA, Cuevas E, Holyoake C, Lara PH, Marcondes ACJ, Miller JD, Nijkamp H, Pilcher NJ, Robinson I, Rutherford N, Shigenaka G. Oil spills and sea turtles: documented effects and considerations for response and assessment efforts. ENDANGER SPECIES RES 2020. [DOI: 10.3354/esr01009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Sydenham EW, Shephard GS, Thiel PG, Stockenström S, Snijman PW, Van Schalkwyk DJ, Castegnaro M, Kamimura H, Lauren DR, Miller JD, Nawaz S, Pascale M, Pittet A, Savard ME, Schillack VR, Scudamore K, Sizoo EA, Smith WA, Stack ME, Ueno Y, Viljoen CC, Visconti A, van der Westhuizen L. Liquid Chromatographic Determination of Fumonisins B1, B2, and B3 in Corn: AOAC–IUPAC Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/79.3.688] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
A liquid chromatographic (LC) method for simultaneous determination of fumonisins B1 (FB1), B2 (FB2), and B3 (FB3) in corn was subjected to a collaborative study involving 12 participants from 10 countries, in which the accuracy and reproducibility characteristics of the method were established. Mean analyte recoveries from corn ranged from 81.1 to 84.2% for FB1 (at a spiking range of 500 to 8000 ng/g), from 75.9 to 81.9% for FB2 (at a spiking range of 200 to 3200 ng/g), and from 75.8 to 86.8% for FB3 (at a spiking range of 100 to 1600 ng/g). The valid data were statistically evaluated after exclusion of outliers. Relative standard deviations for within-laboratory repeatability ranged from 5.8 to 13.2% for FB1, from 7.2 to 17.5% for FB2, and from 8.0 to 17.2% for FB3. Relative standard deviations for between-laboratory reproducibility varied from 13.9 to 22.2% for FB1, from 15.8 to 26.7% for FB2, and from 19.5 to 24.9% for FB3. HORRAT ratios, calculated for the individual toxin analogues, ranged from 0.75 to 1.73. The LC method for determination of fumonisins B1, B2, and B3 in corn (at concentrations of 800–12800 ng total fumonisins/g) has been adopted by AOAC INTERNATIONAL.
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Affiliation(s)
- Eric W Sydenham
- Medical Research Council, Programme on Mycotoxins and Experimental Carcinogenesis, PO Box 19070, Tygerberg 7505, South Africa
| | - Gordon S Shephard
- Medical Research Council, Programme on Mycotoxins and Experimental Carcinogenesis, PO Box 19070, Tygerberg 7505, South Africa
| | - Pieter G Thiel
- Medical Research Council, Programme on Mycotoxins and Experimental Carcinogenesis, PO Box 19070, Tygerberg 7505, South Africa
| | - Sonja Stockenström
- Medical Research Council, Programme on Mycotoxins and Experimental Carcinogenesis, PO Box 19070, Tygerberg 7505, South Africa
| | - Petra W Snijman
- Medical Research Council, Programme on Mycotoxins and Experimental Carcinogenesis, PO Box 19070, Tygerberg 7505, South Africa
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7
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Gungoren C, Ozdemir O, Wang X, Ozkan SG, Miller JD. Effect of ultrasound on bubble-particle interaction in quartz-amine flotation system. Ultrason Sonochem 2019; 52:446-454. [PMID: 30595489 DOI: 10.1016/j.ultsonch.2018.12.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 12/12/2018] [Accepted: 12/13/2018] [Indexed: 05/22/2023]
Abstract
In this study, the effect of ultrasound (US) on the quartz-amine flotation system was investigated in detail by considering various surface chemistry techniques. The effect of ultrasound on particle size, shape factor, and surface roughness were characterized by using Brunauer-Emmett-Teller (BET) surface area measurements and scanning electron microscopy (SEM) analyses. The contact angle and bubble-particle attachment time, as well as adsorption density measurements was carried out to evaluate the effect of ultrasound on quartz surface wetting ability. In addition, atomic force microscopy (AFM) analyses were conducted, and finally micro-flotation studies were performed. As a result, it was found that the micro-flotation recovery at 2 × 10-5 M dodecyl amine hydrochloride (DAH) concentration increased from 45.45% to 63.64% with 30 W ultrasonic application at conditioning step. However, the micro-flotation recovery decreased to 37.50% when the ultrasonic power increased to 150 W. The results showed some effect of ultrasound on particle size, particle shape, and surface roughness in some extent. The increase in the contact angle and the decrease in the bubble-particle attachment time were observed. A slightly high adsorption density was measured. All these show a positive effect of ultrasound on quartz flotation with amine as a collector.
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Affiliation(s)
- C Gungoren
- Istanbul University-Cerrahpasa Engineering Faculty Mining Engineering Department, 34320, Avcilar, Istanbul, Turkey
| | - O Ozdemir
- Istanbul University-Cerrahpasa Engineering Faculty Mining Engineering Department, 34320, Avcilar, Istanbul, Turkey
| | - X Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - S G Ozkan
- Istanbul University-Cerrahpasa Engineering Faculty Mining Engineering Department, 34320, Avcilar, Istanbul, Turkey.
| | - J D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City, UT 84112, USA
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Abstract
The features of interfacial water at air-water interfaces of anionic sodium dodecyl sulfate (SDS) and cationic dodecyl amine hydrochloride (DDA) solutions were examined by combining sum frequency generation (SFG) vibrational spectroscopy measurements and molecular dynamics simulations (MDS). The SFG spectra revealed that interfacial water molecules for SDS solutions were highly ordered compared with those for DDA solutions. To elucidate this observation, in addition to agreement with the literature in regards to the interfacial electric field at the interfaces, we investigated the features of interfacial water molecules with respect to their network and their interaction with surfactant head groups. Our simulation analysis results revealed a higher number density, more strongly connected hydrogen bonding, and more orderly oriented interfacial water molecules at the interface of the SDS solutions as compared to the DDA solutions. The goal of this research is to identify significant features of interfacial water for our improved understanding of such interfacial phenomena.
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Affiliation(s)
- Vu N T Truong
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East , Rm 412, Salt Lake City , Utah 84112 , United States
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East , Rm 412, Salt Lake City , Utah 84112 , United States
| | - Liem X Dang
- Physical Sciences Division , Pacific Northwest National Laboratory , 902 Battelle Boulevard , Richland , Washington 99352 , United States
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East , Rm 412, Salt Lake City , Utah 84112 , United States
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9
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Zhu Q, Wang X, Miller JD. Advanced Nanoclay-Based Nanocomposite Solid Polymer Electrolyte for Lithium Iron Phosphate Batteries. ACS Appl Mater Interfaces 2019; 11:8954-8960. [PMID: 30724067 DOI: 10.1021/acsami.8b13735] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
High-performance solid polymer electrolytes (SPEs) have long been desired for the next generation of lithium batteries. One of the most promising ways to improve the morphological and electrochemical properties of SPEs is the addition of fillers with specific nanostructures. However, the production of such fillers is generally expensive and requires complicated preparation procedures. Halloysite nanotubes (HNTs), with their tubular structure, resemble carbon nanotubes in terms of geometric features and can be obtained at a relatively low cost. Previously, we reported that the HNT poly(ethylene oxide) composite SPE possesses excellent electrochemical and mechanical properties and outstanding cycling performance for all-solid-state lithium sulfur batteries. However, the HNT/SPE was not effective for lithium iron phosphate (LFP) batteries. The compatibility between the electrodes and the electrolyte sharply decreased, and no decent cycling performance was achieved. Therefore, a modification was studied which involves a minor addition of LFP during the preparation procedure. With this modification, good ionic conductivity (9.23 × 10-5 S cm-1 at 25 °C) is achieved, and compatibility between the electrodes and the electrolyte is enhanced. At the same time, an electrochemical stability window of 5.14 V and lithium-ion transference number of 0.46 are found. All-solid-state LFP batteries possessing excellent cycling performance are further demonstrated.
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Affiliation(s)
- Qinyu Zhu
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 S 1460 E, Room 412 , Salt Lake City , Utah 84112-0114 , United States
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 S 1460 E, Room 412 , Salt Lake City , Utah 84112-0114 , United States
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 S 1460 E, Room 412 , Salt Lake City , Utah 84112-0114 , United States
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Atluri V, Jin J, Shrimali K, Dang L, Wang X, Miller JD. The hydrophobic surface state of talc as influenced by aluminum substitution in the tetrahedral layer. J Colloid Interface Sci 2019; 536:737-748. [PMID: 30415178 DOI: 10.1016/j.jcis.2018.10.085] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/24/2018] [Accepted: 10/26/2018] [Indexed: 10/28/2022]
Abstract
Talc is both an important industrial mineral product recovered by flotation, and also in other cases, a gangue mineral of concern in the flotation of certain sulfide ores, such as the PGM ores from South Africa and from the United States. The talc face surface is naturally hydrophobic with a water sessile drop contact angle of nearly 80°, which accounts for its flotation recovery in one case, and its contamination of sulfide mineral concentrates in other instances. Due to the presence of impurities in the talc structure the surface properties change. One such effect is the presence of aluminum, which can replace silicon in the silica tetrahedral layer of the talc structure. This results in a charge imbalance on the face surface because Si+4 is replaced by Al+3. Sessile drop contact angle and bubble attachment time measurements were made, and these results were compared to the results from molecular dynamics simulations (MDS). The extent of aluminum substitution in the silica tetrahedral layer was considered, and the sessile drop contact angle was found to decrease with increased aluminum content, decreasing from about 80° for no substitution (talc) to 0° for extensive substitution (phlogopite). The water film was found to be stable at the surface of highly aluminum substituted crystals due to the interaction between water molecules and the increased polarity of the surface state. This stable water film restricts the air bubble from attaching to such face surfaces. However, in the absence of aluminum substitution, no interactions between the water molecules and the face surface were observed and the air bubble readily attached to the face surface. This study provides additional understanding of how aluminum substitution in the tetrahedral layer affects the fundamental surface properties of talc, paving the way for the design of improved reagents for talc flotation as an industrial mineral product, and for talc depression in the recovery of sulfide mineral concentrates.
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Affiliation(s)
- Venkata Atluri
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 S 1460 E, Room 412, Salt Lake City, UT 84112-0114, USA
| | - Jiaqi Jin
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 S 1460 E, Room 412, Salt Lake City, UT 84112-0114, USA
| | - Kaustubh Shrimali
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 S 1460 E, Room 412, Salt Lake City, UT 84112-0114, USA
| | - Liem Dang
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352, USA.
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 S 1460 E, Room 412, Salt Lake City, UT 84112-0114, USA.
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 S 1460 E, Room 412, Salt Lake City, UT 84112-0114, USA.
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Usategui-Martín A, Liria-Loza A, Miller JD, Medina-Suárez M, Jiménez-Bordón S, Pérez-Mellado V, Montero D. Effects of incubation temperature on hatchling performance and phenotype in loggerhead sea turtle Caretta caretta. ENDANGER SPECIES RES 2019. [DOI: 10.3354/esr00935] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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12
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Bacchuwar S, Vidyapati V, Quan KM, Lin CL, Miller JD. Quantitative bin flow analysis of particle discharge using X-ray radiography. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.12.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Zhu G, Wang Y, Wang X, Yu F, Miller JD. States of coadsorption for oleate and dodecylamine at selected spodumene surfaces. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.083] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Vaziri Hassas B, Jin J, Dang LX, Wang X, Miller JD. Attachment, Coalescence, and Spreading of Carbon Dioxide Nanobubbles at Pyrite Surfaces. Langmuir 2018; 34:14317-14327. [PMID: 30373363 DOI: 10.1021/acs.langmuir.8b02929] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recently, it was reported that using CO2 as a flotation gas increases the flotation of auriferous pyrite from high carbonate gold ores of the Carlin Trend. In this regard, the influence of CO2 on bubble attachment at fresh pyrite surfaces was measured in the absence of collector using an induction timer, and it was found that nitrogen bubble attachment time was significantly reduced from 30 ms to less than 10 ms in CO2 saturated solutions. Details of CO2 bubble attachment at a fresh pyrite surface have been examined by atomic force microscopy (AFM) measurements and molecular dynamics (MD) simulations, and the results used to describe the subsequent attachment of a N2 bubble. As found from MD simulations, unlike the attached N2 bubble, which is stable and has a contact angle of about 90°, the CO2 bubble attaches, and spreads, wetting the fresh pyrite surface and forming a multilayer of CO2 molecules, corresponding to a contact angle of almost 180°. These MDS results are complemented by in situ AFM images, which show that, after attachment, CO2 nano-/microbubbles spread to form pancake bubbles at the fresh pyrite surface. In summary, it seems that CO2 bubbles have a propensity to spread, and whether CO2 exists as layers of CO2 molecules (gas pancakes) or as nano-/microbubbles, their presence at the fresh pyrite surface subsequently facilitates film rupture and attachment of millimeter N2 bubbles and, in this way, improves the flotation of pyrite.
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Affiliation(s)
- Behzad Vaziri Hassas
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East, Rm 412 , Salt Lake City , Utah 84112 , United States
| | - Jiaqi Jin
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East, Rm 412 , Salt Lake City , Utah 84112 , United States
| | - Liem X Dang
- Chemical and Material Sciences Division , Pacific Northwest National Laboratory , 902 Battelle Boulevard , Richland , Washington 99353 , United States
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East, Rm 412 , Salt Lake City , Utah 84112 , United States
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences , University of Utah , 135 South 1460 East, Rm 412 , Salt Lake City , Utah 84112 , United States
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Jiang F, Chen Y, Ju S, Zhu Q, Zhang L, Peng J, Wang X, Miller JD. Ultrasound-assisted leaching of cobalt and lithium from spent lithium-ion batteries. Ultrason Sonochem 2018; 48:88-95. [PMID: 30080590 DOI: 10.1016/j.ultsonch.2018.05.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/10/2018] [Accepted: 05/16/2018] [Indexed: 06/08/2023]
Abstract
Recovery of cobalt and lithium from spent Li-ion batteries (LIBs) has been studied using ultrasound-assisted leaching. The primary purpose of this work is to investigate the effects of ultrasound on leaching efficiency of cobalt and lithium. The results were compared to conventional leaching. In this study sulfuric acid was used as leaching agent in the presence of hydrogen peroxide. The cathode active materials from spent battery were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) before and after leaching. Effects of leaching time, leaching temperature, H2SO4 concentration, H2O2 concentration, solid/liquid ratio, and ultrasonic power have been studied. Optimal leaching efficiency of 94.63% for cobalt, and 98.62% for lithium, respectively, was achieved by using 2 M H2SO4 with 5% (v/v) H2O2 at a solid/liquid ratio of 100 g/L, and an ultrasonic power of 360 W, and the leaching time being 30 min under 30 °C. Compared with conventional leaching, the ultrasound-assisted leaching gave a higher leaching rate and improved leaching efficiency under the same experimental conditionals. The kinetic analysis of ultrasound-assisted leaching showed that the activation energy of cobalt and lithium were 3.848 KJ/mol and 11.6348 KJ/mol, respectively, indicating that ultrasound-assisted leaching of cobalt and lithium from spent LIBs was controlled by diffusion.
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Affiliation(s)
- Feng Jiang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, Yunnan 650093, China
| | - Yuqian Chen
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, Yunnan 650093, China
| | - Shaohua Ju
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, Yunnan 650093, China
| | - Qinyu Zhu
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA
| | - Libo Zhang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, Yunnan 650093, China.
| | - Jinhui Peng
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, Yunnan 650093, China
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA.
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA
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Wildermann NE, Gredzens C, Avens L, Barrios-Garrido HA, Bell I, Blumenthal J, Bolten AB, Braun McNeill J, Casale P, Di Domenico M, Domit C, Epperly SP, Godfrey MH, Godley BJ, González-Carman V, Hamann M, Hart KM, Ishihara T, Mansfield KL, Metz TL, Miller JD, Pilcher NJ, Read MA, Sasso C, Seminoff JA, Seney EE, Willard AS, Tomás J, Vélez-Rubio GM, Ware M, Williams JL, Wyneken J, Fuentes MMPB. Informing research priorities for immature sea turtles through expert elicitation. ENDANGER SPECIES RES 2018. [DOI: 10.3354/esr00916] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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17
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Lin Y, Cheng Y, Li J, Miller JD, Liu J, Wang X. Biocompatible and biodegradable solid polymer electrolytes for high voltage and high temperature lithium batteries. RSC Adv 2017. [DOI: 10.1039/c7ra01601h] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Wheat flour modified solid polymer electrolytes were synthesized and used in high safety and long cycling lithium batteries.
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Affiliation(s)
- Yue Lin
- School of Metallurgy and Environment
- Central South University
- Changsha
- China
| | - Yun Cheng
- School of Metallurgy and Environment
- Central South University
- Changsha
- China
| | - Jie Li
- School of Metallurgy and Environment
- Central South University
- Changsha
- China
| | - Jan D. Miller
- Department of Metallurgical Engineering
- University of Utah
- Salt Lake City
- USA
| | - Jin Liu
- School of Metallurgy and Environment
- Central South University
- Changsha
- China
| | - Xuming Wang
- Department of Metallurgical Engineering
- University of Utah
- Salt Lake City
- USA
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Martin JR, Bonafede MM, Nelson JK, Booth AJ, Miller JD. Treatment Patterns Among Women with Newly Diagnosed Abnormal Uterine Bleeding. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Shrimali K, Jin J, Hassas BV, Wang X, Miller JD. The surface state of hematite and its wetting characteristics. J Colloid Interface Sci 2016; 477:16-24. [DOI: 10.1016/j.jcis.2016.05.030] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 05/16/2016] [Accepted: 05/17/2016] [Indexed: 10/21/2022]
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21
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Basinski C, Lukes A, Miller JD, Lenhart G, Bonafede M, Troeger K. Treatment Complication and Reintervention Rates Following Endometrial Ablation with the NovaSure® System Versus Other Global Endometrial Ablation Modalities. J Minim Invasive Gynecol 2014. [DOI: 10.1016/j.jmig.2014.08.221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Desroches TC, McMullin DR, Miller JD. Extrolites of Wallemia sebi, a very common fungus in the built environment. Indoor Air 2014; 24:533-542. [PMID: 24471934 DOI: 10.1111/ina.12100] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [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: 11/13/2013] [Accepted: 01/21/2014] [Indexed: 06/03/2023]
Abstract
Wallemia sebi has been primarily known as a spoilage fungus of dried, salted fish and other foods that are salty or sweet. However, this fungus is also very common in house dust. The health effects of chronic exposure to mold and dampness are known to be associated with both allergens and various inflammatory compounds, including the secondary metabolites of building associated fungi and their allergens. IgE sensitization to W. sebi has been long reported from housing and occupational exposures. However, its allergens have not been described previously. Strains from food have been reported to produce a number of compounds with modest toxicity. Strains from the built environment in Canada produced a number of metabolites including the known compound walleminone and a new compound 1-benzylhexahydroimidazo [1,5-α] pyridine-3,5-dione which we call wallimidione. Based on an in silico analysis, wallimidione is likely the most toxic of the metabolites reported to date from W. sebi. We found that the primary human antigen of W. sebi is a 47 kDa excreted cellulase present in high concentrations in W. sebi arthrospores. This species is a basidiomycete and, unsurprisingly, the antigen was not found in extracts of other fungi common in the built environment, all ascomycetes.
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Affiliation(s)
- T C Desroches
- Ottawa Carleton Institute of Chemistry, Carleton University, Ottawa, ON, Canada
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23
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Liu J, Miller JD, Yin X, Gupta V, Wang X. Influence of ionic strength on the surface charge and interaction of layered silicate particles. J Colloid Interface Sci 2014; 432:270-7. [PMID: 25086721 DOI: 10.1016/j.jcis.2014.06.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/11/2014] [Accepted: 06/12/2014] [Indexed: 11/30/2022]
Abstract
The surface charge densities and surface potentials of selected phyllosilicate surfaces were calculated from AFM surface force measurements and reported as a function of ionic strength at pH 5.6. The results show that the silica faces of clay minerals follow the constant surface charge model because of isomorphous substitution in the silica tetrahedral layer. A decreasing surface charge density sequence was observed as follows: muscovite silica face>kaolinite silica face>talc silica face, which is expected to be due to the extent of isomorphous substitution. In contrast, at pH 5.6, the alumina face and the edge surface of kaolinite follow the constant surface potential model with increasing ionic strength, and the surface charge density increased with increasing ionic strength. The cluster size of suspended kaolinite particles at pH 5.6 was found to increase with increasing ionic strength due to an increase in the surface charge density for the alumina face and the edge surface. However, the cluster size decreased at 100mM KCl as a result of an unexpected decrease in the surface charge of the alumina face. When the ionic strength continued to increase above 100mM KCl, the van der Waals attraction dominated and larger clusters of micron size were stabilized.
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Affiliation(s)
- Jing Liu
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA.
| | - Jan D Miller
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA.
| | - Xihui Yin
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA.
| | - Vishal Gupta
- Summit Valley Technologies, FLSmidth USA Inc. - Salt Lake City Operations, 7158 S FLSmidth Drive, Midvale, UT 84047, USA.
| | - Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA.
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24
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Jin J, Miller JD, Dang LX. Molecular dynamics simulation and analysis of interfacial water at selected sulfide mineral surfaces under anaerobic conditions. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.minpro.2014.03.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Cheng F, Cao Q, Guan Y, Cheng H, Wang X, Miller JD. FTIR analysis of water structure and its influence on the flotation of arcanite (K2SO4) and epsomite (MgSO4·7H2O). ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.minpro.2013.04.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Rand TG, Robbins C, Rajaraman D, Sun M, Miller JD. Induction of Dectin-1 and asthma-associated signal transduction pathways in RAW 264.7 cells by a triple-helical (1, 3)-β-D glucan, curdlan. Arch Toxicol 2013; 87:1841-50. [PMID: 23543010 DOI: 10.1007/s00204-013-1042-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 03/08/2013] [Indexed: 11/25/2022]
Abstract
People living in damp buildings are typically exposed to spore and mycelial fragments of the fungi that grow on damp building materials. There is experimental evidence that this exposure to triple-helical (1, 3)-β-D glucan and low molecular weight toxins may be associated with non-atopic asthma observed in damp and moldy buildings. However, the mechanisms underlying this response are only partially resolved. Using the pure (1, 3)-β-D glucan, curdlan, and the murine macrophage cell line, RAW 264.7, there were two objectives of this study. The first was to determine whether signal transduction pathways activating asthma-associated cell signaling pathways were stimulated using mouse transduction Pathway Finder(®) arrays and quantitative real-time (QRT) PCR. The second objective was to evaluate the dose and temporal responses associated with transcriptional changes in asthma-associated cytokines, the signal transduction receptor gene Dectin-1, and various transcription factor genes related to the induction of asthma using customized RT-PCR-based arrays. Compared to controls, the 10(-7) M curdlan treatment induced significant changes in gene transcription predominately in the NFkB, TGF-β, p53, JAK/STAT, P13/AKT, phospholipase C, and stress signaling pathways. The 10(-8) M curdlan treatment mainly induced NFkB and TGF-β pathways. Compared to controls, curdlan exposures also induced significant dose- and time-dependent changes in the gene translations. We found that that curdlan as a non-allergenic potentiator modulates a network of transduction signaling pathways not only associated with TH-1, TH-2, and TH-3 cell responses including asthma potentiation, but a variety of other cell responses in RAW 264.7 cells. These results help provide mechanistic basis for some of the phenotypic changes associated with asthma that have been observed in in vitro, in vivo, and human studies and open up a hypothesis-building process that could explain the rise of non-atopic asthma associated with fungi.
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Affiliation(s)
- Thomas G Rand
- Department of Biology, Saint Mary's University, 923 Robie St, Halifax, NS, B3H 3C3, Canada,
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27
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Jin W, Moats MS, Zheng S, Du H, Zhang Y, Miller JD. Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen Reduction Reaction. J Phys Chem B 2012; 116:7531-7. [DOI: 10.1021/jp303300y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Jin
- National Engineering Laboratory
for Hydrometallurgical Cleaner Production Technology, Institute of
Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
- Graduate School, Chinese Academy of Sciences, Beijing, 100049, People’s
Republic of China
| | - Michael S. Moats
- Department of Metallurgical
Engineering, University of Utah, Salt Lake
City, Utah 84112, United States
| | - Shili Zheng
- National Engineering Laboratory
for Hydrometallurgical Cleaner Production Technology, Institute of
Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Hao Du
- National Engineering Laboratory
for Hydrometallurgical Cleaner Production Technology, Institute of
Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Yi Zhang
- National Engineering Laboratory
for Hydrometallurgical Cleaner Production Technology, Institute of
Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Jan D. Miller
- Department of Metallurgical
Engineering, University of Utah, Salt Lake
City, Utah 84112, United States
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Miller JD, Skinner CN, Safford HD, Knapp EE, Ramirez CM. Trends and causes of severity, size, and number of fires in northwestern California, USA. Ecol Appl 2012; 22:184-203. [PMID: 22471083 DOI: 10.1890/10-2108.1] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Research in the last several years has indicated that fire size and frequency are on the rise in western U.S. forests. Although fire size and frequency are important, they do not necessarily scale with ecosystem effects of fire, as different ecosystems have different ecological and evolutionary relationships with fire. Our study assessed trends and patterns in fire size and frequency from 1910 to 2008 (all fires > 40 ha), and the percentage of high-severity in fires from 1987 to 2008 (all fires > 400 ha) on the four national forests of northwestern California. During 1910-2008, mean and maximum fire size and total annual area burned increased, but we found no temporal trend in the percentage of high-severity fire during 1987-2008. The time series of severity data was strongly influenced by four years with region-wide lightning events that burned huge areas at primarily low-moderate severity. Regional fire rotation reached a high of 974 years in 1984 and fell to 95 years by 2008. The percentage of high-severity fire in conifer-dominated forests was generally higher in areas dominated by smaller-diameter trees than in areas with larger-diameter trees. For Douglas-fir forests, the percentage of high-severity fire did not differ significantly between areas that re-burned and areas that only burned once (10% vs. 9%) when re-burned within 30 years. Percentage of high-severity fire decreased to 5% when intervals between first and second fires were > 30 years. In contrast, in both mixed-conifer and fir/high-elevation conifer forests, the percentage of high-severity fire was less when re-burned within 30 years compared to first-time burned (12% vs. 16% for mixed conifer; 11% vs. 19% for fir/high-elevation conifer). Additionally, the percentage of high-severity fire did not differ whether the re-burn interval was less than or greater than 30 years. Years with larger fires and greatest area burned were produced by region-wide lightning events, and characterized by less winter and spring precipitation than years dominated by smaller human-ignited fires. Overall percentage of high-severity fire was generally less in years characterized by these region-wide lightning events. Our results suggest that, under certain conditions, wildfires could be more extensively used to achieve ecological and management objectives in northwestern California.
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Affiliation(s)
- J D Miller
- USDA Forest Service, Pacific Southwest Region, Fire and Aviation Management, 3237 Peacekeeper Way, Suite 101, McClellan, California 95652, USA.
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Bohnsack JP, Assemi S, Miller JD, Furgeson DY. The primacy of physicochemical characterization of nanomaterials for reliable toxicity assessment: a review of the zebrafish nanotoxicology model. Methods Mol Biol 2012; 926:261-316. [PMID: 22975971 DOI: 10.1007/978-1-62703-002-1_19] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Engineered nanomaterials (ENMs) have become increasingly prevalent in the past two decades in academic, medical, commercial, and industrial settings. The unique properties imbued with nanoparticles, as the physiochemical properties change from the bulk material to the surface atoms, present unique and often challenging characteristics that larger macromolecules do not possess. While nanoparticle characteristics are indeed exciting for unique chemistries, surface properties, and diverse applications, reports of toxicity and environmental impacts have tempered this enthusiasm and given cause for an exponential increase for concomitant nanotoxicology assessment. Currently, nanotoxicology is a steadily growing with new literature and studies being published more frequently than ever before; however, the literature reveals clear, inconsistent trends in nanotoxicological assessment. At the heart of this issue are several key problems including the lack of validated testing protocols and models, further compounded by inadequate physicochemical characterization of the nanomaterials in question and the seminal feedback loop of chemistry to biology back to chemistry. Zebrafish (Danio rerio) are emerging as a strong nanotoxicity model of choice for ease of use, optical transparency, cost, and high degree of genomic homology to humans. This review attempts to amass all contemporary nanotoxicology studies done with the zebrafish and present as much relevant information on physicochemical characteristics as possible. While this report is primarily a physicochemical summary of nanotoxicity studies, we wish to strongly emphasize that for the proper evolution of nanotoxicology, there must be a strong marriage between the physical and biological sciences. More often than not, nanotoxicology studies are reported by groups dominated by one discipline or the other. Regardless of the starting point, nanotoxicology must be seen as an iterative process between chemistry and biology. It is our sincere hope that the future will introduce a paradigm shift in the approach to nanotoxicology with multidisciplinary groups for data analysis to produce predictive and correlative models for the end goal of rapid preclinical development of new therapeutics into the clinic or insertion into environmental protection.
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Affiliation(s)
- John P Bohnsack
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT, USA
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Magidson JF, Collado-Rodriguez A, Madan A, Perez-Camoirano NA, Galloway SK, Borckardt JJ, Campbell WK, Miller JD. Addressing narcissistic personality features in the context of medical care: integrating diverse perspectives to inform clinical practice. Personal Disord 2011; 3:196-208. [PMID: 22452761 DOI: 10.1037/a0025854] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Narcissistic personality disorder (NPD) is characterized by an unrealistic need for admiration, lack of empathy toward others, and feelings of superiority. NPD presents a unique and significant challenge in clinical practice, particularly in medical settings with limited provider contact time, as health professionals treat individuals who often require excessive admiration and have competing treatment needs. This practice review highlights real case examples across three distinct medically oriented clinical settings (inpatient and outpatient behavioral medicine and a Level I trauma center) to demonstrate the difficult and compromising situations that providers face when treating patients with general medical conditions and comorbid narcissistic personality features. The main goal of this article is to discuss the various challenges and obstacles associated with these cases in medical settings and discuss some strategies that may prove successful. A second goal is to bridge diverse conceptualizations of narcissism/NPD through the discussion of theoretical and empirical perspectives that can inform understanding of the clinical examples. Despite differing perspectives regarding the underlying motivation of narcissistic behavior, this practice review highlights that these paradigms can be integrated when sharing the same ultimate goal: to improve delivery of care across medically oriented clinical settings for patients with narcissistic features.
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Affiliation(s)
- J F Magidson
- Department of Psychology, University of Maryland College Park, 2103R Cole Field House, College Park, MD 20742, USA.
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Jin W, Moats MS, Zheng S, Du H, Zhang Y, Miller JD. Modulated Cr(III) oxidation in KOH solutions at a gold electrode: Competition between disproportionation and stepwise electron transfer. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.06.110] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Klindworth DL, Miller JD, Williams ND, Xu SS. Resistance to recombinant stem rust race TPPKC in hard red spring wheat. Theor Appl Genet 2011; 123:603-613. [PMID: 21573955 DOI: 10.1007/s00122-011-1610-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 04/26/2011] [Indexed: 05/30/2023]
Abstract
The wheat (Triticum aestivum L.) stem rust (Puccinia graminis Pers.:Pers. f.sp. tritici Eriks. and Henn.) resistance gene SrWld1 conditions resistance to all North American stem rust races and is an important gene in hard red spring (HRS) wheat cultivars. A sexually recombined race having virulence to SrWld1 was isolated in the 1980s. Our objective was to determine the genetics of resistance to the race. The recombinant race was tested with the set of stem rust differentials and with a set of 36 HRS and 6 durum cultivars. Chromosomal location studies in cultivars Len, Coteau, and Stoa were completed using aneuploid analysis, molecular markers, and allelism tests. Stem rust differential tests coded the race as TPPKC, indicating it differed from TPMKC by having added virulence on Sr30 as well as SrWld1. Genes effective against TPPKC were Sr6, Sr9a, Sr9b, Sr13, Sr24, Sr31, and Sr38. Genetic studies of resistance to TPPKC indicated that Len, Coteau, and Stoa likely carried Sr9b, that Coteau and Stoa carried Sr6, and Stoa carried Sr24. Tests of HRS and durum cultivars indicated that five HRS and one durum cultivar were susceptible to TPPKC. Susceptible HRS cultivars were postulated to have SrWld1 as their major stem rust resistance gene. Divide, the susceptible durum cultivar, was postulated to lack Sr13. We concluded that although TPPKC does not constitute a threat similar to TTKSK and its variants, some cultivars would be lost from production if TPPKC became established in the field.
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Affiliation(s)
- D L Klindworth
- USDA-ARS, Northern Crop Science Laboratory, Fargo, ND 58102-2765, USA.
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Qureshi YA, Huddy JR, Miller JD, Strauss DC, Thomas JM, Hayes AJ. Unplanned excision of soft tissue sarcoma results in increased rates of local recurrence despite full further oncological treatment. Ann Surg Oncol 2011; 19:871-7. [PMID: 21792512 DOI: 10.1245/s10434-011-1876-z] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Indexed: 11/18/2022]
Abstract
BACKGROUND Unplanned excision of soft tissue sarcoma (STS) accounts for up to 40% of all initial operations for STS and is undertaken when the mass is presumed to be benign. The effect this has on outcome has never been fully established. METHODS Patients with extremity or trunk STS between 2001 and 2005 who were treated by an initial inadvertent operation and then referred immediately to our unit were identified. Outcomes were compared with a control group of patients with STS who were stage-matched and had been treated conventionally by core biopsy and definitive surgery. Endpoints were local recurrence, distant metastases and sarcoma-specific survival. RESULTS 134 patients who had undergone unplanned excision of STS were identified. One hundred twenty-one underwent further re-excision, and 51 (48%) of these patients had residual tumour identified after surgical re-excision. Two hundred nine stage-matched controls were identified who were treated conventionally. Median follow-up was 51.6 months. Local recurrence rates were considerably higher in the study group (23.8 vs. 11%, p = 0.0016), despite the control group having more stage 3 tumours. When the tumours were matched by stage, an increase in local recurrence was seen across all stages but was most pronounced for stage 3 tumours (37.5 vs. 14.2%, p = 0.005). Metastasis-free and sarcoma-specific survival were also significantly increased for stage 3 tumours. CONCLUSION Unplanned initial excision of extremity soft tissue sarcoma may compromise long-term local control of extremity STS despite full further oncological management.
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Affiliation(s)
- Y A Qureshi
- Soft Tissue Sarcoma and Melanoma Unit, Department of Academic Surgery, The Royal Marsden Hospital, London, UK
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34
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Jernigan DB, Lindstrom SL, Johnson JR, Miller JD, Hoelscher M, Humes R, Shively R, Brammer L, Burke SA, Villanueva JM, Balish A, Uyeki T, Mustaquim D, Bishop A, Handsfield JH, Astles R, Xu X, Klimov AI, Cox NJ, Shaw MW. Detecting 2009 pandemic influenza A (H1N1) virus infection: availability of diagnostic testing led to rapid pandemic response. Clin Infect Dis 2011; 52 Suppl 1:S36-43. [PMID: 21342897 DOI: 10.1093/cid/ciq020] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Diagnostic tests for detecting emerging influenza virus strains with pandemic potential are critical for directing global influenza prevention and control activities. In 2008, the Centers for Disease Control and Prevention received US Food and Drug Administration approval for a highly sensitive influenza polymerase chain reaction (PCR) assay. Devices were deployed to public health laboratories in the United States and globally. Within 2 weeks of the first recognition of 2009 pandemic influenza H1N1, the Centers for Disease Control and Prevention developed and began distributing a new approved pandemic influenza H1N1 PCR assay, which used the previously deployed device platform to meet a >8-fold increase in specimen submissions. Rapid antigen tests were widely used by clinicians at the point of care; however, test sensitivity was low (40%-69%). Many clinical laboratories developed their own pandemic influenza H1N1 PCR assays to meet clinician demand. Future planning efforts should identify ways to improve availability of reliable testing to manage patient care and approaches for optimal use of molecular testing for detecting and controlling emerging influenza virus strains.
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Affiliation(s)
- D B Jernigan
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
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Rand TG, Dipenta J, Robbins C, Miller JD. Effects of low molecular weight fungal compounds on inflammatory gene transcription and expression in mouse alveolar macrophages. Chem Biol Interact 2011; 190:139-47. [PMID: 21356202 DOI: 10.1016/j.cbi.2011.02.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Revised: 02/13/2011] [Accepted: 02/14/2011] [Indexed: 12/01/2022]
Abstract
The inflammatory potential and molecular mechanisms underscoring inflammatory responses of lung cells to compounds from fungi that grow on damp building materials is poorly understood in vitro. In this study we evaluated the effect of pure fungal compounds on potentiating acute inflammatory response in primary mouse alveolar macrophages (AMs) and tested the hypothesis that AM responses to low molecular weight fungal compounds exhibit temporal and compound specificity that mimic that observed in the whole lung. Transcriptional responses of 13 inflammation/respiratory burst-associated genes (KC=Cxcl1, Cxcl2, Cxcl5, Cxcl10, Ccl3, Ccl112, Ccl20, IL-1β, Il-6, ifi27 Tnfα, iNOS and Blvrb) were evaluated in mouse AMs exposed to a 1ml (10(-8)mol) dose of either pure atranone C, brevianimide, cladosporin, curdlan, LPS, neoechinulin A & B, sterigmatocystin or TMC-120A for 2h, 4h and 12h PE using customized reverse transcription (RT)-PCR based arrays. Multianalyte ELISA was used to measure expression of 6 pro-inflammatory cytokines common to the transcriptional assays (Cxcl1, Cxcl10, Ccl3, IL1β, Ifn-λ and Tnf-α) to determine whether gene expression corresponded to the transcription data. Compared to controls, all of these compounds induced significant (≥2.5-fold or ≤-2.5-fold change at p≤0.05) time- and compound-specific transcriptional gene alterations in treatment AMs. The highest number of transcribed genes were in LPS treatment AMs at 12h PE (12/13) followed by neoechinulin B at 4h PE (11/13). Highest fold change values (>30) were associated with KC, Cxcl2, Cxcl5 and IL1β genes in cells exposed to LPS. Compound exposures also induced significant (p≤0.05) time- and compound-specific pro-inflammatory responses manifest as differentially elevated Cxcl1, Cxcl10, Ccl3, Ifn-λ and Tnf-α concentrations in culture supernatant of treatment AMs. Dissimilarity in transcriptional responses in AMs and our in vivo model of lung disease is likely attributable to whole lung vs. isolated cell responsive and dose differences between the two studies. The results not only indicate that low molecular weight compounds from fungi that grow in damp built environments are potently pro-inflammatory in vitro, it further highlights the important role AMs play in innate lung defence, and against exposure to low molecular weight fungal compounds. These observations further support our position that exposure to low molecular weight compounds from indoor-associated fungi may provoke some of the inflammatory health effects reported from humans in damp building environments. They also open up a hypothesis building process that could explain the rise of non-atopic asthma associated with fungi.
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Affiliation(s)
- Thomas G Rand
- Department of Biology, Saint Mary's University, Halifax, NS, Canada B3H 3C3
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Gupta V, Hampton MA, Nguyen AV, Miller JD. Crystal lattice imaging of the silica and alumina faces of kaolinite using atomic force microscopy. J Colloid Interface Sci 2010; 352:75-80. [DOI: 10.1016/j.jcis.2010.08.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 08/03/2010] [Accepted: 08/04/2010] [Indexed: 10/19/2022]
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Assemi S, Tadjiki S, Donose BC, Nguyen AV, Miller JD. Aggregation of fullerol C60(OH)24 nanoparticles as revealed using flow field-flow fractionation and atomic force microscopy. Langmuir 2010; 26:16063-16070. [PMID: 20849121 DOI: 10.1021/la102942b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The effects of solution pH and 1:1 electrolyte concentration on the aggregation behavior of fullerol C(60)(OH)(24) nanoparticles were investigated using flow field-flow fractionation (FlFFF). Particle separations were confirmed by examining FFF fractions using atomic force microscopy (AFM). Results showed that fullerol C(60)(OH)(24) nanoparticles remain stable at low salt concentration (0.001 M NaCl) and basic pH (pH 10). Changing the pH did not affect the size significantly, but increasing the salt concentration promoted some aggregation. Fullerol C(60)(OH)(24) nanoparticles did not form large clusters and reached a maximum size of at most several nanometers. Particle interaction analysis using the colloid interaction theory as described by the energetics of electrostatic repulsion and van der Waals attraction explained the differences in the colloidal stability of the fullerol C(60)(OH)(24) nanoparticles under different solution conditions.
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Affiliation(s)
- Shoeleh Assemi
- Department of Metallurgical Engineering, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, Utah 84112, USA.
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Abstract
Samples of leaves of red mangrove (Rhizophora mangle) were incubated on an agar medium selective for pythiaceous oomycetes. Leaves on trees above the water did not contain oomycetes. Marine oomycetes, principally Phytophthora vesicula, had colonized leaves within 2 h of leaf submergence, probably finding them by chemotaxis. The frequency of occurrence of P. vesicula in submerged leaves reached 100% within 30 h of submergence. By 43 h most, if not all, parts of leaves were occupied, and surface treatment with a biocide indicated that leaves were occupied internally. Frequencies of P. vesicula remained near 100% through about 2 weeks of submergence and then declined to about 60% in older (>/=4 weeks) leaves. Leaves of white mangrove (Laguncularia racemosa) were also extensively occupied by P. vesicula after falling into the water column, but decaying leaves of turtlegrass (Thalassia testudinum) were not colonized by oomycetes. Ergosterol analysis indicated that the standing crop of living, non-oomycete (ergosterol-containing) fungal mass in submerged red-mangrove leaves did not rise above that which had been present in senescent leaves on the tree; decaying turtlegrass leaves had an ergosterol content that was only about 2% of the maximum concentration detected for red-mangrove leaves. These results suggest that oomycetes are the predominant mycelial eucaryotic saprotrophs of mangrove leaves that fall into the water column and that for turtlegrass leaves which live, die, and decompose under submerged conditions, mycelial eucaryotes make no substantial contribution to decomposition.
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Affiliation(s)
- S Y Newell
- University of Georgia Marine Institute, Sapelo Island, Georgia 31327; Plant Research Centre, Research Branch, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6 ; and Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149
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Gupta V, Miller JD. Surface force measurements at the basal planes of ordered kaolinite particles. J Colloid Interface Sci 2010; 344:362-71. [DOI: 10.1016/j.jcis.2010.01.012] [Citation(s) in RCA: 208] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 01/03/2010] [Accepted: 01/07/2010] [Indexed: 11/24/2022]
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Wang X, Liu J, Du H, Miller JD. States of adsorbed dodecyl amine and water at a silica surface as revealed by vibrational spectroscopy. Langmuir 2010; 26:3407-3414. [PMID: 20025239 DOI: 10.1021/la9031943] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
States of adsorbed dodecylamine (DDA) at a silica surface have been studied as a function of pH by vibrational spectroscopy (SFVS, FTIR), contact angle measurements, and molecular dynamics (MD) simulations. The results show that the state of adsorbed DDA at a silica surface varies significantly at different pH values. At pH 6.30, there is no pronounced adsorption of DDA cations and the surface is hydrophilic. At pH 10.0, the vibrational spectroscopy results together with contact angle measurements and MD simulations suggest that amine is adsorbed as a well organized monolayer, the hemimicelle structure. Under these conditions, dehydration occurs based on SFVS analysis and the silica surface becomes hydrophobic. In the case of pH 12.3, it has been confirmed that continued adsorption of DDA neutral molecules occurs with the amine surface state changing from a monolayer to a bilayer or a micellar surface state as revealed both from SFVS analysis and MD simulations. At this high pH, extensive surface hydration is evident from SFVS results and the silica surface becomes hydrophilic.
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Affiliation(s)
- Xuming Wang
- Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City, Utah 84112, USA
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Hupka L, Nalaskowski J, Miller JD. Interaction forces for symmetric hydrophilic and hydrophobic systems in aqueous isopropanol solutions. Langmuir 2010; 26:2200-2208. [PMID: 20063871 DOI: 10.1021/la903906b] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Interaction force measurements were performed for a silica-silica hydrophilic system and for a silanated silica-silanated silica hydrophobic system using the atomic force microscopy colloidal probe technique. The influence of the solution composition on interaction forces was investigated. The hydrophilic silica-silica interactions were found to be described as a typical Derjaguin-Landau-Verwey-Overbeek (DLVO) system in solutions of various compositions, whereas silanated silica-silanated silica interactions were dominated by a long-range hydrophobic force. An increase in the isopropyl alcohol content of the solution diminishes both the repulsive forces in the case of the hydrophilic system and the attractive interactions in the case of the hydrophobic system.
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Affiliation(s)
- Lukasz Hupka
- Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT, USA.
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Miller JD, Sun M, Gilyan A, Roy J, Rand TG. Inflammation-associated gene transcription and expression in mouse lungs induced by low molecular weight compounds from fungi from the built environment. Chem Biol Interact 2010; 183:113-24. [PMID: 19818335 DOI: 10.1016/j.cbi.2009.09.023] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2009] [Revised: 09/29/2009] [Accepted: 09/29/2009] [Indexed: 12/27/2022]
Abstract
Few metabolites from fungi found indoors have been tested for inflammatory mediators endpoints in primary cultures of alveolar macrophages or in vivo. In this study, mice were intratracheally instilled with a single dose comprising 4x10(-5)moletoxin/kg lung wt dose of either atranone C, brevianamide, cladosporin, mycophenolic acid, neoechinulin A & B, sterigmatocystin or TMC-120A. These toxins are from fungi common on damp building materials. The dose used was comparable to the estimated doses of possible human exposure. Hematoxylin and eosin (H&E) histology and Alcian Blue/Periodic Acid Schiff (AB/PAS) histochemistry were used to evaluate lungs for time course (4h and 12h post-exposure (PE)) inflammatory and toxic changes. Reverse-transcription (RT)-PCR based arrays were also employed to evaluate time course inflammation-associated gene transcription in lung tissues of the different toxins. Immunohistochemistry (IHC) was used to probe MIP-2 and Tnf-alpha protein expression in treatment lungs to determine whether responses correspond with gene transcription data. Both histology and histochemistry revealed that toxin exposed lungs at 12h PE showed evidence of inflammation. H&E revealed that bronchioli were lined with irregularly thickened and sometimes sloughing epithelium and bronchiolar spaces supported infiltration of leukocytes, cellular and mucus-like debris while alveolar spaces supported swollen macrophages and modest amorphous debris accumulations. All toxin-instilled lungs exhibited copious mucus production and alveolar macrophages with red stained cytoplasm on bronchiolar surfaces, especially at 12h PE. Array analysis of 83 inflammation-associated genes extracted from lung tissue demonstrated a number of patterns, compared to controls. 82 genes assayed at 4h PE and 75 genes at 12h PE were significantly altered (p< or =0.05; >or =1.5-fold or < or =-1.5-fold change) in the different treatment animal groups. Expression of transcriptionally regulated genes was confirmed using immunohistochemistry that demonstrated MIP-2 and Tnf-alpha staining in respiratory bronchiolar epithelia, alveolar macrophages and alveolar type II cells. The transcriptional regulation in these genes in the treatment groups suggests that they may serve central roles in the immunomodulation of toxin-induced pro-inflammatory lung responses. Hierarchical cluster analysis revealed significant patterns of gene transcription linking the response of the toxins at equimolar doses in three groups: (1) brevianamide, mycophenolic acid and neoechinulin B, (2) neoechinulin A and sterigmatocystin, and (3) cladosporin, atranone C and TMC-120. The results further confirm the inflammatory nature of metabolites/toxins from such fungi can contribute to the development of non-allergenic respiratory health effects.
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Affiliation(s)
- J D Miller
- Department of Chemistry, Carleton University, Ottawa, Ontario, Canada K1S 5B6
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Kovesi T, Zaloum C, Stocco C, Fugler D, Dales RE, Ni A, Barrowman N, Gilbert NL, Miller JD. Heat recovery ventilators prevent respiratory disorders in Inuit children. Indoor Air 2009; 19:489-499. [PMID: 19719534 DOI: 10.1111/j.1600-0668.2009.00615.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
UNLABELLED Inuit infants have high rates of reported hospitalization for respiratory infection, associated with overcrowding and reduced ventilation. We performed a randomized, double-blind, placebo controlled trial to determine whether home heat recovery ventilators (HRV) would improve ventilation and reduce the risk of respiratory illnesses in young Inuit children. Inuit children under 6 years of age living in several communities in Nunavut, Canada were randomized to receive an active or placebo HRV. We monitored respiratory symptoms, health center encounters, and indoor air quality for 6 months. HRVs were placed in 68 homes, and 51 houses could be analyzed. Subjects had a mean age of 26.8 months. Active HRVs brought indoor carbon dioxide concentrations to within recommended concentrations. Relative humidity was also reduced. Use of HRV, compared with placebo, was associated with a progressive fall in the odds ratio for reported wheeze of 12.3% per week (95%CI 1.9-21.6%, P = 0.022). Rates of reported rhinitis were significantly lower in the HRV group than the placebo group in month 1 (odds ratio 0.20, 95%CI 0.058-0.69, P = 0.011) and in month 4 (odds ratio 0.24, 95%CI 0.054-0.90, P = 0.035). There were no significant reductions in the number of health center encounters, and there were no hospitalizations. Use of HRVs was associated with in improvement in air quality and reductions in reported respiratory symptoms in Inuit children. PRACTICAL IMPLICATIONS Reduced ventilation is common in the houses of Inuit children in arctic Canada, and is associated with an increased risk of respiratory infection. Installation of HRV brings indoor carbon dioxide concentration, as a marker of adequate ventilation, to within recommended concentrations, although relative humidity is also reduced. Installation of HRV is associated with improvements in indoor air quality, and a reduced risk of wheezing and rhinitis not associated with cold air exposure in young Inuit children. Further research is required to explore traditional Inuit cultural attitudes about air movement in dwellings.
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Affiliation(s)
- T Kovesi
- Department of Paediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada.
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Miller JD, Sal MS, Schell M, Whittimore JD, Raulston JE. Chlamydia trachomatis YtgA is an iron-binding periplasmic protein induced by iron restriction. Microbiology (Reading) 2009; 155:2884-2894. [PMID: 19556290 DOI: 10.1099/mic.0.030247-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Chlamydia trachomatis is a Gram-negative obligate intracellular bacterium that is the causative agent of common sexually transmitted diseases and the leading cause of preventable blindness worldwide. It has been observed that YtgA (CT067) is very immunogenic in patients with chlamydial genital infections. Homology analyses suggested that YtgA is a soluble periplasmic protein and a component of an ATP-binding cassette (ABC) transport system for metals such as iron. Since little is known about iron transport in C. trachomatis, biochemical assays were used to determine the potential role of YtgA in iron acquisition. (59)Fe binding and competition studies revealed that YtgA preferentially binds iron over nickel, zinc or manganese. Western blot and densitometry techniques showed that YtgA concentrations specifically increased 3-5-fold in C. trachomatis, when cultured under iron-starvation conditions rather than under general stress conditions, such as exposure to penicillin. Finally, immuno-transmission electron microscopy provided evidence that YtgA is more concentrated in C. trachomatis during iron restriction, supporting a possible role for YtgA as a component of an ABC transporter.
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Affiliation(s)
- J D Miller
- Dept of Molecular Biomedical Sciences, School of Veterinary Medicine, N.C. State University, Raleigh, NC 27606, USA
| | - M S Sal
- Dept of Microbiology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 3761, USA
| | - M Schell
- Dept of Microbiology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 3761, USA
| | - J D Whittimore
- Dept of Microbiology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 3761, USA
| | - J E Raulston
- Dept of Pathology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 3761, USA.,Dept of Microbiology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 3761, USA
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Deering CE, Tadjiki S, Assemi S, Miller JD, Yost GS, Veranth JM. A novel method to detect unlabeled inorganic nanoparticles and submicron particles in tissue by sedimentation field-flow fractionation. Part Fibre Toxicol 2008; 5:18. [PMID: 19055780 PMCID: PMC2613373 DOI: 10.1186/1743-8977-5-18] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Accepted: 12/03/2008] [Indexed: 02/24/2023] Open
Abstract
A novel methodology to detect unlabeled inorganic nanoparticles was experimentally demonstrated using a mixture of nano-sized (70 nm) and submicron (250 nm) silicon dioxide particles added to mammalian tissue. The size and concentration of environmentally relevant inorganic particles in a tissue sample can be determined by a procedure consisting of matrix digestion, particle recovery by centrifugation, size separation by sedimentation field-flow fractionation (SdFFF), and detection by light scattering.
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Affiliation(s)
- Cassandra E Deering
- Department of Pharmacology & Toxicology, University of Utah, 30 South 2000 East, Salt Lake City, Utah, USA.
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Naik SP, Du H, Wan H, Bui V, Miller JD, Zmierczak WW. A Comparative Study of ZnO−CuO−Al2O3/SiO2−Al2O3 Composite and Hybrid Catalysts for Direct Synthesis of Dimethyl Ether from Syngas. Ind Eng Chem Res 2008. [DOI: 10.1021/ie801437c] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sajo P. Naik
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
| | - Hao Du
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
| | - Haijun Wan
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
| | - Vy Bui
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
| | - Jan D. Miller
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
| | - Wlodzimierz W. Zmierczak
- Department of Metallurgical Engineering, the University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112-0114
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Wang X, Liu J, Miller JD. Adsorption and self-assembly of octyl hydroxamic acid at a fluorite surface as revealed by sum-frequency vibrational spectroscopy. J Colloid Interface Sci 2008; 325:398-403. [DOI: 10.1016/j.jcis.2008.05.064] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Revised: 05/24/2008] [Accepted: 05/30/2008] [Indexed: 10/22/2022]
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Lelinski D, Drelich J, Miller JD, Hupka J. Rate of Bitumen Film Transfer from a Quartz Surface to an Air Bubble as Observed by Optical Microscopy. CAN J CHEM ENG 2008. [DOI: 10.1002/cjce.5450820418] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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