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Wetz MS, Powers NC, Turner JW, Huang Y. No widespread signature of the COVID-19 quarantine period on water quality across a spectrum of coastal systems in the United States of America. Sci Total Environ 2022; 807:150825. [PMID: 34627882 PMCID: PMC9751947 DOI: 10.1016/j.scitotenv.2021.150825] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 10/01/2021] [Accepted: 10/02/2021] [Indexed: 06/13/2023]
Abstract
During the recent COVID-19 related quarantine period, anecdotal evidence emerged pointing to a rapid, sharp improvement in water quality in some localities. Here we present results from an analysis of the impacts of the COVID-19 quarantine period using two long-term coastal water quality datasets. These datasets rely on sampling that operates at appropriate timescales to quantify the influence of reduced human activity on coastal water quality and span coastal ecosystems ranging from low human influence to highly urbanized systems. We tested two hypotheses: 1) reduced tourism during the COVID-19 quarantine period would lead to improved coastal water quality, and 2) water quality improvements would scale to the level of human influence, meaning that highly urbanized or tourist-centric watersheds would see greater improvement than more rural watersheds. A localized reduction in fecal indicator bacteria was observed in four highly impacted regions of the Texas (USA) coast, but this pattern was not widespread. In less impacted regions, the signature of natural, decadal environmental variability (e.g., dissolved oxygen and turbidity) overwhelmed any potential signature of reduced human activity. Results from this study add to the growing body of literature on the environmental impacts of the COVID-19 quarantine period, and when considered with existing literature, emphasize that coastal water quality improvements appear to be ephemeral and reserved for the most severely affected (by human activity) systems. Furthermore, results show the importance of assessing COVID-19 signatures against long-term, decadal datasets that adequately reveal a system's natural variation.
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Affiliation(s)
- Michael S Wetz
- Department of Life Sciences, Texas A&M University-Corpus Christi, TX 78412, USA; Harte Research Institute for Gulf of Mexico Studies, Texas A&M University-Corpus Christi, TX 78412, USA.
| | - Nicole C Powers
- Department of Life Sciences, Texas A&M University-Corpus Christi, TX 78412, USA
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, TX 78412, USA
| | - Yuxia Huang
- School of Engineering and Computing Sciences, Texas A&M University-Corpus Christi, TX 78412, USA
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2
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Di Cesare A, Pinnell LJ, Brambilla D, Elli G, Sabatino R, Sathicq MB, Corno G, O'Donnell C, Turner JW. Bioplastic accumulates antibiotic and metal resistance genes in coastal marine sediments. Environ Pollut 2021; 291:118161. [PMID: 34537596 DOI: 10.1016/j.envpol.2021.118161] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 06/25/2021] [Revised: 09/01/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
The oceans are increasingly polluted with plastic debris, and several studies have implicated plastic as a reservoir for antibiotic resistance genes and a potential vector for antibiotic-resistant bacteria. Bioplastic is widely regarded as an environmentally friendly replacement to conventional petroleum-based plastic, but the effects of bioplastic pollution on marine environments remain largely unknown. Here, we present the first evidence that bioplastic accumulates antibiotic resistance genes (ARGs) and metal resistance genes (MRGs) in marine sediments. Biofilms fouling ceramic, polyethylene terephthalate (PET), and polyhydroxyalkanoate (PHA) were investigated by shotgun metagenomic sequencing. Four ARG groups were more abundant in PHA: trimethoprim resistance (TMP), multidrug resistance (MDR), macrolide-lincosamide-streptogramin resistance (MLS), and polymyxin resistance (PMR). One MRG group was more abundant in PHA: multimetal resistance (MMR). The relative abundance of ARGs and MRGs were strongly correlated based on a Mantel test between the Bray-Curtis dissimilarity matrices (R = 0.97, p < 0.05) and a Pearson's analysis (R = 0.96, p < 0.05). ARGs were detected in more than 40% of the 57 metagenome-assembled genomes (MAGs) while MRGs were detected in more than 90% of the MAGs. Further investigation (e.g., culturing, genome sequencing, antibiotic susceptibility testing) revealed that PHA biofilms were colonized by hemolytic Bacillus cereus group bacteria that were resistant to beta-lactams, vancomycin, and bacitracin. Taken together, our findings indicate that bioplastic, like conventional petroleum-based plastic, is a reservoir for resistance genes and a potential vector for antibiotic-resistant bacteria in coastal marine sediments.
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Affiliation(s)
- Andrea Di Cesare
- Water Research Institute, National Research Council of Italy (CNR-IRSA), MEG - Molecular Ecology Group, Largo Tonolli 50, 28922, Verbania, Italy
| | - Lee J Pinnell
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, 78412, United States
| | - Diego Brambilla
- Water Research Institute, National Research Council of Italy (CNR-IRSA), MEG - Molecular Ecology Group, Largo Tonolli 50, 28922, Verbania, Italy
| | - Giulia Elli
- Division of Biotechnology, Department of Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-22100, Lund, Sweden
| | - Raffaella Sabatino
- Water Research Institute, National Research Council of Italy (CNR-IRSA), MEG - Molecular Ecology Group, Largo Tonolli 50, 28922, Verbania, Italy
| | - María B Sathicq
- Water Research Institute, National Research Council of Italy (CNR-IRSA), MEG - Molecular Ecology Group, Largo Tonolli 50, 28922, Verbania, Italy
| | - Gianluca Corno
- Water Research Institute, National Research Council of Italy (CNR-IRSA), MEG - Molecular Ecology Group, Largo Tonolli 50, 28922, Verbania, Italy
| | - Colin O'Donnell
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, 78412, United States
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, 78412, United States.
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3
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DiBona E, Pinnell LJ, Heising-Huang A, Geist S, Turner JW, Seemann F. A Holistic Assessment of Polyethylene Fiber Ingestion in Larval and Juvenile Japanese Medaka Fish. Front Physiol 2021; 12:668645. [PMID: 34421633 PMCID: PMC8371532 DOI: 10.3389/fphys.2021.668645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/13/2021] [Indexed: 12/12/2022] Open
Abstract
Microplastic pollution is of public concern for global environmental health, aquaculture, and fisheries. Toxicity studies have shown that microplastic ingestion may cause intestinal damage, microbiota dysbiosis, and disturb the lipid and energy metabolism in fish. To determine the impact of environmentally relevant, chronic, low dose microplastic fibers on fish health, medaka larvae, and juveniles were exposed to five concentrations of polyethylene (PE) fibers for 21 days through the feed. Fish growth and condition were assessed to determine the overall impact on fish health. To identify impaired energy intake, the gastrointestinal tract (GIT) integrity was evaluated at the molecular and cellular levels. Microbiota analysis was performed by comparing the top seven most abundant phyla present in both larval and juvenile fish exposed to 0, 1.5, and 3 PE fibers/fish/day. A shift in the phyla Proteobacteria and Bacteroidetes were observed. Larval samples demonstrated decreased proteobacteria abundance, while juvenile samples displayed an increase in abundance. Relative gene expression of key digestive genes from GIT tissue was quantified using real time-quantitative polymerase chain reaction. An effect on digestive gene expression potentially affecting nutrient absorption and antioxidant production was indicated via a significant decrease of solute carrier family 6 member 6 expression in larvae exposed to 6 fibers/fish/day. No significant molecular changes were observed in juvenile GIT tissue, although a non-monotonous dose-response was observed. GIT morphology was analyzed using histomorphological observations of the GIT mucus and cell types. No significant impairment of the GIT epithelial layers was observed in larvae or juveniles. To assess growth and condition, Fulton's condition factor was measured. No differences were observed in larval or juvenile growth. Comparisons of different developmental stages allowed for identifying vulnerable developmental stages for microplastic exposure; larvae were more susceptible to molecular changes, while shifts in juvenile microbial communities were similar to changes reported post-polystyrene microplastic sphere exposure. This study is one of the first to provide toxicological data on the risk of PE fiber ingestion during fish development stages. Results indicate no imminent threat to fish condition at current measured environmental levels of microplastics; however, close monitoring of vital spawning grounds for commercially important fishes is recommended.
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Affiliation(s)
- Elizabeth DiBona
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Lee J Pinnell
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Annika Heising-Huang
- Institut für Genetik, Technische Universität Braunschweig, Braunschweig, Germany
| | - Simon Geist
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States.,Center for Coastal and Marine Studies, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Frauke Seemann
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States.,Center for Coastal and Marine Studies, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
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Powers NC, Pinchback J, Flores L, Huang Y, Wetz MS, Turner JW. Long-term water quality analysis reveals correlation between bacterial pollution and sea level rise in the northwestern Gulf of Mexico. Mar Pollut Bull 2021; 166:112231. [PMID: 33798816 DOI: 10.1016/j.marpolbul.2021.112231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 12/07/2020] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Long-term assessments are needed to identify water quality trends and their socio-environmental drivers for coastal management and watershed restoration. This study provides the first long-term assessment of fecal bacterial pollution in the northwestern Gulf of Mexico using enterococci data spanning the Texas coast from 2009 to 2020. The data were representative of 66 beaches, 169 stations, and over 75,000 samples. Findings demonstrate that 22 beaches are 'hotspots' of pollution and experienced enterococci levels that frequently exceeded the USEPA beach action value. Further, enterococci were correlated with time, population size, and sea level. Weak correlations detected in some counties highlight the multifactorial nature of water quality; additional factors are likely influencing enterococci levels. The correlation with sea level is concerning, as counties vulnerable to sea level rise frequently reported enterococci concentrations exceeding the beach action value. In consideration of sea level rise predictions, targeted studies are needed to pinpoint drivers of fecal pollution.
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Affiliation(s)
- Nicole C Powers
- Department of Life Sciences, Texas A&M University-Corpus Christi, TX 78412, USA
| | | | - Lucy Flores
- Texas General Land Office, Austin, TX 78701, USA
| | - Yuxia Huang
- School of Engineering and Computing Sciences, Texas A&M University-Corpus Christi, TX 78412, USA
| | - Michael S Wetz
- Harte Research Institute, Texas A&M University-Corpus Christi, TX 78412, USA
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, TX 78412, USA.
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5
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Pinnell LJ, Turner JW. Temporal changes in water temperature and salinity drive the formation of a reversible plastic-specific microbial community. FEMS Microbiol Ecol 2021; 96:5979776. [PMID: 33181829 DOI: 10.1093/femsec/fiaa230] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 07/01/2020] [Accepted: 11/10/2020] [Indexed: 01/04/2023] Open
Abstract
Plastic is a ubiquitous pollutant in the marine environment. Here, we investigated how temporal changes in environmental factors affect the microbial communities formed on plastic (polyethylene terephthalate; PET) versus a ceramic substrate. In situ mesocosms (N = 90 replicates) were deployed at the sediment-water interface of a coastal lagoon and sampled every 4 weeks for 424 days. Sequencing data (16S rRNA) was parsed based on variation in temperature with the exposure starting in fall 2016 and remaining in situ through the next four seasons (winter, spring, summer and fall 2017). PET biofilms were distinct during the summer when salinity and temperature were highest. In particular, a significant shift in the relative abundance of Ignavibacteriales and Cytophagales was observed during the summer, but PET and ceramic communities were again indistinguishable the following fall. Water temperature, salinity and pH were significant drivers of PET biofilm diversity as well as the relative abundance of plastic-discriminant taxa. This study illustrates the temporal and successional dynamics of PET biofilms and clearly demonstrates that increased water temperature, salinity, pH and exposure length play a role in the formation of a plastic-specific microbial community, but this specificity can be lost with a change in environmental conditions.
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Affiliation(s)
- Lee J Pinnell
- Department of Life Sciences, Texas A&M University - Corpus Christi, 3600 Ocean Drive, Corpus Christi, Texas, 78412, USA
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University - Corpus Christi, 3600 Ocean Drive, Corpus Christi, Texas, 78412, USA
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Huang IS, Pinnell LJ, Turner JW, Abdulla H, Boyd L, Linton EW, Zimba PV. Preliminary Assessment of Microbial Community Structure of Wind-Tidal Flats in the Laguna Madre, Texas, USA. Biology (Basel) 2020; 9:E183. [PMID: 32707990 PMCID: PMC7464120 DOI: 10.3390/biology9080183] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/15/2020] [Accepted: 07/18/2020] [Indexed: 12/12/2022]
Abstract
Aside from two samples collected nearly 50 years ago, little is known about the microbial composition of wind tidal flats in the hypersaline Laguna Madre, Texas. These mats account for ~42% of the lagoon's area. These microbial communities were sampled at four locations that historically had mats in the Laguna Madre, including Laguna Madre Field Station (LMFS), Nighthawk Bay (NH), and two locations in Kenedy Ranch (KRN and KRS). Amplicon sequencing of 16S genes determined the presence of 51 prokaryotic phyla dominated by Bacteroidota, Chloroflexi, Cyanobacteria, Desulfobacteria, Firmicutes, Halobacteria, and Proteobacteria. The microbial community structure of NH and KR is significantly different to LMFS, in which Bacteroidota and Proteobacteria were most abundant. Twenty-three cyanobacterial taxa were identified via genomic analysis, whereas 45 cyanobacterial taxa were identified using morphological analysis, containing large filamentous forms on the surface, and smaller, motile filamentous and coccoid forms in subsurface mat layers. Sample sites were dominated by species in Oscillatoriaceae (i.e., Lyngbya) and Coleofasciculaceae (i.e., Coleofasciculus). Most cyanobacterial sequences (~35%) could not be assigned to any established taxa at the family/genus level, given the limited knowledge of hypersaline cyanobacteria. A total of 73 cyanobacterial bioactive metabolites were identified using ultra performance liquid chromatography-Orbitrap MS analysis from these commu nities. Laguna Madre seems unique compared to other sabkhas in terms of its microbiology.
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Affiliation(s)
- I.-Shuo Huang
- Center for Coastal Studies, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA;
- Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA 23062, USA
| | - Lee J. Pinnell
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA; (L.J.P.); (J.W.T.)
- A. Watson Armour III Center for Animal Health and Welfare, John G. Shedd Aquarium, Chicago, IL 60605, USA
| | - Jeffrey W. Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA; (L.J.P.); (J.W.T.)
| | - Hussain Abdulla
- Department of Physical and Environmental Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA;
| | - Lauren Boyd
- Department of Biology, Central Michigan University, Mount Pleasant, MI 48859, USA; (L.B.); (E.W.L.)
| | - Eric W. Linton
- Department of Biology, Central Michigan University, Mount Pleasant, MI 48859, USA; (L.B.); (E.W.L.)
| | - Paul V. Zimba
- Center for Coastal Studies, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA;
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Nasr Azadani D, Zhang D, Hatherill JR, Silva D, Turner JW. Isolation, characterization, and comparative genomic analysis of a phage infecting high-level aminoglycoside-resistant (HLAR) Enterococcus faecalis. PeerJ 2020; 8:e9171. [PMID: 32509458 PMCID: PMC7246028 DOI: 10.7717/peerj.9171] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 04/20/2020] [Indexed: 11/20/2022] Open
Abstract
Enterococcus is a genus of Gram-positive bacteria that are commensal to the gastrointestinal tracts of humans but some species have been increasingly implicated as agents of nosocomial infections. The increase in infections and the spread of antibiotic-resistant strains have contributed to renewed interest in the discovery of Enterococcus phages. The aims of this study were (1) the isolation, characterization, and genome sequencing of a phage capable of infecting an antibiotic-resistant E. faecalis strain, and (2) the comparative genomic analysis of publicly-available Enterococcus phages. For this purpose, multiple phages were isolated from wastewater treatment plant (WWTP) influent using a high-level aminoglycoside-resistant (HLAR) E. faecalis strain as the host. One phage, phiNASRA1, demonstrated a high lytic efficiency (∼97.52%). Transmission electron microscopy (TEM) and whole-genome sequencing (WGS) showed that phiNASRA1 belongs to the Siphoviridae family of double-stranded DNA viruses. The phage was approximately 250 nm in length and its complete genome (40,139 bp, 34.7% GC) contained 62 open reading frames (ORFs). Phylogenetic comparisons of phiNASRA1 and 31 publicly-available Enterococcus phages, based on the large subunit terminase and portal proteins, grouped phage by provenance, size, and GC content. In particular, both phylogenies grouped phages larger than 100 kbp into distinct clades. A phylogeny based on a pangenome analysis of the same 32 phages also grouped phages by provenance, size, and GC content although agreement between the two single-locus phylogenies was higher. Per the pangenome phylogeny, phiNASRA1 was most closely related to phage LY0322 that was similar in size, GC content, and number of ORFs (40,139 and 40,934 bp, 34.77 and 34.80%, and 60 and 64 ORFs, respectively). The pangenome analysis did illustrate the high degree of sequence diversity and genome plasticity as no coding sequence was homologous across all 32 phages, and even 'conserved' structural proteins (e.g., the large subunit terminase and portal proteins) were homologous in no more than half of the 32 phage genomes. These findings contribute to a growing body of literature devoted to understanding phage biology and diversity. We propose that this high degree of diversity limited the value of the single-locus and pangenome phylogenies. By contrast, the high degree of homology between phages larger than 100 kbp suggests that pangenome analyses of more similar phages is a viable method for assessing subclade diversity. Future work is focused on validating phiNASRA1 as a potential therapeutic agent to eradicate antibiotic-resistant E. faecalis infections in an animal model.
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Affiliation(s)
- Danial Nasr Azadani
- Life Sciences, Texas A&M University—Corpus Christi, Corpus Christi, TX, United States of America
| | - Daiyuan Zhang
- Natural Sciences, Del Mar College, Corpus Christi, TX, United States of America
| | - J. Robert Hatherill
- Natural Sciences, Del Mar College, Corpus Christi, TX, United States of America
| | - David Silva
- Life Sciences, Texas A&M University—Corpus Christi, Corpus Christi, TX, United States of America
| | - Jeffrey W. Turner
- Life Sciences, Texas A&M University—Corpus Christi, Corpus Christi, TX, United States of America
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Mullis MM, Huang IS, Planas-Costas GM, Pray R, Buck GW, Nassiri A, Fuentes C, Turner L, Ramirez GD, Mott JB, Turner JW. Draft Genome Sequences of 42 Environmental Vibrio vulnificus Strains Isolated from the Northern Gulf of Mexico. Microbiol Resour Announc 2019; 8:e00200-19. [PMID: 31296669 PMCID: PMC6624752 DOI: 10.1128/mra.00200-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/17/2019] [Indexed: 01/22/2023] Open
Abstract
Vibrio vulnificus is a Gram-negative bacterium and an opportunistic pathogen that can cause septicemia or necrotizing fasciitis. Here, we report the draft genome sequences of 42 environmental V. vulnificus strains collected from the northern Gulf of Mexico. These data will allow for more robust comparisons between clinical and environmental strains.
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Affiliation(s)
- Megan M Mullis
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
| | - I-Shuo Huang
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
| | | | - Reavelyn Pray
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
| | - Gregory W Buck
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
| | - Arian Nassiri
- Virginia Division of Consolidated Laboratory Services, Department of General Services, Richmond, Virginia, USA
| | - Courtney Fuentes
- Virginia Division of Consolidated Laboratory Services, Department of General Services, Richmond, Virginia, USA
| | - Lauren Turner
- Virginia Division of Consolidated Laboratory Services, Department of General Services, Richmond, Virginia, USA
| | - Gabriel D Ramirez
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
| | - Joanna B Mott
- College of Natural Sciences and Mathematics, California State University, Sacramento, California, USA
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA
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9
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Pinnell LJ, Turner JW. Shotgun Metagenomics Reveals the Benthic Microbial Community Response to Plastic and Bioplastic in a Coastal Marine Environment. Front Microbiol 2019; 10:1252. [PMID: 31231339 PMCID: PMC6566015 DOI: 10.3389/fmicb.2019.01252] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 05/20/2019] [Indexed: 11/23/2022] Open
Abstract
Plastic is incredibly abundant in marine environments but little is known about its effects on benthic microbiota and biogeochemical cycling. This study reports the shotgun metagenomic sequencing of biofilms fouling plastic and bioplastic microcosms staged at the sediment–water interface of a coastal lagoon. Community composition analysis revealed that plastic biofilms were indistinguishable in comparison to a ceramic biofilm control. By contrast, bioplastic biofilms were distinct and dominated by sulfate-reducing microorganisms (SRM). Analysis of bioplastic gene pools revealed the enrichment of esterases, depolymerases, adenylyl sulfate reductases (aprBA), and dissimilatory sulfite reductases (dsrAB). The nearly 20-fold enrichment of a phylogenetically diverse polyhydroxybutyrate (PHB) depolymerase suggests this gene was distributed across a mixed microbial assemblage. The metagenomic reconstruction of genomes identified novel species of Desulfovibrio, Desulfobacteraceae, and Desulfobulbaceae among the abundant SRM, and these genomes contained genes integral to both bioplastic degradation and sulfate reduction. Findings indicate that bioplastic promoted a rapid and significant shift in benthic microbial diversity and gene pools, selecting for microbes that participate in bioplastic degradation and sulfate reduction. If plastic pollution is traded for bioplastic pollution and sedimentary inputs are large, the microbial response could unintentionally affect benthic biogeochemical activities through the stimulation of sulfate reducers.
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Affiliation(s)
- Lee J Pinnell
- Department of Life Sciences, Texas A&M University - Corpus Christi, Corpus Christi, TX, United States
| | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University - Corpus Christi, Corpus Christi, TX, United States
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10
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Turner JW, Tallman JJ, Macias A, Pinnell LJ, Elledge NC, Nasr Azadani D, Nilsson WB, Paranjpye RN, Armbrust EV, Strom MS. Comparative Genomic Analysis of Vibrio diabolicus and Six Taxonomic Synonyms: A First Look at the Distribution and Diversity of the Expanded Species. Front Microbiol 2018; 9:1893. [PMID: 30158916 PMCID: PMC6104160 DOI: 10.3389/fmicb.2018.01893] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/27/2018] [Indexed: 11/13/2022] Open
Abstract
Vibrio is a diverse genus of Gammaproteobacteria autochthonous to marine environments worldwide. Vibrio diabolicus and V. antiquarius were originally isolated from deep-sea hydrothermal fields in the East Pacific Rise. These species are closely related to members of the Harveyi clade (e.g., V. alginolyticus and V. parahaemolyticus) that are commonly isolated from coastal systems. This study reports the discovery and draft genome sequence of a novel isolate (Vibrio sp. 939) cultured from Pacific oysters (Crassostrea gigas). Questions surrounding the identity of Vibrio sp. 939 motivated a genome-scale taxonomic analysis of the Harveyi clade. A 49-genome phylogeny based on 1,109 conserved coding sequences and a comparison of average nucleotide identity (ANI) values revealed a clear case of synonymy between Vibrio sp. 939, V. diabolicus Art-Gut C1 and CNCM I-1629, V. antiquarius EX25 and four V. alginolyticus strains (E0666, FF273, TS13, and V2). This discovery expands the V. diabolicus species and makes available six additional genomes for comparative genomic analyses. The distribution of the expanded species is thought to be global given the range of isolation sources (horse mackerel, seawater, sediment, dentex, oyster, artemia and polycheate) and origins (China, India, Greece, United States, East Pacific Rise, and Chile). A subsequent comparative genomic analysis of this new eight-genome subclade revealed a high degree of individual genome plasticity and a large repertoire of genes related to virulence and defense. These findings represent a significant revision to the understanding of V. diabolicus and V. antiquarius as both have long been regarded as distinct species. This first look at the expanded V. diabolicus subclade suggests that the distribution and diversity of this species mirrors that of other Harveyi clade species, which are notable for their ubiquity and diversity.
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Affiliation(s)
- Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - James J Tallman
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Amanda Macias
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Lee J Pinnell
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Nicole C Elledge
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - Danial Nasr Azadani
- Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX, United States
| | - William B Nilsson
- Division of Environmental and Fisheries Sciences, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, United States
| | - Rohinee N Paranjpye
- Division of Environmental and Fisheries Sciences, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, United States
| | - E V Armbrust
- Center for Environmental Genomics, School of Oceanography, University of Washington, Seattle, WA, United States
| | - Mark S Strom
- Division of Environmental and Fisheries Sciences, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, United States
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Conkle JL, Báez Del Valle CD, Turner JW. Are We Underestimating Microplastic Contamination in Aquatic Environments? Environ Manage 2018; 61:1-8. [PMID: 29043380 DOI: 10.1007/s00267-017-0947-8] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [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: 07/08/2017] [Accepted: 09/26/2017] [Indexed: 05/06/2023]
Abstract
Plastic debris, specifically microplastic in the aquatic environment, is an escalating environmental crisis. Efforts at national scales to reduce or ban microplastics in personal care products are starting to pay off, but this will not affect those materials already in the environment or those that result from unregulated products and materials. To better inform future microplastic research and mitigation efforts this study (1) evaluates methods currently used to quantify microplastics in the environment and (2) characterizes the concentration and size distribution of microplastics in a variety of products. In this study, 50 published aquatic surveys were reviewed and they demonstrated that most (~80%) only account for plastics ≥ 300 μm in diameter. In addition, we surveyed 770 personal care products to determine the occurrence, concentration and size distribution of polyethylene microbeads. Particle concentrations ranged from 1.9 to 71.9 mg g-1 of product or 1649 to 31,266 particles g-1 of product. The large majority ( > 95%) of particles in products surveyed were less than the 300 μm minimum diameter, indicating that previous environmental surveys could be underestimating microplastic contamination. To account for smaller particles as well as microfibers from synthetic textiles, we strongly recommend that future surveys consider methods that materials < 300 μm in diameter.
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Affiliation(s)
- Jeremy L Conkle
- Department of Physical & Environmental Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Unit 5892, Corpus Christi, Texas, 78412, USA.
| | | | - Jeffrey W Turner
- Department of Life Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Unit 5858, Corpus Christi, Texas, 78412, USA
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Nilsson WB, Turner JW. The thermostable direct hemolysin-related hemolysin (trh) gene of Vibrio parahaemolyticus: Sequence variation and implications for detection and function. J Microbiol Methods 2016; 126:1-7. [PMID: 27094247 DOI: 10.1016/j.mimet.2016.04.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 04/05/2016] [Accepted: 04/06/2016] [Indexed: 02/08/2023]
Abstract
Vibrio parahaemolyticus is a leading cause of bacterial food-related illness associated with the consumption of undercooked seafood. Only a small subset of strains is pathogenic. Most clinical strains encode for the thermostable direct hemolysin (TDH) and/or the TDH-related hemolysin (TRH). In this work, we amplify and sequence the trh gene from over 80 trh+strains of this bacterium and identify thirteen genetically distinct alleles, most of which have not been deposited in GenBank previously. Sequence data was used to design new primers for more reliable detection of trh by endpoint PCR. We also designed a new quantitative PCR assay to target a more conserved gene that is genetically-linked to trh. This gene, ureR, encodes the transcriptional regulator for the urease gene cluster immediately upstream of trh. We propose that this ureR assay can be a useful screening tool as a surrogate for direct detection of trh that circumvents challenges associated with trh sequence variation.
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Affiliation(s)
- William B Nilsson
- Environmental and Fisheries Science Division, Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 2725 Montlake Blvd. E., Seattle, WA 98112, USA.
| | - Jeffrey W Turner
- Environmental and Fisheries Science Division, Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 2725 Montlake Blvd. E., Seattle, WA 98112, USA
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Turner JW, Malayil L, Guadagnoli D, Cole D, Lipp EK. Detection of Vibrio parahaemolyticus, Vibrio vulnificus and Vibrio cholerae with respect to seasonal fluctuations in temperature and plankton abundance. Environ Microbiol 2013; 16:1019-28. [PMID: 24024909 DOI: 10.1111/1462-2920.12246] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 07/09/2013] [Accepted: 08/08/2013] [Indexed: 12/01/2022]
Abstract
Over a 1-year period, bi-monthly estuarine surface water and plankton samples (63-200 and > 200 μm fractions) were assayed by polymerase chain reaction for the prevalence of total Vibrio parahaemolyticus, V. vulnificus and V. cholerae and select genes associated with clinical strains found in each species. Neither temperature nor plankton abundance was a significant correlate of total V. parahaemolyticus; however, the prevalence of genes commonly associated with clinical strains (trh, tdh, ORF8) increased with temperature and copepod abundance (P < 0.05). The prevalence of total V. vulnificus and the siderophore-related viuB gene also increased with temperature and copepod and decapod abundance (P < 0.001). Temperature and copepod abundance also covaried with the prevalence of V. cholerae (P < 0.05), but there was no significant relationship with ctxA or other genes commonly found in clinical strains. Results show that genes commonly associated with clinical Vibrio strains were more frequently detected in association with chitinous plankton. We conclude that V. parahaemolyticus, V. vulnificus, V. cholerae and subpopulations that harbour genes common to clinical strains respond distinctly to seasonal changes in temperature as well as shifts in the taxonomic composition of discrete plankton fractions.
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Affiliation(s)
- Jeffrey W Turner
- Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, Seattle, WA, 98112, USA; School of Oceanography, University of Washington, Seattle, WA, 98195, USA
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Xu J, Turner JW, Idso M, Biryukov SV, Rognstad L, Gong H, Trainer VL, Wells ML, Strom MS, Yu Q. In situ strain-level detection and identification of Vibrio parahaemolyticus using surface-enhanced Raman spectroscopy. Anal Chem 2013; 85:2630-7. [PMID: 23356387 DOI: 10.1021/ac3021888] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The outer membrane of a bacterium is composed of chemical and biological components that carry specific molecular information related to strains, growth stages, expressions to stimulation, and maybe even geographic differences. In this work, we demonstrate that the biochemical information embedded in the outer membrane can be used for rapid detection and identification of pathogenic bacteria using surface-enhanced Raman spectroscopy (SERS). We used seven different strains of the marine pathogen Vibrio parahaemolyticus as a model system. The strains represent four genetically distinct clades isolated from clinical and environmental sources in Washington, U.S.A. The unique quasi-3D (Q3D) plasmonic nanostructure arrays, optimized using finite-difference time-domain (FDTD) calculations, were used as SERS-active substrates for sensitive and reproducible detection of these bacteria. SERS barcodes were generated on the basis of SERS spectra and were used to successfully detect individual strains in both blind samples and mixtures. The sensing and detection methods developed in this work could have broad applications in the areas of environmental monitoring, biomedical diagnostics, and homeland security.
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Affiliation(s)
- Jiajie Xu
- Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, United States
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Turner JW, Paranjpye RN, Landis ED, Biryukov SV, González-Escalona N, Nilsson WB, Strom MS. Population structure of clinical and environmental Vibrio parahaemolyticus from the Pacific Northwest coast of the United States. PLoS One 2013; 8:e55726. [PMID: 23409028 PMCID: PMC3567088 DOI: 10.1371/journal.pone.0055726] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Accepted: 12/29/2012] [Indexed: 11/18/2022] Open
Abstract
Vibrio parahaemolyticus is a common marine bacterium and a leading cause of seafood-borne bacterial gastroenteritis worldwide. Although this bacterium has been the subject of much research, the population structure of cold-water populations remains largely undescribed. We present a broad phylogenetic analysis of clinical and environmental V. parahaemolyticus originating largely from the Pacific Northwest coast of the United States. Repetitive extragenic palindromic PCR (REP-PCR) separated 167 isolates into 39 groups and subsequent multilocus sequence typing (MLST) separated a subset of 77 isolates into 24 sequence types. The Pacific Northwest population exhibited a semi-clonal structure attributed to an environmental clade (ST3, N = 17 isolates) clonally related to the pandemic O3:K6 complex and a clinical clade (ST36, N = 20 isolates) genetically related to a regionally endemic O4:K12 complex. Further, the identification of at least five additional clinical sequence types (i.e., ST43, 50, 65, 135 and 417) demonstrates that V. parahaemolyticus gastroenteritis in the Pacific Northwest is polyphyletic in nature. Recombination was evident as a significant source of genetic diversity and in particular, the recA and dtdS alleles showed strong support for frequent recombination. Although pandemic-related illnesses were not documented during the study, the environmental occurrence of the pandemic clone may present a significant threat to human health and warrants continued monitoring. It is evident that V. parahaemolyticus population structure in the Pacific Northwest is semi-clonal and it would appear that multiple sequence types are contributing to the burden of disease in this region.
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Affiliation(s)
- Jeffrey W Turner
- Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, Washington, USA.
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Malayil L, Turner JW, Mote BL, Howe K, Lipp EK. Evaluation of enrichment media for improved PCR-based detection of V. cholerae and V. vulnificus from estuarine water and plankton. J Appl Microbiol 2011; 110:1470-5. [PMID: 21395948 DOI: 10.1111/j.1365-2672.2011.04996.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS Pathogenic Vibrio spp., including V. cholerae and V. vulnificus, are commonly found along the estuaries of the south-east United States; however, it is often difficult to recover these species directly from environmental samples. Pre-enrichment assays are commonly used to improve the detection of pathogenic vibrios from environmental sources. Here, we evaluated a novel enrichment procedure using freshly collected and autoclaved natural estuarine water amended with 1% peptone (designated as estuarine peptone water, EPW) and compared it to traditional alkaline peptone water (APW) for detection by PCR of V. cholerae and V. vulnificus. METHODS AND RESULTS Of the 50 samples collected in total, V. cholerae DNA was detected in APW 10% of the time and in EPW 40% of the time. Likewise, the cholera toxin gene (ctxA) was detected in 4 vs 18% of the samples using APW and EPW, respectively. Conversely, APW showed improved recovery for V. vulnificus relative to EPW with respective detection frequencies of 46 and 20%. Results showed similar patterns across different sample types (water and plankton). CONCLUSIONS While enrichment in traditional APW was adequate for the recovery of Vibrio vulnificius, use of sterile estuarine water amended with peptone significantly improved the detection of V. cholerae and the virulence gene ctxA from estuarine sources.
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Affiliation(s)
- L Malayil
- Department of Environmental Health Science, The University of Georgia, Athens, GA 30602, USA
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Sutherland KP, Porter JW, Turner JW, Thomas BJ, Looney EE, Luna TP, Meyers MK, Futch JC, Lipp EK. Human sewage identified as likely source of white pox disease of the threatened Caribbean elkhorn coral, Acropora palmata. Environ Microbiol 2010; 12:1122-31. [PMID: 20132278 DOI: 10.1111/j.1462-2920.2010.02152.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Caribbean elkhorn coral, Acropora palmata, has been decimated in recent years, resulting in the listing of this species as threatened under the United States Endangered Species Act. A major contributing factor in the decline of this iconic species is white pox disease. In 2002, we identified the faecal enterobacterium, Serratia marcescens, as an etiological agent for white pox. During outbreaks in 2003 a unique strain of S. marcescens was identified in both human sewage and white pox lesions. This strain (PDR60) was also identified from corallivorious snails (Coralliophila abbreviata), reef water, and two non-acroporid coral species, Siderastrea siderea and Solenastrea bournoni. Identification of PDR60 in sewage, diseased Acropora palmata and other reef invertebrates within a discrete time frame suggests a causal link between white pox and sewage contamination on reefs and supports the conclusion that humans are a likely source of this disease.
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Turner JW, Good B, Cole D, Lipp EK. Plankton composition and environmental factors contribute to Vibrio seasonality. ISME J 2009; 3:1082-92. [PMID: 19421235 DOI: 10.1038/ismej.2009.50] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Raebiger JW, Turner JW, Noll BC, Curtis CJ, Miedaner A, Cox B, DuBois DL. Electrochemical Reduction of CO2 to CO Catalyzed by a Bimetallic Palladium Complex. Organometallics 2006. [DOI: 10.1021/om060228g] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- James W. Raebiger
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Jeffrey W. Turner
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Bruce C. Noll
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Calvin J. Curtis
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Alex Miedaner
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Brian Cox
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
| | - Daniel L. DuBois
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556-5670
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Affiliation(s)
- J W Turner
- Durham Veterans Affairs Medical Center and Duke University Medical Center, Durham, North Carolina, USA
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Liu IKM, Turner JW, Van Leeuwen EMG, Flanagan DR, Hedrick JL, Murata K, Lane VM, Morales-Levy MP. Erratum: Persistence of anti-zonae pellucidae antibodies following a single inoculation of porcine zonae pellucidae in the domestic equine. Reproduction 2005. [DOI: 10.1530/rep.1.00168e] [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: 11/08/2022]
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Liu IKM, Turner JW, Van Leeuwen EMG, Flanagan DR, Hedrick JL, Murata K, Lane VM, Morales-Levy MP. Persistence of anti-zonae pellucidae antibodies following a single inoculation of porcine zonae pellucidae in the domestic equine. Reproduction 2005; 129:181-90. [PMID: 15695612 DOI: 10.1530/rep.1.00168] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this study of equids, we investigated the antibody response and the effect on the estrous cycle following a single inoculation of porcine zonae pellucidae (pZP) employing controlled-release methodology. We also investigated the use of two different water-soluble adjuvants as an alternative to oil-based adjuvants. Twenty-seven domestic mares were inoculated with various formulations of pZP and adjuvant. We showed that the anti-pZP antibodies generated as a result of the inoculations persisted for at least 43 weeks (length of the study). Of the various formulations used in the study, pZP and QS-21 water-soluble adjuvant, administered in combination with an emulsified preparation of pZP and Freund’s Complete Adjuvant generated a significantly (P < 0.05) higher titer of anti-pZP antibodies when compared with other formulations employing the water-soluble adjuvant, Carbopol. Hormone analyses for cyclicity indicated a high incidence and extended duration of persistent corpora lutea among the treated mares. The positive control group of mares receiving two standard inoculations of pZP and Freund’s Complete and Incomplete Adjuvants, as well as the placebo group of mares injected with QS-21 only, also exhibited high incidences of persistent corpora lutea. However, all mares eventually returned to normal cyclicity. The basis for the high incidence and extended duration of persistent corpora lutea was unexplained. The results demonstrate for the first time the persistent generation of anti-pZP antibodies following a single inoculation of pZP incorporated into a controlled-released preparation in the horse. This study further suggests that a single inoculation of pZP sequestered in a controlled-release lactide-glycolide polymer may serve as an alternative to traditional two-inoculation protocols for contraception investigations in the equine.
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Affiliation(s)
- I K M Liu
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, California 95616, USA.
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Naugle RE, Rutberg AT, Underwood HB, Turner JW, Liu IKM. Field testing of immunocontraception on white-tailed deer (Odocoileus virginianus) on Fire Island National Seashore, New York, USA. Reprod Suppl 2003; 60:143-53. [PMID: 12220154] [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] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Application of contraception for the control of suburban populations of white-tailed deer (Odocoileus virginianus) has been much debated, but few data are available on field applications and even fewer on population effects. Between 1993 and 1997, 74-164 individually known female deer living on Fire Island, New York, USA, were treated remotely with an initial shot of 65 microg porcine zona pellucida (PZP) in Freund's complete adjuvant followed by booster injections of 65 microg PZP in Freund's incomplete adjuvant. Starting in 1996, progressively increasing numbers of deer were treated with vaccinating/marking darts. Estimates of population density and composition, using distance sampling methods, began in 1995 in selected portions of the study area. Between 1993 and 1997, fawning rates among individually known, treated adult females decreased by 78.9% from pretreatment rates. Population density in the most heavily treated area increased by 11% per year from 1995 to March 1998 and then decreased at 23% per year to October 2000. In 1999-2000 surveys, fawns comprised 13-14% of the total population in the most heavily treated area, versus 16-33% in nearby untreated areas. These results show that PZP can be delivered effectively to sufficient deer to affect population density and composition in some environments, but that technical and logistical improvements are needed before contraception can be used widely to manage suburban deer populations.
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Affiliation(s)
- R E Naugle
- The Humane Society of the United States,Washington, DC 20037, USA
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Turner JW, Liu IKM, Flanagan DR, Bynum KS, Rutberg AT. Porcine zona pellucida (PZP) immunocontraception of wild horses (Equus caballus) in Nevada: a 10 year study. Reprod Suppl 2003; 60:177-86. [PMID: 12220157] [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] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Porcine zona pellucida (PZP) immunocontraception was investigated for possible use in free-roaming wild horses in the western USA. A protocol of two injections (3-4 weeks apart) of vaccine lasting 1 year was first used and a single-injection controlled-release vaccine of 1 year duration was developed and tested in the field. Studies of a presumptive vaccine of 2 year duration were initiated. The parameters of anti-PZP antibody titre response, pregnancy testing and offspring production were used, and PZP vaccine was found to provide up to 94% infertility in free-roaming wild mares. In addition, a single-injection PZP vaccine of 1 year duration and containing a controlled-release component of PZP in a polymer matrix can provide infertility equivalent to the two-injection PZP vaccine. All the PZP vaccine preparations tested were associated with a return to normal fertility within 1 year. During the course of these studies, attention was given to practical aspects of management application of PZP contraception. Preparation of the controlled-release portion of the vaccine in pellets, which fit into the needle of a dart or syringe, has simplified vaccine handling and permitted long-term storage of the controlled-release component. Vaccine delivery is now performed using a jabstick on captured mares restrained in a field stock chute during routine horse gathers. Provision of a vaccine-training programme has maximized personnel safety during vaccine preparation and use.
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Affiliation(s)
- J W Turner
- Physiology and Molecular Medicine, Medical College of Ohio, Toledo 43614-5804, USA.
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Turner JW, Schultz FA. Electrochemical Activation Parameters of Coupled Electron-Transfer and Spin-Exchange Reactions. Experimental Studies of [M(Tacn)2]3+/2+ and [Fe(Pzb)2]+/0 Redox Systems. J Phys Chem B 2002. [DOI: 10.1021/jp013294z] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [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)
- Jeffrey W. Turner
- Department of Chemistry, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202-3274
| | - Franklin A. Schultz
- Department of Chemistry, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202-3274
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Abstract
This paper reviews the emergence of telemedicine and its recent expansion and use within the healthcare industry. Through this review, several examples of telemedicine within a variety of applications provide a broad context to discuss the challenges and opportunities facing the emergence of e-medicine. These examples provide snapshots of a teleradiology system used by the military, teleconsultations used in neurosurgery and hemodialysis, and home telemedicine used in diabetes care. Based on the discussion of telemedicine's history and expansion and the examples provided, a framework is offered for understanding the evolution of telemedicine applications through four stages. These stages include: (a) development of basic technological capabilities, (b) development of relevant applications, (c) the integration of technical applications within a complex environment, and (d) transformation of the operating environment. Implications for this framework are discussed.
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Affiliation(s)
- S K Mun
- Department of Radiology, Georgetown University, Washington, DC 20007, USA.
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Affiliation(s)
- J W Turner
- Department of Chemistry, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202-3274, USA
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Abstract
The ribonucleoprotein telomerase holoenzyme is minimally composed of a catalytic subunit, hTERT, and its associated template RNA component, hTR. We have previously found two additional components of the telomerase holoenzyme, the chaperones p23 and heat shock protein (hsp) 90, both of which are required for efficient telomerase assembly in vitro and in vivo. Both hsp90 and p23 bind specifically to hTERT and influence its proper assembly with the template RNA, hTR. We report here that the hsp70 chaperone also associates with hTERT in the absence of hTR and dissociates when telomerase is folded into its active state, similar to what occurs with other chaperone targets. Our data also indicate that hsp90 and p23 remain associated with functional telomerase complexes, which differs from other hsp90-folded enzymes that require only a transient hsp90.p23 binding. Our data suggest that components of the hsp90 chaperone complex, while required for telomerase assembly, remain associated with active enzyme, which may ultimately provide critical insight into the biochemical properties of telomerase assembly.
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Affiliation(s)
- H L Forsythe
- Departments of Pathology and Human Genetics, Massey Cancer Center, Medical College of Virginia at Virginia Commonwealth University, Richmond, Virginia 23298-0662, USA
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Kirkpatrick JF, Turner JW, Liu IK, Fayrer-Hosken R, Rutberg AT. Case studies in wildlife immunocontraception: wild and feral equids and white-tailed deer. Reprod Fertil Dev 2001; 9:105-10. [PMID: 9109199 DOI: 10.1071/r96052] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Non-lethal management methods are required for wild equids that are protected by law and for deer inhabiting areas where lethal controls are not legal or safe. Single or multiple inoculations of porcine zona pellucida (PZP) vaccine have been delivered to wild horses and deer by means of darts. Contraceptive efficacy in horses after two inoculations ranged from 90% to 100%, and after a single inoculation ranged from 19% to 28%. Mares given a controlled-release form of the vaccine had foaling rates ranging from 7% to 20%. No detectable changes in social organization or behaviours among treated horses occurred. Contraceptive effects were reversible after 4 consecutive years of treatment but 5-7 years of treatment resulted in ovulation failure and decreased urinary oestrogen concentrations. Among deer, two inoculations were 70-100% effective in preventing fawns, but one inoculation yielded a contraceptive efficacy of < or = 20%, with pregnancies occurring late in the breeding season; a single annual booster inoculation reduced fertility to 20% in the second year. Energy costs of extended breeding seasons were less than those resulting from pregnancy. After two years of treatment, ovaries appeared normal. These studies suggest that PZP immunocontraception can be successfully applied to certain free-roaming populations of wild horses and deer.
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Gilman SC, Turner JW. Media richness and social information processing: rationale for multifocal continuing medical education activities. J Contin Educ Health Prof 2001; 21:134-139. [PMID: 11563218 DOI: 10.1002/chp.1340210303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Academic business communication has studied the results of media selection in organizations. Little of this work has been discussed in the context of continuing medical education (CME); however, it may apply to improving the design of educational activities. This article reviews literature on media richness and social information processing theories. The concept of media richness suggests that media choice results from a match between the objective characteristics of the medium and the content requirements of a message. In this context, media include face-to-face conversation and print and electronic media. Social information processing theory suggests that media selection is also based on participants' social norms for how information is communicated in their environment and the participants' familiarity with specific media types. Appraisal of CME with respect to these theories suggests that the complex relationship of CME content and CME participant environments invites the most effective strategies of multiple media experienced over time in what might be called multifocal continuing medical education.
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Affiliation(s)
- S C Gilman
- Employee Education System, Department of Veterans Affairs, Long Beach Employee Education Resource Center (OOE), 5901 East 7th Street, Long Beach, CA 90822, USA
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Abstract
Prison inmates were surveyed about their perceptions of the use of videoconferencing in clinical consultations. A 14-item questionnaire was used to assess satisfaction with the patient-physician clinical interaction. Of the 299 inmates surveyed immediately after their teleconsultations, 221 completed questionnaires that were suitable for analysis (74%). Only 9% of patients indicated that they were not satisfied with the teleconsultation. They rated the telemedicine context well above the midpoint of the scale (16) on both an information-exchange and a patient-comfort dimension, with means of 29 and 24, respectively. There was a significant difference (P < 0.01) in the patient-comfort dimension in terms of the location of the prisoners. No significant differences were found in patient satisfaction related to the specialty of the physician. The results suggest that many contextual factors must be considered to understand the communicative implications of patient satisfaction with telemedicine.
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Affiliation(s)
- H Mekhjian
- Ohio State University Medical Center, USA
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Abstract
PURPOSE This study examined flexural properties of acetal resin to determine the appropriate design for an acetal resin removable partial denture clasp. The effectiveness of various acetal resin polishing procedures was also evaluated using scanning electron microscopy. MATERIALS AND METHODS Loads of up to 1,500 g were applied to cylindrical acetal resin specimen lengths of 5, 10, and 15 mm, and the degree of deflection of the specimen tip was measured. Specimens were 2 mm and 1.5 mm in diameter with a round cross-section (R2 and R1.5, respectively), as well as 2 mm in diameter and half-round in cross-section. Half-round specimens were loaded with their flat surface vertical and then horizontal (HRV and HRH, respectively). Contour plots showing load and deflection for varying lengths of resin were developed for each cross-sectional type based on specimen length, and the stiffness was calculated. Additional acetal resin specimens underwent polishing techniques including tungsten carbide burs, aluminium oxide stones, abrasive impregnated rubber points, and "Polish-D." Polished specimens were examined with scanning electron microscopy to compare surface roughness. RESULTS For the 5-mm-length specimens, the median stiffness values decreased in the following order: R2 > HRV > HRH > R1.5. The median stiffness values for the 10-mm and 15-mm lengths followed a similar trend. At each length, the R2 specimen was generally at least twice as stiff as other designs. Regarding polishing, the smoothest surface was seen on the specimen that was polished with the rubber point followed by "Polish-D." CONCLUSIONS To have stiffness similar to a cast cobalt-chromium clasp 15 mm long and 1 mm in diameter, a suitable acetal resin clasp must be shorter (approximately 5 mm) with greater cross-sectional diameter (approximately 1.4 mm). To obtain a smooth surface, the acetal resin clasp should be polished with a rubber point followed by a material such as "Polish-D."
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Affiliation(s)
- J W Turner
- Division of Prosthetic Dentistry, Guy's Dental Institute, London, UK
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Frazier EL, Sprott LR, Sanders JO, Dahm PF, Crouch JR, Turner JW. Sire marbling score expected progeny difference and weaning weight maternal expected progeny difference associations with age at first calving and calving interval in Angus beef cattle. J Anim Sci 1999; 77:1322-8. [PMID: 10375207 DOI: 10.2527/1999.7761322x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Field records from the American Angus Association were used to study the associations of sire marbling score EPD and sire weaning weight maternal (milk) EPD with age at first calving (AFC) and calving interval (CI). Cows were selected based on the accuracy of their sire's milk (> or =.7) or marbling (> or =.6) EPD. The data were screened using biological constraints, and regression models were used to identify records that were greater than 5 SD from the mean. The AFC was modeled for both milk and marbling data sets to account for effects of year, sire EPD, and their interaction. The CI was subdivided into first, second, and mature calving interval traits and modeled to account for state, year, calf sex, calf birth weight (BW), calf weaning weight (WW), sire EPD, and interactions of EPD with year and state. Derivative-free REML was used to estimate heritability and genetic correlations for AFC and CI. Sire milk EPD and marbling EPD were predictors of AFC (P < .001); however, pooled estimates were unreliable because of state x EPD interactions (P < .001). Increases in sire milk EPD resulted in reductions in AFC; however, there was no consistent pattern to effects of marbling EPD increases. Models accounted for < 8% of variation in AFC. Sire milk EPD was not a predictor of first, second, or mature CI (P > .1). Sire marbling score EPD was not a predictor of second, or mature CI (P > .1); however, it was associated (P = .059) with first CI, although regression estimates varied across states and prevented pooling. The BW, sex, and WW were predictors of CI (P < .001). Increases in BW resulted in longer mature CI, and mature CI decreased as WW increased. The AFC was heritable (.22), and CI traits had heritabilities ranging from .01 to .03. The AFC was genetically correlated with first CI (-.6) and mature CI (-.93). Genetic correlations between CI traits were uninterpretable because of low additive genetic variances. In conclusion, sire marbling score and milk EPD do not seem to be reliable predictors of AFC or CI. The BW and WW have significant but small effects on AFC and CI. Selection for AFC is possible, but earlier calving heifers may have longer calving intervals.
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Affiliation(s)
- E L Frazier
- Department of Animal Science, Texas A&M University, College Station 77843-2471, USA
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Pacht ER, Turner JW, Gailiun M, Violi LA, Ralston D, Mekhjian HS, St John RC. Effectiveness of telemedicine in the outpatient pulmonary clinic. Telemed J 1999; 4:287-92. [PMID: 10220468 DOI: 10.1089/tmj.1.1998.4.287] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Over the past several years, there has been a resurgence of interest in telemedicine. Despite this renewed interest, some health care providers remain skeptical regarding the effectiveness of telemedicine for the delivery of health care. OBJECTIVE The objective of this prospective, crossover study was to determine if there was any difference between care delivered using video conferencing-based telemedicine technology and that given by a traditional face-to-face encounter in a pulmonary medicine clinic. METHODS Two pulmonologists sequentially examined 40 individuals via video conferencing-based telemedicine technology and by the traditional face-to-face method. Two additional pulmonologists, in a blinded fashion, compared the results for consistency in the history, examination with focus on auscultation of the lungs, diagnostic impression, and evaluation and treatment plans. RESULTS Evaluation of patients by telemedicine was as effective as the traditional mode. The telemedicine physician and the physician examining the patient in the traditional manner were able to elicit the same key complaints and hear the same adventitious sounds on auscultation of the lungs. CONCLUSION Telemedicine can enable the provision of high-quality care in a pulmonary clinic setting.
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Affiliation(s)
- E R Pacht
- The Telemedicine Center and the Division of Pulmonary and Critical Care, Department of Internal Medicine, The Ohio State University Medical Center, Columbus, Ohio, USA
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Turner JW, Schultz FA. Intramolecular and Environmental Contributions to Electrode Half-Reaction Entropies of M(tacn)23+/2+ (M = Fe, Co, Ni, Ru; tacn = 1,4,7-Triazacyclononane) Redox Couples. Inorg Chem 1998. [DOI: 10.1021/ic980977t] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [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)
- Jeffrey W. Turner
- Department of Chemistry, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202-3274
| | - Franklin A. Schultz
- Department of Chemistry, Indiana University Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202-3274
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Taylor JF, Coutinho LL, Herring KL, Gallagher DS, Brenneman RA, Burney N, Sanders JO, Turner JW, Smith SB, Miller RK, Savell JW, Davis SK. Candidate gene analysis of GH1 for effects on growth and carcass composition of cattle. Anim Genet 1998; 29:194-201. [PMID: 9720178 DOI: 10.1046/j.1365-2052.1998.00317.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We present an approach to evaluate the support for candidate genes as quantitative trait loci (QTLs) within the context of genome-wide map-based cloning strategies. To establish candidacy, a bacterial artificial chromosome (BAC) clone containing a putative candidate gene is physically assigned to an anchored linkage map to localise the gene relative to an identified QTL effect. Microsatellite loci derived from BAC clones containing an established candidate gene are integrated into the linkage map facilitating the evaluation by interval analysis of the statistical support for QTL identity. Permutation analysis is employed to determine experiment-wise statistical support. The approach is illustrated for the growth hormone 1 (GH1) gene and growth and carcass phenotypes in cattle. Polymerase chain reaction (PCR) primers which amplify a 441 bp fragment of GH1 were used to systematically screen a bovine BAC library comprising 60,000 clones and with a 95% probability of containing a single copy sequence. The presence of GH1 in BAC-110R2C3 was confirmed by sequence analysis of the PCR product from this clone and by the physical assignment of BAC110R2C3 to bovine chromosome 19 (BTA19) band 22 by fluorescence in situ hybridisation (FISH). Microsatellite KHGH1 was isolated from BAC110R2C3 and scored in 529 reciprocal backcross and F2 fullsib progeny from 41 resource families derived from Angus (Bos taurus) and Brahman (Bos indicus). The microsatellite KHGH1 was incorporated into a framework genetic map of BTA19 comprising 12 microsatellite loci, the erythrocyte antigen T and a GH1-TaqI restriction fragment length polymorphism (RFLP). Interval analysis localised effects of taurus vs. indicus alleles on subcutaneous fat and the percentage of either extractable fat from the Iongissimus dorsi muscle to the region of BTA19 harbouring GH1.
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Affiliation(s)
- J F Taylor
- Department of Animal Science, Texas A&M University, College Station 77843-2471, USA
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39
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Abstract
The purpose of this research was to develop and partially assess a self-report scale for measuring doctors' and patients' perceptions of self-communication and other communication competence during a medical interview. Previous research into the components of communication competence and medical discourse were used to develop the Medical Communication Competence Scale (MCCS). It was hypothesized that the items of the MCCS would form four clusters: information giving, information seeking, information verifying, and socioemotional communication. The cluster analysis results provided support for the hypothesis. Results of several other analyses provided additional support for the validity of the MCCS.
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Affiliation(s)
- D J Cegala
- Department of Communication, The Ohio State University, Columbus 43210, USA.
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40
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Abstract
We have developed a genetic map of BTA10 based on 8952 informative meioses for 13 microsatellite markers and the erythrocyte antigen Z. With the exception of OarAE64, the support for the order of all loci in the map exceeded a LOD > 3.0. The length of the BTA10 genetic map was 87.0 centimorgans (cM). The 14-marker, sex-average map in Kosambi cM was: CSSM38-8.9-BM1237-5.2-HH8A-2.6- INRA69-10.6-TGLA378-0.8-BM6305-17.2- TGLA102-17.9-INRA96-0.3-CSRM60-9.2- DIK20-3.0-EAZ-6.7-CSSM46-3.7-SRCRSP3-1.0-OarA E64 with an average interval of 6.70 cM. The microsatellite INRA69 was recently assigned to the pseudoautosomal region of the bovine X chromosome by linkage analysis. However, we found that twopoint support for linkage between INRA69 and 15 X-linked bovine microsatellites was LOD < 0.50 in 529 reciprocal backcross and F2 fullsib progeny. We performed twopoint analyses of INRA69 against 275 markers distributed throughout the bovine genome and found significant associations with a LOD > 3.0 only between INRA69 and eight BTA10 microsatellite loci. Consequently, we excluded INRA69 from the genetic map of the X chromosome and reassign this microsatellite to BTA10.
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Affiliation(s)
- J F Taylor
- Department of Animal Science, Texas A&M University, College Station 77843-2471, USA
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Cooper CS, Turner JW. Focal xanthogranulomatous pyelonephritis in a 12-year-old Alaskan native. J Urol 1997; 157:632-3. [PMID: 8996384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- C S Cooper
- Department of Urology, University of Iowa Hospitals and Clinics, Iowa City, USA
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Abstract
Regulation of local overpopulations of free-roaming feral equids is in demand worldwide for ecological balance and habitat preservation. Contraceptive vaccines have proven effective in feral horses, which breed seasonally, but no data are available for equids such as the burro, which is reproductively active all year round. In the present study, 27 individually identified female feral burros (Equus asinus) roaming free in Virgin Islands National Park (St John, US Virgin Islands; Lesser Antilles) were remotely treated with pig zonae pellucidae (PZP) vaccine. Between January and May, 16 burros were darted with a 1 ml emulsion of PZP plus Freund's adjuvant. Ten to twelve months later each treated burro was given a single booster injection of PZP plus adjuvant to maintain contraception through a second year. Eleven adult untreated jennies served as controls. Beginning one year after initial vaccination, these burros were monitored for pregnancy and foal production. Collection of data to determine treatment effect was not begun until 12 months after initial treatment to ensure that pregnancies existing before vaccination were not included. Pregnancy was assessed using previously validated methods for steroid metabolite measurement in fresh faecal samples. None of the PZP-treated burros produced foals between 0 and 12 months after the last inoculation. One PZP-treated burro tested positive for pregnancy at 10 months after the final inoculation. During this same period, six of 11 untreated burros tested pregnancy-positive, and four were observed with foals. There was no difference in pregnancy rates among treated, control and randomly sampled jennies between 12 and 24 months after the last inoculation. The results demonstrate that, in free-roaming feral burros that are reproductively active all year round: (1) burros can be accessed for remotely delivered PZP vaccination; (2) PZP contraception is effective; (3) PZP contraception is reversible; and (4) pregnancy can be reliably detected by faecal steroid analysis.
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Affiliation(s)
- J W Turner
- Department of Physiology and Molecular Medicine, Medical College of Ohio, Toledo 43699, USA
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Abstract
Palladium-103 (Pd-103) is introduced in brachytherapy procedures because of its favorable physical properties, including its low energy, rapid dose fall-off, short half-life, and total cumulative dose delivery at a higher dose rate than iodine-125 (I-125) isotope. Intraoperative brachytherapy using I-125 pellets was reported to provide significant palliation and meaningful prolongation of life in highly selected patients with unresectable carcinoma of the pancreas. After considering some of the advantages of Pd-103 over I-125, we designed a phase I-II clinical trial to assess the feasibility of intraoperative Pd-103 in unresectable carcinoma of the pancreas to study the related morbidity when combined with chemotherapy and external beam radiation, and to evaluate the impact on palliation and local control rates. Between December 1989 and December 1993, 15 patients with biopsy-proven unresectable adenocarcinoma of the pancreas were treated with interstitial Pd-103 implants during laparotomy. In 13 patients the lesion was located in the head of the pancreas, in one patient in the uncinate process, and in one patient in the body of the pancreas. The stage distribution was as follows: T1 = 2; T2 = 6, and T3 = 7. In addition, all patients underwent biliary and gastric bypass. The mean number of Pd-103 pellets was 45; the mean total activity to obtain a matched peripheral dose (MPD) of 11,000 cGy was 68.9 mCi. The mean tumor volume encompassing the MPD was 16.5 cc. All patients received postoperative external beam radiation (4,500 cGy over 4 1/2 weeks) and chemotherapy (5-fluorouracil and mitomycin C). This combined treatment, consisting of intraoperative brachytherapy using Pd-103 and postoperative external beam radiation with chemotherapy, was well tolerated in all patients. These were no treatment-related mortalities, and no serious complications, such as bleeding or fistula formation. Pain relief was obtained within 3-6 weeks in 10 out of 12 patients presenting with pain. Survival ranged from 6 to 24 months (median 10 months). The study suggests that Pd-103 can be considered an alternative to I-125 for interstitial brachytherapy for unresectable carcinoma of the pancreas. Symptom relief appeared to occur faster and complications are significantly less. However, this study did not show any improvement in the median survival rate over I-125 due to the advanced stage cancer in the majority of patients in the study.
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Affiliation(s)
- D Nori
- Department of Radiation Oncology, New York Hospital-Cornell Medical Center, Flushing, New York 11355-5095, USA
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Abstract
Three hundred eighty reciprocal backcross and F(2) full sib progeny from 33 families produced by embryo transfer from 77 Angus (Bos taurus), Brahman (Bos indicus), and F1 parents and grandparents were used to construct genetic maps of the bovine X and Y chromosomes. Ml individuals were scored for 15 microsatellite loci, with an average of 608 informative meioses per locus. The length of the bovine X chromosome genetic map was 118.7 cM (female only) and of the pseudoautosomal region was 13.0 cM (male only). The 15-marker framework map in Kosambi centimorgans is [BM6017-6.1 -TGLA89-35.8-TEXAN13-3.4-TGLA128-1.3 -BM2713 -21.1 -BM4604-2.4-BR215 - 12.9-TGLA68-10.0-BM4321 - 1.0-HEL14-4.9-TGLA15-2.3-INRA12O- 12.5-TGLA325- 1.6-MAF45-3.2-INRA3O], with an average interval of 7.91 cM. Clones containing pseudoautosomal or sex-linked microsatellites were isolated from a bovine bacterial artificial chromosome library and were physically mapped to bovine metaphase chromosomes by fluorescence in situ hybridization to orient the X and Y chromosome maps. BAC57, containing the pseudoautosomal microsatellite INRA3O, mapped to the distal end of the long arm of the X chromosome at q42-ter and to the short arm of the Y chromosome at p13-ter. This confirms the published assignment of this region to Ypl2-ter, but challenges the published assignment of Xpl4-ter and thus reorients the X chromosome physical map. BAC2O4, containing the X-linked microsatellite BM4604, mapped to the middle of the long arm of the X chromosome at q26-q31. The position of the physically mapped markers indicates either a lack of microsatellite markers for a large (30 to 50 cM) region of the short arm of the X chromosome or heterogeneity of recombination along the X chromosome.
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Affiliation(s)
- C C Yeh
- Department of Animal Science, Texas A&M University 77843-4607, USA
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Abstract
Two hundred and nine reciprocal backcross and F2 progeny produced by embryo transfer from Angus (Bos taurus) and Brahman (Bos indicus) parents and their 60 parents and grandparents were utilized to localize the locus (POLL) responsible for the polled phenotype in a genetic map of bovine chromosome 1. Progeny were scored for polled, scurred, and horned phenotypes at 1 year of age and again following skull disection at slaughter at 20 months of age. Phenotype frequencies were independent of gender. One hundred and forty-two informative meioses for POLL and 13 microsatellite loci with an average of 267 informative meioses per locus contributed to a genetic map spanning 124.6 cM with an average interval of 9.6 cM. POLL mapped proximal to the centromere and 4.9 cM from TGLA49 supporting a previous study that employed two anonymous microsatellites. Difficulties in discriminating between scurred and horned phenotypes indicate that bracketing markers will be essential for refining the model for inheritance of the horned, scurred, and polled phenotypes and for effective marker assisted selection (MAS) for polled.
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Affiliation(s)
- R A Brenneman
- Department of Animal Science, Texas A&M University, College Station 77845-2471, USA
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Nori D, Merimsky O, Samala E, Saw D, Cortes E, Chen E, Turner JW. Tumor ploidy as a risk factor for disease recurrence and short survival in surgically-treated Dukes' B2 colon cancer patients. J Surg Oncol 1995; 59:239-42. [PMID: 7630171 DOI: 10.1002/jso.2930590408] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The risk factors for colon cancer recurrence following a curative intent surgery include the presence of metastatic disease, the tumor location and size, number of positive lymph nodes, the presence of adhesions, perforation, bowel obstruction, depth of invasion, histological grade, percentage of S-phase content, and cell kinetic profile. The DNA content of colon cancers in 20 Dukes' B2 patients in follow-up evaluation at our center, who relapsed, either locally or systemically following surgical treatment was measured by image analysis. The data were pair-matched for age, sex, tumor site, and grade with 20 Dukes' B2 patients who had no evidence of disease. Aneuploidy occurred in 16 (80%) patients with recurrence, as compared with only in 8 (40%) in the control group. Aneuploidy was associated with significantly higher tumor recurrence rate (P = 0.024) and shorter overall survival (P < 0.002). Our data may point out a possible indication for systemic adjuvant chemotherapy in Dukes' B2 colon cancer patients who have aneuploid tumors on image analysis. This warrants further investigation in a prospective controlled randomized study.
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Affiliation(s)
- D Nori
- Department of Radiation Oncology, New York Hospital Medical Center of Queens, Flushing 11355-5095, USA
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Turner JW. The use of a somatostatin analog in the treatment of an external pancreatic fistula. Mo Med 1994; 91:737-739. [PMID: 7854311] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A search of the scientific literature reveals several reports of the successful use of somatostatin and its analog octreotide for treatment of external pancreatic fistulas. Both somatostatin and octreotide have been reported to promote closure of external pancreatic fistulas at relatively shorter intervals than spontaneous closure. However, the benefits of somatostatin and somatostatin analog therapy appear to be limited to cases without other pathologic or anatomic complications. A case is presented of an external pancreatic fistula in which there was no such apparent complication and in which octreotide failed to shorten the time of fistula closure.
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Affiliation(s)
- J W Turner
- University of Oklahoma, School of Medicine, Oklahoma City 73190
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Abstract
The diagnosis of prostate cancer metastatic to bone currently is made with plain x-rays, radionuclide bone scans, and acid and alkaline phosphatases. We used magnetic resonance imaging (MRI) in 18 patients with known prostate cancer to resolve conflicting evidence of metastases found on bone scans, plain films and serum enzyme determinations. Of 8 bone scans interpreted as positive MRI was read as negative for metastatic disease in 2. Of 5 negative bone scans 1 MRI study was interpreted as positive. All 5 equivocal bone scans demonstrated no osseous lesions on MRI. In addition, in 6 patients with evidence of bone metastases the serial MRI scans following hormonal therapy demonstrated radiographic and clinical improvement. We conclude that MRI is helpful in the diagnosis of metastatic prostate cancer when other radiographic examinations are enigmatic and that MRI can be used to determine the response to hormonal treatment.
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Affiliation(s)
- J W Turner
- Department of Urology, University of Iowa Hospitals and Clinics, Iowa City
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Abstract
Patients who fail external radiation therapy for prostatic cancer pose a therapeutic challenge. No further external radiation treatment can be delivered safely to the local lesion, although some patients are candidates for salvage surgery. In this study, 31 patients who failed prior external beam radiotherapy received percutaneous transperineal placement of gold seeds (198Au). Initial prostate volume was 17.7 cc and decreased to 10 cc 24 months after 198Au implantation. Of 15 patients biopsied at 12 months after treatment, 4 (27%) were positive, 6 (40%) were negative, and 5 (33%) showed prostate cancer with radiation changes. Two of three patients have died of prostate cancer, with an overall 5-year estimated survival of 67%. Interstitial brachytherapy was found to be an additional well-tolerated treatment modality in this group of 31 patients.
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Affiliation(s)
- S A Loening
- Department of Urology, University of Iowa, Iowa City
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50
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Abstract
We report a case of prostatic adenocarcinoma in a thirty-year-old Native American. The tumor was an incidental autopsy finding. We speculate on the biological and clinical significance of prostate tumors in young males.
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Affiliation(s)
- C S Nielsen
- Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City
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