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Warner K, Sonti NF, Cook EM, Hallett RA, Hutyra LR, Reinmann AB. Urbanization exacerbates climate sensitivity of eastern United States broadleaf trees. Ecol Appl 2024:e2970. [PMID: 38602711 DOI: 10.1002/eap.2970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 01/17/2024] [Indexed: 04/12/2024]
Abstract
Tree growth is a key mechanism driving carbon sequestration in forest ecosystems. Environmental conditions are important regulators of tree growth that can vary considerably between nearby urban and rural forests. For example, trees growing in cities often experience hotter and drier conditions than their rural counterparts while also being exposed to higher levels of light, pollution, and nutrient inputs. However, the extent to which these intrinsic differences in the growing conditions of trees in urban versus rural forests influence tree growth response to climate is not well known. In this study, we tested for differences in the climate sensitivity of tree growth between urban and rural forests along a latitudinal transect in the eastern United States that included Boston, Massachusetts, New York City, New York, and Baltimore, Maryland. Using dendrochronology analyses of tree cores from 55 white oak trees (Quercus alba), 55 red maple trees (Acer rubrum), and 41 red oak trees (Quercus rubra) we investigated the impacts of heat stress and water stress on the radial growth of individual trees. Across our three-city study, we found that tree growth was more closely correlated with climate stress in the cooler climate cities of Boston and New York than in Baltimore. Furthermore, heat stress was a significant hindrance to tree growth in higher latitudes while the impacts of water stress appeared to be more evenly distributed across latitudes. We also found that the growth of oak trees, but not red maple trees, in the urban sites of Boston and New York City was more adversely impacted by heat stress than their rural counterparts, but we did not see these urban-rural differences in Maryland. Trees provide a wide range of important ecosystem services and increasing tree canopy cover was typically an important component of urban sustainability strategies. In light of our findings that urbanization can influence how tree growth responds to a warming climate, we suggest that municipalities consider these interactions when developing their tree-planting palettes and when estimating the capacity of urban forests to contribute to broader sustainability goals in the future.
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Affiliation(s)
- Kayla Warner
- Environmental Sciences Initiative, CUNY Advanced Science Research Center, New York, New York, USA
- Department of Environmental Science, Barnard College, New York, New York, USA
| | - Nancy Falxa Sonti
- USDA Forest Service, Northern Research Station, Baltimore, Maryland, USA
| | - Elizabeth M Cook
- Department of Environmental Science, Barnard College, New York, New York, USA
| | - Richard A Hallett
- USDA Forest Service, Northern Research Station, Bayside, New York, USA
| | - Lucy R Hutyra
- Department of Earth and Environment, Boston University, Boston, Massachusetts, USA
| | - Andrew B Reinmann
- Environmental Sciences Initiative, CUNY Advanced Science Research Center, New York, New York, USA
- Department of Geography and Environmental Science, Hunter College, New York, New York, USA
- Institute for Sustainable Cities, Hunter College, New York, New York, USA
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2
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Zhao H, Mailloux BJ, Cook EM, Culligan PJ. Change of urban park usage as a response to the COVID-19 global pandemic. Sci Rep 2023; 13:19324. [PMID: 37935778 PMCID: PMC10630328 DOI: 10.1038/s41598-023-46745-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 11/04/2023] [Indexed: 11/09/2023] Open
Abstract
Urban parks became critical for maintaining the well-being of urban residents during the COVID-19 global pandemic. To examine the impact of COVID-19 on urban park usage, we selected New York City (NYC) and used SafeGraph mobility data, which was collected from a large sample of mobile phone users, to assess the change in park visits and travel distance to a park based on 1) park type, 2) the income level of the visitor census block group (visitor CBG) and 3) that of the park census block group (park CBG). All analyses were adjusted for the impact of temperature on park visitation, and we focused primarily on visits made by NYC residents. Overall, for the eight most popular park types in NYC, visits dropped by 49.2% from 2019 to 2020. The peak reduction in visits occurred in April 2020. Visits to all park types, excluding Nature Areas, decreased from March to December 2020 as compared to 2019. Parks located in higher-income CBGs tended to have lower reductions in visits, with this pattern being primarily driven by large parks, including Flagship Parks, Community Parks and Nature Areas. All types of parks saw significant decreases in distance traveled to visit them, with the exception of the Jointly Operated Playground, Playground, and Nature Area park types. Visitors originating from lower-income CBGs traveled shorter distances to parks and had less reduction in travel distances compared to those from higher-income CBGs. Furthermore, both before and during the pandemic, people tended to travel a greater distance to parks located in high-income CBGs compared to those in low-income CBGs. Finally, multiple types of parks proved crucial destinations for NYC residents during the pandemic. This included Nature Areas to which the visits remained stable, along with Recreation Field/Courts which had relatively small decreases in visits, especially for lower-income communities. Results from this study can support future park planning by shedding light on the different uses of certain park types before and during a global crisis, when access to these facilities can help alleviate the human well-being consequences of "lockdown" policies.
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Affiliation(s)
- Haokai Zhao
- Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, 10027, USA
| | - Brian J Mailloux
- Department of Environmental Science, Barnard College, New York, NY, 10027, USA
| | - Elizabeth M Cook
- Department of Environmental Science, Barnard College, New York, NY, 10027, USA
| | - Patricia J Culligan
- College of Engineering, Univerisity of Notre Dame, Notre Dame, IN, 46556, USA.
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3
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Wheeler MM, Larson KL, Cook EM, Hall SJ. Residents manage dynamic plant communities: Change over time in urban vegetation. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.944803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
IntroductionIntegrated social and ecological processes shape urban plant communities, but the temporal dynamics and potential for change in these managed communities have rarely been explored. In residential yards, which cover about 40% of urban land area, individuals make decisions that control vegetation outcomes. These decisions may lead to relatively static plant composition and structure, as residents seek to expend little effort to maintain stable landscapes. Alternatively, residents may actively modify plant communities to meet their preferences or address perceived problems, or they may passively allow them to change. In this research, we ask, how and to what extent does residential yard vegetation change over time?MethodsWe conducted co-located ecological surveys of yards (in 2008, 2018, and 2019) and social surveys of residents (in 2018) in four diverse neighborhoods of Phoenix, Arizona.Results94% of residents had made some changes to their front or back yards since moving in. On average, about 60% of woody vegetation per yard changed between 2008 and 2018, though the number of species present did not differ significantly. In comparison, about 30% of woody vegetation changed in native Sonoran Desert reference areas over 10 years. In yards, about 15% of woody vegetation changed on average in a single year, with up to 90% change in some yards. Greater turnover was observed for homes that were sold, indicating a “pulse” of management. Additionally, we observed greater vegetation turnover in the two older, lawn-dominated neighborhoods surveyed despite differences in neighborhood socioeconomic factors.DiscussionThese results indicate that residential plant communities are dynamic over time. Neighborhood age and other characteristics may be important drivers of change, while socioeconomic status neither promotes nor inhibits change at the neighborhood scale. Our findings highlight an opportunity for management interventions, wherein residents may be open to making conservation-friendly changes if they are already altering the composition of their yards.
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Mejía GA, Groffman PM, Downey AE, Cook EM, Sritrairat S, Karty R, Palmer MI, McPhearson T. Nitrogen cycling and urban afforestation success in New York City. Ecol Appl 2022; 32:e2535. [PMID: 35044032 DOI: 10.1002/eap.2535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 01/05/2021] [Revised: 08/03/2021] [Accepted: 09/01/2021] [Indexed: 06/14/2023]
Abstract
Afforestation projects are a growing focus of urban restoration efforts to rehabilitate degraded landscapes and develop new forests. Urban forests provide myriad valuable ecosystem services essential for urban sustainability and resilience. These essential services are supported by natural soil microbial processes that transform organic matter to critical nutrients for plant community establishment and development. Nitrogen (N) is the most limiting nutrient in forest ecosystems, yet little information is known about N cycling in urban afforestation efforts. This study examined microbially mediated processes of carbon (C) and N cycling in 10 experimental afforested sites established across New York City parklands under the MillionTreesNYC initiative. Long-term research plots were established between 2009 and 2011 at each site with low and high diversity (two vs. six tree species) treatments. In 2018, 1-m soil cores were collected from plots at each site and analyzed for microbial biomass and respiration, potential net N mineralization, and nitrification, denitrification potential, soil inorganic N, and total soil N. Field observations revealed markedly different trajectories between sites that exhibited a closed canopy and leaf litter layer derived from trees that were planted and those that did not fit this description. These two metrics served to group sites into two categories (high vs. low) of afforestation success. We hypothesized that: (1) afforestation success would be correlated with rates of C and N cycling, (2) high diversity restoration techniques would affect these processes, and (3) inherent soil properties interact with plants and environmental conditions to affect the development of these processes over time. We found that high success sites had significantly higher rates of C and N cycling processes, but low and high diversity treatments showed no differences. Low success sites were more likely to have disturbed soil profiles with human-derived debris. Afforestation success appears to be driven by interactions between initial site conditions that facilitate plant community establishment and development that in turn enable N accumulation and cycling, creating positive feedbacks for success.
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Affiliation(s)
- Gisselle A Mejía
- Department of Earth and Environmental Sciences, CUNY-The Graduate Center, New York, New York, USA
- Advanced Science Research Center, CUNY-The Graduate Center, New York, New York, USA
| | - Peter M Groffman
- Department of Earth and Environmental Sciences, CUNY-The Graduate Center, New York, New York, USA
- Advanced Science Research Center, CUNY-The Graduate Center, New York, New York, USA
- Department of Earth and Environmental Sciences, CUNY-Brooklyn College, Brooklyn, New York, USA
- Cary Institute of Ecosystem Studies, Millbrook, New York, USA
| | - Alisen E Downey
- Department of Earth and Environmental Sciences, CUNY-Brooklyn College, Brooklyn, New York, USA
| | - Elizabeth M Cook
- Department of Environmental Science, Barnard College, New York, New York, USA
- Urban Systems Laboratory, The New School, New York, New York, USA
| | | | - Richard Karty
- Urban Systems Laboratory, The New School, New York, New York, USA
- Bund für Umwelt und Naturschutz Deutschland / Friends of the Earth, Berlin, Germany
| | - Matthew I Palmer
- Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, New York, USA
| | - Timon McPhearson
- Cary Institute of Ecosystem Studies, Millbrook, New York, USA
- Department of Environmental Science, Barnard College, New York, New York, USA
- Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden
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Iwaniec DM, Gooseff M, Suding KN, Samuel Johnson D, Reed DC, Peters DPC, Adams B, Barrett JE, Bestelmeyer BT, Castorani MCN, Cook EM, Davidson MJ, Groffman PM, Hanan NP, Huenneke LF, Johnson PTJ, McKnight DM, Miller RJ, Okin GS, Preston DL, Rassweiler A, Ray C, Sala OE, Schooley RL, Seastedt T, Spasojevic MJ, Vivoni ER. Connectivity: insights from the U.S. Long Term Ecological Research Network. Ecosphere 2021. [DOI: 10.1002/ecs2.3432] [Citation(s) in RCA: 4] [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: 01/12/2023] Open
Affiliation(s)
- David M. Iwaniec
- Urban Studies Institute Andrew Young School of Policy Studies Georgia State University Atlanta Georgia30303USA
| | - Michael Gooseff
- Institute of Arctic and Alpine Research University of Colorado Boulder Colorado80309USA
| | - Katharine N. Suding
- Institute of Arctic and Alpine Research University of Colorado Boulder Colorado80309USA
| | - David Samuel Johnson
- Virginia Institute of Marine Science William & Mary Gloucester Point Virginia23062USA
| | - Daniel C. Reed
- Marine Science Institute University of California Santa Barbara California93106USA
| | - Debra P. C. Peters
- US Department of Agriculture Agricultural Research Service Jornada Experimental Range Unit Las Cruces New Mexico88003‐0003USA
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
| | - Byron Adams
- Department of Biology and Monte L. Bean Museum Brigham Young University Provo Utah84602USA
| | - John E. Barrett
- Department of Biological Sciences Virginia Tech University Blacksburg Virginia24061USA
| | - Brandon T. Bestelmeyer
- US Department of Agriculture Agricultural Research Service Jornada Experimental Range Unit Las Cruces New Mexico88003‐0003USA
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
| | - Max C. N. Castorani
- Department of Environmental Sciences University of Virginia Charlottesville Virginia22904USA
| | - Elizabeth M. Cook
- Environmental Sciences Department Barnard College New York New York10027USA
| | - Melissa J. Davidson
- School Sustainability and Julie Ann Wrigley Global Institute of Sustainability Arizona State University Tempe Arizona85287USA
| | - Peter M. Groffman
- City University of New York Advanced Science Research Center at the Graduate Center New York New York10031USA
- Cary Institute of Ecosystem Studies Millbrook New York12545USA
| | - Niall P. Hanan
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- Department of Plant and Environmental Sciences New Mexico State University Las Cruces New Mexico88003USA
| | - Laura F. Huenneke
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- School of Earth and Sustainability Northern Arizona University Flagstaff Arizona86011USA
| | - Pieter T. J. Johnson
- Department of Ecology and Evolutionary Biology University of Colorado Boulder Colorado80309USA
| | - Diane M. McKnight
- Civil, Environmental and Architectural Engineering University of Colorado Boulder Colorado80309USA
| | - Robert J. Miller
- Marine Science Institute University of California Santa Barbara California93106USA
| | - Gregory S. Okin
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- Department of Geography University of California Los Angeles California90095USA
| | - Daniel L. Preston
- Department of Fish, Wildlife, and Conservation Biology Colorado State University Fort Collins Colorado80523USA
| | - Andrew Rassweiler
- Department of Biological Science Florida State University Tallahassee Florida32304USA
| | - Chris Ray
- Institute of Arctic and Alpine Research University of Colorado Boulder Colorado80309USA
| | - Osvaldo E. Sala
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- Global Drylands Center School of Life Sciences and School of Sustainability Arizona State University Tempe Arizona85287USA
| | - Robert L. Schooley
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- Department of Natural Resources and Environmental Sciences University of Illinois Urbana Illinois61801USA
| | - Timothy Seastedt
- Institute of Arctic and Alpine Research University of Colorado Boulder Colorado80309USA
| | - Marko J. Spasojevic
- Department of Evolution, Ecology, and Organismal Biology University of California Riverside Riverside California92521USA
| | - Enrique R. Vivoni
- Jornada Basin Long Term Ecological Research Program New Mexico State University Las Cruces New Mexico88003USA
- School of Earth and Space Exploration and School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona85287USA
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6
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Wheeler MM, Collins SL, Grimm NB, Cook EM, Clark C, Sponseller RA, Hall SJ. Water and nitrogen shape winter annual plant diversity and community composition in near‐urban Sonoran Desert preserves. ECOL MONOGR 2021; 91:1-19. [DOI: 10.1002/ecm.1450] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Megan M. Wheeler
- School of Life Sciences Arizona State University P.O. Box 874501 Tempe Arizona 85287‐4501 USA
| | - Scott L. Collins
- Department of Biology University of New Mexico 1 University of New Mexico MSC03 2020 Albuquerque New Mexico 87131‐0001 USA
| | - Nancy B. Grimm
- School of Life Sciences Arizona State University P.O. Box 874501 Tempe Arizona 85287‐4501 USA
| | - Elizabeth M. Cook
- Department of Environmental Science Barnard College 3009 Broadway New York City New York 10027 USA
| | - Christopher Clark
- U.S. Environmental Protection Agency Office of Research and Development 1200 Pennsylvania Avenue Washington D.C. 20004 USA
| | - Ryan A. Sponseller
- Department of Ecology and Environmental Sciences Umeå University SE‐ 901 87 Umeå Sweden
| | - Sharon J. Hall
- School of Life Sciences Arizona State University P.O. Box 874501 Tempe Arizona 85287‐4501 USA
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7
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Cook EM, Sponseller R, Grimm NB, Hall SJ. Mixed method approach to assess atmospheric nitrogen deposition in arid and semi-arid ecosystems. Environ Pollut 2018; 239:617-630. [PMID: 29705717 DOI: 10.1016/j.envpol.2018.04.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 03/12/2018] [Accepted: 04/03/2018] [Indexed: 06/08/2023]
Abstract
Arid and semi-arid ecosystems (aridlands) cover a third of Earth's terrestrial surface and contain organisms that are sensitive to low level atmospheric pollutants. Atmospheric nitrogen (N) inputs to aridlands are likely to cause changes in plant community composition, fire frequency, and carbon cycling and storage. However, few studies have documented long-term rates of atmospheric N inputs in aridlands because dry deposition is technically difficult to quantify, and extensive sampling is needed to capture fluxes with spatially and temporally heterogeneous rainfall patterns. Here, we quantified long-term spatial and temporal patterns of inorganic N deposition in protected aridland ecosystems across an extensive urban-rural gradient using multiple sampling methods. We compared long-term rates of N deposition from ion-exchange resin (IER) collectors (bulk and throughfall, 2006-2015), wet-dry bucket collectors (2006-2015), and dry deposition from the inferential method using passive samplers (2010-2012). From mixed approaches with IER collectors and inferential methods, we determined that 7.2 ± 0.4 kgNha-1y-1 is deposited to protected Sonoran Desert within metropolitan Phoenix, Arizona and 6.1 ± 0.3 kgNha-1y-1 in nearby desert ecosystems. Regional scale models overestimated deposition rates for our sampling period by 60% and misidentified hot spots of deposition across the airshed. By contrast, the easy-deployment IER throughfall collectors showed minimal spatial variation across the urban-rural gradient and underestimated deposition fluxes by 54%, largely because of underestimated dry deposition in throughfall. However, seasonal sampling of the IER collectors over 10 years allowed us to capture significant seasonal variation in N deposition and the importance of precipitation timing. These results, derived from the longest, spatially and temporally explicit dataset in drylands, highlight the need for long-term, mixed methods to estimate atmospheric nutrient enrichment to aridlands in a rapidly changing world.
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Affiliation(s)
- Elizabeth M Cook
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA.
| | - Ryan Sponseller
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
| | - Nancy B Grimm
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA; Julie Ann Wrigley Global Institute of Sustainability, Arizona State University, Tempe, AZ, 85287, USA
| | - Sharon J Hall
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA; Julie Ann Wrigley Global Institute of Sustainability, Arizona State University, Tempe, AZ, 85287, USA
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8
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Denk S, Taylor RP, Wiegner R, Cook EM, Lindorfer MA, Pfeiffer K, Paschke S, Eiseler T, Weiss M, Barth E, Lambris JD, Kalbitz M, Martin T, Barth H, Messerer DAC, Gebhard F, Huber-Lang MS. Complement C5a-Induced Changes in Neutrophil Morphology During Inflammation. Scand J Immunol 2017; 86:143-155. [PMID: 28671713 DOI: 10.1111/sji.12580] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 06/26/2017] [Indexed: 12/20/2022]
Abstract
The complement and neutrophil defence systems, as major components of innate immunity, are activated during inflammation and infection. For neutrophil migration to the inflamed region, we hypothesized that the complement activation product C5a induces significant changes in cellular morphology before chemotaxis. Exposure of human neutrophils to C5a dose- and time-dependently resulted in a rapid C5a receptor-1 (C5aR1)-dependent shape change, indicated by enhanced flow cytometric forward-scatter area values. Similar changes were observed after incubation with zymosan-activated serum and in blood neutrophils during murine sepsis, but not in mice lacking the C5aR1. In human neutrophils, Amnis high-resolution digital imaging revealed a C5a-induced decrease in circularity and increase in the cellular length/width ratio. Biomechanically, microfluidic optical stretching experiments indicated significantly increased neutrophil deformability early after C5a stimulation. The C5a-induced shape changes were inhibited by pharmacological blockade of either the Cl-/HCO3--exchanger or the Cl- -channel. Furthermore, actin polymerization assays revealed that C5a exposure resulted in a significant polarization of the neutrophils. The functional polarization process triggered by ATP-P2X/Y-purinoceptor interaction was also involved in the C5a-induced shape changes, because pretreatment with suramin blocked not only the shape changes but also the subsequent C5a-dependent chemotactic activity. In conclusion, the data suggest that the anaphylatoxin C5a regulates basic neutrophil cell processes by increasing the membrane elasticity and cell size as a consequence of actin-cytoskeleton polymerization and reorganization, transforming the neutrophil into a migratory cell able to invade the inflammatory site and subsequently clear pathogens and molecular debris.
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Affiliation(s)
- S Denk
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital Ulm, Ulm, Germany
| | - R P Taylor
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - R Wiegner
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital Ulm, Ulm, Germany
| | - E M Cook
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - M A Lindorfer
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - K Pfeiffer
- Department of General and Visceral Surgery, Ulm University, Ulm, Germany
| | - S Paschke
- Department of General and Visceral Surgery, Ulm University, Ulm, Germany
| | - T Eiseler
- Department of Internal Medicine I, Ulm University, Ulm, Germany
| | - M Weiss
- Department of Anesthesiology, University Hospital Ulm, Ulm, Germany
| | - E Barth
- Department of Anesthesiology, University Hospital Ulm, Ulm, Germany
| | - J D Lambris
- Department of Pathology, University of Pennsylvania, Philadelphia, PA, USA
| | - M Kalbitz
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, University Hospital Ulm, Ulm, Germany
| | - T Martin
- Institute of Pharmacology and Toxicology, University Hospital Ulm, Ulm, Germany
| | - H Barth
- Institute of Pharmacology and Toxicology, University Hospital Ulm, Ulm, Germany
| | - D A C Messerer
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital Ulm, Ulm, Germany
| | - F Gebhard
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, University Hospital Ulm, Ulm, Germany
| | - M S Huber-Lang
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital Ulm, Ulm, Germany
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9
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Metson GS, Hale RL, Iwaniec DM, Cook EM, Corman JR, Galletti CS, Childers DL. Phosphorus in Phoenix: a budget and spatial representation of phosphorus in an urban ecosystem. Ecol Appl 2012; 22:705-721. [PMID: 22611866 DOI: 10.1890/11-0865.1] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
As urban environments dominate the landscape, we need to examine how limiting nutrients such as phosphorus (P) cycle in these novel ecosystems. Sustainable management of P resources is necessary to ensure global food security and to minimize freshwater pollution. We used a spatially explicit budget to quantify the pools and fluxes of P in the Greater Phoenix Area in Arizona, USA, using the boundaries of the Central Arizona-Phoenix Long-Term Ecological Research site. Inputs were dominated by direct imports of food and fertilizer for local agriculture, while most outputs were small, including water, crops, and material destined for recycling. Internally, fluxes were dominated by transfers of food and feed from local agriculture and the recycling of human and animal excretion. Spatial correction of P dynamics across the city showed that human density and associated infrastructure, especially asphalt, dominated the distribution of P pools across the landscape. Phosphorus fluxes were dominated by agricultural production, with agricultural soils accumulating P. Human features (infrastructure, technology, and waste management decisions) and biophysical characteristics (soil properties, water fluxes, and storage) mediated P dynamics in Phoenix. P cycling was most notably affected by water management practices that conserve and recycle water, preventing the loss of waterborne P from the ecosystem. P is not intentionally managed, and as a result, changes in land use and demographics, particularly increased urbanization and declining agriculture, may lead to increased losses of P from this system. We suggest that city managers should minimize cross-boundary fluxes of P to the city. Reduced P fluxes may be accomplished through more efficient recycling of waste, therefore decreasing dependence on external nonrenewable P resources and minimizing aquatic pollution. Our spatial approach and consideration of both pools and fluxes across a heterogeneous urban ecosystem increases the utility of nutrient budgets for city managers. Our budget explicitly links processes that affect P cycling across space with the management of other resources (e.g., water). A holistic management strategy that deliberately couples the management of P and other resources should be a priority for cities in achieving urban sustainability.
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Affiliation(s)
- Geneviève S Metson
- School of Sustainability, Arizona State University, Tempe, Arizona 85287-5502, USA.
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10
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Davis WR, Tomsho J, Nikam S, Cook EM, Somand D, Peliska JA. Inhibition of HIV-1 reverse transcriptase-catalyzed DNA strand transfer reactions by 4-chlorophenylhydrazone of mesoxalic acid. Biochemistry 2000; 39:14279-91. [PMID: 11087377 DOI: 10.1021/bi0015764] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
DNA strand transfer reactions occur twice during retroviral reverse transcription catalyzed by HIV-1 reverse transcriptase. The 4-chlorophenylhydrazone of mesoxalic acid (CPHM) was found to be an inhibitor of DNA strand transfer reactions catalyzed by HIV-1 reverse transcriptase. Using a model strand transfer assay system described previously [Davis, W. R., et al. (1998) Biochemistry 37, 14213-14221], the mechanism of CPHM inhibition of DNA strand transfer has been characterized. CPHM was found to target the RNase H activity of HIV-1 reverse transcriptase. DNA polymerase activity was not significantly affected by CPHM; however, it did inhibit the polymerase-independent RNase H activity with an IC(50) of 2.2 microM. In the absence of DNA synthesis, CPHM appears to interfere with the translocation, or repositioning, of RT on the RNA.DNA template duplex, a step required for efficient RNA hydrolysis by RNase H. Enzyme inhibition by CPHM was found to be highly specific for HIV-1 reverse transcriptase; little or no inhibition of DNA strand transfer or DNA polymerase activity was observed with MLV or AMV reverse transcriptase, T7 DNA polymerase, or DNA polymerase I. Examination of additional 4-chlorophenylhydrazones showed that the dicarboxylic acid moiety of CPHM is essential for activity, suggesting its important role for enzyme binding. Consistent with the role of the dicarboxylic acid in inhibitor function, Mg(2+) was found to chelate directly to CPHM with a K(d) of 2.4 mM. Together, these studies suggest that the inhibitor may function by binding to enzyme-bound divalent metal cofactors.
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Affiliation(s)
- W R Davis
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, Michigan 48109-0606, USA
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