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Dataset: Ribbed Mussel Carbon And Nitrogen Composition Data, Robert Isdell, Ashley Rose, Donna Marie Bilkovic, Randolph Chambers
Dataset: Ribbed Mussel Carbon And Nitrogen Composition Data, Robert Isdell, Ashley Rose, Donna Marie Bilkovic, Randolph Chambers
Data
Ribbed mussel (Geukensia demissa) C:N ratios for tissue and shell samples are provided from a marsh in Virginia
Investigating The Effects Of Nitrogen Deposition And Substrates On The Microbiome And Mycobiome Of The Millipede Cherokia Georgiana Georgiana (Diplopoda: Polydesmida), Shawn P. Brown, Matthew Brogden, Christina Cortes, Avery E. Tucker, Allison Rick Vandevoort, Bruce A. Snyder
Investigating The Effects Of Nitrogen Deposition And Substrates On The Microbiome And Mycobiome Of The Millipede Cherokia Georgiana Georgiana (Diplopoda: Polydesmida), Shawn P. Brown, Matthew Brogden, Christina Cortes, Avery E. Tucker, Allison Rick Vandevoort, Bruce A. Snyder
Faculty and Staff Works
Millipedes are ubiquitous soil invertebrates that play major roles in physical and chemical processes in soil. Despite their importance to soil ecology and their presumed interactions with soil microorganisms, little is known about how millipedes influence and are influenced by soil microbes. Furthermore, it is not fully understood how these millipede-microbe interactions are influenced by available soil nitrogen, which is predicted to increase over the foreseeable future with increased anthropogenic production. Here, using the millipede Cherokia georgiana georgiana as a model and using a manipulative mesocosm and metabarcoding approach, we examine (1) the impacts of millipedes on soil microbial communities …
Dataset On Soil Physio-Chemical Properties And Seasonal Moisture And Nutrient Dynamics In Temporary Stream Channels And Contributing Uplands In Arizona, Usa, Kathleen A. Lohse, Erika L. Gallo, Thomas Meixner
Dataset On Soil Physio-Chemical Properties And Seasonal Moisture And Nutrient Dynamics In Temporary Stream Channels And Contributing Uplands In Arizona, Usa, Kathleen A. Lohse, Erika L. Gallo, Thomas Meixner
Reynolds Creek Critical Zone Observatory Data
Ephemeral and intermittent streams are increasing with climate and land use changes, and alteration in stream water presence or flow duration will likely affect soil nutrient dynamics in channel and riparian zones more than dryland uplands. To investigate the influence of varying climate and stream flow regimes on associated soil nutrient dynamics, we monitored soil moisture and nutrient dynamics over an 18-month period across a range of ephemeral to seasonally- intermittent stream reaches (13) and landscape positions (channel, riparian, upland) in Arizona, USA. The monitoring reaches were located in largely undisturbed military facilities, long term ecological research areas and a …
Stream Drying And Wildfire Recovery Surface Water Chemistry 2016 Dataset: Temporally Repeated High Spatial Scope Sampling For Intermittent Streams Johnston Draw Creek And Murphy Creek At Reynolds Creek Critical Zone Observatory (Rc Czo), Ruth B. Macneille, Kathleen A. Lohse, Julia N. Prediral, Sarah E. Godsey, Colden V. Baxter, Mark S. Seyfried
Stream Drying And Wildfire Recovery Surface Water Chemistry 2016 Dataset: Temporally Repeated High Spatial Scope Sampling For Intermittent Streams Johnston Draw Creek And Murphy Creek At Reynolds Creek Critical Zone Observatory (Rc Czo), Ruth B. Macneille, Kathleen A. Lohse, Julia N. Prediral, Sarah E. Godsey, Colden V. Baxter, Mark S. Seyfried
Reynolds Creek Critical Zone Observatory Data
Stream drying and wildfire are projected to increase with climate change in the western United States, and both are likely to influence the patterns and processes explaining stream chemistry. To investigate drying and wildfire effects on stream chemistry (carbon, nutrients, anions, cations, and isotopes), we examined seasonal drying in two intermittent streams in southwestern Idaho, one stream that was unburned and one that burned six months prior. We hypothesized that spatiotemporal patterns of stream chemistry would change due to increased evaporation, groundwater dominance, and autochthonous carbon production as water and carbon sources shifted from snowmelt to low flow conditions. With …
The Modern Methods Of Using Alternative Energy Sources, U. Mirzayev, J. T. Tulakov Jakhongir Turakul Ugl
The Modern Methods Of Using Alternative Energy Sources, U. Mirzayev, J. T. Tulakov Jakhongir Turakul Ugl
Central Asian Problems of Modern Science and Education
At present, much attention is paid to the use of solar energy. Solar energy, in addition to traditional energy, is ecologically clean while changing. The rarity and the rising cost of fuel is one of the main problems of the scientific technique, which is the acquisition of infinite resources of solar energy. Further research and experiments on the use of solar energy, as well as the use of solar power plants in a number of countries, shows that solar energy can be widely used today based on modern technical capacities
Stable Isotope Data From Reef Fish Collected At Natural Reefs Sites In The Northern Gulf Of Mexico From 2015-08-30 To 2015-11-03, Miaya Glabach
Stable Isotope Data From Reef Fish Collected At Natural Reefs Sites In The Northern Gulf Of Mexico From 2015-08-30 To 2015-11-03, Miaya Glabach
C-IMAGE data
Reef fish were collected at natural reef sites in the northern Gulf of Mexico from August 30, 2015, through November 3, 2015. White muscle tissue samples from fish were used to perform stable isotope analysis to examine reef fish trophic ecology.
Investigation Of The Effects Of Mineral Fertilizers (Nitrogen) On The Development Of Mulberry Trees Growing And Productivity Of Their Leaves., M Ibragimov
Karakalpak Scientific Journal
The article is devoted to the study of influence of mineral fertilizers (nitric) on development and productivity mulberry leaves. It is the experimentally proved positive influence on growth and productivity of a mulberry.
Stable Isotope Analysis Of North Central Gulf Of Mexico Demersal Shelf Fishes, June 2015 - August 2016, William Patterson, Kristen Dahl
Stable Isotope Analysis Of North Central Gulf Of Mexico Demersal Shelf Fishes, June 2015 - August 2016, William Patterson, Kristen Dahl
C-IMAGE data
Stable isotopes of carbon, nitrogen and sulfur were analyzed for demersal reef fishes (n=743) collected in the north central Gulf of Mexico between June 2015 and August 2016.
Flue-Gas Desulfurization Gypsum Effects On Urea-Degrading Bacteria And Ammonia Volatilization From Broiler Litter, Christopher D. Burt, Miguel L. Cabrera, Michael J. Rothrock, D. E. Kissel
Flue-Gas Desulfurization Gypsum Effects On Urea-Degrading Bacteria And Ammonia Volatilization From Broiler Litter, Christopher D. Burt, Miguel L. Cabrera, Michael J. Rothrock, D. E. Kissel
Faculty and Staff Works
A major concern of the broiler industry is the volatilization of ammonia (NH3) from the mixture of bedding material and broiler excretion that covers the floor of broiler houses. Gypsum has been proposed as a litter amendment to reduce NH3 volatilization, but reports of NH3 abatement vary among studies and the mechanism responsible for decreasing NH3 volatilization is not well understood. The goal of this study was to evaluate the effect of adding 20 or 40% flue-gas desulfurization gypsum (FGDG) to broiler litter on pH, electrical conductivity (EC), water potential, urea-degrading bacteria abundance, NH3 and carbon dioxide (CO2) evolution, and …
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Nitrogen Data From The Sevilleta National Wildlife Refuge, New Mexico (2006 - Present), Scott Collins, William Pockman
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Nitrogen Data From The Sevilleta National Wildlife Refuge, New Mexico (2006 - Present), Scott Collins, William Pockman
Sevilleta LTER Program Data
Humans are creating significant global environmental change, including shifts in climate, increased nitrogen (N) deposition, and the facilitation of species invasions. A multi-factorial field experiment is being performed in an arid grassland within the Sevilleta National Wildlife Refuge (NWR) to simulate increased nighttime temperature, higher N deposition, and heightened El Niño frequency (which increases winter precipitation by an average of 50%). The purpose of the experiment is to better understand the potential effects of environmental drivers on grassland community composition, aboveground net primary production and soil respiration. The focus is on the response of two dominant grasses (Bouteloua gracilis and …
Long-Term Dynamics In Soil Field Available Nitrogen And Potentially Mineralizable Nitrogen In A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (1989-2014), Carleton White, Douglas I. Moore
Long-Term Dynamics In Soil Field Available Nitrogen And Potentially Mineralizable Nitrogen In A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (1989-2014), Carleton White, Douglas I. Moore
Sevilleta LTER Program Data
Associated with a project that was based upon the assumption that nitrogen may limit net primary plant production in desert grasslands, this project began measuring available inorganic soil N and potentially mineralizable N of soils at two desert grassland locations. Both available N and potentially mineralizable N were greatest following a drought period in 1989, declined during wetter periods that followed and remained relatively stable until another extended drought period. After drought in 1995-6, both forms of soil N increased, indicating the potential for greater NPP following drought and lower potential NPP during periods of normal precipitation.
Sevilleta Lter Vegetation Sample Catalog- Ground Samples For Chemical Analysis (2000-Present), Douglas I. Moore, Stephanie Baker
Sevilleta Lter Vegetation Sample Catalog- Ground Samples For Chemical Analysis (2000-Present), Douglas I. Moore, Stephanie Baker
Sevilleta LTER Program Data
Several long-term studies at the Sevilleta LTER measure net primary production (NPP) across ecosystems and treatments. Net primary production is a fundamental ecological variable that quantifies rates of carbon consumption and fixation. Estimates of NPP are important in understanding energy flow at a community level as well as spatial and temporal responses to a range of ecological processes. The NPP weight data (SEV 157) is obtained by harvesting a series of covers for species observed during plot sampling. These species are always harvested from habitat comparable to the plots in which they were recorded. This data is then used to …
Soil Nutrient Distributions In Chihuahuan Desert Grasslands And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (1989), Anne Cross
Sevilleta LTER Program Data
Vegetation throughout the southwestern United States has changed from perennial grassland to woody shrubland over the past century. Previous studies on the development of 'islands of fertility' focused primarily on only the most limiting, plant-essential element, soil nitrogen (N). The research presented here addressed the question of whether other plant-essential elements, namely phosphorus (P) and potassium (K), showed similar concentration gradients under the desert shrub Larrea tridentata (creosotebush). It also examined whether the spatial distribution of N, P, and K differed from that of essential, but non-limiting nutrients, namely calcium (Ca), magnesium (Mg), and sulfur (S), and non-essential elements, namely …
15n Tracer Study In Grassland And Shrubland At The Sevilleta National Wildlife Refuge, New Mexico (1989-2002), Anne Cross
Sevilleta LTER Program Data
Because grasses and shrubs may induce different spatial distributions of nutrients in desert soils, this study was initiated to examine the redistribution of nitrogen in grassland and shrubland soils over a long time period. The stable isotope N15 was applied to plots in grassland and shrubland, and the plots were measured annually from 1989-1993 and again in 1999, 2001, and 2002.
2010 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2010 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2010.
Effect Of Long-Term Nitrogen Fertilization On Mycorrhizal Fungi Associated With A Dominant Grass In A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (2005), Andrea Porras-Alfaro, Robert Sinsabaugh, Don Natvig
Effect Of Long-Term Nitrogen Fertilization On Mycorrhizal Fungi Associated With A Dominant Grass In A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (2005), Andrea Porras-Alfaro, Robert Sinsabaugh, Don Natvig
Sevilleta LTER Program Data
We studied the diversity of arbuscular mycorrhizal fungi (AMF) in a semiarid grassland and the effect of long-term nitrogen (N) fertilization on this fungal community. Root samples of Bouteloua gracilis were collected at the Sevilleta National Wildlife Refuge (New Mexico, USA) from control and N-amended plots that have been fertilized since 1995. Small subunit rDNA was amplified using AMF specific primers NS31 and AM1. The diversity of AMF was low in comparison with other ecosystems, only seven operational taxonomic units (OTU) were found in B. gracilis and all belong to the genus Glomus. The dominant OTU was closely related to …
2010 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2010 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2010.
Implications Of On-Ground Nitrogen Loading And Soil Transformations On Ground Water Quality Management, M. Almasri, Jagath J. Kaluarachchi
Implications Of On-Ground Nitrogen Loading And Soil Transformations On Ground Water Quality Management, M. Almasri, Jagath J. Kaluarachchi
Civil and Environmental Engineering Faculty Publications
This paper presents a modeling approach based on a geographic information system (GIS) to estimate the variability of on-ground nitrogen loading and the corresponding nitrate leaching to ground water. The methodology integrates all point and nonpoint sources of nitrogen, the national land cover database, soil nitrogen transformations, and the uncertainty of key soil and land use-related parameters to predict the nitrate mass leaching to ground water. The analysis considered 21 different land use classes with information derived from nitrogen sources such as fertilizer and dairy manure applications, dairy lagoons, septic systems, and dry and wet depositions. Simulations were performed at …
2004 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2004 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2004.
2004 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2004 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2004.
2003 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2003 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2003.
2003 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2003 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2003.
2002 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2002 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2002.
2002 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2002 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2002.
2001 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2001 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2001.
2001 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2001 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2001.
2000 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
2000 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2000.
2000 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
2000 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 2000.
1999 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
1999 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 1999.
1999 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
1999 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 1999.