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  • 1
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10949 | 1256 | 2013-03-26 13:57:52 | 10949 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1992 produced by the National Rivers Authority (NRA) in 1994. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the fourth compilation of salmon and migratory trout catch statistics for England and Wales published by the National Rivers Authority. For the years 1983-88, these statistics were published by the Ministry of Agriculture, Fisheries and Food (MAFF), Directorate of Fisheries Research in their Data Report Series. Other than for rod catches, the 1992 data have been presented in a broadly similar format to those of 1991, Presentation of the rod data however has changed considerably due to the introduction in January 1992 of the first National Rod Fishing Licence. This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 51
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  • 2
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10950 | 1256 | 2013-03-26 13:57:26 | 10950 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1994 produced by the National Rivers Authority (NRA) in 1995. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the sixth compilation of salmon and migratory trout catch statistics for England and Wales produced by the National Rivers Authority. For the years 1983-88, these statistics were published by the Ministry o f Agriculture, Fisheries and Food (MAFF), Directorate of Fisheries Research in their Data Report Series. The 1994 data have been presented in a broadly similar format to those of 1993.This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 57
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  • 3
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    National Rivers Authority | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10961 | 1256 | 2013-03-26 13:55:26 | 10961 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the Acid waters in North West England: The effect of liming agricultural land on the chemistry and biology of the River Esk, North West England report produced by National Rivers Authority in 1992. This report focuses on the study of Acid Waters in the North West Region of England, UK, which began in 1982 and sampling was completed in October 1990. This work was initiated because of the observation of the simultaneous mortality of adult and juvenile salmon and sea-trout in both the River Esk and adjacent River Duddon in June 1980. Investigations at that time indicated that an "acid episode" was the most likely cause of this mortality. A land use study indicated that a reduction in agricultural liming may have been a major factor in the development of acid episodes and consequent fish kills in the River Esk and River Duddon. However there was no evidence that the mortalities of salmonids in the early 1980's were due to a reduction in agricultural liming. They were due to some other phenomenon such as a period of intense acid deposition.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: +appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; North West ; Esk ; Inland waters ; Rivers ; Freshwater pollution ; Freshwater fish ; Migratory species ; Fish counter data ; Mortalities ; Invertebrates ; Acid Waters ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 4
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11036 | 1256 | 2013-03-26 13:41:04 | 11036 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: This is the Wetland resource evaluation and the NRA's role in its conservation: Resource assessment report produced by the National Rivers Authority in 1995. This R&D document provides a strategy for the assessment of the wetland resource of England and Wales. As a first step the report defines wetlands in their UK context. The following working definition is suggested: Wetland is land that has (or had until modified) a water level predominantly at, near, or up to 1.5 m above the ground surface for sufficient time during the year to allow hydrological processes to be a major influence on the soils and biota. These processes may be expressed in certain features, such as characteristic soils and vegetation. The report also summarises a hydrotopographical classification of wetlands. The report then develops a strategy for the establishment of a wetland resource Inventory based on a geographical information system (GIS) as a means of storing and manipulating site data from across England and Wales.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; UK ; England ; Wales ; Inland waters ; Wetland ; GIS ; Resource ; Survey ; Classification ; Inventory ; Definition ; Hydrotopography
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 76
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  • 5
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11035 | 1256 | 2013-03-26 13:41:14 | 11035 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: This is the Wetland resource evaluation and the NRA's role in its conservation: Classification of British wetlands report produced by the National Rivers Authority in 1995. This R&D document provides a clear classification for wetlands in England and Wales. The classification incorporates many of the existing ideas on the subject but avoids some of the problems associated with other classifications. A two-layered 'hydrotopographical' classification is proposed. The first layer identifies situation-types, i.e. the position the wetland occupies in the landscape, with special emphasis upon the principal sources of water. The second layer identifies hydrotopographical elements, i.e. units with distinctive water supply and, sometimes, distinctive topography in response to this. This system is seen as an independent, basic, classification upon which it is possible to superimpose additional, independent classifications based on other features (e.g. base-status, fertility, vegetation, management etc.). Some proposals for such additional classifications are provided.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Inland waters ; Wetlands ; Resource ; Classification ; Key ; Hydrotopography ; Survey
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 106
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  • 6
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10876 | 1256 | 2013-03-26 13:49:07 | 10876 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-01
    Beschreibung: This is the River Dart, Spawning 1992 report produced by the National Rivers Authority. It contains details on the hydrological conditions and redd sighting locations on the River Dart, as well as kelts presence data. It also contains two basic diagrams showing the location of the sightings.
    Beschreibung: Environment Agency Archives South West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; South West ; River Dart ; River fisheries ; Freshwater fish ; Salmon fisheries ; Spawning ; Environmental monitoring ; Population dynamics.
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 4
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  • 7
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10909 | 1256 | 2013-03-21 13:05:20 | 10909 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-01
    Beschreibung: This is the Cheshire Meres 1995, May – June Surveys Report from the National Rivers Authority, 1995. The report focuses on the surveys of ten Cheshire Meres in November 1994 and then again in May-June 1995 as part of a rolling program examining the water quality of this group of still waters. The ten meres surveyed were: Betley, Budworth, Combermere, Hatchmere, Oak mere, Pick mere, Redes, Rostheme, Tabley, and Tatton. This report discusses the results of the May-June survey before making a comparison between these and the November survey results. The section on results contains information about suspended solids (S.S.) and volatile suspended solids (V.S.S.); Nitrate and Nitrite; Ammonia; ortho-Phosphate; Silicate and Soluble reactive Silica; and total Phosphorus.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Cheshire ; Environmental assessment ; Survey ; Eutrophication ; Inland waters ; Pollution ; Lakes classification
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 16
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  • 8
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10982 | 1256 | 2013-03-26 13:51:31 | 10982 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the report on Lakes – Classification and Monitoring, a strategy for the classification of lakes by the National Rivers Authority.This report describes a scheme for the assessment and monitoring of water and ecological quality in standing waters, greater than about 1ha in area, in England and Wales although it is generally relevant to Northwest Europe. Thirteen hydrological, chemical and biological variables are used to characterize the standing water body in any current sampling. Statistical testing on the chemical variables showed that at least six samples during a year would be needed to produce a representative sampling mean; but in this scheme the choice of variables minimizes logistic cost by not using boat sampling and time costs by not demanding extensive taxonomic work. Standing waters are classified in a state-changed system in which the contemporary values of the variables are compared with a reference baseline state and then placed in categories of percentage change from this baseline. The scheme is presently designed for use at about five year intervals on all lakes greater than 2ha area plus additional lakes of significant amenity or conservation interest.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Lake classification ; Monitoring ; Eutrophication ; Acidification ; Infilling ; Water quality ; Ecological quality ; State-changed schemes ; Export coefficient models ; Nutrients ; Aquatic plants
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 100
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  • 9
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10911 | 1256 | 2013-03-21 13:06:32 | 10911 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-02
    Beschreibung: This is the Cheshire stillwaters. Summary results of 1997 data Oak Mere, Betley Mere and Marbury Big from the National Rivers Authority, June 1998. In May 1997, a Stillwaters meeting was held to discuss the way forward in stillwaters monitoring. It decided upon the establishment of a three year rolling programme, in which three stillwaters would be monitored three times a year, every third year. The stillwaters where chosen due to water quality (i.e potential polluted / sensitive waters), fisheries and ecological interests. The Still waters chosen for the first year (1997) were Oak Mere, Betley Mere and Marbury Big Mere. The surveys were aimed to produce a comprehensive study of the still water through monitoring a variety of parameters. Algal, zooplankton and water chemical samples were taken three times a year, (April, July and September). In addition, fisheries surveys were taken in July and marginal invertebrate surveys taken in September.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Cheshire ; Environmental assessment ; Environmental monitoring ; Survey ; Eutrophication ; Inland waters ; Pollution ; Lakes classification ; Fisheries surveys
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 15
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  • 10
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8378 | 1256 | 2012-03-07 14:44:30 | 8378 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-02
    Beschreibung: The overall purpose of this guide is to provide a manualfor the collection and interpretation of sea trout scales. Abrief introduction considers the advantages anddisadvantages of using scales to determine age and growth.To ensure that scales are interpreted in a consistentmanner, all major terms are defined and a standard systemfor age notation is proposed. The methodology for thecollection, mounting and interpretation of scales isdescribed in detail, and this is followed by a section on the back-calculation of lengths at different ages. Each topic is discussed critically. The final part of this guide is an atlas illustrating scales from a wide range of sea trout and including not only excellent "type-scales" but also difficult and impossible scales.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Biology ; Fisheries ; Limnology ; Scales ; Tagging ; Salmo trutta ; Scale reading ; Age ; Animal morphology ; Length
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 63
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  • 11
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11029 | 1256 | 2013-03-26 13:42:10 | 11029
    Publikationsdatum: 2021-06-26
    Beschreibung: This is the River Gowy rapid corridor survey July 1995: Ecology South Mersey report produced by the National Rivers Authority North West Region in 1995. This report looks at the survey carried out by the South Mersey Ecology Team prior to routine deweeding operations on the main River Gowy at the end of July, 1995. The survey covered Flood Defence Stretch References RGOW03 to RGOW16. These stretches were further divided into a series of 43 stretches, each one being approximately 500m in length for ease o f mapping by Ecology. Recommendations for each length have been cross-referenced with the Bill of Quantities where possible, e.g. retention o f margins. In Flood Defence stretch RGOW03, the South West Winter Wetland forms an important habitat for birds. In stretches RGOW04 to RGOW05, the Gowy Meadows and Ditches have been designated a Grade A, Site of Biological Importance, by Cheshire County Council due to the nature of the acidic grassland and diverse ditches. In stretches RGOWIO to RGOW11 the left bank forms Hockenhull Platts, Grade A Site of Biological Importance and County Trust Reserve. In stretches RGOW15 to RGOW16, the area from Mill Farm to the Shropshire Union Canal is a Grade A Site of Biological Importance. These sites are very sensitive and detailed recommendations for working practices can be found in the relevant sections o f the survey.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: +appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Mersey ; River Gowy ; Inland waters ; Flood Defence stretch references ; Macrophytes ; Macroinvertebrates ; Freshwater fish ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 65
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  • 12
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11034 | 1256 | 2013-03-26 13:41:24 | 11034 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: This is the NRA's role in wetland conservation report produced by the National Rivers Authority in 1995. This document is the third of a series of three R&D Notes produced as part of an integrated research programme addressing aspects of the NRA's role in wetland management and conservation. Chapter 1 considers the nature of the wetland resource and its definition. Chapter 2 presents the NRA's current legislative and policy framework relating to its role in wetland conservation. National and international legislation and agreements are considered, and particular attention is afforded to the potential implications of the 'Habitats Directive'. Chapter 4 presents key examples of operational casework involving wetlands. Differences in approach and external perceptions of the NRA's current and likely future role in wetland conservation are discussed within Chapter 5. Other issues highlighted in this report are: policy guidance required on NRA’s role in land drainage; standard of flood defence service for wetlands; cost-benefit analysis; strategies for halting and reversing the decline and degradation of wetland resource; and Catchment Management Planning.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Inland waters ; Wetland definition ; Wetland management ; Wetland conservation ; Water management ; Legislation ; Policy ; Strategy ; Survey ; Restoration
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 114
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  • 13
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10875 | 1256 | 2013-03-26 13:50:15 | 10875 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-01
    Beschreibung: This is the River Dart, Weir and Fish Pass Survey 1992 report produced by the National Rivers Authority.It goes through the general condition of Weirs and fish passes to determine the extent of problems associated with the upstream and downstream migration of salmonids. It considers solutions where problems exist and investigates the exact use of the resource. It looks at the following Weirs: Totnes, Staverton, Hood, Kilbury, Buckfast, Holne, Mardle (River Mardle), Holybrook (Holybrook), Jordan (West Webburn), Swincombe Intake (River Swincombe), Blackbrook, West Dart, Cowsic (Devonport Leat), Kingfisher Press (Bidwell Brook) and Bagpark (East Webburn). It also contains location maps of the weirs and individual fact sheets along detailed pictures and diagrams.
    Beschreibung: Environment Agency Archives South West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; South West ; River Dart ; Rivers ; River fisheries ; Freshwater fish ; Migratory species ; Salmon fisheries ; Fishery surveys ; Fish passes ; Environmental assessment
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 57
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  • 14
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    National Rivers Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10919 | 1256 | 2013-03-26 13:59:17 | 10919 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-02
    Beschreibung: This is the Cheshire Meres 1994 November surveys report produced by the National Rivers Authority in 1995. The report focuses on some of Cheshire meres, which were showing evidence of increasing eutrophication, commonly due to anthropogenic inputs. Concern for the deterioration of the water quality of still waters has been translated by incorporating these priorities into the NRA North West Regional Environmental Strategy for Stillwaters. The meres were also being investigated as possible polluted waters under the EC Nitrate Directive.The ultimate aim is to formulate lakes management options in order to help preserve North West still waters and minimise future restoration programmes. For such pro-active work to be carried out, sufficient background data must be available. It should then be possible to fully assess the current status of these lakes, identify seasonal trends and detect significant point/diffuse pollution inputs. These surveys were the first of a series, and it was intended to repeat similar surveys in Summer and Autumn 1995, and include a further 20 meres.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Cheshire ; Environmental assessment ; Survey ; Eutrophication ; Inland waters ; Pollution ; Lakes classification ; Nitrate Directive ; Lakes management
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 5
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  • 15
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10938 | 1256 | 2013-03-26 13:59:55 | 10938 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-02
    Beschreibung: This is the Species management in aquatic Habitats WRc Nov 1993 produced by the National Rivers Authority (NRA) in 1993. This report identified key rare and nuisance species of interest to the NRA and prioritised research needs to develop conservation strategies for these species. The NRA has in the past adopted a habitat maintenance and protection approach to conservation paying less attention at individual species. There is a risk that conservation based on a habitat management policy will no further the conservation of certain species. In addition, certain ‘nuisance’ species cause problems for conservation by having a negative impact on more valued species or ecosystems. Through the combination of the review of current legislation and literature and consultation with NRA staff, this project identified key rare and nuisance species of interest to the NRA and prioritised research needs to develop conservation strategies for these species.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; UK ; Conservation ; Species management ; Rare species ; Nuisance species
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 54
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  • 16
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10937 | 1256 | 2013-03-26 13:58:19 | 10937 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-02
    Beschreibung: This is the Species management in aquatic Habitats WRc Dec 1993 produced by the National Rivers Authority in 1993. This report is focused on the Phase 1 of the Species Management in Aquatic Habitats, based on the Development of priority lists of rare and nuisance species for the National Rivers Authority (NRA). Certain ‘nuisance’ species cause problems for conservation by having a negative impact on more valued species or ecosystems. This project was initiated as part of a programme of research to develop strategies for the management of both rare and nuisance species. This project identified key rare and nuisance species of interest to the NRA and prioritised research needs to develop conservation strategies for these species. A combined provisional list of almost a thousand rare species, a priority list of 58 species of potential interest and a priority list of nine nuisance species was developed by a process of literature review and from suggestions by NRA conservation staff.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; UK ; Conservation ; Species management ; Rare species ; Nuisance species ; Biomarkers
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 99
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  • 17
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    National Rivers Authority | Lowestoft, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10947 | 1256 | 2013-03-26 13:58:11 | 10947 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1989 produced by the National Rivers Authority (NRA) in 1989. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the first on salmon and migratory trout catch statistics for England and Wales published by the National Rivers Authority (NRA). From 1989 onwards, these statistics will appear each year as NRA fisheries statistics reports replacing the Data Report Series which was published by the Ministry of Agriculture Fisheries and Food (MAFF) Directorate of Fisheries Research. This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 28
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  • 18
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10948 | 1256 | 2013-03-26 13:58:02 | 10948 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1990 produced by the National Rivers Authority (NRA) in 1992. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the second compilation of salmon and migratory trout catch statistics for England and Wales published by the National Rivers Authority (NRA). Before 1989, these statistics were published by the Ministry of Agriculture Fisheries and Food (MAFF) Directorate of Fisheries Research in their Data Report Series. The 1990 data have been presented in a broadly similar format to those of 1989. However, two further NRA regions, four in all, provided effort data for rod fisheries in 1990. This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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  • 19
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    University of Florida, Florida Cooperative Fish and Wildlife Research Unit | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1001 | 3 | 2011-09-29 21:17:28 | 1001 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The value of the natural resources of the White River Basin (Basin), AR isrecognized by the area's designation as a "Wetland of International Importance". TheBasin constitutes one of the Nation's largest remaining intact forested wetlandlandscapes, second only to the Atchafalya Basin. It supports the North Americancontinent's largest concentration of over-wintering mallard ducks, a world-class troutfishery, the last vestige of a big river fishery remaining in the Mississippi River Basin,and numerous threatened and endangered species. The continued viability of thiswetland ecosystem depends on the suitability of the hydrologic environment to theresident flora and fauna. Numerous modifications of the Basin hydrologic features in thepast century have seriously impaired the sustainability of these resources. The Basinwidealterations of hydrologic processes (e.g., impoundment and regulatory releases offlows and volumes in the upper reaches, navigational modifications of lower reaches, andconsumptive demands for agricultural use throughout) have affected the hydrology of thesystem profoundly. The result is highly regulated flows and stages, vastly alteredhydrologic patterns, over-stabilized water levels, and disruption of seasonal waterdistribution patterns. Given the critical nature of hydrology in regulating the structureand function of wetland ecosystems, the impacts have been devastating, particularly tothe critical bottomland hardwoods that support the Basin's fish and wildlife resources.To date these piece-meal, system-wide, hydrologic alterations have cornmutativelydegraded the habitat value of this resource for fish and wildlife in the Basin, and havelead to changes in their numbers and distributions. In spite of the enormous stakesinvolved, there has been no comprehensive characterization of the Basin hydrology.System alterations such as channel deepening, dam construction, water allocationplans, and flood control measures are currently pending. These projects will potentiallyhrther modify the hydrologic environments of the Basin, and no doubt require mitigationmeasures. In addition, there is genuine interest in restoring aspects of the Basin's historichydrologic regime within some set of reasonable limits. In order to proceed with thiseffort, the anticipated effects of these modifications and restorations on the Basin ecologyrequire thorough study of the area's historic hydrology, so that connectivity among Basinprecipitation patterns, flow fluctuations, and land use changes can be made. A basinhydrologic characterization is an initial component of this effort. The focus of this effortwas to determine and assemble the data set from which characterization of the hydrologicenvironments of the Basin using historic and recent water level, flow, (primarily byUSGS-WRD) at locations throughout the Basin could proceed. ( Document has 11 pages.)
    Beschreibung: Research Work Order no. 203
    Schlagwort(e): Conservation ; Biology ; Limnology ; Environment ; Policies ; White River Basin ; Arkansas ; hydrology ; species
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
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  • 20
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    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1063 | 3 | 2011-09-29 21:12:04 | 1063 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: Loxahatchee can be grouped into three zones according to the patterns of change of treeislands observed from 1950 to 1991. 1 ) the edge ofthe refuge adjacent to the canals, 2) the eastern interiorof the refuge, and 3) the western interior ofthe refuge. The general trend is for tree islandsAlong the edge of the refuge to have decreased insize, number, and percent cover, while those on theinterior increased in size, nunber, and percentcover.Results from this study illustrate the importanceof flow magnitude as well as hydroperiodand depth in stucturing patterns of tree islandswithin this peat wetland. Restoration of historichydroperiods and depths without historic flow patternsmay not be sufficient to restore or maintainthe historic pattern and function of the system. (60 pages)
    Schlagwort(e): Conservation ; Biology ; Limnology ; Arthur R. Marshall Loxahatchee National Wildlife Refuge ; Florida ; hydrology ; tree islands ; water regimes
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
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  • 21
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    Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1071 | 3 | 2011-09-29 21:11:25 | 1071 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: We present a new modeling method for use in large-scale physical systems, such as the Everglades ecosystem.The current work that has been done in the ATLSS (Across-Trophic-Level System Simulation) project-whichfocuses on simulating key Everglades system components-relies on code integration. While this represents anecessary first step in analyzing the dynamics of species within the Everglades, it falls short of true modelintegration. We have constructed a methodology called object-oriented physical modeling (OOPM), which allowsa comprehensive knowledge representation to be constructedfor large-scale systems. OOPM enforces theidea that an implementation ofcomputer code can be accomplished in an incremental fashion by starting with aconceptual model and progressing to more detailed models. During this evolutionary procedure, a minimal amountof code is written, since the emphasis is on developing the conceptual model so that it not only represents theintuitive aspects ofthe model, but is also executable. OOPM provides a kind of "blueprint" for ecologists, biologistsand hydrologists to communicate and integrate models effectively. (14 page document)
    Schlagwort(e): Conservation ; Management ; Engineering ; Limnology ; Everglades ; Florida ; ecosystem ; modeling ; ATLSS (Across-Trophic-Level System Simulation) ; restoration
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 76-89
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  • 22
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    Department of Wildlife Ecology and Conservation, Everglades Research and Education Center, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1117 | 3 | 2011-09-29 21:06:20 | 1117 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The purpose of this project was to conduct a pilot project to determine the feasibility ofperforming a study to evaluate the ecological role of alligator holes in the Everglades system andto develop interagency support and a scope of work for future studies. The objectives for the firstyear were to: 1. Review existing information on the ecology of alligator holes and conduct a survey oncurrent complimentary studies.2. Conduct an ecological survey. including mapping and description. of existing alligatorholes.3. Establish interagency cooperation and support for an Alligator Hole Project. Based onthis interagency consultation develop a consensus for priorities for future research andintegration into ecosystem restoration efforts.(96 page document)
    Beschreibung: Final annual report for year 1. Submitted to: Everglades Agricultural Area Environmental Protection District
    Schlagwort(e): Biology ; Limnology ; alligator holes ; Everglades ; Florida
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 23
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    University of Florida, College of Arts and Sciences, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/369 | 3 | 2011-09-29 22:09:52 | 369
    Publikationsdatum: 2021-06-29
    Beschreibung: Work has begun on studying the factors responsible for productivityin the Florida springs, which are nearly constant temperature, constantchemical, steady state giant laboratories. Progress has been made on fiveaspects: qualitative description, quantitative description, completionof knowledge of chemical factors, measurement of productivity , developmentof productivity theory.Measurement of the primary productivity in Silver Springs and GreenCove Springs by two new methods: the raising of organisms in cages, and themeasurement of night & day differences in oxygen downstream agree roughly.Production in these springs is greater than previous production figures reportedfor marine, fresh water, and land areas. Instantaneous measures of production show large variations with season, time of day, cloud cover. Productionestimates range from 11,000 lbs per acre per year to 70,000 lbs. glucose peracre per year during daylight hours.Essential stability of the springs environment has been shown withrespect to temperature, phosphorus, and plant cover. A correlation of speciesnumber with lack of stability has been shown with insects. Quantitativestudies have shown very large plant base to pyramids of mass. Correlationof marine invasion with chlorinity has been shown. The essential aspects ofpH regulated phosphorus geochemistry in Florida have been outlined. Sometheoretical ideas on productivity have been evolved. Mapping of sessileorganisms in springs and taxonomic identification of dominants are halfcompleted. Plans for second six months include measurement of herbivoreand carnivore production rates and completion of food chain efficiencydeterminations in Silver Springs as a preparation for subsequentcomparisons between springs. (34pp.)
    Schlagwort(e): Ecology ; Limnology ; springs ; Florida ; productivity
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 24
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    University of Florida, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/374 | 3 | 2011-09-29 22:09:16 | 374
    Publikationsdatum: 2021-06-29
    Beschreibung: The effect of productivity on species variety has been studied by countsof diatom species on glass slides at favorable and unfavorable stations withinSilver Springs. Species variety has been presented in a measure that is independentof sample size, "species per cycle". This measure is based on the linear increase of accumulated species with logarithmic increase of individuals counted, which has been found approximately true for many kinds of populations in many communities. Diatom productivity was measured by the rate of chlorophyll accumulation. The poor station accumulated diatoms and chlorophyll slowly and was characterized by a large species variety. There was little change after 79 days. The rich station accumulated diatoms and chlorophyll rapidly and was characterized by a small species variety that decreased for 93 days as the density of the population increased. These results indicated that species variet was decreased by conditions of high productivity possibly through the action of high densities and competition.Twelve new diurnal production curves were obtained including two more on Silver Springs and one each for 10 different Florida Springs. A shallow oligohaline spring possessed the highest productivity of 58.0 gm/m2/day; a shaded and anerobic spring possessed the lowest producvitiy of 0.66 gm /m2/day. Findings in further studies in Silver Springs indicated a two fold diurnal chlorophyll fluctuation in the pseudoplankton going downstream, photosynthetic quotients corresponding to carbohydrate production on winter or heavily clouded days, and higher quotients corresponding to protein production on sunny, summer days; evidences that bell jar estimates of respiration in flowing water communities lead to underestimates; recalculation of mean depth of plant beds leads to a 5% estimate of photosynthetic efficiency for Silver Springs (rather than 8%). Correlated with a 20% decrease in the discharge associated with widespread drought in 1954-55 the oxygen of the main boil dropped from 2.5 ppm to 1.7 ppm. A production measurement by the diurnal oxygen and carbon-dioxide curve method was made in a somewhat isolated "boat basin." Efficiency of production in this stationary, plankton containing water of Silver Springs origin was about 1%. Further evidence was obtained of nitrate increase in water flowing from anaerobic springs over blue-green algae. The area based chlorophyll of the benthic Silver Springs community was similar to that in forests and lakes of Europe. (63 pages)
    Schlagwort(e): Ecology ; Limnology ; diatoms ; Silver Springs ; Florida ; productivity
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 25
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    University of Florida Coastal and Oceanographic Engineering Department | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/127 | 3 | 2020-08-24 02:53:49 | 127 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
    Publikationsdatum: 2021-06-26
    Beschreibung: The critical need to predict the turbidity in water due to fine-grained sediment suspensionunder wave action over mud deposits for sedimentation and erosion studies, as well assorbed contaminant transport, is well known. Since fall velocities of fine sediment particlesare very small, they can be easily transported by hydrodynamic flows such as waves andcurrents. The presence of these particles in the water column affects accoustic transmission,heat absorption and depth of the eutrophic zone (Luettich et al., 1989). Because these sedimentsalso have a strong affinity for sorbing nutrients and toxic chemicals, sediments whichhave been deposited on the bottom may function as a source of contaminants to the watercolumn if they are disturbed by eroding forces resulting, for instance, from wave action. Anoutstanding example of a water body for these problems is Lake Okeechobee, the largestshallow lake in Florida. This lake shows typical signs of artificial eutrophication mainly dueto increased phosphorus loading associated with the surrounding region. Resuspension of sediment at the bottom of Lake Okeechobee composed of fine-grainedmaterial has been examined. A sediment transport model was used to simulate likelytrends in the evolution of the vertical suspended sediment concentration profile resultingfrom wave action, and the corresponding eroded bed depth was calculated through massbalance. Requisite information on characteristic parameters and relationships related tofine sediment erodibility were derived from field sampling of bottom sediment in the lake,and through laboratory experiments using this sediment and lake water. (161pp.)
    Beschreibung: South Florida Water Management District
    Schlagwort(e): Engineering ; Limnology ; Environment ; Chemistry ; Erosion ; Fine sediment ; Lake mud ; Lake Okeechobee
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 26
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1077 | 3 | 2011-09-29 21:11:52 | 1077 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The Cabo Rojo Salt Flats, at the southwestern tip ofPuerto Rico, provide important autumn stopover and winteringhabitat for migratory shorebirds. I studied the abundanceand distribution of shorebirds and their food resources atthis site during autumn of 1990 and 1991.Small calidrids (primarily Calidris pusilla and C.mauri) were the most abundant shorebirds at the salt flats.The maximum weekly counts of small calidrids in 1990 (2,690)and 1991 (3,532) occurred in mid October. Calidrids foragedprimarily in the Fraternidad lagoon system; roosting tookplace most often at the neighboring Candelaria Lagoon.The macroinvertebrate prey important to calidrids in theFraternidad system were Dasyhelea (Diptera), Trichocorixa(Hemiptera), and Artemia (Anostraca). Changes in invertebrateabundance coincided with fluctuations in salinity. (100 page document)
    Beschreibung: Research Work Order no. 78
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Shorebirds ; Cabo Rojo Salt Flats ; Puerto Rico ; migration ; Calidrids ; Candelaria Lagoon
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 27
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1079 | 3 | 2011-09-29 21:09:38 | 1079 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This goals of this research and monitoring effort are to document nesting effortand roughly categorize success of nesting by wading birds in the central Everglades ofFlorida, and to investigate the causes of nonbreeding in a high proportion of the adultwading birds in the ecosystem The latter goal has focused on breeding of White Ibises(Eudocimus albus) and has been approached through 1) understanding the nutritional,behavioral, and hormonal aspects of normal breeding in a captive colony ofScarlet Ibises(considered conspecific to White Ibises) in central Florida, and 2) comparing breeding andnonbreeding wild White Ibises in the Everglades, in their physiology, nutritional state,breeding phenology, contaminant load, and hormonal status. This report covers work onthis project between January and November, 2000. (81 page docoument)
    Beschreibung: Research Work Order no. 191
    Beschreibung: 2000 draft Final Annual Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS) ; White Ibis ; Eudocimus albus
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 28
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1075 | 3 | 2011-09-29 21:11:45 | 1075 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This project was initiated to continue monitoring reproductive responses of wadingbirds in the central Everglades, and to investigate two areas of research considered key tounderstanding and managing wading birds: nestling energetics, and factors affecting foodavailability. This report summarizes the first of two years of work. (101 page document)
    Beschreibung: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 29
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1073 | 3 | 2011-09-29 21:11:39 | 1073 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This report documents breeding numbers, reproductive success, and foragingdispersion of long-legged wading birds in the Water Conservation Areas (WCAs) of theEverglades during the first six months of 1993. Briefly, the 1993 spring had abnormallyhigh water and windy conditions throughout the season, and produced poor nesting effort,low to moderate nesting success, and low production of young. Some species, like WoodStorks and White Ibises, did not nest at all in the WCAs. Others, like Great Egrets andTricolored Herons, showed considerably tenacity under the extremely poor nestingconditions. The 1993 season provided a rare chance to record the reproductive responses ofwading birds during sustained high water conditions. (108 page document)
    Beschreibung: Research Work Order no. 110
    Beschreibung: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 30
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    University of Florida, Department of Fisheries | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1084 | 3 | 2011-09-29 21:12:43 | 1084 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This study investigated the status of fish communitiesin 12 naturally acid Florida lakes. The small, shallowlakes were located in the Ocala National Forest, the TrailRidge, and panhandle Florida; regions where lakes have lowacid neutralizing capacities and are considered sensitive tofurther acidification from anthropogenic sources.Fifteen species from seven families were capturedduring mark-recapture sampling. Warmouth (Lepomis gulosus)was the only cosmopolitan species in the study. Bluegill(Lepomis macrochirus) and largemouth bass (Micropterussalmoides), collected from 11 and 10 lakes, respectively,were also widely distributed species. Total fish abundanceand biomass were not related to lake pH or total alkalinity.(Document has 202 pages)
    Beschreibung: Research Work Order no. 73
    Beschreibung: PhD
    Beschreibung: This document was Cecil Jenning's Ph.D. dissertation submitted to the Department of Fisheries and Aquaculture, University of Florida.
    Schlagwort(e): Biology ; Limnology ; Chemistry ; lakes ; Florida ; fishes ; community ; water chemistry
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 202
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  • 31
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1078 | 3 | 2011-09-29 21:11:55 | 1078 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This report summarizes work done during the 1998 field season on ResearchWork Order 188, for the U.S. Army Corps ofEngineers through the U.S. GeologicalService's Biological Resource Division's Florida Cooperative Research Unit.The goals ofthis work were to continue the monitoring of nesting by waterbirdsin the central and northern Everglades, and to initiate research aimed at understandingwhy a very large proportion ofthe adult wading birds in the Everglades do not initiatenesting in most years.Between January and July of 1998, we performed systematic aerial surveys ofWCAs 1, 2, and 3 ofthe central and northern Everglades in order to locate and documentbreeding colonies ofwading birds. In addition, we performed systematic ground surveysto serve as checks on the aerial work, and to document solitary nesting species, and darkcolored species not easily counted from the air. (88 page document)
    Beschreibung: Research Work Order no. 188
    Beschreibung: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 32
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1080 | 3 | 2011-09-29 21:09:44 | 1080 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This comprehensive final report summarizes the results of a four-year researchand monitoring effort (1998 - 2001) designed to document nesting effort and success bywading birds, and to investigate the reproductive physiology and ecology of White Ibises(Eudocimus albus) in the Everglades ecosystem. The monitoring of nesting has beenaccomplished bystandardized systematic aerial and ground surveys and study of nestingsuccess of nesting colonies in Water Conservation Areas (WCAs) 2 and 3 ofthe centralEverglades. The White Ibis work was accomplished through 1) investigation of thenutritional, behavioral, and hormonal aspects of "normal" breeding in a captive colony ofScarlet Ibises (Eudocimus ruber, considered by many to be the same species as the WhiteIbis), and 2) documenting the physiology, nutritional state, breeding phenology,contaminant load, and hormonal status of free- living adult White Ibises in the centralEverglades. (364 page document)
    Beschreibung: Research Work Order no. 191
    Beschreibung: 2001 final comprehensive report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Schlagwort(e): Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS) ; White Ibis ; Eudocimus albus
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 33
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    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1110 | 3 | 2011-09-29 21:07:12 | 1110 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: 79 page document.
    Beschreibung: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038
    Schlagwort(e): Limnology ; Earth Sciences ; Santa Fe River ; Florida ; geology
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 34
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    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1109 | 3 | 2011-09-29 21:08:03 | 1109 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The following bibliography was compiled for use by the CooperativeFish and Wildlife Unit and their cooperators as an aid in determiningresearch priorities in Florida wetlands. Emphasis was placed on studiesdone on the economic value of wetlands, values to fish and wildlife, methodsof sampling in a wetland area, and restoration practices. Material wasgenerally gathered from studies done in the southeast, however, somerelevant national papers were also included. (35 page document)
    Beschreibung: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038 November
    Schlagwort(e): Limnology ; Policies ; wetlands ; Florida ; values
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 35
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    Florida Cooperative FIsh and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1111 | 3 | 2011-09-29 21:07:25 | 1111 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The Suwannee River sill was constructed following extensive wildfires during1954-1955, with the intent of protecting the swamp and surrounding uplands from effectsof wildfires. During subsequent years, concern was raised that the dam might beadversely affecting the swamp ecology by extending periods of inundation, increasingwater depths, and subsequently affecting swamp vegetation. Delineating the effects ofthe Suwannee River sill on the swamp hydrologic environment and vegetationdistributions, in the process of exploring relationships among driving functions andlandscape responses, was a purpose of this research.(834 page document)
    Beschreibung: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038 November
    Schlagwort(e): Limnology ; Policies ; Suwannee River sill ; Okefenokee Swamp ; wildfires ; Florida ; wetlands ; Georgia
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 36
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    University of Florida. Department of Coastal and Oceanographic Engineering | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/496 | 3 | 2020-08-24 03:02:24 | 496 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
    Publikationsdatum: 2021-06-30
    Beschreibung: This report presents the results of laboratory studies which were carried out in the Coastaland Oceanographical Engineering Laboratory to investigate the effects of ground water tableelevations on the beach profile changes over the swash zone. The experiment was conducted atthree different water table levels while the other experimental conditions were fixed to constantvalues with regular waves. The water table levels included (1) normal water table level whichis the same as mean sea level, (2) a higher level and (3) a lower level than the mean sealevel. Special attention was given to the higher water level to investigate whether this levelenhances erosion of the beach face and also to methods of interpreting the experimental data.The experiment described herein was carried out with a fairly fine sand and has demonstratedthe significance of beach water table on profile dynamics. The increased water table levelcaused distinct effects in three definite zones. First, erosion occurred at the base of the beachface and the sand eroded was carried up and deposited on the upper portion of the beachface. Secondly, the bar trough deepened considerably and rapidly and the eroded sand wasdeposited immediately landward. This depositional area changed from mildly erosional tostrongly depositional. Third, the area seaward of the bar eroded with a substantial deepening.The lowered water table appeared to result in a much more stable beach and the resultingeffects were much less. The only noticeable trend was a limited deposition in the scour area atthe base of the beach face. (Document has 37 pages.)
    Schlagwort(e): Oceanography ; Limnology ; Engineering ; Earth Sciences ; Beach erosion ; ground water
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  • 37
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    Florida Cooperative FIsh and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1116 | 3 | 2011-09-29 21:06:16 | 1116 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: A comparison between a 1985 photo-interpreted vegetation mapand a vegetation map made from classified 1987 satellite data ofthe Loxahatchee National Wildlife Refuge showed that 81% ofsamples taken in areas occupied by cattail (Typha sp.) on thephoto-interpreted map corresponded with cattail on the satellitedata map.(5 page document)
    Schlagwort(e): Biology ; Limnology ; Engineering ; Loxahatchee National Wildlife Refuge ; satellite imagery ; cattail ; Typha sp.
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  • 38
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    University of Florida, Department of Coastal and Oceanographic Engineering | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1069 | 3 | 2011-09-29 21:11:07 | 1069 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
    Publikationsdatum: 2021-07-05
    Beschreibung: To predict the hydrodynamics of lakes, estuaries and shallow seas, a two 'dimensionalnumerical model is developed using the method of fractional steps. Thegoverning equations, i.e., the vertically integrated Navier-Stokes equations of fluidmotion, are solved through three steps: advection, diffusion and propagation. Thecharacteristics method is used to solve the advection, the alternating direction implicitmethod is applied to compute the diffusion, and the conjugate gradient iterativemethod is employed to calculate the propagation. Two ways to simulatethe moving boundary problem are studied. The first method is based on the weirformulation. The second method is based on the assumption that a thin water layerexists over the entire dry region at all times. A number of analytical solutions areused to validate the model. The model is also applied to simulate the wind drivencirculation in Lake Okeechobee, Florida.(135 page document)
    Schlagwort(e): Oceanography ; Limnology ; Engineering ; hydrodynamics ; simulations ; lakes ; estuaries ; Lake Okeechobee ; Florida ; thesis
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  • 39
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    University of Florida, Gainesville, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/373 | 3 | 2011-09-29 22:09:11 | 373
    Publikationsdatum: 2021-06-29
    Beschreibung: Production measurements at different times of the year indicate a linear relationship of light intensity and overall production at about 8% of the visible light energy reaching plant level. Measurements of a coral reef at Eniwetok indicate 6%. Further evidence of breeding at all seasons but with a quantitative pulse in the seasons of maximum light indicates that the seasonal fluctuation in primary production is routed through reproduction rather than through major changes in populations. The succession of plants and anmals of the aufwuchs has been shown with glass slides and counts from Sagittaria blades. Losss of oxygen bubbles during the day and emergence of aquatic insects at night have been measured with funnels. Bell jar measurements are reported for bacterial metabolism on mud surfaces. pH determined CO2 uptake agrees with titration determinations. A few rough estimates of herbivore production have been made from caged snails, aufwuchs succession, and fish tagging. Nitrate uptake a night by aufwuchs communities has been confirmed in a circulating microcosm experiment as well as in bell jars in the springs. Distributions of oxygen and organisms have been used to criticize the saprobe stream classification system. Theoretical consideration of maximum photosynthetic rates in teh literature data indicates logarithmic rate variation inversely with organismal size just as for respiratory metabolism. Extreme pyramid shapes are thus shown for communities in which organismal size decreases up the food chain and for other communities with the same energy influx but with organismal size increasing up the food chain. Literature data is used to further demonstrate the validity of the optimum efficiency-maximum power principle for photosynthesis. Work on plants by Dr. Delle Natelson indicates essential stability of aquatic plant communities after 3 years and about 10-20% reproducibility in previous biomass estimates by Davis. Work on an animal picture of the fishery characteristics by Caldwell, Barry, and Odum is half completed. The study of aquatic insects in relationship to spring gradients by W.C. Sloan has been completed an an M.S. thesis. J. Yount has begun a study of affect of total productivity on community composition using aufwuchs organisms on glass slides placed in different current and light conditions in Silver Springs. (49pp.)
    Schlagwort(e): Ecology ; Limnology ; Silver springs ; springs ; insects ; algae ; aufwuchs ; diatoms ; productivity ; Florida ; fishes
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  • 40
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1076 | 3 | 2011-09-29 21:11:49 | 1076 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: (113 page document)
    Beschreibung: Research Work Order no. 193
    Schlagwort(e): Management ; Conservation ; Pollution ; Biology ; Limnology ; endocrine disruption ; American alligator ; Florida ; reproduction
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  • 41
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1065 | 3 | 2011-09-29 21:10:33 | 1065 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: This Research Work Order includes three experiments to look at apple snail dry downsurvival as a function of age and season. Two of those experiments have been completedand the third one will likely run through February (depending on snail survival). The thirdexperiment began on September 2 1, 1998. The detailed results of Experiment # 1 and #2were reported in the update report of 10/15/98. The overall survival for Experiments #I and#2 are included herein for comparison with Experiment #3. (7 page document)
    Beschreibung: Research Work Order no. 182
    Schlagwort(e): Biology ; Limnology ; Florida Apple Snail ; Pomacea paludosa ; Say ; Florida ; dry down ; water levels
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  • 42
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1068 | 3 | 2011-09-29 21:11:03 | 1068 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The West Indian manatee's metabolic physiology constrains it to subtropical and tropicalregions. In waters of the United States, a manatee's ability to find reliable warm-water refugiaduring winter cold periods is critical to its survival. This report documents how radio-taggedmanatees used a network of 14 industrial and 3 "natural" warm-water sites along the east coastof Florida and Georgia duringwinter. Most industrial sites were powerplant discharges but alsoincluded pulp mill effluents. TheU. S. Geological Survey's SireniaProject tracked 71 manateesover 12 winter seasons (1986-1998) using field-based VHF radio-telemetry and Argos satellite based telemetry.Thirty-seven individuals weretracked over periodsofat least 100daysbetween November and March of a given winter, manyfor multiple years. Presence at a warmwaterrefugewasdefinedas a location occurring within 200m (for a VHF field observation) orwithin 1 km (for a satellite-determined location) ofthe site. (133 page document)
    Beschreibung: Sirenia Project, Florida Caribbean Science Center, U.S. Geological Survey
    Beschreibung: Final Report Prepared for: Florida Power and Light Company Environmental Services Dept. 700 Universe Blvd. Juno Beach, FL 33408 and U.S. Geological Survey, Florida Caribbean Science Center, Sirenia Project 412 NE 16th Ave., Rm. 250 Gainesville, FL 32601
    Schlagwort(e): Biology ; Limnology ; Information Management ; West Indian Manatee ; Trichechus manatus ; Florida ; tracking ; water temperature ; movements
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    Materialart: monograph
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  • 43
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    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1087 | 3 | 2011-09-29 21:10:01 | 1087 | Florida Cooperative Fish and Wildlife Research Unit
    Publikationsdatum: 2021-07-05
    Beschreibung: The South Florida Ecosystem encompasses an area of approximately 28,000 km2 comprising at least 11major physiographic provinces, including the Kissimmee River Valley, Lake Okeechobee, the Immokalee Rise, theBig Cypress, the Everglades, Florida Bay, the Atlantic Coastal Ridge, Biscayne Bay, the Florida Keys, the FloridaReef Tract, and nearshore coastal waters. South Florida is a heterogeneous system of wetlands, uplands, coastalareas, and marine areas, dominated by the watersheds of the Kissimmee River, Lake Okeechobee, and theEverglades.Prior to drainage, wetlands dominated the ecosystem, covering most of central and southern Florida. Thelandscapes included swamp forests; sawgrass plains; mosaics of sawgrass, tree islands, and ponds; marl-formingprairies dominated by periphyton; wet prairies dominated by Eleocharis and Nymphaea; freshwater marshes;saltwater marshes; cypress strands; and a vast lake-river system draining into Lake Okeechobee. Elevated areasthat did not flood supported pine flatwoods, pine rocklands, scrub, tropical hardwood hammocks, and xerichammocks dominated by oaks. The natural seascapes of South Florida consisted of riverine and fringe mangroveforests; beaches and dunes; seagrass beds; intertidal flats; mud banks; hardbottom communities; coral reefs; andopen, inshore shallows. All these habitats were interconnected on an extremely low topographic gradient (2.8cm/km) with elevations ranging from about 6 m at Lake Okeechobee to below sea level at Florida Bay.The Science SUb-Group (1993) described the defining characteristics of the South Florida Ecosystem and the problems that resulted from hydrologic alterations and other anthropogenic changes.Restoration objectives were proposed for each sub-regionand the region as a whole.The overall goal of the restoration effort is to restore a sustainable South Florida Ecosystem that preservesthe valued properties of South Florida's natural systems and supports productive agriculture-, fishery-, and tourist.based economies and a high quality of urban life. Sustainability means high natural productivity, human andecosystem health, and resiliency to climatic extremes and catastrophic events. It also means accommodation ofneeds of human systems-flood control, irrigation, and drinking water supply.SCOPEThis section addresses the entire ecosystem, cutting across the artificial boundaries of designatedsubregions, as well as geopolitical and geomorphological boundaries, to present the broader issues of deVelopingan interagency and interdisciplinary ecosystem-based science program to support South Florida restoration. Herewe discuss the general premise and the general approach, with brief discussions on monitoring, modeling, andspecial studies. The latter two topics are covered in greater detail in other sections. (PDF contains 119 pages)
    Beschreibung: Research Work Order no. 139
    Beschreibung: Science sub-meeting, September 27, 1994
    Schlagwort(e): Management ; Limnology ; Planning ; South Florida Ecosystem Restoration Initiative ; objectives
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  • 44
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    National Rivers Authority | Marlow, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8061 | 1256 | 2012-02-24 12:32:41 | 8061 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-28
    Beschreibung: There is a need to determine quantitative relationships between fishery status and water quality in order to make informed judgements concerning fishery health and the setting of environmental quality standards for fishery protection. Such relationships would also assist in the formulation of a system for classifying fisheries. A national database of fisheries and water quality has been collated from the archives of pollution control authorities throughout the UK. A number of probable and potential water quality effects on fish populations have been identified from a thorough analysis of the database, notwithstanding large confounding effects such as habitat variation and fish mobility, and the generally sparse nature of water quality information. A number of different approaches to data analysis was utilised, and the value of each has been appraised. Recommendations concerning the integration of water quality assessment approaches have been made and further research on fishery status, and its measurement, in relation to water quality has been suggested.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; UK ; Fish Populations ; Rivers ; River fisheries ; Water quality ; Standards ; Fishery management ; Environment management ; Data collections
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 178
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  • 45
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    National Rivers Authority
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8069 | 1256 | 2012-02-29 14:18:44 | 8069 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-28
    Beschreibung: This document is a collection of legislative documents relating to fisheries, especially Statutory Instruments, with special regards to the county Cumbria in the north of England. This includes Orders on salmon and trout spanning the years 1950-1993.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; England ; Cumbria ; Fishery regulations ; Inland fisheries ; Fishing rights ; Salmon fisheries ; Collected papers
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    Materialart: monograph
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    Format: application/pdf
    Format: 97
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  • 46
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8064 | 1256 | 2012-02-25 12:02:18 | 8064 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-28
    Beschreibung: This report considers the development of environmental quality standards (EQSs) for the salmonid fishery, cyprinid fishery, migratory fishery, commercial harvesting of marine fish for public consumption and commercial harvesting of shellfish for public consumption uses of controlled surface waters. Previous reports have been used to identify those parameters necessary for the maintenance of these five uses. Each water use is considered in a separate section within which identified parameters are discussed and standards proposed, a summary of the proposed standards is presented at the beginning of the relevant section. For salmonid, cyprinid and migratory fisheries, EQSs for substances in water have been proposed for the protection of these fisheries. For the commercial harvesting of marine fish and shellfish for public consumption uses 'Warning Levels' of substances in waters have been proposed. These 'Warning Levels' have been proposed by considering data on bioaccumulation and food standards and aim to prevent acceptable intake values and concentrations in fish/shellfish flesh exceeding statutory or recommended levels. For the commercial harvesting of marine fish for public consumption it has been concluded that the current EQSs for most List II substances for the protection of salt water life should be adequately stringent to protect this use, however for the commercial harvesting of shellfish for public consumption, these List II EQSs do not appear adequate to protect this use and more stringent 'Warning Levels' have been proposed. For all five uses considered in this report there has been found to be limited information on a number of the parameters considered and in general for indigenous species, this has been found to be especially so when considering migratory fisheries and the commercial harvesting of marine fish and shellfish.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Environment ; Fisheries ; Limnology ; UK ; Fisheries ; Environment management ; Standards ; Water quality ; Legislation ; Environmental assessment
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 162
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  • 47
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    National Rivers Authority | Levens, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7931 | 1256 | 2012-02-10 21:29:29 | 7931 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: During 1993, a comprehensive data set of scale readings, length and weight measurements was established for migratory salmonids on the River Lune. This information was collected using three methods of fish capture: 1. The Lune estuary commercial nets. 2. River Lune Forge weir fish trap. 3. River Lune rod catch scale returns. Additional information was contributed by the Kent, Leven and Duddon rod and commercial fisheries. The data shows that the salmon stock in 1993 was dominated by two year old smolts. This varies from year to year.The sea trout population displays a normal population curve in terms of numbers of fish in each age and weight class. The growth rate of salmon and sea trout is very similar even though salmon have the benefit of high sea feeding.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; Lune Catchment ; Salmo salar ; Salmo trutta ; Rivers ; River fisheries ; Salmon fisheries ; Fishery surveys ; Kelt ; Stocking density ; Distribution ; Spawning populations
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 62
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  • 48
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8529 | 1256 | 2012-12-21 15:22:29 | 8529 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-03
    Beschreibung: Fish tracking is a valuable technique for the provision of detailed information on thebehaviour patterns of individual fish especially during estuarine and riverine migration.2. Tracking studies help in the provision of a comprehensive description of the variety offishbehaviour patterns in response to factors such as water flow, obstructions and waterquality.3. There are advantages to be gained by complementing fish tracking studies with datacollected from fish counters and vice versa.4. An overall evaluation of NRA fish tracking projects is presented in the wider context ofNRA strategic research objectives.5. The requirement for future development of tracking equipment, improved data analysistechniques, better communication and more immediate report preparation is identified.6. Individual project evaluation is given for NRA (or the appropriate Water Authoritypredecessor) tracking studies conducted on the Ribble estuary, the River Tamar, RiverTorridge, Rivers Test and Itchen, River Lodden, the Welsh River Dee, River Glaslyn,River Taff, River Tawe, River Tywi, River Usk, Rivers Avon and Stour and the RiverFrome.7. An outline for future strategic research is provided which identifies particular areas forstudy:-i) Identification of environmental factors which control the entry of fish into rivers.ii) Improvement of the understanding of the relationship between water flow andupstream movement of salmonids.iii) Examination of the detailed movements and behaviour of fish in relation toobstructions.iv) Closer definition of water quality requirements for salmonid fish.v) Definition of habitat preferences of salmonids in rivers.vi) Subsidiary topics such as the movements of non-salmonid fish and the downstreammigration of kelts and juvenile salmonids.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; UK ; Rivers ; River fisheries ; Salmo salar ; Salmo trutta ; Stream flow ; Tracking ; Water quality ; Fishery management
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 49
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8556 | 1256 | 2021-02-27 19:44:35 | 8556 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-03
    Beschreibung: The study began on the 7th January 1991 and was completed in June 1991. Two reports have been produced. This report published as R&D Note 33 describes NRA trackingstudies, tracking techniques and fish counter technology. The second report published as R&D Note 34 evaluates NRA tracking studies and recommends future research. The latterwill be used solely for NRA management purposes. This report briefly outlines the programme of the NRA, placing the Fisheries programme in the context of the work of the NRA as a whole, and viewing the tracking work against thebroader requirements of the NRA Fisheries research programme. Two techniques currently exist for studying the detailed timing and extent of movements of adult salmon: tracking of individually identifiable fish, and counting the numbers of fish moving past a fixed point in the river. Further details of these techniques and their development are given in Sections 2 and 3. Section 4 summarises and assesses completed and current NRA tracking Studies. Completeproject descriptions for the studies are contained in Appendix A. Section 5 discusses the scientific content of these studies in relation to similar work carried out elsewhere in the UK. Section 6 details the future development of tracking techniques. Tracking work on migratory salmonids has tended to concentrate largely upon the movements of adult salmon. Much of this report will therefore be concerned with salmon trackingstudies. NRA studies involving sea trout are referred to where appropriate. The methodological problems of sea trout tracking studies are summarised in Section 2.1.3.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; UK ; Rivers ; River Fisheries ; Salmo salar ; Salmo trutta ; Migratory species ; Tracking ; Tagging ; Fish counters ; Stream flow ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 96
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  • 50
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    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8571 | 1256 | 2012-12-20 20:51:52 | 8571 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-07-03
    Beschreibung: In Britain, many birds eat fish in fresh waters but only three species, cormorant, red-breasted merganser and goosander, are commonly perceived to present serious problems for freshwater fisheries. Complaints are mainly that cormorants eat large fish and that all three bird species eat so many juvenile fish, that there are subsequently fewer fish to be harvested or angled, but alsothat persistent predation by birds changes fish behaviour so that they are less 'catchable'.To this end, this report reviews existing information on the current status, foraging ecology, and population biologyof the three bird species as background to their potential impact on fisheries. Discusses fish population dynamics within the context of predation effects. Reviews existing experimental evidence for impacts on fish populations and fisheries; and describes current legislation, discusses potential criteria for serious damage to a fishery, andsuggests ways forward for NRA policy and research.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: R and D Project Record 461/8/N and Y
    Schlagwort(e): Environment ; Fisheries ; Limnology ; Great Britain ; Europe ; River fisheries ; Freshwater fish ; Predators ; Predator control ; Fish populations ; Environmental assessment
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 106
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  • 51
    ISSN: 1434-193X
    Schlagwort(e): Triplet recombination ; Electron transfer ; Radical ions ; Photochemistry ; Terpenes ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The triphenypyrylium tetrafluoroborate (TPT)-sensitized reactions of several terpene donor molecules, including sabinene (1), α-phellandrene (4), α-terpinene (5) and γ-terpinene (6) give rise to significantly different products than reactions induced by other electron-transfer sensitizers, such as 1,4-dicyanobenzene (DCB). The divergent reactions require decidedly different key intermediates; the products obtained with TPT can be explained by dissociative recombination of the intermediate radical-radical cation pair in the triplet state, generating donor-derived biradicals.
    Materialart: Digitale Medien
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  • 52
    ISSN: 1434-193X
    Schlagwort(e): Azides ; Cleavage reactions ; Cycloadditions ; Nitrogen heterocycles ; Polycycles ; Ring expansion ; Synthetic methods ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---2-Alkyl-1-methylquinazolinium hexafluorophosphates 9 are deprotonated by sodium or potassium hydride to afford solutions of 2-alkylidenedihydroquinazolines 10, which were investigated by NMR spectroscopy. Trapping with methanesulfonyl azide (5a) of 10 in situ or subsequent treatment with trifluoromethanesulfonyl azide (5b) gives mixtures of colourless (15) and intensely yellow N-sulfonylimino-1,4-benzodiazepines 16 along with products due to cleavage of the exocyclic double bond of 10, viz. 11 and 13. The ethylidene compound 10b yields the bicyclic products 18 and 19, apparently by complex sequences of reactions that are triggered by removal of the acidic proton at C-2 of 16b and 16f. The structures of the products are based on spectroscopic evidence and X-ray diffraction analyses performed on 15b, 16d, 16e, and 19.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 53
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1589-1593 
    ISSN: 1434-193X
    Schlagwort(e): Azaallenium ions ; Azaallylium ions ; Iminium ion ; Kinetics ; Linear Free Energy Relationships ; Ab initio calculations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The rate constants for the reactions of the 2-azaallenium ion 1b+, the 2-azaallylium ion 2a+ and the iminium ion 3+ with different nucleophiles were determined by 1H NMR spectroscopy. By correlation with the Linear Free Enthalpy Relationship (LFER) lg k20°C = s (E + N), developed by Mayr and Patz, the electrophilicity parameters E(1b+) = -3.7, E(2a+) ≍ -16 and E(3+) = -10.43 were obtained. They show that the relative reactivities of these ions are approximately 1012:1:106. Quantum chemical calculations (ab initio, DFT) of the methyl anion affinities for the ions 1b+,2a+ and3+ are in agreement with the experimental E values. The X-ray structure of 3+·CF3SO3- is reported for the first time; it shows no strong interaction between the cation and the anion.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 54
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1595-1601 
    ISSN: 1434-193X
    Schlagwort(e): Oxazoline N-oxide ; Cycloadditions ; Cycloadditions ; Lactams ; Thienamycin ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---[3+2] Cycloaddition between a camphor-derived oxazoline N-oxide 9 and the γ,δ-unsaturated enamino ester 11 afforded the single adduct 6. A stereoselective reduction of the enamino ester side chain allowed the control of the absolute configuration of the two additional asymmetric centres. Nitrogen protection and oxidative hydrolysis of the resulting product 13, followed by further functional group manipulations, led to the β-lactam derivative 1, a known precursor of the β-methylthienamycin derivative2a.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 55
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1603-1607 
    ISSN: 1434-193X
    Schlagwort(e): Boron ; Cyclotrimerizations ; Nitrogen heterocycles ; Macrocycles ; Subphthalocyanines ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The regioselective preparation of ortho-substituted subphthalocyanides was achieved employing 3-substituted phthalonitrile derivatives as starting materials. A mechanistic proposal has been outlined.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99525_s.pdf or from the author.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 56
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1609-1615 
    ISSN: 1434-193X
    Schlagwort(e): Terpenoids ; Natural products ; Total synthesis ; Cyclizations ; Rearrangements ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---A new route for the synthesis of 2,7- and 7-functionalized labdanes starts from (R)-carvone (1). 11-Nordrim-7-en-9-one (15) is an appropriate starting material for the total synthesis of hispanone (21), a biologically active furolabdane isolated from the Mediterranean medicinal plant Ballota saxatilis.
    Materialart: Digitale Medien
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  • 57
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1623-1626 
    ISSN: 1434-193X
    Schlagwort(e): Iridoid glucoside ; (8S)-Kingiside ; (8S)-Loganin ; (8S)-7-Ketologanin ; Asymmetric synthesis ; Natural products ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The tetraacetyl derivative 8 of the naturally occurring kingiside (8a) was prepared from aucubin (1). Intermediates in the synthesis were (8S)-tetraacetyl loganin (6) and (8S)-tetraacetyl-7-ketologanin (7), whose free (8R)-epimers occur in many different plants (Caprifoliaceae, Loganiaceae). The 13C NMR spectrum allows the structure to be unequivocally identified.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 58
    ISSN: 1434-193X
    Schlagwort(e): Tetrakis(dimethylamino)naphthalenes ; Basicity ; Hydrogen bonds ; Cyclicvoltammetry ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---For comparison to the recently described 2,3,6,7-tetrakis(dimethylamino)naphthalene (1) the three isomers 2,3, and 4 were synthesized. The basicities of this group of isomers are strongly dependent upon the different mutual orientations of the pairs of dimethylamino substituents: only the isomers 3 and, partially, 4, both with dimethylamino groups in adjacent peri-positions of the naphthalene, are strong “proton sponges”. For the isomers 1 and 2 with the same number and kind of twofold dimethylamino substituents in neighbouring ortho-positions, however, no significant basicity increase is observed. To explain this difference between the two groups of isomers it is suggested that in the ortho-pairs of 1 and 2 the C-N bonds diverge considerably, leading to an increased N···N distance and consequently to less stable [N···H···N]+ hydrogen bonds in contrast to the parallel C-N bonds in the peri-substituted isomers 3 and 4. X-ray crystal structure analyses of the bases and of some of the salts derived therefrom were solved and are discussed. Cyclic voltammetry indicates that 1 to 4 are strong electron donors, reacting easily to radical cations or dications which with suitable acids have been obtained as salts.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 59
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1677-1683 
    ISSN: 1434-193X
    Schlagwort(e): Radicals ; Cyclizations ; Pyridinethione ; Tetrahydrofurans ; Asymmetric synthesis ; Thiazolethione ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The trisubstituted functionalized tetrahydrofurans 10, 11, 16, 18, and 19 were photochemically prepared from 2,3-syn- and 2,3-anti-configuredN-(3-benzoyloxy-5-hexen-2-oxy)thiazole-2(3H)-thione anti-6, pyridinethiones 7, anti-8, and BrCCl3. The formation of tetrahydrofurans was achieved by an efficient and highly regioselective alkoxyl radical cyclization (5-exo-trig). The 2,3-anti substituted intermediates 9 and 12 cyclize stereoselectively whereas a 2,3-syn-configured O-radical affords both possible diastereomeric addition products in equal amounts. The cyclized tetrahydrofuryl methyl radicals were trapped with the bromine atom donor BrCCl3 to afford the bromomethyl-substituted cyclic ethers 10, 11, 18, and 19 in excellent yields. The utility of this reaction was stressed by conversion of one of the newly prepared tetrahydrofurans in a two-step synthesis into (+)-allo-muscarine (+)-20.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99590_s.pdf or from the author.
    Materialart: Digitale Medien
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  • 60
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1685-1694 
    ISSN: 1434-193X
    Schlagwort(e): Thioketones ; Thiocarbonyl ylides ; Cycloadditions ; Cycloreversions ; Sulfur heterocycles ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Reactions of diaryl thioketones with diazomethane at room temperature afford 4,4,5,5-tetraaryl-1,3-dithiolanes; the scope of this surprising 2:1 interaction has been studied for decades (Schönberg Reaction). The clue to the mechanism was our observation that the stoichiometry is 1:1 at -78 °C, and 2,5-dihydro-2,2-diaryl-1,3,4-thiadiazoles are formed as primary [2+3] cycloadducts. They lose N2 at -45 °C in first-order reactions generating diaryl thioketone S-methylides which can be intercepted by thioketones (→1,3-dithiolanes), multiple CC bonds, or acids HX. In the absence of trapping reagents, the elusive intermediates either dimerize furnishing 2,2,3,3-tetraaryl-1,4-dithianes or give rise to 2,2-diarylthiiranes by electrocyclization. Beyond thiobenzophenone and diazomethane, our main model reaction, the studies involve fluorene-9-thione, 4,4-dimethoxy- and 4,4-dichlorothiobenzophenone. The ring of 2,5-dihydro-2,2-diphenyl-1,3,4-thiadiazole (8) is opened by LDA at -78 °C and derivatives of anion 12 are obtained. - In summa: The Schönberg reaction consists of two 1,3-dipolar cycloadditions, linked by a 1,3-dipolar cycloreversion.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 61
    ISSN: 1434-193X
    Schlagwort(e): Conjugation ; Boron ; Sensors ; Cyclic voltammetry ; Polymers ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---New electropolymerizable aromatic compounds (i.e. pyrrole, thiophene, aniline) bearing boronic acid and ester substituents have been synthesized and their electrochemical behavior has been investigated. Functionalized polythiophene and polypyrrole films could be anodically generated in acetonitrile, whereas the polyaniline derivative was electroformed in an acidic aqueous solution. The electrochemical responses of some of these materials were changed when fluoride ions were added to the electrolytic solutions. The strongest modifications, caused by binding of fluoride by the immobilized boron, were observed for the polypyrrole derivative in hydroorganic media.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 62
    ISSN: 1434-193X
    Schlagwort(e): Heterocycles ; Zinc ; Palladium ; Catalysts ; Sulfur ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Organozinc halides derived from Grignard reagents behave differently in their reaction with ethyl (±±)-(2RS,3SR)-tetrahydro-4-methylene-2-phenyl-3-(phenylsulfonyl)furan-3-carboxylate (3) according to the hybridisation of the carbon ligand. During the development of short multi-component reactions for the synthesis of diverse functionalized ethyl 2,5-dihydrofuran-3-carboxylates it was discovered that aryl and vinyl zinc halides undergo clean reaction with 3 in the presence of Pd(PPh3)4. In contrast, when alkyl zinc halides are reacted with 3 in the presence of Pd(PPh3)4, reductive desulfonation of 3 is observed. Remarkably, in the absence of a transition metal catalyst, the allylic substitution of 3 with alkyl zinc halides proceeds cleanly and in moderate to good yield.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 63
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1727-1734 
    ISSN: 1434-193X
    Schlagwort(e): Self-assembly ; Vapor-pressure osmometry ; Resorcin[4]arenes ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Resorcin[4]arene tetracarboxylic acids 5,6 (A) and resorcin[4]arene tetrapyridines 2,3 (P) self-assemble in chloroform solution to form stable heterotopic AP dimers. Data from NMR titration and dilution experiments, as well as from vapor-pressure osmometry (VPO), indicate that the AP dimer is formed with an association constant greater than 107 M-1. Solid-solution extraction experiments are indicative of the formation of a 2:1 trimer (A2P), while self-associated homotopic species (A2 and A3) can be detected by NMR and VPO. Analysis of the heterotopic noncovalent assembly process over a range of compositions shows that these other species are much less stable than the AP heterodimer, which is the exclusive species at an A/P concentration ratio of 1:1 (〉 99.7% of the total at 10 mM).
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 64
    ISSN: 1434-193X
    Schlagwort(e): Sulfoxides ; β-Amino sulfones ; Mannich type reaction ; Lithium perchlorate ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The LiClO4-mediated one-pot reaction of aldehydes with (trimethylsilyl)dialkyl amines and the lithium salt of sulfoxides or sulfones, affords the corresponding β-(dialkylamino) sulfoxides and β-(dialkylamino) sulfones in high yields. The aminosulfoxidation reaction of aliphatic or aromatic aldehydes lacks diastereoselectivity, but the diastereomeric sulfoxides can be separated by HPLC or column chromatography for further use.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 65
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1741-1744 
    ISSN: 1434-193X
    Schlagwort(e): Bridged pyranose derivatives ; Ring enlargement ; Carbenes ; Glycosides ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Addition of dichlorocarbene to the glycal (±±)-2 followed by cyclopropyl-allyl rearrangement leads to the chloro-2H-pyran (±±)-4. Oxidation of (±±)-4 and reduction of the obtained hydroxypyranone (±±)-5 gave the methyl pyranoside (±±)-6. The relative configuration of (±±)-6 was established by X-ray structural analysis of the corresponding acetate (±±)-7. The synthesis of the optically active starting materials (+)-2 and (-)-2 is also reported.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 66
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1745-1758 
    ISSN: 1434-193X
    Schlagwort(e): CMP-Neu5Ac analogues ; Enzyme inhibitors ; Substrate analogues ; Transition state analogues ; Transferases ; Carbohydrates ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Quinic acid was transformed into phosphitamides 16, 25, and 36, which could be readily linked to 5′-O-unprotected cytidine derivative 17. Ensuing oxidation of the obtained phosphite triesters with tBuO2H and hydrogenolytic de-O-benzylation furnished the corresponding phosphate diesters 18, 26, and 38. Base catalyzed removal of acetyl protecting groups, and methyl ester hydrolysis furnished CMP-Neu5Ac analogues 1d, 1e, and 2. Quinic acid was also transformed into 1,2-unsaturated diallyl α-hydroxymethyl-phosphate derivatives (R)- and (S)-46, which on reaction with cytidine phosphitamide 47 afforded the phosphite triesters. Subsequent oxidation with tBuO2H and then treatment with NEt3 gave phosphate diester derivatives (R)- and (S)-48. Deallylation, acetyl group removal, and methyl ester hydrolysis furnished (R)- and (S)-3, respectively. Treatment of (R)- and (S)-48 with DBU as a base led to acetic acid elimination, thus yielding, after de-O-allylation, acetyl group cleavage, and ester hydrolysis, diene derivative (E)-4. Donor substrate analogues 1d and 1e exhibited good α(2-6)-sialyltransferase inhibition (Ki: 2.0·10-4 and 2.0·10-5 M). However, transition state analogues (R)-, and particularly (S)-3 showed excellent inhibition properties (Ki: 1.6·10-6 and 2.7·10-7 M).
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 67
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1759-1765 
    ISSN: 1434-193X
    Schlagwort(e): Cyclitols ; Aminocyclitols ; Glycosidase inhibitors ; α-Mannosidase inhibitors ; Deoxygenation ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Three deoxy derivatives 2-4 of the α-mannosidase inhibitor mannostatin A (1) were synthesized, and their inhibition of Jack bean α-mannosidase was evaluated in order to elucidate the roles of each of the three hydroxyl groups of the inhibitor. The 1- and 2-deoxy derivatives 2 and 3 retained some inhibitory activity, although reduced by a factor of about 100 relative to the parent, whereas it was completely lost with the 3-deoxy derivative 4. Structure and activity relationships are discussed in the light of these findings.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 68
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1767-1772 
    ISSN: 1434-193X
    Schlagwort(e): Circular dichroism ; Conformation analysis ; s-Triazines ; Chiral auxiliaries ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---CD data of the optically pure 2-[(R)-1-(9-anthryl)ethylamino]-4-chloro-6-[(R)-1-(1-naphthyl)ethylamino]-1,3,5-triazine, 2[(R)-1-(9-anthryl)ethylamino]-4,6-bis[(R)-1-(1-naphthyl)ethylamino]-1,3,5-triazine, 2,4-bis[(R)-1-(9-anthryl)ethylamino]-6-chloro-1,3,5-triazine are presented. The analysis of the CD spectra by means of the nonempirical DeVoe approach has afforded the complete conformational characterisation of the three s-triazine derivatives, allowing us to establish how the conformation of these derivatives depends on the nature of the substituent 1-arylethylamino groups.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 69
    ISSN: 1434-193X
    Schlagwort(e): Cycloadditions ; Carbenes ; Nitrones ; Nitrilimines ; Pyrazolines ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The reaction of tert-butylalkynyl chromium Fischer carbene complex 1 with nitrones 2 affords β-enamino-ketoaldehydes 4 by the light-promoted rearrangement of the corresponding [3+2] cycloadduct carbene complexes 3. On the other hand, [3+2] cycloaddition of chiral nonracemic Fischer alkenyl carbene complexes 19 with nitrilimines 10 yields enantiomerically pure Δ2-pyrazolines with high regio- and diastereoselectivity.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 70
    ISSN: 1434-193X
    Schlagwort(e): Asymmetric synthesis ; Zinc ; Transition structures ; QM/MM computations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Trimethylsilyl substitutions of the fenchyl alcohols [(1R,2R,4S)-exo-(2-Ar)-1,3,3-trimethylbicyclo[2.2.1]heptan-2-ol, Ar = 2-methoxyphenyl (1) and Ar = 2-(dimethylaminomethyl)phenyl (2)] yield the chiral ligands 3 [Ar = 2-methoxy-3-(trimethylsilyl)phenyl] and 4 [Ar = 2-(dimethylaminomethyl)3-(trimethylsilyl)phenyl]. Increased reactivities and enantioselectivities in diethylzinc additions to benzaldehyde are obtained from 3 (63% ee R) and 4 (93% ee S), relative to 1 (26% ee S) and 2 (73% ee S). X-ray crystal structures of 3 and of its methylzinc complex 3-Zn reveal out-of-plane bending of the methoxy groups as major geometrical consequences of the trimethylsilyl substitutions. Analyses of QM/MM ONIOM μ-O transition-structure models for 1, 2, 3, and 4 show that trimethylsilyl-induced distortions of methoxy and of dimethylaminomethyl groups explain the observed increased enantioselectivities.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 71
    ISSN: 1434-193X
    Schlagwort(e): Palladium ; exo-π-Allylpalladium complexes ; Allylic alkylation ; Spiro compounds ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The palladium(0)-catalyzed alkylation of 2,3-bis(acetoxymethyl)bicyclo[2.2.1]hepta-2,5-diene 1 with malonate-type enolates as nucleophiles is investigated. A monoalkylated product is formed first, and undergoes (depending on the nucleophile used) a second intramolecular reaction leading to spirocyclopropane-annulated bicyclo[2.2.1]heptene derivatives 5. The formation of endo spirobicyclic cyclopropanes adducts as major isomer is rationalized by assuming formation of an intermediate exo-(π-allyl)palladium complex.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 72
    ISSN: 1434-193X
    Schlagwort(e): Ketones ; Reductions ; Micelles ; Cobalt ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Operationally simple and environmentally benign procedures have been developed to selectively reduce different α,β-unsaturated ketones, 4,4-dimethylcyclohex-2-ene-1-one (1), isophorone (2), benzylideneacetone (3), chalcone (4) by NaBH4 or by the system NaBH4 + CoCl2. Alternative reaction media to the extensively used MeOH have been explored, and new procedures take advantage of the acceleration and chemoselectivity induced by water or by aqueous micellar solutions. It was possible to selectively and quantitatively afford pure products of 1,2 and of 1,4 reduction as well as the totally reduced compounds (yield and selectivity 〉 90%) by simple changes in the experimental conditions.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 73
    ISSN: 1434-193X
    Schlagwort(e): C-Glycosides ; Conformation analysis ; Molecular dynamics ; Selectins ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The conformational behavior of the C-glycosyl analogue of sialyl-α-(2→3)-galactose, synthesized as a glycosidase inhibitor, has been studied using a combination of NMR spectroscopy (J and NOE data) and molecular dynamics calculations. The obtained results show that the population distribution of conformers with respect to the orientation about the pseudo-glycosidic linkages is mainly controlled by steric interactions. This is in contrast to findings made for O-glycosides. In these natural compounds, the conformational behavior about the glycosidic linkage Φ is mainly governed by the exo-anomeric effect.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 74
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1815-1820 
    ISSN: 1434-193X
    Schlagwort(e): Asymmetric synthesis ; Palladium-catalysed couplings ; Palladacycles ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Chiral C2-symmetric N-benzylazetidines have been conveniently prepared from optically pure anti-1,3-diols without loss of enantiomeric purity. N-Debenzylation led to the corresponding N-unsubstituted azetidines, which were then subjected to palladium-catalysed coupling reactions with aryl bromides to afford chiral N-arylazetidines. (R,R)-N-Benzyl-2,4-dimethylazetidine has been employed in the synthesis of a new cyclopalladated complex, which can be used, for instance, as a chiral recognition agent for phosphorus ligands.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 75
    ISSN: 1434-193X
    Schlagwort(e): Cyclizations ; Spiro compounds ; Nucleosides ; Isomerizations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Syntheses of the spiro nucleosides 2′-deoxyhydantocidin 3a and its 1′-epimer 3b are described. The newly developed route involves a Horner-Wadsworth-Emmons condensation of the phosphonate 16 with the erythrose derivative 15 affording a mixture of six isomers which was fully assigned by NMR spectroscopy. The mixture was directly converted into the final compounds in an efficient base-catalyzed cyclization reaction. A base-catalyzed interconversion between the two isomers was observed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 76
    ISSN: 1434-193X
    Schlagwort(e): Benzodiazepines ; Heterocycles ; Azeto[1,2-a]-1,5-benzodiazepines ; Cyclizations ; Cycloadditions ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The reaction of o-phenylenediamine (4) with one, two or three equivalents of p-substituted 3-dimethylaminopropiophenone hydrochlorides 5a-e was studied. 4-Aryl-2,3-dihydro-1H-1,5-benzodiazepine derivatives 6a-e were obtained in good yields, along with the 1:2-adducts 7c-e and the unexpected 1:3-adducts rac-8c-e. The type of adduct formed is determined by the molar ratio of the reactants 4 and 5 and by the nature of the substituent in the para position of the propiophenone 5.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 77
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1965-1971 
    ISSN: 1434-193X
    Schlagwort(e): Cup-shaped PAHs ; Host-guest compounds ; Host-guest chemistry ; Cyclizations ; Semiempirical calculations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Cyclotrimerisation of benzo-polycyclic bromostannylalkenes 8a-d with Cu(NO3)2·3H2O in THF affords benzotri(benzonorbornadienes) 3a-d as a mixture of the syn and anti isomers. The ratio of syn to anti is close to the 1:3 statistical value in most cases (i.e. in cyclotrimers 3a,b,d), but highly in favour of the anti isomer in 3c, where steric hindrance by the methoxy groups plays an important role in the stereochemistry of the cyclotrimerisation. The substrates for the cyclotrimerisation, i.e. the bromostannyl alkenes 8a-d, were prepared from bromoalkenes 7a-d by treatment with base (LDA) and quenching with trimethyltin chloride. In turn, bromoalkenes 7a-d were prepared from alkenes 5a-d by radical bromination-elimination. The reaction conditions used were designed to minimise Wagner-Meerwein rearrangements that would lead to unwanted bromo isomers. The cup-shaped syn cyclotrimers 3a-d exhibit high electron density within the cavity as determined by AM1 semiempirical calculations of their electrostatic potential surfaces and are valuable substrates for supramolecular chemistry. As an example, it is shown that fullerene C60 is drawn into solution in acetonitrile by complexation with both the syn and anti trimer of benzonorbornadiene 3a.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 78
    ISSN: 1434-193X
    Schlagwort(e): Carbene complexes ; Enamines ; Metallatrienes ; Cyclopentadienes ; Dihydropyrroles ; spiro-Tetrahydropyrroles ; Iminium carbonylmetalates ; Dimetallapolyenes ; Tungsten ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Reactions of the [(1-alkynyl)carbene]tungsten complex (CO)5W=C(OEt)C≡CPh (1) with 1-aminocyclohexenes 2a-c and 7a-c afford different types of products depending on the amino substituents and the reaction conditions. (4-Aminocyclobutenyl)carbene complexes B have been shown to be generated in the first reaction step through a [2+2] cycloaddition. These are key intermediates and afford cross-conjugated tungstatrienes E, (conjugated) 1-tungsta-1,3,5-hexatrienes G, or (non-conjugated) 1-tungsta-1,3,6-heptatrienes F by following competing reaction pathways. Cross-conjugated 1-tungstatrienes 3 have been isolated in 52-74% yield by performing the reactions of 1-aminobenzocyclohexenes 2a-c with compound 1 in pentane. In dichloromethane instead of pentane, (conjugated) 1-tungsta-1,3,5-hexatrienes 4 are obtained, which subse-quently undergo fragmentation to give cyclopentadienes 6 (by π-cyclization) and dihydropyrroles (by α-cyclization) in a molar ratio dependent on the nature of the amino substituents. (Non-conjugated) 1-tungsta-1,3,6-heptatrienes 10 are generated upon reaction of 1-aminocyclohexenes 7a-c with compounds 1, which are transformed into cyclopentadienes 12 via conjugated 1-tungsta-1,3,5-hexatrienes 9 as intermediates. Reactions of 1-tungsta-1,3,6-heptatrienes 10 with the (1-alkynyl)carbene complex 1 afford dinuclear compounds 14, which subsequently yield indenes 15 (by two successive π-cyclization steps) and spiro-tetrahydropyrroles 16 (by both a π-cyclization and an α-cyclization step), depending on the steric bulk of the amino substituent.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 79
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 99-104 
    ISSN: 1434-193X
    Schlagwort(e): Allyl alcohols ; Organocerium reagents ; Alkenes ; Addition reactions ; Cerium ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Alkylcerium reagents add to the multiple bonds of allyl and propargyl alcohols in good yields and under mild conditions. The double bond can be reduced with lithium aluminum hydride in the presence of cerium trichloride. The regiochemistry of the attack depends on electronic factors.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 80
    ISSN: 1434-193X
    Schlagwort(e): Amidines ; Chiral bases ; N-Acyliminium ions ; Enantioselective catalysis ; Chiral pool ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The synthesis of four enantiopure hydroxyamidines is described. One amidine was obtained from (S)-pyroglutamic acid. Its key step involved the addition of phenylmagnesium bromide to the corresponding ester, affording the tertiary alcohol without detectable racemization. The second amidine was obtained by coupling of an (S)-malic acid derived N-acyliminium ion with β-naphthol. The other amidines were obtained from an (S)-serine-derived imide which was reduced to two diastereomeric lactams that were eventually transformed into the corresponding amidines.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 81
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 155-163 
    ISSN: 1434-193X
    Schlagwort(e): Macrocycles ; Cyclizations ; Strained compounds ; Ketophosphonate ; Iodoalkyne ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Two strategies have been explored to build the highly strained eleven-membered ring 2, a potential precursor for the biosynthetic key intermediate of the protoilludane family: an intramolecular Horner-Wadsworth-Emmons olefination and an intramolecular Nozaki-Hiyama-Kishi type-ring closure.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
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  • 82
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 165-170 
    ISSN: 1434-193X
    Schlagwort(e): Neutral anion receptor ; Hydrogen bonds ; Urea moieties ; Donor-acceptor systems ; Macrocycles ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The synthesis of macrocyclic and acyclic cleft-like anion receptors in which four hydrogen bond donating urea moieties are present in a preorganized fashion is described. NMR spectroscopy shows the complex formation with H2PO4- and Cl -. Cleft-like receptors bind H2PO4- in a 2:1 guest-host stoichiometry (Ka = 107M-2) in DMSO, whereas Cl - is bound in a 1:1 stoichiometry (Ka = 103M-1). The macrocyclic receptors form a 1:1 complex with H2PO4- (Ka = 103M-1 in DMSO) with a 100-fold selectivity for H2PO4- over Cl -.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 83
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 193-198 
    ISSN: 1434-193X
    Schlagwort(e): Nucleophilic substitutions ; Azulenes ; Hydroxylation ; Amination ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Hydroxylation of azulenes with tert-butylhydroperoxide proceeds efficiently at the 6-position when the former contain electron-withdrawing substituents in the five-membered ring. Similarly, VNS amination of azulenes proceeds with 4-amino-1,2,4-triazole; its anion, being an active nucleophile, also reacts with unsubstituted azulene. A variety of transformations of 6-hydroxyazulenes, such as substitution of the corresponding sulfonates with nitrogen, oxygen, sulfur, carbon nucleophiles and halogens, and the Claisen rearrangement of allylic ethers, is reported.
    Materialart: Digitale Medien
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  • 84
    ISSN: 1434-193X
    Schlagwort(e): Heterocycles ; Carbohydrates ; Imidazolidines ; Oxazolidines ; Spiro compounds ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Prochiral 1,3-dihydroxyacetone forms racemic oxazolidine- and oxazoline-type spiro[4.4]nonanes upon reactions with potassium (thio)cyanate and cyanamide. In contrast, 1,3-diaminoacetone yields only the corresponding spiro-bisimidazolidinethione under similar conditions together with monocyclic by-products, but the spiro-bisimidazolidinone is accessible by reaction of 1,3-dichloroacetone with urea. The resolution of the racemic spiro-bisoxazolidinethione 2a was achieved by using brucine as the resolving agent.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 85
    ISSN: 1434-193X
    Schlagwort(e): Homogeneous catalysis ; Palladium ; Acetoxylation ; Acryloxylation ; Addition reactions ; Cyclooctadiene ; Cyclooct-4-enone ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Palladium-catalyzed acryloxylation of several cycloalkenes in the presence of the Pd(OAc)2/p-benzoquinone/MnO2 catalytic system is reported. This oxidation reaction yields allylic acrylates as the sole products through the intermediacy of an η3-allyl complex. However, with 1,5-cyclooctadiene (3), cyclooct-4-enone (4) is the major reaction product. Its formation results from oxidation, which is also observed in the palladium-catalyzed acetoxylation of 3. It has been shown that this is the result of a 1,2-trans addition (acryloxy-palladation), followed by a β-hydride elimination, which yields an enol acrylate or acetate. A second Markovnikov-oriented 1,2-trans-acryloxy-palladation on the latter yields a palladium complex, rearrangement of which gives 4.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 86
    ISSN: 1434-193X
    Schlagwort(e): Amino acids ; coupling ; N-Substituted amide ; Cyclizations ; Cyclic dipeptides ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---A short synthesis of new, functionalized seven-membered ring cyclic dipeptides is described. After the coupling of N-protected β-amino acids to N-substituted α-amino tert-butyl esters, the protective groups of the terminal functions were removed and the cyclization took place diastereoselectively in the presence of the coupling agent BOP. Amide substitution was found to be effective in promoting the cyclization of linear dipeptides.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 87
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 275-280 
    ISSN: 1434-193X
    Schlagwort(e): Radical reactions ; Substituent effects ; Nitrogen heterocycles ; Dihydropyridines ; Pyrrolines ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---A set of allene-tethered benzoyloximes (5) has been treated with nBu3SnH. Depending on their substitution pattern, a wide range of compounds has been obtained. If the stannyl radical adds on the allene, the C-centred radical thus formed undergoes either a 5-exo ring closure to give the cyclopentene derivatives 7 or a 6-endo ring closure onto the N atom to give the dihydropyridines 8. If the stannyl radical adds on the benzoyl moiety, an iminyl radical is formed which leads to the 3H-pyrroles 9 and the alkylidene-pyrrolines 10. Steric effects as well as polar effects are the factors governing the reaction course.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99373_s.pdf or from the author.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 88
    ISSN: 1434-193X
    Schlagwort(e): Antibiotics ; Configuration determination ; Heterocycles ; Hongoquercin A ; Terpenoids ; Total synthesis ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---(±)-Hongoquercin A (1), the racemate of an antibacterial fungal metabolite, has been synthesized starting from geranylacetone (2) and ethyl orsellinate (ethyl 2,4-dihydroxy-6-methylbenzoate, 5). The structure (±)-1 has been confirmed by X-ray analysis of its ethyl ester (±)-10. Synthesis of the naturally occurring (+)-hongoquercin A from (-)-sclareol (11) established its configuration as depicted in 1.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 89
    ISSN: 1434-193X
    Schlagwort(e): Carbohydrates ; Amino sugars ; Protecting groups ; Glycosylations ; Trichloroacetimidates ; Oligosaccharides ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The N-DMM-Protected lactosamine derivative 2 was readily transformed into the corresponding glycosyl donor 4 and into acceptor 5. A TMSOTf-catalyzed glycosidation afforded the derived tetrasaccharide 6 which led to glycosyl donor 9. Reaction of 9 with lactose derivative 10 as acceptor gave the desired hexasaccharide 11. Cleavage of all protective groups and N-acetylation afforded the target molecule 1b (lacto-N-neohexaose). Glycosylation of acceptor 10 with donor 4 furnished tetrasaccharide 16 which, employing standard procedures, gave acceptor 18. Glycosylation of 18 with donor 9 furnished, under standard conditions, octasaccharide 19. Cleavage of all protective groups and N-acetylation afforded the target molecule 1c (lacto-N-neooctaose). Both 1b and 1c were obtained in good overall yields.
    Materialart: Digitale Medien
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  • 90
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 349-356 
    ISSN: 1434-193X
    Schlagwort(e): Sharpless asymmetric dihydroxylation ; Asimilobin ; Tetrahydrofuran ring ; Wittig reactions ; Annonaceous acetogenins ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The most efficient method for the synthesis of the trans/threo/trans-bis(tetrahydrofuran) (THF) ring unit was established, and the first total synthesis of (-)-asimilobin and its diastereomer was then accomplished in twelve and fourteen steps, respectively, from trans-1,5,9-decatriene, by a convergent route with a Wittig reaction as the key step. By virtue of these synthetic results, the absolute configuration of the bis(THF) unit in naturally occurring asimilobin should be corrected.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 91
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 381-385 
    ISSN: 1434-193X
    Schlagwort(e): Enynes ; Macrocycles ; Coordination chemistry ; Crown compounds ; Radicals ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The complex molecular structure and interesting activation mechanisms of naturally occurring enediynes have inspired the synthesis of a variety of simpler model systems to mimic their properties. While in most model compounds nucleophilic attack, isomerization or bioreduction are used to activate the unsaturated system for diradical cyclization, some attempts have been made to employ metal-ion coordination for this purpose. Significant enhancement of the thermal reactivity has been achieved by metal-ion induced conformational and electronic changes of suitably substituted enediynes, such as 1, 5, 6, 17 and 18. Enediyne activation by stoichiometric or catalytic formation of vinylidene complexes, such as 22, from terminal alkynes has also been investigated. This paper summarizes recent results pursuing the activation of enediyne diradical cyclization by metal ions.
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  • 92
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 419-423 
    ISSN: 1434-193X
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The first enantioselective synthesis of enantiomerically pure (-)-wine lactone, (-)-1a, a fragrance constituent of various white wines, and its epimer (+)-1b, was carried out. The key steps are allylic substitution of (±)-2-cyclohexen-1-yl acetate (2) with dimethylmalonate using palladium complexes of phosphanyldihydrooxazol L1 or of the phosphanylcarboxylic acid L2 as catalyst, subsequent decarboxylation, iodolactonization and elimination, furnishing enantiomerically pure bicyclic lactone (+)-7 in 47% overall yield. The diastereoselective introduction of methyl groups by SN2′-type substitution with an organocopper compound and by enolate alkylation gave lactone (-)-1a in 43% overall yield from (+)-7.
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  • 93
    ISSN: 1434-193X
    Schlagwort(e): Aplykurodins ; Marine steroids ; C-C coupling ; Cyclic peroxides ; Lactonization ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---An approach to the synthesis of aplykurodins, ichthyotoxic marine lactones, is presented. The carbon framework was derived from vitamin D3 by conversion of the readily accessible allyl alcohol 13 to the protected Grundmann's hydroxy ketone 22 and subsequent introduction of the C2 side chain through a Pd0-promoted coupling. Highly stereoselective hetero Diels-Alder reaction with O21 produced the key intermediate peroxide 25. Functional group transformations, coupled with a series of chemo- and stereoselective reactions, finally resulted in the synthesis of the unnatural analogue 17,18-dihydro-3,9-di-epi-aplykurodinone B (6).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 94
    ISSN: 1434-193X
    Schlagwort(e): Zeolites ; Radical ions ; Ring opening ; Electron transfer ; Oxidations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Incorporation of trans-1,2-diphenylcyclopropane (1) and its 3,3-D2-isotopomer into the channels of a redox-active pentasil zeolite (Na-ZSM-5) resulted in the formation of exo,exo-1,3-diphenylallyl radical (2•) and its 2-D1 isotopomer, respectively. This conversion requires oxidation, ring opening, and deprotonation, in an unspecified sequence. The allyl radical 2• is also formed upon incorporation of trans-1,3-diphenylpropene (3). A comparison with the solution photochemistry, in the presence or absence of added base, shows the conversion of 1 into 2• to be a zeolite-specific reaction. Incorporation of arylcyclopropanes 9 (R = H, OCH3) into ZSM-5 generated trans-propenylbenzene radical cations 10•+ (R = H, OCH3); the 2,2-D2 isotopomer of 9 (R = OCH3) gave rise to three different isotopomers of 10•+ (R = OCH3).
    Zusätzliches Material: 2 Ill.
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  • 95
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 485-490 
    ISSN: 1434-193X
    Schlagwort(e): Calixarenes ; Tripodal cryptand ; Extraction abilities ; Cations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---The tripodal calixcryptands have been one of the scarcely explored fields in calixarene chemistry due to the difficulties in their preparation. The strategy presented in this paper shows that novel tripodal calixcryptands can be conveniently prepared by directly treacing p-tert-butylcalix[n]arenes (n = 4, 6) with a multi-functional polypode reagent, e.g. 1,1,1-tris(tosyloxyethoxyethoxymethyl)propane or tetrakis(tosyloxyethoxyethoxymethyl)methane, under selected conditions. The first example of 1,2,4-tripodal calix[6]cryptands has been prepared. Novel calix[6]crown and doublecalix[4]arenes were co-prepared. The extraction abilities of these novel calixcryptands toward several alkali metal ions, ammonium and alkylammonium ions are presented.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 96
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 521-525 
    ISSN: 1434-193X
    Schlagwort(e): Allyl aryl sulfones ; Nitroarenes ; Condensation reaction ; Lewis acids ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Allyl aryl sulfones 2 react with aryl nitrocompounds 1 in a DBU/MgCl2 system giving the 4-arylsulfonyl quinolines 3. Some mechanistic aspects of the reaction are discussed. Application of this reaction to the formal total synthesis of the natural product (-)Eupolauramine is described.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 97
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 527-538 
    ISSN: 1434-193X
    Schlagwort(e): Furans ; Pyrans ; Dihydropyran-2-ylidenes ; Ring closure ; Addition reaction ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---On treatment with base the pentynones 8a-f undergo anionic addition reactions of the resulting enolate species to the alkyne moiety and afford the 2,5-disubstituted furans 10a-f in yields ranging from 10-91%. The proposed mechanism involves the 2-methylene-dihydrofurans 11 as intermediates which tautomerize to yield the observed products. In the case of the α-picolyl derivative 8g both possible enolates 12 and 13 are formed which are subsequently transformed to the products 10g and 14g, respectively. Starting with the hexynones 9a-e an analogous reaction takes place with the formation of the pyran derivatives 15 and 16 in comparable yields. Under the same reaction conditions the n-butyl ketone 9f gives rise to two isomeric compounds, namely the 4H-pyran 16f and the cyclohexenone 17. This result is explained by assuming initial formation of two isomeric enolates which react either by O- or C-attack on the carbon-carbon triple bond.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
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  • 98
    ISSN: 1434-193X
    Schlagwort(e): Alkylations ; Deaminated AdoHcy ; Decarboxylated AdoHcy ; Mitsunobu reaction ; Nucleosides ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---5′-Acetylthio-5′-deoxy-2′,3′-O-isopropylideneadenosine (8) was directly prepared from commercially available 2′,3′-O-isopropylideneadenosine (7) and thioacetic acid under Mitsunobu conditions in almost quantitative yield. In situ cleavage of the acetylthio function of 8 followed by coupling with different alkyl bromides proceeded with high yields. Deprotection of the obtained 5′-thionucleosides yielded the S-adenosyl-L-homocysteine analogues decarboxylated AdoHcy (11), deaminated AdoHcy (14) and 5′-[3-(cyano)propylthio]-5′-deoxyadenosine (16) in good overall yields. Direct deprotection of the thionucleoside 8 delivered 5′-thio-5′-deoxyadenosine (18) in excellent yield. In addition, binding constants of these AdoHcy analogues and the DNA methyltransferase M·HhaI were determined in a fluorescence assay.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 99
    ISSN: 1434-193X
    Schlagwort(e): Amino ketones ; Homogeneous catalysis ; Aziridination ; Copper ; Enols ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---A series of acyclic and cyclic enol derivatives 1 has been transformed into the corresponding α-amino-functionalized ketones 2 by means of enantioselective catalytic aziridination with chiral Cu complexes, prepared in situ from [Cu(MeCN)4]PF6 and the optically active ligands 3, by using (N-tosylimino)iodobenzene (PhINTs) as a nitrogen source. The best enantioselectivities (ee values of up to 52%) have been achieved for the electronically deactivated enol acetate 1aδ, but the incorporation of steric bulk and the substitution pattern at the enol double bond do not improve the ee values. The cyclic substrates react considerably less readily (only up to 45% conversion) compared to their acyclic counterparts (complete consumption). A transition structure is suggested for the asymmetric Cu-catalyzed aziridination of the enol acetate 1aδ in the presence of the chiral ligand 3b that could account for the sense of the (R)-configured product 2a.
    Zusätzliches Material: 1 Ill.
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  • 100
    ISSN: 1434-193X
    Schlagwort(e): Porphyrins ; Chiral auxiliaries ; Macrocycles ; Pyrethroids ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Esters, N,N-disubstituted amides, and a N-acylurea derived from the enantiopure industrial intermediate (1R)-cis-hemicaronaldehydic acid (or biocartol) are convenient synthons for the preparation of a series of chiroporphyrins by condensation with pyrrole. These chiral meso-tetracyclopropylporphyrins are obtained exclusively as the D2-symmetric α,β,α,β atropisomer, generally in low to moderate yields (2-20%), and in the urea case in excellent yield (60%). Hydrolysis of the urea substituents affords a chiroporphyrin with mono-N-substituted amide groups. 1H-NMR spectroscopy indicates that the ester, amide, and urea stereogenic groups sit on the porphyrin close to the metal binding site and restrict substrate or ligand access along a C2-symmetric groove. This structural feature of chiroporphyrins and of their metal complexes is of high potential interest in asymmetric catalysis and chiral recognition.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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