Announcements     

W. Stuart  S. G. Peppin 《American Journal of Potato Research》1924,1(12):259-262

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Review of recent literature     

W. Stuart 《American Journal of Potato Research》1928,5(12):372-373

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Review of recent literature     

W. Stuart  W. S.  Wm. Stuart 《American Journal of Potato Research》1929,6(1):28-29

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Evaluation of a score designed to predict sepsis in foals   总被引：1，自引：1，他引：0  

Kevin T. T. Corley BSc  BVMS  MS  PhD  DACVIM  DACVECC  MRCVS    Martin O. Furr DVM  PhD  DACVIM 《Journal of Veterinary Emergency and Critical Care》2003,13(3):149-155

Objective: To evaluate the accuracy of a published score designed to predict sepsis in foals in a clinical setting and to evaluate the association of clinical and clinicopathological variables with sepsis. Design: Observational study. Retrospective for data from 1998. Prospective in 1999–2001. Setting: Foal intensive care unit of a university hospital. Animals: Client‐owned foals of less than 10 days of age, presenting from 1998 to 2001. Interventions: None. Measurements and main results: Data from the history and physical examination, together with admission hematology, biochemistry and arterial blood gas analysis were used to generate the published sepsis scores. The same data were investigated for their statistical relationship with sepsis. The presence or absence of sepsis was determined from blood culture, culture of sites of suspected local infection, clinical course and/or post‐mortem examination. The modified sepsis score was calculated for 168 foals, which were classified as septic (86), non‐septic (45) or not possible to classify (37). The modified sepsis score correctly predicted sepsis in 58 out of 86 foals and non‐sepsis in 34 out of 45 foals, resulting in a sensitivity of 67%, a specificity of 76%, a positive predictive value of 84% and a negative predictive value of 55%. Abnormal neutrophil cytology, an immunoglobulin concentration of less than 400 mg/dl, and low blood glucose concentration had the strongest association with sepsis. Conclusions: The low negative predictive value of the sepsis score limited its clinical utility. The sepsis score should not be used to define sepsis in clinical studies, unless previously validated in the study center.  相似文献   

Pharmacokinetics of florfenicol in loggerhead sea turtles (Caretta caretta) after single intravenous and intramuscular injections.     

M Andrew Stamper  Mark G Papich  Gregory A Lewbart  Stuart B May  Delta D Plummer  Michael K Stoskopf 《Journal of zoo and wildlife medicine》2003,34(1):3-8

The pharmocodynamics of single injections of florfenicol in yearling loggerhead sea turtles (Caretta caretta) were determined. Eight juvenile loggerhead sea turtles weighing 1.25 (+/- 0.18) kg were divided into two groups. Four animals received 30 mg/kg of florfenicol i.v., and four received the same dose i.m. Plasma florfenicol concentrations were analyzed by reverse-phase high performance liquid chromatography. After the i.v. dose, there was a biphasic decline in plasma florfenicol concentration. The initial steep phase from 3 min to 1 hr had a half-life of 3 min, and there was a longer slow phase of elimination, with a half-life that ranged from 2 to 7.8 hr among turtles. The volume of distribution varied greatly and ranged from 10.46 to -60 L/kg. Clearance after the i.v. dose was 3.6-6.3 L/kg/hr. After the i.m. injection, there was a peak within 30 min of 1.4-5.6 microg/ml, and florfenicol was thereafter eliminated with a half-life of 3.2-4.3 hr. With either route, florfenicol plasma concentrations were below the minimum inhibitory concentrations for sensitive bacteria within 1 hr. Florfenicol does not appear to be a practical antibiotic in sea turtles when administered at these doses.  相似文献   

Diversity and distribution of Victoria Land biota     

Byron J. Adams  Richard D. Bardgett  Diana H. Wall  Stuart Bamforth  Craig Cary  Laurie Connell  Jack W. Fell  Ian D. Hogg  Anthony O’Donnell  Rodney D. Seppelt 《Soil biology & biochemistry》2006,38(10):3003-3018

Understanding the relationship between soil biodiversity and ecosystem functioning is critical to predicting and monitoring the effects of ecosystem changes on important soil processes. However, most of Earth's soils are too biologically diverse to identify each species present and determine their functional role in food webs. The soil ecosystems of Victoria Land (VL) Antarctica are functionally and biotically simple, and serve as in situ models for determining the relationship between biodiversity and ecosystem processes. For a few VL taxa (microarthropods, nematodes, algae, mosses and lichens), species diversity has been intensively assessed in highly localized habitats, but little is known of how community assemblages vary across broader spatial scales, or across latitudinal and environmental gradients. The composition of tardigrade, rotifer, protist, fungal and prokaryote communities is emerging. The latter groups are the least studied, but potentially the most diverse. Endemism is highest for microarthropods and nematodes, less so for tardigrades and rotifers, and apparently low for mosses, lichens, protists, fungi and prokaryotes. Much of what is known about VL diversity and distribution occurs in an evolutionary and ecological vacuum; links between taxa and functional role in ecosystems are poorly known and future studies must utilize phylogenetic information to infer patterns of community assembly, speciation, extinction, population processes and biogeography. However, a comprehensive compilation of all the species that participate in soil ecosystem processes, and their distribution across regional and landscape scales is immediately achievable in VL with the resources, tools, and expertise currently available. We suggest that the soil ecosystems of VL should play a major role in exploring the relationship between biodiversity and ecosystem functioning, and in monitoring the effects of environmental change on soil processes in real time and space.  相似文献   

Do conservation managers use scientific evidence to support their decision-making?   总被引：1，自引：0，他引：1  

Andrew S Pullin  Teri M Knight  Kevin Charman 《Biological conservation》2004,119(2):245-252

Conservation involves making decisions on appropriate action from a wide range of options. For conservation to be effective, decision-makers need to know what actions do and do not work. Ideally, decisions should be based on effectiveness as demonstrated by scientific experiment or systematic review of evidence. Can decision-makers get this kind of information? We undertook a formal assessment of the extent to which scientific evidence is being used in conservation practice by conducting a survey of management plans and their compilers from major conservation organizations within the UK. Data collected suggest that the majority of conservation actions remain experience-based and rely heavily on traditional land management practices because, many management interventions remain unevaluated and, although some evidence exists, much is not readily accessible in a suitable form. We argue that nature conservation along with other fields of applied ecology, should exploit the concept of evidence-based practice developed and used in medicine and public health that aims to provide the best available evidence to the decision-maker(s) on the likely outcomes of alternative actions. Through critical evaluation, we present the challenges and benefits of adopting evidence based practice from the decision-makers point of view and identify the process to be followed to make it work.  相似文献   

Effect of drying temperature on alkylamide and cichoric acid concentrations of Echinacea purpurea   总被引：1，自引：0，他引：1  

Stuart DL  Wills RB 《Journal of agricultural and food chemistry》2003,51(6):1608-1610

Root and aerial sections (flower, stem, and leaf) of Echinacea purpurea were dried with hot air at temperatures in the range of 40-70 degrees C, and the concentrations of alkylamides and cichoric acid were determined after drying. Increasing drying temperature decreased from 48 h at 40 degrees C to 9 h at 70 degrees C but resulted in a decreased concentration of cichoric acid in all plant sections with a greater loss from aerial plant parts than from the root. There was, however, no significant difference in the concentration of the alkylamides at any drying temperature. Establishment of operational parameters for the drying of echinacea must therefore be structured around the more labile cichoric acid.  相似文献   

ELM,An Estuarine Nitrogen Loading Model: Formulation and Verification of Predicted Concentrations of Dissolved Inorganic Nitrogen     

Valiela  Ivan  Mazzilli  Stefano  Bowen  Jennifer L.  Kroeger  Kevin D.  Cole  Marci L.  Tomasky  Gabrielle  Isaji  Tatsu 《Water, air, and soil pollution》2004,157(1-4):365-391

ELM is an Estuarine Loading Model that calculates mean annual concentration of dissolved inorganic nitrogen (DIN) available to producers in shallow estuaries by considering how different processes modify pools of nitrogen provided by inputs (streams, groundwater flow, atmospheric deposition, N₂ fixation, and regeneration), and losses (burial and denitrification), within components of the estuarine system (bare sediments, seagrass meadows, salt marshes, water column). ELM also considers the effect of flushing rate within an estuary. Its formulation was constrained to minimize demands of data needed to run the model. In spite of simplifications such as the use of loss coefficients instead of functional formulations of processes, and uncertainties in all the terms included in ELM, predictions of mean annual DIN in water were not significantly different than field measurements done in estuaries in Cape Cod, Massachusetts, subject to different rates of nitrogen (N) loading. This verification suggests that, in spite of its simple formulation, ELM captures the functioning of nutrient dynamics within estuaries. ELM may therefore be a reasonable tool for use in basic studies in nutrient dynamics and land/estuary coupling. Because of its simplicity and comprehensiveness in inclusion of components and processes, ELM may also be useful in efforts to manage N loads to estuaries and related management issues.  相似文献   

Evolution of chemical and sensory properties during aging of top-fermented beer   总被引：1，自引：0，他引：1  

Vanderhaegen B  Neven H  Coghe S  Verstrepen KJ  Verachtert H  Derdelinckx G 《Journal of agricultural and food chemistry》2003,51(23):6782-6790

The aging and consequent changes in flavor molecules of a top-fermented beer were studied. Different aging conditions were imposed on freshly bottled beer. After 6 months of aging, the concentration changes were recorded for acetate esters, ethyl esters, carbonyls, Maillard compounds, dioxolanes, and furanic ethers. For some flavor compounds, the changes with time of storage were monitored at different temperatures, either with CO(2) or with air in the headspace of the bottles. For some molecules a relationship was determined between concentration changes and sensory evaluation results. A decrease in volatile esters was responsible for a reduced fruity flavor during aging. On the contrary, various carbonyl compounds, some ethyl esters, Maillard compounds, dioxolanes, and furanic ethers showed a marked increase, due to oxidative and nonoxidative reactions. A very high increase was found for furfural, 2-furanmethanol, and especially the furanic ether, 2-furfuryl ethyl ether (FEE). For FEE a flavor threshold in beer of 6 mug/L was determined. In the aged top-fermented beer, FEE concentrations multiple times the flavor threshold were observed. This was associated with the appearance of a typical solvent-like flavor. As the FEE concentration increased with time at an almost constant rate, with or without air in the headspace, FEE (and probably other furanic ethers) is proposed as a good candidate to evaluate the thermal stress imposed on beer.  相似文献