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  • 1
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    Testing for the potential effects of Karenia brevis on school absences [poster] (2016)
    Details
    Publication Date: 2022-05-25
    Description: Presented at the Eighth Symposium on Harmful Algae in the U.S. November 15 - 19, 2015, Long Beach, California
    Description: We analyzed a potential relationship between changes in school absences in Sarasota County and Karenia brevis (Kb) count data. Brevetoxins released during Kb blooms could be a reason for students experiencing increased respiratory or gastrointestinal illnesses, causing an increase in absence rates. We designed a map to relate the locations of Sarasota County schools and the distributions of those Kb counts with a minimum of 10,000 cell counts per liter and above. Due to the proximity of Kb counts, we hypothesized that brevetoxins could have a greater effect on the schools near the coast of Florida rather than the schools inland. Because individuals could be affected by brevetoxins up to several days after being exposed, we expected to find a lagged effect of a bloom occurrence on school absences. Using a regression approach, we were unable to detect an association between Kb counts and student absences. In some cases, the direction of the effects were opposite to what would be expected (i.e., an increase in Kb counts was associated with a reduction in the percent absent rate). The results indicated that over 70% of the variation in the school percent absent rate could be explained by the latent characteristics of individual schools (such as variations in student populations across different schools), by school week, by month (such as the effects of flu outbreaks or and other seasonal factors), and by year.
    Keywords: Florida Red Tide ; Harmful algae bloom ; HAB
    Repository Name: Woods Hole Open Access Server
    Type: Presentation
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  • 2
    Electronic Resource
    Electronic Resource
    MODERN AND ANCIENT BARRIER SEDIMENTS: NEW INTERPRETATIONS BASED ON STRATAL SEQUENCE IN INLET-FILLING SANDS AND ON RECOGNITION OF NEARSHORE STORM DEROSITS (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 220 (1973), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1973.tb40252.x
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  • 3
    Electronic Resource
    Electronic Resource
    Relict magnesian calcite oolite and subsidence of the Amazon shelf (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 24 (1977), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1977.tb00124.x
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  • 4
    Electronic Resource
    Electronic Resource
    Inlet sequence: a vertical succession of sedimentary structures and textures created by the lateral migration of tidal inlets (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 21 (1974), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Tidal inlets, narrow, comparatively deep gaps between barrier islands, are channels through which tidal currents flow vigorously as the water enters and leaves the backbarrier lagoons, bays, and intertidal flats and marshes. Many geologists have compared tidal inlets to river channels and have speculated that if an inlet shifts laterally, it should deposit a distinctive sequence of sediments, analogous to the point-bar sequence left by a meandering stream channel.Fire Island Inlet, located 56 km east of New York City, has migrated WSW at a mean rate of 64 m/year during the period 1825–1940. Waves approaching the coast, predominantly from the southeast, have shifted sediment along the shore toward the WSW. Deposition of sediment on the east side of the inlet has forced the tidal currents to erode the west side of the inlet, thus causing lateral migration.Because hydraulic conditions vary from the channel floor to the subaerial part of the spit which is present on the ENE side of the channel, sedimentary structures and textures vary systematically with depth. We have determined the various sedimentary environments associated with the modern Fire Island Inlet, sampled and described the sediments from these environments, and have collected samples from corings made on that part of Fire Island through which the inlet has migrated.On the basis of our studies, we propose an inlet sequence which is formed by the lateral migration of a tidal inlet. The sequence includes five major units, as follows on p. 492.The sediments belonging to various units in this sequence have been identified in four borings made on those parts of Fire Island through which the Fire Island Inlet has migrated since 1825.This sequence should be applicable to other inlets also. We think that the boundary between deep channel and shallow channel units remains relatively fixed at −4.5 m, whereas the thickness of the deep channel unit is determined by the depth range between −4.5 m and the total depth of the inlet. Hence, the main source of variation in the inlet sequence will be the thickness of the deep-channel unit.Most of the sediments of the inlet sequence are incised below mean low water; hence they will almost certainly be preserved in the geologic record, even if all other associated sediments from barrier environments located above mean low water are not preserved. Because of the great variability possible in rates of lateral migration of inlets along the shore compared with the rates of barrier displacement perpendicular to the shore, inlet sediments may be preserved as elongate lenses, or as widespread blankets. The shape of inlet deposits reveals much about the behaviour of barriers during a submergence. Hence, inlet sediments should shed new light on sediments of the continental shelves and on basal transgressive sands in the geologic record.〈inlineGraphic alt="inline image" href="urn:x-wiley:00370746:SED491:SED_491_tu1" location="image_n/SED_491_tu1.gif"/〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1974.tb01788.x
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  • 5
    Electronic Resource
    Electronic Resource
    Quorum-sensing cross talk: isolation and chemical characterization of cyclic dipeptides from Pseudomonas aeruginosa and other Gram-negative bacteria (1999)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 33 (1999), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: In cell-free Pseudomonas aeruginosa culture supernatants, we identified two compounds capable of activating an N-acylhomoserine lactone (AHL) biosensor. Mass spectrometry and NMR spectroscopy revealed that these compounds were not AHLs but the diketopiperazines (DKPs), cyclo(ΔAla-l-Val) and cyclo(l-Pro-l-Tyr) respectively. These compounds were also found in cell-free supernatants from Proteus mirabilis, Citrobacter freundii and Enterobacter agglomerans [cyclo(ΔAla-l-Val) only]. Although both DKPs were absent from Pseudomonas fluorescens and Pseudomonas alcaligenes, we isolated, from both pseudomonads, a third DKP, which was chemically characterized as cyclo(l-Phe-l-Pro). Dose–response curves using a LuxR-based AHL biosensor indicated that cyclo(ΔAla-l-Val), cyclo(l-Pro-l-Tyr) and cyclo(l-Phe-l-Pro) activate the biosensor in a concentration-dependent manner, albeit at much higher concentrations than the natural activator N-(3-oxohexanoyl)-l-homoserine lactone (3-oxo-C6-HSL). Competition studies showed that cyclo(ΔAla-l-Val), cyclo(l-Pro-l-Tyr) and cyclo(l-Phe-l-Pro) antagonize the 3-oxo-C6-HSL-mediated induction of bioluminescence, suggesting that these DKPs may compete for the same LuxR-binding site. Similarly, DKPs were found to be capable of activating or antagonizing other LuxR-based quorum-sensing systems, such as the N-butanoylhomoserine lactone-dependent swarming motility of Serratia liquefaciens. Although the physiological role of these DKPs has yet to be established, their activity suggests the existence of cross talk among bacterial signalling systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1999.01577.x
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  • 6
    Electronic Resource
    Electronic Resource
    Benzothiazolo[3,2-c]-1,3-dioxolo[4,5-g]quinazolines (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 1083-1090 
    Details
    ISSN: 1434-4475
    Keywords: Heterocycles ; 1 H-NMR ; Stereochemistry ; Synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde eine Reihe von 5,12a-Dihydro-6-alkyl/aryl-6H-benzothiazolo [3,2-c]-1,3-dioxolo[4,5-g]chinazoline, sowohl mitcis-als auchtrans-ständigen Wasserstoffatomen an Kohlenstoff 6 und 12a, synthetisiert. Ebenso wurden auch Verbindungen dieses Systems mit Thiazol an Position 6 hergestellt. Die Strukturen wurden mittels IR- und NMR-spektroskopischen Daten abgesichert.
    Notes: Abstract Some 5,12a-dihydro-6-alkyl/aryl-6H-benzothiazolo[3,2-c]-1,3-dioxolo [4,5-g]quinazolines withcis as well astrans stereochemistry of the hydrogens at carbon 6 and 12a have been synthesised. The synthesis of another series of compounds of the above system with thiazole ring at position 6 has also been accomplished. The structures have been established on the basis of IR and PMR data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905076
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature-dependent relaxations in VCI2:VC copolymer (1993)
    Springer
    Journal of materials science 12 (1993), S. 1555-1556 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277096
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of dye doping on TSD behaviour of PVB (1995)
    Springer
    Journal of materials science 14 (1995), S. 142-143 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456570
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  • 9
    Electronic Resource
    Electronic Resource
    Polarographic studies on o-aminobenzenethiol (1977)
    Springer
    Monatshefte für Chemie 108 (1977), S. 589-598 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polarographic behaviour of o-aminobenzenethiol (RSH) is studied at dme in 0.1M-HClO4, 0.1M-NaOH,Britton-Robinson buffers of different pH values and aqueous acetic acid. A well defined single wave is obtained in 0.1M-HClO4 and buffers of pH 2.0 at all concentrations of the depolarizer whereas in all the other buffers, a well defined single wave is obtained only if the concentration is less than 2×10−4 M. In other cases, two waves are observed. With the increase in pH, theE 1/2 becomes more negative and finally attains a constant value. Thus the dissociation constant of sulphydryl group under the experimental conditions is 5.14. The diffusion coefficient in buffer of pH 2.0 is calculated to be 5.76×10−6 usingIlkovič equation. The reaction is reversible and the oxidation product is a mercurous compound (RSHg) which converts quickly to (RS)2Hg. Even in acetic acid media, well defined reversible anodic wave is obtained in all proportions of acetic acid and water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00912804
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  • 10
    Electronic Resource
    Electronic Resource
    Titrimetric determination of mercaptans with potassium persulphate (1976)
    Springer
    Microchimica acta 66 (1976), S. 611-617 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Durch direkte Titration mit Kaliumpersulfat in Gegenwart von Jodid kann man in saurem Medium 2- und 3-Mercaptopropionsäure, Thiomalonsäure, 2-Mercaptoäthanol und Propylmercaptan bestimmen. Diese Thiole reagieren mit dem Oxydationsmittel im Molverhältnis 2 ∶ 1 unter Disulfidbildung. Die Umsetzung von Thio-p-kresol, Thioglykolsäure und Thioessigsaure mit Persulfat verläuft für maßanalytische Zwecke zu langsam. Die genannten Verbindungen werden von überschüssigem Persulfat in 2,0, 1,75 bzw. 0,75 Stunden zu Disulfiden oxydiert. Die Stöchiometrie der Reaktionen ist zeitunabhängig. 2- und 3-Mercaptopropionsäure, Cysteaminchlorhydrat, Thiomalonsäure, Thioessigsäure und Thioglykolsäure reagieren mit Kaliumpersulfat in saurer Lösung in Gegenwart von Jodcyan, das als Voroxydationsmittel und Katalysator füngiert, im Molverhältnis 1 ∶ 3 unter Bildung von Sulfonsäuren. Nur 0,25 mg Mercaptan in 50 ml Lösung sind mit ± 0,25% Fehler bestimmbar.
    Notes: Summary 2- and 3-Mercaptopropionic acids, thiomalic acid, 2-mercaptoethanol and propyl mercaptan have been determined by direct titration with potassium persulphate in the presence of iodide in acidic aqueous medium. These mercaptans react with the oxidant in 2 ∶ 1 molar ratio forming corresponding disulphides. The reaction of thio-p-cresol, thioglycollic acid and thioacetic acid with persulphate is too slow to be followed titrimetrically. However, they are oxidised to disulphide when allowed to stand with excess persulphate for 2.0, 1.75 and 0.75 hours respectively. The reaction stoichiometry is not a function of time. 2- and 3-Mercaptopropionic acids, cysteamine hydrochloride, thiomalic acid, thioacetic acid and thioglycollic acid react with potassium persulphate in acidic medium in the presence of iodine cyanide which acts as preoxidiser and catalyst, in the molar ratio 1 ∶ 3 forming corresponding sulphonic acids. As little as 0.50 mg of the mercaptan can be determined in 50 ml solution with ± 0.25 % error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01220121
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