12,353 research outputs found
ECON 633: Financial Economics SP 2023 Callahan
No full textSyllabus - ECON 633: Financial Economics Spring 2023; Colleen Callahan</p
A new species of Aleurolobus Quaintance et Baker (Homoptera, Aleyrodidae) from Southern Europe.
No full textAleurolobus teucrii n. sp. is described from southern Italy and the Maltese Islands (Central Mediterranean). The species seems to be monophagous on Teucrium fruticans L. A key to the European species of this genus (A. niloticus Priesner et Hosny, A. olivinus (Silvestri), A. wunni (Ryberg) and A. teucrii n. sp.) is provided.peer-reviewe
Mosquito Larvicidal Constituents from Lantana Viburnoides SP Viburnoides Var Kisi (A. rich) Verdc (Verbenaceae).
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Lantana viburnoides sp viburnoides var kisi is used in Tanzania ethnobotanically to repel mosquitoes as well as in traditional medicine for stomach ache relief. Bioassay-guided fractionation and subtraction bioassays of the dichloromethane extract of the root barks were carried out in order to identify the bioactive components for controlling Anopheles gambiae s.s. mosquito larvae. Twenty late III or early IV instar larvae of An. gambiae s.s. were exposed to various concentrations of the plant extracts, fractions, blends and pure compounds, and were assayed in the laboratory by using the protocol of WHO 1996. Mean mortalities were compared using Dunnett's test (p < 0.05) and lethal concentration calculated by Lackfit Inversel of the SAS programme. The crude extract (LC50 = 7.70 ppm in 72 h) and fractions exhibited different level of mosquito larvicidal activity with subtraction of some fractions resulting in activity enhancement. The active fractions contained furanonaphthaquinones regio-isomers (LC50 = 5.48-5.70 ppm in 72 h) and the lantadene triterpenoid camaric acid (LC50 = 6.19 ppm in 72 h) as active principles while the lupane triterpenoid betulinic acid (LC50 < 10 ppm in 72 h) was obtained from the least active fraction. Crude extracts and some fractions had higher or comparable larvicidal activity to the pure compounds. These results demonstrate that L. viburnoides sp viburnoides var kisi extracts may serve as larvicides for managing various mosquito habitats even in their semi-purified form. The isolated compounds can be used as distinct markers in the active extracts or plant materials belonging to the genus Lantana
Thermotoga lettingae sp. nov., a novel thermophilic, methanol-degrading bacterium isolated from a thermophilic anaerobic reactor
No full textA novel, anaerobic, non-spore-forming, mobile, Gram-negative, thermophilic bacterium, strain TMO(T), was isolated from a thermophilic sulfate-reducing bioreactor operated at 65 degrees C with methanol as the sole substrate. The G C content of the DNA of strain TMO(T) was 39.2 molÐThe optimum pH, NaCl concentration, and temperature for growth were 7.0, 1.0°and 65 degrees C, respectively. Strain TMO(T) was able to degrade methanol to CO(2) and H(2) in syntrophic culture with Methanothermobacter thermautotrophicus DeltaH or Thermodesulfovibrio yellowstonii. Thiosulfate, elemental sulfur, Fe(III) and anthraquinone-2,6-disulfonate were able to serve as electron acceptors during methanol degradation. In the presence of thiosulfate or elemental sulfur, methanol was converted to CO(2) and partly to alanine. In pure culture, strain TMO(T) was also able to ferment methanol to acetate, CO(2) and H(2). However, this degradation occurred slower than in syntrophic cultures or in the presence of electron acceptors. Yeast extract was required for growth. Besides growing on methanol, strain TMO(T) grew by fermentation on a variety of carbohydrates including monomeric and oligomeric sugars, starch and xylan. Acetate, alanine, CO(2), H(2), and traces of ethanol, lactate and alpha-aminobutyrate were produced during glucose fermentation. Comparison of 16S rDNA genes revealed that strain TMO(T) is related to Thermotoga subterranea (98€and Thermotoga elfii (98Ž The type strain is TMO(T) (=DSM 14385(T)=ATCC BAA-301(T)). On the basis of the fact that these organisms differ physiologically from strain TMO(T), it is proposed that strain TMO(T) be classified as a new species, within the genus Thermotoga, as Thermotoga lettingae
Data Science Education: The Signal Processing Perspective [SP Education]
No full textIn the last decade, the signal processing (SP) community has witnessed a paradigm shift from model-based to data-driven methods. Machine learning (ML) - more specifically, deep learning - methodologies are nowadays widely used in all SP fields, e.g., audio, speech, image, video, multimedia, and multimodal/multisensor processing, to name a few. Many data-driven methods also incorporate domain knowledge to improve problem modeling, especially when computational burden, training data scarceness, and memory size are important constraints.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
Antibacterial activity of Vibrio sp. strain OCN008, a bacterium isolated from the coral Porites compressa
No full textCorals of Hawaii are increasingly experiencing outbreaks of diseases. One such disease is Montipora White Syndrome (MWS), which is hypothesized to be caused by marine bacteria. This disease causes rapid tissue loss in Montipora capitata, one of the dominant scleractinian coral species of Kaneohe Bay, Oahu, Hawaii. Vibrio sp. strain OCN008 was isolated from Porites compressa, another common species of coral in Kaneohe Bay, and was shown to inhibit the growth of three putative pathogens isolated from the coral mucus of MWS-affected M. capitata. OCN008 exhibited inhibitory activity on agar plate tests, including soft-agar overlay assays, culture droptests, and supernatant droptests. Inhibitory activity was also observed through growth curves of these putative pathogens incubated in 50% conditioned liquid medium and 50% GASW medium. The antibacterial substance was stable up to 100°C and has a molecular weight less than 3 kD. Significant pH changes were not observed in the conditioned medium, eliminating the possibility of inhibition caused by secretion of organic acids or hydrogen peroxide. The spectrum of inhibitory activity of this substance was also tested against various Gram-positive and Gram-negative bacteria, and was seen to inhibit the growth of Bacillis megaterium, Bacillus subtilis, Micrococcus luteus, and Staphylococcus saprophyticus. Further investigation on the physical nature and solubility of the antibacterial substance is required for isolation and identification of the inhibitory substance
Growth of ferroelectric thin films through metallo-organic decomposition
No full textThe objective of this investigation is to grow films with good electrical and optical properties through the process of metallo-organic decomposition (MOD) and compare them with those made with other processes such as sputtering. Thin lithium niobate and lead zirconium titanate (PZT) films were made. Films were grown on Si(100), Si(111) and sapphire(012).
Thin films made via MOD yielded crystalline films with the absence of other phases other than LiNbO\sb3. The films were polycrystalline and often randomly oriented. Grain orientation along (104) was observed on Si(100). An attenuation of 2.8 dB/cm was observed on performing optical waveguiding on films grown on sapphire. Capacitance-voltage measurements yielded dielectric constants of about 28-32 for LiNbO\sb3 films on Si. The resistivity as measured from current-voltage tests was 10\sp{12} to 10\sp{13}.
The PZT films were crystalline and no particular grain orientation was found for films grown on silicon. MOD technique was found to yield films with good stoichiometry. (Abstract shortened with permission of author.
Screening of biodiesel production from waste tuna oil (Thunnus sp.), seaweed Kappaphycus alvarezii and Gracilaria sp.
No full textBiodiesel has several advantages over solar. Compared to solar, biodiesel has more eco-friendly characteristic
and produces lower greenhouse gas emissions. Biodiesel that is made from animal fats can be produced from fish oil,
while other alternative sources from vegetable oils are seaweed Kappaphycus alvarezii and Gracilaria sp. Waste tuna oil
(Thunnus sp.) in Indonesia is commonly a side product of tuna canning industries known as tuna precook oil; on the other
hand, seaweed Gracilaria sp. and Kappaphycus alvarezii are commonly found in Indonesia’s seas. Seaweed waste that
was used in the present study was 100 kg and in wet condition, and the waste oil was 10 liter. The seaweed was extracted
with soxhletation method that used n-hexane as the solvent. To produce biodiesel, trans esterification was performed on
the seaweed oil that was obtained from the soxhletation process and waste tuna oil. Biodiesel manufactured from
seaweed K. alvarezii obtained the best score in flash point, freezing point, and viscosity test. However, according to level
of manufacturing efficiency, biodiesel from waste tuna oil is more efficient and relatively easier compared to biodiesel
from waste K. alvarezii and Gracilaria sp
Fig. 6. (a) Streptomyces sp. strain AF1 (left, Author collection) and (b) Streptomyces rochei strain AB1 (right, compared to [24])
No full textStreptomyces sp. strain AF1 (left, Author collection) and (b) Streptomyces rochei strain AB1 (right, compared to [24]
Battle of powers: Brazil: from democratic transition to constitutional resilience
No full textIn the context of strong political polarization, intensification of distributive conflicts and clashes among powers - which have permeated Brazilian political life in the last decade - , the country has experienced profound constitutional malaise. Oscar Vilhena Vieira provides us in this book with an analysis of the Brazilian institutional crises with sobriety and erudition. An acute observer of the process of constitutionalization of the Brazilian political life, the author points to the fundamental role of consensual political model adopted by the 1988 Constitution to enable and defend the rules of the democratic order
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