13,275 research outputs found
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
Theoretical and experimental investigation of chemical pattern etching
No full textThe processes occurring during wet chemical etching of partially masked copper surfaces for pattern definition were investigated. Chemical dissolution of rectangular cavities with active copper base and inert photoresist sidewalls was carried out in the presence of flowing acidic cupric chloride solutions. It was found that for a 3.5M CuCl\sb2 + 0.5M HCl + 0.5M KCl etching solution a salt film precipitated on the entire metal surface and dissolution was controlled by mass transfer of the products. The presence of recirculating eddies at the corners added extra resistance to mass transfer there, such that undercutting was suppressed and anisotropic profiles were obtained. For a 0.5M CuCl\sb2 + 0.5M HCl + 0.5M KCl etching solution the solubility of the film is higher since the ratio of Cu\sp{+2} to Cl\sp- concentration is lower; the film precipitated preferentially at the corners of a 5:1 cavity, whereas the rest of the surface dissolved film-free. Anisotropic profiles were also obtained. For the same solution and 1:1 cavities, dissolution proceeded under film precipitation on the entire surface.A mathematical model was developed in order to predict conditions for film precipitation on the entire or part of the metal surface, as well as optimum etching conditions. The model was based on finite difference and accounted for two-dimensional convective mass transport in a cavity geometry, migration, reaction equilibria, multiple species and multiple electrochemical reactions. Very good agreement between the predicted and experimentally measured average etch rates were accomplished. Operation was suggested at high oxidant concentrations and high flow velocities in order to achieve high speed etching."In addition, analysis of the chemical environment at the electrode-solution near surface region was performed in-situ by Raman spectroscopy. Indication of existence of at least CuCl\sp+, CuCl\sb2, and CuCl\sb3\sp- was found, as well as of mixed valence polynuclear ""interaction"" complexes. Due to strong overlapping of the bands of the species, resolution of the Raman spectra to individual complexes was not possible."The regeneration of the etching solution via oxidation of the products by air was investigated by means of a one-dimensional mathematical model for a flat geometry. It was found that regeneration was favored under flow conditions and at high O\sb2 concentrations, for which it took place very close to the metal surface, thus enhancing the etch rate.Made available in DSpace on 2011-05-07T13:20:22Z (GMT). No. of bitstreams: 2
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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
Cu Electrodeposition in the Presence of Organic Surfactants
No full text172 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.The organic surfactants CTA(Br\sp-) and CTA(HSO\sb4\sp-) were found to influence the advanced stages of deposition as well.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
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
Cu Electrodeposition in the Presence of Organic Surfactants
No full textThe organic surfactants CTA(Br\sp-) and CTA(HSO\sb4\sp-) were found to influence the advanced stages of deposition as well.Made available in DSpace on 2015-09-25T20:44:04Z (GMT). No. of bitstreams: 2
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only172 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997
In Situ Infrared Spectroscopic Studies of Electrodeposition Additive Adsorption on Copper
No full text184 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.CTA with bisulfate counterion promoted smooth electrodeposits. Secondary ion mass spectroscopy (SIMS) depth profiles indicated that CTA was not significantly incorporated into copper deposits grown in the presence of CTA with HSO\sb4\sp- counterion, except at very high overpotentials (500 mV). Depth profiles of deposits grown in the presence of thiourea showed incorporation of the thiourea predominantly as sulfur. Depth profiles of deposits grown in the presence of CTA with Br\sp- at sufficiently large overpotentials for electrodeposition rates to be appreciable (about 500 mV) indicated incorporation of CTA and Br. Such deposits also showed very nonuniform morphologies.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
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]
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