197,127 research outputs found
Electrochemical peroxidation of contaminated water and assessment of the toxicity using existing and novel bioassays
No full textThe treatment of wastewater and monitoring of its toxicity is essential before discharging it to
the environment. This study focuses on assessing the toxicity of wastewater following
treatment using the electrochemical peroxidation process (ECP). Three categories of low-cost
toxicity assays were used based on plant cells, microorganisms and invertebrates, all of which
do not require ethical approval or a special licence. In addition, a novel cost-effective device
was developed for assessing wastewater toxicity at low concentrations.
In Chapter 2, the problem of high turbidity of the ECP-treated samples is addressed, by
accelerating particulate settling of the existent compounds. This was achieved by storing the
ECP treated samples at low temperatures. This is an essential step for enhancing the clarity of
the processed samples in order to improve the performance of the toxicity assays. Cont/d
Rare and life-threatening complication after an attempted lower third molar extraction: Lemierre syndrome
No full textLemierre’s syndrome is also known as the forgotten disease, and is a rare but life-threatening complication that can arise after surgical extractions of infected mandibular third molars. Owing to its rarity, oral and maxillofacial surgeons might not immediately recognise or can underestimate the pathological signs, and consequently do not apply the appropriate therapy to treat the syndrome. Here, we report on the occurrence and management of a case of Lemierre’s syndrome, where the complications affected the right sigmoid sinus. Since the condition appear to be underreported and not properly highlighted, eventual systematic review and meta-analysis of the occurrence of the Lemierre’s syndrome are highly recommended
Istoriko-bytovye očerki i obzor zakonodatel'stva po staroobrjadčestvu i sektanstvu v ego posledovatel'nom razvitii s priloženiem statej zakona i vysočajšich ukazov. (s 4-mja fotografičeskimi tablicami).
No full textRepositories: HUL, KB, LC, UBB, UBM, Several American Libr.
Provenance: stamps on the title page: Bibliothek Fritz Lieb and two undecipherable stamps, probably the same as on pp. 51, 209: Biblioteka protoieraja Neofita Po?? Ljubimova v Moskve na Va??i??ovskom ???-.
Notes: inside the front board pencilled: 694/M dbl = F y 53 ? 3–, in ink: N242/Raskol, which is also on on the front flyleaf and the title page; pencilled on the front flyleaf and the title page: L 22/3. On the title page in ink: N1742 and II/340 crossed-over, pencilled: Varvara Ivanovna over the initials of the writer, and 1861–1920.
Condition: sides of the spine torn
The remediation of tributyltin-contaminated dredgins and waters
No full textTributyltin (TBT) is a pollutant, mainly introduced to the environment as a marine anti-fouling agent. The aim of this work was to assess and develop sustainable and cost-effective remediation technologies for TBT-contaminated dredged materials. For this purpose, analytical methods were developed for sediments and sediment leachates.For the sediments, a triple extraction followed by derivatisation and measurement by gas chromatography with pulsed flame photometric detection was employed, avoiding the lengthy concentration step of the organic layer. The TBT detection limit of ca 0.04 mg Sn/kg in sediment was below the suggested limit of 0.1 mg/kg for sea disposal of TBT-contaminated dredgings (OSPAR Commission). For the leachates, derivatisation and extraction into hexane was used. Also, a new procedure, with the potential for automation, was developed for the simultaneous analysis of multiple water samples, based on in situ extraction and derivatisation on C18 solid phase extraction cartridges. No legislative limits existed for TBT in leachates, therefore the detection limits of ca 6-10 ng Sn/L achieved were regarded satisfactory, as they were below or similar to the EQS for coastal and estuarine waters or freshwaters (2-20 ng/L TBT). A pilot investigation was carried out on a dockyard to evaluate the use of X-Ray fluorescence as a screening method for the presence of TBT in sediments. Due to tin contamination such a technique was not suitable for the site examined.Incineration was found to remove TBT but it would incur very high costs. Ultrasonic destruction was not effective enough, even on TBT-spiked water solutions. Carbon products, pure clays, organically modified clays, zero valent iron, fly ash and cements were screened for their abilities to prevent TBT leaching, using a leaching test. The best performer was a powdered activated carbon product which, even mixed with cement that increases the leaching of TBT, delivered a TBT-free (< 5 ng Sn/L) leaching test result 33 days after the mixing. The result showed that this technique could provide a solution for the immobilisation of TBT in contaminated dredgings by mixing this relatively low-cost, multi-purpose and inert additive, with or without cement according to the site specific requirements
Medetera varvara Grichanov & Vikhrev, sp. nov.
No full textMedetera varvara Grichanov & Vikhrev sp. nov. (Figs. 1–6) Type material. Holotype 3: Morocco, near Essaouira, 31.563 ºN 9.714 ºW, sand dune, 29 March 2009, N.Vikhrev (ZMU). Paratypes. 2 ƤƤ with same data as holotype, 28 and 29 March (ZMU). Diagnosis. Medetera varvara is related to Egyptian M. albescens (Parent) which differs from the former by silvery-white frons and face, hind coxa bearing three outer setae and fore tarsus unmodified. Ornamentation of fore legs is unknown for other species of Palearctic Medetera including M. albescens which was published with a rather detailed description. In the Afrotropics, only M. luteoscutata Parent, 1936, has a small apicoventral process on tarsomere 1 and 3 of fore leg. Mainly Pantropical Saccopheronta Becker, 1914, a sister genus (Grichanov 1997 b) or “ aberrans ’ group of Medetera species (Bickel 1985, 1987) includes species with thickened or widened tarsomeres 2 and 3 of male fore leg. The absolute majority of medeterine species of the world fauna have no remarkable fore leg decoration. Description. Male (Fig. 1): Length (mm): body 2.0, wing 2.0/ 0.7, antenna 0.7, hypopygium 0.8. Head: Frons, face, clypeus, palpus and postcranium greenish, evenly and densely dusted greyish-white, so frontoclypeal suture between face and clypeus not distinct. Postocular setae white, somewhat thickened, strongly increasing in length downward. Ventral postcranium shining greenish, with row of long white thickened setae. Frons with pair of strong vertical setae and pair of ocellar setae slightly stronger than verticals. Postverticals absent. Face relatively wide; ratio of height of face to its maximal width to height of clypeus to height of palpus, 15 / 8 / 5 / 5. Antennal segments short, with short white hairs; scape and pedicel orange-brownish, grey dusted at apex; postpedicel black, rounded. Stylus subapical, bare, about 2 times as long as ocellar seta. Proboscis short, black, shining, with white hairs. Thorax: Dark, densely grey dusted; mesonotum with 3 narrow bronze stripes distinct in anterior view. Three pairs of strong black dorsocentral setae, slightly decreasing in size anteriorly. Notopleural setae 2, sutural 1, supraalar 1, all black; 1 white humeral seta. Acrostichals very short, biseriate, white, extending to mesonotal flattening. Several white setulae in front of first dorsocentral and sutural setae. Propleuron with 5 white thickened setae, lower one almost 2 times longer than others. Scutellum with pair of strong black median setae, lateral setae absent. Legs: Yellow, except fore legs whitish-yellow, hind tibia darkened at apex, tarsomeres 4 and 5 and apical part of 2 and 3 of mid and hind legs brownish; mid and hind coxae mostly dark, grey dusted, yellow at apex. Fore coxa with dense brush of long white flattened setae on anterior surface. Fore femur and tibia without setae. Fore tarsomeres 1 to 5 each with pair of small brown apical postero- and anteroventral setulae; tarsomeres 2 to 5 each with pair of very small brown ventral setulae; tarsomeres 2 to 4 slightly flattened laterally; apical 1 / 3 of tarsomere 1 and tarsomeres 2 to 4 with comb of white thickened cilia on dorsal surface (Fig. 3). Mid coxa with dense brush of long thickened white setae on anterior surface; mid trochanter with single white seta on anterior position; mid femur without setae. Mid tibia with pair of antero- and posterodorsals at 1 / 4 and long apicoventral seta, all white. Mid tarsus with four brown apical setae on each segment; basitarsus in apical half with 4–5 short brown setulae, somewhat irregularly placed, but in either antero- or posteroventral positions, tarsomere 2 with 3 such setulae, 3 rd with 2 –3, 4th and 5 th with 2 ones each; all these setulae gradually decreasing in size apically. Hind coxa with single white seta on outer surface; hind femur with row of white dorsal setulae in basal half; hind tibia slightly thickened at apex, with posterodorsal setula at 1 / 4 and ventral apical one, both white; with very short black posterodorsal apical spur; hind tibia on apical 2 / 3, basitarsus and tarsomere 2 on basal 2 / 3 with row of short dense white posteroventral cilia; hind basitarsus short, with 2 apicals: brown anteroventral and white ventral, with small white posteroventral basal tooth and shallow basal excavation; tarsomeres 2 to 5 each with 1–3 brown anteroventral and 2–3 brown apical setulae, these setulae gradually decreasing in size apically. Fore leg length ratio (from coxa to tarsomere 5): 24 / 40 / 35 / 20 / 10 / 8 / 5 / 5, mid leg: 16 / 42 / 45 / 22 / 10 / 8 / 6 / 5, hind leg: 14 / 45 / 51 / 12 / 24 / 14 / 8 / 6. Wings: Hyaline, veins yellow in anterobasal quarter of wing, brown in other parts (Fig. 4). Costa without long hairs. R 1 short, extending to basal third of wing, R 4 + 5 and M 1 + 2 distinctly convergent at apex. Ratio of part of costa between R 2 + 3 and R 4 + 5 to this between R 4 + 5 and M 1 +2, 25/ 5. Ratio of apical to basal part of M 1 +2, 17/ 18. Ratio of cross-vein m-cu to maximal distance between R 4 + 5 and M 1 + 2 to distal part of CuA1, 10/ 11 / 12. Calypter yellow, with white cilia. Halter yellow. Abdomen: Covered with short white setulae, olive-grey dusted, with fore margin of tergites 3 to 5 bronze dorsally; posterior margin of tergite 1 with 5–6 white flattened setae on each side. Tergite 6 slightly longer than tergite 5; segment 7 longer than preceding, with short hairs; segment 8 large, left basolateral, shorthaired. Epandrium (Fig. 5) black, elongate-triangular; hypandrium basoventral, slightly swollen at base, then thinned, pointed at apex; phallus simple, pointed; epandrial lobe small, hardly divided, bearing pair of long simple setae; surstylus and cercus (Fig. 6) dark-brown; cercus fused almost to apex, covered with short white hairs. Female (Fig. 2): Length (mm): body 2.2, wing 2.2; similar to male except lacking male secondary sexual characters. Each hemitergite bearing 1 acanthophorite and 1 simple seta; acanthophorites thin, much longer than cercus; cercus small, with short hairs. Dense brush of thickened white setae on anterior surface of fore and hind coxae, but setae about two times shorter and more equal in length than those of male. Fore tarsi unmodified; tarsomeres 4 and 5 and apical part of 2 and 3 of fore legs brownish, as on mid and hind tarsi. Hind tibia without apical spur; hind basitarsus simple, without basal tooth. Distribution: Morocco. Etymology. The species is named for Varvara Vikhreva who kindly helped to collect flies in Morocco. Habitat: All three specimens of the type series were collected from sandy substrates. This habitat is rather unusual for mainly dendrophilous, sometimes petrophilous species of Medetera, although many species of the Nearctic M. petulca group occur in such habitats (Bickel pers. comm. 2009). Trees on sand dunes were also examined, but all specimens of tree trunk Medetera (M. flavipes Meigen, 1824, and M. pallipes (Zetterstedt, 1843)) collected on the Essaouira dunes (between 24 and 29 March) belong to other species groups of the genus. The senior author observed M. pallidior imagos in Southern Tajikistan (the Tigrovaya Balka Nature Reserve) in July 1978, where they populated rodent holes (to 5 cm in diameter) on a rather dry and flat semidesert plot not far from the border with a large area of riparian marshes. Males and females of the species concentrated around holes, and frightened or disturbed flies dropped immediately into the holes.Published as part of Ya, Igor & Vikhrev, Nikita E., 2009, Mediterranean species of the Medetera plumbella species group with description of a new peculiar species from Morocco (Diptera: Dolichopodidae), pp. 46-52 in Zootaxa 2170 on pages 48-51, DOI: 10.5281/zenodo.18920
“Urban text” in Lyrics of Varvara Danilova through Pprism of Silver Age Poetry
No full textThe results of the analysis of “urban text” phenomenon in the lyrics of the modern Evenk poetess Varvara Danilova are presented. The relevance of the study is due to the interest of modern literary criticism in the heritage of the indigenous peoples of the North. The novelty of the work is seen in the consideration of the features of the “urban text” creation in the V. Danilova’s lyrics in the projection on the poetic experience of the Silver Age. The theoretical basis was the works of V. N. Toporov, Yu. M. Lotman, S. P. Gurin, N. V. Schmidt, and others. The material for the analysis was the most representative poems of Danilova’s collections: “Only you ...” (1992—1996), “Heavenly Hell” (2005), “Lunar Legend” (2010), containing direct or indirect indications of the presence of “urban” semantics in the title, at the level of motive-shaped structure or in subtext. It was found that the “urban text” in the lyrics of the Evenk poetess is represented both by concrete cultural and historical realities, and by a certain conventional topos, not tied either to time or space. The poets of the Silver Age, belonging to different literary trends, became the creative guidelines for the author. It is proved that V. Danilova created a unique author’s model of the “urban text”, in which symbolist, acmeistic and futuristic poetic experiences and national-cultural vision, conditioned by the ethnic authenticity of the author, were intertwined
Effects of plasma exchange on complement-mediated solubilization of circulating immune complexes in patients with systemic lupus erythematosus
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Dental education challenges during the covid-19 pandemic period in italy: Undergraduate student feedback, future perspectives, and the needs of teaching strategies for professional development
No full textThe COVID-19 pandemic literally stopped most human movement and activities as it initially spread, which included dental practices and dental education. This defined the need for significative changes in teaching and learning with the use of “e-learning” methods, also for traineeships. This study was designed to determine the undergraduate student perception of these new methods as part of their education. This involved 353 students attending the Dental School of the G. D’Annunzio University of Chieti–Pescara, from the first to the sixth years. A questionnaire in Italian and was set-up using “Google Forms” and sent by email to the students. The questionnaire was divided into three parts: the first part included questions for general information, including age, sex and year of course; the second part had multiple choice questions related to their evaluation of the e-learning teaching, using a scale of opinion in the replies to each question (e.g., “scarce”, “fair”, “satisfying”, “very good” and “excellent”); and the third part included two open questions to indicate the strengths and limitations of these new teaching and learning approaches. The categorical variables in the first and second parts of the questionnaire were evaluated using Chi squared tests, setting significance at p < 0.05, while the comments were evaluated qualitatively. The student feedback showed significant appreciation (p < 0.05) of the new methods and the efforts that the lecturers put in to provide lectures of as high a quality as possible. However, a lack of practical training was significantly perceived as an important problem in the structure of their new curriculum (p < 0.05). COVID-19 has been an epic tragedy that has hit the human population not only in terms of health and healthcare, but also quality of life. This includes the quality of dental education within universities. However, the pandemic can be seen to also represent motivation to invest in the necessary technological innovation to deliver the best possible education to our future dentists
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