521 research outputs found

    Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

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    Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present in the adsorbent material on its adsorption capacity was noted. Sorption capacity of these selected materials was found to depend on the time of use, their surface area, and pore distribution. A conformation to the most well-known adsorption isotherm models, Langmuir, and Freundlich ones, confirms the formation of mono- and heterolayer solute (phenol) coverage on the surface of the adsorbent applied herein. The materials proposed as adsorbents of the aqueous solution contaminants were proved effective, which means that the waste materials considered are promising activated carbon precursors for liquid phase adsorbents for the environmental protection

    Daphniola Radoman, 1973 (Caenogastropoda: Truncatelloidea) at east Aegean Islands

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    Shell habitus and COI mitochondrial gene sequences of one freshwater snail from Khios and three from Rhodes islands were analysed. Both methods confirmed assignment of these specimens to the genus Daphniola Radoman, 1973. Genetic distance between individuals from these two islands is surprisingly low, strongly suggesting that they belong to the same species, still undescribed. Comparison of COI sequences with other known species of this genus shows that the closest relative of the Khios and Rhodes populations is D. louisi Falniowski et Szarowska, 2000 from Attica. The results are discussed in the context of geological and climatic history of the Mediterranean

    Pseudorientalia Radoman, 1973 (Caenogastropoda: Rissooidea) on Samos Island, Aegean Sea

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    Pseudorientalia Radoman, 1973 is recorded from the Samos Island (East Aegean Islands). The genus was previously known from northern Turkey. The shells, protoconch, radula, penis, and female reproductive organs are described. All the morphological data confirm that the specimens belong to the genus Pseudorientalia, but for the moment its identity with P. natolica (KĂŒster, 1852) from Turkey cannot be confirmed. Molecular data (mitochondrial cytochrome oxidase subunit I and nuclear 18S rRNA gene partial sequences) confirm the genus-level distinctness of Pseudorientalia, and its sister clade consists of Grossuana Radoman, 1973, Trichonia Radoman, 1973, and Daphniola Radoman, 1973

    Article ID 297654

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    Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present in the adsorbent material on its adsorption capacity was noted. Sorption capacity of these selected materials was found to depend on the time of use, their surface area, and pore distribution. A conformation to the most well-known adsorption isotherm models, Langmuir, and Freundlich ones, confirms the formation of mono-and heterolayer solute (phenol) coverage on the surface of the adsorbent applied herein. The materials proposed as adsorbents of the aqueous solution contaminants were proved effective, which means that the waste materials considered are promising activated carbon precursors for liquid phase adsorbents for the environmental protection

    Nowotworowe zapalenie opon mózgowo-rdzeniowych — opis dwóch przypadków

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    Do zajęcia opon mĂłzgowo-rdzeniowych, okreƛlanego rĂłwnieĆŒ jako meningoza lub karcynomatoza opon, dochodzi u 5–8% pacjentĂłw z chorobami nowotworowymi. Przerzuty do opon miękkich występują w przebiegu zƂoƛliwych nowotworĂłw ukƂadu krwiotwĂłrczego,raka sutka, raka pƂuca, czerniaka i gruczolakorakĂłw przewodu pokarmowego. Meningoza przebiega pod postacią rakowatoƛci opon i rdzenia kręgowego lub nowotworowego zapalenia opon mĂłzgowo-rdzeniowych, ktĂłre rĂłĆŒnią się przebiegiem klinicznymi rokowaniem. Charakterystyczną cechą nowotworowego zapalenia opon mĂłzgowo-rdzeniowych jest jednoczesne, wielopoziomowe występowanie objawĂłw klinicznych wynikających z zajęcia kilku obszarĂłw ukƂadu nerwowego. ƚredni czas przeĆŒycia pacjentĂłw z nowotworowym zapaleniem opon mĂłzgowo-rdzeniowych wynosi 4–11 tygodni. Mimo postępu diagnostyki i leczenia onkologicznego w ostatnich kilkudziesięciu latach czas ten nie ulegƂ wydƂuĆŒeniu. Autorzy przedstawili opisy dwĂłch pacjentĂłw z nowotworowym zapaleniem opon mĂłzgowo-rdzeniowych (w przebiegu czerniaka i raka pƂuca)

    Idiopatyczne nadciƛnienie ƛródczaszkowe u mƂodej kobiety bez nadwagi

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    Idiopatyczne nadciƛnienie ƛrĂłdczaszkowe to stan charakteryzującysię wzmoĆŒonym ciƛnieniem prawidƂowego pƂynu mĂłzgowo-rdzeniowego(> 250 mm H2O), ktĂłremu nie towarzyszy inny procespatologiczny toczący się w ukƂadzie nerwowym lub poza nim.W rozwaĆŒaniach nad patogenezą schorzenia bierze się pod uwagęmiędzy innymi rolę ĆŒeƄskich hormonĂłw pƂciowych, otyƂoƛci,nadkrzepliwoƛci krwi oraz zaburzeƄ krÄ…ĆŒenia pƂynu mĂłzgowo--rdzeniowego. Większoƛć chorych z idiopatycznym nadciƛnieniemƛrĂłdczaszkowym skarĆŒy się na obustronny bĂłl gƂowy. Podstawowym,obiektywnym objawem schorzenia jest obrzęk tarcz nerwĂłwwzrokowych, ktĂłry w przypadku dƂugotrwaƂego utrzymywaniasię prowadzi do uszkodzenia nerwĂłw wzrokowych i zaburzeƄwidzenia. Dlatego konieczna jest regularna kontrola okulistycznaz oceną dna oka, badaniem ostroƛci wzroku, pola widzeniai rozrĂłĆŒniania barw. Leczenie idiopatycznego nadciƛnienia ƛrĂłdczaszkowegoobejmuje redukcję masy ciaƂa, stosowanie lekĂłwzmniejszających wytwarzanie pƂynu mĂłzgowo-rdzeniowego orazpostępowanie neurochirurgiczne. Autorzy przedstawiają mƂodąchorą bez nadwagi z przygodnie rozpoznanym idiopatycznymnadciƛnieniem ƛrĂłdczaszkowym

    Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV

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    Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript −1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio
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