Search results for "amina"
showing 10 items of 2711 documents
Sorpcja miedzi w glonach morskich Laminaria ochroleuca bachelot de la pylaie= Sorption of copper in marine algae Laminaria ochroleuca bachelot de la …
2015
Przedmiotem badań było określenie stopnia zanieczyszczenia metalami ciężkimi ekosystemów wodnych, analizując próbki wody oraz osadów dennych zbiorników wód powierzchniowych na terenie parków miejskich rejonu Wałbrzycha. Zawartość metali w wodzie uszeregowano następująco: Zn > Cu > Pb > Ni > Cd. Wody z analizowanych stanowisk badawczych charakteryzowały się podwyższonym stężeniem kadmu, a zbiornik Nowe Miasto dodatkowo znaczącym stężeniem Pb. Koncentracje Cu, Ni oraz Zn nie stanowiły zagrożenia dla funkcjonowania ekosystemów wodnych. Koncentracja metali w osadach dennych stanowiła szereg: Zn > Pb > Cu > Ni > Cd. Badania osadów dennych, pobranych ze zbiorników, nie wykazały znaczącego zaniecz…
Recommendations of the Spanish Working Group on Crohn's Disease and Ulcerative Colitis (GETECCU) on topical therapy in ulcerative colitis
2020
Although most patients with ulcerative colitis should be given topical treatment, different studies have shown that they are underused in clinical practice. The purpose of this article is to answer 10 specific questions about which drugs are available for topical use in the treatment of ulcerative colitis, and their characteristics in terms of formulation, dosage, presentation, application and proximal distribution of rectal-administered drugs. The efficacy of available topical drugs and the benefits of combining different formulations and routes of administration, and their usefulness during disease remission are evaluated. Finally, a series of recommendations addressed to patients are giv…
Reduction-oxidation dynamics of oxidized graphene: Functional group composition dependent path to reduction
2018
Micrometer-sized oxidation patterns containing varying composition of functional groups including epoxy, ether, hydroxyl, carbonyl, carboxyl, were created in chemical vapor deposition grown graphene through scanning probe lithography and pulsed laser two-photon oxidation. The oxidized graphene films were then reduced by a focused x-ray beam. Through in-situ x-ray photoelectron spectroscopy measurement, we found that the path to complete reduction depends critically on the total oxygen coverage and concentration of epoxy and ether groups. Over the threshold concentrations, a complex reduction-oxidation process involving conversion of functional groups of lower binding energy to higher bindin…
Hepatitis C Virus positive patients with persistently normal serum transaminase: a long-term follow-up
2010
Asymmetric Synthesis of Fluorinated Isoindolinones through Palladium-Catalyzed Carbonylative Amination of Enantioenriched Benzylic Carbamates
2015
The asymmetric synthesis of fluorinated isoindolinones has been achieved by a palladium-catalyzed aminocarbonylation reaction of the corresponding -fluoroalkyl o-iodobenzylamines. A base-mediated anti -hydride elimination process was suggested to explain the partial erosion of the optical purity observed in some cases. This mechanistic rationale enabled the minimization of this partial racemization by fine-tuning the pK(a) of the base.
Heteroforiju izmaiņas pēc ilgstošas disociācijas un prizmu adaptācijs testa
2021
Maģistra darbs ir uzrakstīts angļu valodā uz 46 lapām. Tas satur 14 attēlus, 8 tabulas un 80 atsauces uz literatūras avotiem. Mērķis bija izvērtēt verģences adaptācijas ietekmi uz heteroforiju novērtējumu un prizmu adaptācijas testa pielietojumu klīniskajā praksē. Pirmajā daļā 40 dalībniekiem tika novērtētas heteroforija izmaiņas 2 minūšu laikā pēc disociācijas. Otrajā daļā tika novērtēta verģences adaptācija, izmantojot prizmu adaptācijas testu. Rezultāti parādīja, ka heteroforijas lielumu būtiski ietekmē disociācijas ilgums. Dalībniekiem ar diagnosticētu verģences anomāliju novēroja samazinātu verģences adaptāciju. Secinājums: verģences adaptācijai ir nozīmīga ietekme uz heteroforijas nov…
Reducción de la contaminación por hongos toxigénicos y micotoxinas en alimentos mediante el uso de isotiocianatos
2019
El crecimiento de hongos es una de las causas más habituales del deterioro de los alimentos. Productos como los cereales, el pan y sus derivados son especialmente susceptibles ser contaminados con hongos toxigénicos y/o micotoxinas, lo que supone un problema de seguridad alimentaria. Por ello en la presente Tesis Doctoral se han estudiado la presencia de micotoxinas en 60 muestras de masas de pizza refrigeradas y el riesgo de exposición de la población a estos compuestos. Se detectaron aflatoxinas (AFs), zearalenona (ZEA), eniatinas (ENs) y beauvericina (BEA) en el 50, 100, 100 y 3 % respectivamente. Aunque el riesgo de exposición fue moderado, el 12 % de las muestras superaba los límites m…
Prevalence of visual impairment and refractive errors in an urban area of Mexico
2019
AIM: To determine the distribution of refractive errors in a school-age population in Quintana Roo (Mexico) in the framework of an international cooperation campaign for the prevention of blindness. METHODS: A sample of 2647 school-age children (ranging from 5 to 14 years old) with a mean age of 9.1±1.9 years old were tested by trained volunteers for distance visual acuity (VA) and refractive errors. The first screening examination included uncorrected distance visual acuity (UDVA) and VA with a +2.00 D lens. Inclusion criteria for a second complete cycloplegic eye examination performed by an optometrist were UDVA <20/25 (0.10 logMAR or 0.8 decimal) and/or VA with +2.00 D ≥20/25. RESULTS: A…
The seaweeds &lt;i&gt;Fucus vesiculosus&lt;/i&gt; and &lt;i&gt;Ascophyllum nodosum&lt;/i&gt; are significant contribu…
2013
Abstract. Based on the results of a pilot study in 2007, which found high mixing ratios of molecular iodine (I2) above the intertidal macroalgae (seaweed) beds at Mweenish Bay (Ireland), we extended the study to nine different locations in the vicinity of Mace Head Atmospheric Research Station on the west coast of Ireland during a field campaign in 2009. The mean values of I2 mixing ratio found above the macroalgae beds at nine different locations ranged from 104 to 393 ppt, implying a high source strength of I2. Such mixing ratios are sufficient to result in photochemically driven coastal new-particle formation events. Mixing ratios above the Ascophyllum nodosum and Fucus vesiculosus beds …
Microorganisms of food ice cubes and their transfer to drinks
2017
The present work was carried out to investigate the microbiological characteristics of the ice cubes produced at different levels: 1) home-made (HM) from domestic freezers; 2) produced by ice machines in bars and pubs (BP); 3) produced by ice industries (IN). BP samples were collected from the box stocks. HM and BP samples were transferred into sterile stomacher bags. IN samples were provided in the manufacturers’ plastic bags. Samples were transported into thermal insulated boxes. Five samples per each production level, forming a total of 15 samples (HM1-HM5, BP1-BP5, IN1-IN5), were collected in duplicate in two consecutive months. Each ice sample was thawed in 1 L sterile Dhuram’s bottle …