Search results for "amina"
showing 10 items of 2711 documents
Skin surveillance attitudes and behaviors in relation to skin checks for early signs of skin cancer in a sample of secondary school students and teac…
2012
<p><strong>Background</strong>: Malignant melanoma (MM) can be readily treated in its earliest stages: survival rate, when detected early, is up to 95,0%. This justifies investigations on contributive factors and measures for precocious detection of skin tumors to improve early detection and to increase survival rates. The purpose of this survey was to collect information about knowledge, attitudes and behaviors on prevention in relation to skin checks for early signs of skin cancer on a sample of secondary school students and teachers.</p><p><strong>Methods</strong>: A sample of secondary school students and teachers from Palermo, was recruited usi…
Two-dimensional materials: from hybrid magnetic multilayers to superconducting single layers
2013
El trabajo descrito en esta tesis se encuadra en el ámbito de los materiales laminares con propiedades magnéticas de interés empleados como sistemas químicamente versátiles. En cuanto a su versatilidad química, los materiales laminares constituyen un ejemplo clásico de lo que se denomina una estructura anfitrión, capaz de albergar por intercalación otras especies químicas en su interior de forma mas o menos ordenada. Dos son las familias de compuestos estudiadas en este trabajo: los hidróxidos dobles laminares (layered double hydroxides, LDHs) que exhiben un comportamiento magnético químicamente modulable y los dicalcogenuros de los metales de transición (transition metals dichalcogenides, …
Znaczenie i rola witaminy D w praktyce farmaceutycznej
2022
Pierwsze doniesienia o witaminie D pojawiły się w pierwszej połowie XX w. Jej odkrycie wywarło istotny wpływ na prewencję i leczenie krzywicy, a także umożliwiło poznanie i udokumentowanie roli w regulacji równowagi gospodarki wapniowo-fosforanowej. Dalsze doniesienia sugerują również inne istotne dla zdrowia właściwości witaminy D, w tym wpływ na układ mięśniowy, nerwowy, immunologiczny, krążenia, gospodarkę węglowodanową, otyłość, ryzyko wystąpienia chorób nowotworowych, a także (istotne dziś) zagadnienie wpływu na przebieg i zapadalność na COVID-19. Wyróżniono sześć form witaminy D różniących się strukturą łańcuchów bocznych. Do grupy witaminy D zaliczamy: cholekalcyferol (witamina D3) p…
Reaction of polyamines with diethyloxalate: a convenient route for the synthesis of tetraazacycloalkanes
2006
International audience; The reactivity of various polyamines with diethyloxalate has been investigated. It appears that, in similar experimental conditions, primary diamines give predominantly [2+2] adducts while the use of secondary benzylated polyamines results in [1+1] condensation. Although the intermediate tetraamides formed in the first case are extremely poorly soluble and show very slow reactivity towards reducing agents, cyclam has been obtained by using ultrasounds during the reaction of the corresponding tetraoxomacrocycle with BH 3 /THF. The [1+1] cyclization reaction of diversely N-benzylated linear tetraamines, whose selective syntheses have been devised herein, gives access t…
An Easy Route Towards Regioselectively Difunctionalized Cyclens and New Cryptands.
2006
Reductive amination of various aldehydes with cyclen represents a very convenient method for the synthesis of a wide range of 1,7-difunctionalized cyclens, as well as new cryptands.
Contributions of mean and shape of blood pressure distribution to worldwide trends and variations in raised blood pressure: A pooled analysis of 1018…
2018
Background: Change in the prevalence of raised blood pressure could be due to both shifts in the entire distribution of blood pressure (representing the combined effects of public health interventions and secular trends) and changes in its high-blood-pressure tail (representing successful clinical interventions to control blood pressure in the hypertensive population). Our aim was to quantify the contributions of these two phenomena to the worldwide trends in the prevalence of raised blood pressure. Methods: We pooled 1018 population-based studies with blood pressure measurements on 88.6 million participants from 1985 to 2016. We first calculated mean systolic blood pressure (SBP), mean dia…
Marcadores clínicos y estudio de estilo de vida en el seguimiento de la enfermedad celíaca
2020
La enfermedad celíaca (EC) es un trastorno sistémico, crónico y de origen autoinmune que afecta a individuos genéticamente susceptibles. Se presenta con una gran variedad de signos, síntomas y enfermedades asociadas, incluso también puede cursar de manera asintomática, lo que hace difícil su diagnóstico. La EC se diagnostica con mayor frecuencia en las mujeres y a edades más tempranas que a los hombres. Debido a la gran hererogeneidad en la forma de presentación de la EC, se ha llevado a cabo una revisión sistemática, donde estudios recientes, muestran una variación del espectro clínico de la enfermedad en función de la edad. En niños pequeños predomina la forma clásica con síntomas como di…
Towards Computer-based Exams in CS1
2017
Even though IDEs are often a central tool when learning to program in CS1, many teachers still lean on paper-based exams. In this study, we examine the “test mode effect” in CS1 exams using the Rainfall problem. The test mode was two-phased. Half of the participants started working on the problem with pen and paper, while the other half had access to an IDE. After submitting their solution, all students could rework their solution on an IDE. The experiment was repeated twice during subsequent course instances. The results were mixed. From the marking perspective, there was no statistically significant difference resulting from the mode. However, the students starting with the paper-based pa…
Un’insalata di mescolanza. A proposito de ‘Gli Ingannati’
2012
Monografie di Agathòn. Atti del Symposium East-West Artistic and Technological Contaminations/Oriente-Occidente. Contaminazioni Artistiche e Tecnolog…
2013
AgAthón, the Ph.D.’s journal collecting together the best of the works about the renovation and the enhancement of ancient contexts, has had increasing success among institutions and both Italian and foreign researchers. The choral pattern chosen in the four sectors, which alludes to the Greek city, has certainly contributed to create this appreciation: the Agorá, like the central space in the pólis, for guest contributions; the Stoá, the covered portico under which the philosopher Zeno used to teach his disciples, for the Ph.D. teachers’ contributions; the gymnásion, the place of endeavour for young Greeks training their bodies and minds, is the section meant for the doctoral candidates; l…