Search results for "Leche"
showing 10 items of 37 documents
Wet-nurses in the ABC newspaper (1903-1920)
2017
espanolEn el proceso de alimentacion infantil a lo largo de la historia una de las opciones ha sido la descarga en las nodrizas tanto a nivel familiar como institucional. Esta figura social se ha reflejado en la prensa y puede ser estudiada en funcion de su representacion. Nos planteamos como objetivo adquirir una vision social a traves del analisis de un corpus de documentos del diario ABC de Madrid entre los anos 1903 a 1920. Metodologicamente se ha recurrido a la revision y analisis de contenido del diario ABC en el periodo indicado de las noticias, anuncios y demas referencias del termino nodriza. Se han recuperado y analizado 999 documentos, que se corresponden al 41% corresponden a of…
Los expósitos y su representación en “La Gazeta de Madrid”
2016
La existencia de diarios oficiales permite a los Estados informar de la actividad legislativa y administrativa. Diferentes estudios han utilizado estos boletines para analizar la información sociosanitaria de un momento histórico determinado. Nos planteamos como objetivo valorar la evolución de las referencias respecto a los expósitos y su relación con las nodrizas en la “Gazeta de Madrid”, permitiendo la categorización en función de los aspectos tratados. Se plantea la revisión y análisis de contenido de las 130 referencias aparecidas entre 1751 y 1926 que cumplían los criterios establecidos. Tras la lectura, transcripción, cumplimentación y categorización de la información recopilada se r…
Mechanical and thermal behaviour of networks with “flexible” and “rigid” chains
1996
“Rigid-rod” telechelics were synthesized via repetitive Diels-Alder reaction of biscyclohexadienes and bis(1,2,4-triazoline-3,5-diones). The bistriazolinediones were used in slight excess. The rigidity of the building blocks and the molecular weight were varied. Various amounts of these reactive telechelics are used to crosslink cis-1,4-polybutadiene. The mechanical and the thermal properties of these two-component networks were investigated by stress-strain, differential scanning calorimetry and dynamic-mechanical measurements. The occurrence of microphase separation between the “rigid” and the “flexible” components is discussed to explain the properties of these materials.
“Functional Poly(ethylene glycol)”: PEG-Based Random Copolymers with 1,2-Diol Side Chains and Terminal Amino Functionality
2010
A series of poly(ethylene glycol-co-isopropylidene glyceryl glycidyl ether) (P(EO-co-IGG)) random copolymers with different fractions of 1,2-isopropylidene glyceryl glycidyl ether (IGG) units was synthesized. After acidic hydrolysis a new type of "functional PEGs", namely poly(ethylene glycol-co-glyceryl glycerol) (P(EO-co-GG)) was obtained. Using an initiator that releases a terminal amino moiety after deprotection, functional end groups with orthogonal reactivity to the in-chain groups were obtained. All polymers showed narrow molecular weight distributions (1.07-1.19), and control of the molecular weights was achieved in the range 5000-30 000 g/mol. Random incorporation of both comonomer…
Synthesis of linear and three-arm star tert-chlorine-telechelic polyisobutylenes by a two-step conventional laboratory process
1997
A two-step conventional laboratory process was developed for the synthesis of mono- and difunctional linear and three-arm star tert-chlorine-telechelic polyisobutylenes (PIB) with desired molecular weights (MW) and narrow molecular weight distribution (MWD) by living carbocationic polymerization (LCCP). This polymerization method applies easy to handle operations and chemicals. LCCP of isobutylene (IB), was carried out in CH2Cl2 as solvent and with BCl3 as coinitiator in the first step to obtain soluble low MW PIB prepolymer with narrow MWD. This was followed by addition of hexane, TiCl4 and additional monomer in the second step to prepare PIBs with desired MW and narrow MWD in practically …
Endfunctional Polymers by Functionalization of Living Cationic Chain Ends with 1,1-Diphenylethylene
1995
Abstract A new functionalization method has been developed for the synthesis of 2,2-diphenylvinyl(DPV)-telechelic polyisobutylene (PIB). First, living carbocationic polymerization (LCCP) of isobutylene (IB) is quantitatively end-quenched with a nonpolymerizable olefin, 1,1-diphenylethylene (DPE). This process yields a mixture of diphenyl substituted vinyl and tertiary chlorine endgroups. Treatment of the resulting polymer with potassium-tert-butoxide (tBuOK) leads to the quantitative formation of DPV-telechelic PIB which is a potential macroinitiator precursor for living anionic polymerizations.
Determinación del colesterol en leche humana: una alternativa a los métodos cromatográficos
2015
Introduction: human milk (HM) is considered the best option for feeding healthy infants. Cholesterol (CHOL) is important for proper development of the nervous system, and for hormone and vitamin synthesis in growing infants. Breastfeeding and dietary CHOL intake during infancy have been suggested to affect blood lipid levels and the risk of cardiovascular disease in adulthood. Gas chromatography is the technique most widely used to determine CHOL in HM. Chromatographic methods are specific for the determination of CHOL and other sterols present in HM, but are extremely time consuming, and the costs and equipment requirements mean that they are not accessible to all laboratories. Aim: the pr…
Modos de Beber
2014
Associations of the MCM6-rs3754686 proxy for milk intake in Mediterranean and American populations with cardiovascular biomarkers, disease and mortal…
2016
Controversy persists on the association between dairy products, especially milk, and cardiovascular diseases (CVD). Genetic proxies may improve dairy intake estimations, and clarify diet-disease relationships through Mendelian randomization. We meta-analytically (n T (nonpersistence>persistence), dairy intake, and CVD biomarkers in American (Hispanics, African-American and Whites) and Mediterranean populations. Moreover, we analyzed longitudinal associations with milk, CVD and mortality in PREDIMED), a randomized Mediterranean diet (MedDiet) intervention trial (n = 7185). The MCM6-rs3754686/MCM6-rs309180 (as proxy), LP-allele (T) was strongly associated with higher milk intake, but inconsis…
Capacidad protectora de la leche materna frente a las infecciones por norovirus
2012
En la actualidad se asume que la leche materna es el alimento de elección para el lactante hasta los seis meses de vida, recomendándose que se ofrezca más allá de este periodo junto con la alimentación complementaria. Las ventajas nutricionales de la lactancia materna han sido ampliamente estudiadas, si bien son menos conocidas sus propiedades defensivas. La capacidad protectora frente a la adquisición de infecciones es una propiedad que ofrece un gran beneficio al niño amamantado, especialmente frente a las infecciones producidas por norovirus (causa frecuente de infección intestinal en la infancia). Entre los efectores de esta función defensiva parecen estar implicados agentes de inmunida…