Evaluación de la Conservación de la Colección Sabater Pi en la Biblioteca de la Universitat de Barcelona

El objetivo de la evaluación de la Colección Sabater Pi, deriva del hecho de que este fondo se encuentre depositado en estos momento en el edificio de la Biblioteca de Bellas Artes, ocupando dos salas y un pequeño almacén, compartiendo un espacio que consideramos no es el más adecuado para una conservación ideal: entorno urbano, enclave, situación, espacio, almacenaje, clasificación, etc. La colección está dividida en varias tipologías: libros, dibujos, manuscritos, revistas, fotografías, diapositivas, videos, objetos etnológico, objetos de zoología, todas ellas reunidas en un espacio que consideramos no cumplen las normas establecidas para la exposición o exhibición y el almacenaje ideal de los fondos. Abría que añadir el hecho de que este mismo lugar se llevan a cabo tareas de clasificación, administración y consulta de los fondos por investigadores. También acoge de vez en cuando vistas guiadas de grupos de escolares, atraídos por el hecho de que el fundador de esta colección, el Sr. Jordi Sabater Pi, fuese el descubridor del gorila albino, “Copito de Nieve” que durante muchos años fue considerado como un icono de la ciudad de Barcelona. El interés radicaría el estar formado por un conjunto diverso, guardado en un espacio común y en unas condiciones poco apropiadas. Debido a que recientemente se han presentado algunos problemas en los fondos en cuanto a su conservación, consideramos la ocasión muy propicia para realizar esta Evaluación del Estado de Conservación aplicado a un caso real y en este momento de especial interés.

How are riparian plants distributed along the riverbank topographic gradient in Mediterranean rivers? Application to minimally altered river stretches in Southern Spain.

Species structure and composition in Mediterranean riparian forests are determined by hydrological features, longitudinal zonation, and riverbank topography. This study assesses the distribution of four native riparian plants along the riverbank topographic gradient in three river stretches in southern Spain, with special emphasis on the occupation of adult and young feet of each species. The studied stretches suffered minimal human disturbances, displayed semi-arid conditions, and had wide riparian areas to allow the development of the target species: black alder (Alnus glutinosa), salvia leaf willow (Salix salviifolia), narrow-leafed ash (Fraxinus angustifolia), and oleander (Nerium oleander). Thalweg height was used to define the riverbank topographic gradient. The results showed a preferential zone for black alder and salvia leaf willow in the range of 0-150 cm from the channel thalweg, with adult alders and willows being more common between 51 and 150 cm and young alders being more common under 50 cm. Conversely, narrow-leafed ash and oleander were much more frequent, and showed greater development, in the ranges of 151-200 cm and 201-250 cm, respectively, whereas the young feet of both species covered the entire topographic range. Adult feet of the four species were spatially segregated along the riverbank topographic gradient, indicating their differential ability to cope with water stress from the non-tolerant alders and willows to more tolerant narrow-leafed ash trees and oleanders. Young feet, however, showed a strategy more closely linked to the initial availability of colonisation sites within riparian areas to the dispersion strategy of each species and to the distribution of adult feet. In Mediterranean areas, where riparian management has traditionally faced great challenges, the incorporation of species preferences along riverbank gradients could improve the performance of restoration projects.

Brook Trout Removal as a Conservation Tool to Restore Eagle Lake Rainbow Trout

Nonnative brook trout Salvelinus fontinalis are abundant in Pine Creek and its main tributary, Bogard Spring Creek, California. These creeks historically provided the most spawning and rearing habitat for endemic Eagle Lake rainbow trout Oncorhynchus mykiss aquilarum. Three-pass electrofishing removal was conducted in 2007–2009 over the entire 2.8-km length of Bogard Spring Creek to determine whether brook trout removal was a feasible restoration tool and to document the life history characteristics of brook trout in a California meadow stream. After the first 2 years of removal, brook trout density and biomass were severely reduced from 15,803 to 1,192 fish/ha and from 277 to 31 kg/ha, respectively. Average removal efficiency was 92–97%, and most of the remaining fish were removed in the third year. The lack of a decrease in age-0 brook trout abundance between 2007 and 2008 after the removal of more than 4,000 adults in 2007 suggests compensatory reproduction of mature fish that survived and higher survival of age-0 fish. However, recruitment was greatly reduced after 2 years of removal and is likely to be even more depressed after the third year of removal assuming that immigration of fish from outside the creek continues to be minimal. Brook trout condition, growth, and fecundity indicated a stunted population at the start of the study, but all three features increased significantly every year, demonstrating compensatory effects. Although highly labor intensive, the use of electrofishing to eradicate brook trout may be feasible in Bogard Spring Creek and similar small streams if removal and monitoring are continued annually and if other control measures (e.g., construction of barriers) are implemented. Our evidence shows that if brook trout control measures continue and if only Eagle Lake rainbow trout are allowed access to the creek, then a self-sustaining population ofEagle Lake rainbow trout can become reestablished

GLUT2-mediated glucose uptake and availability are required for embryonic brain development in zebrafish

Glucose transporter 2 (GLUT2; gene name SLC2A2) has a key role in the regulation of glucose dynamics in organs central to metabolism. Although GLUT2 has been studied in the context of its participation in peripheral and central glucose sensing, its role in the brain is not well understood. To decipher the role of GLUT2 in brain development, we knocked down slc2a2 (glut2), the functional ortholog of human GLUT2, in zebrafish. Abrogation of glut2 led to defective brain organogenesis, reduced glucose uptake and increased programmed cell death in the brain. Coinciding with the observed localization of glut2 expression in the zebrafish hindbrain, glut2 deficiency affected the development of neural progenitor cells expressing the proneural genes atoh1b and ptf1a but not those expressing neurod. Specificity of the morphant phenotype was demonstrated by the restoration of brain organogenesis, whole-embryo glucose uptake, brain apoptosis, and expression of proneural markers in rescue experiments. These results indicate that glut2 has an essential role during brain development by facilitating the uptake and availability of glucose and support the involvement of glut2 in brain glucose sensing.

Brain Computer Interface for Virtual Reality Control

A brain-computer interface (BCI) is a new communication channel between the human brain and a computer. Applications of BCI systems comprise the restoration of movements, communication and environmental control. In this study experiments were made that used the BCI system to control or to navigate in virtual environments (VE) just by thoughts. BCI experiments for navigation in VR were conducted so far with synchronous BCI and asynchronous BCI systems. The synchronous BCI analyzes the EEG patterns in a predefined time window and has 2 to 3 degrees of freedom.

Frontal gòtic de Sant Llorenç de Morunys. Estudi del suport de fusta: tècnica de construcció i estat de conservació

Estudi preliminar realitzat a partir de la inspecció visual d’un frontal d’altar a les sales de reserva del Museu Diocesà i Comarcal de Solsona, lloc on es custodien les restes del que fou aquesta magnífica obra policromada de tombants del segle XIII executada en l’àmbit del bisbat d’Urgell. Avui en dia, la capa pictòrica ofereix un precari estat de conservació, però encara es conserven els estats preparatoris i una gran part del suport ligni. Les dades per a l’elaboració d’aquest estudi han estat recollides en diferents visites al museu durant els anys 2008-09. El suport del frontal de Sant Llorenç, de fusta de conífera, està constituït per quatre llargues posts disposades en sentit horitzontal que formen un plafó perfectament encaixat dins un marc que, en origen, tancava el conjunt. Actualment, les parts superior i inferior d’aquest marc no existeixen, degut a les nombroses vicissituds sofertes per l’obra al llarg del temps.L’encadellat de totes les peces es resolgué mitjançant espigues o clavilles de fusta, no detectant-se cap unió amb elements metàl·lics. Observant el revers del frontal amb llum rasant, s’aprecien les marques de l’eina que va desgruixar la superfície del suport, l’aixa. Pel sentit dels senyals deixats en la fusta, sembla que cada post va ser desbastada per separat. Després s’uniformaren els gruixos de cadascuna, tot passant un ribot per la zona que toca els cantells i es rebaixà la fusta tocant al perímetre del plafó per a facilitar l’encadellat del marc. Les labors de rebaix i allisat es durien a terme un cop el panell ja estava muntat. L’estat de conservació del suport ligni no és bo. La mancança de les peces superior i inferior del marc afecten l’estabilitat del conjunt que, al no quedar ben travat, acusa certs moviments de les peces amb les manipulacions i els trasllats, moviments que es transmeten també als estrats superiors, portadors de l’escassa policromia. Pel revers de l’obra es poden observar diverses pèrdues, de més o menys entitat, ocasionades per un antic i agressiu atac de xilòfags, de greus conseqüències per l’estructura lígnia, ja que ha debilitat molt les zones perimetrals del frontal, fent-les esdevenir poroses i fràgils.

La Conservació dels murals de la capella de Sant Miquel del Reial Monestir de Santa Maria de Pedralbes

Quan l'abadessa del monestir de Pedralbes estableix en el contracte de Ferrer Bassa que els murals de la capella de Sant Miquel es facin a l'oli segurament fa referència a una tècnica pictòrica consistent a aglutinar els pigments amb oli i a la seva aplicació damunt d'una capa prèvia feta a base de blanc de plom. Però la tècnica que ens trobem no és aquesta: si bé s'utilitza l'oli, s'empren altres aglutinants proteics i resines terpèniques, essent la fase prèvia una pintura al fresc. Els murals estan pintats al fresc i al sec gairabé en la mateixa proporció,i la distribució dels dos procediments està perfectament planificada abans de començar a pintar. També està previst fer la profusa decoració amb daurats i platejats. Els principals problemes de conservació són es inherents a la utilització d'aglutinants orgànics. La tècnica executiva és l'element que més ha condicionat la conservació dels murals, mentre que l'ambient estable de la capella i la seva ubicació han permès que aquest cicle pictòric hagi superat prop de set-cents anys d'història en un estat molt intacte i complet.

El Palacio de Qasr ibn Wardan (Siria) y la evolución de la arquitectura palacial bizantina (siglos VI-XV)

El palacio conocido con el nombre de Qasr ibn Wardan se encuentra hoy día en el interior de la zona esteparia siria. Aunque nosotros nos vamos a centrar en el palacio en sí, en realidad es un complejo de edificios que también incluye una iglesia y un posible cuartel. Aparte del alto grado de conservación, su importancia radica en ser uno de los pocos ejemplos de arquitectura civil de época justinianea en todo Oriente Próximo. Redescubierto a finales del siglo xix, el palacio ha sido estudiado parcialmente desde entonces. Gracias a los trabajos de restauración llevados a cabo entre las décadas de 1970 y 1990, se pudieron volver a estudiar los restos, destacando en ello la obra de F. De’Maffei publicada en 1995. Nuestro trabajo pretende retomar el estudio de este edificio, ofrecer una restitución en 3D para una mejor comprensión de sus fases edilicias y plantear nuevas hipótesis acerca de las motivaciones que llevaron a su construcción a partir del año 561.

Xarxa RESTAURO. Projecte d'una plataforma per a la comunicació en I'ambit de la Conservació-Restauració a Catalunya

La restauració és una disciplina que moltes vegades es caracteritza per saber incorporar noves tècniquesi solucions basades en les innovacions que es produeixen en altres sectors més o menys afins, des dela medicina, fins a les ciències experimentals, la informàtica o I'enginyeria, entre tantes d'altres.Aquesta capacitat desacomplexada de treballar de manera interdisciplinar amb altres professionalssol ser pal de palier de I'ideari de la restauració, contribuint en gran mesura al seu creixement i a larecerca de noves tècniques i solucions.Tot i això, potser la comunicació i difusió de les intervencions de restauració sigui un dels àmbitsen els quals tinguem més camp per recórrer, per tal d'aconseguir obrir la restauració i els seusconeixements al públic general. Un treball costós que s'ha d'abordar transversalment però que ens pot oferir la complicitat i el recolzament social que requereix una professió que treballa amb el patrimoni col·lectiu . Ja que com a custodis de I'art, potser també tinguem un deure envers el retorn d'aquest a la societat.Amb aquest projecte s'analitza aquesta situació específica i es pretén oferir una proposta de plataforma on-line per difondre i promoure les intervencions de restauració en tot l'àmbit català, segons el context i les oportunitats actuals.D'aquesta manera, la xarxa RESTAURO busca promoure I'accés i la difusió de les intervencions de conservació i restauració que es realitzen sobre el patrimoni moble català per tal d'aprofundir en lavivència i el coneixement del mate ix per part del públic general.No satisfà donar una imatge estàtica i finalitzada del patrimoni, sinó que es vol que el ciutadà puguiconèixer la importància de les tasques de restauració i conservació en I'apreciació dels monuments o obres d'art i la seva imatge actual.

Looking beneath Dalí's paint: non-destructive canvas analysis

A new analytical method was developed to non-destructively determine pH and degree of polymerisation (DP) of cellulose in fibres in 19th 20th century painting canvases, and to identify the fibre type: cotton, linen, hemp, ramie or jute. The method is based on NIR spectroscopy and multivariate data analysis, while for calibration and validation a reference collection of 199 historical canvas samples was used. The reference collection was analysed destructively using microscopy and chemical analytical methods. Partial least squares regression was used to build quantitative methods to determine pH and DP, and linear discriminant analysis was used to determine the fibre type. To interpret the obtained chemical information, an expert assessment panel developed a categorisation system to discriminate between canvases that may not be fit to withstand excessive mechanical stress, e.g. transportation. The limiting DP for this category was found to be 600. With the new method and categorisation system, canvases of 12 Dalí paintings from the Fundació Gala-Salvador Dalí (Figueres, Spain) were non-destructively analysed for pH, DP and fibre type, and their fitness determined, which informs conservation recommendations. The study demonstrates that collection-wide canvas condition surveys can be performed efficiently and non-destructively, which could significantly improve collection management.

Expressional regulation of key hepatic enzymes of intermediary metabolism in European seabass (Dicentrarchus labrax) during food deprivation and refeeding

We hypothesized that the analysis of mRNA level and activity of key enzymes in amino acid and carbohydrate metabolism in a feeding/fasting/refeeding setting could improve our understanding of how a carnivorous fish, like the European seabass (Dicentrarchus labrax), responds to changes in dietary intake at the hepatic level. To this end cDNA fragments encoding genes for cytosolic and mitochondrial alanine aminotransferase (cALT; mALT), pyruvate kinase (PK), glucose 6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) were cloned and sequenced. Measurement of mRNA levels through quantitative real-time PCR performed in livers of fasted seabass revealed a significant increase in cALT (8.5-fold induction)while promoting a drastic 45-fold down-regulation of PK in relation to the levels found in fed seabass. These observations were corroborated by enzyme activity meaning that during food deprivation an increase in the capacity of pyruvate generation happened via alanine to offset the reduction in pyruvate derived via glycolysis. After a 3-day refeeding period cALT returned to control levels while PK was not able to rebound. No alterations were detected in the expression levels of G6PDH while 6PGDH was revealed to be more sensitive specially to fasting, as confirmed by a significant 5.7-fold decrease in mRNA levels with no recovery after refeeding. Our results indicate that in early stages of refeeding, the liver prioritized the restoration of systemic normoglycemia and replenishment of hepatic glycogen. In a later stage, once regular feeding is re-established, dietary fuel may then be channeled to glycolysis and de novo lipogenesis.

Expressional regulation of key hepatic enzymes of intermediary metabolism in European seabass (Dicentrarchus labrax) during food deprivation and refeeding

We hypothesized that the analysis of mRNA level and activity of key enzymes in amino acid and carbohydrate metabolism in a feeding/fasting/refeeding setting could improve our understanding of how a carnivorous fish, like the European seabass (Dicentrarchus labrax), responds to changes in dietary intake at the hepatic level. To this end cDNA fragments encoding genes for cytosolic and mitochondrial alanine aminotransferase (cALT; mALT), pyruvate kinase (PK), glucose 6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) were cloned and sequenced. Measurement of mRNA levels through quantitative real-time PCR performed in livers of fasted seabass revealed a significant increase in cALT (8.5-fold induction)while promoting a drastic 45-fold down-regulation of PK in relation to the levels found in fed seabass. These observations were corroborated by enzyme activity meaning that during food deprivation an increase in the capacity of pyruvate generation happened via alanine to offset the reduction in pyruvate derived via glycolysis. After a 3-day refeeding period cALT returned to control levels while PK was not able to rebound. No alterations were detected in the expression levels of G6PDH while 6PGDH was revealed to be more sensitive specially to fasting, as confirmed by a significant 5.7-fold decrease in mRNA levels with no recovery after refeeding. Our results indicate that in early stages of refeeding, the liver prioritized the restoration of systemic normoglycemia and replenishment of hepatic glycogen. In a later stage, once regular feeding is re-established, dietary fuel may then be channeled to glycolysis and de novo lipogenesis.

Efeito da variação de parâmetros reacionais na preparação de grafeno via oxidação e redução do grafite

This work shows the influence of several reactional parameters for obtaining graphene through successive steps of oxidation and exfoliation of bulk graphite (resulting in graphene oxide), followed by chemical reduction. The results showed that changes in temperature, reaction time, reducing agent and source of primary graphite lead to different surface compositions and stability in dispersion of graphene oxide. Also, the use of different reducing agents promoted different degrees of restoration of C=C bonds in the bidimensional structure of graphene.

Kampen for livet i vemodets slør : å leve i spenningsfeltet mellom livets mulighet og dødens nødvendighet

The overallpurpose of this research is to develop knowledge about health and suffering in connection with serious cancer disease through the development of a contextual model describing how patients live their lives between the possibility of life and the necessity of death. The research takes its point of departure from a caring science perspective, and Gadamer's hermeneutical philosophy is chosen as the overall methodology. In addition to the caring science perspective, the existential philosophy of Kierkegaard constructs a framework of interpretation. The research consists of three empirical studies. In two of the studies 21 patients participated, whilst 8 nurses took part in the remaining study. The patients were seriously ill and the nurses had long experience of caring for seriously ill patients. Scientific conversations were used for data collection. The findings from the patient studies show that the relationship with one-self, others, God or the supernatural and nature, constitute the unit of meaning, in which the struggle between health and suffering takes place. This struggle takes the form of a dialectic movement between being delivered and being accommodated and confirmed. The patients strive, in their delivery, for health and integration, for being a self by being reconciled with one self. The patients are lonely in this struggle, as conversations related to existence and death seldom occurs with either the natural or the professional caregivers. Themes related to patients' death remain mainly unarticulated. The patients' life struggle appears on the existential level as a threefold struggle against time and annihilation, towards being accommodatedand confirmed and for restoration and reconciliation. Through the hermeneutic process the struggle at the ontological level appears as a struggle of the will between anxiety and love. The patients in this research experience their life's tragedy. A holistic interpretation of living under the pressure created between the possibility of life and the necessity of death appears to be a struggle for life in the veil of pensiveness. The nurses want to be involved in the patients' struggle, and they show a deep desire to support the dignity of the patients. The depth in the nurses' view of their responsibility for the patient as an entityof body, soul and spirit seems to be related to the nurses' understanding of life.

Natural regeneration in abandoned fields following intensive agricultural land use in an Atlantic Forest Island, Brazil

The time required to regrowth a forest in degraded areas depends on how the forest is removed and on the type of land use following removal. Natural regeneration was studied in abandoned old fields after intensive agricultural land use in areas originally covered by Brazilian Atlantic Forests of the Anchieta Island, Brazil in order to understand how plant communities reassemble following human disturbances as well as to determine suitable strategies of forest restoration. The fields were classified into three vegetation types according to the dominant plant species in: 1) Miconia albicans (Sw.) Triana (Melastomataceae) fields, 2) Dicranopteris flexuosa (Schrader) Underw. (Gleicheniaceae) thickets, and 3) Gleichenella pectinata (Willd.) Ching. (Gleicheniaceae) thickets. Both composition and structure of natural regeneration were compared among the three dominant vegetation types by establishing randomly three plots of 1 x 3 m in five sites of the island. A gradient in composition and abundance of species in natural regeneration could be observed along vegetation types from Dicranopteris fern thickets to Miconia fields. The gradient did not accurately follow the pattern of spatial distribution of the three dominant vegetation types in the island regarding their proximity of the remnant forests. A complex association of biotic and abiotic factors seems to be affecting the seedling recruitment and establishment in the study plots. The lowest plant regeneration found in Dicranopteris and Gleichenella thickets suggests that the ferns inhibit the recruitment of woody and herbaceous species. Otherwise, we could not distinguish different patterns of tree regeneration among the three vegetation types. Our results showed that forest recovery following severe anthropogenic disturbances is not direct, predictable or even achievable on its own. Appropriated actions and methods such as fern removal, planting ground covers, and enrichment planting with tree species were suggested in order to restore the natural forest regeneration process in the abandoned old fields.