Formation and evolution profiles of anthocyanin derivatives and tannins during fermentations and aging of red wines Berrueta, Luis A.; Rasines Perea, Zuriñe; Prieto Perea, Noelia; Asensio Regalado, Carlos; Alonso Salces, Rosa Maria; Sánchez Ilárduya, María B.; Gallo, Blanca The target of this paper is the study of anthocyanin and tannin extraction from red grape during maceration, the formation of new pigments, and the evolution profiles of anthocyanin derivatives and tannins during the alcoholic and malolactic fermentations and aging in oak barrels and steel vats. 2 anthocyanins, 38 anthocyanin derivatives and 37 tannins were monitored. Formation of all classes of anthocyanin derivatives starts quickly after anthocyanin extraction from grape. Their maximum levels are reached a few days after apex of anthocyanins during maceration/alcoholic fermentation. Indirect condensation derivatives showed less stable behavior than that of the direct flavanol–anthocyanin products during fermentations and aging. Within pyranoanthocyanins, vitisin B had more instability than vitisin A. Extraction of tannins from grape occurs slower than that of anthocyanins. Major tannins are procyanidin homodimers with B bond (45% of total tannins after fermentations), followed by monomers (around 25%) and mixed B dimers (more than 10%). Tannins suffer a general continuous decrease during aging, with increasing relevance of more oxygenated tannins as aging advances. Fermentations are crucial stages in the formation of anthocyanin derivatives. In contrast, aging causes a continuous degradation for nearly all classes of anthocyanin derivatives and tannins, with a more stable behavior for some of them. Thus, establishing with confidence which enological conditions favor each type of derivative during fermentation is an important goal for future research. This work studies many individual compounds, involves exhaustive sampling and covers the different winemaking stages at an industrial winemaking scale, contributing to a more complete vision.

Dissipative majorana quantum wires Huang, Yizhen; Lobos, Alejandro Martin; Cai, Zi In this paper, we formulate and quantitatively examine the effect of dissipation on topological systems. We use a specific model of Kitaev quantum wire with an onsite Ohmic dissipation and perform a numerically exact method to investigate the effect of dissipation on the topological features of the system (e.g., the Majorana edge mode) at zero temperature. We find that even though the topological phase is robust against weak dissipation as it is supposed to be, it will eventually be destroyed by sufficiently strong dissipation via either a continuous quantum phase transition or a crossover depending on the symmetry of the system. The dissipation-driven quantum criticality has also been discussed.

Los sentimientos de culpa frente a la muerte de un par generacional: Testimonios de jóvenes estudiantes de sectores populares; Feelings of guilt in the face of the death of a generational couple: Testimonies of young students from popular sectors Kaplan, Carina Viviana; Arévalos, Darío Hernán El presente artículo se propone interpretar los sentimientos de culpa de jóvenes estudiantes de sectores populares frente a la muerte de un par generacional. La tramitación del sufrimiento está mediada por la red de vínculos intra e inter generacionales.; This article intends to interpret the feelings of guilt of young students from popular sectors in the face of the death of a generational couple. The processing of suffering is mediated by the network of intra and inter generational links.

Mapear coletivamente a ditadura Argentina e seus restos; Mapear colectivamente la dictadura Argentina y sus restos Lopez Piñeyro, Hernán Ignacio Este trabajo se propone realizar una aproximación crítica a las prácticas cartográficas promovidas por grupos artísticos y desarrolladas colaborativamente. Más específicamente, se analiza una acción del Grupo de Arte Callejero, Aquí viven genocidas (2001-2006): una serie mapas de Buenos Aires en los que se indican los domicilios de los genocidas escrachados por distintas organizaciones sociales y cuestiones relativas a la última dictadura militar argentina. Esta cartografía no fue gestada en el atelier de un artista, sino producida a partir de la propuesta de un grupo, en colaboración entre activistas con el fin de tejer redes de afinidad e impulsar prácticas de justicia alternativas.; Este trabalho critica as práticas cartográficas promovidas por grupos artísticos e desenvolvidas de forma colaborativa. Mais especificamente, é analisada neste artigo uma ação do Grupo de Arte Callejero, Aquí viven genocidas (2001-2006): uma série de mapas de Buenos Aires onde são indicados os endereços dos genocidas de forma “escrachada” por diferentes organizações sociais e assuntos relacionados à última ditadura militar argentina. Essa cartografia não foi criada em um atelier de artista, mas nas ruas, e tendo como base a proposta de um grupo, formado pela colaboração entre ativistas, a fim de tecer redes de afinidade e promover práticas alternativas de justiça.

Physicochemical and antioxidant properties of a gastroprotective exopolysaccharide produced by Streptococcus thermophilus CRL1190 Lobo, Rene Emanuel; Gómez, María Inés; Font, Graciela Maria; Torino, Maria Ines The exopolysaccharide EPS1190 was isolated with high purity from skim milk fermented by the strain Streptococcus thermophilus CRL1190, the major EPS amount being recovered at stationary growth-phase (70.7 mg/L after 16 h). This polymer revealed moderate antioxidant activity in vitro and useful technological properties such as good emulsifying and flocculating capacity at low concentrations, high aqueous solubility (9.1 mg/mL), water and oil holding capacity (528.5 % and 1266 %, respectively) as well as thermal behavior. Thermogravimetric, Differential Thermal Analysis and Differential Scanning Calorimetry curves showed that the biopolymer was thermally stable up to 216 °C with a crystalline deformation in an endothermic process (△H = 284.46 J) at a melting temperature of 74.08°C. Furthermore, a degradation temperature (Td) of 295.4 °C was observed. These results postulate that EPS1190 could be used in the food industry due to its special micro-structure (scanning electron microscopy of EPS1190 demonstrated a homogeneous matrix with micro-porous and rough structure), its good performance and functionality in both aqueous and oil systems, which would remain at high temperatures.

Purity and constraints in legal theory. Some remarks on Paulson’s Analysis of the neo-Kantian dimension of Kelsenian theory of law Navarro, Pablo Eugenio Hans Kelsen rejects both natural law theories and fact-based positivism. Rather, following certain ideas inspired by the neo-Kantian philosophy, he attempts to preserve a clear separation between law and facts as well as between law and morality. As it is well-known, Kelsen?s Neo-Kantian ideas are combined with other theses extracted from a positivistic vision of the law. However, as Stanley L. Paulson shows in his very fine paper about the limits of the kelsenian doctrine, Neo-Kantism and positivism cannot be easily articulated in a coherent picture. In particular, Paulson analyses two closely connected problems. On the one hand, the relation between legal interpretation and the ?irregular? creation of norms (i.e., the problem of constraints) and, on the other hand, the limits of purity (i.e., the philosophical problem). In this paper, I will briefly comment on both problems mentioned by Paulson. First, I deal with the philosophical problem and I focus on (i) the distinction between ?Is? and ?Ought? and (ii) the rejection of Natural Law Theories. Second, I analyse the problem of constraints and I pay attention to certain consequences that stem from the validity of irregular norms.

CYP26B1 declines postnatally in Sertoli cells independently of androgen action in the mouse testis Edelsztein, Nadia Yasmín; Kashimada, Kenichi; Schteingart, Helena Fedora; Rey, Rodolfo Alberto Meiosis begins at puberty and relies on several factors, including androgens and retinoic acid in the mouse testis. CYP26B1 degrades retinoic acid in the testis during prenatal development preventing meiosis initiation. Given the concurrence of meiotic entry and completion of Sertoli cell maturation in response to androgens at puberty in the mouse, we proposed that CYP26B1 is downregulated by androgens in the Sertoli cell during this period. By immunohistochemistry, we showed that CYP26B1 declines in Sertoli cells after birth. However, luciferase reporter assays and quantitative reverse transcription-polymerase chain reaction performed in the prepubertal mouse Sertoli cell line SMAT1 revealed no changes in Cyp26b1 expression in response to androgen treatment. Furthermore, studies carried out using primary Sertoli cells of 10-day-old mice showed no changes in either Cyp26b1 or CYP26B1 expression in response to androgen treatment. In summary, the hereby reported decline in CYP26B1 expression in Sertoli cells towards pubertal onset does not appear to be caused by a direct inhibitory effect of androgens on Sertoli cells in the mouse.

Paleomagnetic confirmation of the “unorthodox” configuration of Atlantica between 2.1 and 2.0 Ga Franceschinis, Pablo Reinaldo; Rapalini, Augusto Ernesto; Sánchez Bettucci, Leda; Martínez Dopico, Carmen Irene; Milanese, Florencia Nidia The paleogeographic evolution of the Río de la Plata Craton during the Precambrian poses important questions regarding its participation in the Atlantica continent and Columbia supercontinent. With the aim of contributing to the paleogeographic evolution of the craton in mid-Paleoproterozoic times, systematic paleomagnetic studies were carried out in late- to post-tectonic plutons of the Piedra Alta terrane (Uruguay). These yielded six new paleomagnetic poles with ages between 2.1 and 2.0 Ga that can be interpreted as integrating a single apparent polar wander path together with three previous poles from the same terrane and similar ages. The positions of the poles along the proposed path are compatible with the known ages of the intrusives from which they were computed and show a smooth distribution of magnetic polarities. Comparison of this path with those coeval from other South American and African cratons confirms previous interpretations that if the Atlantica continent ever existed, had a significantly different configuration than the originally proposed. Based on the new apparent polar wander path proposed for this different continental configuration a model of its paleogeographic evolution that suggests fast displacements in (probably southern) polar latitudes during the study time lapse is presented.

An empirical analysis of competitive nonlinear pricing Aryal, Gaurab; Gabrielli, Maria Florencia We estimate a model of competitive nonlinear pricing with multidimensional preference heterogeneity using individual level data on advertisements bought by local businesses (e.g., doctors, electricians) from two Yellow Page Directories in one U.S. city-market. Variation in individual choices and payments allows us to identify the joint density of preferences, marginal costs of publishing and common utility parameters. Our estimates suggest substantial welfare loss due to asymmetric information. Comparing duopoly outcomes with (counterfactual) monopoly outcomes, we find that with less competition (i) producer surplus increases substantially; (ii) more “low-type” consumers are excluded; (iii) product variety increases, but benefits accrue only to the “high-type” consumers; (iv) total consumer surplus decreases; (v) but its distribution, across consumers, does not change.

Sensitivity of the frog model to initial conditions Johnson, Tobias; Trivellato Rolla, Leonardo The frog model is an interacting particle system on a graph. Active particles perform independent simple random walks, while sleeping particles remain inert until visited by an active particle. Some number of sleeping particles are placed at each site sampled independently from a certain distribution, and then one particle is activated to begin the process. We show that the recurrence or transience of the model is sensitive not just to the expectation but to the entire distribution. This is in contrast to closely related models like branching random walk and activated random walk.

Análisis de la primera implementación de la propuesta didáctica “Ondas gravitacionales en contexto para la escuela secundaria: física contemporánea, divulgación científica y género”; Analysis of the first implementation of the didactic proposal “Gravitational waves in context for high school: contemporary physics, scientific divulgation and gender” Cayul, Esther Elisabet; Arriassecq, Irene; Greca, Ileana M.; Givonetti, Adrián Este trabajo analiza la primera implementación de una secuencia didáctica elaborada para el abordaje, en la escuela secundaria, del concepto “ondas gravitacionales”. La secuencia está contextualizada en los marcos teóricos Física Primero, naturaleza de la ciencia y Enseñanza para la Comprensión. Los recursos principales utilizados son materiales de divulgación disponibles en diversos formatos (textos, videos, animaciones) con un enfoque que permite analizar tanto aspectos conceptuales como aquellos vinculados con la producción del conocimiento científico, entre los cuales se incluyen las cuestiones de género. Los desempeños de comprensión logrados por los alumnos son alentadores, e indican el alcance de las metas propuestas a partir del tópico generativo ondas gravitacionales, como también de aspectos epistemológicos y sociológicos de naturaleza de la ciencia.; This work analyzes the first implementation of a didactic sequence designed with the purpose of approaching the concept "gravitational waves" at high school level. The sequence is contextualized in the theoretical frameworks of Physics First, Nature of Science and Teaching for Understanding. The main resources used are materials available in various formats (texts, videos, animations) with an approach that allows analyzing both conceptual aspects and those related to the production of scientific knowledge, among which gender issues are included. The results are encouraging in terms of the comprehension performances achieved by the students. This indicates the scope of the proposed goals from the generative topic of gravitational waves, as well as epistemological and sociological aspects of the nature of science.

Construcción de la Función Exponencial a partir de la Potenciación Sureda Figueroa, Diana Patricia; Otero, Maria Rita La riqueza de propiedades de la función exponencial permite estudiarla desde diferentes enfoques. La definición de las potencias naturales (y no naturales) de un número real, y sus propiedades, permite construir la función exponencial de exponente real. Pero la construcción requiere también la noción de sucesiones, aproximación decimal de un número racional, convergencia, y límite de una función. La construcción excedería lo que se podría hacer en el nivel secundario, pero brinda a los profesores la posibilidad de revisar la enseñanza de las propiedades de las potencias no naturales en el aula.

Desarrollo, ciencia, tecnología y producción en Argentina: Desempeño y dinámicas en el siglo XXI de Angelis, Ignacio El artículo propone el análisis de las principales dinámicas institucionales y materiales que caracterizaron el sistema de ciencia, tecnología e innovación durante el ciclo del Gobierno kirchnerista (2003-2015) y la ruptura que forzó la nueva administración desde 2015. Desde allí, el trabajo busca exponer cómo confluyen las formas institucionales y los componentes centrales del sistema de innovación con las capacidades productivas del país. Para ello, se describen las principales transformaciones en el plano organizacional, destacando el proceso de formación y desarrollo de competencias para la generación y adaptación de tecnología, como también respecto al desarrollo de los recursos complementarios durante el período de estudio de referencia.

Development and validation of the Spanish Work-Family Conflict Scale (SP-WFCS): Evidence from two independent samples in Argentina Pujol Cols, Lucas Joan Research on work-family conflict has increased dramatically in recent years. In this study, we developed a Spanish version of the Work-Family Conflict Scale (Carlson et al. Journal of Vocational Behavior, 56(2), 249–276, 2000) and examined its reliability, dimensionality, factor invariance, gender invariance, convergent validity, discriminant validity, and empirical validity. To this end, we analyzed data collected from two independent samples of Argentinian employees (N = 618). The results from the confirmatory factor analysis (CFA) revealed that the Spanish Work-Family Conflict Scale (SP-WFCS) displayed a sixdimensional factor structure (CFI ≥ .96, TLI = .96, RMSEA = .06). Furthermore, each dimension showed satisfactory levels of internal consistency (α estimates ranged from .80 to .92), convergent validity (AVE estimates ranged from .59 to .80, and CR estimates ranged from .81 to .92) and discriminant validity (AVE values ≥ shared variance estimates). Moreover, the results from the multi-group confirmatory factor analyses indicated that the six-dimensional model of the SP-WFCS was statistically invariant across samples and gender. Finally, most work-family conflict dimensions displayed significant correlations with three antecedents (i.e., quantitative demands, emotional demands, and core self-evaluations) and two outcomes (i.e., affective job satisfaction and burnout). Taken together, the results provided support to the validity of the SP-WFCS in Argentina, suggesting that it may be a reliable and valid instrument to measure work-family conflict in Spanish-speaking countries. Limitations to the study and opportunities for future research are discussed in this article.

Impacto en los flujos hídricos por la presencia de horizontes petrocálcicos en parcelas forestadas en ambientes de llanura Mujica, Claudio Ramon; Millone, G. M.; Bea, Sergio Andrés; Gyenge, Javier Enrique Alrededor del mundo existen numerosos paisajes con presencia de horizontes petrocálcicos, como en el caso de la llanura Pampeana en Sudamérica. En muchos casos, estos horizontes constituyen una barrera física al flujo de agua, e incluso un reservorio de agua para consumo de las plantas. La llanura Pampeana es uno de los paisajes económicamente más productivos de Argentina, y tal como en otras regiones que naturalmente estuvieron cubiertas con pastizales, estos han sido reemplazados por otros usos. En muchos casos, estos cambios en el uso del suelo han modificado los flujos hídricos y de solutos de estos sistemas, y el ejemplo más drástico es el de la forestación por su gran consumo de agua y la toma selectiva de solutos. Sin embargo, el impacto de esta práctica sobre suelos con presencia de horizontes petrocálcicos no ha sido suficientemente estudiado. Dentro de esta región se ha monitoreado variables hidrológicas de un conjunto parcelas de pastizal y forestación apareadas, con niveles de horizontes petrocálcicos. Se desarrolló un modelo numérico basado en procesos físicos/biológicos y condiciones de contorno atmosféricas, con el objetivo de cuantificar los flujos hídricos y el agua disponible para para el consumo de la forestación. Los resultados del modelo sugieren desconexión hidráulica entre la forestación y el freático debido a la presencia del horizonte petrocálcico, con solo un ~ 13% de agua adquirida a través del horizonte petrocálcico. Se predicen largos períodos de estrés hídrico durante los momentos de gran demanda atmosférica, y consumo de agua por parte de la forestación está restringido a las porciones por encima del horizonte petrocálcico. Las tazas de transpiración fueron de (~700-723 mm año-1) similar, o aun mayor a lo reportado en la zona. El horizonte petrocálcico retiene agua y reduce el drenaje profundo.

Construir la política con imágenes e instituir imágenes de lo político: Caras y Caretas, 1898-1916; Buil the politics with images and institute images of the political: Caras y Caretas, 1898-1916 Gómez, Silvana Anahí En el artículo consideramos el semanario Caras y Caretas en el período 1898 (año de su lanzamiento) hasta 1916 (momento en el que según la revista la iconografía política había cobrado importante protagonismo). Tras una breve presentación de Caras y Caretas, estudiamos los modos con los que el semanario plasmó la incorporación de imágenes en la política. Luego, abordamos caricaturas de portada a partir de un análisis indiciario. Los intensos vínculos entre palabras e imágenes así como la distinción entre la política y lo político recorren este trabajo.; In the article we consider the weekly Caras y Caretas in the period 1898 (year of its launch) until 1916 (at wich time acoording to the magazine the political iconography was developed). After a brief presentation of Caras y Caretas, we study the weekly review of the incorporation of images in politics. Rhen, we cover cartoons base don a index analysis. The intense links between Word and images as well as the distinction between politics and the politics go through this work.

Interaction between prospective risk factors in the prediction of suicide risk Grendas, Leandro; Rojas, Sasha M.; Puppo, Soledad; Vidjen, Patricia; Portela, Alicia Andrea; Chiapella, Luciana Carla; Rodante, Demián; Daray, Federico Manuel Background: To meet the goal of preventing suicide the most important thing is to know the risk factors of suicidal behavior and understand their interaction. Aims: The current study aims to evaluate prospective predictors and the interaction between factors for suicide and suicide re-attempts in high-risk, suicidal patients during a 24 month prospective follow-up period. Methods: A multicenter prospective cohort study was designed to compare data obtained from 324 patients admitted to the emergency department for current suicidal ideation or a recent suicide attempt. Participants were clinically evaluated at baseline and follow-up every 6 months to assess any unfavorable events (suicide or a suicide attempt). To estimate the rate of unfavorable events, the Kaplan–Meier method was used and Cox Proportional Hazards Regression Model was employed to examine predictors of suicide and suicide reattempt. Results: The incidence of a new suicide attempt was 26,000 events/100,000 persons-years. The incidence of death by suicide was 1110 events/100,000 person-year. The most reliable predictors of unfavorable events were being women, previous suicide attempts, younger age, and childhood sexual abuse. Findings revealed an interaction between childhood sexual abuse and low psychosocial functioning that increased the risk of an unfavorable event. Conclusion: The risk of suicide re-attempts and suicide in the current 2-year follow-up was high. There was an interaction between low psychosocial functioning and childhood sexual abuse. This evidence should be taken into account for the evaluation and planning of preventive strategies.

Psicomotricidad y recursos humanos: experiencia en una organización laboral de Argentina; Psychomotricity and human resources: experience in a labor organization in Argentina Castelletti, Adriel Fabricio; Vaja, Arabela Beatriz; Paoloni, Paola Veronica Rita En el presente artículo nos proponemos comentar una experiencia psicomotriz con adultos en un contexto laboral. Dicha experiencia tuvo como objetivo favorecer la conciencia corporal, la modulación del tono y adecuación postural y lograr un cambio de actitud general en el contexto sociolaboral. Ello se concretó a partir de la realización de dos talleres de Psicomotricidad utilizando la relajación como recurso técnico de intervención disciplinar. A los fines de compartir la experiencia, organizamos este escrito de la siguiente manera: en primer lugar,hacemos referencia al marco teórico que sustentó experiencia. En segundo lugar, describimos los talleres desarrollados y analizamos los resultados comentando las valoraciones que los participantes manifestaron a través de cuestionarios individuales escritos. Por último, referimos a las consideraciones finales, que contribuyen a pensar este nuevo escenario a partir del impacto de las propuestas realizadas a los adultos en este contexto y de los nuevos desafíos que las organizaciones plantean al psicomotricista.; In this article we propose to comment on a psychomotor experience with adults in a work context. This experience was aimed at promoting body awareness, tone modulation and postural adequacy and achieving a general attitude change in the socio-labor context. This was concretized after two Psychomotor workshops were carried out using relaxation as a technical resource for disciplinary intervention. For the purpose of sharing the experience, we organize this writing as follows: first, we refer to the theoretical framework that supported experience. Second, we describe the workshops developed and analyze the results by commenting on the evaluations that the participants expressed through written individual questionnaires. Finally, we refer to the final considerations, which consider this new scenario a thought based on the impact of the proposals made to adults in this context and the new challenges that organizations pose to the psychomotorist.

Effect of photoperiod on ovarian maturation in Cheirodon interruptus (Teleostei: Characidae); Efeito do fotoperíodo na maturação dos ovários em Cheirodon interruptus (Teleostei: Characidae) Garcia, Ignacio Daniel; Plaul, Silvia Elena; Torres, D.; del Fresno, Pamela Sabrina; Miranda, Leandro Andres; Colautti, Dario César Cheirodon interruptus is a ubiquitous small characid that inhabits the Pampean region and commonly used as bait. Its vast market is supplied from the wild population causing a significant environmental impact. In this study, we assessthe effect of photoperiod on ovarian maturation in order to evaluate its potential as a tool to manipulate reproduction under artificial conditions. Four treatments in triplicate (light: dark, L: D) were tested: 24L: 0D, 12L: 12D, 0L: 24D and a progressive photoperiod corresponding to the daily photoperiod increments in wild during winter-spring transition, accelerated three times. The experiment was conducted for 45 days. Gonadosomatic index (GSI), oocyte mean diameter, vitellogenic oocyte proportions, plasma estradiol concentrations (E2), condition factor (Kn) and standard length were estimated. Values of mean GSI, oocyte diameter, vitellogenic oocyte proportions and E2 concentration were maximum in the progressive treatment indicating vitellogenesis stimulation. In turn the same parameters were minimum in the 24L: 0D, revealing the vitellogenesis inhibition. This study showed that photoperiodic regime play an important role in the onset of ovarian maturation in C. interruptus.; Cheirodon interruptus é um pequeno caracídeo amplamente distribuído na região Pampeana e comumente usado como isca. Seu vasto mercado se abastece de populações silvestres causando um impacto ambiental significativo. Neste estudo, investigamos o efeito do fotoperíodo no amadurecimento do ovário para avaliar o potencial deste fator como ferramenta para manipular a reprodução em condições artificiais. Quatro tratamentos foram testados por triplicado (luz: escuro, L: D): 24L: 0D, 12L: 12D, 0L: 24D e um fotoperíodo progressivo que simula as mudanças das horas luz na natureza e na transição de inverno a primavera, acelerado três vezes. O experimento se realizou durante 45 dias. O índice gonadossomático (GSI), o diâmetro médio dos ovócitos, a proporção de ovócitos vitelogênicos, as concentrações plasmáticas de estradiol (E2), o fator de condição (Kn) e o comprimento padrão foram estimados. Os valores médios de GSI, o diâmetro dos ovócitos, as proporções de ovócitos vitelogênicos e a concentração de E2 foram maximizados no fotoperíodo progressivo, indicando estimulação de vitelogênesis. Por outro lado, esses mesmos parâmetros resultaram mínimos no tratamento 24L: 0D, revelando um efeito inibidor da vitelogênesis. Este estudo mostrou que as variações de fotoperíodo exercem um papel importante no início vitelogênesis reprodutiva em C. interruptus.

New algorithms for weighted k-domination and total k-domination problems in proper interval graphs Chiarelli, Nina; Hartinger, Tatiana Romina; Leoni, Valeria Alejandra; Lopez Pujato, María Inés; Milanič, Martin Given a positive integer k, a k-dominating set in a graph G is a set of vertices such that every vertex not in the set has at least k neighbors in the set. A total k-dominating set is a set of vertices such that every vertex of the graph has at least k neighbors in the set. The problems of finding the minimum size of a k-dominating, respectively total k-dominating set, in a given graph, are referred to as k-domination, respectively total k-domination. These generalizations of the classical domination and total domination problems are known to be NP-hard in the class of chordal graphs, and, more specifically, even in the classes of split graphs (both problems) and undirected path graphs (in the case of total k-domination). On the other hand, it follows from previous works by Bui-Xuan et al. (2013) [8] and by Belmonte and Vatshelle (2013) [3] that these two families of problems are solvable in time O(|V(G)|3k+4) in the class of interval graphs. We develop faster algorithms for k-domination and total k-domination in the class of proper interval graphs, by means of reduction to a single shortest path computation in a derived directed acyclic graph with O(|V(G)|2k) nodes and O(|V(G)|4k) arcs. We show that a suitable implementation, which avoids constructing all arcs of the digraph, leads to a running time of O(|V(G)|3k). The algorithms are also applicable to the weighted case.