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Martin Schiller, Martin Bizzarro, Vera Assis Fernandes
Nucleosynthetic isotope variability among Solar System objects is often used to probe the genetic relationship between meteorite groups and the rocky planets (Mercury, Venus, Earth and Mars), which, in turn, may provide insights into the building blocks of the Earth-Moon system. Using this approach, it has been inferred that no primitive meteorite matches the terrestrial composition and the protoplanetary disk material from which Earth and the Moon accreted is therefore largely unconstrained. This conclusion, however, is based on the assumption that the observed nucleosynthetic variability of inner-Solar-System objects predominantly reflects spatial heterogeneity...
March 21, 2018: Nature
Anna Urso, Matthew Chojnacki, David A Vaz
Isolated landscapes largely shaped by aeolian processes can occur on Earth, while the majority of Mars' recent history has been dominated by wind-driven activity. Resultantly, Martian landscapes often exhibit large-scale aeolian features, including yardang landforms carved from sedimentary-layered deposits. High-resolution orbital monitoring has revealed that persistent bedform activity is occurring with dune and ripple migration implying ongoing abrasion of the surface. However, little is known about the interaction between dunes and the topography surrounding them...
2018: Journal of Geophysical Research. Planets
Matthew Chojnacki, Lori K Fenton
The Mars Science Laboratory rover Curiosity engaged in a monthlong campaign investigating the Bagnold dune field in Gale crater. What represents the first in situ investigation of a dune field on another planet has resulted in a number of discoveries. Collectively, the Curiosity rover team has compiled the most comprehensive survey of any extraterrestrial aeolian system visited to date with results that yield important insights into a number of processes, including sediment transport, bed form morphology and structure, chemical and physical composition of aeolian sand, and wind regime characteristics...
November 2017: Journal of Geophysical Research. Planets
Bogna Stawarczyk, Nina Lümkemann, Marlis Eichberger, Timea Wimmer
The purpose of this investigation was to analyze the accuracy of digitally fabricated wax trial dentures and conventionally finalized complete dentures in comparison to a surface tessellation language (STL)-dataset. A generated data set for the denture bases and the tooth sockets was used, converted into STL-format, and saved as reference. Five mandibular and 5 maxillary denture bases were milled from wax blanks and denture teeth were waxed into their tooth sockets. Each complete denture was checked on fit, waxed onto the dental cast, and digitized using an optical laboratory scanning device...
December 19, 2017: Dent J (Basel)
Arianne D Pieterse, Volkert A L Huurman, Beerend P Hierck, Marlies E J Reinders
No abstract text is available yet for this article.
March 18, 2018: Transplant Immunology
Douglas Ruden, Alan Bolnick, Awoniyi Awonuga, Mohammed Abdulhasan, Gloria Perez, Elizabeth Ella Puscheck, Daniel A Rappolee
Plant and animal life forms evolved mechanisms for sensing and responding to gravity on Earth where homeo-static needs require responses. The lack of gravity, such as in the International Space Station (ISS), causes acute, intra-generational changes in the quality of life. These include maintaining calcium levels in bone, main-taining muscle tone, and disturbances in the vestibular apparatus in the ears. These problems decrease work efficiency and quality of life of humans not only during microgravity exposures but also after return to higher gravity on Earth or destinations such as Mars or the Moon...
March 21, 2018: Stem Cells and Development
Haize Goikuria, Maria Del Mar Freijo, Reyes Vega Manrique, María Sastre, Elena Elizagaray, Ana Lorenzo, Koen Vandenbroeck, Iraide Alloza
Vascular smooth muscle cells (VSMCs) are central players in carotid atherosclerosis plaque development. Although the precise mechanisms involved in plaque destabilization are not completely understood, it is known that VSMC proliferation and migration participate in plaque stabilization. In this study, we analyzed expression patterns of genes involved in carotid atherosclerosis development (e.g., transcription factors of regulation of SMC genes) of VSMCs located inside or outside the plaque lesion that may give clues about changes in phenotypic plasticity during atherosclerosis...
March 18, 2018: Cells
Hui Wang, Yanan Xu, Hongli Shi
PURPOSE: Metal artifacts severely degrade CT image quality in clinical diagnosis, which are difficult to removed, especially for the beam hardening artifacts. The metal artifact reduction (MAR) based on prior images are the most frequently-used methods. However, there exists a lot misclassification in most prior images caused by absence of prior information such as spectrum distribution of X-ray beam source, especially when multiple or big metal are included. This work aims is to identify a more accurate prior image to improve image quality...
March 15, 2018: Journal of X-ray Science and Technology
Mercè Boada, Miguel A Santos-Santos, Octavio Rodríguez-Gómez, Montserrat Alegret, Pilar Cañabate, Asunción Lafuente, Carla Abdelnour, Mar Buendía, Maria José de Dios, América Morera, Ángela Sanabria, Laura Campo, Agustín Ruiz, Lluís Tárraga
Alzheimer's disease (AD) research is at a critical time. The global society is increasingly aware of the frightening rate of growth of the human and financial burden caused by this condition and of the urgent need to halt its progression. Consequently, the scientific community holds great responsibility to quickly put in place and optimize the machinery necessary for testing new treatments or interventions. In this context demand for participants for AD research is at an all-time high. In this review, we will focus on a methodological factor that is increasingly recognized as a key factor that shapes trial populations and affects validity of results in clinical trials: patient engagement, recruitment, and retention...
2018: Journal of Alzheimer's Disease: JAD
Félix Hernández, María Llorens-Martín, Marta Bolós, Mar Pérez, Raquel Cuadros, Noemí Pallas-Bazarra, Juan C Zabala, Jesús Avila
Alzheimer's disease (AD) is characterized by the presence of two aberrant structures: namely senile plaques, composed of amyloid-β peptide (Aβ), and neurofibrillary tangles, composed of tau protein. In this regard, Aβ and tau protein have been widely studied in research efforts aiming to find a therapy for AD. Aβ and tau pathologies do not always overlap. The precursor of Aβ is expressed in peripheral tissues and in the central nervous system (CNS), whereas tau is mainly a neuronal protein. Since AD is a disease of the CNS, it has been proposed that Aβ may initiate the disease process, with tau being the executor...
March 16, 2018: Journal of Alzheimer's Disease: JAD
Manoel Vieira de Miranda Neto, Talita Rewa, Valéria Marli Leonello, Maria Amélia de Campos Oliveira
OBJECTIVE: Reflect on the role of advanced practice nursing (APN) in the context of Brazilian primary health care. METHOD: analysis of the main scientific productions and of the discussion on the implementation of APN. RESULTS: there are favorable areas for the work of APN in primary health care, especially in the family health strategy. Professional master's degree and nurse residency programs constitute powerful training spaces. As a challenge, standardized definition of the roles of advanced practice nurses and of minimum training for work are necessary...
2018: Revista Brasileira de Enfermagem
Vanessa da Frota Santos, Samyla Citó Pedrosa, Priscila de Souza Aquino, Ivana Cristina Vieira de Lima, Gilmara Holanda da Cunha, Marli Teresinha Gimeniz Galvão
OBJECTIVE: To analyze the social support of people with HIV/AIDS from the perspective of the Social Determinants of Health Model. METHOD: This was a cross-sectional study conducted in 2015 in an infectious disease outpatient clinic. The sample was made up of 116 people with HIV/AIDS. The data was collected through interviews, using a sociodemographic form and a social support scale. The data was analyzed using descriptive statistics, and Student's t-tests and Mann-Whitney tests were performed to determine the association between social support and the social determinants of health...
2018: Revista Brasileira de Enfermagem
Danieli Parreira da Silva Stalisz da Paixão, Josemar Batista, Eliane Cristina Sanches Maziero, Francine Taporosky Alpendre, Marly Ryoko Amaya, Elaine Drehmer de Almeida Cruz
OBJECTIVE: To investigate compliance of national patient safety protocols in Emergency Care Units (UPA) of the Paraná State. METHOD: From April until September 2016, the exploratory stage of the action research was conducted on stratified sampling with 377 patients of eight units, with use of verification instrument of basic safety actions. RESULTS: The absence of systematic identification of patients, fall risk assessment and signaling and development of pressure injuries were evidenced...
2018: Revista Brasileira de Enfermagem
Maria Del Mar Amador, Marion Masingue, Rabab Debs, Foudil Lamari, Vincent Perlbarg, Emmanuel Roze, Bertrand Degos, Fanny Mochel
BACKGROUND: Cerebrotendinous xanthomatosis (CTX) is a rare neurodegenerative disease related to sterols metabolism. It affects both central and peripheral nervous systems but treatment with chenodeoxycholic acid (CDCA) has been reported to stabilize clinical scores and improve nerve conduction parameters. Few quantitative brain structural studies have been conducted to assess the effect of CDCA in CTX. METHODS AND RESULTS: We collected retrospectively clinical, neurophysiological, and quantitative brain structural data in a cohort of 14 patients with CTX treated by CDCA over a mean period of 5 years...
March 20, 2018: Journal of Inherited Metabolic Disease
Anna Hall, Laurence W Busse, Marlies Ostermann
This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2018. Other selected articles can be found online at . Further information about the Annual Update in Intensive Care and Emergency Medicine is available from .
March 20, 2018: Critical Care: the Official Journal of the Critical Care Forum
Nina McTiernan, Svein Isungset Støve, Ingvild Aukrust, Marita Torrisen Mårli, Line M Myklebust, Gunnar Houge, Thomas Arnesen
BACKGROUND: The NAA10-NAA15 (NatA) protein complex is an N-terminal acetyltransferase responsible for acetylating ~ 40% of eukaryotic proteins. In recent years, NAA10 variants have been found in patients with an X-linked developmental disorder called Ogden syndrome in its most severe form and, in other familial or de novo cases, with variable degrees of syndromic intellectual disability (ID) affecting both sexes. CASE PRESENTATION: Here we report and functionally characterize a novel and de novo NAA10 (NM_003491...
March 20, 2018: BMC Medical Genetics
S K Schmidt, E M S Gendron, K Vincent, A J Solon, P Sommers, Z R Schubert, L Vimercati, D L Porazinska, J L Darcy, P Sowell
Here we describe recent breakthroughs in our understanding of microbial life in dry volcanic tephra ("soil") that covers much of the surface area of the highest elevation volcanoes on Earth. Dry tephra above 6000 m.a.s.l. is perhaps the best Earth analog for the surface of Mars because these "soils" are acidic, extremely oligotrophic, exposed to a thin atmosphere, high UV fluxes, and extreme temperature fluctuations across the freezing point. The simple microbial communities found in these extreme sites have among the lowest alpha diversity of any known earthly ecosystem and contain bacteria and eukaryotes that are uniquely adapted to these extreme conditions...
March 20, 2018: Antonie Van Leeuwenhoek
Rosa de la Torre Noetzel, Ana Z Miller, José M de la Rosa, Claudia Pacelli, Silvano Onofri, Leopoldo García Sancho, Beatriz Cubero, Andreas Lorek, David Wolter, Jean P de Vera
Lichens are extremely resistant organisms that colonize harsh climatic areas, some of them defined as "Mars-analog sites." There still remain many unsolved questions as to how lichens survive under such extreme conditions. Several studies have been performed to test the resistance of various lichen species under space and in simulated Mars-like conditions. The results led to the proposal that Circinaria gyrosa (Lecanoromycetes, Ascomycota) is one of the most durable astrobiological model lichens. However, although C ...
2018: Frontiers in Microbiology
Jorge Ruiz-Orera, Pol Verdaguer-Grau, José Luis Villanueva-Cañas, Xavier Messeguer, M Mar Albà
Accumulating evidence indicates that some protein-coding genes have originated de novo from previously non-coding genomic sequences. However, the processes underlying de novo gene birth are still enigmatic. In particular, the appearance of a new functional protein seems highly improbable unless there is already a pool of neutrally evolving peptides that are translated at significant levels and that can at some point acquire new functions. Here, we use deep ribosome-profiling sequencing data, together with proteomics and single nucleotide polymorphism information, to search for these peptides...
March 19, 2018: Nature Ecology & Evolution
Robert I Citron, Michael Manga, Douglas J Hemingway
Widespread evidence points to the existence of an ancient Martian ocean. Most compelling are the putative ancient shorelines in the northern plains. However, these shorelines fail to follow an equipotential surface, and this has been used to challenge the notion that they formed via an early ocean and hence to question the existence of such an ocean. The shorelines' deviation from a constant elevation can be explained by true polar wander occurring after the formation of Tharsis, a volcanic province that dominates the gravity and topography of Mars...
March 19, 2018: Nature
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