Hydrochemistry measurements and diazotroph abundances

Microbial dinitrogen (N2) fixation, the nitrogenase enzyme-catalysed reduction of N2 gas into biologically available ammonia, is the main source of new nitrogen (N) in the ocean. For more than 50 years, oceanic N2 fixation has mainly been attributed to the activity of the colonial cyanobacterium Trichodesmium. Other smaller N2-fixing microorganisms (diazotrophs)-in particular the unicellular cyanobacteria group A (UCYN-A)-are, however, abundant enough to potentially contribute significantly to N2 fixation in the surface waters of the oceans. Despite their abundance, the contribution of UCYN-A to oceanic N2 fixation has so far not been directly quantified. Here, we show that in one of the main areas of oceanic N2 fixation, the tropical North Atlantic7, the symbiotic cyanobacterium UCYN-A contributed to N2 fixation similarly to Trichodesmium. Two types of UCYN-A, UCYN-A1 and -A2, were observed to live in symbioses with specific eukaryotic algae. Single-cell analyses showed that both algae-UCYN-A symbioses actively fixed N2, contributing ~20% to N2 fixation in the tropical North Atlantic, revealing their significance in this region. These symbioses had growth rates five to ten times higher than Trichodesmium, implying a rapid transfer of UCYN-A-fixed N into the food web that might significantly raise their actual contribution to N2 fixation. Our analysis of global 16S rRNA gene databases showed that UCYN-A occurs in surface waters from the Arctic to the Antarctic Circle and thus probably contributes to N2 fixation in a much larger oceanic area than previously thought. Based on their high rates of N2 fixation and cosmopolitan distribution, we hypothesize that UCYN-A plays a major, but currently overlooked role in the oceanic N cycle.

(Table 1) Interstitial water geochemistry at DSDP Leg 84 Holes

On DSDP Leg 84, drilling was conducted at three gas-hydrate-bearing sites on the Middle America Trench slope off Costa Rica (Site 565) and off Guatemala (Sites 568 and 570). At Site 569, on the mid-slope off Guatemala, hydrates may be present, according to the seismic profile (GUA-13), although the pore-water composition does not provide clear evidence. Sites 566 and 567, on the lower Guatemala Trench slope, appear to be free of hydrates, except in fractures of serpentinite at the bottom of Hole 566. Hydrate-bearing Sites 565, 568, and 570 show the effects of hydrate decomposition on pore-water chemistry that have been established during previous drilling at Sites 496 and 497 on the Guatemala Trench slope. These include a chlorinity decrease and d18O increase downsection. The new results, however, reveal more complex relationships between the chlorinity decrease and d18O increase than previously recognized. At Site 565, d18O values decrease in the middle section of the hole, whereas chlorinity continues to decrease from the top to near the bottom of the hole. Early diagenetic alteration of volcanic glass is suggested as a mechanism for the unexpected minimum in the O-isotope curve. Multiple fractionation by the pore-water/hydrate system is required to explain d18O-values greater than 2.7 per mil at the bottom of Hole 568, because with a fractionation factor of alpha = 1.0027, this is the maximum figure a single-stage fractionation could produce. In situ water samples from hydrate zones in most cases failed to display the elevated salinities expected for the residual pore waters not involved in hydrate formation. This is probably because the in situ sampling device still allows a systematic pressure drop sufficient to trigger hydrate decomposition in the immediate vicinity of the sample port.

(Table 1) N-isotope record of planktonc foraminifera of sediment core MD02-2550C2

Constraining variations in marine N2-fixation over glacial-interglacial timescales is crucial for determining the role of the marine nitrogen cycle in modifying ocean productivity and climate, yet paleo-records from N2-fixation regions are sparse. Here we present new nitrogen isotope (d15N) records of bulk sediment and foraminifera test-bound (FB) nitrogen extending back to the last ice age from the oligotrophic Gulf of Mexico (GOM). Previous studies indicate a substantial terrestrial input during the last ice age and early deglacial, for which we attempt to correct the bulk sediment d15N using its observed relationship with the C/N ratio. Both corrected bulk and FB-d15N reveal a substantial glacial-to-Holocene decrease of d15N toward Holocene values of around 2.5 per mil, similar to observations from the Caribbean. This d15N change is most likely due to a glacial-to-Holocene increase in regional N2-fixation. A deglacial peak in the FB-d15N of thermocline dwelling foraminifera Orbulina universa probably reflects a whole ocean increase in the d15N of nitrate during deglaciation. The d15N of the surface dwelling foraminifera Globigerinoides ruber and the corrected bulk d15N show little sign of this deglacial peak, both decreasing from last glacial values much earlier than does the d15N of O. universa; this may indicate that G. ruber and bulk N reflect the euphotic zone signal of an early local increase in N2-fixation. Our results add to the evidence that, during the last ice age, the larger iron input from dust did not lead to enhanced N2-fixation in this region. Rather, the glacial-to-Holocene decrease in d15N is best explained by a response of N2-fixation within the Atlantic to the deglacial increase in global ocean denitrification.

Global distributions of diazotrophs abundance and biomass - Depth integrated values computed from a collection of source datasets - Contribution to the MAREDAT World Ocean Atlas of Plankton Functional Types

The MAREDAT atlas covers 11 types of plankton, ranging in size from bacteria to jellyfish. Together, these plankton groups determine the health and productivity of the global ocean and play a vital role in the global carbon cycle. Working within a uniform and consistent spatial and depth grid (map) of the global ocean, the researchers compiled thousands and tens of thousands of data points to identify regions of plankton abundance and scarcity as well as areas of data abundance and scarcity. At many of the grid points, the MAREDAT team accomplished the difficult conversion from abundance (numbers of organisms) to biomass (carbon mass of organisms). The MAREDAT atlas provides an unprecedented global data set for ecological and biochemical analysis and modeling as well as a clear mandate for compiling additional existing data and for focusing future data gathering efforts on key groups in key areas of the ocean. The present data set presents depth integrated values of diazotrophs abundance and biomass, computed from a collection of source data sets.

HDPR: A Mobile Testbed for Current and Future Rover Technologies

The paper in hand presents a mobile testbed –namely the Heavy Duty Planetary Rover (HDPR)– that was designed and constructed at the Automation and Robotics Laboratories (ARL) of the European Space Agency to fulfill the lab’s internal needs in the context of long range rover exploration as well as in order to provide the means to perform in situ testing of novel algorithms. We designed a rover that: a) is able to reliably perform long range routes, and b) carries an abundant of sensors (both current rover technology and futuristic ones). The testbed includes all the additional hardware and software (i.e. ground control station, UAV, networking, mobile power) to allow the prompt deployment on the field. The reader can find in the paper the description of the system as well as a report on our experiences during our first experiments with the testbed.

¿Fue la crisis política del Occidente musulmán del siglo XIII debida a un cambio climático? Una aproximación histórica al fin del Periodo Cálido Medieval

Durante el siglo XIII se produjo una sucesión de revueltas que supuso la desaparición del Imperio almohade y su sustitución por poderes regionales en al-Andalus, el Magreb y el Magreb al-Aqsà. La historiografía ha presentado el surgimiento y pugna entre estos poderes como un fenómeno social, político e, incluso, cultural y religioso, con el que se ha podido explicar su aniquilación o marginalización. Este trabajo pretende contextualizar los hechos desde una perspectiva medioambiental, de forma que la desintegración del califato almohade, el surgimiento de aquellos poderes y la progresión de los reinos cristianos en la península ibérica puedan entenderse desde una visión global de cambio climático y una posible crisis agrícola.

A Relação entre Mindfulness, Auto-Compaixão, Vergonha e Psicopatologia em Praticantes e Não Praticantes de Meditação/Yoga

O estudo do mindfulness tem sido alvo de um crescente interesse no domínio da Psicologia, pela sua importância no aumento de bem-estar e redução de sintomatologia psicopatológica. Os estudos realizados acerca da forma como o mindfulness assume um papel preponderante no bem-estar psicológico dos indivíduos, tendo por base um conjunto de competências ou aptidões que podem ser aprendidas e praticadas, favorece uma melhoria da saúde e do bem-estar dos indivíduos. Deste modo, com o objectivo de contribuir para o conhecimento da relação entre mindfulness, auto-compaixão, vergonha e psicopatologia em praticantes e não praticantes de meditação/yoga, realizou-se um conjunto de estudos numa amostra constituída por 121 sujeitos, em que 53 integram uma população praticante de meditação/yoga e 68 pertencem à população geral não praticante de meditação/yoga. Os resultados revelam que indivíduos praticantes de meditação/yoga registam valores significativamente mais elevados nas facetas observar e não reagir da escala de mindfulness. Por sua vez, sujeitos com maiores índices de traço de mindfulness apresentam níveis mais baixos de vergonha externa e interna. Para além disto, indivíduos com elevado traço de mindfulness distinguem-se significativamente dos indivíduos com baixo traço de mindfulness ao apresentarem níveis mais elevados de auto-compaixão e níveis mais baixos de depressão, ansiedade e stress. / The study of mindfulness has been the target of a growing interest in the field of psychology because of its importance in increasing welfare and lessening of psychopathological symptoms. Studies on how mindfulness plays a central role in psychological well-being of individuals, based on a set of competencies or skills that can be learned and practiced, promotes improved health and well-being of individuals. Thus, in order to contribute to the knowledge of the relationship between mindfulness, self-pity, shame and psychopathology in non-practitioners and practitioners of meditation / yoga, it was held a series of studies on a sample of 121 subjects, in which 53 were part of a population practicing meditation / yoga and 68 belong to the general population not practicing meditation / yoga. The results show that individuals who practice meditation / yoga recorded significantly higher values in the watch and not react aspects of mindfulness scale. In turn, subjects with higher trait mindfulness have lower levels of external and internal shame. In addition, individuals with higher trait mindfulness differ significantly from individuals with low trait mindfulness of the present higher levels of self-pity and lower levels of depression, anxiety and stress.

Intern kontroll: En fallstudie på Trafikverket

Internal control is something that’s grown more important for enterprises to keep in mind. The community is increasingly affected by the IT-development which demands a bigger degree of security. Enterprises needs to make sure that their systems are up to date and secure enough to keep it safe from unauthorized to take part of sensitive information. Internal control can exist in a major part of the work. If an enterprise have a goal for no harm or serious injury at work, internal control is necessary to reach that goal. The purpose for this essay is to examine how five different departments of Trafikverket practices internal control. How internal control is described. How the guidance from the managements is described and how it reaches the rest of the enterprise. This will lead to a proposal of improvement of the internal control at Trafikverket. We focus our frame of reference on the COSO-model and its five components. The components included in the COSO-model are control environment, risk valuation, control activities, information and communication and monitoring. The essay is a case-study of Trafikverket. We have chosen a qualitative method and interviewed five respondents from the different departments on Trafikverket. The respondents we interviewed works with internal control in their everyday work or have a god insight in the subject. We used a semi structured interview guide with questions based on the COSO framework. The results from our study shows that it exist big variations between how the departments work with internal control. It emerged that there are new guidelines for how the work should be done. This makes it necessary with education to implement the new ways to work. How the departments use the COSO-model varies. Some of them have incorporated the model in their new ways to work others have never heard of it. The conclusion of our study shows that the COSO-model and it´s components contribute to a functioning internal control. Implementing the components is important and the most important feature to good internal control is the corporate management. Education within the enterprise is the most effective way to inform the staff about the model and to implement it.

A Comunicação Interna: a eficácia dos meios de comunicação interna na Caixa Geral de Depósitos

No mundo actual, onde a concorrência cresce e a oferta de produtos aumenta, onde a globalização é palavra de ordem, torna-se essencial pensar a sobrevivência das empresas como estando dependentes da adopção de comportamentos transparentes diante dos públicos, sejam eles de dimensão interna e/ou externa. Reconhecer a importância de controlar os aspectos imprevisíveis a que as empresas estão sujeitas, permite às organizações um maior controlo na previsão dos problemas, como os corrigir antes que estes interfiram no seu sucesso, constituindo assim um ambiente previsível e favorável. A comunicação assume pois um papel primordial na visibilidade positiva de uma empresa. O cliente interno, neste trabalho, será visto como fornecedor de uma rede interna de prestação de serviços, responsável pela agregação de valor aos produtos e serviços oferecidos pela organização. Os clientes internos são também vistos como detentores de um propósito comum responsável tanto pela criação como pela continuidade da organização. Ao longo deste trabalho é descrita e focada a ligação especial que existe entre a comunicação empresarial, a comunicação interna e a estratégia do marketing interno evidenciando a importância destes para as organizações. O objectivo deste estudo é analisar a eficácia dos meios de comunicação interna na Caixa Geral de Depósitos, a partir da realização de 39 inquéritos administrados a colaboradores de uma Agência. Os resultados obtidos com este estudo deram ênfase à eficácia dos meios de comunicação interna utilizados na organização em estudo, concluindo que a comunicação deve ser veiculada de acordo com a utilidade das funções a desempenhar. / In today´s world where competition grows and the supply of products increases, where globalization is a slogan, it is essential to consider the survival of business as being dependent of the adoption of transparent behavior in public, in they internal or external dimensions. Recognizing the importance of controlling the unpredictable aspects that companies are subject, allows organizations greater control in forecast the problems, how to correct them before they interfere with their success, providing a predictable and favorable ambient. Communication assumes an essential role in a positive visibility of a company. The internal customer, this work will be seen as a provider of internal network services, responsible for adding value to products and services offered by the organization. Internal customers are also seen as having a common purpose as much responsible for creating the continuity of the organization. Throughout this work is focused and described the special bond that exists between corporate communication, internal communication and internal marketing strategy, highlighting their importance for the organizations. The aim of this study is to analyze the effectiveness of internal communication in the CGD, from conducting 39 surveys administered to employees of an Agency. The results of this study emphasized the effectiveness of internal communication in the organization used in the study, concluding that the communication should be conveyed according to the usefulness of the tasks.

Racionalidade substantiva no processo decisório: um estudo em instituições que lidam com o tratamento oncológico infantojuvenil na cidade de Natal-RN

The present study regards an applied social research (qualitative) performed in two institutions which lead children s cancer treatment in Natal, Rio Grande do Norte. The main goal of this study is, as of a literature review at works which characterizes the first generations of study about substantive rationality, to detect Decision Making process related aspects that may serve as a basis to elaborate analysis categories from decision making process, aggregating them into a new study that may provide an advance to the theme in administrative science. The academic works based on the analysis model created by Mauricio Serva served as a basis to deep research into such theme, which verifies the predominant rationality in eleven administrative internal processes in productive organizations. This dissertation intends to go beyond the identification of the predominant rationality by elaborating new categories of analysis, and making possible the continuity of the subject in administrative science. Based on Guerreiro Ramos s work, which sees a kind of ideal organization, as known as isonomies, this study still calls upon Karl Polanyi s thoughts, which with the objective of comprehending the independent economic phenomenon of the value that allows considering non-market economies, find that the economy of the men is submerged in his social relations; it also rescues the studies from Max Weber who investigates the meaning of social action to better understand the rationality, and refers to the study of Jürgen Habermas, who proposes a broader conception about rationality, within the theory of communicative action. As a result of this theme s review, seven analysis categories of the decision making process have been formulated. They were applied in the institutions that had been chosen and helped to detect the type of predominant rationality in the categories of the decision making process. The results confirm that, although the decisions making process involves rational elements, such as information, identification of alternatives, there are also specific values of each individual with his experience and view oh the world, permeated not only by instrumental rationality, but also by substantive rationality. The study has verified that two similar institutions may show different types of rationality in the decision making process, when decision factors may tend to instrumental rationality, according to administration classic way, as well as they may emerge from substantive rationality, thus contributing to the process of emancipation of the human being in his sphere of work

Comunicação interna em empreendimento hoteleiro: um enfoque gerencial

Globalization, which increased the market to a position of competition and change never before experienced, also imposed a series of changes that have transformed the social systems, organizations increasingly complex. In this scenario, communication has received attention from modern managers. Research indicates that some sectors of activity, more than others, rely on communication as a tool for achieving their goals. The tourism sector, located in the service segment is configured as one of these activities, which the hotel is part of the composite product. With the intention to acknowledge these aspects in this study sought to analyze the characteristics of internal communication in a hotel project in the managerial perspective. To try to answer this purpose we constructed a framework based on authors that discuss organizational communication, internal communication and hotel businesses. For the purpose of research was chosen a unit of study to assess the views of managers regarding the issue. In the unit studied was sought to apprehend these meanings through interviews with a group of managers in the organization and analysis of documents. Data were analyzed through content analysis of Bardin (1977), with the technique of categorical analysis, as it sought to capture aspects that allow the description of the contents of the messages. The results pointed to an organizational reality based heavily on orality, who lives constantly with noise and using communication to regulate behavior. With little or no reflection on managerial communication inferred that subordinates should not absorb the message completely, a phenomenon that can not be responsible for the complete fulfillment thereof. Moreover, it was realized that the organization studied did not plan your communication, since, yet the views as a strategic tool to achieve your goals

PET e PET/CT com FDG: comparação de duas bases de dados de referência do normal com SUV

Mestrado em Medicina Nuclear - Área de especialização: Tomografia por Emissão de Positrões

Exclusão social e projetos habitacionais. Um estudo sobre conjuntos habitacionais, segregação e exclusão social em Natal/RN

In Natal s urban growth process it is given that the performance period of the National Housing Bank (BNH, 1964-1986) was marked by the intense expansion of the urban grid and configuration of outskirts, through the construction of social housing developments. Implanted in segregated areas of the existing formal city, the population installed in these complexes was also excluded from their rights, considering that the housing defines itself not only by the physical dwelling, but also by its access to urban infrastructure, facilities, services, and others. From this reality and the verification of the city s exclusion and sociospatial segregation processes, we aimed to quantitatively demonstrate levels of social exclusion in Natal, based on the methodology developed by Sposati (2000) and adapted by Genovez (2002), which relates IBGE s (Brazilian Institute of Geography and Statistics) database underlying variables such as income, schooling and dwelling s quality. The research unveiled some spatial patterns promoted by the social housings: in these areas islands were developed with higher indicators than surrounding areas, revealing internal hierarchies in the city s outskirts

O papel da auditoria interna nas insituições públicas de ensino superior em Portugal continental - universidade e politécnicos

Mestrado em Auditoria

A internacionalização de empresas portuguesas de TIC: aplicação a um caso de estudo

O processo da Internacionalização pode ser definido como a execução de operações no estrangeiro conducentes a movimentos de fatores de produção de um país para outro. A globalização dos mercados e a frequente instabilidade da realidade macroeconómica do mercado interno, em concomitância com a sua reduzida dimensão, têm levado a que muitas empresas portuguesas iniciem uma política de expansão internacional. De facto, a exploração de mercados internacionais revelou-se, do ponto de vista das empresas, crucial no sentido de contornar os constrangimentos decorrentes de um mercado interno restrito e cada vez mais saturado. No entanto, a decisão da companhia em internacionalizar, requer do respetivo decisor de topo uma análise cuidada de toda a informação relativa ao processo de internacionalização, incluindo a escolha dos mercados, as estratégias, formas de entrada e os obstáculos. Neste relatório, depois de sistematizar o conhecimento relacionado com a internacionalização, é efetuada uma aplicação deste conhecimento num caso de estudo relacionado com uma empresas portuguesa que presta serviços na área das tecnologias de informação e comunicação e que se tenciona expandir para mercados no estrangeiro.