320 research outputs found
The Mn site in Mn-doped Ga-As nanowires: an EXAFS study
We present an EXAFS study of the Mn atomic environment in Mn-doped GaAs
nanowires. Mn doping has been obtained either via the diffusion of the Mn used
as seed for the nanowire growth or by providing Mn during the growth of
Au-induced wires. As a general finding, we observe that Mn forms chemical bonds
with As but is not incorporated in a substitutional site. In Mn-induced GaAs
wires, Mn is mostly found bonded to As in a rather disordered environment and
with a stretched bond length, reminiscent of that exhibited by MnAs phases. In
Au-seeded nanowires, along with stretched Mn-As coordination we have found the
presence of Mn in a Mn-Au intermetallic compound.Comment: This is an author-created, un-copyedited version of an article
accepted for publication in Semiconductor Science and Technology. IOP
Publishing Ltd is not responsible for any errors or omissions in this version
of the manuscript or any version derived from it. The definitive
publisher-authenticated version is available online at
doi:10.1088/0268-1242/27/8/08500
Towards a Geological Information System: the CARGeo System and the Regione Lombardia Geological Database.
In the framework of the national mapping program «CARGNew
Italian Geological Map at 1:50.000 scale», Regione Lombardia is
generating a detailed map (1:10.000 scale) of its territory. Surveying
criteria have been carefully defined in order to produce homogeneous
geological maps: geological survey has been performed at the
1:10.000 scale, and data have been stored in a GIS-oriented database.
The detailed survey scale improved the geological knowledge: the
new maps represent an important tool for territorial planning requirements
of public administrations and engineering geologists (e.g. in
hydrogeological and seismic risk evaluation).
Field geologists performed data input in the geological data
base by alternating field campaigns and data input throughout the
year, taking advantage of periods when field activities are slackened
(i.e. according to climate conditions). In this way, data entry is
nearly synchronous with data collection, and field data become
quickly accessible. Data entry by the field geologists on one side
slows down the field activity, however, it guarantees a precise digitalization
of geometric data and a correct attribute assignment, allowing
to optimize working time.
To allow the data entry to non-GIS-specialized users, we developed
an ArcViewÂź-VisualBasicÂź-MSAccessÂź application, enabling the
simultaneous acquisition of geometric and alphanumeric data. Data
base management and cartographic production are performed with
ArcInfoÂź, through specific procedures which, after data reorganization
and control (both alphanumeric and geometric), lead to the final
cartographic output at different scales.
The 1:10.000 geological database is migrated in the ArcSDE
structure and prepared for data view, query and download
(www.cartografia.regione.lombardia.it/cargweb) using ESRI (ArcIMS)
tools.
From the 1:10.000 geological database we derived the database
for the 1:50.000 CARG maps by both automatic and manual generalization
according to the CARG-APAT standards. During the different
phases of the project, several problems arose, due to both
project organization and data storage system (from data collection
in the field to elaboration and digitalization, and, in case, to final publication).
â Data collection: the survey activity was divided between «bedrock
» and «quaternary» specialists. The double survey provided a
high-quality geological description of the territory, but slowed the
generation of the data-flow. Based on this experience, the last assigned
areas are surveyed by a single geologist, under the supervision
of quaternary and bedrock experts.
â Users feedback: geologists are normally used to draw their
maps on paper; learning how to produce electronic maps can be difficult,
and the software tools have to be studied very carefully and
present user friendly interfaces. Nevertheless, in our experience, a
training period has to be planned, and geologists have to be supported
by a GIS expert, who can understand their needs and modify the
software accordingly.
â System architecture: the ArcViewÂź-VisualBasicÂź-MSAccessÂź
(Windows platform) â ArcInfoÂź (UNIX platform) environment, revealed
problems in the client-server stability of an earlier version; some
unsolved troubles remain, mainly related to the network architecture.
The presence in the CARG-Regione Lombardia crew of consultant
geologists, experienced and trained in collection, analysis and data entry
in the final database, accelerated the critical phases of:
â Data base derivation from Regione Lombardia dataset to CARG-APAT standard
Alteração nos teores de carbono e fósforo orgùnico em um Latossolo após 23 anos sob diferentes preparos de solo e culturas de inverno
O fĂłsforo (P) orgĂąnico Ă© importante fonte de fosfato para as plantas, tanto em ambientes naturais quanto em solos cultivados. O cultivo de plantas com alta capacidade de reciclagem de P pode aumentar a importĂąncia das formas orgĂąnicas na disponibilização de fosfato, especialmente quando o solo nĂŁo Ă© revolvido O presente estudo objetivou avaliar em um solo muito argiloso sob longo perĂodo de cultivo (i) o efeito de diferentes preparos de solo e (ii) o efeito do cultivo de diferentes espĂ©cies de plantas de inverno, no teor de carbono e fĂłsforo orgĂąnico do solo. Em 1986 foi estabelecido o experimento com seis tratamentos de inverno (tremoço azul, ervilhaca peluda, aveia preta, nabo forrageiro, trigo e pousio) implantados num Latossolo Vermelho AluminofĂ©rrico na regiĂŁo sudoeste do ParanĂĄ, sob sistema plantio direto (SPD) e sistema de cultivo convencional (SCC). As amostras de solo foram coletadas em outubro de 2009 em cinco profundidades (0-5, 5-10, 10-20, 20-30 e 30-40 cm). Sistemas de manejo do solo conservacionistas, como o SPD, aumentam o teor de carbono e fĂłsforo orgĂąnico total do solo da camada superficial comparativamente ao SCC, mas nĂŁo Ă© suficiente para recuperar os teores de carbono orgĂąnico total original do solo sob mata nativa. O cultivo de plantas durante o inverno aumenta o teor de carbono orgĂąnico total do solo independentemente do sistema de manejo de solo adotado, mas nĂŁo altera o teor de P orgĂąnico total do solo estimado pelo mĂ©todo de ignição
The Assertive Brain : Anterior Cingulate Phosphocreatine plus Creatine Levels Correlate With Self-Directedness in Healthy Adolescents
Despite various advances in the study of the neurobiological underpinnings of personality traits, the specific neural correlates associated with character and temperament traits are not yet fully understood. Therefore, this study aims to fill this gap by exploring the biochemical basis of personality, which is explored with the temperament and character inventory (TCI), during brain development in a sample of adolescents. Twenty-six healthy adolescents (aged between 13 and 21 years; 9 males and 18 females) with behavioral and emotional problems underwent a TCI evaluation and a 3T single-voxel proton magnetic resonance spectroscopy (1H MRS) acquisition of the anterior cingulate cortex (ACC). Absolute metabolite levels were estimated using LCModel: significant correlations between metabolite levels and selective TCI scales were identified. Specifically, phosphocreatine plus creatine (PCr+Cre) significantly correlated with self-directedness, positively, and with a self-transcendence (ST), negatively, while glycerophosphocholine plus phosphocholine (GPC+PC) and myo-inositol negatively correlated with ST. To the best of our knowledge, this is the first study reporting associations of brain metabolites with personality traits in adolescents. Therefore, our results represent a step forward for personality neuroscience within the study of biochemical systems and brain structures
IFI16 reduced expression is correlated with unfavorable outcome in chronic lymphocytic leukemia
Chronic lymphocytic leukemia (CLL) is the most common leukemia in adults. Its clinical course is typically indolent; however, based on a series of pathobiological, clinical, genetic, and phenotypic parameters, patient survival varies from less than 5 to more than 20 years. In this paper, we show for the first time that the expression of the interferon-inducible DNA sensor IFI16, a member of the PYHIN protein family involved in proliferation inhibition and apoptosis regulation, is associated with the clinical outcome in CLL. We studied 99 CLLs cases by immunohistochemistry and 10 CLLs cases by gene expression profiling. We found quite variable degrees of IFI16 expression among CLLs cases. Noteworthy, we observed that a reduced IFI16 expression was associated with a very poor survival, but only in cases with ZAP70/CD38 expression. Furthermore, we found that IFI16 expression was associated with a specific gene expression signature. As IFI16 can be easily detected by immunohistochemistry or flow cytometry, it may become a part of phenotypic screening in CLL patients if its prognostic role is confirmed in independent series
Dutch elementary school childrenâs attribution of meaning to written pseudowords
Grade two through six elementary school Dutch children were asked to perform a lexical decision task including 90 pseudowords constructed by changing one or two letters in a Dutch word. Subsequently, the children were asked about the meaning of pseudowords they had not crossed out and that they, apparently, had considered to be words. Multiple regression analyses on the lexical decision task showed that the older children were more hindered by the morphemic structure of a pseudoword than by its orthographic neighbors. The younger children, in contrast, were less hindered by the morphemic structure of a pseudoword and more hindered by its orthographic neighbors. Word length was a (small) predictor only for grade 6. Moreover, the answers of the children reflected that in their construction of meanings for the pseudowords they were hindered both by the morphemic structure and by the orthographic neighbors of the pseudowords
Clinical and experimental efficacy of gemtuzumab ozogamicin in core binding factor acute myeloid leukemia
Leukemia-initiating cells of core binding factor (CBF) acute myeloid leukemia (AML) likely derive from early committed hematopoietic precursors expressing CD33. As such, targeting CD33 could ameliorate the chance of cure of CBF AML patients. We compared 12 CBF AML patients treated with Fludarabine, Cytarabine, Idarubicin and Gemtuzumab Ozogamicin (FLAI-GO regimen) with 25 CBF AML patients treated with the same schedule, but without GO. With the limit of small numbers, we observed a consistent trend toward better overall survival, disease free survival and event free survival in the FLAI-GO group. We also demonstrated the ability of GO to induce the disappearance in vitro of the AML1-ETO molecular transcript in a polymerase chain reaction-positive graft without decreasing the clonogenic potential of CD34+/CD38- cells. This represent the proof of principle for using GO in a purging strategy before autologous stem cell transplantation. Therefore, our data argue in favor of the reinstitution of GO in the therapy of CBF AML
Produção e composição do mosto de videiras submetidas Ă adição de doses de nitrogĂȘnio via fertirrigação e seguido de irrigação.
XV Congresso Latino-Americano de Viticultura e Enologia E XIII Congresso Brasileiro de Viticultura e Enologia. Bento Gonçalves-RS, 3 a 7 de Novembro de 2015
Composição do mosto de videiras submetidas a modos de fornecimento de nitrogĂȘnio em solo arenoso.
XV Congresso Latino-Americano de Viticultura e Enologia E XIII Congresso Brasileiro de Viticultura e Enologia. Bento Gonçalves-RS, 3 a 7 de Novembro de 2015
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