oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 37 )

2019 ( 258 )

2018 ( 300 )

2017 ( 332 )

Custom range...

Search Results: 1 - 10 of 246720 matches for " Jorge R.;Hoffmann "
All listed articles are free for downloading (OA Articles)
Page 1 /246720
Display every page Item
The presence of Lutzomyia longipalpis in a focus of American visceral leishmaniasis where the only proven vector is Lutzomyia cruzi. Corumbá, Mato Grosso do Sul State
Santos Soraya Oliveira dos,Arias Jorge R.,Hoffmann Marta de Paiva,Furlan Mara Beatriz Grotta
Revista da Sociedade Brasileira de Medicina Tropical , 2003,
Abstract: The present communication reports the presence of Lutzomyia longipalpis in Corumbá, Mato Grosso do Sul, where the principal vector is Lutzomyia cruzi.
The presence of Lutzomyia longipalpis in a focus of American visceral leishmaniasis where the only proven vector is Lutzomyia cruzi. Corumbá, Mato Grosso do Sul State
Santos, Soraya Oliveira dos;Arias, Jorge R.;Hoffmann, Marta de Paiva;Furlan, Mara Beatriz Grotta;Ferreira, Wilson Francisco;Pereira, Claucio;Ferreira, Lourival;
Revista da Sociedade Brasileira de Medicina Tropical , 2003, DOI: 10.1590/S0037-86822003000500017
Abstract: the present communication reports the presence of lutzomyia longipalpis in corumbá, mato grosso do sul, where the principal vector is lutzomyia cruzi.
Time Dependence of Ion-Migration Effects in NiCr Resistor Films
U. Smith,R. Hoffmann
Active and Passive Electronic Components , 1978, DOI: 10.1155/apec.5.159
Abstract:
Progressos na viticultura brasileira
Camargo, Umberto Almeida;Tonietto, Jorge;Hoffmann, Alexandre;
Revista Brasileira de Fruticultura , 2011, DOI: 10.1590/S0100-29452011000500017
Abstract: viticulture was introduced in brazil by portuguese settlers in the 16th century, becoming a commercial activity in the south of the country, after 1875. vineyards of american grapes were predominant until the middle of 20th century, when some vitis vinifera varieties were planted. for a long time brazilian viticulture was limited to the southern and southeastern states as a typical temperate culture. in the 1960's viticulture was expanded into the tropical regions of brazil, while there was also an important icrease in the grape growing area in the traditional temperate zones. nowadays the grape growing area in brazil is around 83.700 ha, producing between 1.300 and 1.400 thousand tons. in brazil, grape production is concentrated at the states of rio grande do sul, s?o paulo, pernambuco, paraná, bahia, santa catarina and minas gerais. most of the grape and its products (wine and juice) are consumed by brazilian market. concentrated grape juice and fresh grapes are the main products exported. diversity is the main characteristic of brazilian viticulture: there is a wide genetic diversity on vineyards and grapes are cultivated in different environments, using several production systems and cultural practices. this paper presents a general view of brazilian viticulture and the main technological and innovation advances obtained in grape culture in the last decades. emphasis is on new cultivars, on new techniques and cultural practices used - mostly on tropical viticulture - and on systems of certification for wines and other products from grapes.
Nova ordem para novos conhecimentos: o projeto leibniziano de enciclopédia científica New order for new knowledges: Leibniz's project for a scientific encyclopedia
Jorge Alberto Molina,Edgar Affonso Hoffmann
Scientiae Studia , 2007, DOI: 10.1590/s1678-31662007000100005
Abstract:
Quantifying the efficiency of river regulation
R. R del ,T. Hoffmann
Advances in Geosciences (ADGEO) , 2005,
Abstract: Dam-affected hydrologic time series give rise to uncertainties when they are used for calibrating large-scale hydrologic models or for analysing runoff records. It is therefore necessary to identify and to quantify the impact of impoundments on runoff time series. Two different approaches were employed. The first, classic approach compares the volume of the dams that are located upstream from a station with the annual discharge. The catchment areas of the stations are calculated and then related to geo-referenced dam attributes. The paper introduces a data set of geo-referenced dams linked with 677 gauging stations in Europe. Second, the intensity of the impoundment impact on runoff times series can be quantified more exactly and directly when long-term runoff records are available. Dams cause a change in the variability of flow regimes. This effect can be measured using the model of linear single storage. The dam-caused storage change ΔS can be assessed through the volume of the emptying process between two flow regimes. As an example, the storage change ΔS is calculated for regulated long-term series of the Lule lven in northern Sweden. Full Article in PDF (PDF, 7058 KB) Citation: R del, R. and Hoffmann, T.: Quantifying the efficiency of river regulation, Adv. Geosci., 5, 75-82, doi:10.5194/adgeo-5-75-2005, 2005. Bibtex EndNote Reference Manager XML
Validación del Cuestionario de Maltrato entre Iguales por Abuso de Poder (MIAP) para escolares A self administered survey to assess bullying in schools
Felipe Lecannelier,Jorge Varela,Jorge Rodríguez,Marianela Hoffmann
Revista médica de Chile , 2011,
Abstract: Background: Bullying is common in schools and has negative consequences. It can be assessed using a self-reported instrument. Aim: To validate a Spanish self-reporting tool called “Survey of High School Bullying Abuse of Power” (MIAP). Material and Methods: The instrument has 13 questions, of which 7 are multiple choice, rende-ring a total of 49 items. It was applied to 2.341 children of seventh and eighth grade attending private, subsidized and municipal schools in the city of Concepción, Chile. Expert judge analysis and estimated reliability using the Cronbach Alpha were used to validate the survey. Results: The instrument obtained a Cronbach Alpha coeffcient of 0.8892, classifed as good. This analysis generated four scales that explained 30.9% of the variance. They were called “Witness Bullying” with 18 items, accounting for 11.4% of the variance, “Bullying Victim” with 12 items, accounting for 7.5% of the variance, “Bullying Perpetrator and Severe bullying Victim”, with 10 items explaining 6.4% of the variance and “Aggressor Bullying” with 6 items accounting for 5.7% of the variance. Conclusions: The MIAP can recognize four basic factors that facilitate the analysis and understanding of bullying, with good levels of reliability and validity. The remaining questions also deliver valuable information.
Sex differences in slow-wave electroencephalographic activity (SWA) in adolescent depression
Jorge Lopez,Robert Hoffmann,Graham Emslie,Roseanne Armitage
Mental Illness , 2012, DOI: 10.4081/mi.2012.e4
Abstract: Sleep disturbance, present in more than 90% of major depressive disorder (MDD) patients, are moderated by sex in adult MDD. In particular, slow-wave electroencephalographic activity (SWA; 0.5-4 Hz) accumulation is low and dissipation impaired. This SWA abnormality in depressed adult males does not change with age, suggesting that SWA abnormality appears at early ages. The present study evaluated sex differences in SWA in adolescents with MDD compared to healthy controls. We evaluated regularized sleep-wake schedules at home for 5-7 days, followed by two consecutive nights of sleep EEG recording. The study included 104 participants, 52 symptomatic and depressed subjects (MDD: 20 males and 32 females) and 52 healthy controls (HC: 20 males and 32 females), aged 13-18 years. SWA power and dissipation, and duration and latencies to each Non-Rapid Eye Movement (NREM) sleep period were calculated for each group. Results showed that SWA accumulation in the first NREM period was lower and its dissipation across the night more irregular in MDD males compared to HC males (P<0.009). By contrast, SWA was equivalent in MDD and HC females. In conclusion, as reported in adult MDD, the accumulation and dissipation of SWA was abnormal in depressed adolescents, but only in males. SWA abnormalities in adolescent MDD may relate to different depressive symptoms in females and males. These results underscore the need to develop sex-specific therapies to enhance and restore SWA in depressed adolescents
Identification and characterization of aging products in the glyoxal/ammonium sulfate system – implications for light-absorbing material in atmospheric aerosols
C. J. Kampf, R. Jakob,T. Hoffmann
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2012,
Abstract: In this study we report the identification of bicyclic imidazoles in aqueous aerosol mimics using HPLC-ESI-MS/MS. 2,2'-Biimidazole was identified to be a major contributor to the 280 nm absorbance band observed in mixtures of glyoxal and ammonium sulfate, despite the fact that its production rate is two orders of magnitude lower than the previously reported production rates of imidazole or imidazole-2-carboxaldehyde. The molar absorptivity of 2,2'-biimidazole was determined to be (36 690 ± 998) M 1 cm 1. This demonstrates the necessity of molecular product identification at trace levels to enable a better understanding of relevant absorbing species. Additionally, the formation of lower polarity products including formamides of imidazoles is proposed. The role of imidazoles and other light-absorbing species in the formation of SOA and optical properties of SOA is discussed and potentially interesting fields for future investigations are outlined.
Synthesis of glycosylated β3-homo-threonine conjugates for mucin-like glycopeptide antigen analogues
Florian Karch,Anja Hoffmann-R?der
Beilstein Journal of Organic Chemistry , 2010, DOI: 10.3762/bjoc.6.47
Abstract: Glycopeptides from the mucin family decorated with tumour-associated carbohydrate antigens (TACA) have proven to be important target structures for the development of molecularly defined anti-cancer vaccines. The strategic incorporation of β-amino acid building blocks into such mucin-type sequences offers the potential to create pseudo-glycopeptide antigens with improved bioavailability for tumour immunotherapy. Towards this end, TN and TF antigen conjugates O-glycosidically linked to Fmoc-β3-homo-threonine were prepared in good yield via Arndt–Eistert homologation of the corresponding glycosyl α-amino acid derivative. By incorporation of TN-Fmoc-β3hThr conjugate into the 20 amino acid tandem repeat sequence of MUC1 using sequential solid-phase glycopeptide synthesis, a first example of a mixed α/β-hybrid glycopeptide building block was obtained. The latter is of interest for the development of novel glycoconjugate mimics and model structures for anti-cancer vaccines with increased biological half-life.
Page 1 /246720
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.