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Environmental and Durability Perspective of the Use of Curaua Fiber Treated in Mortars

Journal of Renewable Materials 2022年第9期10卷 2409-2429页

作者： Afonso R.G.de Azevedo Marcelo Nascimento Dirlane do Carmo Markssuel T.Marvila Gustavo de C.Xavier sergio neves monteiro UENF-State University of the Northern Rio de Janeiro LECIV-Civil Engineering LaboratoryCampos dos GoytacazesBrazil UFF-Federal Fluminense University TER-Department of Agricultural EngineeringNiteróiBrazil UENF-State University of the Northern Rio de Janeiro LAMAV-Advanced Materials LaboratoryCampos dos GoytacazesBrazil IME-Military Institute of Engineering Department of Materials ScienceRio de JaneiroBrazil

The use of natural lignocellulosic fibers(NLFs)as a reinforcement mechanism for cementitious composites,such as mortar,has been investigated in the last ***,their application has often been restricted to technological evaluation research.A NLF with great potential the curaua,which after treatment with NaOH solution,proved to be technologically feasible for mortars reinforcement based on cement and *** objective of this research was the comparative evaluation between a traditional mortar,based on cement and lime,with 1:1:6:0.8 ratio of cement:lime:sand:water,and a modified mortar with addition of 2 wt.%treated curaua fiber in cement mass by evaluating environmental and durability *** a curing time for 28 days,environmental assessments were carried out and durability methodologies were *** tests performed were:(i)attack by chlorides and sulfate,(ii)the wetting and drying cycles,and(iii)slake durability *** results showed that the mortar with the addition of curaua fiber presented a similar behavior to the reference mixture,both in terms of environmental and durability *** modified mortar is able to be used in internal and external environments,the latter with some ***,it also contributes to the promotion of sustainable use of curaua fiber.

关键词： Natural lignocellulosic fibers curaua mortar durability environmental aspects

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香椿的树木年轮宽度与超年生殖行为的相互关系:对树轮学研究的警示

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Journal of Plant Ecology 2024年第1期17卷 165-171页

作者： Monique Silva Costa Thaís Jorge de Vasconcellos Claudio sergio Lisi Arno Fritz neves Brandes Mario Tomazello-Filho Cátia Henriques Callado Instituto de Aplicação Fernando Rodrigues da Silveira Universidade do Estado do Rio de JaneiroRua Barão de Itapagipe96.Rio Comprido 20261-005Rio de JaneiroBrazil Laboratório de Anatomia Vegetal Universidade do Estado do Rio de JaneiroRua São Francisco Xavier524Maracanã20550-013Rio de JaneiroBrazil Departamento de Biologia Universidade Federal de SergipeAv.Marechal Rondon s/n-Rosa Elze.São Cristóvão 49100-000SergipeBrazil Departamento de Biologia Geral Universidade Federal FluminenseRua Prof.Marcos Waldemar de Freitas ReisS/N.Gragoatá24210-201Rio de JaneiroBrazil Escola Superior de Agricultura Luiz de Queiroz Universidade de São PauloAv.Pádua Dias11.Piracicaba 13418-900São PauloBrazil

资源分配到生殖过程涉及到生态和进化因素,可能会减少植物的营养生长。这种相互关系在自然界中不容易观察到,因为有许多参数可以限制生殖结构的产生或生物量的增加。我们将香椿(Cedrela odorata L.,楝科)在里约热内卢州大西洋森林中的... 详细信息

资源分配到生殖过程涉及到生态和进化因素,可能会减少植物的营养生长。这种相互关系在自然界中不容易观察到,因为有许多参数可以限制生殖结构的产生或生物量的增加。我们将香椿(Cedrela odorata L.,楝科)在里约热内卢州大西洋森林中的树木年轮宽度与超年生殖行为相关联。总体而言,生殖结构的发育发生在湿润的年份,在生长季初期没有出现水分亏缺。然而,在这些年份,树木年轮宽度较小。这些结果可能与树木年轮宽度与当地气候之间缺乏相关性有关。因此,我们强调在径向生长研究中纳入生殖数据的重要性,以扩大对热带森林生长变异性的理解。

关键词：植物生长策略树木年轮学树木生态学生殖权衡

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Genetic Diversity of Uropathogenic Escherichia coli Isolated from Human T Lymphotropic Virus Type I (HTLV-I) Infected Individuals

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Advances in Infectious Diseases 2016年第4期6卷 163-173页

作者： Andréia Santos Silva Elizabeth de Souza neves Maria Cristina Lourenç o Márcia dos Santos Guimarã es Debora Ribeiro de Souza Santos Adriana Hamond Regua-Mangia Escola Nacional de Saúde Pública sergio Arouca Funda&ccedil ã o Oswaldo Cruz Rio de Janeiro Brazil Instituto Nacional de Infectologia Funda&ccedil ã o Oswaldo Cruz Rio de Janeiro Brazil Instituto Nacional de Controle de Qualidade em Saúde Funda&ccedil ã o Oswaldo Cruz Rio de Janeiro Brazil

Urinary tract infection (UTI) is a frequent pathology among HTLV-I+ individuals being capable of severely compromising the kidneys and bladder. Molecular characteristics of uropathogenic Escherichia coli (UPEC) from HTLV-I+ infected individuals are unknown. UPEC isolates from HTVL-I+ individuals, with and without clinical symptoms of myelopathy, were submitted to genetic typing seeking to infer bacterial diversity and potential virulence. 71 bacterial isolates were characterized according to random amplified polymorphic DNA and phylotypes. Phylotyping classified E. coli into four phylogenetic groups: A (18.3%), B1 (16.9%), B2 (39.4%), and D (25.3%) and 8 phylotypes according to the presence of the genetic sequences chuA, yjaA and the DNA fragment TSPE4.C2: ﹣﹣﹣ (5.6%) and ﹣+﹣ (12.6%) in phylogroup A, ﹣﹣+ (7.0%) and ﹣++ (9.8%) in B1, +++ (32.3%) and ++﹣ (7.0%) in B2, +﹣﹣ (15.4%) and +﹣+ (9.8%) in D. The B2 phylogroup was the most prevalent among HTLV﹣ associated myelopathy and asymptomatic individuals. RAPD-PCR typing revealed a high degree of bacterial polymorphism indicating a non-clonal origin. Genotypes were not found to be distributed according to clinical status or epidemiological features. Our results lead us to suggest that the neurological impairment in HTLV-I+ individuals can be a risk factor for urinary infections due E. coli which are caused by distinct bacterial lineages.

关键词： Uropathogenic Escherichia coli Genetic Diversity Phylotype HTLV-I+

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