检索结果-南通市图书馆

Abiotic and Biotic Stresses and Changes in the Lignin Content and Composition in Plants

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2010年第4期52卷 360-376页

作者： Jullyana Cristina Magalhaes Silva Moura cesar augusto Valencise Bonine Juliana de Oliveira Fernandes Viana Marcelo Carnier Dornelas Paulo Mazzafera Departamento de Biologia Vegetal Instituto de BiologiaUniversidade Estadual de Campinas Votorantim Celulose e Papel S.A. 14210-000Luis AntonioSPBrazil

Lignin is a polymer of phenylpropanoid compounds formed through a complex biosynthesis route, represented by a metabolic grid for which most of the genes involved have been sequenced in several plants, mainly in the model-plants Arabidopsis thaliana and Populus. Plants are exposed to different stresses, which may change lignin content and composition. In many cases, particularly for plant-microbe interactions, this has been suggested as defence responses of plants to the stress. Thus, understanding how a stressor modulates expression of the genes related with lignin biosynthesis may allow us to develop study-models to increase our knowledge on the metabolic control of lignin deposition in the cell wall. This review focuses on recent literature reporting on the main types of abiotic and biotic stresses that alter the biosynthesis of lignin in plants.

关键词： Abiotic and Biotic Stresses and Changes in the Lignin Content and Composition in Plants

Utilization of Pineapple Crown Fiber and Recycled Polypropylene for Production of Sustainable Composites

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2020年第10期8卷 1327-1341页

作者： Alexandra Augusta Reichert Mariana Ribas de Sá Gabriela Escobar Hochmuller da Silva cesar augusto Gonçalves Beatrice AndréRicardo Fajardo Amanda Dantas de Oliveira Postgraduate Program in Materials Science and Engineering(PPGCEM) Federal University of Pelotas(UFPel)Pelotas96075-630Brazil Technology Development Center(CDTec) Materials EngineeringFederal University of Pelotas(UFPel)Pelotas96075-630Brazil Postgraduate Program in Materials Science and Engineering(PPGCEM) Federal University of São Carlos(UFSCar)São Carlos13565-905Brazil Laboratory of Technology and Development of Composites and Polymeric Materials Federal University of Pelotas(UFPel)Pelotas96010-900Brazil

Nowadays,the production of consumer goods is based on the use of non-renewable raw materials,which in recent years has been performing as a problem for the *** the large number of available biofibers in nature,their use in the development of polymeric composites has inevitably emerged,it is also necessary to take into account the countless discarded plastics that still have the potential to be *** this work,fibers were extracted from pineapple crown residues and utilized to compose sustainable composites using recycled polypropylene from cups discarded in the trash as a ***,it is known that for good performance,it is necessary to achieve a good chemical interaction between the fiber and the *** order to improve this interaction,alkaline mercerization treatment was carried out on the surface of the fibers removing some components incompatible with the *** this work,the effect of the mercerization treatment on the properties of the fibers was studied,as well as their interaction with the *** effect of fiber concentration on the mechanical and thermal properties of composites was also *** of 5 and 7 wt%were used for both natural and mercerized fibers.A decrease in the number of degradation stages was observed through thermogravimetry analyses(from four in natural fiber to two in mercerized fibers),showing that the mercerization performed on the fibers was *** increase in the degree of crystallinity of mercerized fibers was also observed through the results of X-ray *** techniques indicate that amorphous compounds,such as hemicellulose and lignin,were partially *** the tensile test,it could be noted that all composites presented higher values of de elastic modulus than recycled polypropylene without added load;however,there were no differences in the elastic modulus between the different types of fibers and load ***,it is interesting to use fibers as r

关键词： Recycling composites polypropylene biofibers pineapple crown

Biochar influences the cane fields’microbiota and the development of pre-sprouted sugarcane seedlings

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2023年第1期5卷 75-88页

作者： Bruna Cristina Pinto Adriana Barboza Alves Osania Emerenciano Ferreira Gustavo Henrique Gravatim Costa Magno Andréde Oliveira augusto cesar da Silva Bezerra Alan Rodrigues Teixeira Machado Postgraduate Program in Environmental Sciences State University of Minas GeraisFrutal UnityFrutalMinas Gerais38202-436Brazil Department of Agricultural and Biological Sciences State University of Minas GeraisFrutal UnityFrutalMinas Gerais38208-436Brazil Postgraduate Program in Geotechnical Engineering Federal University of Ouro PretoOuro PretoMinas Gerais35400-000Brazil Department of Transport Engineering Federal Center for Technological Education of Minas GeraisBelo HorizonteMinas Gerais30421-169Brazil Department of Exact Sciences State University of Minas GeraisJoão Monlevade UnityJoão MonlevadeMinas Gerais35930-314Brazil

This research investigates the soil conditioning effect of sugar cane fields with biochar produced from sugarcane *** influence on the physicochemical and microbiological conditions of the soil and the agronomic performance of sugarcane seedlings was *** this end,the biochar from sugarcane bagasse was produced by pyrolysis in a double drum oven and mixed with soil at rates of 0,1%,3%,and 5%(in weight).The experiment was installed in a greenhouse with two evaluation periods(30 days and 60 days)and five *** pot received a pre-sprouted cane seedling,and the analysis of colony-forming units(bacteria and fungi),physicochemical characteristics of the soil,and growth and development of sugarcane were performed per *** biochar showed a high fixed carbon content(72%)and a specific surface area estimated by the adsorption of methylene blue of 50 m2 g−***,its structure is porous and contains important nutrients(e.g.,CaO,K2O,and P2O5).In the periods evaluated,the applications of the 3%and 5%(in weight)rates of biochar reduced most of the soil fertility ***,the chemical analyses indicated that the sugarcane field soil collected already possessed high *** microbiota was influenced,but only the application of the 3%(in weight)rate at 60 days after planting showed a significant positive effect on the number of bacteria forming units,with an increase of approximately 385%.On the other hand,no significant positive effect on sugarcane development was ***,biochar application in high-fertility sugarcane plantation soil did not result in gains for sugarcane development in the periods evaluated.

关键词： Soil Biometry Microbiology Double drum oven Biochar

Alkaline hydrolyzable nitrogen and properties that dictate its distribution in paddy soil profiles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2020年第3期30卷 326-335页

作者： Gerson Laerson DRESCHER Leandro Souza DA SILVA Qamar SARFARAZ Gustavo DAL MOLIN Laura Brondani MARZARI augusto Ferreira LOPES cesar CELLA Daniela Basso FACCO Rodrigo Knevitz HAMMERSCHMITT Department of Soil Science Federal University of Santa MariaSanta Maria 97105-900Brazil Federal University of Santa Maria Campus Cachoeira do SulCachoeira do Sul 96506-310Brazil

Nitrogen(N) is a key nutrient for rice production, and its bioavailability in paddy soils is strongly coupled to soil organic matter(SOM) cycling. A better understanding of potentially available N forms in soil, such as alkaline hydrolyzable N(AH-N), and their depth distribution will support the development of best management practices to improve the N use efficiency of rice while minimizing adverse environmental effects. Fifteen rice(Oryza sativa L.) fields from Southern Brazil were selected, and stratified soil samples were taken to a depth of 60 cm before crop establishment. Selected soil physical and chemical properties were analyzed to evaluate their relationships with AH-N contents in the soil profile. The AH-N contents below 20 cm varied extensively(increased,reduced, or constant) compared with that above 20 cm. Although clay and clay + silt contents were highly correlated to AH-N for some soils, the major property dictating AH-N distribution by depth was total N(TN), as the correlation between TN and AH-N was mainly by direct effect. The proportion of TN recovered as AH-N across sites and depths presented high amplitude, and thus AH-N was not a constant N pool across depths, indicating that AH-N can be affected by soil management practices even when TN showed no major changes. The distinct distribution of AH-N across soil sampling sites and depths indicates that depths greater than 20 cm should be considered when calibrating the AH-N index for N fertilizer recommendations for flooded rice in Southern Brazil.

关键词： fertilizer recommendation nitrogen availability nutrient management practices organo-mineral interaction Oryza sativa L. soil analysis soil organic matter

China's Global Shipping Connectivity:Internal and External Dynamics in the Contemporary Era(1890–2016)

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2018年第2期28卷 202-216页

作者： cesar DUCRUET WANG Liehui French National Center for Scientific Research UMR 8504 Geographie-citesParis F-75006France The Center for Modern Chinese City Studies East China Normal UniversityShanghai 200062China School of Urban and Regional Science East China Normal UniversityShanghai 200241China

China's global shipping connectivity had been somewhat overlooked as the bulk of related studies predominantly focused on the throughput volume of its own port cities. This article tackles such lacunae by providing a relational perspective based on the extraction of vessel movement archives from the Lloyd's List corpus. Two complementary analyses are proposed: long-term dynamics with all ships included(1890–2008) and medium-term dynamics focusing on container flows(1978–2016). Each analysis examines China's maritime connectivity in various ways and on different spatial scales, from the global to the local, in terms of concentration, vulnerability, and expansion. The main results underline the influence of technological, economic, and political factors on the changing distribution of connectivity internally and externally. In particular, China has managed to reduce its dependence upon external transit hubs, to increase the internal connectivity of its own port system, and to strengthen its dominance towards an increasing number of foreign nodes and trade partners through the maritime network.

关键词： China connectivity maritime network port system vessel movements

Calorimetry is not color-blind. Molecular insights on association processes in surfactant-polymer mixtures derived from calorimetric experiments

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2011年第12期54卷 2024-2027页

作者： LOH Watson BRINATTI cesar Institute of Chemistry Universidade Estadual de Campinas(UNICAMP)

This comment will review and discuss recent results obtained with the use of calorimetry in assessing molecular information from complex phenomena such as association in surfactant/polymer mixtures. These examples were selected to support the view that it is possible to ally the great sensitivity of modem calorimeters with carefully planned experiments and, sometimes, ancillary techniques in order to derive detailed information on molecular interactions.

关键词： calorimetry polymer-surfatant interaction self-assembly

Effective photocatalytic conversion of formic acid using iron,copper and sulphate doped TiO_(2)

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2022年第11期29卷 3592-3607页

作者： ZOUHEIR Morad TANJI Karim NAVIO Jose Antonio HIDALGO María Carmen JARAMILLO-PAEZ cesar augusto KHERBECHE Abdelhak Ecole Supérieure de Technologie de Fès UniversitéSidi Mohammed Ben AbdellahRoute d’ImouzzerBP 2427FèsMaroc Instituto de Ciencia de Materiales de Sevilla(ICMS) Centro Mixto Universidad de Sevilla-CSICAmérico Vespucio 4941092 SevillaSpain

In this paper,the combined addition of copper or iron and sulphate ions onto TiO_(2) prepared by a simple sol-gel method is studied for formic acid photocatalytic conversion.A wide structural and morphological characterization of the different photocatalysts was performed by X-ray diffraction(XRD),N_(2)-physisorption for BET surface area measurements,scanning and transmission electronic microscopies(SEM and TEM),UV-Vis diffuse spectroscopy(DRS)and X-ray photoelectron spectroscopy(XPS),in order to correlate the physico-chemical properties of the materials to their photocatalytic efficiencies for formic acid *** have shown important differences among the catalysts depending on the metal *** TiO_(2)/Cu(1%Cu)was the best photocatalyst obtaining about 100% formic acid conversion in only 5 *** appropriate physico-chemical features of this photocatalyst,given by the addition of combined copper and sulphate ions,explain its excellence in photocatalytic reaction.

关键词： copper iron sulphation doping TiO_(2) photocatalysis

Beneficial effects of adenosine triphosphate-sensitive K^+ channel opener on liver ischemia/reperfusion injury

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第41期20卷 15319-15326页

作者： Mateus Antunes Nogueira Ana Maria Mendona Coelho Sandra Nassa Sampietre Rosely Antunes Patzina Fabiano Pinheiro da Silva Luiz augusto Carneiro D'Albuquerque Marcel Cerqueira cesar Machado Department of Gastroenterology (LIM/37) Medical SchoolUniversity of Sao Paulo Department of Clinical Emergency (LIM/51) Medical SchoolUniversity of Sao Paulo

AIM: To investigate the effect of diazoxide administration on liver ischemia/reperfusion injury.

关键词： Liver ischemia/reperfusion Diazoxide K+ channel opener Mitochondrial ATP-sensitive potassium channel Liver mitochondria

Quite amusing stem cells:Muse cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第11期18卷 2377-2378页

作者： Molly Monsour cesar V.Borlongan University of South Florida Morsani College of Medicine TampaFLUSA Department of Neurosurgery and Brain Repair University of South FloridaMorsani College of MedicineTampaFLUSA

Stem cells may be the future of therapeutics for stroke due to their regenerative and immunomodulatory *** barriers faced when employing stem cells,however,include faulty migration,low cell survival,and diminished proliferation.M ultilineage-differentiating stress ensuring (Muse) cells,a subset of mesenchymal stem cells,overcome these *** cells aid in neuroregeneration,have immense regenerative potential,and are pluripotent,non-tumorigenic,and *** stroke specifically,these cells may restore an a nti-inflammatory environment,regenerate damaged neurons,and integrate into the neuronal *** fact,Muse cells may be aptly designed to ameliorate neurovascular unit damage following stroke and observed in other neuroinflammatory disorders.

关键词： modulator overcome integrate