Consulta: subjectFacets:"Hydrogel"
Registros recuperados: 15
Data/hora: 09/06/2024 10:29:51

Conocimiento local y crecimiento inicial del ojite (Brosimum alicastrum Swartz) bajo distintas condiciones de manejo en la zona de Lomeríos del municipío Paso de Ovejas, Veracruz, México.
Provedor de dados: 32
Autores: Domínguez Lagunes, Maira Antonia.
La investigación se realizó en dos etapas. El objetivo de la primera etapa fue documentar el conocimiento local sobre Brosimum alicastrum como árbol forrajero. Las entrevistas con los ganaderos mostraron que el 83% conocía aspectos ecológicos del árbol, el 9% la biología y un 77% aspectos sobre manejo del árbol; esta especie cayó en el desuso a partir del reparto agrario (1940) cuando la delimitación de las parcelas restringió el acceso a los árboles. Se concluyó que existe conocimiento sobre la utilización del árbol aunque limitado, y que el desarrollo tecnológico propició a que este recurso fuera cayendo en desuso; aunque aún existe interés en recuperarlo y utilizarlo. El objetivo de la segunda etapa considerando la primera, fue analizar el crecimiento...
Palavras-chave: Brosimum alicastrum; Vegetación nativa; Conocimiento local; Zonas rurales; Reservorios; Desuso; Hidrogel; Native vegetation; Local knowledge; Rural zones; Reservoirs; Disuse; Hydrogel; Agroecosistemas Tropicales; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1875

WATER-RETAINING POLYMER MITIGATES THE WATER DEFICIT IN Schinus terebinthifolia: PHOTOSYNTHETIC METABOLISM AND INITIAL GROWTH
Provedor de dados: 70
Autores: Beltramin,Francisco A.; Silva,Willian C.; Santos,Cleberton C.; Scalon,Silvana de P. Q.; Vieira,Maria do C.
ABSTRACT The use of water-retaining polymer (hydrogel) can mitigate the damage to the photosynthetic apparatus and increase the robustness of young plants under water deficit conditions. Thus, the aim of this study was to evaluate the effect of water-retaining polymer on the morphophysiological aspects of Schinus terebinthifolia Raddi submitted to water deficit. The studied water regimes were characterized by three plant irrigation management: 1) control: irrigated daily, 2) stress: water deficit (irrigation suspension) and 3) stress + hydrogel: water deficit + water-retaining polymer. The plants were submitted to irrigation suspension until photosynthesis approached zero [1st P0], followed by resumption of irrigation (REI) for 15 days. After REI, until...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian pink pepper; Cerrado biome; Hydrogel; Physiological plasticity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600684

Enriching a cellulose hydrogel with a biologically active marine exopolysaccharide for cell-based cartilage engineering
Provedor de dados: 5
Autores: Rederstorff, E.; Rethore, G.; Weiss, P.; Sourice, S.; Beck-cormier, S.; Mathieu, E.; Maillasson, M.; Jacques, Y.; Colliec-jouault, Sylvia; Fellah, B. H.; Guicheux, J.; Vinatier, C.
The development of biologically and mechanically competent hydrogels is a prerequisite in cartilage engineering. We recently demonstrated that a marine exopolysaccharide, GY785, stimulates the in vitro chondrogenesis of adipose stromal cells. In the present study, we thus hypothesized that enriching our silated hydroxypropyl methylcellulose hydrogel (Si-HPMC) with GY785 might offer new prospects in the development of scaffolds for cartilage regeneration. The interaction properties of GY785 with growth factors was tested by surface plasmon resonance (SPR). The biocompatibility of Si-HPMC/GY785 towards rabbit articular chondrocytes (RACs) and its ability to maintain and recover a chondrocytic phenotype were then evaluated in vitro by MTS assay, cell counting...
Tipo: Text
Palavras-chave: Cartilage; Hydrogel; Glycosaminoglycan; Marine polysaccharides; Chondrocytes; Tissue engineering.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00303/41449/40650.pdf

An in vitro study of two GAG-like marine polysaccharides incorporated into injectable hydrogels for bone and cartilage tissue engineering
Provedor de dados: 5
Autores: Rederstorff, Emilie; Weiss, Pierre; Sourice, S.; Pilet, P.; Xie, F.; Sinquin, Corinne; Colliec-jouault, Sylvia; Guicheux, Jerome; Laib, S.
Natural polysaccharides are attractive compounds with which to build scaffolds for bone and cartilage tissue engineering. Here we tested two non-standard ones, HE800 and GY785, for the two-dimensional (2-D) and three-dimensional (3-D) culture of osteoblasts (MC3T3-E1) and chondrocytes (C28/I2). These two glycosaminoglycan-like marine exopolysaccharides were incorporated into an injectable silylated hydroxypropylmethylcellulose-based hydrogel (Si-HPMC) that has already shown its suitability for bone and cartilage tissue engineering. Results showed that, similarly to hyaluronic acid (HA) (the control), HE800 and GY785 significantly improved the mechanical properties of the Si-HPMC hydrogel and induced the attachment of MC3T3-E1 and C28/I2 cells when these...
Tipo: Text
Palavras-chave: Glycosaminoglycan; Hydrogel; Polysaccharide; Bone and cartilage tissue engineering; In vitro test.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14090/15747.pdf

Addition of residues and reintroduction of microorganisms in Jatropha curcas cultivated in degraded soil
Provedor de dados: 91
Autores: Santos,Adriana A.; Agustini,José A.; Maltoni,Katia L.; Cassiolato,Ana M. R.
ABSTRACT The aim of this study was to evaluate, through mycorrhization (root colonization and number of spores of arbuscular mycorrhizal fungi - AMF), leaf acid phosphatase and soil chemical characteristics, the effects of the addition of residues (macrophytes and ash), hydrogel and the reintroduction of microorganisms in a degraded area cultivated with jatropha. Degradation occurred when the surface soil was removed during the construction of a hydroelectric power plant. The experiment was set in a randomized block design, using a 2 x 2 x 4 factorial scheme, i.e., two inoculation treatments (with and without soil-inoculum), two hydrogel treatments (with and without) and four with the addition of residues (macrophytes - MAC, ash, MAC + ash and control,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas L.; Arbuscular mycorrhiza; Hydrogel; Macrophytes; Cerrado.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400372

Irrigation levels and use of hydro retainer polymer in greenhouse lettuce production
Provedor de dados: 91
Autores: Silva,Welcio R. da; Salomão,Leandro C.; Pereira,Débora R. M.; Oliveira,Henrique F. E. de; Pereira,Alexandre I. de A.; Cantuario,Fernando S.
ABSTRACT One of the potential alternatives to improve the use of water resources is the use of hydro retainer polymer applied to the soil. The objective of this study was to evaluate how irrigation levels and doses of hydro retainer polymer interfere in the production of ’Vanda’ lettuce. The experiment was carried out from December 2017 to January 2018 under protected environment in the Instituto Federal Goiano, Urutaí Campus, Goiás State, GO, Brazil (17º 29’ 10” S of latitude, 48º 12’ 38” W of longitude and 697 m of altitude). The work tested four irrigation levels of 50, 75, 100 and 125% of the evaporation obtained daily by the hook micrometer and five doses of hydrogel polymer (0, 50, 100, 150 and 200 g plant-1). The experimental design was a randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrogel; Lactuca sativa L.; Water resources.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000600406

Quantitative analysis of growth in coffee plants cultivated with a water-retaining polymer in an irrigated system1
Provedor de dados: 124
Autores: Souza,Antonio Jackson de Jesus; Guimarães,Rubens José; Colombo,Alberto; Sant’Ana,José Antonio do Vale; Castanheira,Dalyse Toledo.
ABSTRACT This study aimed to evaluate the use of hydro polymer retainer in the quantitative growth of coffee plants at different levels of irrigation and soil types. The experiment was conducted in pots with seedlings bag in the greenhouse of the Setor de Cafeicultura, Universidade Federal de Lavras. The experimental design was in randomized blocks in factorial (2x4x2): absence or presence of hydro polymer retainer, four levels of irrigation (25%, 50%, 75% and 100%), two soil types (sandy soil and medium texture). At 150 days evaluated the stem diameter, plant height, leaf area, number of leaves, dry weight of shoots, plant dry mass, root dry weight, root dry weight ratio of shoot, leaf area ratio, absolute growth rate, relative growth rate, net...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil types; Greenhouse; Coffea arabica L.; Hydrogel.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100162

Addition of waste and introduction of microorganisms after 45 years of soil degradation
Provedor de dados: 124
Autores: Santos,Adriana Avelino; Agustini,José Antônio; Maltoni,Kátia Luciene; Cassiolato,Ana Maria Rodrigues.
ABSTRACT The construction of hydroelectric power plants (HPP) may result in environmental problems, such as extensive areas of exposed subsoil and conditions of extreme degradation. These areas require alternative that minimize impact and allow partial recovery of their ecosystem functions and vegetation. This study aimed to evaluate the effects of residue addition (organic/macrophytes - OR and inorganic/ash - AR), hydrogel, and inoculation of microorganisms in degraded soil, cultivated with Jatropha curcas, through fertility and microbial activity. A conserved Cerrado ("savannah") soil was the source of microorganisms - mainly mycorrhizal fungi. The experiment was conducted for 12 months (during 2010/2011) at the farm of UNESP-School of Engineering/Campus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Macrophytes; Sugar cane ash; Hydrogel; Cerrado; Microbial activity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300363

Water-retaining polymer and seedling type when planting irrigated coffee
Provedor de dados: 124
Autores: Souza,Antonio Jackson Jesus; Guimarães,Rubens José; Dominghetti,Anderson William; Scalco,Myriane Stella; Rezende,Tiago Teruel.
ABSTRACT The aim of this work was to evaluate the use of a water-retaining polymer on the initial growth of coffee plants for different levels of irrigation and types of seedling. The experiment was set up in pots with a clayey soil, in a greenhouse of the Sector for Coffee Production of the Federal University of Lavras, Brazil. The experiment was arranged in a randomised block design into sub-lots with three replications, giving a total of 48 experimental units. Four levels of irrigation (25%, 50%, 75% and 100% of the available water) were randomly assigned to the lots; the type of seedling (grown in bags or tubes) were randomly assigned to the sub-lots, and the use or not of the water-retaining polymer randomly assigned to the sub-sub-lots. In the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seedling containers; Implementation; Coffea arabica L.; Hydrogel.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200334

Modeling drying of seed maize using super absorbent hydrogel under hermetic conditions
Provedor de dados: 111
Autores: Kiburi, Florence Gatwiri; Kanali, |Christopher; Mbuge, Duncan Onyango.
The objective of this study was to establish the feasibility of applying the Page, Two term exponential, Newton, Logarithmic and Henderson and Pabis mathematical drying models for predicting the drying kinetics of seed maize using super absorbent hydrogel under hermetic conditions. To achieve this, the study was conducted using hydrogel to seed maize ratios by weight of 0:1, 1:5, 1:10 and 1:15 at four different drying temperature levels of 25oC, 30oC, 35oC and 40oC at different initial seed maize moisture contents of 16%, 28% and 53% (dry basis). The moisture data obtained were fitted into the five drying models using non-linear regression analysis (MS Excel 2003TM) based on the minimization of sum of squares by adjusting the model constants. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drying model; Seed maize; Hydrogel; Logarithmic model.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3317

Effect of drying method on mechanical, thermal and water absorption properties of enzymatically crosslinked gelatin hydrogels
Provedor de dados: 42
Autores: SIMONI,RAYSSA C.; LEMES,GISLAINE F.; FIALHO,SANDRA; GONÇALVES,ODINEI H.; GOZZO,ANGELA M.; CHIARADIA,VIVIANE; SAYER,CLAUDIA; SHIRAI,MARIANNE A.; LEIMANN,FERNANDA V.
ABSTRACT Enzymatically crossliked gelatin hydrogel was submitted to two different drying methods: air drying and freeze drying. The resulting polymeric tridimensional arrangement (compact or porous, respectively) led to different thermal and swelling properties. Significant differences (p &lt; 0.05) on thermal and mechanical characteristics as well as swelling in non-enzymatic gastric and intestinal simulated fluids (37 ºC) were detected. Water absorption data in such media was modelled according to Higuchi, Korsmeyer-Peppas, and Peppas-Sahlin equations. Freeze dried hydrogel showed Fickian diffusion behavior while air dried hydrogels presented poor adjustment to Higuchi model suggesting the importance of the relaxation mechanism at the beginning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air drying; Freeze drying; Hydrogel; Transglutaminase.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200745

Effect of polymers associated with N and K fertilizer sources on Dendrathema grandiflorum growth and K, Ca and Mg relations
Provedor de dados: 52
Autores: Regiane Cristina Marcato,Sita; Reissmann,Carlos Bruno; Marques,Renato; Oliveira,Edilson de; Taffarel,Angela Daniela.
This study was conducted to evaluate the effect of polymer used with different nitrogen and potassium sources on the growth and nutrition of chrysanthemum (Dendranthema grandiforum, var. "Virginal") and on chemical characteristics of substrate. Two substrates were evaluated: 1) composite with 50 % organic soil, 45 % sand, and 5 % composted tobacco; 2) plow layer soil (0-20 cm depth; red oxisol typical dystrophic). The experimental design was a factorial (4x2x2) and included four polymer rates (0, 1, 2, and 4 g kg-1of substrate), two nitrogen ((NH4)2SO4 and (H2N)2CO), and two potassium (KCl and K2SO4) sources. Dry biomass, flower number, and concentration of K, Ca, and Mg were evaluated. Inverse relationships between polymer rates and plant biomass,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrogel; Polyacrylamide; Chrysanthemum; Fertilizer; Macronutrients.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000300002

Biomechanical and histological evaluation of hydrogel implants in articular cartilage
Provedor de dados: 56
Autores: Malmonge,S.M.; Zavaglia,C.A.C.; Belangero,W.D.
We evaluated the mechanical behavior of the repaired surfaces of defective articular cartilage in the intercondylar region of the rat femur after a hydrogel graft implant. The results were compared to those for the adjacent normal articular cartilage and for control surfaces where the defects remained empty. Hydrogel synthesized by blending poly(2-hydroxyethyl methacrylate) and poly(methyl methacrylate-co-acrylic acid) was implanted in male Wistar rats. The animals were divided into five groups with postoperative follow-up periods of 3, 5, 8, 12 and 16 weeks. Indentation tests were performed on the neoformed surfaces in the knee joint (with or without a hydrogel implant) and on adjacent articular cartilage in order to assess the mechanical properties of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomaterial; Cartilage repair; Hydrogel; Biomechanical evaluation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000300008

Manipulation of a quasi-natural cell block for high-efficiency transplantation of adherent somatic cells
Provedor de dados: 56
Autores: Chung,H.J.; Hassan,M.M.; Park,J.O.; Kim,H.J.; Hong,S.T.
Recent advances have raised hope that transplantation of adherent somatic cells could provide dramatic new therapies for various diseases. However, current methods for transplanting adherent somatic cells are not efficient enough for therapeutic applications. Here, we report the development of a novel method to generate quasi-natural cell blocks for high-efficiency transplantation of adherent somatic cells. The blocks were created by providing a unique environment in which cultured cells generated their own extracellular matrix. Initially, stromal cells isolated from mice were expanded in vitro in liquid cell culture medium followed by transferring the cells into a hydrogel shell. After incubation for 1 day with mechanical agitation, the encapsulated cell...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quasi-natural cell block; Transplantation; Scaffold; Extracellular matrix; Hydrogel.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000500392

Effects of nanoparticles of hydroxy-aluminum phthalocyanine on markers of liver injury and glucose metabolism in diabetic mice
Provedor de dados: 56
Autores: Melo,M.A.B.; Caetano,W.; Oliveira,E.L.; Barbosa,P.M.; Rando,A.L.B.; Pedrosa,M.M.D.; Godoi,V.A.F.
Photodynamic therapy, by reducing pain and inflammation and promoting the proliferation of healthy cells, can be used to treat recurrent lesions, such as diabetic foot ulcers. Studies using the photosensitizer phthalocyanine, together with the nanostructured copolymeric matrix of Pluronic® and Carbopol® for the treatment of diabetic foot ulcers and leishmaniosis lesions, are showing promising outcomes. Despite their topical or subcutaneous administration, these molecules are absorbed and their systemic effects are unknown. Therefore, we investigated the effect of the subcutaneous administration of the hydroxy-aluminum phthalocyanine hydrogel without illumination on systemic parameters, markers of liver injury, and liver energy metabolism in type 1 diabetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydroxy-aluminum phthalocyanine; Hydrogel; Liver; Type 1 diabetes; Mice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000100609