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The distribution of seagrasses in Dominica, Lesser Antilles
Steiner,S.C.C; Macfarlane,K.J; Price,L.M; Willette,D.A;
Revista de Biología Tropical , 2010,
Abstract: seagrass beds are the largest organism-built marine habitat in dominica, yet have only been surveyed since 2007. standardized examinations along a depth gradient between 0 and 24m, focusing on magnoliophyte species composition and benthic cover of shoots at 17 seagrass bed sites, were carried out between september 10 and december 7, 2008. the cymodoceaceae syringodium filiforme (kuetzing 1860) and halodule wrightii (ascherson 1868), as well as the hydrocharitaceae halophila decipiens (ostenfeld 1902), h. stipulacea (fosskal & ascherson 1867) and thalassia testudinum (banks ex k?nig 1805) displayed distinct regional and horizontal distribution patterns. syringodium filiforme is the island’s dominant seagrass along the western and northern coasts, occurring at depths between 2 and 18m and with a mean benthic cover ranging from 0.9-10% along the west coast. along the north coast it grew between 0.2 and 1m depth with a mean maximum benthic cover of 48.9%. halodule wrightii grew along the north and west coasts, in depths between 1 and 14m in areas of recent and chronic disturbances. its delicate morphology and sparse benthic cover (<0.1%) did not constitute seagrass beds. halophila decipiens grew along the deep, shallow and lateral margins of west coast s. filiforme beds and monospecifically in depths between 3 and 24m. halophila stipulacea, an invasive species, was widespread along 45km of the west coast and was found in depths between 5 and 24m. both halophila species formed extensive beds at depths beyond the survey limit of 24m thus playing a potentially important role in the resettlement of shallow areas after storms. h. decipiens and h. stipulacea are currently the second and third most common seagrasses on the island respectively, despite their absence along the north coast. t. testudinum was confined to north coast’s sheltered reef flats at depths 1m or less with mean a benthic cover ranging from 2 to 76%. it grew monospecifically in the most turbulent and in the
The distribution of seagrasses in Dominica, Lesser Antilles
S.C.C Steiner,K.J Macfarlane,L.M Price,D.A Willette
Revista de Biología Tropical , 2010,
Abstract: Seagrass beds are the largest organism-built marine habitat in Dominica, yet have only been surveyed since 2007. Standardized examinations along a depth gradient between 0 and 24m, focusing on magnoliophyte species composition and benthic cover of shoots at 17 seagrass bed sites, were carried out between September 10 and December 7, 2008. The Cymodoceaceae Syringodium filiforme (Kuetzing 1860) and Halodule wrightii (Ascherson 1868), as well as the Hydrocharitaceae Halophila decipiens (Ostenfeld 1902), H. stipulacea (Fosskal & Ascherson 1867) and Thalassia testudinum (Banks ex K nig 1805) displayed distinct regional and horizontal distribution patterns. Syringodium filiforme is the island’s dominant seagrass along the western and northern coasts, occurring at depths between 2 and 18m and with a mean benthic cover ranging from 0.9-10% along the West coast. Along the North coast it grew between 0.2 and 1m depth with a mean maximum benthic cover of 48.9%. Halodule wrightii grew along the North and West coasts, in depths between 1 and 14m in areas of recent and chronic disturbances. Its delicate morphology and sparse benthic cover (<0.1%) did not constitute seagrass beds. Halophila decipiens grew along the deep, shallow and lateral margins of west coast S. filiforme beds and monospecifically in depths between 3 and 24m. Halophila stipulacea, an invasive species, was widespread along 45km of the West coast and was found in depths between 5 and 24m. Both Halophila species formed extensive beds at depths beyond the survey limit of 24m thus playing a potentially important role in the resettlement of shallow areas after storms. H. decipiens and H. stipulacea are currently the second and third most common seagrasses on the island respectively, despite their absence along the North coast. T. testudinum was confined to North coast’s sheltered reef flats at depths 1m or less with mean a benthic cover ranging from 2 to 76%. It grew monospecifically in the most turbulent and in the calmest locations, yet intermixed with S. filiforme in areas of moderate turbulence. Strong surge along the West coast (October 15-16, 2008), associated with Hurricane Omar, caused uprooting and burial of seagrass beds in varying degrees, in particular along the shallow margins between 2 and 10m depth. This event also demonstrated the dynamic nature of Dominica’s shallow seagrass bed margins and the resistance level of individual beds to storm disturbances. Rev. Biol. Trop. 58 (Suppl. 3): 89-98. Epub 2010 October 01. Pastos marinos son los ambientes más grandes constituidos por organismos en
Influência do tempo do processo de curtimento na qualidade dos couros de coelhos (O. Cunniculus)
Franco,M.L.R.S.; Prado,M.; Domingues,M.C.; Gasparino,E.; Scapinello,C.; Silva,S.C.C.;
Archivos de Zootecnia , 2012, DOI: 10.4321/S0004-05922012000300011
Abstract: this experiment was carried out to evaluate the quality of the rabbit skins in different parts and orientations of the surface, submitted at different time of processing. the rabbits were slaughtered with 70 days of age and forty skins were used. it was used a completely randomized design in a 2 x 4 factorial treatment, being in two times of processing (t1= regular time and t2= continuous time) and four positions of cut in the skin (p1= fore longitudinal and p2= fore transversal; p3= hind longitudinal and p4= hind transversal). the steps of the tanning process were soaking, fleshing, liming (3% of sodium sulphide and 4% of lime), alkaline products remotion, purge, degrease, pickling, tanning (6% of chrome salts), neutralization, retanning (4% of chrome salts), dying, grease (6% of sulfacant oils), dryness and softening. the thickness of the rabbit skins was significantly higher (p<0.05) when the continuous time technique was used (1.03 mm). the time of tanning gave different values of traction in all positions of the samples, except for the fore transversal. the hind region regardless of the time showed a less resistant skin to traction (regular time= 6.01 n/mm2 and continuous time= 3.54 n/ mm2). the fore region regardless if it is a longitudinal way (37.28 n/mm) or transversal (35.71 n/mm), showed a higher resistance to tearing compared to the hind region (longitudinal= 26.78 n/mm and transversal= 25.94 n/mm) in regular time. the technique used in the regular time tanning offered a less elasticity to the rabbit skin in relation to the continuous time. the skins must be tanning by regular time because offer more resistance to traction and superior tearing than skins tanned by continuous time. the fore region showed more resistance than hind region for progressive tearing in all times of tanning. the skins of the hind longitudinal region regardless of the time showed a less resistant to traction. the regular time of tanning gave skins with less elasticity, but for pr
Controle químico de arroz-vermelho na cultura do arroz irrigado
Santos, F.M.;Marchesan, E.;Machado, S.L.O.;Villa, S.C.C.;Avila, L.A.;Massoni, P.F.S.;
Planta Daninha , 2007, DOI: 10.1590/S0100-83582007000200022
Abstract: red rice (oryza spp.) reduces rice (oryza sativa l.) grain yield and quality. a field study was conducted to compare two red rice control tools, the first using the clearfield? system and the second using high rates of clomazone and rice seeds treated with safener to suppress red rice emergence. the treatments included: check control without herbicide application, three treatments for the formulated herbicide mixture (imazethapyr 75 g i.a. l-1 + imazapic 25 g i.a. l-1) under the clearfield system, and three clomazone treatments (clomazone 500 g i.a. l-1). the most efficient treatment for red rice control was the formulated mixture of imazethapyr + imazapic (0.7 l ha-1 pre followed by 0.7 l ha-1 post). this treatment promoted 100% red rice control, without affecting plant stand and promoting high grain yield.
Arroz tolerante a imidazolinonas: banco de sementes de arroz-vermelho e fluxo gênico
Marchesan, E;Massoni, P.F.S;Grohs, M;Villa, S.C.C;Avila, L.A;Roso, R;
Planta Daninha , 2011, DOI: 10.1590/S0100-83582011000500017
Abstract: the objective of this study was to evaluate the rotation of the irrigated rice clear field? system with the conventional system in the evolution of the seed bank and the emergence of red rice biotypes resistant to the imidazolinone chemical group. the experiment was arranged in a randomized block design in a factorial scheme (2 x 4) with 4 replications. the first factor was constituted of the management systems used (clearfield?x conventional) which consisted of the succession/rotation between the rice not tolerant to imidazoline, variety irga 417 (conventional), and the rice tolerant to imidazolinone, variety irga 422 cl (clearfield?). the d factor was consti tuted by the variation between the conventional and the clearfield?systems, over time. the use of the clearfield?system provides a reduction of the seed bank after three years of use; however, it does not remove all the red rice seeds from the soil. the crossing between red rice and cultivated rice increases with the increase of infestation, reaching 2.9% after four crops.
Frequencia alélica e genotípica do gene DGAT1 em uma popula??o de bovinos de leite
Silva,S.C.C.; Vesco,A.P.; Luizzeti,F.; Gasparino,E.; Bagatoli,A.; Marques,L.A.; Voltolini,D.S.M.; Oliveria,D.P. de; Souza,K.R.S.;
Archivos de Zootecnia , 2011,
Abstract: dgat1 gene is a candidate gene involved in fat content in milk and. this study analyzed dna samples from 72 dairy cattle using blood samples. dna was extracted use ctab and proteinase k. the target region of the gene was amplified by pcr and the results were visualized with the use of polyacrylamide gel. the level of significance adopted was 5% for all analysis. four alleles were checked their frequencies were: a= 4.0%, b= 50%, c= 40%, and d= 6.0%. it was verified the hardy-weinberg using the chi square test concluding that the population was not in balance.
Controle de arroz-vermelho em dois genótipos de arroz (Oryza sativa) tolerantes a herbicidas do grupo das imidazolinonas
Villa, S.C.C.;Marchezan, E.;Massoni, P.F.S.;Santos, F.M.;Avila, L.A.;Machado, S.L.O.;Telo, G.M.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000300018
Abstract: red rice (oryza spp.) is one of the main limiting factors to rice (o. sativa) yield. an experiment was carried out to evaluate red rice control and the behavior of two rice genotypes tolerant to the imidazolinone herbicides in response to imazethapyr (75 g l-1 ) + imazapic (25 g l1 ) application rates and timing. the experiment was conducted in santa maria-rs, brazil in 2004/2005 and was arranged in a factorial scheme, in a randomized block design, with four replications. factor a included the two rice genotypes tolerant to the imidazolinones, a cultivar (irga 422 cl) and a hybrid (tuno cl); and factor d included the treatments for red rice control, which was a combination of rates and herbicide application timing. the hybrid was found to be more tolerant to the herbicide only than the cultivar. application rates up to 200% on the hybrid genotype could be done without affecting rice yield. it is important to state that increasing the rate of herbicide application can create carryover problems to non-tolerant crops. red rice control was total with split application of imazethapyr + imazapic in pre and post emergence with the total rate above 125%. the most efficient treatment was application of 75% in pre followed by 50% in post, which was the lowest rate promoting 100% control, with relatively low toxicity to the cultivar and without affecting rice yield.
Arroz tolerante a imidazolinonas: controle do arroz-vermelho, fluxo gênico e efeito residual do herbicida em culturas sucessoras n?o-tolerantes
Villa, S.C.C.;Marchezan, E.;Avila, L.A.;Massoni, P.F.S.;Telo, G.M.;Machado, S.L.O.;Camargo, E.R.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000400017
Abstract: after several decades searching for tools to control red rice, imidazolinone tolerant rice was developed to selectively control red rice. to better understand this technology an experiment was conducted in 2004/2005, in santa maria, rio grande do sul, brazil to evaluate: 1) red rice control by imidazolinone herbicides in clearfield? rice; 2) evaluate the imidazolinone herbicide carryover effect on rygrass and non-tolerant rice (irga 417) and 3) evaluate the outcrossing rates between clearfield rice and red rice. the experimental design was a randomized block design, with 3 treatments and 12 replications. to determine the outcrossing rates between clearfield rice and red rice, virtually all the red rice panicle was collected and analyzed in the area. the carryover effect was tested using ryegrass and a non-tolerant rice cultivar (irga 417). the herbicides tested controlled red rice. although injury to clearfield rice was observed, the herbicide did not affect yield. herbicide carry-over to non-tolerant rice was observed, reducing plant stand on rice seeded 361 days after herbicide application. natural out-crossing occurred between clearfield rice and red rice, at rates of 0.065%.
Compara??o do desempenho de pré-escolares, mediante teste de desenvolvimento de Denver, antes e após interven??o nutricional
Fisberg, M.;Pedrom?nico, M.R.;Braga, J.A.P.;Ferreira, A.M.A.;Pini, C.;Campos, S.C.C.;Lemes, S.O.;Silva, S.;Silva, R.S.;Andrade, T.M.;
Revista da Associa??o Médica Brasileira , 1997, DOI: 10.1590/S0104-42301997000200004
Abstract: psychomotor and development analysis must be emphasized when studying institutionalized children. many previous investigations have been showing deleterious effects of day care centers over developmental performance in children. objective. this study is aimed at comparing the performance in the development screening test (denver) in children attending day care centers, before and after nutritional intervention with an energetic supplement enriched with iron. method. 130 children from 2 to 6 years old, attending three municipal day care centers, were evaluated by means of the application of the denver test, by trained psychologists, comparing the collected data according to sex and age group, before and after six months intervention with iron enriched protein energetic supplement. results. most of the children had normal performance, both in first application (70.80%), and in the second one (80.80%). when comparing these results, 76.92% of the children had not altered their performance and 18.46% improved it substantially. as to sex, no significant differences were found and as to age group, there was significant improvement among children aged 4 to 6 years of age. conclusions. besides the nutritional aspects, factors such as learning readiness, family organization, and psychopedagogic orientation to the day care centers, must have fostered development, even if the low socioeconomic level of the studied population is considered.
Vegetable fibers as multifunctional materials
Amico, S.C.;
Matéria (Rio de Janeiro) , 2010, DOI: 10.1590/S1517-70762010000200037
Abstract: concerns related to the ever-growing use of raw-materials from non-renewable sources by modern society is driving the interest of the academic and scientific sectors for a new concept of material, which takes into account not only mechanical performance, cost and availability, but also environmentally-related issues, such as biodegradability, renewability and energy use, along with the promotion of social and economical development of the economically-challenged segment of the population. vegetable fibers have been used in many home-made objects, such as ropes and artcraft, for perhaps as long as humanity exists. however, these fibers present a combination of interesting properties which enables their use in a wide variety of sectors. this invited article will review the work recently carried out by the author in collaboration with various researchers from ufrgs, ufpr and ucs, and will be divided into three case studies, focusing on the use of vegetable fibers for oil sorption, as infiltration (flow) medium and as reinforcement for polymer composites, promoting their use in more demanding and rewarding applications.
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