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The effect of the land use on phytoplankton assemblages of a Cerrado stream (Brazil)
Ferrareze, Mateus;
Acta Limnologica Brasiliensia , 2012, DOI: 10.1590/S2179-975X2012005000025
Abstract: aim: our aim was to investigate whether land use from the adjacent terrestrial environment influences phytoplankton assemblage structure (composition, richness, diversity, and abundance) and biomass (chlorophyll-a) in a cerrado stream during different periods of the year. method: the fieldwork was carried out at each 3 months during two years. results: the physical and chemical variables that better indicated differences in water condition were conductivity, dissolved oxygen, and transparency. there was also a noticeable increase in the concentration of nitrogen, phosphorus, and suspended matter in the water during summer due to the direct effects of rainfall. the phytoplankton assemblages were composed by 64 species. cryptophyceae was the most abundant group, followed by bacillariophyceae. for both years, richness and diversity were higher during spring and autumn, while phytoplankton abundance and chlorophyll-a concentration were greater during autumn and summer. the cluster and the canonic correspondence analyses evidenced that seasonality and land use are important factors in structuring phytoplankton communities along the year. alterations in phytoplankton assemblages registered herein were probably a consequence of variations on intensity and frequency of water mixing, along with the input of nutrients from the adjacent terrestrial system. conclusion: overall phytoplankton assemblage structure showed to be highly influenced by land use, corroborating our initial hypothesis.
The effect of the land use on phytoplankton assemblages of a Cerrado stream (Brazil) Os efeitos do uso do solo sobre as assembleias fitoplanct nicas de um riacho de Cerrado (Brasil)
Mateus Ferrareze
Acta Limnologica Brasiliensia , 2012,
Abstract: AIM: Our aim was to investigate whether land use from the adjacent terrestrial environment influences phytoplankton assemblage structure (composition, richness, diversity, and abundance) and biomass (chlorophyll-a) in a Cerrado stream during different periods of the year. METHOD: The fieldwork was carried out at each 3 months during two years. RESULTS: The physical and chemical variables that better indicated differences in water condition were conductivity, dissolved oxygen, and transparency. There was also a noticeable increase in the concentration of nitrogen, phosphorus, and suspended matter in the water during summer due to the direct effects of rainfall. The phytoplankton assemblages were composed by 64 species. Cryptophyceae was the most abundant group, followed by Bacillariophyceae. For both years, richness and diversity were higher during spring and autumn, while phytoplankton abundance and chlorophyll-a concentration were greater during autumn and summer. The cluster and the canonic correspondence analyses evidenced that seasonality and land use are important factors in structuring phytoplankton communities along the year. Alterations in phytoplankton assemblages registered herein were probably a consequence of variations on intensity and frequency of water mixing, along with the input of nutrients from the adjacent terrestrial system. CONCLUSION: Overall phytoplankton assemblage structure showed to be highly influenced by land use, corroborating our initial hypothesis. OBJETIVO: Nosso objetivo foi investigar se o uso do solo do ambiente terrestre adjacente influencia a estrutura das assembleias fitoplanct nicas (composi o, riqueza, diversidade e abundancia) e biomassa (clorofila-a) em um riacho de Cerrado durante diferentes períodos do ano. MéTODOS: Os trabalhos de campo foram realizados trimestralmente durante dois anos. RESULTADOS: As variáveis físico-químicas que melhor indicaram as diferen as nas condi es da água foram condutividade, oxigênio dissolvido e transparência. Também houve um notável aumento na concentra o de nitrogênio, fósforo e material em suspens o na água durante o ver o devido aos efeitos da pluviosidade. As assembleias fitoplanct nicas foram compostas por 64 espécies. Cryptophyceae foi o grupo mais abundante, seguido por Bacillariophyceae. Para ambos os anos, a riqueza e a diversidade foram maiores durante a primavera e no outono, enquanto que a abundancia do fitoplancton e a concentra o de clorofila-a foram mais elevados durante o outono e ver o. A análise de agrupamento e a analise de correspondência can nica mostra
Importance of lateral lagoons for the ichthyofauna in a large tropical reservoir
Ferrareze, M.;Nogueira, MG.;
Brazilian Journal of Biology , 2011, DOI: 10.1590/S1519-69842011000500002
Abstract: this study aimed to analyse the composition and the ecological attributes of small-sized fish assemblages in four lagoons and in the main channel of rosana reservoir (se brazil). fieldwork was carried out in september and november/2004 and january, march, may and august/2005. in each sampling station and period five manual throws were performed towards aquatic macrophyte stands, using a hand net (1.5 × 5 m; 0.3 cm of mesh size). the ichthyofauna collected was represented by 42 species, totalizing 3,424 individuals, 2,186 g in weight. the order characiformes was dominant, mainly in the lagoons with low connectivity with the river. the main taxon (importance index) was hemigrammus marginatus. higher richness, abundance, biomass, diversity and lower individual mean length were observed in the lagoons, especially during the rainy period. spatial segregation of some species was showed by the canonical correspondence analysis indicating the habitat complexity. the results validate the hypotheses that lateral lagoons have a prominent ecological role in the life cycle of juveniles and small fish and demonstrate how the connectivity river/lagoons may be important for assemblages maintenance.
Phytoplankton assemblages in a reservoir cascade of a large tropical - subtropical river (SE, Brazil)
Nogueira, MG;Ferrareze, M;Moreira, ML;Gouvêa, RM;
Brazilian Journal of Biology , 2010, DOI: 10.1590/S1519-69842010000400009
Abstract: the phytoplankton assemblages from eight reservoirs of the paranapanema river were studied during two consecutive years. chlorophyceae and bacillaryophyceae dominated in richness. the observed high number of taxa, 234, reflects the extensive sampling programme and evidences the necessity of considering the whole hydrograph basin to assess the biodiversity status of inland water ecosystems. the dams had a negative effect on phytoplankton richness, with higher number of taxa associate to riverine (non-regulated) stretches. the tributary rivers also exhibited high species richness, showing the importance of considering the lateral dimension, in addition to the longitudinal one, for aquatic biota inventories in large river basins/reservoirs. richness and diversity were also positively influenced by the connectivity with lateral wetlands (macrophyte-dominated lakes) due to the periphyton influence. the phytoplankton abundance/biomass was not influenced by higher water retention time. higher values occurred in the middle basin stretches (river-passage reservoirs) due to the increase in the trophic conditions. there was a positive correlation with phosphorus. poorer light conditions in the cascade do not limit the phytoplankton biomass, with assemblages dominated by species tolerant to turbulent conditions and high mineral turbidity. bacillariophyceae and cryptophyceae dominated numerically. the first group (unicellular forms) was prominent in the large and oligotrophic upstream reservoirs. the second was highly abundant in the river-passage (low retention time), and more eutrophic, reservoirs. cyanophyceae growth is probably controlled by advection processes (wash-out effect). the zooplankton does not control the phytoplankton biomass and the diversity of both groups is positively associated in the cascade. the structure of the phytoplankton assemblages showed to be a good indicator of the operationally distinct reservoirs of the paranapanema cascade and also reflected th
Percep??o do estresse entre enfermeiros que atuam em Terapia Intensiva
Ferrareze, Maria Ver?nica Guilherme;Ferreira, Viviane;Carvalho, Ana Maria Pimenta;
Acta Paulista de Enfermagem , 2006, DOI: 10.1590/S0103-21002006000300009
Abstract: objective: to examine the perception of stress among critical care nurses in critical from a brazilian university hospital. methods: a demographic questionnaire was used to gather the sample characteristics data. perception and level of stress was measured with a known stress inventory. results: the sample consisted of 12 nurses. the majority of the sample was women (91.7%) women; working 10 to 12 hours per day (75%), and less than a half of them (33.4%) had 5 to 10 years of higher education. more than a half of the sample (66.7%) had signs of physical and/or psychological suffering, which are characteristic of the stress resistance phase. conclusion: these findings suggest that critical care nurses may need the special attention to prevent the development of stress and its complications.
Controle de infec??o relacionada a cateter venoso central impregnado com antissépticos: revis?o integrativa
Ferreira, Maria Ver?nica Ferrareze;Andrade, Denise de;Ferreira, Adriano Menis;
Revista da Escola de Enfermagem da USP , 2011, DOI: 10.1590/S0080-62342011000400030
Abstract: the use of central venous catheter is pointed out as a risk factor to blood stream infection. the objective of this study was to reach scientific evidence on infection control related to central venous catheter impregnated with antiseptics, used in hospitalized adult patients. studies were selected from the lilacs, cinahl and medline databases. nine articles were selected by means of integrative literature review. the publications on the use of catheters impregnated with antiseptics showed statistically significant differences regarding the reduction of microbial colonization; however, only one study showed reduction in the occurrence of infection. the analysis of the studies revealed there is a need for further research in different patient populations in order to obtain general conclusions.
Condition of cleanliness of surfaces close to patients in an intensive care unit
Ferreira, Adriano Menis;Andrade, Denise de;Rigotti, Marcelo Alessandro;Ferreira, Maria Ver?nica Ferrareze;
Revista Latino-Americana de Enfermagem , 2011, DOI: 10.1590/S0104-11692011000300015
Abstract: surface cleaning is a well-known control procedure against the dissemination of microorganisms in the hospital environment. this prospective study, carried out in an intensive care unit over the course of 14 days, describes the cleaning/disinfection conditions of four surfaces near patients. in total, 100 assessments of the surfaces were carried out after they were cleaned. three methods were used to evaluate cleanliness: a visual inspection, an adenosine triphosphate (atp) bioluminescence assay and testing for the presence of staphylococcus aureus and meticillin-resistant staphylococcus aureus/mrsa. respectively, 20%, 80% and 16% of the assessments by the visual method, atp and the presence of staphylococcus aureus/mrsa failed. there were statistically significant differences (p<0.05) between the rates of failure of the cleaning using the atp method, compared to the visual and microbiological methods. the visual inspection was not a reliable measure to evaluate surface cleanliness. the results demonstrated that the adopted cleaning routine should be reconsidered.
Pseudomonas aeruginosa multiresistente em unidade de cuidados intensivos: desafios que procedem?
Ferrareze, Maria Ver?nica Guilherme;Leopoldo, Vanessa Cristina;Andrade, Denise;Silva, Magda Fabbri Issac;Haas, Vanderlei José;
Acta Paulista de Enfermagem , 2007, DOI: 10.1590/S0103-21002007000100002
Abstract: objectives: to evaluate the occurrence of multi-resistant pseudomonas aeruginosa infection among patients from an intensive care unit. methods: this retrospective study was conducted in an emergency hospital. data were collected from october 2003 to september 2004. results: sixty-eight patients were infected with multi-resistant bacteria. ten of these patients (14.7%) were infected with pseudomonas aeruginosa. among these with pseudomonas aeruginosa, 8 patients were male and they had a mean age of 57 years and a mean of hospitalization of 43.7 days. strains of pseudomonas aeruginosa were isolated in blood (n =8), in urine (n = 5), in venous catheter port (n = 2), and in cerebrospinal fluid (n =1). seven of these strains were sensitive to polymyxin b and 3 strains were sensitive to imipenem. conclusions: since patients' microbiological profile is specific to a unit or institution, it should be assessed periodically and addressed with specific interventions.
Coordena??o global, equilíbrio, índice de massa corporal e nível de atividade física: um estudo correlacional em idosos de Ivoti, RS, Brasil
Piccoli, Jo?o Carlos Jaccottet;Quevedo, Daniela Muller de;Santos, Geraldine Alves dos;Ferrareze, Matheus Elias;Gluher, Adriana;
Revista Brasileira de Geriatria e Gerontologia , 2012, DOI: 10.1590/S1809-98232012000200004
Abstract: objective: this study aimed to assess the relationship among body mass index (bmi), physical activity level, global coordination, and postural balance in an elderly population from ivoti, state of rio grande do sul, brazil. methods: this descriptive cross-sectional study assessed a convenience sample of 202 elderly female and male subjects. it was used the global coordination test and the postural balance test and calculated the bmi according to the cutoff points: malnutrition: < 22.0 kg/m2, normal weight: from 22.0 to 27.0 kg/m2, and obesity: > 27.0 kg/m2. the level of physical activity was classified in mets as: high active from 1,500 to 3,000 mets-min/week; moderate from 600 to 1499 mets-min/week and low below 600 mets-min/week. data was submitted to the descriptive statistical and the spearman correlation (α = 0.05) using the spss software, version 16.0. the study was approved by the ethics research committee of universidade feevale, novo hamburgo, rs, brazil. results: among the 202 individuals, 62 (30.7%) were males and 140 (69.3%), females. the male and female age averages were 69.53 ± 6.23 and 67.52 ± 5.69 years old, respectively. the general sample age average was 68.14 ± 5.92 years. negative correlation between bmi and global coordination and bmi and balance was detected, r = -0.423 (p < 0.01) and r = -0.3060 (p < 0.01), respectively. however, when stratified by sex, these associations were not significant for males. the physical activity level showed negative correlation when compared with bmi (r= -0,219) and with age (r= -0,241), it had a positive correlation when compared with global coordination (r= 0,274) and balance (r=0,191). when compared bmi and balance and age and balance no correlation was found in the elderly subjects classified as sufficiently active. global coordination and balance were positively correlated to the level of physical activity only in female subjects. however, bmi is negatively correlated to the level of physical activity of bot
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