Karla Guerra - Academia.edu (original) (raw)

Papers by Karla Guerra

Abstract

Annals of Hematology, 1992

MELÃO MINIMAMENTE PROCESSADO: UM CONTROLE DE qUALIDADE 1

... Karla Suzanne Florentino da Silva Chaves Damasceno I, * ; Marta Assunção Alves II ; Silvana C... more ... Karla Suzanne Florentino da Silva Chaves Damasceno I, * ; Marta Assunção Alves II ; Silvana Correia de Mendonça III ; Nonete Barbosa Guerra IV ; Tânia Lúcia Montenegro Stamford V. ... Endereço: Rua Gregório de Matos, 359, Nova Parnamirim, Parnamirim, RN, Brasil. ...

International Journal of Morphology, 2009

Due to its prominent role in major excretory pathways, the kidney is particularly sensitive espec... more Due to its prominent role in major excretory pathways, the kidney is particularly sensitive especially to toxicity for antimicrobials drugs. Storage of these drugs in the renal cortex, their effect on renal cells, have consequences on the renal function, and then reabsorbed by renal tubules induce nephrotixicity. Our objective was to show the renal morphopatological alterations induced by gentamicin through the histochemical methods of routine periodic acid de Schiff (PAS) staining and imunohistochemical staining for the expression of the protein P53, which is considered as a marker for cellular apoptosis. This allows the early detection of tubular lesions. The renal morphopathologic findings were cell apoptosis, basal membrane interruption, mesangial proliferation cells, decreased Bowman's space. This result clearly shows that gentamicin administration induces renal morphopatological alterations. KEY WORDS: Nephrotoxicity; Aminoglycosides; Expression of the P53 protein; Renal morphopatological alterations. DE SOUZA, V. B.; OLIVEIRA, R. F.; LUCENA, H. F.; FERREIRA, A. A. A.; GUERRA, G. C. B.; FREITAS, M. L.; QUEIROZ, K. C. S. & DE ARAÚJO JÚNIOR, R. F. Gentamicina induce morfopatología renal en ratas Wistar. Int. J. Morphol., 27(1):59-63, 2009.

Variabilidade intra-individual do controle glicêmico em pacientes com diabetes tipo 1

Arquivos Brasileiros De Endocrinologia E Metabologia, 2003

AIM: to evaluate the variability of glycemic control in type 1 diabetes (DM1) patients under rout... more AIM: to evaluate the variability of glycemic control in type 1 diabetes (DM1) patients under routine clinical care. PATIENTS AND METHODS: 100 patients (55 female), mean age of 18.6±9 years, age at diagnosis 12 (1-35) years and DM duration of 5 years (0.09-40), with a follow-up period of 4.3 (2-8.5) years. Glycated hemoglobin (HbA1c) was determined by HPLC (reference values: 2.4-6.2%). RESULTS: Data from 94 patients were analyzed. Baseline and final HbA1c were 7.6±1.8% and 8.7±2.1%, with an absolute increase of 1.1% (-7; 7.2) and an annual increase of 0.22% (-3.5; 3.6). On follow-up 6 (3-10) HbA1c were measured per patient. A significant difference in the number of HbA1c determinations was seen in the group whose glycemic control worsened (7.2±2.1) as compared to that whose glycemic control remained regular or bad (4.7±1) (p=0.003). HbA1c levels remained unchanged in 2 (2.1%), increased in 64 (68.1%) and decreased in 28 (29.8%) patients. 48 of the 94 patients (51.1%) worsened, 12 (12.8%) improved, 21 (22.3%) maintained good or excellent control and 13 (13.8%) remained with regular or bad control. The intra-individual difference between the highest and the lowest HbA1c during the study was 3.1% (0.3-9.5). The coefficient of variability and the SD of the HbA1c was 15.5±8.1% and 1.2±0.7%, respectively, and was lower in patients who remained with good or excellent control. The correlation between the final and initial HbA1c was r= 0.37 (p=0.000) and between the mean and initial HbA1c was r= 0.71 (p=0.000). CONCLUSION: The majority of our patients worsened the glycemic control during the follow-up. There was also a great intra-individual variability of the glycemic control. Baseline HbA1c has shown to be an important predictor of the glycemic control.

The heterochromatin banding patterns in the karyotypes of 17 species belonging to 15 genera of Ru... more The heterochromatin banding patterns in the karyotypes of 17 species belonging to 15 genera of Rutaceae subfamily Aurantioideae (ϭ Citroideae) were analyzed with the fluorochromes chromomycin (CMA) and 4Ј-6-diamidino-2-phenylindole-2HCl (DAPI). All species were diploids, except one tetraploid (Clausena excavata) and two hexaploids [Glycosmis parviflora agg. (aggregate) and G. pentaphylla agg.]. There are only CMA ϩ /DAPI Ϫ bands, including those associated with the nucleolus. Using recent cpDNA (chloroplast DNA) sequence data as a phylogenetic background, it becomes evident that generally more basal genera with rather plesiomorphic traits in their morphology, anatomy, and phytochemistry exhibit very small amounts of heterochromatin (e.g., Glycosmis, Severinia, Swinglea), whereas relatively advanced genera from different clades with more apomorphic characters display numerous large CMA ϩ bands (e.g., Merrillia, Feroniella, Fortunella). Heterochromatin increase (from 0.7 to 13.7%) is interpreted as apomorphic. The bands are mostly located in the larger chromosomes and at telomeric regions of larger arms. However, one of the largest chromosome pair has been conserved throughout the subfamily with only very little heterochromatin. The heterochromatin-rich patterns observed in different clades of Aurantioideae appear quite similar, suggesting a kind of parallel chromosomal evolution. In respect to the current classification of the subfamily, it is proposed to divide Murraya s.l. (sensu lato) into Bergera and Murraya s.s. (sensu stricto) and to place the former near Clausena into Clauseneae s.s. and the latter together with Merrillia into Citreae s.l. The subtribes recognized within Clauseneae s.s. and Citreae s.l. appear heterogeneous and should be abandoned. On the other hand, the monophyletic nature of the core group of Citrinae, i.e., the Citrus clade with Eremocitrus, Microcitrus, Clymenia, Poncirus, Fortunella, and Citrus, is well supported.

American Journal of Botany, 2000

Nutritional Neuroscience, 2009

Ketogenic diets influence brain function and have been therapeutically used for anti-epileptic pu... more Ketogenic diets influence brain function and have been therapeutically used for anti-epileptic purposes. We investigated the effects of maternal ketogenic diets on the development of somatic and reflex responses in rat pups. These were born from mothers receiving: (i) normal fat (7%) + normal protein (17%); (ii) high-fat (55.4%) + normal protein; (iii) normal fat + low protein (8%); and (iv) high-fat + low protein (respectively, called N-17, K-17, N-8 and K-8). Ketogenic diets, but not the normal-fat diets, delayed the development of reflex and somatic responses. The effects were more evident when the ketogenic diet was associated with low protein content. The results suggest that fat excess can alter brain maturation, and this action is intensified by early protein-deficiency. Data raise concerns about the therapeutic use of ketogenic diets in newborn children.

Revista Brasileira De Ciencia Do Solo, 2008

Este estudo foi realizado na área experimental da Faculdade de Agronomia da FESURV - Universidade... more Este estudo foi realizado na área experimental da Faculdade de Agronomia da FESURV - Universidade de Rio Verde, no sudoeste de Goiás, em um Latossolo Vermelho distroférrico textura argilosa, no período de outubro de 2004 a maio de 2005. Seu objetivo foi avaliar a liberação de nutrientes na palhada de milheto (Pennisetum glaucum), cultivar ADR300, em diferentes estádios fenológicos (pré-emborrachamento, pré-florescimento e início do florescimento). Utilizou-se essa cultura como cobertura de solo para o sistema plantio direto, em parcelas com área total de 9 m2. O delineamento experimental utilizado foi o de blocos casualizados, com parcelas subdivididas no tempo, com quatro repetições. Para avaliar a liberação de nutrientes, foi utilizado o método de bolsas de decomposição. Após o manejo do milheto, as avaliações de decomposição da palhada foram realizadas em intervalos de 30 dias, até 150 dias após o manejo. O maior acúmulo de nutrientes foi no estádio fenológico de início do florescimento. A dinâmica da liberação de nutrientes foi diferente em todos os estádios fenológicos com exceção para o K; este foi o nutriente mais facilmente liberado, independentemente do estádio fenológico.

Melão minimamente processado: um controle de qualidade

Ciencia E Tecnologia De Alimentos, 2005

O processamento mínimo tem sido descrito como a manipulação, preparo, embalagem e distribuição de... more O processamento mínimo tem sido descrito como a manipulação, preparo, embalagem e distribuição de produtos agrícolas, através de procedimentos como a seleção, limpeza, lavagem, descascamento e corte, que não afetem as suas características organolépticas e agreguem valor aos mesmos, resultando em produtos naturais, práticos, cujo preparo e consumo requerem menos tempo, atendendo às exigências da vida moderna. A finalidade dos alimentos minimamente processados e refrigerados é proporcionar ao consumidor um produto similar ao fresco, garantindo segurança e mantendo a qualidade nutritiva e sensorial. O processo tem despertado interesse para a realização de pesquisas, principalmente, relacionando as alterações microbiológicas, físico-químicas e sensoriais que influenciam a vida de prateleira destes produtos. O objetivo do trabalho foi a avaliação do efeito da temperatura de comercialização (15ºC) sobre a qualidade físico-química, microbiológica e sensorial do melão espanhol (Cucumis melo L. var. inodorus) minimamente processado. Os frutos acondicionados em bandejas e envolvidos com filme plástico foram adquiridos aleatoriamente em um supermercado local. Os tratamentos foram: temperaturas (4 e 15ºC), períodos de armazenamento (5, 10, 15 e 1, 2 e 3 dias a 4ºC e 15ºC, respectivamente) e o tratamento controle (melão minimamente processado no dia zero). As amostras foram analisadas quanto às características físico-químicas, microbiológicas e sensoriais. A qualidade do melão foi afetada, significativamente, durante o armazenamento refrigerado. Na temperatura de comercialização (15ºC) o produto apresenta prazo de validade de apenas 24 horas. O armazenamento a 4°C permitiu uma conservação de até 5 dias, sendo necessária a discriminação da temperatura e do período de armazenamento adequado, no rótulo do produto.

Chromosome Research, 2010

Most species of Citrus and related genera display a similar karyotype with 2n = 18 and a variable... more Most species of Citrus and related genera display a similar karyotype with 2n = 18 and a variable number of terminal heterochromatic blocks positively stained with chromomycin A3 (CMA+ bands). Some of these blocks are 45S rDNA sites, whereas others may correspond to the main GC-rich satellite DNA found in several Citrus species. In the present work, the distribution of the 45S rDNA and the main satellite DNA isolated from C. sinensis (CsSat) were investigated by in situ hybridization in seven species of Citrus, two species of closely related genera (Fortunella obovata and Poncirus trifoliata) and four species of the subfamily Aurantioideae, which were less related to Citrus (Atalantia monophylla, Murraya paniculata, Severinia buxifolia, and Triphasia trifolia). In Citrus, Fortunella, and Poncirus, most CMA+ bands colocalized only with CsSat sites, whereas others colocalized only with rDNA sites. However, some of these species displayed a few CMA+ bands that colocalized with sites of both probes and other CMA+ bands that did not colocalized with any of the probes. On the other hand, in the four species less related to Citrus, no CsSat signal was found on chromosomes. On Southern blot, the CsSat probe hybridized with genomic DNA from Citrus, Fortunella, and Poncirus at high stringency only, while under the less stringent conditions, it also hybridized with distantly related species. Therefore, CsSat sequences are the principal component of the heterochromatic blocks of Citrus, Poncirus, and Fortunella, whereas CsSat-like sequences seem to be widespread in the subfamily Aurantioideae. These data further suggest that the variable number of terminal CMA+ bands observed on chromosomes of Citrus and related genera are probably the consequence of amplification or reduction in the number of CsSat-like sequences distributed on chromosome termini, paralleled by mutation and homogenization events, as proposed by the library hypothesis.