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Search Results: 1 - 10 of 5610 matches for " Gentile Carla "
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Compara??o entre limiares de audibilidade e eletrofisiológico por estímulo tone burst
Pinto, Fernanda Rodrigues;Matas, Carla Gentile;
Revista Brasileira de Otorrinolaringologia , 2007, DOI: 10.1590/S0034-72992007000400010
Abstract: studies have reported compatibility between hearing and electrophysiological thresholds in the auditory brainstem response (abr) with tone burst stimuli. aims: to verify waves i, iii, v and their latency times for tone bursts at 500, 1000, 2000 and 4000 hz and at 80 db hl, and to compare tone burst electrophysiological thresholds with those obtained from audiological and psychoacoustic evaluations. methods: audiological, psychoacoustic and electrophysiological evaluations of 40 male and female normal hearing individuals aged between 18 and 40 years were undertaken. results: only wave v was visualized at 80 db hl and its latency values decreased with increased frequencies in both genders. at 1000, 2000 and 4000 hz male subjects presented higher electrophysiological thresholds values than females at all frequencies. at 500, 1000 and 2000 hz, electrophysiological, hearing, and psychoacoustic thresholds were statistically different in both genders. conclusion: although abr with tone burst stimulus is clinically applicable, further research is needed to standardize test techniques and results.
Potenciais evocados auditivos tardios em indivíduos com queixa de zumbido
Santos Filha, Valdete Alves Valentins dos;Matas, Carla Gentile;
Brazilian Journal of Otorhinolaryngology , 2010, DOI: 10.1590/S1808-86942010000200019
Abstract: long latency auditory evoked potentials (llaep) alterations in individuals with tinnitus are suggestive of dysfunction in the central auditory pathways at a cortical level. aim: to characterize the llaep in individuals with and without tinnitus exposed to occupational noise. method: cross-sectional contemporary cohort, prospective study. sixty subjects exposed to occupational noise, ranging in age from 29 to 50 years underwent llaep assessment; 30 of them had tinnitus complaint and 30 did not have tinnitus. results: we observed significant statistical difference regarding the mean values of latencies of waves n1 (p<0.001), p2 (p=0.002) and p300 (p=0.039) when we compared individuals with and without tinnitus. in individuals with tinnitus we also noticed a greater number of altered results concerning components n1 (60%) and p2 (66.7%), although only component p2 presented significant statistical difference (p=0.010). for the llaep, the latency increase was the only type of alteration found (p=1.000). we found a greater association between bilateral tinnitus and bilateral alteration for all components n1(73%), p2(73%) and p300(50%). conclusion: it is relevant to study llaep in individuals with tinnitus exposed to high occupational sound pressure levels.
Potenciais evocados auditivos de longa latência em crian?as com transtorno fonológico
Leite, Renata Aparecida;Wertzner, Haydée Fiszbein;Matas, Carla Gentile;
Pró-Fono Revista de Atualiza??o Científica , 2010, DOI: 10.1590/S0104-56872010000400034
Abstract: background: auditory evoked potentials in children with phonological disorder. aim: to characterize the long latency auditory evoked potentials (llaep) results n1, p2, n2 and p300 of children with phonological disorder and to verify the improvement of such potentials with speech therapy. method: 25 children without phonological disorder (control group) and 41 with phonological disorder (study group) underwent a basic audiological evaluation and llaep. the study group was divided into two subgroups: subgroup a composed by 22 children, underwent 12 sessions of speech therapy and were submitted to audiological retesting after this period, and subgroup b composed by 19 children, who were also reassessed three months after the initial testing. results: statistically significant differences between groups for the p2 and p300 latencies and p300 amplitude were observed. comparison between the first and the second audiological assessments indicated no significant statistical differences between both subgroups regarding wave latencies. however, a significant statistical difference was verified for the p300 (study subgroup a) and p2/n2 (study subgroup b) wave amplitudes. the study group presented higher percentage of altered results in the p300; wave latency increase was the most frequent type of alteration. after speech therapy, the results of all components improved, however, there was no association between the improvement of llaep results with the background of otitis, as well as with the percentage of consonants correct-revised. conclusion: children with phonological disorder present altered p300 suggesting involvement of the central auditory pathway, probably due to alterations in the auditory processing, presenting improvement in all components of llaep results after speech therapy.
Potenciais evocados auditivos de longa latência em adultos com HIV/Aids
Silva, Aline Covo da;Pinto, Fernanda Rodrigues;Matas, Carla Gentile;
Pró-Fono Revista de Atualiza??o Científica , 2007, DOI: 10.1590/S0104-56872007000400005
Abstract: background: long latency auditory evoked potentials. aim: to characterize the long latency auditory evoked potentials (llaep) in individuals with hiv/aids in comparison to a control group. method: the research sample was composed by 21 individuals with hiv/aids - research group (14 male and 7 female), with ages ranging from 31 to 48 years, and 21 healthy individuals - control group (5 male and 16 female), with ages ranging from 19 to 36 years. the latency and amplitude values of the p300 wave were analyzed; latency of n1 and p2 waves, and amplitude n1-p2. the electrodes were placed on the following positions: a1, a2, cz and fpz. results: the t-student test was used to analyze the results and the adopted significance level was of 5%. in the analyzes of p300 it was observed that the group with hiv/aids presented greater latency values (p-value = 0,010) and lower amplitude values (p-value = 0,021) when compared to the control group. the analysis of the n1-p2 complex revealed that the research group presented higher latency values for both, n1 wave (p-value = 0,035) and p2 wave, however for this last one, there was no significant statistical difference when compared to the control group. concerning the amplitude analysis of the n1-p2 complex, it was verified that the control group presented significantly higher values when compared to the research group. conclusion: the findings of this study indicates that individuals with hiv/aids present alterations in the long latency auditory evoked potentials (higher latencies and lower amplitudes of n1, p2 and p300 waves), suggesting a disorder in the cortical regions of the auditory pathway, and therefore stressing the importance of such tests in the evaluation of these individuals.
Potenciais evocados auditivos de média e longa latências em adultos com AIDS
Matas, Carla Gentile;Juan, Kleber Ramos de;Nakano, Renata Agnello;
Pró-Fono Revista de Atualiza??o Científica , 2006, DOI: 10.1590/S0104-56872006000200006
Abstract: background: middle and late latency auditory evoked potentials. aim: to verify the occurrence of middle and late latency auditory evoked potentials disorders in adults with acquired immunodeficiency syndrome (aids). method: middle and late latency auditory evoked potentials of 8 individuals with aids, with ages ranging from 10 to 51 years, with normal hearing, or with sensoryneural hearing losses up to moderate, and normal results in the auditory brainstem response, comparing the results with the responses obtained for a control group which was composed by 25 individuals, with ages ranging from 19 to 24 years, with no hearing complaints and with normal hearing and normal results in the auditory brainstem response. results: the pa wave latency and amplitude averages in the c3/a2 and c4/a1 modalities, and the average of the p300 wave were analyzed. no significant differences were observed in the pa wave amplitude and latency averages between the groups, although a non-statistically significant increase was observed in the latency and a decrease in the amplitude of such wave for the research group in the c3/a2 modality. the latency of the p300 wave was significantly longer to the left for the research group. it was also observed a longer latency to the right, although this was not statistically significant. conclusion: adult individuals with aids do not present alterations in the middle latency auditory evoked potential and do present alterations in the cognitive potential, indicating a disorder in the cortical regions of the auditory pathway and a deficit in the cognitive processing of auditory information for this population. such findings stress the importance of a careful investigation of the auditory function of individuals with aids, thus favoring the therapeutic planning.
Embryonic desiccation resistance in Aedes aegypti: presumptive role of the chitinized Serosal Cuticle
Gustavo Rezende, Ademir Martins, Carla Gentile, Luana Farnesi, Marcelo Pelajo-Machado, Alexandre Peixoto, Denise Valle
BMC Developmental Biology , 2008, DOI: 10.1186/1471-213x-8-82
Abstract: We observed an abrupt acquisition of desiccation resistance during Ae. aegypti embryogenesis associated with serosal cuticle secretion, occurring at complete germ band extension, between 11 and 13 hours after egglaying. After SC formation embryos are viable on dry for at least several days. The presence of chitin as one of the SC constituents was confirmed through Calcofluor and WGA labeling and chitin quantitation. The Ae. aegypti Chitin Synthase A gene (AaCHS1) possesses two alternatively spliced variants, AaCHS1a and AaCHS1b, differentially expressed during Ae. aegypti embryonic development. It was verified that at the moment of serosal cuticle formation, AaCHS1a is the sole variant specifically expressed.In addition to the peritrophic matrix and exoskeleton, these findings confirm chitin is also present in the mosquito serosal cuticle. They also point to the role of the chitinized SC in the desiccation resistance of Ae. aegypti eggs. AaCHS1a expression would be responsible for SC chitin synthesis. With this embryological approach we expect to shed new light regarding this important physiological process related to the Ae. aegypti life cycle.The mosquito Aedes aegypti is the main dengue vector. One of the major problems concerning dengue transmission is that Ae. aegypti eggs resist desiccation, surviving several months under dry conditions in a dormancy state at the end of their embryonic development [1-3]. An important component of the desiccation resistance is the serosal cuticle (SC), a layer covering the embryo that is synthesized at early embryogenesis [4-7] (for review see [2]). The serosal cuticle is secreted by the serosa, a membrane formed by extra-embryonic cells that surrounds the whole embryo of many insects [2,8-11]. Upon oviposition, the mosquito eggshell is composed of two layers, a compound exochorion and a smooth endochorion [12]. The SC develops during embryogenesis and becomes the third eggshell layer, lying beneath the endochorion [2,4]. It sh
Ecology of mosquitoes (Diptera: Culicidae) in areas of Serra do Mar State Park, State of S?o Paulo, Brazil. II - Habitat distribution
Guimar?es, Anthony érico;Gentile, Carla;Lopes, Catarina Macedo;Mello, Rubens Pinto de;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000100002
Abstract: the mosquito (diptera: culicidae) ecology was studied in areas of serra do mar state park, state of s?o paulo, brazil. systematized biweekly human bait collections were made three times a day, for periods of 2 or 3 h each, in sylvatic and rural areas for 24 consecutive months (january 1991 to december 1992). a total of 24,943 adult mosquitoes belonging to 57 species were collected during 622 collective periods. aedes scapularis, coquillettidia chrysonotum, cq. venezuelensis, wyeomyia dyari, wy. longirostris, wy. theobaldi and wy. palmata were more frequently collected at swampy and at flooded areas. anopheles mediopunctatus, culex nigripalpus, ae. serratus, ae. fulvus, psorophora ferox, ps. albipes and the sabethini in general, were captured almost exclusively in forested areas. an. cruzii, an. oswaldoi and an. fluminensis were captured more frequently in a residence area. however, cx. quinquefasciatus was the only one truly eusynanthropic. an. cruzii and ae. scapularis were captured feeding on blood inside and around the residence, indicating that both species, malaria and arbovirus vectors respectively, may be involved in the transmission of these such diseases in rural areas.
Ecology of mosquitoes (Diptera: Culicidae) in areas of Serra do Mar State Park, State of S?o Paulo, Brazil. I - Monthly frequency and climatic factors
Guimar?es, Anthony érico;Mello, Rubens Pinto de;Lopes, Catarina Macedo;Gentile, Carla;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000100001
Abstract: the ecology of mosquitoes were studied (diptera: culicidae) in areas of serra do mar state park, state of s?o paulo, brazil. systematized monthly human bait collections were made three times a day, for periods of 2 or 3 h each, in sylvatic and rural areas for 24 consecutive months (january 1991 to december 1992). a total of 24,943 specimens of adult mosquitoes belonging to 57 species were collected during 622 collective periods. coquillettidia chrysonotum was the most frequent collected mosquito (45.8%) followed by aedes serratus (6.8%), cq. venezuelensis (6.5%), psorophora ferox (5.2) and ps. albipes (3.1%). the monthly averages of temperature and relative humidity were inserted in the ten-year average limits of maximum and minimum of the previous ten-years. rainfall accompanied the curve of the ten-year averages. those climatic factors were influential in the incidence of some species; temperature: anopheles cruzii, an. mediopunctatus, ae. scapularis, ae. fulvus, cq. chrysonotum, cq. venezuelensis, runchomyia reversa, wyeomyia dyari, wy. confusa, wy. shannoni, wy. theobaldi and limatus flavisetosus; relative humidity: ae. serratus, ae. scapularis, cq. venezuelensis and ru. reversa; rainfall: an. cruzii, ae. scapularis, ae. fulvus, cq. venezuelensis ru. reversa, wy. theobaldi and li. flavisetosus.
Prevalência de Anofelinos (Diptera: Culicidae) no Crepúsculo Vespertino em áreas da Usina Hidrelétrica de Itaipu, no Município de Guaíra, Estado do Paraná, Brasil
Guimar?es, Anthony érico;Mello, Rubens Pinto de;Lopes, Catarina Macedo;Alencar, Jeronimo;Gentile, Carla;
Memórias do Instituto Oswaldo Cruz , 1997, DOI: 10.1590/S0074-02761997000600004
Abstract: systematic collections of anophelines were conducted from november 1994 to august 1995 from 18:00 to 20:00 hr using shannon traps and human-bait along the lake margin which forms the itaipu hydroelectric reservoir, state of paraná, brazil. species prevalence was studied at 15 min intervals. anopheles albitarsis sensu latu and an. galvaoi, were the most frequently collected mosquitoes. all anopheles species populations peaked between 18:45 and 19:30 hr. the observations illustrate the existence of a haematophagic activity cycle during the early evening hours: exogenous stimulus (the beginning of sunset) ? shannon trap (light attraction) ? human bait (haematophagy) ? rest and digestion ? exogenous stimulus ? shannon trap or surrounding vegetation. the greater abundance of an. albitarsis collected in human-bait and shannon trap suggests it may be a potential malaria vector in the region
Ecology of mosquitoes (Diptera: Culicidae) in areas of Serra do Mar State Park, State of S?o Paulo, Brazil. III - daily biting rhythms and lunar cycle influence
Guimar?es, Anthony érico;Gentile, Carla;Lopes, Catarina Macedo;Mello, Rubens Pinto de;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000600002
Abstract: the ecology of mosquito species (diptera: culicidae) was studied in areas of the serra do mar state park, state of s?o paulo, brazil. the influence of the lunar cycle and the daily biting rhythms of mosquito populations were analyzed. systematized biweekly human bait collections were made in a silvatic environment for 24 consecutive months (january 1991 to december 1992). a total of 20,591 specimens of adult mosquitoes belonging to 55 species were collected from 545 catches. sabethini species were captured exclusively during daylight periods, with the exception of trichoprosopon digitatum, while members of anophelinae predominated during nocturnal hours. members of the subfamily culicinae that were collected primary during nocturnal periods included culex nigripalpus, coquillettidia chrysonotum and cq. venezuelensis while daytime catches included psorophora ferox and ps. albipes. others members of culicines mosquitoes that were collected during both day and night included: aedes serratus, ae. scapularis and ae. fulvus. lunar cycles did not appear to influence the daily biting rhythms of most mosquito species in the area, but larger numbers of mosquitoes were collected during the new moon. ae. scapularis were captured mainly during the full moon.
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