Reduction of scum production in a modified UASB reactor treating domestic sewage.

The scum accumulation inside gas-solid-liquid separators (GSL) is one of the main limitations of upflow anaerobic sequencing batch (UASB) reactors during treatment of domestic sewage. Although this type of reactor can be equipped with devices that periodically remove scum, this solution has been proved to be very expensive in addition to being inefficient when discharging procedures are not correctly performed. The main goal of this study was to investigate the performance of a modified UASB reactor concept with a GSL separator which promotes continuous scum discharge to the settling compartment. Furthermore, this proposal was compared with a conventional UASB reactor which was used as control. Both reactors in demo-scale were fed with domestic wastewater and scum production was measured. The results demonstrated volumetric reduction of 50%, and 75% reduction in the mass of total solids in the modified reactor. Additionally, the amount of biogas recovered from the modified reactor was higher than the amount that the control reactor recovered. Therefore, the proposed modification has been proved to be effective, bringing new possibilities to the GSL project.

Variable Inter-assay Estimation of Sperm DNA Fragmentation In Stallions Classified as Good and Bad Semen Freezers.

BACKGROUND: Semen cryopreservation causes DNA damage, thus requiring continuous monitoring. OBJECTIVE: To compare two assays for sperm DNA fragmentation (SDF) from stallions with contrasting semen freezability. MATERIALS AND METHODS: Thirteen stallions were classified as good semen freezers (GSF) or bad semen freezers (BSF). Ejaculates were cryopreserved with three diluents. Semen was subject to SDF evaluation using the sperm chromatin structure assay (SCSA) and Halomax after thawing (0 h) and after a 4 h thermoresistance test. RESULTS: On semen of BSF, analysis by SCSA was similar between evaluations, but Halomax showed increased SDF at 4 h. The GSF group was similar between time points in both assays. Diluents did not affect SDF, irrespective of the assay. Halomax showed differences for BSF between time points, differently from SCSA. Linear regression did not show any correlation between assays. CONCLUSION: The use of Halomax should be encouraged for sperm DNA fragmentation analysis in horse frozen-thawed semen, particularly under field conditions.

Leishmania (Viannia) braziliensis in dogs in Brazil: epidemiology, co-infection, and clinical aspects.

Leishmaniasis is an endemic disease present in 98 countries. In Brazil, the northeast region accounts for approximately half of the cases in humans, and has experienced an increased number of positive cases in dogs. In this study, we investigated the epidemiology of canine leishmaniasis in the city of Ilhéus, Bahia, using serological and molecular techniques and evaluated the possible environmental risk factors and associated clinical signs. Blood samples were collected from 560 dogs in urban and peri-urban areas in Ilhéus, northeastern Brazil. Genomic DNA was extracted from the selected animals and subjected to molecular analysis using Leishmania species-specific primers and diagnosis of Trypanosoma cruzi. A total of 54.72% of dogs were positive for Leishmania braziliensis, and animals positive for both Leishmania infantum and T. cruzi were not identified. Hematologic variables were not statistically associated with cases of L. braziliensis. However, the positive animal group showed lower red blood cell and platelet counts and higher levels of urea and serum creatinine. Few dogs presented clinical signs compatible with the presence of Leishmania. Age of more than 2 years and specific hair colors were associated with positive results for L. braziliensis. The geoclimatic characteristics of the region may improve parasite survival, reproduction, and vectors. This may explain the higher rate of dogs identified as positive in this study.

Effect of nonsurgical periodontal therapy on serum and gingival crevicular fluid cytokine levels during pregnancy and postpartum.

BACKGROUND AND OBJECTIVE: A low-grade systemic inflammatory status originating from periodontal infection has been proposed to explain the association between periodontal disease and systemic conditions, including adverse obstetric outcomes. The aim of this study was to evaluate the effect of periodontal therapy during pregnancy on the gingival crevicular fluid and serum levels of six cytokines associated with periodontal disease and preterm birth. MATERIAL AND METHODS: A subsample of 60 women (18-35 years of age) up to 20 gestational weeks, previously enrolled in a larger randomized clinical trial, was recruited for the present study. Participants were randomly allocated to receive either comprehensive nonsurgical periodontal therapy before 24 gestational weeks (n = 30, test group) or only one appointment for supragingival calculus removal (n = 30, control group). Clinical data, and samples of blood and gingival crevicular fluid, were collected at baseline, at 26-28 gestational weeks and 30 d after delivery. The levels of interleukin (IL)-1ß, IL-6, IL-8, IL-10, IL-12p70 and tumor necrosis factor-α were analyzed by flow cytometry. RESULTS: After treatment, a major reduction in periodontal inflammation was observed in the test group, with bleeding on probing decreasing from 49.62% of sites to 11.66% of sites (p < 0.001). Periodontal therapy significantly reduced the levels of IL-1ß and IL-8 in gingival crevicular fluid (p < 0.001). However, no significant effect of therapy was observed on serum cytokine levels. After delivery, the levels of IL-1ß in the gingival crevicular fluid of the test group were significantly lower than were those in the control group (p < 0.001), but there were no significant differences between test and control groups regarding serum cytokine levels. CONCLUSION: Although periodontal therapy during pregnancy successfully reduced periodontal inflammation and gingival crevicular fluid cytokine levels, it did not have a significant impact on serum biomarkers.

Paralisia supranuclear progressiva

A paralisia supranuclear progressiva é uma doença rara com predomínio no sexo masculino descrita entre as patologias conhecidas como parkinsonismo atípico. Y.O.N, 66 anos, branca, feminina, brasileira, residente em São Paulo, nível superior, enfermeira aposentada. Queixava-se de disfonia associada à perda de peso progressiva, dificuldade em iniciar movimentos, lentificação, rigidez, apatia, desmotivação, tonturas e quedas freqüentes há aproximadamente 3 anos. Neste período, refere piora progressiva da marcha. Há 1 ano apresentou queda com luxação de ombro direito sendo submetida a procedimento cirúrgico. No último ano iniciou com quadro de distúrbio comportamental, irritabilidade, desinibição e agressividade. Negava comorbidades prévias. Ao exame físico geral apresentava-se emagrecida, com hiperextensão de tronco e coluna cervical, alteração da marcha com necessidade de auxílio, fáscies de espanto, disartria, perda do olhar vertical para baixo. Força muscular diminuida +/5+ em membros inferiores com atrofia muscular, rigidez, sem tremores de extremidade. MEEM 28/30 FV 8/minuto, Teste do relógio 0. À ressonância magnética apresentou sinais de dilataçãodo sistema ventricular, alargamento dos sulcos corticais, cisternas basais e sylvianas, raras zonas de alteração da intensidade de sinal localizada na substância branca periventricular compatíveis com áreas de glicose. O quadro clínico e a perda do olhar conjugado vertical para baixo sugeriram uma hipótese diagnóstica de possível paralisia supranuclear progressiva. O relato de caso demonstra a dificuldade do diagnóstico de pacientes que apresentam déficit cognitivo, alteração de comportamento e alterações neurológicas e um alerta à comunidade científica da possibilidade desse diagnóstico

Paralisia supranuclear progressiva / Progressive supranuclear palsy

A paralisia supranuclear progressiva é uma doença rara com predomínio no sexo masculino descrita entre as patologias conhecidas como parkinsonismo atípico. Y.O.N, 66 anos, branca, feminina, brasileira, residente em São Paulo, nível superior, enfermeira aposentada. Queixava-se de disfonia associada à perda de peso progressiva, dificuldade em iniciar movimentos, lentificação, rigidez, apatia, desmotivação, tonturas e quedas freqüentes há aproximadamente 3 anos. Neste período, refere piora progressiva da marcha. Há 1 ano apresentou queda com luxação de ombro direito sendo submetida a procedimento cirúrgico. No último ano iniciou com quadro de distúrbio comportamental, irritabilidade, desinibição e agressividade. Negava comorbidades prévias. Ao exame físico geral apresentava-se emagrecida, com hiperextensão de tronco e coluna cervical, alteração da marcha com necessidade de auxílio, fáscies de espanto, disartria, perda do olhar vertical para baixo. Força muscular diminuida +/5+ em membros inferiores com atrofia muscular, rigidez, sem tremores de extremidade. MEEM 28/30 FV 8/minuto, Teste do relógio 0. À ressonância magnética apresentou sinais de dilataçãodo sistema ventricular, alargamento dos sulcos corticais, cisternas basais e sylvianas, raras zonas de alteração da intensidade de sinal localizada na substância branca periventricular compatíveis com áreas de glicose. O quadro clínico e a perda do olhar conjugado vertical para baixo sugeriram uma hipótese diagnóstica de possível paralisia supranuclear progressiva. O relato de caso demonstra a dificuldade do diagnóstico de pacientes que apresentam déficit cognitivo, alteração de comportamento e alterações neurológicas e um alerta à comunidade científica da possibilidade desse diagnóstico (AU)

Selective extraction of carotenoids from the microalga Dunaliella salina with retention of viability.

Simultaneous production and selective extraction of beta-carotene from living cells of Dunaliella salina in a two-phase system of aqueous and organic phases has been investigated. Solvents with values of log P(octanol), which denotes hydrophobicity of a compound, ranging from 3 to 9 were used as organic phase. Viability and activity of Dunaliella salina in the presence of organic solvents were checked by microscopic observation and photosynthetic oxygen-production-rate measurements, respectively. Extraction ability of different solvents for both beta-carotene and chlorophyll was determined spectrophotometrically. In addition, beta-carotene contents of the cells growing in the aqueous phase and extracted beta-carotene by the different organic phases were quantified by the same method. Results showed that solvents having log P(octanol) > 6 can be considered biocompatible for this alga. Moreover, pigment extraction ability of a solvent is inversely dependent on its log P(octanol) value. By increasing the degenerative hydrophobicity the extraction ability for both chlorophyll and beta-carotene, decreases. However, this decrease is more profound for chlorophyll. Therefore, selective extraction of beta-carotene becomes feasible. Comparison of the total beta-carotene produced in the presence and in the absence of solvents shows that the presence of a second phase of biocompatible solvents in the culture media may induce the beta-carotene production pathway. The beta-carotene productivity per cell in a two-phase system with dodecane was the highest observed. Extraction ability of the biocompatible solvents dodecane, tetradecan, and hexadecane was similar.

Acetate as a carbon source for hydrogen production by photosynthetic bacteria.

Hydrogen is a clean energy alternative to fossil fuels. Photosynthetic bacteria produce hydrogen from organic compounds by an anaerobic light-dependent electron transfer process. In the present study hydrogen production by three photosynthetic bacterial strains (Rhodopseudomonas sp., Rhodopseudomonas palustris and a non-identified strain), from four different short-chain organic acids (lactate, malate, acetate and butyrate) was investigated. The effect of light intensity on hydrogen production was also studied by supplying two different light intensities, using acetate as the electron donor. Hydrogen production rates and light efficiencies were compared. Rhodopseudomonas sp. produced the highest volume of H2. This strain reached a maximum H2 production rate of 25 ml H2 l(-1) h(-1), under a light intensity of 680 micromol photons m(-2) s(-1), and a maximum light efficiency of 6.2% under a light intensity of 43 micromol photons m(-2) s(-1). Furthermore, a decrease in acetate concentration from 22 to 11 mM resulted in a decrease in the hydrogen evolved from 214 to 27 ml H2 per vessel.

On the microbiological profile of traditional Portuguese sourdough.

Traditional manufacture of bread from maize has been noted to play important roles from both economic and social standpoints; however, enforcement of increasingly strict hygiene standards requires thorough knowledge of the adventitious microbiota of the departing dough. To this goal, sourdough as well as maize and rye flours from several geographic locations and in two different periods within the agricultural year were assayed for their microbiota in sequential steps of quantification and identification. More than 400 strains were isolated and taxonomic differentiation between them was via Biomerieux API galleries (375 of which were successfully identified) following preliminary biochemical and morphological screening. The dominant groups were yeasts and lactic acid bacteria (LAB). The most frequently isolated yeasts were Saccharomyces cerevisiae and Candida pelliculosa. The most frequently isolated LAB were (heterofermentative) Leuconostoc spp. and (homofermentative) Lactobacillus spp.; L. brevis, L. curvatus, and L. lactis ssp. lactis were the dominant species for the Lactobacillus genera; Lactococcus lactis ssp. lactis for lactococci; Enterococcus casseliflavus, E. durans, and E. faecium for enterococci; and Streptococcus constellantus and S. equinus for streptococci.

Resection for achalasia of the esophagus.

One hundred and twenty-two patients with advanced mega-esophagus managed by esophagectomy without thoracotomy and cervical gastroplasty were evaluated. Sixty-nine patients were followed up for periods of 6 months to 16 years. Clinical assessment included X-ray studies and endoscopy of the cervical esophagus and mobilized stomach. The most common postoperative complications were pleural effusion (22.1%) and cervical fistula (8.2%). Mortality was 4.18%. Regurgitation was the most frequent complaint in the late follow-up, followed by heartburn. Both symptoms were related to esophagitis and diffuse gastritis. Diarrhea and dumping also occurred due to vagotomy and pyloromyotomy performed at the same time as esophagectomy. The endoscopic study demonstrated esophagitis in 25.5% of the patients, and diffuse erosive gastritis in 12.7%. The symptoms and late complications were handled by clinical measures and careful endoscopic follow-up. Gastroplasty was considered a good procedure for replacing the esophagus, solving the serious problem of dysphagia and for providing nutritional improvement for the patient.

Nocturnal rhythm of growth hormone in Duchenne patients: effect of different doses of mazindol and/or cyproheptadine.

Human growth hormone (hGH) inhibition may be beneficial for Duchenne muscular dystrophy (DMD) patients and slow the rate of progression of the disease. The purpose of the present investigation was 1) to assess, before any therapeutic trial, the natural growth hormone (GH) rhythm during physiological sleep in DMD patients and in normal control boys of comparable age; 2) to evaluate the effect of different doses of two potential GH inhibitors on nocturnal GH secretion in DMD patients receiving mazindol (1-4 mg), cyproheptadine (4-8 mg), or both drugs. The results from the present investigation showed 1) wide variability in nocturnal GH secretion before medication; 2) no correlation between nocturnal GH concentration and height, age, bone age, L-dopa provocative test, or Tanner staging; and 3) no consistent effect on GH release after mazindol, cyproheptadine therapy, or combined therapy.

Effect of mazindol on growth hormone levels in patients with Duchenne muscular dystrophy.

Human growth hormone (HGH) inhibition may be beneficial in Duchenne muscular dystrophy (DMD) and slow down the rate of progression of the disease. The purposes of the present investigation were: 1) to assess, through pharmacological stimuli (L-dopa test), the HGH response in untreated DMD patients, and 2) to evaluate the inhibitory effect of mazindol on HGH levels as a potential treatment for DMD. In 55 DMD patients, HGH levels were measured through the L-dopa test, and 40 received mazindol. After 1 year, there was wide variability in the individual response to mazindol. An apparent diminution in the mean HGH level was observed in the whole group of patients; this was statistically significant after 3 and 6 months but not after 9 and 12 months of treatment. The results suggest that this drug is not effective for arresting growth or inhibiting HGH secretion for a prolonged period of time.

Relation between height and clinical course in Duchenne muscular dystrophy.

We have evaluated the relation between height and rate of clinical progression in boys with Duchenne muscular dystrophy (DMD). In all, 111 DMD patients with age ranging from 2 to 23 years (mean 8.2 +/- 3.4 years) were assessed; of these patients, 92 had their height measured. Clinical course was determined through Vignos scale of functional disability, motor ability, and timed functional tests. All patients had grossly elevated serum creatine-kinase (CK) and pyruvate-kinase (PK) levels. When height was adjusted for patients' age, a statistically significant correlation was found between height and clinical course (positive with Vignos scale and negative with motor ability), suggesting that smaller boys have a better clinical course than taller patients of comparable age. These results support our previous hypothesis and suggest that growth inhibition seems to be effective in diminishing the progression of DMD.

Ethnography and bioassay: combined methods for a preliminary screen of home remedies for potential pharmacological activity.

This paper introduces a combined set of anthropological and biological research techniques that allow a single researcher to conduct a field-based screen of ethnopharmaceutical resources, even under difficult field conditions. The results of one such screen, presented here, indicate that the most commonly used remedies in an ethnomedical system are also those most likely to contain active constituents. Several pragmatic and theoretical considerations deriving from these results are discussed.

Considerations on the new epidemic outbreak of human leptospirosis in greater recife, brasil, in 1975.

Abstract- A brief report was presented on a new outbreak of leptospirosis among the population of Greater Recife in 1975 in the wake of the floods that struck the city and its survivors in July of that year. A total of 107 cases were recorded, of which 105 were identified by sero-agglutination and 2 by hemoculture. Once again the serotype icterohaemorrhagiae was the predominant etiological agent, having been found in 55 cases, followed by ballum in 18, grippotyphosa in 9, and pyrogenes in 8 cases.