RESUMO
Swine wastewater treatment is a complex challenge, due to the high organic matter (OM) and nitrogen (N) concentrations which require an efficient process. This study focused on evaluating two different support media for OM and N removal from an Upflow Anaerobic Sludge Blanket (UASB) reactor fed with swine wastewater. Maximum specific nitrification (MSNA) and denitrification (MSDA) activity test for both biofilm and suspended biomass were carried out using as supports: polyurethane foam (R1) and polyethylene rings (R2). The results showed that R2 system was more efficiently than R1, reaching OM removal of 77 ± 8% and N of 98 ± 4%, attributed to higher specific denitrifying activity recorded (5.3 ± 0.34 g NO3-N/g TVSâh). Furthermore, 40 ± 5% of the initial N in the wastewater could have been transformed into molecular nitrogen through SND, of which only 10 ± 1% was volatilized. In this sense, MSDA tests indicated that suspended biomass was responsible for at least 70% of N removal and only 20% can be attributed to biofilm. SND could be confirmed with the analysis of microbial diversity, due to the presence of the genus Pseudomonas dominated the prokaryotic community of the system in 54.4%.
RESUMO
Extracorporeal shock wave lithotripsy (ESLW) is a common and relatively safe procedure, with a high success rate and low adverse effects. Complications of this procedure are usually limited to the kidneys and almost always resolve spontaneously. However, on rare occasions, a frightening complication, as a hematoma of a parenchymatous organ, such as the liver can appear. Abdominal pain is usually the only manifestation when a liver hematoma develops, and should always be investigated, as this dreaded complication can put the patient's life at risk. Conservative treatment is usually the treatment of choice, nevertheless, on severe cases that do not respond to conservative measures, surgery or embolization is necessary. We report the case of a 38-year-old male who underwent ESWL, 12 h after the procedure he presented to the emergency room with severe abdominal pain, after complementary exams a liver hematoma was detected. Following conservative management, the patient fully recovered.
RESUMO
Hexavalent chromium (Cr VI) from industrial wastewaters represents a highly toxic source at low concentrations. Biological treatments with anaerobic granular biomass are a promising alternative for the Cr VI bioremediation. This study evaluated the Cr VI removal in a range of 5-500â¯mg/L, using an active anaerobic granular consortium. Two removal mechanisms were differentiated from the assays: 1) biological reduction of 70â¯mg/L to Cr III at a concentration of 250â¯mg Cr VI/L and 2) physical bioadsorption of 297â¯mg of Cr VI/L or 31.39â¯mg of Cr VI/gbiomass at concentration of 500â¯mg Cr VI /L. The half-maximal inhibitory concentration (IC50) values for the rate and production of methane were 1.4 and 253â¯mg/L, respectively. In addition, Cr VI is a biostimulant that increase the methane production, in a range from 5 to 100â¯mg/L, of the anaerobic consortium. This work demonstrates the potential application of the anaerobic granular consortium in metal bioremediation.
Assuntos
Cromo/análise , Consórcios Microbianos , Águas Residuárias/química , Poluentes Químicos da Água/análise , Purificação da Água/métodos , Anaerobiose , Biodegradação Ambiental , Biomassa , Metano/biossínteseRESUMO
O gênero Eleocharis R. Br. compreende cerca de 200 espécies, ocorrendo em ambientes úmidos tais como brejos e margens de rios e lagos. Procurando novos agentes moluscicidas, os extratos de Eleocharis acutangula (Roxb.) Schult., Eleocharis interstincta (Vahl) Roem. & Schult., Eleocharis maculosa (Vahl) Roem. & Schult. e Eleocharis sellowiana Kunth foram testados para atividade moluscicida, contra caramujos adultos e desovas, e toxicidade (ensaio de letalidade com Artemia salina). O extrato hexânico de Eleocharis acutangula (parte subterrânea fresca) foi ativo contra Artemia salina (CL50 = 476,00 mg/mL), enquanto os demais extratos apresentaram CL50 >> 10³ mg/mL, sugerindo baixa toxicidade. O extrato hidro-etanólico de Eleocharis sellowiana (parte subterrânea fresca) foi ativo contra desovas de Biomphalaria glabrata (CL50 = 24,27 mg/mL) mas inativo contra indivíduos adultos. Os demais extratos testados não apresentaram atividade moluscicida.
The genus Eleocharis R. Br. comprises about 200 species, occurring in wet environments like swamps, lakes and river margins. In the search for new molluscicides, extracts from Eleocharis acutangula (Roxb.) Schult., Eleocharis interstincta (Vahl) Roem. & Schult., Eleocharis maculosa (Vahl) Roem. & Schult. and Eleocharis sellowiana Kunth were tested for molluscicidal activity (spawns and adult snails) and toxicity (Brine Shrimp Lethality - BSL - bioassay). The hexane extract of Eleocharis acutangula (fresh subterraneous parts) was active in the BSL bioassay (LC50 = 476 mg/mL), while the other extracts showed LC50 >> 10³ mg/mL, suggesting they have low toxicity. The aqueous ethanol extract of Eleocharis sellowiana (fresh subterraneous parts) was active against Biomphalaria glabrata spawns (LC50 = 24.27 mg/mL) but it was not lethal to adult snails. No other plant extract tested in this study showed molluscicidal activity.
Assuntos
Humanos , Idoso , Seguimentos , Comportamento Alimentar , Institucionalização , OsteoporoseAssuntos
Humanos , Idoso , Osteoporose , Institucionalização , Comportamento Alimentar , SeguimentosRESUMO
Liver infection as a result of tuberculosis is well known; there are several histological lesions, the most important being epithelioid cell granuloma. There are 3 anatomo-clinic variants: military or micronodular type, macronodular or pseudotumoral and pericanalicular of cholestatic. A case of a 66 year old male with a diagnosis of hepatic pseudotumoral tuberculosis, confirmed by means of a laparoscopy, is presented. The rareness of this particular presentation is discussed, as well as the difficult diagnosis due to confusion with primary or metastatic tumors of the liver.
Assuntos
Granuloma/diagnóstico , Neoplasias Hepáticas/diagnóstico , Tuberculose Hepática/diagnóstico , Idoso , Diagnóstico Diferencial , Humanos , MasculinoRESUMO
A total of 164 isolations of Serratia marcescens achieved during 1978-1979 at the Hospital Infantil de México in children with various pathology due to this bacteria were studied. Most of the cases were debilitated patients from the newborns and prematures wards and contagious and surgery departments. The most frequent isolations were from wounds and abscesses (76 cases), the same as from meningitis (22 cases) and sepsis (12 patients). Serratia marcescens showed a high degree of resistance (87-100%) to the following antibiotics: carbenicillin, colimycin, chloramphenicol, phosphomicin, ampicillin and cephalothin. To gestamicin and kanamycin, 42% of strains were sensitive. Amikacin was the most effective drug with 92% of strains susceptible to it. The history of this bacteria, its mode of transmission, frequency of infections and resistance to antibiotics found in foreign institutions are commented. Likewise, the difficulty for the precision bacteriologic diagnosis is emphasized as the possible main cause for the ignorance in Mexico of infections due to this bacteria.