Surgical treatment of type 2 giant mesenteric cyst: case report and literature review

Mesenteric lesions, including cysts, are rare abdominal tumours and in most cases non-neoplastic. They may have an asymptomatic course or present with pain, abdominal distension or intestinal obstruction. The suggested management is surgical resection of the lesions by laparotomy or minimally invasive surgery. We presented the case of a 48-year-old patient with progressive abdominal distension attributed to liver cirrhosis. Ultrasound and computed tomography of the abdomen showed evidence of a giant cyst of the mesentery with no evidence of tumor activity. We therefore decided to perform an exploratory laparotomy with cystectomy and omentectomy, follow-up and pathology report negative for malignancy

Occupational and Environmental Risks from Mancozeb in Aviation Facilities in the Banana Producing Area of Teapa, Tabasco, Mexico

Purpose: To identify occupational risks and practices in the four aerial fumigation facilities in the Sierra banana growing region and to evaluate environmental impacts from Mancozeb use.Methods: Occupational health risks were identified and practices in the four aerial fumigation facilities in the Sierra banana growing region were documented. Semi-structured interviews were conducted with installation managers. To evaluate environmental impact, samples of water and soil were collected and analysed in an acute toxicity bioassay with Vibrio fischeri, using uncontaminated soil and water to establish background levels.Results: Even in the largest and best-equipped facility, serious risks to workers’ health were encountered from inadequate use of protective equipment by workers. Furthermore, excessive use of pesticide, lack of re-use of unused product, poor facility design and poor use of wash-water were observed, resulting in  maximum toxicity of > 5 times background in discharged water. Parallel soil samples were > 20 times  more toxic than background, being most toxic at > 0.5 km from the discharge point.Conclusion: Areas of opportunity to improve worker health and the environment include proper and  consistent use of protective equipment, re-use of unused product, wastewater reduction and appropriate wastewater treatment.Keywords: Black Sigatoka, Ethylene thiourea, Fumigation, Pesticide, Mancozeb, Airports, Microtox, Vibrio fischeri, Occupational health risks, Toxicit

Intestinal resection and primary anastomosis as treatment of intussusception due to ileum lipoma: case report and review

Intussusception is an unusual cause of intestinal occlusion in adults, accounting for 5% of cases, and is the result of an underlying pathology in 90% of cases, 60% of which are tumors. The pathogenesis describes the invagination of an intestinal segment into the lumen of an adjacent segment with subsequent alterations in irrigation, risk of necrosis and perforation. Surgical management is indicated in adult patients to restore intestinal transit and to exclude malignancy as the axis of the intussusception. We present the case of a 58-year-old female patient with enteric intussusception at ileum due to lipoma, who underwent bowel resection and manual end-to-end intestinal anastomosis in two planes

Inguinal plasty and appendectomy as treatment for Amyand's hernia: case report and literature review

Amyand's hernia is described as the presence of the caecal appendix within the hernial sac of an incarcerated inguinal hernia. It was reported as an incidental finding in 1% of cases and with evidence of appendicitis in 0.1% of cases. The approach involves performing appendectomy and inguinal repair in the same surgical time, depending on the clinical scenario and the surgeon's decisions. We presented the case of a 76-year-old male patient with a diagnosis of Amyand's right inguinal hernia diagnosed during trans-operative right inguinal plasty

Chilaiditi's sign in complicated acute appendicitis: case report and literature review

Chilaiditi's condition refers to the presence of a loop of small intestine or colon between the diaphragm and the hepatic rim, usually due to alterations in the attachment of the liver to the diaphragm. Chilaiditi syndrome is associated with abdominal pain as the most common clinical manifestation. Pneumoperitoneum should always be ruled out in the context of these patients. We presented the case of a male in his eighth decade of life who presented with data suggestive of drug-modified acute appendicitis, for which computed tomography of the abdomen identified acute appendicitis and Chilaiditi's condition. An open appendectomy was performed without complications and the condition resolved

Análisis de calidad de las observaciones GPS en estaciones de operación continua de libre acceso en México

Se realizó la evaluación estadística-comparativa de 65 estaciones de operación continua de libre acceso en México, de enero de 2010 a enero de 2020. El análisis de calidad de las observaciones GPS se llevó a cabo mediante el software TEQC, desarrollado por UNAVCO, considerando cuatro indicadores de calidad en 6 variables: efecto multitrayectoria en la banda L1 y L2, relación señal-ruido en L1 y L2, saltos de ciclo por cada mil observaciones y porcentaje de observaciones registradas/esperadas. El resultado de cada estación se comparó con el estándar de calidad establecido por el IGS para pertenecer a su red, con la finalidad de determinar la calidad de las mismas y el grado de cumplimiento de dicho estándar. Los resultados muestran, en promedio, un grado de cumplimiento de 3.3 de las 6 variables, donde: 6 estaciones cumplen con 5 de las 6 variables; 16 estaciones con 4; 35 con 3; 6 con 2 y 2 con una variable, siendo la estación INEG la de mejor calidad excepto en los saltos de ciclo por cada mil observaciones. Así mismo, se muestra que el efecto multitrayectoria se presenta en mayor cantidad en aquellas estaciones en las que no se realizó cambio de antena, receptor o actualización de firmware, degradando principalmente la recepción de la señal en la banda L2.  A statistical comparative evaluation of 65 continuously operating, free access stations in Mexico was made. The observations were performed from January 2010 to January 2020. The quality check of the GPS observations was carried out by using TEQC software, developed by UNAVCO. Four quality indexes were considered within the quality check, with six variables: multipath effect on L1 and L2 band, percentage of registered/expected observations, signal-to-noise ratio on L1 and L2, and cycle slip per 1000 observations. The results obtained from each station were compared with the quality standard established by IGS in order to belong to its network, this with the goal of determining their quality and the level of meeting the standard. The results show, on average, a meeting 3.3 of the 6 variables, where: 6 stations meet 5 of 6 variables; 16 stations with 4; 35 stations with 3; 6 stations with 2 and 2 station with one variable, being INEG station the best in the quality check except for the cycle slips per 1000 observations. Likewise, it was shown that the multipath effect is greater in those stations that had not antenna/receiver changing or firmware update, mainly degrading the received signal on the L2 band

Pomegranate (Punica granatum L.) Peel Extracts as Antimicrobial and Antioxidant Additives Used in Alfalfa Sprouts

Aqueous and ethanolic pomegranate peel extracts (PPE) were studied as a source of phenolic compounds with antimicrobial, anti-quorum sensing, and antioxidant properties. The aqueous extract showed higher total phenolic and flavonoid content (153.43 mg GAE/g and 45.74, respectively) and antioxidant capacity (DPPH radical inhibition: 86.12%, ABTS radical scavenging capacity: 958.21 mg TE/dw) compared to the ethanolic extract. The main phenolic compounds identified by UPLC-DAD were chlorogenic and gallic acids. The aqueous PPE extract showed antimicrobial activity against Listeria monocytogenes, Salmonella Typhimurium, Candida tropicalis (MICs 19–30 mg/mL), and anti-quorum sensing activity expressed as inhibition of Chromobacterium violaceum violacein production (%). The aqueous PPE extracts at 25 mg/mL applied on alfalfa sprouts reduced psychrophilic bacteria (1.12 Log CFU/100 g) and total coliforms (1.23 Log CFU/100 g) and increased the antioxidant capacity of the treated sprouts (55.13 mol TE/100 g (DPPH) and 126.56 mol TE/100 g (ABTS)) compared to untreated alfalfa. This study emphasizes PPE’s antioxidant and antimicrobial activities in alfalfa sprouts preservation

Race diversity in dryland maize (Zea mays L.) landraces from southern Nuevo León, Mexico

This study was done for reviewing the diversity and distribution of native maize grown at southern Nuevo León, Mexico, in 40 accessions collected in the area. Information obtained was on the production unit and on the ears traits, according to the CONABIO guidelines. In this area maize is usually grown during the Spring-Summer period, and using little technology, without fertilization or pest control. The 40 accessions correspond to seven races and seven interracial crosses. The most frequent maize races were Ratón and Cónico Norteño, especially in dry areas with little rain. Races Celaya, Tablilla de Ocho and Elotes Cónicos found in this study, had not been previously reported; but the Tabloncillo and Olotillo races that had previously been reported were no longer found. Three collections stood out for producing large ears with large kernels, thus having a high yield potential. Native maize harvested in dryland areas might offer advantages to be grown under harsh environments.Objective: To analyze the race diversity and geographic distribution of the native maize landraces currently cropped at southern Nuevo León, México. Design/Methodology/Approach: Data was obtained from 41 accessions which represent the commercial production in the dry land area, where fertilization and pest control are scarcely used. Landraces were classified according to the CONABIO guidelines for ear traits. Results: The measured accessions correspond to seven maize races and to seven interracial crosses. The two most frequent maize races were Ratón and Cónico Norteño, mostly located in the dry areas with less rain. Study Limitations/Implications: Three races, Celaya, Tablilla de Ocho and Elotes Cónicos, had not been previously reported; while two formerly reported races Tabloncillo and Olotillo, were no longer found. This study did not include the grain-colored accessions. Findings/Conclusions: Three collections stood out for producing large ears with large kernels, thus showing a high yield potential. The maize landraces harvested in dryland areas might offer advantages to be grown under harsh environments or be used as gene donors for drought tolerance

Model for the Peptide-Free Conformation of Class II MHC Proteins

Background: Major histocompatibility complex proteins are believed to undergo significant conformational changes concomitant with peptide binding, but structural characterization of these changes has remained elusive. Methodology/Principal Findings: Here we use molecular dynamics simulations and experimental probes of protein conformation to investigate the peptide-free state of class II MHC proteins. Upon computational removal of the bound peptide from HLA-DR1-peptide complex, the a50-59 region folded into the P1-P4 region of the peptide binding site, adopting the same conformation as a bound peptide. Strikingly, the structure of the hydrophobic P1 pocket is maintained by engagement of the side chain of Phe a54. In addition, conserved hydrogen bonds observed in crystal structures between the peptide backbone and numerous MHC side chains are maintained between the a51-55 region and the rest of the molecule. The model for the peptide-free conformation was evaluated using conformationally-sensitive antibody and superantigen probes predicted to show no change, moderate change, or dramatic changes in their interaction with peptide-free DR1 and peptide-loaded DR1. The binding observed for these probes is in agreement with the movements predicted by the model. Conclusion/Significance: This work presents a molecular model for peptide-free class II MHC proteins that can help to interpret the conformational changes known to occur within the protein during peptide binding and release, and ca

Fast Control Systems: Nonlinear Approach

International audienceThis chapter treats the problem of fast control design for nonlinear systems. First, we discusses the question: which nonlinear system can be called fast? Next, we develop some tools for analysis and design of such control systems. The method generalized homogeneity is mainly utilized for these purposes. Finally, we survey possible research directions of the fast control systems