Translational and post-translational regulation of polyamine metabolic enzymes in plants.

Polyamines are small organic and basic polycations that perform essential regulatory functions in all living organisms. Fluctuations in polyamine content have been observed to occur during growth, development and under stress conditions, implying that polyamines play pivotal roles in diverse cellular and physiological processes. To achieve polyamine homeostasis, the entire metabolic pathway is subjected to a fine-tuned regulation of its biosynthetic and catabolic genes and enzymes. In this review, we describe and discuss the most important mechanisms implicated in the translational and post-translational regulation of polyamine metabolic enzymes in plants. At the translational level, we emphasize the role of polyamines in the modulation of upstream open reading frame (uORF) activities that control the translation of polyamine biosynthetic and catabolic mRNAs. At the post-translational level, different aspects of the regulation of polyamine metabolic proteins are depicted, such as the proteolytic activation of enzyme precursors, the importance of dimerization in protein stability as well as in protein intracellular localization.

Hematoma cerebral agudo en la evolución de una encefalitis por virus herpes simple tipo 1. Una complicación infrecuente / Acute cerebral haematoma in the course of herpes simplex 1 encephalitis. A rare complication

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Morphological and morphometric characterization of the "sphenoidal tubercle" / Caracterización morfológica y morfométrica del tubérculo esfenoidal

The sphenoidal tubercle is a bone elevation located in the anterior edge of the infratemporal crest of the sphenoid greater wing, where the temporal and lateral pterygoid muscles have their origin. This bone accident presents varied morphology so its description and denomination are a topic of discussion. 60 dry skulls obtained from the morphology laboratory of the Biomedical Basic Sciences Department of the University of Talca were used for a morphological and morphometric analysis of the sphenoidal tubercle including its morphology, diameters (anteroposterior, transverse and vertical) and the distance to the grooves for the maxillary artery and maxillary nerve. Sphenoidal tubercle had a prevalence of 98.4 % of all dry skulls analyzed with a bilateral presentation in the 76.6 % of the cases. According to its different forms of presentation established by Cáceres et al., (2016) the pyramidal form was the most frequent with a 25.7 %. The average diameters were of 4.12 mm anteroposterior, 5.50 mm transverse and 3.89 mm vertical. The average distance to the grooves of the maxillary artery and maxillary nerve were 9.04 mm and 7.6 mm, respectively. Sphenoidal tubercle is a constant bone accident with a variated morphology and measures. Due to its anatomical relations with important neurovascular elements such as the maxillary artery and the maxillary nerve, it may be used as a reference point for surgical access to the infratemporal fossa. From this analysis we establish that the denomination of "infratemporal process" is more accurate, because the development of this bone accident is from muscular traction performed by the lateral pterygoid muscle and the deep portion of the temporal muscle causing great variations in its morphology, probably due to external and functional parameters or even influenced by the biotype.

El tubérculo esfenoidal es una elevación ósea ubicada en el extremo anterior de la cresta infratemporal del ala mayor del hueso esfenoides, donde presta inserción al músculo temporal y pterigoideo lateral. Presenta morfología variada, por lo que su descripción y denominación resultan motivo de discusión. 60 cráneos secos obtenidos del Laboratorio de Morfología del Departamento de Ciencias Básicas Biomédicas de la Universidad de Talca, fueron utilizados para realizar un análisis morfológico y morfométrico del tubérculo esfenoidal evaluando forma, diámetros (anteroposterior, laterolateral y vertical) y distancia con el surco de la arteria y nervio maxilar. El tubérculo esfenoidal tuvo una prevalencia del 98,4 % del total de cráneos analizados, presentándose bilateralmente en el 76,6 % de los casos. De acuerdo a las diferentes formas de presentación establecidas por Cáceres et al (2016) la forma piramidal fue la más frecuente con un 25,7 %. Los diámetros promedio fueron de 4,12 mm anteroposterior, 5,50 mm laterolateral y 3,89 mm vertical. Las distancias promedio con el surco de la arteria y nervio maxilar fueron de 9,04 mm y 7,6mm, respectivamente. El tubérculo esfenoidal es un accidente óseo constante de morfología y dimensiones variadas. Debido a sus relaciones con elementos vasculares de importancia, tales como la arteria y nervio maxilar, podría ser utilizado como elemento de referencia para el acceso quirúrgico a la fosa infratemporal. A partir de su análisis planteamos que su denominación como "proceso infratemporal" sería más apropiado, debido a que se desarrollaría a partir de la tracción muscular ejercida por el musculo pterigoideo lateral y la porción profunda del músculo temporal, ocasionando variaciones notables en su morfología, probablemente debido a factores externos y funcionales o incluso influenciada por el biotipo.

The tumor suppressor phosphatase and tensin homolog protein (PTEN) is negatively regulated by NF-κb p50 homodimers and involves histone 3 methylation/deacetylation in UROtsa cells chronically exposed to monomethylarsonous acid.

UROtsa cells have been accepted as a model to study carcinogenicity mechanisms of arsenic-associated human bladder cancer. In vitro continuous exposure to monomethylarsonous acid (MMAIII), leads UROtsa cells to commit to malignant transformation. In this process, NF-κß-associated inflammatory response seems to play an important role since this transcription factor activates some minutes after cells are exposed in vitro to MMAIII and keeps activated during the cellular malignant transformation. It is known that a slight decrease in the protein phosphatase and tensin homologue (PTEN) gene expression is enough for some cells to become malignantly transformed. Interestingly, this tumor suppressor has been proven to be negatively regulated by NF-κß through binding to its gene promoter. Based on these observations we propose that NF-κß may be involved in arsenic associated carcinogenesis through the negative regulation of PTEN gene expression. Changes in PTEN expression and the binding of p50 NF-κß subunit to PTEN promoter were evaluated in UROtsa cells exposed for 4, 12, 20, or 24 wk to 50nM MMAIII. Results showed that MMAIII induced a significant decrease in PTEN expression around 20 wk exposure to MMAIII,which correlated with increased binding of p50 subunit to the PTEN promoter. Consistent with these results, ChIP assays also showed a significant decrease in H3 acetylation (H3ac) but an increase in the repression marks H3k9me3 and H327me3 in PTEN promoter when compared with not treated cells. These results suggest that the activation of NF-κß by MMAIII may participate in UROtsa cells malignant transformation through the negative regulation of PTEN expression involving p50 homodimers-mediated chromatin remodeling around the PTEN promoter.

Effect of ciprofloxacin antibiotic on the partial-nitritation process and bacterial community structure of a submerged biofilter.

A partial-nitritation bench-scale submerged biofilter was used for the treatment of synthetic wastewater containing a high concentration of ammonium in order to study the influence of the antibiotic ciprofloxacin on the partial-nitritation process and biodiversity of the bacterial community structure. The influence of ciprofloxacin was evaluated in four partial-nitritation bioreactors working in parallel, which received sterile synthetic wastewater amended with 350 ng/L of ciprofloxacin (Experiment 1), synthetic wastewater without ciprofloxacin (Experiment 2), synthetic wastewater amended with 100 ng/L of ciprofloxacin (Experiment 3) and synthetic wastewater amended with 350 ng/L of ciprofloxacin (Experiment 4). The concentration of 100 ng/L of antibiotics demonstrated that the partial-nitritation process, microbial biomass and bacterial structure generated by tag-pyrosequencing adapted progressively to the conditions in the bioreactor. However, high concentrations of ciprofloxacin (350 ng/L) induced a decay of the partial-nitritation process, while the total microbial biomass was increased. Within the same experiment, the bacterial community experienced sequential shifts with a clear reduction of the ammonium oxidation bacteria (AOB) and an evident increase of Commamonas sp., which have been previously reported to be ciprofloxacin-resistant. Our study suggests the need for careful monitoring of the concentration of antibiotics such as ciprofloxacin in partial-nitritation bioreactors, in order to choose and maintain the most appropriate conditions for the proper operation of the system.

Tratamiento endovascular de estenosis intracraneales sintomáticas: resultados a corto y largo plazo de un único centro / Endovascular treatment of symptomatic intracranial stenoses: short- and long-term results in a single center

Objetivos. Presentamos los resultados a corto y largo plazo de una serie de pacientes con estenosis arteriales intracraneales (EAIC) sintomáticas tratados en nuestro centro mediante angioplastia y endoprótesis. Material y métodos. Revisión de pacientes con estenosis intracraneales > 50% sintomáticas tratados en nuestro centro mediante angioplastia y/o colocación de endoprótesis. Se recogieron los datos demográficos y los factores de riesgo vascular (hipertensión, diabetes, dislipemia, cardiopatía isquémica). Todas las lesiones tratadas se caracterizaron por su localización, grado y longitud de la estenosis. El grado de estenosis se calificó como moderado (50-70%) o grave (> 70%). En el seguimiento se evaluaron los accidentes cerebrovasculares, episodios de cardiopatía isquémica o fallecimientos ocurridos durante los 30 primeros días y en el seguimiento posterior. Resultados. Entre 2006 y 2010 se trataron 26 pacientes (21 varones y 5 mujeres) con edades comprendidas entre 44 y 79 años (media: 63 años), con 29 lesiones intracraneales. El procedimiento endovascular se realizó con éxito (angioplastia + endoprótesis) en 23 casos (92,0%). En los 30 primeros días postintervención se produjeron tres (11,5%) efectos adversos de origen vascular: un ictus, una hemorragia y un fallecimiento por trombosis de la endoprótesis. El seguimiento a largo plazo se ha realizado sobre 25 pacientes (5-46 meses). No se han detectado recurrencias de la sintomatología. Conclusión. El tratamiento endovascular de las EAIC es técnicamente factible. Las complicaciones del procedimiento a corto plazo tienen una prevalencia alta. No se ha detectado recurrencia de la sintomatología a largo plazo(AU)

Objectives. We present the short- and long-term results of a series of patients with symptomatic intracranial arterial stenoses treated with angioplasty and stenting. Material and methods. We reviewed patients with symptomatic intracranial stenoses greater than 50% who were treated with angioplasty, stenting, or both. We recorded demographic data and risk factors (hypertension, diabetes, dyslipemia, ischemic heart disease). We classified all lesions treated according to their location, degree of stenosis, and length. The degree of stenosis was classified as moderate (50%-70%) or severe (>70%). In the follow-up, we assessed cerebrovascular accidents, episodes of ischemic heart disease, and deaths in the first 30 days and in later follow-up. Results. Between 2006 and 2010, we treated 26 patients (21 men and 5 women; age range, 44-79 years; mean age, 63 years) with 29 intracranial lesions. The endovascular procedure (angioplasty + stenting) was successfully performed in 23 cases (92.0%). In the first 30 days after the procedure, 3 (11.5%) patients had adverse effects of vascular origin: 1 stroke, 1 hemorrhage, and 1 death due to thrombosis of the stent. Long-term follow-up (5-46 months) in the 25 patients who survived more than 30 days detected no recurrence of symptoms. Conclusion. Endovascular treatment of intracranial stenosis is technically feasible. Short-term complications are highly prevalent. No recurrence of symptoms was detected during long-term follow-up(AU)

[Endovascular treatment of symptomatic intracranial stenoses: short- and long-term results in a single center]. / Tratamiento endovascular de estenosis intracraneales sintomáticas: resultados a corto y largo plazo de un único centro.

OBJECTIVES: We present the short- and long-term results of a series of patients with symptomatic intracranial arterial stenoses treated with angioplasty and stenting. MATERIAL AND METHODS: We reviewed patients with symptomatic intracranial stenoses greater than 50% who were treated with angioplasty, stenting, or both. We recorded demographic data and risk factors (hypertension, diabetes, dyslipemia, ischemic heart disease). We classified all lesions treated according to their location, degree of stenosis, and length. The degree of stenosis was classified as moderate (50%-70%) or severe (>70%). In the follow-up, we assessed cerebrovascular accidents, episodes of ischemic heart disease, and deaths in the first 30 days and in later follow-up. RESULTS: Between 2006 and 2010, we treated 26 patients (21 men and 5 women; age range, 44-79 years; mean age, 63 years) with 29 intracranial lesions. The endovascular procedure (angioplasty+stenting) was successfully performed in 23 cases (92.0%). In the first 30 days after the procedure, 3 (11.5%) patients had adverse effects of vascular origin: 1 stroke, 1 hemorrhage, and 1 death due to thrombosis of the stent. Long-term follow-up (5-46 months) in the 25 patients who survived more than 30 days detected no recurrence of symptoms. CONCLUSION: Endovascular treatment of intracranial stenosis is technically feasible. Short-term complications are highly prevalent. No recurrence of symptoms was detected during long-term follow-up.

Dietary glycaemic load and odds of depression in a group of institutionalized elderly people without antidepressant treatment.

BACKGROUND: Depression is a very common disorder in elderly, especially in those institutionalized. Nutrition could play an important role in the onset and/or progression of depression, since the intake of carbohydrates with a high glycaemic index (GI) or diets with a high glycaemic load (GL) may increase the insulin-induced brain serotonin secretion. OBJECTIVE: The aim of our study was to analyse the association between dietary GI and GL and the odds of suffering depression in institutionalized elderly people without antidepressant treatment. METHODS: This cross-sectional study included 140 institutionalized elderly people from the Madrid region (Spain) (65-90 years of age) whose diets were recorded using a precise weighing method over seven consecutive days. Energy and nutrient intakes were recorded and the GI and GL calculated. The participants' affective capacity was assessed using the Geriatric Depression Scale (GDS). Subjects were grouped into non-depressed (GDS ≤ 5) and depressed (GDS > 5). Since GDS scores and gender were statistically associated (p < 0.01), the data were grouped considering this association. RESULTS: Dietary GI (51.09 ± 3.80) and GL (97.54 ± 13.46) were considered as medium. The dietary GL was significantly higher in the non-depressed (100.00 ± 12.13) compared with the depressed group (93.97 ± 14.04, p < 0.01). However, a similar GI was observed between non-depressed (51.50 ± 3.29) and depressed groups (50.52 ± 4.46). Additionally, participants with a dietary GL placed in the second and third tertiles had a 67.4 % and 65.3 %, respectively, less odds of suffering depression than those in the first tertile. GDS scores and dietary GL were inversely related; therefore, an increase in one unit in the dietary GL scale decreased the GDS score by 0.058 units. CONCLUSIONS: Glyaemic load is associated with a lower odd of depression.

Validation and comparison of microsatellite markers derived from Senegalese sole (Solea senegalensis, Kaup) genomic and expressed sequence tags libraries.

In this work, we tested 100 potential new microsatellites (SSRs) equally derived from expressed sequence tag (EST) and enriched genomic-DNA libraries from Senegalese sole (Solea senegalensis, Kaup), a valuable cultured flatfish species. A final set of 69 new polymorphic microsatellites were validated after a population analysis, 37 of which corresponded to the first EST library constructed for Senegalese sole (EST-SSR). Although differences were not significant, EST sequences provided a higher proportion of quality markers (74%) than anonymous ones (64%). Most of the rejected anonymous SSRs (17 loci) were discarded because they did not generate PCR products; only one was monomorphic. On the contrary, all EST-SSRs gave PCR products, although monomorphism was more frequent (26%). Altogether, the number of alleles per locus was fairly similar in both SSR types, ranging from 2 to 19. The observed and expected heterozygosities varied from 0.105 to 1 and from 0.108 to 0.937, respectively. The main difference between the two sets was the percentage of annotated loci, being higher in EST-SSRs, as expected. Within the EST-SSRs, 46% of them showed flanking regions that significantly matched with EST sequences from other three flatfish species; however, the microsatellite itself was present only on half of these cases. These two new SSR sets constitute a suitable tool for fingerprinting, gene flow, genetic diversity, genome mapping studies and molecular-assisted breeding in this species.

Exploitation of a turbot (Scophthalmus maximus L.) immune-related expressed sequence tag (EST) database for microsatellite screening and validation.

In this study, we identified and characterized 160 microsatellite loci from an expressed sequence tag (EST) database generated from immune-related organs of turbot (Scophthalmus maximus). A final set of 83 new polymorphic microsatellites were validated after the analysis of 40 individuals of Atlantic origin including both wild and farmed individuals. The allele number and the expected heterozygosity ranged from 2 to 18 and from 0.021 to 0.951, respectively. Evidences of null alleles at moderate-high frequencies were detected at six loci using population data. None of the analysed loci showed deviations from Mendelian segregation after the analysis of five full-sib families including approximately 92 individuals/family. The markers are used to consolidate the turbot genetic map, and because they are mostly EST-derived, they will be very useful for comparative genomic studies within flatfishes and with model fish species. Using an in silico approach, we detected significant homologies of microsatellite sequences with the EST databases of the flatfish species with highest genomic resources (Senegalese sole, Atlantic halibut, bastard halibut) in 31% of these turbot markers. The conservation of these microsatellites within Pleuronectiformes will pave the way for anchoring genetic maps of different species and identifying genomic regions related to productive traits.

[Horner syndrome as a manifestation of carotid artery dissection]. / Síndrome de Horner como manifestación de disección carotídea.

CLINICAL CASE: A 42-year-old man presented with ptosis and miosis in his left eye and a history of headache over the last 20 days. An angioresonance showed dissection of internal carotid artery. DISCUSSION: "Painful Horner's Syndrome" is considered to be a medical emergency due possible onset of an internal carotid artery dissection. We consider that awareness of neuro-ophthalmologic emergencies is very important in the clinical praxis of an ophthalmologist. Multidisciplinary treatment and follow-up of these patients is required.

Síndrome de Horner como manifestación de disección carotídea / Horner syndrome as a manifestation of carotid artery dissection

Caso Clínico: Un varón de 42 años se presenta con ptosisymiosis izquierda después de una historia de cefalea homolateral de 20 días de evolución, que empeora progresivamente durante los últimos días. Una angioresonancia revela disección de la arteria carótida interna. Discusión: El «síndrome de Horner doloroso» destaca como una urgencia médica por posible manifestación de una disección carotídea. Consideramos que el perfecto conocimiento de las urgencias neurooftalmológicas es de gran necesidad para el médico oftalmólogo y que estas requieren una atención multidisciplinaria para asegurar un seguimiento y tratamiento adecuado(AU)

Clinical Case: A 42-year-old man presented with ptosis and miosis in his left eye and a history of headache over the last 20 days. An angioresonance showed dissection of internal carotid artery. Discussion: “Painful Horner‘s Syndrome” is considered to be a medical emergency due possible on set of an internal carotid artery dissection. We consider that awareness of neuro-ophthalmologic emergencies is very important in the clinical praxis of an ophthalmologist. Multidisciplinary treatment and follow-up of these patients is required(AU)

Evolución a largo plazo de la estenosis carotídea tratada endovascularmente: estudio prospectivo en una unidad neurovascular / Long-term development of carotid stenosis treated by endovascular means: a prospective study in a neurovascular unit

Objetivo. Aun hoy, a diferencia de la endarterectomía, la evolución a largo plazo en la angioplastia carotídea no está bien definida. El objetivo es describir la evolución a corto y largo plazo y la tasa de reestenosis de una serie consecutiva de pacientes con estenosis de carótida sometidos a tratamiento endovascular en el Hospital Universitario La Fe, diferenciando entre pacientes con y sin síntomas. Pacientes y métodos. Desde 1999 hasta 2010 se incluyeron 426 pacientes a los que se les realizó angioplastia carotídea (el 25,5% eran pacientes asintomáticos). Se llevó a cabo seguimiento clínico a 374 pacientes. Fueron visitados anualmente, y cada año se les realizó estudio neurosonológico. Se recogieron las complicaciones durante los 30 primeros días y las complicaciones a largo plazo; se recogió la tasa de reestenosis en el seguimiento y se valoraron las posibles diferencias entre pacientes con y sin síntomas. Resultados. La morbimortalidad en el primer mes fue del 4,2% (4,4% en pacientes sintomáticos y 3,8% en pacientes asintomáticos). El seguimiento medio fue de 55 meses: un 8% de pacientes presentó ictus, un 11% sufrió un infarto de miocardio y un 24,3% falleció, sin diferencias significativas entre los pacientes con y sin síntomas. La tasa de reestenosis fue del 17,3% a los cinco años, un 7,5% igual o superior al 50%, y de ellas, en el 1,1% fueron sintomáticas. Cinco pacientes con reestenosis significativa fueron tratados con éxito con técnicas endovasculares. Conclusiones. La angioplastia carotídea es una técnica efectiva y segura en manos experimentadas; nuestros resultados son buenos, tanto a corto como a largo plazo, con una baja tasa de reestenosis. En caso de producirse esta última, el intervencionismo vascular es seguro y eficaz (AU)

Aims. Even today, unlike endarterectomy, long-term development in carotid angioplasty has still not been well defined. The aim of this study is to describe both the short- and long-term development and the rate of restenosis in a consecutive series of patients with carotid stenosis who underwent endovascular treatment at the Hospital Universitario La Fe; a distinction is made between patients with and without symptoms. Patients and methods. From 1999 to 2010, 426 patients were submitted to a carotid angioplasty (25.5% were asymptomatic patients). Clinical follow-ups were conducted in the case of 374 patients. They had annual check-ups and every year a neurosonological study was performed. The aim was to determine what complications occurred during the first 30 days, as well as the long-term complications, to establish the rate of restenosis and to evaluate possible differences between patients with and without symptoms. Results. The morbidity and mortality rate in the first month was 4.2% (4.4% in symptomatic patients and 3.8% in asymptomatic patients). The mean follow-up time was 55 months: 8% of patients presented strokes, 11% suffered from myocardial infarct and 24.3% died, with no significant differences between patients with or without symptoms. The rate of restenosis was 17.3% at five years, 7.5% equal to or above 50% and, of those, 1.1% were symptomatic. Five patients with significant restenosis were successfully treated with endovascular techniques. Conclusions. Carotid angioplasty is an effective, safe technique in the hands of an experienced professional; our findings are good, both in the short and the long term, with a low rate of restenosis. If this latter condition occurs, vascular intervention techniques are safe and efficient (AU)

Búsqueda prenatal de bloqueo aurículo ventricular congénito en población de riesgo: experiencia Universidad Católica de Chile / Congenital heart block in risk population: Universidad Catolica de Chile experience

Congenital heart block is a fetal arrhythmia detected by routine prenatal ultrasound. Natural history and risk factors for this condition are known. Patients having Ro/La antibodies have 2 to 4 percent risk of affected child and recurrence of up to 25 percent. There are standarized protocols for measuring the PR interval by ultrasound, as well as reference curves for different gestational ages. The experience at Hospital Clínico de la Universidad Católica de Chile is reported, describing follow up of 37 patients over a period of more than 4 years. A protocol based on monthly monitoring of risk group was adopted.

El bloqueo aurículo ventricular congénito constituye una de las arritmias fetales detectables mediante ultrasonido prenatal de rutina. Se conoce su evolución natural y la población de riesgo de sufrir esta afección. En portadoras de anticuerpos Ro/La el riesgo de un hijo afectado es entre 2 y 4 por ciento, y la recurrencia de hasta un 25 por ciento. Existen protocolos estandarizados para medir el intervalo PR mediante ultrasonido, como también curvas de referencia para las distintas edades gestacionales. Reportamos la experiencia en el Hospital Clínico de la Universidad Católica de Chile, con un seguimiento de 37 pacientes en un periodo de más de 4 años. Se adoptó un protocolo de seguimiento mensual del grupo de riesgo.

Predicting aneuploidy in human oocytes: key factors which affect the meiotic process.

BACKGROUND: To estimate the incidence of aneuploidy in relation to patients' characteristics, the type of hormonal stimulation and their response to induction of multiple follicular growth, 4163 first polar bodies (PB1s) were analyzed. METHODS: Five hundred and forty four infertile couples underwent 706 assisted conception cycles (640 with poor prognosis indications and 66 controls) in which chromosomal analysis of PB1 for the chromosomes 13, 15, 16, 18, 21 and 22 was performed. Results were evaluated in a multivariate analysis. RESULTS: The proportion of normal oocytes was directly correlated (P < 0.01) with (i) the number of mature oocytes and (ii) the establishment of a clinical pregnancy; and inversely correlated (P < 0.01) with (i) female age, (ii) causes of female infertility (endometriosis, abortions, ovulatory factor), (iii) poor prognosis indications (female age, number of previous cycles, multiple poor prognosis indications), (iv) number of FSH units per oocyte and (v) number of FSH units per metaphase II oocyte. There was a weak significance of frequency (P < 0.05) between type of abnormality (originated by chromatid predivision, chromosome non-disjunction or combined mechanisms in the same oocyte) and groups of the studied variables, rather than to a specific abnormality or a specific chromosome. CONCLUSIONS: The type of infertility had a significant effect on errors derived from the first meiotic division, whose incidence was significantly higher in the presence of endometriosis or of an ovulatory factor, and in women that experienced repeated abortions. Each aneuploidy event was found to be dependent not on a specific variable, but on groups of variables. In addition, the tendency of chromosomal abnormalities to occur simultaneously implies that the deriving aneuploidies can be of any type.

La opción sexual como tema de conflicto en la sala de diálisis / No disponible

No disponible

Start-up procedures and analysis of heavy metals inhibition on methanogenic activity in EGSB reactor.

The effectiveness of operating an industrial UASB reactor, treating wastewater from the beer industry, with flows containing heavy metals was evaluated. A pilot-scale UASB reactor, already used to simulate the industrial reactor, was unsuccessfully employed. An easy start-up was obtained arranging it as an EGSB reactor. Considerations about this modification are reported. The effects of Cu(II), Ni(II) and Cr(III) ions on the anaerobic activity were analyzed by measurements of methane production rate and COD removal. The employed biomass was the sludge of the industrial UASB reactor, while a solution of ethanol and sodium acetate with COD of 3000 mg/L and a heavy metal concentration of 50 mg/L were continuously fed. Experimental results proved higher biomass sensitivity for copper and much slighter for nickel and chromium. Moreover, copper inhibition has been demonstrated to be less significant if a metal-free feed was provided to the system before copper addition.

The centromeric satellite of the wedge sole (Dicologoglossa cuneata, Pleuronectiformes) is composed mainly of a sequence motif conserved in other vertebrate centromeric DNAs.

Here, a new satellite-DNA family is isolated and characterized from wedge sole, Dicologoglossa cuneata Moreau, 1881 (Pleuronectiformes), a fish having a small genome. This satellite-DNA family of sequences was isolated by conventional cloning after digestion of genomic DNA with the DraI restriction enzyme. Repeat units are 171 bp in length with a high AT content (63%). Several runs of consecutive adenines and thymines were found, and concomitantly computer analyses revealed that these regions are prone to acquire stable sequence-directed curvature. Especially remarkable is that the DraI sequences are composed almost entirely of the repetition of up to fourteen 9-bp motifs (T/C)GTC(A/C)AAAA similar to other vertebrate centromeric satellite-DNA sequences. In fact, we demonstrate the origin of this satellite through duplication of this motif plus the addition of a stretch of cytosines. The centromeric location and the presence in this satellite-DNA sequence of not only different vertebrate motifs (CENP-B box, pJalpha) but also others such as the CDEIII motif of Saccharomyces cerevisiae reveal a possible role in centromere function. All these characteristics provide important information on the origin, function, and the evolution of the centromeric satellite DNAs in wedge sole.

Abdominal cerebrospinal fluid pseudocyst: a complication of ventriculoperitoneal shunts in adults.

Abdominal cerebrospinal fluid pseudocyst is an uncommon complication of using ventriculoperitoneal shunt (VPS). Although many cases have been reported in children, abdominal pseudocysts are rare in adult patients. The purpose of this article is to describe and illustrate the findings for this condition on commonly used abdominal diagnostic imaging modalities. This is a retrospective review of the six adult patients diagnosed with abdominal pseudocyst as a consequence of VPS at our centre from 1995 to 2006. We reviewed patients' prior history, cerebral and abdominal clinical manifestations, imaging findings, treatment and evolution. All patients presented with pain and abdominal distension associated with the presence of a palpable mass. Plain-film radiography was carried out in one patient, ultrasound in three and CT in all six. A fluid collection close to or associated to the VPS catheter was observed in all cases. Visualization of the distal tip of the VPS within a homogeneous intraperitoneal collection is the principal diagnostic sign of an abdominal cerebrospinal fluid pseudocyst at ultrasound and CT.