Examining nervios among immigrant male farmworkers in the MICASA Study: sociodemographics, housing conditions and psychosocial factors.

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O'Connor, Kathleen; Stoecklin-Marois, Maria; Schenker, Marc B

2015-02-01

Nervios is a culturally defined condition of psychological stress with important implications for Latino health. Using epidemiological research methods, we examined the prevalence of nervios and associated risk factors, including drug and alcohol use, acculturation, and housing conditions in a population-based study of farm worker families in Mendota, CA (the MICASA Study). A household enumeration procedure was used for sampling, and 843 individuals were interviewed in 2006-2007. In this analysis, we present data on 422 men, 381 accompanied (family) males and 41 unaccompanied males. The prevalence of nervios was 22%, with no difference in prevalence by household status. Low family incomes, drug use, medium/high acculturation, and poor housing conditions were associated with increased odds of nervios. Self-reported poor/fair health, depressive symptoms, and high perceived stress were also associated with nervios. Since nervios has been shown to be a clinical indicator of psychiatric vulnerability among Latinos, this analysis furthers public health goals of reducing health disparities.

Subtypes of ataques de nervios: the influence of coexisting psychiatric diagnosis.

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Salmán, E; Liebowitz, M R; Guarnaccia, P J; Jusino, C M; Garfinkel, R; Street, L; Cárdenas, D L; Silvestre, J; Fyer, A J; Carrasco, J L; Davies, S O; Klein, D F

1998-06-01

The current study assesses the relationship between presenting symptomatology of the self-labeled Hispanic popular diagnosis of ataques de nervios and the specific co-morbid psychiatric diagnoses. Hispanic subjects seeking treatment at an anxiety disorders clinic (n = 156) were assessed with a specially designed self-report instrument for both traditional ataque de nervios and panic symptoms, and with structured or semistructured psychiatric interviews for Axis-I disorders. This report focuses on 102 subjects with ataque de nervios who also met criteria for panic disorder, other anxiety disorders, or an affective disorder. Distinct ataque symptom patterns correlated with co-existing panic disorder, affective disorders, or other anxiety disorders. Individuals with both ataque and panic disorder reported the most asphyxia, fear of dying, and increased fear during their ataques. People with ataques who also met criteria for affective disorder reported the most anger, screaming, becoming aggressive, and breaking things during ataques. Ataque positive subjects with other anxiety disorders were less salient for both panic-like and emotional-anger symptoms. The findings suggest that (a) ataque de nervios is a popular label referring to several distinct patterns of loss of emotional control, (b) the type of loss of emotional control is influenced by the associated psychiatric disorder, and (c) ataque symptom patterns may be a useful clinical marker for detecting psychiatric disorders. Further study is needed to examine the relationship between ataque de nervios and psychiatric disorders, as well as the relationship to cultural, demographic, environmental, and personality factors.

A Quantitative Analysis of "Ataque de Nervios" in Puerto Rico: Further Examination of a Cultural Syndrome

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Febo San Miguel, Vivian E.; Guarnaccia, Peter J.; Shrout, Patrick E.; Lewis-Fernandez, Roberto; Canino, Glorisa J.; Ramirez, Rafael R.

2006-01-01

The authors present a quantitative analysis and assessment of the symptoms of "ataque de nervios." A sample of 121 individuals living in Puerto Rico provided qualitative and structured data on "ataques de nervios" and psychiatric correlates. A total of 77 participants reported having an "ataque de nervios" during…

Ataques de nervios in Puerto Rico: culture-bound syndrome or popular illness?

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Guarnaccia, P J

1993-04-01

Ataque de nervious is a popular illness category among Puerto Ricans and other Latinos written about in anthropological and psychiatric literature for over thirty years. This paper discusses the issue of categorizing ataque de nervios as a "culture-bound syndrome" using data from the first community-based study of this phenomena using epidemiological methods. The paper summarizes the social and psychological correlates of ataques de nervios and provides a preliminary overview of the situations which provoke ataques and the symptoms people experience. The paper critically examines the use of the "culture-bound syndrome" framework analyzing ataques de nervios and suggests that the term "popular illness" is a more effective label for categorizing this syndrome.

Ataque de nervios and history of childhood trauma.

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Schechter, D S; Marshall, R; Salmán, E; Goetz, D; Davies, S; Liebowitz, M R

2000-07-01

Ataque de nervios is a common, self-labeled Hispanic folk diagnosis. It typically describes episodic, dramatic outbursts of negative emotion in response to a stressor, sometimes involving destructive behavior. Dissociation and affective dysregulation during such episodes suggested a link to childhood trauma. We therefore assessed psychiatric diagnoses, history of ataque, and childhood trauma in treatment-seeking Hispanic outpatients (N = 70). Significantly more subjects with an anxiety or affective disorder plus ataque reported a history of physical abuse, sexual abuse, and/or or a substance-abusing caretaker than those with psychiatric disorder but no ataque. In some Hispanic individuals, ataque may represent a culturally sanctioned expression of extreme affect dysregulation associated with childhood trauma. Patients with ataque de nervios should receive a thorough traumatic history assessment.

Estudio anatómico de la rama superficial del nervio radial, implicaciones quirúrgicas

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Enrique Vergara Amador

2010-07-01

Full Text Available Antecedentes. Conocer la anatomía de la rama superficial del nervio radial, es indispensable para la adecuada práctica de cirugías que involucran la mano y la muñeca. Objetivo. Determinar las relaciones del nervio radial y sus ramas con el tubérculo de Lister, la apófisis estiloides del radio y la distribución en el dorso de la mano. Material y métodos. Se disecaron 25 piezas de cadáveres frescos. Se identificó la rama superficial del nervio radial y se midió la distancia entre la salida del nervio y la apófisis estiloides del radio. Se identificaron las ramas del nervio en el antebrazo distal y en la muñeca y se midieron respecto a la apófisis estiloides y al tubérculo de Lister. Resultados. La rama superficial del nervio radial emergió en la región dorsal y radial del tercio distal del antebrazo entre el músculo braquiradialis y el extensor carpis radialis longus, a una distancia de 8,45 cm proximal a la apófisis estiloides. Su primera rama de división discurrió palmar a la apófisis estiloides radial a una distancia promedio de 0,74 cm respecto a la misma. El tronco principal se dividió en varias ramas terminales así: proximal a la apófisis estiloides del radio (28%, a nivel de la misma (12% y distal (60%. El patrón de distribución de las ramas nerviosas en la base de los dedos más frecuente fue el del primero, segundo y el lado radial del tercer dedo (56%. Discusión. Este estudio mostró la gran variabilidad de la rama superficial del nervio radial en el dorso de la mano y la alta probabilidad de daño del mismo durante los procedimientos abiertos, artroscópicos o procedimientos percutáneos en la muñeca.

The burden of responsibility: duty, depression, and nervios in Andean Ecuador.

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Finerman, R

1989-01-01

Saraguro Indian women possess relatively high status in their community. Nevertheless, they experience high rates of the culturally interpreted illness nervios. This syndrome produces symptoms characteristic of stress-induced depression and is identified by Saraguros as the product of suffering and misfortune. Descriptive and quantitative interview data indicate that episodes of nervios correlate with experiences of gender role failure, and the condition is identified as a coping mechanism for excessive responsibility and unrealistic social expectation. This syndrome also appears to serve as an effective strategy for enhancing power and social status.

Differential diagnosis of ataque de nervios.

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Oquendo, M A

1995-01-01

Characteristics of ataque de nervios, a culturally condoned expression of distress that is most frequently seen in Hispanic women, are described. It has symptoms in common with affective and anxiety disorders, with which it can co-occur, and these are delineated for purposes of differential diagnosis. Possible reasons for the preponderance of the condition in women are discussed, along with suggested intervention strategies.

Beyond anxious predisposition: do padecer de nervios and ataque de nervios add incremental validity to predictions of current distress among Mexican mothers?

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Alcántara, Carmela; Abelson, James L; Gone, Joseph P

2012-01-01

Nervios (PNRV) and ataque de nervios (ATQ) are culture-bound syndromes with overlapping symptoms of anxiety, depression, and dissociation, shown to have inconsistent associations to psychiatric disorder. Few studies test the basic assumption that PNRV and ATQ are uniformly linked to distress outcomes across Latina/o immigrant groups. This study examined: (a) the extent to which acculturative stress, Latino/US American acculturation, and anxious predisposition were associated with lifetime history of ATQ and PNRV, and (b) the extent to which ATQ and PNRV add incremental validity in explaining acculturative stress and psychological distress beyond measures of anxious predisposition. Participants (n = 82) included Mexican mothers who completed surveys on acculturation, trait anxiety, anxiety sensitivity, lifetime ATQ/PNRV, psychological distress, and acculturative stress. Lifetime PNRV, but not lifetime ATQ, was significantly predictive of psychological distress. PNRV was also linked to trait anxiety. Psychometric measures of anxious predisposition (trait anxiety and anxiety sensitivity) were more robust predictors of distress outcomes than lifetime history of ATQ/PNRV. Inquiry into lifetime history of nervios may be a useful point of entry in talking to Mexican immigrant mothers about stress and distress. However, standard tools for assessing anxiety sensitivity and trait anxiety appear most useful in identifying and explaining the presence of psychological distress. Further research is needed to determine the cross-cultural relevance of trait anxiety and anxiety sensitivity, and its implications for the development of anxiety treatments that are effective across cultures. © 2011 Wiley-Liss, Inc.

The prevalence of ataques de nervios in the Puerto Rico disaster study. The role of culture in psychiatric epidemiology.

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Guarnaccia, P J; Canino, G; Rubio-Stipec, M; Bravo, M

1993-03-01

This paper presents one of the few epidemiological studies of a popular category of distress, ataques de nervios (attacks of nerves), in the cross-cultural psychiatric literature. As part of a major study of the psychological consequences of the 1985 floods and mudslides which caused considerable damage and death in Puerto Rico, a question was added to the Diagnostic Interview Schedule/Disaster Supplement concerning ataques de nervios. This additional item provided the opportunity to carry out the first study of this important Puerto Rican popular category of distress using a representative, community-based sample. This paper addresses several key questions about ataques de nervios which come from previous psychiatric and anthropological literatures concerning the social correlates of who experiences an ataque de nervios and the relationship of ataques to social distress and psychiatric disorder. People who reported an ataque de nervios were more likely to be female, older, less educated, and formerly married. They were also more likely to meet criteria for anxiety and depressive disorders than those who had not experienced an ataque. The picture that emerges from our analyses is that those who suffer from a combination of social disadvantage, psychiatric disorder, and poor perceived health are more likely to experience an ataque de nervios.

Caracterización del nervio digital palmar en el miembro anterior equino

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Carolina Ortiz

2017-05-01

Full Text Available A partir de 60 miembros anteriores de caballos mestizos recolectados de un matadero en Santiago, Chile, se determinó que lo más frecuente es que el nervio digital palmar emita sus ramas dorsal y palmar antes (33% o al comienzo de la articulación metacarpofalángica (33%. En un 60% de los nervios analizados se evidenció la presencia de una a cuatro ramas accesorias y que ésta se presenta de manera similar entre diversas zonas, siendo la presentación más frecuente (26% en la zona de la articulación interfalángica proximal y que se dirigen hacia dorsal. En un 46,66% de las muestras el nervio digital palmar no se relaciona íntimamente con alguna estructura, seguido con 33,33% por la unión de éste al ligamento del espolón. Es muy poco frecuente que el nervio emita ramas superficiales que se dirijan hacia la dermis (6,66%, que se divida en tres grandes ramas en la articulación metacarpofalángica (3,33% o que pase bajo la arteria digital (3,33%, y más frecuente es que éste se disponga sobre la arteria en algún lugar de su recorrido hecho que ocurrió en el 35% de los casos. Estos resultados se presentan de manera relevante de considerar en procedimientos diagnósticos o quirúrgicos en la zona distal del miembro anterior del equino, ya que pueden alterar su sensibilidad y eficacia.

Association of a culturally defined syndrome (nervios) with chest pain and DSM-IV affective disorders in Hispanic patients referred for cardiac stress testing.

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Pavlik, Valory N; Hyman, David J; Wendt, Juliet A; Orengo, Claudia

2004-01-01

Hispanics have a high prevalence of cardiovascular risk factors, most notably type 2 diabetes. However, in a large public hospital in Houston, Texas, Hispanic patients referred for cardiac stress testing were significantly more likely to have normal test results than were Whites or non-Hispanic Blacks. We undertook an exploratory study to determine if nervios, a culturally based syndrome that shares similarities with both panic disorder and anginal symptoms, is sufficiently prevalent among Hispanics referred for cardiac testing to be considered as a possible explanation for the high probability of a normal test result. Hispanic patients were recruited consecutively when they presented for a cardiac stress test. A bilingual interviewer administered a brief medical history, the Rose Angina Questionnaire (RAQ), a questionnaire to assess a history of nervios and associated symptoms, and the PRIME-MD, a validated brief questionnaire to diagnose DSM-IV defined affective disorders. The average age of the 114 participants (38 men and 76 women) was 57 years, and the average educational attainment was 7 years. Overall, 50% of participants reported a history of chronic nervios, and 14% reported an acute subtype known as ataque de nervios. Only 2% of patients had DSM-IV defined panic disorder, and 59% of patients had a positive RAQ score (ie, Rose questionnaire angina). The acute subtype, ataque de nervios, but not chronic nervios, was related to an increased probability of having Rose questionnaire angina (P=.006). Adjusted for covariates, a positive history of chronic nervios, but not Rose questionnaire angina, was significantly associated with a normal cardiac test result (OR=2.97, P=.04). Nervios is common among Hispanics with symptoms of cardiac disease. Additional research is needed to understand how nervios symptoms differ from chest pain in Hispanics and the role of nervios in referral for cardiac workup by primary care providers and emergency room personnel.

Ataque de nervios: relationship to anxiety sensitivity and dissociation predisposition.

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Hinton, Devon E; Chong, Roberto; Pollack, Mark H; Barlow, David H; McNally, Richard J

2008-01-01

We investigated the relative importance of "fear of arousal symptoms" (i.e., anxiety sensitivity) and "dissociation tendency" in generating ataque de nervios. Puerto Rican patients attending an outpatient psychiatric clinic were assessed for ataque de nervios frequency in the previous month, and they completed the Anxiety Sensitivity Index (ASI) and the Dissociation Experiences Scale (DES). ASI scores were especially high in the ataque-positive group (M=41.6, SD=12.8) as compared with the ataque-negative group (M=27.2, SD=11.7), t(2, 68)=4.6, Pnervios, but the DES did not. In a linear regression analysis, ataque severity was significantly predicted by both the ASI (beta=.46) and the DES (beta=.29). The theoretical and clinical implications of the strong relationship of the ASI to ataque severity are discussed.

Estudio anatómico de la transferencia de los nervios accesorio y toracodorsal al nervio cubital en el gato Anatomic study of spinal accesory and thoracodorsal nerves transfer to ulnar nerve in cats

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J.R. Martínez-Méndez

2008-09-01

Full Text Available Las lesiones del plexo braquial son una de las patologías más graves y con mayor número de secuelas del miembro superior. En el momento actual las transferencias nerviosas se encuentran en primera línea del armamento terapéutico para reconstruir funciones proximales del miembro superior. En el estudio que presentamos se realizaron 20 transferencias nerviosas al nervio cubital del gato común, tomando bien el nervio accesorio del espinal (10 casos o bien el nervio toracodorsal (10 casos. Como grupo control se utilizó el lado contralateral al intervenido. Durante el año siguiente, se evaluó la reinervación mediante estudios electromiográficos, histológicos de nervio y músculo, así como histoquímicos de médula espinal. Tras el análisis de los resultados encontramos que las motoneuronas de ambos nervios donantes son capaces de conseguir reinervaciones parciales del territorio cubital.A brachial plexus injury is one of the most severe pathologies of the upper limb, and also has severe sequels. In the actual state of the art, nerve transfers are being used as first line of therapeutic approach in the reconstruction of proximal functions of the upper limb. In this study 20 nerve transfers were made to the ulnar nerve of the cat, using the spinal accessory nerve (10 cases or the thoracodorsal nerve (10 cases. The opposite side was used as control. During next year, reinnervation was assessed by electromyography, nerve and muscle histology and histochemical evaluation of the spinal cord. We found that motoneurons of both donor nerves are able to make partial reinervation of the ulnar nerve territory.

Esguince de tobillo de primer grado como causa de paresia del nervio peroneo común. Caso clínico

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Í. Úbeda-Pérez de Heredia

2015-06-01

Full Text Available Los esguinces de tobillo, con mecanismo de inversión, son incidencias comunes en la población y constituyen las lesiones más frecuentes en el deporte. Eventualmente pueden ocasionar una neuropatía del nervio peroneo común, debido a un mecanismo de tracción indirecta, a través del nervio peroneo superficial. Se presenta el caso clínico de un varón de 37 años que, tras sufrir un esguince de tobillo de primer grado durante la práctica deportiva, presentó una paresia intensa del nervio peroneo común que se constató mediante estudio ecográfico y electroneuromiográfico. El cuadro se resolvió con tratamiento conservador y electroestimulación. Pese a su rareza, ha de conocerse la asociación entre el esguince de tobillo y la lesión del nervio peroneo común y debe evaluarse la función de dicho nervio en todos los pacientes con esguince de tobillo en sus diferentes grados, tanto en su exploración inicial como en el seguimiento posterior.

Comparative phenomenology of ataques de nervios, panic attacks, and panic disorder.

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Lewis-Fernández, Roberto; Guarnaccia, Peter J; Martínez, Igda E; Salmán, Ester; Schmidt, Andrew; Liebowitz, Michael

2002-06-01

This article examines a clinical sample of 66 Dominican and Puerto Rican subjects who reported ataques de nervios and also psychiatric disorder, and disentangles the phenomenological experiences of ataque de nervios, panic attacks, and panic disorder. In-depth cultural interviews assessed the symptomatic phenomenology of ataque episodes from the local perspective as well as in terms of key panic features, such as recurrence, rapid peaking of symptoms, and lack of provocation. Independent diagnostic assessments of panic attacks and disorder were also used to establish the phenomenological overlap between ataque and panic. Our findings indicate that 36 percent of ataques de nervios fulfill criteria for panic attacks and between 17 percent and 33 percent for panic disorder, depending on the overlap method used. The main features distinguishing ataques that fulfill panic criteria from ataques that do not include whether the episodes were provoked by an upsetting event in the person's life and the rapidity of crescendo of the actual attack. A key finding is that ataques often share individual phenomenological features with panic episodes, but that these features usually do not "run together" during the ataque experience. This confirms previous findings that ataque is a more inclusive construct than panic disorder. The importance of these findings for the clinical diagnosis and treatment of persons with ataques is discussed.

Esguince de tobillo de primer grado como causa de paresia del nervio peroneo común. Caso clínico

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Í. Úbeda-Pérez de Heredia; G.Á. Sobrá-Hidalgo

2015-01-01

Los esguinces de tobillo, con mecanismo de inversión, son incidencias comunes en la población y constituyen las lesiones más frecuentes en el deporte. Eventualmente pueden ocasionar una neuropatía del nervio peroneo común, debido a un mecanismo de tracción indirecta, a través del nervio peroneo superficial. Se presenta el caso clínico de un varón de 37 años que, tras sufrir un esguince de tobillo de primer grado durante la práctica deportiva, presentó una paresia intensa del nervio peroneo co...

Mini-mastoidectomía para anastomosis hipogloso-facial con sección parcial del nervio hipogloso

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Campero, Álvaro; Ajler, Pablo; Socolovsky, Mariano; Martins, Carolina; Rhoton, Albert

2012-01-01

Introducción: La anastomosis hipogloso-facial es la técnica de elección para la reparación de la parálisis facial cuando no se dispone de un cabo proximal sano del nervio facial. La técnica de anastomosis mediante fresado mastoideo y sección parcial del hipogloso minimiza la atrofia lingual sin sacrificar resultados a nivel facial. Método: La porción mastoidea del nervio facial transcurre por la pared anterior de la AM, a un promedio de 18+/-3 mm de profundidad respecto de la pared lateral. Se debe reconocer la cresta supramastoidea, desde la cual se marca una línea vertical paralela al eje mayor de la AM, 1 cm por detrás de la pared posterior del CAE El fresado se comienza desde la línea medio mastoidea hasta la pared posterior del CAE. Una vez encontrado el nervio facial en el tercio medio del canal mastoideo, el mismo es seguido hacia proximal y distal. Resultados: El abordaje descripto permite acceder al nervio facial intratemporal en su porción mastoidea, y efectuar un fresado óseo sin poner en riesgo al nervio o a estructuras vasculares cercanas. Se trata de un procedimiento técnicamente más sencillo que los abordajes amplios habitualmente utilizados al hueso temporal; no obstante su uso debe ser restringido mayormente a la anastomosis hipogloso-facial. Conclusión: Esta es una técnica relativamente sencilla, que puede ser reproducida por cirujanos sin mayor experiencia en el tema, luego de su paso por el laboratorio de anatomía. PMID:23596555

Síndrome oculoglandular de Parinaud causada por esporotricose

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Ribeiro,Alexandre Sampaio de Abreu; Bisol,Tiago; Menezes,Marcela Sant'Ana

2010-01-01

A síndrome oculoglandular de Parinaud é uma doença ocular rara causada por diferentes agentes etiológicos, entre eles bactérias, vírus e fungos. É caracterizada por uma conjuntivite granulomatosa, acompanhada de linfadenopatia pré-auricular adjacente e pode trazer sequelas caso não seja prontamente tratada. Neste artigo é relatado o caso de uma jovem técnica de enfermagem e estudante de medicina veterinária apresentando a síndrome oculoglandular de Parinaud causada pelo fungo Sporothrix schen...

Ataques de nervios in the Puerto Rican Diagnostic Interview Schedule: the impact of cultural categories on psychiatric epidemiology.

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Guarnaccia, P J; Rubio-Stipec, M; Canino, G

1989-09-01

This paper examines the effect of the cultural category ataques de nervios on responses to the Puerto Rican Diagnostic Interview Schedule (DIS), a Spanish version of structured psychiatric diagnostic interview developed for the NIMH Epidemiologic Catchment Area study. An ataque de nervios scale was created from the Somatization items of the DIS to explore the effect of this culturally meaningful category of distress on responses to a standard psychiatric interview. Analysis of 1,513 cases from a representative sample of the island of Puerto Rico indicated that people reporting ataque symptoms fit the social characteristics described for ataques sufferers in the ethnographic literature. Qualitative data indicated that Puerto Ricans were reporting ataques de nervios in the panic section of the DIS. Questions are raised about the validity of the somatization and panic sections of the DIS in cross-cultural research with Hispanics.

Seguimiento neurofisiológico en injertos de nervios periféricos

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Roberto Portillo

2003-03-01

Full Text Available Objetivo: Seguimiento neurofisiológico en 10 pacientes con injertos de nervios periféricos. Lugar: Unidad de Neurofisiología Clínica del Hospital Nacional Guillermo Almenara Irigoyen, EsSalud. Material y Métodos: Se estudió 10 pacientes de 6 a 39 años, con lesiones de nervios periféricos en miembros superiores, en quienes se realizó injertos. Se hizo control neurofisiológico periódico con electromiografía, velocidad de conducción nerviosa motora y sensitiva. Resultados: Se encontró una excelente evolución de los 10 casos, demostrada por el seguimiento electrofisiológico, en algunos de ellos con recuperación precoz de la conducción nerviosa motora e incluso sensitiva, como en los casos de lesión cubital (casos 4, 7 y 8 y cubital y mediano (caso 10. Esta recuperación tuvo un correlato clínico, con cambios neurovegetativos, motores y sensitivos. Conclusiones: La electrofisiología juega un papel importante en el seguimiento postoperatorio de las lesiones de los nervios periféricos en las que se realiza injertos. El tiempo de recuperación neurofisiológica y clínica de un injerto nervioso es muy variable, entre 1 y 2 años o más. Sorprende que la fisiología clínica no siempre guarde una relación proporcional con la electrofisiología, pues en algunos casos la recuperación clínica es aceptable, mientras que en otros es desproporcionada a la gran lentitud de la velocidad de conducción nerviosa.

Estudio preliminar experimental en ratas: uso de plasma rico en plaquetas en el tratamiento de lesiones agudas de nervios periféricos

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Natalia Sorrenti-Pírez

Full Text Available Antecedentes y Objetivos. Si consideramos la importancia social y laboral que han adquirido las lesiones de los nervios periféricos por las graves y permanentes secuelas motoras, sensitivas y vegetativas a que dan lugar, cualquier esfuerzo terapéutico para mejorar los resultados de la reparación nerviosa representa un paso positivo dentro del abordaje general de esta afección. A pesar de realizar una sutura técnicamente perfecta, nunca se logra repoblar el segmento distal con la misma cantidad de axones. Esto hace que se busquen alternativas para potenciar la regeneración nerviosa. Dentro de las terapias emergentes, la utilización de plasma rico en plaquetas (PRP tiene un efecto beneficioso en la reparación nerviosa. Hasta este momento los estudios se han centrado en la utilización del PRP dentro de injertos o tutores interpuestos entre los cabos y no se ha prestado atención a la aplicación del mismo en la sutura directa. Material y Métodos. Estudiamos 8 ratas Wistar a las que se les seccionaron ambos nervios ciáticos; a una de las suturas se le aplicó PRP y el otro nervio suturado se tomó como caso control. En una segunda etapa realizamos la biopsia de ambos nervios a diferentes tiempos y fijamos con un fluoróforo lipofílico que tiñe las fibras regeneradas. Tomamos 2 grupos: a los 40 días y a los 60 días. Calculamos el índice de función del nervio ciático. Resultados. Los nervios seccionados y tratados con PRP presentaron un adelanto en la recuperación de la función nerviosa medida por pruebas funcionales; confirmamos anatómicamente mediante el estudio histológico del nervio. Conclusiones. Los resultados obtenidos en el estudio indican una estimulación del proceso fisiológico de reparación nerviosa usando PRP.

Nervios corneales prominentes como manifestación inicial en el síndrome de neoplasia endocrina múltiple tipo 2B

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Vianney Cortés-González

2015-10-01

Conclusiones: La identificación de las características oculares, tanto los nervios corneales como los neuromas palpebrales, puede ayudar a un diagnóstico temprano del síndrome MEN2B. El oftalmólogo debe identificar las características oftalmológicas de la enfermedad y diferenciarlas de otras afecciones como las distrofias corneales. Los nervios corneales prominentes consisten en numerosos axones desmielinizados y múltiples células de Schwann.

Regeneración de las lesiones críticas del nervio periférico con factores de crecimiento: Estudio experimental

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García Medrano, Belén

2013-01-01

Introducción:El objetivo del proyecto es estudiar la regeneración de lesiones no reparables de nervio periférico mediante un injerto muscular enriquecido con factores de crecimiento. Material y método: Estudio experimental controlado, nivel I de evidencia cientifica. Comparamos diez ratas con reparación de lesiones de 15 mm del nervio ciático mediante injerto muscular acelular, con un grupo de diez años en los que se añade la inyección de 2 cc de IGF-l (10 mg/ml de me

Emotionally triggered asthma and its relationship to panic disorder, ataques de nervios, and asthma-related death of a loved one in Latino adults.

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Vazquez, Karinna; Sandler, Jonathan; Interian, Alejandro; Feldman, Jonathan M

2017-02-01

Research has demonstrated high comorbidity between asthma and panic disorder (PD). Less is known about the relationship between asthma and the Latino cultural idiom of distress of ataques de nervios, as well as the role that psychosocial stressors play. The current study tested the hypotheses that Latino asthma patients who experience PD, ataques de nervios, and/or asthma-related death of a loved one endorse greater psychological triggers of asthma, greater perceived impact of asthma triggers, and greater difficulty controlling such triggers than do those without these conditions. Data originated from an interview conducted prior to a randomized controlled trial in which 292 Latino adults with self-reported asthma were recruited from outpatient clinics in the Bronx, NY. The PRIME-MD Patient Health Questionnaire (PHQ) was used to screen for PD symptoms, while the Structured Clinical Interview for DSM-IV (SCID-I) was used to confirm diagnosis of PD. Lifetime history of ataques de nervios and asthma-related death of a loved one were based upon self-report. Asthma triggers were examined using the Asthma Trigger Inventory (ATI). PD, ataques de nervios, and asthma-related death of a loved one each predicted a higher frequency of psychological asthma triggers, controlling for gender and comorbid medical conditions. Participants with PD also reported greater impact of asthma triggers than those without PD, while no significant differences in perceived control were observed. Providers should screen for PD, ataques de nervios, and asthma-related death of a loved one in Latino asthma patients, given their observed association with emotionally triggered asthma. Copyright © 2016 Elsevier Inc. All rights reserved.

Entérate de cómo cambia el cerebro cuando se lesiona un nervio

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Julieta Troncoso

2016-02-01

Full Text Available Desde hace algunos años el grupo de investigación de Neurofisiología Comportamental de la Universidad Nacional de Colombia ha venido evaluando los cambios que ocurren en el sistema nervioso central luego de la lesión de un nervio periférico. Específicamente trabajamos con el modelo de lesión del nervio facial en roedores para evaluar las modificaciones funcionales y estructurales que ocurren en la corteza sensoriomotora primaria luego de la lesión. Al lesionarse el nervio facial, el cerebro entra en un programa de reorganización que incluye cambios electrofisiológicos en las neuronas de la corteza motora que comandan los movimientos faciales (M1. En este sentido, las células de la corteza motora cerebral se vuelven más excitables y modifican su respuesta ante estímulos sensoriales. La reorganización tras la lesión también incluye cambios morfológicos en M1: las células piramidales de la corteza motora retraen su árbol dendrítico y disminuye la densidad de sus espinas dendríticas. En asociación con estos cambios, las células de M1 disminuyen transitoriamente su inmunorreactividad para NeuN (marcador específico de núcleos neuronales y aumentan la expresión de GAP43 (proteína de crecimiento axonal. Esto indica, posiblemente, un cambio metabólico celular en asociación con la búsqueda de nuevas dianas sinápticas. Finalmente, hallamos que la glía circundante en M1 (tanto astrocitos como microglía se activa de manera muy temprana luego de lesiones del nervio facial. Esto podría indicar que el remodelamiento estructural y funcional hallado en las neuronas corticales es el resultado de la interacción entre la activación de la glía circundante y las células piramidales de M1 (aunque se necesitan muchos experimentos adicionales que así lo demuestren.

Contribución de fibras mielínicas provenientes de los nervios espinales lumbares L4, L5 y L6 al nervio ciático de rata adulta y sus ramas principales Contribution of myelunated fibers from spinal L4, L5 and L6 nerves to the sciatic nerve and its main branches in the adult rat

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Hernán Hurtado

2000-04-01

Full Text Available El nervio ciático de la rata está formado por los nervios espinales (ne lumbares L4, L5 y L6. Sin embargo, aún no se ha definido el aporte en fibras mielínicas de estos nervios espinales a lo largo del tronco nervioso. En este estudio se transectaron selectivamente los NE L4, L5 y L4-L5. Luego de una semana se disecaron los nervios ciático, tibial, sural y peroneal. Estas muestras se fijaron y procesaron para microscopía óptica y a partir de cortes coloreados con azul de toluidina se contaron las fibras mielínicas degeneradas y normales. L4 contribuyó con fibras mielínicas principalmente al nervio peroneal y L5 a los nervios ciático, tibial y sural. En general, el aporte de L6 fue menor y variable a lo largo del tronco nervioso comparado con las otras dos ramas espinales. Nuestros resultados brindan información valiosa para posteriores estudios que busquen correlacionar la contribución de los nervios espinales que componen el ciático y sus ramas principales con la función de la extremidad inferior. The rat sciatic nerve is composed by the L4, L5 and L6 lumbar spinal nerves. However, the contribution in myelinated fibers originating from these nerves along this nervous trunk has not yet been defined. In the present study, the L4, L5 and L4-L5 spinal nerves were selectively transected. After one week the sciatic, tibial, sural and peroneal nerves were dissected. These samples were fixed and processed for optical microscopy, and both degenerated and normal myelinated fibers were counted in toluidine blue-stained semi-thin sections. L4 contributed with myelinated fibers mainly to the peroneal nerve, and L5 to the sciatic, tibial and sural nerves. In general, the contribution of L6 was smaller and variable along the nervous trunk in comparison to the other two spinal branches. Our results give key information for further studies looking to correlate the contribution of spinal nerves making part of the sciatic nerve and its main

Comparación de tres técnicas de trazado retrógrado para la identificación del origen espinal del nervio ciático en ratón.

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Myriam L. Velandia

2002-12-01

Full Text Available En el presente trabajo se compararon tres técnicas para la aplicación de dos tipos de trazadores retrógrados fluorescentes (Dil y Fluorogold, con el fin de identificar las neuronas motoras y sensoriales que contribuyen con fibras al nervio ciático en ratones adultos. Se ensayó la aplicación de cristales directamente en el nervio, la inyección intraneural y la impregnación del nervio seccionado usando una cámara de silicona. La localización específica de las neuronas motoras en la médula espinal y las neuronas sensoriales en los ganglios de la raíz dorsal que aportan al nervio ciático de ratón se logró aplicando el Fluorogold mediante una cámara en el cabo proximal de los nervios previamente seccionados. Al utilizar el trazador Dil, la misma técnica no permitió hacer la identificación específica de las neuronas. Se encontró que al nervio ciático de ratón podrían contribuir el ganglio de la raíz dorsal más rostrales que los informados para ratas. Estos resultados muestran que la metodología de aplicación de neurotrazadores en cápsula y la descalcificación de tejidos es útil para la localización de neuronas de ganglios de raíz dorsal y de la médula espinal que componen el nervio ciático de ratón adulto, lo que en el futuro permitirá obtener mayor información sobre la neuroanatomía básica del ratón.

"Nervios" and "Modern Childhood": Migration and Shifting Contexts of Child Life in the Ecuadorian Andes.

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Pribilsky, Jason

2001-01-01

Argues that beyond explanations predicated on psychological ideas of separation and attachment, "nervios," a depression-like disorder among children in the southern Ecuadorian Andes, reflects the limits of children's abilities to accept terms of family life increasingly defined through transnational migration and new consumption…

El láser de helio-neon en la regeneración del nervio ciático seccionado y suturado

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Pedro Rodríguez Sotelo

Full Text Available Para valorar el efecto del láser de helio-neón (He-Ne sobre la regeneración del nervio ciático, seccionado y suturado, se utilizaron un total de 72 ratas Wistar, que se dividieron en 3 grupos, los cuales fueron irradiados con He-Ne, luz de xenón y luz solar respectivamente. Al grupo testigo sólo se les realizó la sección y sutura del nervio ciático. Lasratas a las que se les irradió el nervio con luz de xenón y luz solar evolucionaron igual que el grupo testigo, es decir, se presentaron en su totalidad, lesiones tróficas de mayor o menor grado, así como lesiones motrices. En el grupo en el que se utilizó He-Ne, sólo se observó en un animal la pérdida de la una de un dedo y no se apreciaron trastornos motrices. La irradiación con láser de He-Ne tiene una importante influencia en la restauración de las lesiones nerviosas en la rata

Muerte cerebral causada por consumo de psicofármacos

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Iglesias Rozas, José Rafael, 1942-

1987-01-01

Tres imágenes de una biopsia de un cerebro en estado de muerte cerebral causada por consumo de psicofármacos. Three pictures of a biopsy of a brain that has died because of consumption of psychoactive drugs.

Comparación de tres técnicas de trazado retrógrado para la identificación del origen espinal del nervio ciático en ratón.

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Myriam L. Velandia; José V. Montoya; Marlén Martínez; Sandra Perdomo; Jaime E. Castellanos

2002-01-01

En el presente trabajo se compararon tres técnicas para la aplicación de dos tipos de trazadores retrógrados fluorescentes (Dil y Fluorogold), con el fin de identificar las neuronas motoras y sensoriales que contribuyen con fibras al nervio ciático en ratones adultos. Se ensayó la aplicación de cristales directamente en el nervio, la inyección intraneural y la impregnación del nervio seccionado usando una cámara de silicona. La localización específica de las neuronas motoras en la médula espi...

Lesiones del nervio facial provocan alteraciones en las células microgliales en el sistema nervioso central

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Jeimmy Cerón

2016-12-01

Full Text Available Introducción. El Laboratorio de Neurofisiología Comportamental de la Universidad Nacional de Colombia ha descrito modificaciones tanto estructurales como electrofisiológicas en neuronas piramidales de la corteza motora producidas por la lesión del nervio facial contralateral en ratas. Sin embargo, poco se conoce si dichos cambios neuronales también se acompañan de modificaciones en las células gliales circundantes. Objetivo. Caracterizar en ratas el efecto de la lesión unilateral del nervio facial sobre la activación y proliferación de células de la microglía en la corteza motora primaria contralateral. Materiales y métodos. Se realizaron experimentos de inmunohistoquímica para detectar células microgliales en tejido cerebral de ratas sometidas a lesión del nervio facial, sacrificadas a distintos tiempos luego de la misma. Se realizaron dos tipos de lesiones: reversible (por compresión, que permite recuperación de la función e irreversible (por corte, que provoca parálisis permanente. Los tejidos cerebrales de animales sin lesión (Control absoluto y con falsa cirugía (Sham se compararon con los de animales lesionados sacrificados a 1, 3, 7, 21 ó 35 días post-lesión. Resultados. Las células microgliales en la corteza motora de animales lesionados irreversiblemente mostraron signos de proliferación y activación desde los 3 hasta los 7 días post-lesión. La proliferación de las células microgliales en animales con lesión reversible fue significativa sólo a los 3 días post-lesión. Conclusiones. La lesión del nervio facial produce modificaciones en las células microgliales de la corteza motora primaria. Estas modificaciones podrían estar involucradas en la generación de los cambios morfológicos y electrofisiológicos descritos en las neuronas piramidales de la corteza motora que comandan los movimientos faciales.

Ataques de nervios: proposed diagnostic criteria for a culture specific syndrome.

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Oquendo, M; Horwath, E; Martinez, A

1992-09-01

The authors propose a set of diagnostic criteria and report two cases of ataque de nervios, a syndrome of brief duration seen primarily in Spanish-speaking people of the Caribbean. Following a psychosocial stressor, the afflicted person demonstrates impulsivity, dissociation and communication and perceptual disturbances. The symptoms often begin in the presence of the family, allow a temporary relinquishing of social roles, and result in the mobilization of the social network in support of the person. Further research is needed to improve our understanding of this culture specific syndrome and its relationship to psychiatric disorder.

Schwannoma del nervio facial intraparotídeo. Un dilema terapéutico

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Paula Barba-Recreo

2015-07-01

Full Text Available Los schwannomas del nervio facial intraparotídeos son tumores benignos poco frecuentes, suponiendo frecuentemente un reto diagnóstico y terapéutico. La mayoría de los pacientes presentan una masa parotídea asintomática y las pruebas de imagen y la punción con aguja fina no suelen ser concluyentes en el diagnóstico. Tras la revisión de la literatura a propósito de un caso, pretendemos proporcionar cierta guía para el tratamiento de esta rara patología.

Neuropatía leprótica: una mirada integral de la afección periférica causada por Mycobacterium leprae

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Héctor Alejandro Serrano-Coll

2017-01-01

Full Text Available La lepra es una enfermedad infecciosa granulomatosa crónica, causada por Mycobacterium leprae . El curso natural de esta enfermedad está relacionado con una neuropatía periférica denominada neuropatía leprótica, la cual es responsable de la aparición de discapacidades en ojos, manos y pies. Se realizó una búsqueda estructurada en la base de datos de Pubmed y OVID utilizando los siguientes términos MeSH : lepra, neuropatía, nervio periférico, célula de Schwann, discapacidad, biomarcadores. El 83,8 % de los artículos referenciados en esta revisión fueron seleccionados a través de esta búsqueda. El daño neural en lepra es una patología en la que intervienen múltiples mecanismos fisiopatógenicos, que incluyen: la respuesta inmune del hospedero, la interacción de M. leprae a diferentes ligandos en las células Schwann, lo que permite la activación de vías de señalización celular que inducen inflamación, desmielinización y daños a nivel del axón, que se traducen en discapacidad sensitiva y motora en el paciente con lepra. Pero a pesar de que en las últimas décadas se han realizado avances importantes en el entendimiento de esta neuropatía, esto no se ha visto reflejado en herramientas o biomarcadores que sean útiles en la detección temprana del daño periférico causado por la lepra.

Neuropatía compresiva del nervio interoseo posterior a nivel del codo (síndrome de la arcada de frohse: ¿debe incluirse en el listado de enfermedades profesionales?

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Raúl Jesús Regal Ramos

Full Text Available Introducción: La afectación compresiva del nervio radial se encuentra recogida en el último Listado de Enfermedades Profesionales (LEP, con el código 2F0601. En este apartado no se recoge entre las "principales actividades" capaces de producir afectación del n.radial la compresión de origen laboral más frecuente de este, el síndrome de la Arcada de Frohse (SAF. Objetivos: El objetivo de esta revisión no es solo reflejar que la afectación compresiva del nervio interóseo posterior puede considerarse una Enfermedad Profesional (EP, sino que además debería estar recogida en el actual listado de EP entre las "principales actividades capaces de producir afectación del nervio radial". Metodología: Se han revisado hasta Febrero de 2010 las siguientes bases de datos bibliográficas: Medline, Embase, Cochrane. Resultados: Esta revisión bibliográfica nos permite concluir que: El SAF puede tener un origen laboral (la fibrosis del supinador corto se relaciona con movimientos repetidos de pronación y supinación del antebrazo y esta descrita su mayor prevalencia en determinadas profesiones que realizan estos movimientos. El SAF es la neuropatía compresiva de origen laboral mas frecuente del nervio radial, la más relacionada con los movimientos repetitivos de la mano y antebrazo. La Arcada de Frohse es el lugar más frecuente de compresión del radial. Conclusiones: Por tanto, el SAF puede considerarse una EP, si asocia factores de riesgo laborales suficientes, y debería estar recogido en el LEP por tratarse de la localización más frecuente de compresión de origen laboral del nervio radial.

The meaning of nervios: a sociocultural analysis of symptom presentation in San Jose, Costa Rica.

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Low, S M

1981-03-01

The foundation of the symbolic tradition in medical anthropology is the examination of a patient's experience of a category of illness. The interpretation of folk explanations of etiology and nosology provides insight into the cultural definition of what constitutes an illness, how and why an illness is labeled, and how the afflicted individual should be treated. Further, the analysis of sociocultural meaning emerges as a critical theoretical contribution to our understanding of health and culture. Allen Young in his article "Some Implications of Medical Beliefs and Practices for Social Anthropology" suggests " that if we want to learn the social meaning of sickness, we must understand that 'signs,' whatever their genesis, become 'symptoms' because they are expressed, elicited, and perceived in socially acquired ways" (1976: 14). He further states that some categories of sickness are particularly interesting in that they enable people to organize the illness event into an episode that has form and meaning (1976: 19-20). Nervios is an example of a symptom that has acquired a special sociocultural pattern of expression, elicitation and perception in San Jose, Costa Rica. The empirical study of symptom presentation in general medicine and psychiatric outpatient clinics describes the patients who present the symptom and their associated attributes and explanations of the symptom's occurrence. The meaning of nervios is then discussed within a social interactional and symbolic framework.

COURSE OF THE MAXILLARY ARTERY THROUGH THE LOOP OF THE AURICULOTEMPORAL NERVE. Recorrido de la arteria maxilar a través del bucle del nervio aurículotemporal

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Kavya Bhat

2016-03-01

Full Text Available Las variaciones en el curso de la arteria maxilar se describen a menudo, con sus relaciones con el músculo pterigoideo lateral. En el presente caso informamos una variación exclusiva en el curso de la arteria maxilar que no fue publicada antes. En un cadáver masculino de 75 años arteria maxilar derecho estaba pasando por el bucle del nervio auriculo-temporal. La arteria meníngea media provenía de la arteria maxilar con un bucle del nervio auriculo-temporal. La arteria maxilar pasaba profunda con respecto al nervio dentario inferior pero superficial al nervio lingual. El conocimiento de estas variaciones es importante para el cirujano y también serviría para explicar la posible participación de estas variaciones en la etiología del dolor mandibular. Variations in the course of the maxillary artery are often described with its relations to the lateral pterygoid muscle. In the present case we report a unique variation in the course of the maxillary artery which was not reported before. In a 75 years old male cadaver the right maxillary artery passed through the loop of the auriculotemporal nerve. The middle meningeal artery was arising from the maxillary artery within the nerve loop of auriculotemporal nerve. Further the maxillary artery passed deep to the inferior alveolar nerve but superficial to the lingual nerve. The knowledge of these variations is important for surgeons and it would also explain the possible involvement of these variations in etiology of the craniomandibular pain.

A model of the generation of ataque de nervios: the role of fear of negative affect and fear of arousal symptoms.

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Hinton, Devon E; Lewis-Fernández, Roberto; Pollack, Mark H

2009-01-01

This article examines a model of the generation of ataque de nervios, according to which both fear of negative affectivity and fear of arousal symptoms are associated with the emergence of ataques. We examine the relationship of fear of negative affectivity and fear of arousal to the severity of ataque de nervios during the last month and the last 6 months among Caribbean Latinos residing in the United States. The measures include a Fear of Anger Scale and the Anxiety Sensitivity Index (ASI), the ASI augmented with two items that assess fear of arousal symptoms common in ataques: chest tightness and a sense of inner heat. In keeping with the model of ataque generation, one-way analysis of variances (ANOVAs) and discriminant function analyses illustrated that items assessing "fear of negative affect" and "fear of somatic and psychological symptoms of arousal" both differentiated well among the levels of ataque severity. In addition, key ataque symptoms-mental incapacitation fears, shakiness, chest tightness, palpitations, and a sense of inner heat-were the best discriminators among levels of ataque severity. In patients with severe ataques, the scores of "fear of negative affect" and "fear of ataque-de-nervios-type somatic and psychological symptoms" were extremely elevated. This further suggests that both these types of fears are associated with this idiom of distress and that the specific content of the fears is linked to the symptom picture of the idiom. This suggests specific therapeutic targets for the treatment of ataque, namely, the reduction of anxiety sensitivity (and more generally negative-emotion and arousal sensitivity) using cognitive behavioral therapy (CBT), relaxation, and mindfulness techniques.

ANASTOMOSIS ENTRE LA RAMA PROFUNDA DEL NERVIO CUBITAL Y EL NERVIO MEDIANO EN LA MANO. Anastomosis between the deep branch of the ulnar nerve and the median nerve in the hand

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Luis E Criado del Río

2016-03-01

Full Text Available Introducción: La anastomosis de Riche-Cannieu (ARC es una variación anatómica formada entre la rama tenar del nervio mediano (NM y la rama profunda del nervio cubital (NC. Debido a la importancia clínica y electromiográfica su descripción anatómica es de gran interés, ya que debido a esta variación anatómica existen distintas formas de inervación motora a nivel de la mano. Materiales y Métodos: Se realizaron disecciones cadavéricas en 38 manos (19 cadáveres de ambos sexos formolizados en solución al 5 %, de entre 50 y 70 años de edad. Se utilizó instrumental y técnicas convencionales de disección. Resultados: En la rama profunda del NC no se evidenciaron variaciones y finalizaba su recorrido en el músculo aductor del pulgar. En el 86,84%  de los casos emerge una rama que se anastomosa con el NM de diferentes formas. Esta rama anastomótica, en el 50% de las manos, era una arcada nerviosa de considerable calibre entre el NC y NM, que daba ramas motoras a los músculos de la eminencia tenar. Discusión: El conocimiento de esta anastomosis es muy importante ya que, en casos de lesión del nervio mediano o cubital, puede causar confusión clínica, quirúrgica y en los hallazgos electromiográficos. Debido a su alta frecuencia fue considerada un rasgo anatómico normal. Introduction: The Riche-Cannieu anastomosis (RCA is an anatomic variation formed between the thenar branch of the median nerve and the deep branch of the ulnar nerve. Its anatomical description is of great interest because of its clinical and electromyographic relevance. Due to the RCA, there are various types of hand motor innervation. Materials and Methods: Thirty eight hands from 19 corpses (formolized in a 5% solution whose ages ranged from 50 to 70 years old were dissected. Conventional instruments and techn-iques were used. Results: The pathway of the deep branch of the ulnar nerve did not show variations and ended at the adductor pollicis muscle. In 86

Relato de Caso: Dermatite de Contato Causada por Arruda (Ruta graveolens L.)

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Cortez, Lúcia Elaine Ranieri; Cortez, Diógenes Aparício Garcia

2008-01-01

Um homem de 26 anos desenvolveu uma reação fototóxica em suas pernas, após utilizar as partes aéreas frescas da arruda (Ruta graveolens L.), para repelir pernilongos, depois de se expor ao sol. A hipersensibilidade foi causada devido às furanocumarinas (psoralenos) presentes no óleo essencial da arruda.

Parálisis Parcial del Nervio Oculomotor Secundaria a Zoster Sine Herpete: Reporte de Un Caso

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Oscar L. Rueda O.

2013-12-01

Full Text Available Introducción: Herpes Zoster es la reactivación del Virus Varicela Zóster en los ganglios sensoriales y/o autonómicos, típicamente caracterizado por dolor profundo de distribución dermatómica y erupciones vesiculares en piel. De manera infrecuente, puede presentarse el Zoster Sine Herpete, condición en la cual se presenta la distribución dermatómica del dolor en ausencia de lesiones dérmicas, convirtiendo el diagnóstico en un reto clínico. Caso clínico: Hombre de 69 años con dolor periorbitario, epifora, ptosis y pérdida de la aducción del ojo derecho. Los estudios imagenológicos y de laboratorio fueron normales, descartando así las principales causas de parálisis del nervio oculomotor. Se hizo diagnóstico presuntivo de Zoster Sine Herpete y se inició prueba terapéutica con valaciclovir, observándose resolución total de la sintomatología seis semanas después. Discusión: Este caso puede ser el primero en describir una parálisis parcial dolorosa del nervio oculomotor como única manifestación clínica de la reactivación del Virus Varicela Zóster y busca alertar al personal médico sobre una enfermedad latente que hace de sus reapariciones una gama de presentaciones no siempre fáciles de identificar.

Estudio de la regeneración de nervio periférico a través de cámaras permeables de silicona con poros de 10 y 60 micras

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Luis H. Alzate

1999-09-01

Full Text Available Se entubó el nervio ciático de ratas, luego de un corte transverso, utilizando una cámara de silicona de 14 mm de largo que tenía dos ventanas de 8 mm de largo cubiertas con malla de 10 o 60 pm. Después de 6 meses, los animales se perfundieron con una mezcla de glutaraldehído y paraformaldehído, y se evaluó el aspecto microscópico de los nervios regenerados en dos niveles dentro de la cámara (3 mm y nivel medio y 5 mm distal a ésta. Se contó el número de fibras mielínicas presentes en cada nivel y tratamiento, y se realizó una comparación entre ellos. Se encontró una importante desorganización del endoneurio a nivel medio de la cámara. Distalmente, los conteos de fibras mielínicas fueron muy bajos. No se observaron diferencias significativas entre los grupos con mallas de 10 y 60 pm. En conclusión, la presencia de poros de 10 o 60 pm no impide la entrada masiva de fibroblastos a la cámara, llevando a una marcada desorganización del nervio regenerado.

Meningite e endocardite infecciosa causada por Rhodotorula mucilaginosa em paciente imunocompetente

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Sergio Henrique Loss

2011-12-01

Full Text Available Os autores relatam o caso de um homem imunocompetente admitido com comprometimento agudo do sistema nervoso, crise hipertensiva e insuficiência renal, vindo a receber diagnóstico de meningite e endocardite infecciosa por Rhodotorula mucilaginosa. Até onde sabemos, esta é a primeira descrição de infecção simultânea das meninges e do endotélio causada por Rhodotorula em um paciente sem comprometimento imunológico.

Queratitis causada por Paecilomyces lilacinus. Reporte de un caso

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Alejandro del Castillo Ruiz

2016-01-01

Conclusiones: La queratitis micótica es una infección corneal muy seria, de evolución tórpida, que puede causar ceguera. Comúnmente se desarrolla en pacientes después de un trauma o en aquellos con una superficie corneal comprometida. Voriconazol se ha referido como un fármaco útil para el tratamiento de úlceras corneales causadas por Paecilomyces lilacinus con muy buena penetración a estroma, acuoso y vítreo por vía oral y tópica. Un diagnóstico y tratamiento oportunos fueron esenciales en este caso de queratitis micótica para su resolución.

Clasificación del reflejo óculo-cardiaco por la desviación centesimal de viola

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Luis Rubén Paz B.

1947-09-01

Full Text Available Desde mucho tiempo antes, habían notado los observadores, las modificaciones reflejas de las funciones vegetativas causadas por la excitación de algún nervio sensitivo y aun habían deducido de esta observación, aplicaciones prácticas, como la cura operatoria de las lesiones nasales en el tratamiento de algunos casas de asma (W. Hack a explicaciones patogénicas, como la atribución del sincope del principio de la anestesia por inhalación a la brusca irritación de las terminaciones sensitivas de la pituitaria (Knoll y Kratschmer.

Peracute bovine mastitis caused by Klebsiella pneumoniae Mastite bovina hiperaguda causada por Klebsiella pneumoniae

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M.G. Ribeiro

2008-04-01

Full Text Available Relata-se a ocorrência de graves sintomas de mastite hiperaguda em vaca, causada por Klebsiella pneumoniae, na terceira semana de lactação. Descrevem-se aspectos epidemiológicos, sintomas clínicos, procedimentos de diagnóstico microbiológico, conduta terapêutica e medidas de controle.

Ataques de nervios in relation to anxiety sensitivity among island Puerto Ricans.

Science.gov (United States)

Cintrón, Jennifer A; Carter, Michele M; Sbrocco, Tracy

2005-12-01

This study investigated the symptom profile of ataques de nervios (ADN) among Puerto Rican volunteers from the community who self-identified as having experienced at least one ataque. As expected, the most commonly reported ataques-specific symptoms were crying, anger, nervousness, and becoming hysterical. Comparing the responses of those with ADN to those with no history of ADN but who reported elevated anxiety sensitivity (AS) indicated that both groups were comparable on measures of depression, state and trait anxiety, and associated panic symptoms. As expected, both groups scored significantly higher on all measures than did participants with no history of ADN and low AS with the exception of the measure of state anxiety. It is unclear, however, whether the overlap in symptom severity between those with ADN and those with elevated anxiety sensitivity indicates that ADN and AS are the same or distinct conditions.

DOENÇAS CAUSADAS POR VÍRUS NA CULTURA DE FEIJOEIRO (Phaseolus vulgaris L.

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Felipe Rafael Garcés Fiallos

2010-12-01

Full Text Available O feijoeiro é atacado, além de fungos, nematóides e bactérias, por vírus que podem causar danos e perdas numa lavoura. As doenças causadas por vírus têm exercido um papel relevante na baixa produtividade do feijoeiro no Brasil e outros países Latino-Americanos. Os métodos de controle para as viroses de plantas cultivadas são, em geral, muito restritos. Pela falta desta informação e pela importância da cultura do feijão, se traz esta revisão, onde são relatadas as doenças virais mais importantes desta cultura dentro do Brasil e fora dele, explicando detalhadamente sua sintomatologia, etiologia e seu controle. As doenças viróticas mais importantes no feijoeiro no Brasil são o bean common mosaic virus (BCMV, bean golden mosaic virus (BGMV, bean rugose mosaic virus (BRMV, cowpea mild mottle virus (CpMMV e southern bean mosaic virus (SBMV. Esta revisão traz o mais importante em relação às doenças primordiais causadas por vírus de plantas na cultura de feijão.

Aspectos de la respuesta inmune innata en las infecciones intramamarias causadas por Staphylococcus aureus en bovinos

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Elizabet A.L Pereyra

2014-12-01

Full Text Available Staphylococcus aureus es el principal agente causante de mastitis bovina en Argentina y en el mundo. Esta bacteria ocasiona infecciones crónicas que generan importantes pérdidas a los productores y la industria lechera. El objetivo de este artículo es caracterizar los mecanismos que intervienen en la infección causada por S. aureus en la glándula mamaria bovina, evaluando dos aspectos diferentes del proceso infeccioso: por un lado, lo vinculado con la respuesta inmune innata por parte del hospedador, y por otro, la capacidad de la bacteria para evadir el sistema inmune e interactuar con diferentes tipos celulares. La exploración de la interacción de S. aureus con el sistema inmune de la glándula mamaria bovina permitirá identificar blancos para delinear nuevas alternativas preventivas o curativas, que contribuyan a evitar o eliminar las infecciones causadas por este organismo.

"Chronicity," "nervios" and community care: a case study of Puerto Rican psychiatric patients in New York City.

Science.gov (United States)

Swerdlow, M

1992-06-01

The role of ethnicity, community structure, and folk concepts of mental illness in facilitating the adaptation of long term psychiatric patients to community living has received little attention. This article examines the cultural concepts of mental illness and the community involvement of 30 Puerto Rican psychiatric patients participating in a New York City treatment program. It is shown that many of the attributes usually associated with chronic mental illness do not apply to this population. It is argued that the folk concept of nervios helps to foster the integration of these patients in a wide range of community networks. The impact of gentrification on these patients' community integration is also discussed.

Estado de la moniliasis del cacao causada por moniliophthora roreri en colombia

OpenAIRE

Correa Alvarez, Javier; Castro Martínez, Sergio; Coy, Jairo

2014-01-01

La Moniliasis es una enfermedad fúngica que ataca el cultivo de cacao, causada por el basidiomycete Mo-niliophthora roreri. Está presente en la mayoría de los países latinoamericanos y se adapta a diversidad de ambientes. En Colombia la enfermedad es devastadora y las estrategias de control tradicional han generado resultados colaterales como el fortalecimiento de la resistencia genética de cepas del hongo en algunas regiones. En esta revisión, se recopilan los aspectos biológicos y agronó...

Ataques de nervios: culturally bound and distinct from panic attacks?

Science.gov (United States)

Keough, Meghan E; Timpano, Kiara R; Schmidt, Norman B

2009-01-01

The Diagnostic and Statistical Manual of Mental Disorders [DSM-IV-TR; American Psychiatric Association [APA], 2000) has emphasized the importance of understanding psychopathology within a cultural framework by including culture-bound syndromes within its appendices. These syndromes are proposed to be bound to certain cultures and distinct from other psychological disorders. Included among the syndromes are ataques de nervios (ADN), which are reported to be bound to the Hispanic culture and closely resemble panic attacks. However, the cultural distinctiveness and phenomenology of ADN has not been adequately investigated. The current study employed an ethnically diverse study sample (N=342) of undergraduates. Participants completed a number of measures that assessed acculturation, syndrome and anxiety risk factors. In contrast to the DSM-IV's conceptualization of ADN, the rate of ADN did not significantly vary across the three main groups (African American, Caucasian, and Hispanic participants) nor did it vary based on acculturation. More consistent with the DSM-IV, the symptom comparisons indicated some differentiation between ADN and panic attacks. The present report provides data indicating that ADNs, as described by the DSM-IV, are not unique to the Hispanic culture and are experienced by non-Hispanic individuals at similar rates to Hispanic-endorsement. The findings are consistent with the DSM-IV assertion that ADNs and PAs are distinct syndromes. (c) 2008 Wiley-Liss, Inc.

Lesiones del nervio torácico largo de Bell. Revisión de conceptos terapéuticos

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Sebastián E. Valbuena

2014-03-01

Full Text Available Re­su­men las lesiones del nervio torácico producen parálisis del serrato anterior y originan una deformidad característica (escápula alata, que genera debilidad y alteraciones importantes en la movilidad del hombro. En esta revisión, se analizan conceptos sobre anatomía, etiología, presentación clínica y alternativas terapéuticas. Long­ thoracic ­nerve ­of ­Bell. ­Review­ of­ therapeutic ­management Abstract The long thoracic nerve injuries are manifested by a characteristic deformity called scapula alata, causing weakness, and impaired shoulder mobility. in this review current concepts of the anatomy, etiology, clinical presentation and therapeutic management are analyzed.

Ataques de Nervios and their psychiatric correlates in Puerto Rican children from two different contexts.

Science.gov (United States)

López, Irene; Rivera, Fernando; Ramirez, Rafael; Guarnaccia, Peter J; Canino, Glorisa; Bird, Héctor R

2009-12-01

Among Latino adults and children, ataques de nervios has been associated with an array of psychiatric disorders. Using data from a probability sample of Puerto Rican children, aged 5 to 13 years (N = 2491), we assessed the lifetime prevalence and psychiatric correlates of ataques in youth residing in the South Bronx, New York and San Juan, Puerto Rico. Baseline site comparisons indicated that between 4% and 5% of children had a lifetime prevalence of ataques (either by child or parent report) and that ataques were associated with greater global impairment and a host of childhood disorders within the previous twelve months. Ataques were also correlated with greater exposure to violence, as well as more stressful life events for the South Bronx sample. After controlling for several covariates, ataques continued to be significantly associated with psychopathology. Ataques are, therefore, a significant correlate of global impairment and childhood psychopathology among Puerto Rican youth.

Maculopatía relacionada con la foseta del nervio óptico

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Raisa Ivis Beltrán Sainz

Full Text Available Se realizó una revisión bibliográfica con el objetivo de ampliar el conocimiento sobre la maculopatía relacionada con la foseta del nervio óptico, su fisiopatología, así como sus principales manifestaciones, diagnóstico clínico, angiográfico y por tomografía de coherencia óptica, y describir algunos de los tratamientos que se han utilizado recientemente a nivel mundial. Se tuvieron en cuenta las tendencias actuales de tratamiento. Se consultaron fundamentalmente artículos científicos de revistas publicados en las bases de datos PubMED y Cochrane, así como textos básicos que abordan este tema en los últimos 5 años, a través de Google como motor de búsqueda. A pesar de que se trata de una enfermedad infrecuente, su manejo suele resultar difícil, especialmente cuando existe afectación macular. En nuestro trabajo constatamos que la mayoría de los estudios utilizan muestras pequeñas, son retrospectivos, no comparativos y no ramdomizados. Sin embargo, se encontraron modalidades de tratamiento que han sido utilizadas por años y más recientemente descripciones de nuevas técnicas que requerirán futuros estudios. No existe un consenso sobre un protocolo ideal de tratamiento para esta entidad.

Los títulos de créditos en el cine de Pedro Almodóvar: Un caso ejemplar: Mujeres al borde de un ataque de nervios

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Jean-Pierre Castellani

2009-12-01

Full Text Available Bien es conocida la voluntad permanente en en un director como Pedro Almodóvar de utilizar lo más posible las posibilidades específicas del lenguaje cinematográfico y de trabajar todos los segmentos del discurso del cine. Por eso, desde sus primeras películas, Almodóvar ha cuidado mucho los dos umbrales del relato filmico que son los títulos de créditos de principio y de final. Uno de los ejemplos más significativos al particular es el de Mujeres al borde de un ataque de nervios que nos proponemos estudiar detenidamente al mismo tiempo que nos servirá como representación del mensaje esencial de la película._____________________ABSTRACT:We know that Almodovar is a director who thrives at using all the specific means put at his disposal by the cinematic language. That is why, ever since the first movies he directed; Almodovar has paid particular care at the beginning and the ending of the movie, creating crafted opening and closing credits. We find one of the most significative examples in Mujeres al borde de un ataque de nervios that we propose to study now as well as extracting its key messages.

Salmonella causada por reptiles y anfibios en guarderías (Salmonella Infections Caused by Reptiles and Amphibians in Childcare Centers)

Centers for Disease Control (CDC) Podcasts

Traducción al español de la entrevista con el Dr. Neil Vora, funcionario del EIS de los CDC, sobre su artículo acerca de las infecciones por Salmonella causadas por reptiles y anfibios en guarderías.

Internal antecubital fold line: A new useful anatomical repair to identify the medial epicondyle and avoid iatrogenic ulnar nerve injury in patients with supracondylar fracture of the humerus Línea del pliegue antecubital interno: Un nuevo reparo anatómico útil para identificar la epitróclea y evitar lesiones iatrogénicas del nervio ulnar en pacientes con fractura supracondílea del humero

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Luis José Cespedes

2012-12-01

ógrados cruzados, proporcionan la mejor estabilidad mecánica. La mayoría de los niños con fractura supracondílea presentan inflamación alrededor del codo, haciendo difícil la palpación de la epítroclea, aumentando el riesgo de lesión del nervio cubital. Objetivo: evaluar la correspondencia de la línea del pliegue antecubital interno con la epitróclea en pacientes con fractura supracondílea y la incidencia de las lesiones iatrogénicas del nervio cubital. Metodología: Realizamos una serie de casos clínicos. El primer grupo incluyó 56 niños con fractura supracondílea tipo III de Gartland, entre agosto de 2000 a septiembre de 2007, tratados con reducción cerrada y fijación con clavos cruzados retrógrados. El segundo grupo incluyó 241 (481 codos pacientes de consulta externa. En ambos grupos utilizamos la línea antecubital interna para identificar la epitróclea. Resultados: La prolongación de la línea del pliegue antecubital intersecó la epitróclea en todos los participantes del primer grupo. No hubo lesión iatrogénica del nervio cubital. En el segundo grupo la línea del pliegue antecubital intersecó la epitróclea en el 96.3% de los pacientes. Ningún paciente presentó lesión del nervio cubital. Conclusiones: La extensión de la línea de pliegue antecubital interno puede ser útil para la identificación de la epitróclea y así evitar lesiones iatrogénicas del nervio cubital. Salud UIS 2012; 44 (2: 9-14

Neurofibromatosis tipo 1 asociado a tumor maligno de la vaina de nervio periférico y a carcinoma de colon

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Rubén Valle

2009-09-01

Full Text Available La neurofibromatosis tipo 1 es una enfermedad autosómica dominante, producida por la mutación del gen de la neurofibrina, localizado en el cromosoma 17q11.2. Esta enfermedad presenta una diversidad de manifestaciones clínicas y predisposición al desarrollo de tumores, lo cual explica la elevada mortalidad. Presentamos el caso de una paciente con diagnóstico de neurofibromatosis tipo 1, quién desarrolló un tumor maligno de la vaina del nervio periférico y cáncer de colon. Se revisa la literatura y los factores clínicos, de imagen e histológicos que se asocian a la transformación maligna de los neurofibromas.

TOPOGRAFÍA INTRANEURAL DE LA RAMA PROFUNDA DEL NERVIO ULNAR EN EL ANTEBRAZO DISTAL: ESTUDIO CADAVÉRICO. Intraneural topography of the deep branch of the ulnar nerve in the distal forearm: cadaveric study.

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Joaquín García Pisón

2016-07-01

Full Text Available Objetivo: estudiar la topografía intraneural de la rama profunda del nervio ulnar (RPNU en el antebrazo distal en vistas a su identificación mediante disección intraneural mínima durante la transferencia del nervio del pronador cuadrado (NPC a la RPNU. Materiales y métodos: En 15 antebrazos cadavéricos se fijó el paquete vasculonervioso ulnar a los planos musculares profundos cada un centímetro tomando como referencia el hueso pisiforme. Se disecó en sentido proximal la RPNU bajo microscopio quirúrgico (Olympus OME, 4-20x y se registró su posición intraneural en base a una división en cuadrantes. Se midió la distancia desde el origen de la rama cutánea dorsal (RCD del nervio ulnar al pisiforme y se registró su relación intraneural con la RPNU. Resultados: La RPNU se individualizó hasta 69mm (41-94 proximal al hueso pisiforme, ubicándose en el cuadrante posteromedial del nervio ulnar en el 78% (67-87, el 93% (92-93 y el 100% de los casos entre los 0-2, 3-6 y 7-9 centímetros, respectivamente. La distancia pisiforme-RCD fue de 63mm (52-83. En 11 miembros la disección de la RPNU se extendió proximalmente al origen de la RCD, ubicándose siempre entre esta última y la rama superficial del nervio ulnar. Conclusiones: La topografía intraneural de la RPNU en el sitio óptimo para su sección en vistas a su anastomosis con el NPC es predecible en la mayoría de los casos, lo que confirma la viabilidad de su identificación precisa mediante disección intraneural mínima.  Objective: to assess the intraneural anatomy of the deep branch of the ulnar nerve (DBUN in the distal forearm in reference to its identification by means of minimal intraneural dissection during pronator quadratus nerve to DBUN transfers. Materials and methods: In 15 cadaveric forearms the ulnar neurovascular bundle was identified and attached to the subjacent muscles every one centimeter. Pisiform bone was used as reference. Intraneural proximal dissection of

Mastite bovina causada por Staphylococcus spp. resistentes à meticilina: revisão de literatura

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José Givanildo Silva

Full Text Available RESUMO: Staphylococcus spp. são os micro-organismos mais relacionados a casos de mastite bovina. Algumas cepas destes micro-organismos têm apresentado fatores de virulência como genes de resistência a antimicrobianos com destaque para a resistência à meticilina que é um problema de saúde pública. Esta revisão de literatura tem o objetivo de compilar dados sobre a mastite bovina causada por Staphylococcus spp. resistente à meticilina (MRS. Apesar desse antimicrobiano não ser comumente utilizado no tratamento das mastites, a frequência de casos de infecção da glândula mamária causada por MRS tem variado entre 1,34 a 47,6%. Acredita-se que o contato dos humanos com animais positivos para MRS e vice-versa favoreça a transmissão deste patógeno entre as espécies, contribuindo para a variação nas taxas de infecção. A detecção de MRS pode ser realizada por meio de provas fenotípicas, moleculares ou sorológicas e as medidas de controle devem contemplar a identificação dos casos, segregação dos animais, estudo epidemiológico da fonte de infecção do rebanho, além da constante limpeza e higienização do ambiente de confinamento, equipamentos e utensílios de ordenha. Casos de mastite ocasionados por esse patógeno assumem relevância para a saúde pública, pois a ingestão de leite e/ou derivados contaminados podem desencadear a transferência de MRS para seres humanos. Com isso, é necessário um alerta constante quanto à vigilância epidemiológica em fazendas leiteiras.

Ações do enfermeiro na identificação precoce de alterações sistêmicas causadas pela sepse grave

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Felipe Garrido

2017-04-01

Full Text Available Introdução: As unidades de terapia intensiva (UTIs têm sido organizadas como setores estratégicos para o suporte especializado de assistência ao paciente grave. Objetivo: Verificar as ações do enfermeiro para a identificação precoce das alterações sistêmicas causadas pela sepse grave relacionadas às alterações hemodinâmicas, neurológicas, respiratórias, renais e nutricionais dos pacientes internados em UTIs adulto. Métodos: Estudo descritivo com 24 enfermeiros. Os dados foram coletados por meio de formulário composto de questões estruturadas. Resultados: Apenas 36% dos enfermeiros possuem especialização em UTI adulto; verificou-se que os profissionais identificam parcialmente os sinais e sintomas apresentados pelo paciente séptico. Conclusão: Os enfermeiros encontram dificuldade na identificação precoce das alterações sistêmicas causadas pela sepse grave relacionada às alterações hemodinâmicas, neurológicas, respiratórias, renais e nutricionais dos pacientes internados em UTI adulto, o que pode estar relacionado com a falta de treinamento e de protocolos estabelecidos pelas instituições.

Costo económico de la discapacidad causada por lesiones de tránsito en México durante 2012

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Patricia G. Sánchez-Vallejo

2015-04-01

Full Text Available Para estimar el costo económico de la discapacidad permanente causada por lesiones de tránsito en México durante 2012, desde las perspectivas del Sistema de Salud y de la Sociedad, se realizó un estudio de costos que utiliza metodología bottom-up, considerando costos directos médicos (hospitalización, consultas ambulatorias y de rehabilitación y prótesis, y costos indirectos (pérdida de productividad del lesionado y cuidador con una aproximación de capital humano. La discapacidad causada por lesiones de tránsito tiene un alto costo para el sistema de salud y la sociedad mexicana. Desde la perspectiva del sistema de salud, el costo en pesos mexicanos de la discapacidad permanente fue de US$269.529.480,72, equivalente a US$1.496,33 por persona. Desde la perspectiva de la sociedad, se estimaron US$3.445,45 durante el primer año. En promedio, se estimó un costo total de US$4.941,77 por persona, resultando en un total de US$1.119.761.632,53 en 2012. Los resultados de este estudio evidencian la necesidad de diseñar e implementar políticas más enérgicas y eficientes para el control de las lesiones de tránsito en México

Ecografía musculo-esquelética como herramienta diagnóstica en lesiones causadas por vertebrados e invertebrados

OpenAIRE

Boadas Morales, Jesús; Marcano Arismendi, Jenny

2014-01-01

Los accidentes causados por organismos vertebrados e invertebrados representan un motivo de consulta importante a nivel mundial, por ello las técnicas diagnósticas y los esquemas de tratamiento deben ser actualizados constantemente. La ecografía representa una herramienta útil para la evaluación de las lesiones de partes blandas causadas por el contacto con animales venenosos de diferentes grupos zoológicos. Este trabajo representa el primer paso para futuras investigaciones que integren el c...

Ataques de nervios and somatic complaints among island and mainland Puerto Rican children.

Science.gov (United States)

Lopez, Irene; Ramirez, Rafael; Guarnaccia, Peter; Canino, Glorisa; Bird, Hector

2011-06-01

Previous research has documented the association between the Latino cultural idiom of distress, ataques de nervios (i.e., "attacks of nerves"), and unexplained neurological symptoms among adults. However, the associations between ataques and somatic complaints in children have not been sufficiently explored. In this study, we assessed the relation between this anxiety-related experience, henceforth ataques, and somatic complaints in a probability sample of Puerto Rican youth, ages 5-13 years, living in San Juan, Puerto Rico (N = 1353) and in the South Bronx, New York (N = 1138). When both sites were combined, children with ataques were significantly more likely to have either a lifetime prevalence of asthma or headaches, and tended to have more stomach aches and a history of epilepsy or seizure than children without ataques. Further within site analyses showed a similar patterning of complaints for the South Bronx sample as for the combined sample. However, children in San Juan with ataques were only slightly more likely to experience headaches, and at risk for injury, than those without ataques. In addition, comparisons between ataque sufferers across sites indicated that children in San Juan with ataques were at elevated risk for serious illness or injury in comparison to those in the South Bronx with ataques. Ataques are significantly associated with a wide range of physical complaints in Puerto Rican youth. However, their pattern of associations differs by context. © 2010 Blackwell Publishing Ltd.

Salmonella causada por reptiles y anfibios en guarderías (Salmonella Infections Caused by Reptiles and Amphibians in Childcare Centers)

Centers for Disease Control (CDC) Podcasts

2013-02-07

Traducción al español de la entrevista con el Dr. Neil Vora, funcionario del EIS de los CDC, sobre su artículo acerca de las infecciones por Salmonella causadas por reptiles y anfibios en guarderías.  Created: 2/7/2013 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID).   Date Released: 2/26/2013.

Azúcar y nervios: explanatory models and treatment experiences of Hispanics with diabetes and depression.

Science.gov (United States)

Cabassa, Leopoldo J; Hansen, Marissa C; Palinkas, Lawrence A; Ell, Kathleen

2008-06-01

This study examined the explanatory models of depression, perceived relationships between diabetes and depression, and depression treatment experiences of low-income, Spanish-speaking, Hispanics with diabetes and depression. A purposive sample (n=19) was selected from participants enrolled in a randomized controlled trial conducted in Los Angeles, California (United States) testing the effectiveness of a health services quality improvement intervention. Four focus groups followed by 10 in-depth semi-structured qualitative interviews were conducted. Data were analyzed using the methodology of coding, consensus, co-occurrence, and comparison, an analytical strategy rooted in grounded theory. Depression was perceived as a serious condition linked to the accumulation of social stressors. Somatic and anxiety-like symptoms and the cultural idiom of nervios were central themes in low-income Hispanics' explanatory models of depression. The perceived reciprocal relationships between diabetes and depression highlighted the multiple pathways by which these two illnesses impact each other and support the integration of diabetes and depression treatments. Concerns about depression treatments included fears about the addictive and harmful properties of antidepressants, worries about taking too many pills, and the stigma attached to taking psychotropic medications. This study provides important insights about the cultural and social dynamics that shape low-income Hispanics' illness and treatment experiences and support the use of patient-centered approaches to reduce the morbidity and mortality associated with diabetes and depression.

Corrosividade causada por soluções produzidas com creosoto vegetal

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Paes Juarez Benigno

2002-01-01

Full Text Available Esta pesquisa teve como objetivo avaliar a corrosividade de soluções preservativas preparadas com creosoto vegetal. Por destilação do alcatrão vegetal, obteve-se o creosoto vegetal bruto, recuperado à temperatura de 110-255 masculineC. Uma fração deste destilado foi lavada com solução a 9% de bicarbonato de sódio, obtendo-se o creosoto vegetal purificado. Ambas as frações foram enriquecidas com 3% de naftenato de cobre; 3% de naftenato de zinco; 3% de naftenato de cobalto; 2% de TBTO; 2% de tribromofenato de tributil-estanho; 2% de pentaclorofenol; ou 0,4% de trióxido de arsênico. Foram preparadas 16 soluções preservativas, sendo 14 enriquecidas, além do creosoto vegetal bruto e do creosoto vegetal purificado. Placas de aço SAE 1006 foram expostas por 6 horas às temperaturas de 25, 45 e 100 masculineC, à ação corrosiva dessas soluções. A corrosividade das soluções de creosoto vegetal foi comparada à corrosividade causada pelo creosoto mineral. As soluções preparadas com creosoto vegetal purificado foram menos corrosivas que suas similares preparadas com creosoto vegetal bruto, sem, no entanto, atingir a baixa corrosividade do creosoto mineral.

“Azúcar y Nervios: Explanatory Models and Treatment Experiences of Hispanics with Diabetes and Depression”

Science.gov (United States)

Hansen, Marissa C; Palinkas, Lawrence A; Ell, Kathleen

2008-01-01

This study examined the explanatory models of depression, perceived relationships between diabetes and depression, and depression treatment experiences of low-income, Spanish-speaking, Hispanics with diabetes and depression. A purposive sample (n =19) was selected from participants enrolled in a randomized controlled trial conducted in Los Angeles, California (US) testing the effectiveness of a health services quality improvement intervention. Four focus groups followed by 10 in-depth semi-structured qualitative interviews were conducted. Data were analyzed using the methodology of coding, consensus, co-occurrence, and comparison, an analytical strategy rooted in grounded theory. Depression was perceived as a serious condition linked to the accumulation of social stressors. Somatic and anxiety-like symptoms and the cultural idiom of nervios were central themes in low-income Hispanics’ explanatory models of depression. The perceived reciprocal relationships between diabetes and depression highlighted the multiple pathways by which these two illnesses impact each other and support the integration of diabetes and depression treatments. Concerns about depression treatments included fears about the addictive and harmful properties of antidepressants, worries about taking too many pills, and the stigma attached to taking psychotropic medications. This study provides important insights about the cultural and social dynamics that shape low-income Hispanics’ illness and treatment experiences and support the use of patient-centered approaches to reduce the morbidity and mortality associated with diabetes and depression. PMID:18339466

Infecções intramamárias causadas por Staphylococcus aureus e suas implicações em paúde pública

OpenAIRE

Fagundes,Helena; Oliveira,Carlos Augusto Fernandes

2004-01-01

Neste trabalho, são apresentados os principais problemas decorrentes das infecções intramamárias (mastites) causadas por Staphylococcus aureus e as conseqüências para a saúde humana da veiculação de suas toxinas através do leite. o S. aureus destaca-se como um dos microorganismos mais importantes que podem ser transmitidos através dos alimentos. Assim, discute-se a possibilidade de veiculação de gastroenterite estafilocócica, não somente através do consumo de leite cru contaminado, mas também...

Estado de la moniliasis del cacao causada por Moniliophthora roreri en Colombia

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Javier Correa Álvarez

2014-12-01

Full Text Available La moniliasis es una enfermedad fúngica que ataca el cultivo de cacao, causada por el basidiomycete Moniliophthora roreri. Está presente en la mayoría de los países latinoamericanos y se adapta a diversidad de ambientes. En Colombia la enfermedad es devastadora y las estrategias de control tradicional han generado resultados colaterales como el fortalecimiento de la resistencia genética de cepas del hongo en algunas regiones. En esta revisión, se recopilan los aspectos biológicos y agronómicos más relevantes del hongo, entre ellos, origen y distribución, ciclo de vida, formas de control y trabajos de investigación realizados con el fin de entender la genética y evolución de este patógeno. Finalmente, se propone incrementar el número de estudios en investigación básica, con miras a entender cómo ha sido la evolución de su genoma en hábitats que favorecen la variación genética. Con este conocimiento se podría avanzar en programas biotecnológicos de control y prevención de la enfermedad.

The Role of Peers in the Relation between Hurricane Exposure and Ataques de Nervios among Puerto Rican Adolescents.

Science.gov (United States)

Rubens, Sonia L; Felix, Erika D; Vernberg, Eric M; Canino, Glorisa

2014-11-01

Although a relation between disaster exposure and ataques de nervios ( ataques ) has been established in adult samples, little is known about this among youth, including factors that may moderate this relation. This study examined the role of the peer context in the relation between exposure to Hurricane Georges and experiencing a past year and lifetime ataques among a representative community sample of 905 youth (N = 476 boys and 429 girls; ages 11-18) residing in Puerto Rico. Data were gathered from 1999-2000 in Puerto Rico, 12-27 months following Hurricane Georges. Logistic regression analyses found that peer violence significantly predicted experiencing an ataque in the past year. Hurricane exposure and peer violence were both significant predictors of a lifetime experience of an ataque . An interaction was found between hurricane exposure and peer violence, indicating that hurricane exposure was significantly related to a lifetime experience of an ataque among adolescents who do not report associating with violent peers. For participants reporting high levels of peer violence, hurricane exposure did not add additional risk for a lifetime experience of an ataque . Understanding the influence of peers in the relation between hurricane exposure and experiencing an ataque may assist in planning developmentally and culturally sensitive response plans.

Primeira ocorrência de ferrugem em capim-limão causada por Puccinia cymbopogonis no Brasil First report of the lemongrass rust fungi caused by Puccinia cymbopogonis in Brazil

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João Batista Vida

2006-03-01

Full Text Available È registrada a primeira ocorrência de ferrugem em capim-limão (Cymbopogon citratus (DC. Stapf, causada por Puccinia cymbopogonis Mass., no Brasil, Estado do Paraná.It is reported the first occurrence of the lemongrass (Cymbopogon citratus (DC. Stapf rust fungi caused by Puccinia cymbopogonis Mass. in Brazil, State of Paraná.

Neuropatía compresiva del nervio interoseo posterior a nivel del codo (síndrome de la arcada de frohse: ¿debe incluirse en el listado de enfermedades profesionales? Must the neuropathy compressive of posterior interoseal nerve at the elbow level (arcade of frohse syndrome: be included in the occupational diseases list?

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Raúl Jesús Regal Ramos

2010-09-01

Full Text Available Introducción: La afectación compresiva del nervio radial se encuentra recogida en el último Listado de Enfermedades Profesionales (LEP, con el código 2F0601. En este apartado no se recoge entre las "principales actividades" capaces de producir afectación del n.radial la compresión de origen laboral más frecuente de este, el síndrome de la Arcada de Frohse (SAF. Objetivos: El objetivo de esta revisión no es solo reflejar que la afectación compresiva del nervio interóseo posterior puede considerarse una Enfermedad Profesional (EP, sino que además debería estar recogida en el actual listado de EP entre las "principales actividades capaces de producir afectación del nervio radial". Metodología: Se han revisado hasta Febrero de 2010 las siguientes bases de datos bibliográficas: Medline, Embase, Cochrane. Resultados: Esta revisión bibliográfica nos permite concluir que: El SAF puede tener un origen laboral (la fibrosis del supinador corto se relaciona con movimientos repetidos de pronación y supinación del antebrazo y esta descrita su mayor prevalencia en determinadas profesiones que realizan estos movimientos. El SAF es la neuropatía compresiva de origen laboral mas frecuente del nervio radial, la más relacionada con los movimientos repetitivos de la mano y antebrazo. La Arcada de Frohse es el lugar más frecuente de compresión del radial. Conclusiones: Por tanto, el SAF puede considerarse una EP, si asocia factores de riesgo laborales suficientes, y debería estar recogido en el LEP por tratarse de la localización más frecuente de compresión de origen laboral del nervio radial.Introduction: The compress affection of radial nerve is included in the last Occupational Diseases List (ODL, with code 2f0601. In this paragraph the Arcade of Frohse syndrome (SAF isn't included among the "main activities" able to induce radial nerve affection, the occupational origin radial nerve compression more frequent. Objectives: The objective

Compactação causada pelo manejo de plantas invasoras em latossolo vermelho-amarelo cultivado com cafeeiros

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Paula Sant'Anna Moreira Pais

2011-12-01

Full Text Available O manejo de plantas invasoras é considerado uma das principais atividades que promovem degradação da estrutura do solo em lavouras cafeeiras, devido à compactação do solo causada pelas operações de controle de plantas invasoras. O objetivo deste estudo foi determinar o modelo de capacidade de suporte de carga para o manejo de plantas invasoras sem capina, bem como, utilizando esse modelo, qual manejo de plantas invasoras causa menor ou maior compactação do solo. Este estudo foi realizado em um Latossolo Vermelho-Amarelo (LVA cultivado com cafeeiros da cutivar Topázio MG 1190 desde 2006, localizado na Fazenda Experimental da EPAMIG, na comunidade Farias, em Lavras-MG. Os manejos de plantas invasoras avaliados foram: na linha de tráfego da entrelinha - grade de discos, herbicida de pós-emergência, herbicida de pré-emergência, roçadora e trincha; e no centro da entrelinha, onde não houve tráfego - amendoim forrageiro (Arachis pintoi, braquiária (Brachiaria decumbens, capina manual, crotalária (Crotalaria juncea e soja (Glicine max L. A amostragem consistiu de duas etapas: uma para determinar o modelo de capacidade de suporte de carga para o manejo de plantas invasoras sem capina; e outra para avaliar a compactação promovida pelos outros manejos de plantas invasoras. A fim de determinar o modelo de capacidade de suporte de carga para o manejo sem capina, foram coletadas no centro da entrelinha 20 amostras com estrutura indeformada nas profundidades de 0-3, 10-13 e 25-28 cm, totalizando 60 amostras. Essas amostras foram submetidas ao ensaio de compressão uniaxial para obter as pressões de pré-consolidação e as umidades volumétricas, que foram usadas para determinar o modelo de capacidade de suporte de carga. Para determinar a compactação causada pelos manejos de plantas invasoras, realizados por meio do controle mecânico, foram coletadas em janeiro de 2010, nas linhas de tráfego das entrelinhas, 180 amostras com

A FERRUGEM ASIÁTICA DA SOJA CAUSADA POR Phakopsora pachyrhizi Sydow e Sydow

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Felipe Rafael Garcés Fiallos

2012-01-01

Full Text Available Os Estados Unidos são o principal produtor mundial de soja, seguido pelo Brasil. A cultura da soja é afetada por 47 doenças já relatadas, entre elas a ferrugem asiática causada pelo fungo biotrófico Phakopsora pachyrhizi Sydow e Sydow. Esta doença pode atingir até 100% de dano e causa perdas no Brasil estimadas em 737,453,718 dólares ao ano. Em função de sua importância, faz-se oportuno uma revisão bibliográfica sobre esta doença, que abordará a sua ocorrência a nível mundial, a sintomatologia, os hospedeiros, a taxonomia e a etiologia do agente causal, efeitos dos fatores climáticos sobre a doença, ciclo biológico do patógeno, progresso e análise temporal, redução na área foliar e nos componentes de rendimento da cultura da soja e as estratégias de manejo integrado da enfermidade. Foi objetivo desta revisão recopilar as informações mais relevantes sobre a ferrugem asiática de modo o mais explicativo e entendível possível para o leitor.

Podridão de raízes causada por Pythium aphanidermatum, em cultivares de alface produzidas em sistema hidropônico

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Zayame Vegette Pinto

2011-12-01

Full Text Available A podridão de raízes, causada por Pythium aphanidermatum e outras espécies de Pythium, é a principal doença da alface cultivada em sistemas hidropônicos no Brasil. O presente trabalho teve como objetivo avaliar quatro cultivares comerciais de alface em relação à sensibilidade a podridão de raízes, causada por P. aphanidermatum. Os estudos foram realizados em placas de Petri contendo ágar-água com plântulas de alface das cultivares crespa (Vera e Verônica e lisa (Regina e Elisa, infestadas ou não com o patógeno. Com as mesmas cultivares foram realizados quatro experimentos em sistemas hidropônicos (Nutrient Film Technique, sendo dois em estufa coberta com plástico e sombrite e dois em estufa coberta apenas com plástico. As plântulas, infectadas ou não com P. aphanidermatum, foram transplantadas para os sistemas infestados ou não. Foi avaliada a severidade da doença e o desenvolvimento das plantas. Todas as cultivares foram suscetíveis à podridão de raízes nos experimentos realizados in vitro e in vivo. A presença do sombrite não reduziu a podridão de raízes em cultivares de alface produzidas no sistema hidropônico. A cultivar Regina apresentou maior massa de matéria seca da parte aérea e das raízes, na presença ou ausência do patógeno, sendo a mais indicada para o cultivo hidropônico na época mais quente do ano.

Avaliação de Trichoderma e de fosfito no controle da murcha-de-esclerócio em feijoeiro causada por Sclerotium rolfsii

OpenAIRE

Pacheco, Klênia Rodrigues

2012-01-01

O feijoeiro (Phaseolus vulgaris) é suscetível a muitas doenças, entre elas, se encontra a murcha-de-esclerócio (podridão do colo) causada por Sclerotium rolfsii. O controle do S. rolfsii ocorre com o auxílio de práticas preventivas e por controle biológico ou químico. O estudo teve como objetivo selecionar e testar isolados de Trichoderma oriundos de solos do DF, avaliar e comparar os Trichoderma spp. selecionados e fosfitos (Cu, Ca, Mg e K) aos fungicidas no controle da murcha-de-esclerócio....

Síndrome hemolítico-urêmica causada por gencitabina em uma paciente jovem com colangiocarcinoma

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John Fredy Nieto-Ríos

2016-06-01

Full Text Available Resumo A gencitabina é um fármaco utilizado no tratamento de vários tipos de neoplasias malignas. Há poucas descrições de associação entre a droga e a síndrome hemolítico-urêmica (SHU, apesar de os pacientes em questão terem ido a óbito em pelo menos 50% dos casos. O presente artigo relata o caso de uma paciente com 25 anos de idade em remissão diagnosticada com colangiocarcinoma que apresentou anemia hemolítica microangiopática acompanhada de insuficiência renal aguda anúrica após cinco ciclos de quimioterapia com gencitabina; as manifestações eram condizentes com SHU causada pelos efeitos colaterais do medicamento. A administração de gencitabina foi interrompida, e a paciente foi tratada com hemodiálise, transfusões de sangue, trocas de plasma, corticosteroides, doxiciclina e rituximabe. Foi atingido um desfecho favorável; mais especificamente, a hemólise foi controlada e a função renal foi plenamente restabelecida.

Parinaud syndrome caused by Bartonella henselae: case report Síndrome de Parinaud causada por Bartonella henselae: relato de caso

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Carlos Alberto Yamashita

1996-12-01

Full Text Available The authors report a case of Parinaud syndrome (conjunctivitis with pre-auricular satellite adenitis caused by Bartonella henselae, the etiologic agent of Cat Scratch Disease. The etiologic assessment of this case was performed by serum indirect immunofluorescence reaction and allowed for a better therapeutics and follow up, avoiding ineffective antibiotics and surgical interventions.Os autores relatam um caso do Síndrome de Parinaud (conjuntivite com adenite satélite pré-auricular causada por Bartonella henselae, o agente etiológico da Doença da Arranhadura do Gato. O esclarecimento etiológico deste caso foi feito através da reação de imunofluorescência indireta o que permitiu um adequado enfoque terapêutico e acompanhamento do paciente, evitando o uso de antibióticos inadequados e intervenções cirúrgicas.

Nitrato-complexes of Y(III), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl) benzimidazole

Energy Technology Data Exchange (ETDEWEB)

Mishra, A; Singh, M P; Singh, V K

1982-05-01

The nitrato-complexes, (Y(PyBzH)/sub 2/(NO/sub 3/)/sub 2/)NO/sub 3/.H/sub 2/O and Nd, Sm, Gd, Tb, Dy, Ho ; n=1-3, m=0-0.5 ; PyBzh=2-(2 -pyridyl)benzimidazole) are formed on interaction of the ligand with metal nitrates in ethanol. The electrical conductance values (116-129 ohm/sup -1/cm/sup 2/mol/sup -1/) suggest 1:1 electrolyte-nature of the complexes. Magnetic moment values of Ce(2.53 B.M.), Pr(3.62 B.M.), Nd(3.52 B.M.), Sm(1.70 B.M.), Gd(8.06 B.M.), Tb(9.44 B.M.), Dy(10.56 B.M.) and Ho(10.51 B.M.) in the complexes confirm the positive state of the metals. Infrared evidences are obtained for the existance of both coordinated (C/sub 2/v) and uncoordinated (D/sub 3/h) nitrate groups. Electronic absorption spectra of Pr(III)-, Nd(III)-, Sm(III)-, Tb(III)-, Dy(III)- and Ho(III)-complexes have been analysed in the light of LSJ terms.

Nitrato-complexes of Y(III), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl) benzimidazole

International Nuclear Information System (INIS)

Mishra, A.; Singh, M.P.; Singh, V.K.

1982-01-01

The nitrato-complexes, [Y(PyBzH) 2 (NO 3 ) 2 ]NO 3 .H 2 O and Nd, Sm, Gd, Tb, Dy, Ho ; n=1-3, m=0-0.5 ; PyBzh=2-(2 -pyridyl)benzimidazole] are formed on interaction of the ligand with metal nitrates in ethanol. The electrical conductance values (116-129 ohm -1 cm 2 mol -1 ) suggest 1:1 electrolyte-nature of the complexes. Magnetic moment values of Ce(2.53 B.M.), Pr(3.62 B.M.), Nd(3.52 B.M.), Sm(1.70 B.M.), Gd(8.06 B.M.), Tb(9.44 B.M.), Dy(10.56 B.M.) and Ho(10.51 B.M.) in the complexes confirm the terpositive state of the metals. Infrared evidences are obtained for the existance of both coordinated (C 2 v) and uncoordinated (D 3 h) nitrate groups. Electronic absorption spectra of Pr(III)-, Nd(III)-, Sm(III)-, Tb(III)-, Dy(III)- and Ho(III)-complexes have been analysed in the light of LSJ terms. (author)

La necrosis bacteriana de la vid, causada por xylophilus ampelinus. Detección serológica, distribución en Aragón y sensibilidad varietal.

OpenAIRE

CAMBRA ALVAREZ, MIGUEL

2011-01-01

La necrosis bacteriana de la vid, causada por la bacteria de cuarentena Xylophilus ampelinus, es una enfermedad de difícil control químico y que ha causado en España importantes pérdidas económicas. Actualmente, es endémica en distintas zonas de Aragón y Galicia y se han identificado focos aislados en La Rioja. Ante la carencia de métodos sensibles y específicos de detección de esta bacteria que se puedan utilizar para el análisis rutinario, se ha puesto a punto un método de ex...

Constrição campimétrica causada por vigabatrin Visual field constriction caused by vigabatrin

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Mário Luiz Ribeiro Monteiro

2000-10-01

Full Text Available Objetivo: Descrever dois pacientes que apresentaram constrição campimétrica importante e determinar a origem desta alteração visual causada pelo uso de vigabatrin, um anticonvulsivante que atua aumentando a concentração do ácido gama-aminobutírico no sistema nervoso central. Métodos: Os pacientes foram submetidos a exame e neuroftalmológico completo, avaliação cuidadosa da retina, campo visual com perímetro de Goldmann, tomografia computadorizada de crânio e órbitas, eletrorretinograma (ERG, imagem por ressonância magnética (1 paciente e potencial visual evocado (1 paciente. Resultados: A acuidade visual se mostrou preservada; o primeiro paciente apresentava campo visual restrito à área central de 20 a 30 graus centrais e o segundo uma constrição leve a moderada. Os exames de neuroimagem foram normais assim como o potencial visual evocado. Observou-se palidez discreta de papila em 3 olhos estudados e estreitamento arteriolar muito discreto dos vasos retinianos. O ERG revelou alterações importantes caracterizada por redução da onda b (caso 1 e dos potenciais oscilatórios (caso 2. Conclusões: As alterações visuais causadas pelo vigabatrin são devidas a uma alteração retiniana, envolvendo provavelmente as células amácrimas, bipolares e ganglionares mas não se acompanham de uma alteração significativa à fundoscopia. Pacientes recebendo esta medicação devem ser seguidos de perto especialmente através da avaliação do campo visual central e periférico.Purpose: To describe two patients who presented with severe campimetric constriction and to determine the source of visual symptoms caused by vigabatrin, an anticonvulsant medication that increases brain gamma-aminobutyric acid. Methods: Patients were submitted to a complete neuroophthalmologic evaluation as well as a careful retina examination, Goldmann perimetry, computerized tomography of the brain and orbits, electroretinograms (ERG, magnetic ressonance

Isothiocyanato complexes of Gd(III), Tb(III), Dy(III) and Ho(III) with 2-(2'-pyridyl)benzimidazole

Energy Technology Data Exchange (ETDEWEB)

Mishra, A; Singh, V K

1982-01-01

Six-coordinated complexes of the type (Ln(PyBzH)/sub 2/NCS.H/sub 2/O) (NCS)/sub 2/.nH/sub 2/O/mC/sub 2/H/sub 5/OH (Ln = Gd(III), Tb(III), Dy(III) and Ho(III), n=1-2; m=1) have been prepared from Ln(NCS)/sub 6//sup 3 -/. The room temperature magnetic moment values confirm the terpositive state of the lanthanide ions. Infrared spectra suggest the N-coordination of thiocyanate group. Electronic spectral studies of Tb(III), Dy(III) and Ho(III) complexes have been made in terms of LSJ term energies. 13 refs.

Complexation of trivalent actinides and lanthanides with hydrophilic N-donor ligands for Am(III)/Cm(III) and An(III)/Ln(III) separation; Komplexierung von trivalenten Actiniden und Lanthaniden mit hydrophilen N-Donorliganden zur Am(III)/Cm(III)- bzw. An(III)/Ln(III)-Trennung

Energy Technology Data Exchange (ETDEWEB)

Wagner, Christoph

2017-07-24

The implementation of actinide recycling processes is considered in several countries, aiming at the reduction of long-term radiotoxicity and heat load of used nuclear fuel. This requires the separation of the actinides from the fission and corrosion products. The separation of the trivalent actinides (An(III)) Am(III) and Cm(III), however, is complicated by the presence of the chemically similar fission lanthanides (Ln(III)). Hydrophilic N-donor ligands are employed as An(III) or Am(III) selective complexing agents in solvent extraction to strip An(III) or Am(III) from an organic phase loaded with An(III) and Ln(III). Though they exhibit excellent selectivity, the complexation chemistry of these ligands and the complexes formed during solvent extraction are not sufficiently characterized. In the present thesis the complexation of An(III) and Ln(III) with hydrophilic N-donor ligands is studied by time resolved laser fluorescence spectroscopy (TRLFS), UV/Vis, vibronic sideband spectroscopy and solvent extraction. TRLFS studies on the complexation of Cm(III) and Eu(III) with the Am(III) selective complexing agent SO{sub 3}-Ph-BTBP (tetrasodium 3,3{sup '},3'',3{sup '''}-([2,2{sup '}-bipyridine]-6,6{sup '}-diylbis(1,2,4-triazine-3,5,6-triyl)) tetrabenzenesulfonate) revealed the formation of [M(SO{sub 3}-Ph-BTBP){sub n}]{sup (4n-3)-} complexes (M = Cm(III), Eu(III); n = 1, 2). The conditional stability constants were determined in different media yielding two orders of magnitude larger β{sub 2}-values for the Cm(III) complexes, independently from the applied medium. A strong impact of ionic strength on the stability and stoichiometry of the formed complexes was identified, resulting from the stabilization of the pentaanionic [M(SO{sub 3}-Ph-BTBP){sub 2}]{sup 5-} complex with increasing ionic strength. Thermodynamic studies of Cm(III)-SO{sub 3}-Ph-BTBP complexation showed that the proton concentration of the applied medium impacts

Complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III)

International Nuclear Information System (INIS)

Ferenc, W.; Bernat, M; Gluchowska, H.W.; Sarzynski, J.

2010-01-01

The complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) have been synthesized as polycrystalline hydrated solids, and characterized by elemental analysis, spectroscopy, magnetic studies and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have the following colours: violet for Nd(III), white for Gd(III) and cream for Ho(III) compounds. The carboxylate groups bind as bidentate chelating (Ho) or bridging ligands (Nd, Gd). On heating to 1173K in air the complexes decompose in several steps. At first, they dehydrate in one step to form anhydrous salts, that next decompose to the oxides of respective metals. The gaseous products of their thermal decomposition in nitrogen were also determined and the magnetic susceptibilities were measured over the temperature range of 76-303K and the magnetic moments were calculated. The results show that 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) are high-spin complexes with weak ligand fields. The solubility value in water at 293K for analysed 4-chlorophenoxyacetates is in the order of 10 -4 mol/dm 3 . (author)

Compactação do solo causada por tratores florestais na colheita de Pinus taeda L. na região sudoeste do Paraná

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Denise Andréia Szymczak

2014-08-01

Full Text Available A compactação vem-se tornando um dos principais impactos causados ao solo pelas atividades de colheita florestal mecanizada. O peso e movimentação das máquinas no momento do corte e extração da madeira, aliados à condição de umidade do solo imprópria para tal, são as principais causas da degradação estrutural do solo, verificada, principalmente, por alterações em suas propriedades físicas. Nesse sentido, este trabalho visou identificar a compactação causada ao solo devido às operações de colheita florestal de Pinus taeda L. realizada em três diferentes níveis de umidade do terreno. O estudo foi realizado em área de uma empresa florestal localizada no Paraná sobre Latossolo Vermelho. Os tratamentos foram compostos pela interação de três fatores, sendo eles: umidade (colheita em dia chuva, três e sete dias após a chuva, operações de colheita (com passagem de máquinas, sem passagem/eventual queda de árvores e estaleiro, e a ocasião de coleta (antes e depois da colheita. A biomassa residual da colheita florestal foi essencial para minimizar a compactação do solo causada pelo tráfego das máquinas que foi próxima da máxima. A gradação de umidade representada pela colheita em diferentes números de dias após uma chuva não influenciou, de maneira diferenciada, a compactação do solo. Entretanto, as operações de colheita impactaram o solo até a profundidade de 10 cm, causando a compactação nas linhas de tráfego das máquinas, enquanto as demais operações não provocaram alterações na densidade, macroporosidade e resistência à penetração.

Injúrias causadas por mosca-das-frutas sul-americana em cultivares de videira

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Marcelo Zart

2011-01-01

Full Text Available A mosca-das-frutas sul-americana, Anastrepha fraterculus (Wiedemann (Diptera: Tephritidae, é uma das principais pragas da fruticultura no Brasil. O objetivo deste estudo foi identificar a suscetibilidade quanto à queda e deformação de bagas de diferentes cultivares/espécies de uva pela injúria causada pela oviposição de A. fraterculus. O trabalho foi realizado em vinhedos das cultivares 'Cabernet Sauvignon' (Vitis vinifera, 'Moscato Embrapa' (75% de V. vinifera e 'Isabel' (Vitis labrusca, localizados em Bento Gonçalves (RS, na safra 2006/2007. Dois casais de A. fraterculus foram confinados por cacho, em gaiolas de tecido voile, durante os estádios fenológicos de grão ervilha, início da compactação, início da maturação e maturação plena dos cachos. Queda significativa de bagas devido ao ataque de A. fraterculus foi registrada na cultivar 'Cabernet Sauvignon' quando a infestação foi realizada nos estádios fenológicos de grão ervilha e início da compactação de cacho; estádios de grão ervilha em 'Moscato Embrapa'; e nos estádios de grão ervilha, início da compactação e início da maturação do cacho na cultivar 'Isabel'. Foi registrada deformação de bagas quando as infestações foram realizadas nos estádios de grão ervilha e início da compactação de cacho em 'Cabernet Sauvignon', 'Moscato Embrapa' e 'Isabel'. O desenvolvimento larval até a fase de pupa foi observado somente na cultivar 'Moscato Embrapa'.

Lesiones altas del plexo braquial. Reconstrucción con técnicas combinadas de neurotización e injertos nerviosos.

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enrique manuel vergara amador

2015-01-01

Full Text Available Las lesiones altas del plexo braquial  son  reconstruidas  con neurotización e  injerto nervioso. El  nervio espinal accesorio,  la raíz   C7,  ramas del tríceps, y  el nervio mediano y cubital son los más  usados para transferencias. Se muestra la experiencia con  neurotización de la rama inferior del nervio espinal accesorio (NEA al nervio supraescapular (NSE, transferencia nerviosa de fascículos del nervio cubital o del mediano, y en ocasiones  injertos nervioso hacia el nervio musculocutáneo  y al tronco posterior, y reconstrucción del nervio axilar  en algunos casos. Materiales y métodos Se revisan 42  pacientes  con  lesiones altas de plexo braquial, operados  mediante combinación de   neurotización  e injertos nerviosos. Seguimiento mínimo de 15 meses. Resultados  40 pacientes fueron por accidente en moto. En 22 se  transfirió únicamente el NSE con el NEA, recuperando  abducción de hombro  de 33º  En 8  pacientes  que se combinó con reparación del axilar, mejoró la abducción a 81º. En 30 pacientes con neurotización del nervio cubital o mediano para el bíceps, se obtuvo respuesta  entre 3 y 4 meses. Al  final  flexión  del codo de 116º y M4. Discusión Los mejores resultados  en  hombro  fueron con la combinación  de NSE y del nervio axilar, logrando 81º de abducción. La rotación externa  mejoro  en 28.5% de los pacientes, siendo una respuesta tardía La neurotización  del bíceps con fascículos del cubital consiguió una flexión    de 116º, muy  comparable con otras series. Hoy  esta técnica es el  gold estándar   para la reconstrucción de  flexión del codo.

Formation constants of Sm(III), Dy(III), Gd(III), Pr(III) and Nd(III) complexes of tridentate schiff base, 2-[(1H-benzimidazol-2-yl-methylene) amino] phenol

International Nuclear Information System (INIS)

Omprakash, K.L.; Chandra Pal, A.V.; Reddy, M.L.N.

1982-01-01

A new tridentate schiff base, 2- (1H-benzimidazol-2-yl-methylene)amino phenol derived from benzimididazole-2-carbo-xaldehyde and 2-aminophenol has been synthesised and characterised by spectral and analytical data. Proton-ligand formation constants of the schiff base and metal-ligand formation constants of its complexes with Sm(III), Dy(III), Gd(III), Nd(III) and Pr(III) have been determined potentiometrically in 50% (v/v) aqueous dioxane at an ionic strength of 0.1M (NaClO 4 ) and at 25deg C using the Irving-Rossotti titration technique. The order of stability constants (logβ 2 ) is found to be Sm(III)>Dy(III)>Gd(III)>Pr(III)>Nd(III). (author)

Formation constants of Sm(III), Dy(III), Gd(III), Pr(III) and Nd(III) complexes of tridentate schiff base, 2-((1H-benzimidazol-2-yl-methylene) amino) phenol

Energy Technology Data Exchange (ETDEWEB)

Omprakash, K L; Chandra Pal, A V; Reddy, M L.N. [Osmania Univ., Hyderabad (India). Dept. of Chemistry

1982-03-01

A new tridentate schiff base, 2- (1H-benzimidazol-2-yl-methylene)amino phenol derived from benzimididazole-2-carbo-xaldehyde and 2-aminophenol has been synthesised and characterised by spectral and analytical data. Proton-ligand formation constants of the schiff base and metal-ligand formation constants of its complexes with Sm(III), Dy(III), Gd(III), Nd(III) and Pr(III) have been determined potentiometrically in 50% (v/v) aqueous dioxane at an ionic strength of 0.1M (NaClO/sub 4/) and at 25deg C using the Irving-Rossotti titration technique. The order of stability constants (log..beta../sub 2/) is found to be Sm(III)>Dy(III)>Gd(III)>Pr(III)>Nd(III).

Spectrophotometric and pH-Metric Studies of Ce(III, Dy(III, Gd(III,Yb(III and Pr(III Metal Complexes with Rifampicin

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A. N. Sonar

2011-01-01

Full Text Available The metal-ligand and proton-ligand stability constant of Ce(III, Dy(III, Gd(III,Yb(III and Pr(III metals with substituted heterocyclic drug (Rifampicin were determined at various ionic strength by pH metric titration. NaClO4 was used to maintain ionic strength of solution. The results obtained were extrapolated to the zero ionic strength using an equation with one individual parameter. The thermodynamic stability constant of the complexes were also calculated. The formation of complexes has been studied by Job’s method. The results obtained were of stability constants by pH metric method is confirmed by Job’s method.

Complexes of lanthanum(III), cerium(III), samarium(III) and dysprosium(III) with substituted piperidines

Energy Technology Data Exchange (ETDEWEB)

Manhas, B S; Trikha, A K; Singh, H; Chander, M

1983-11-01

Complexes of the general formulae M/sub 2/Cl/sub 6/(L)/sub 3/.C/sub 2/H/sub 5/OH and M/sub 2/(NO/sub 3/)/sub 6/(L)/sub 2/.CH/sub 3/OH have been synthesised by the reactions of chlorides and nitrates of La(III), Ce(III), Sm(III) and Dy(III) with 2-methylpiperidine, 3-methylpiperidine and 4-methylpiperidine. These complexes have been characterised on the basis of their elemental analysis, and IR and electronic reflectance spectra. IR spectral data indicate the presence of coordinated ethanol and methanol molecules and bidentate nitrate groups. Coordination numbers of the metal ions vary from 5 to 8. 19 refs.

Ocorrência de doenças causadas por molicutes e por vírus em milho nas Províncias de Tucumán e de Córdoba na Argentina

OpenAIRE

GIMÉNEZ PECCI, MARIA P.; OLIVEIRA, ELIZABETH DE; RESENDE, RENATO O.; LAGUNA, IRMA G.; CONCI, LUÍS R; AVILA, ANSELMO; HERRERA, PATRÍCIA; GALDEANO, ERNESTINA; VIRLA, EDUARDO; NOME, CLÁUDIA F.

2002-01-01

A incidência de doenças causadas por molicutes e por vírus foi avaliada em lavouras de milho (Zea mays) nas Províncias de Tucumán e de Córdoba, na Argentina, em fevereiro de 2000. Na Província de Tucumán verificou-se que 44% das lavouras apresentaram altos níveis de incidência de plantas com sintomas de enfezamentos causados por molicutes (50 a 100%), em altitudes variando de 300 a 2.000 m. A presença de fitoplasma e de espiroplasma foi confirmada em amostras de folhas de plantas com sintomas...

Inner-sphere and outer-sphere complexes of yttrium(III), lanthanum (III), neodymium(III), terbium(III) and thulium(III) with halide ions in N,N-dimethylformamide

International Nuclear Information System (INIS)

Takahashi, Ryouta; Ishiguro, Shin-ichi

1991-01-01

The formation of chloro, bromo and iodo complexes of yttrium(III), and bromo and iodo complexes of lanthanum(III), neodymium(III), terbium(III) and thulium(III) has been studied by precise titration calorimetry in N,N-dimethylformamide (DMF) at 25 o C. The formation of [YCl] 2+ , [YCl 2 ] + , [YCl 3 ] and [YCl 4 ] - , and [MBr] 2+ and [MBr 2 ] + (M = Y, La, Nd, Tb, Tm) was revealed, and their formation constants, enthalpies and entropies were determined. It is found that the formation enthalpies change in the sequence ΔH o (Cl) > ΔH o (l), which is unusual for hard metal (III) ions. This implies that, unlike the chloride ion, the bromide ion forms outer-sphere complexes with the lanthanide(III) and yttrium(III) ions in DMF. Evidence for either an inner- or outer-sphere complex was obtained from 89 Y NMR spectra for Y(ClO 4 ) 3 , YCl 3 and YBr 3 DMF solutions at room temperature. (author)

Toxicidade ocular causada pelo tamoxifeno: relato de caso Ocular toxicity caused by tamoxifen: case report

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Eliane Terumi Inada

2005-08-01

Full Text Available O objetivo desse trabalho é relatar um caso de toxicidade ocular pelo tamoxifeno. Para isso, aferiu-se a melhor acuidade visual corrigida de ambos os olhos em tabela de Snellen. Foram realizados biomicroscopia do segmento anterior, refração, oftalmoscopia, angiofluoresceinografia e retinografia numa paciente de 63 anos, sexo feminino, cor branca, em uso de tamoxifeno 20 mg/dia há 4 anos, com acuidade visual corrigida de 20/70 e 20/40. A biomicroscopia do segmento anterior apresentava ceratopatia verticilata e catarata nuclear e cortical posterior de 1+/4 em ambos os olhos. À oftalmoscopia, foi verificado alteração do brilho macular de ambos os olhos. E a angiofluoresceinografia mostrou hiperfluorescência na área macular em fase precoce (defeito em janela. Relata-se um caso de ceratopatia e maculopatia causadas pelo tamoxifeno.To report tamoxifen ocular toxicity. The best visual acuity was measured in both eyes with Snellen chart, slit-lamp examination of anterior segment, refraction, dilated fundus examination, fluorescein angiography and retinography in a 63-year-old patient, female, white, using tamoxifen 20 mg/day for 4 years, with 20/70 and 20/40 corrected visual acuity. The anterior segment examination showed corneal linear subepithelial opacity inferior to the visual axis and nuclear and posterior cortical cataract (1+/4 in both eyes. Fundus examination showed alteration of macular color in both eyes. Fluorescein angiography presented hyperfluorescence in the macular area at an early phase (window defect. Report of keratopathy and maculopathy caused by tamoxifen.

Comparison of two needle models in terms of bevel deformation during truncal block of the inferior alveolar nerve

OpenAIRE

Almendros Marqués, Nieves; Delgado Molina, Esther; Tamarit Borrás, Meritxell; Berini Aytés, Leonardo; Gay Escoda, Cosme

2007-01-01

Objetivos: Evaluar las posibles diferencias existentes en cuanto a la deformación del bisel de dos tipos de aguja de igual longitud y calibre externo, pero de distinto diámetro interno, durante el bloqueo troncal del nervio dentario inferior. Diseño del estudio: Cuatro operadores de similar formación quirúrgica realizaron el bloqueo troncal del nervio dentario inferior y la anestesia infiltrativa del nervio bucal para proceder a la extracción quirúrgica o convencional del tercer molar infe...

Comparação das técnicas transarterial e de estimulação de múltiplos nervos para bloqueio do plexo braquial por via axilar usando lidocaína com epinefrina Comparación de las técnicas transarterial y de estimulación de múltiples nervios para bloqueo del plexo braquial por vía axilar usando lidocaína con epinefrina Comparison of transarterial and multiple nerve stimulation techniques for axillary block using lidocaine with epinephrine

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Luiz Eduardo Imbelloni

2005-02-01

resulta en alta efectividad para el bloqueo axilar del plexo braquial. La técnica de utilizar múltiples estímulos exige más tiempo y mayor experiencia. Este estudio prospectivo compara la latencia y el índice de éxito del bloqueo del plexo braquial usando dos técnicas de localización: transarterial o múltipla estimulación de los nervios. MÉTODO: La lidocaína con epinefrina, 800 mg, fue usada inicialmente para el bloqueo axilar. En el grupo transarterial, 30 mL de lidocaína a 1,6% con epinefrina fueron inyectados profundamente y 20 mL superficialmente a la arteria axilar. En el grupo de múltipla estimulación, tres nervios fueron localizados eléctricamente y bloqueados con volúmenes 20 mL, 20 mL y 10 mL de la solución. El bloqueo fue considerado efectivo cuando la analgesia estaba presente en todos los nervios en la área distal al codo. RESULTADOS: El tiempo de latencia (8,8 ± 2,3 min versus 10,2 ± 2,4 min; p-valor = 0,010 fue significativamente menor en el grupo transarterial. Bloqueos sensitivos completos en los cuatro nervios (mediano, ulnar, radial y musculocutáneo fueron logrados en un 92,5% versus 83,3% en el grupo de múltipla estimulación y acceso transarterial, respectivamente sin diferencia significativa (p-valor = 0,68. El nervio musculocutáneo fue significativamente más fácil de bloquear con el estimulador de nervio periférico (p = 0,034. CONCLUSIONES: La técnica de múltipla estimulación para el bloqueo axilar usando estimulador de nervios (3 inyecciones y la técnica transarterial (2 inyecciones producen resultados semejantes en la calidad del bloqueo. El nervio musculocutáneo es más facilmente bloqueado con el uso del estimulador del nervio periférico. La técnica de múltipla estimulación necesitó menor suplementación del bloqueo y aumentó el tiempo para el inicio de la cirugía.BACKGROUND AND OBJECTIVES: High-dose transarterial technique results in highly effective axillary block. The multiple nerve stimulation technique

Estudio retrospectivo de la prevalencia de Fasciola hepática y análisis de pérdidas causadas por decomisos de hígados a nivel de centro de faenamiento

OpenAIRE

Buestán Sarmiento, Priscila Estefanía

2017-01-01

Este estudio determinó la prevalencia de Distomatosis hepática en bovinos y porcinos causada por el parásito trematodo Fasciola hepática, y estableció las pérdidas económicas ocasionadas por decomisos de hígados post faenamiento; mediante un análisis económico de pérdidas y un estudio retrospectivo de los años 2015 y 2016 a través de la información de los Registros Mensuales de Inspección Veterinaria que maneja el Centro de faenamiento. This study determined the prevalence of hepatic disto...

PUDRICIÓN BASAL CAUSADA POR Phytophthora capsici EN PLANTAS DE CHILE TRATADAS CON VERMICOMPOST

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Lidieth Uribe-Lor\\u00EDo

2014-01-01

Full Text Available Pudrición basal causada por Phytophthora capcisi en plantas de chile tratadas con vermicompost. El objetivo de este trabajo fue evaluar a nivel de invernadero el efecto de vermicompost sobre la incidencia y severidad de Phytophthora capcisi en plantas de chile (Capsicum annuum. Esta investigación se realizó entre febrero y marzo del 2012 en el Centro de Investigaciones Agronómicas, Sabanilla, San José, Costa Rica. Se utilizó un diseño completamente al azar con cuatro repeticiones y ocho plantas por unidad experimental en un arreglo factorial con los factores de dosis (0, 25% y 50% v/v vermicompost:suelo e inoculación (0 y 500 zoosporas por gramo de suelo. Se trasplantaron plántulas de 35 días, que fueron inoculadas dos semanas después del trasplante. La aplicación de vermicompost provocó un aumento significativo del peso fresco foliar y del peso seco foliar y radical; a mayor dosis, mayor fue el incremento. Las plantas de todos los tratamientos que incluyeron inoculación con P. capsici presentaron síntomas de la enfermedad en la raíz. Los valores de incidencia y severidad fueron mayores para el tratamiento con 50% de abono. En este tratamiento se presentaron síntomas de marchitez. La ausencia de diferencias en las variables de peso fresco y seco entre los tratamientos inoculados y sin inocular, a los que se adicionó abono al 25%, sugiere que esta dosis podría compensar el daño causado por el patógeno. Se observó una menor concentración de nutrimentos en los tejidos de las plantas inoculadas lo que indica que el daño causado a la raíz pudo haber afectado la adquisición de nutrimentos.

Solvent extraction of anionic chelate complexes of lanthanum(III), europium(III), lutetium(III), scandium(III), and indium(III) with 2-thenoyltrifluoroacetone as ion-pairs with tetrabutylammonium ions

International Nuclear Information System (INIS)

Noro, Junji; Sekine, Tatsuya.

1992-01-01

The solvent extraction of lanthanum(III), europium(III), lutetium(III), scandium(III), and indium(III) in 0.1 mol dm -3 sodium nitrate solutions with 2-thenoyltrifluoroacetone (Htta) in the absence and presence of tetrabutylammonium ions (tba + ) into carbon tetrachloride was measured. The extraction of lanthanum(III), europium(III), and lutetium(III) was greatly enhanced by the addition of tba + ; this could be explained in terms of the extraction of a ternary complex, M(tta) 4 - tba + . However, the extractions of scandium(III) and indium(III) were nearly the same when tba + was added. The data were treated on the basis of the formation equilibrium of the ternary complex from the neutral chelate, M(tta) 3 , with the extracted ion-pairs of the reagents, tta - tba + , in the organic phase. It was concluded that the degree of association of M(tta) 3 with the ion-pair, tta - tba + , is greater in the order La(tta) 3 ≅ Eu(tta) 3 > Lu(tta) 3 , or that the stability of the ternary complex in the organic phase is higher in the order La(tta) 4 - tba + ≅ Eu(tta) 4 - tba + > Lu(tta) 4 - tba + . This is similar to those of adduct metal chelates of Htta with tributylphosphate (TBP) in synergistic extraction systems. (author)

Efectividad de Cuatro Fungicidas en el Control de "La Quemazón de las Hojas" en Cebolla (Allium Cepa, Causada por Altemaria Porri

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Quintero Serpa Lumar

1960-06-01

Full Text Available En el presente trabajo, se considera la efectividad de cuatro fungicidas comerciales, bajo condiciones de campo, en el control de "la quemazón de las hojas" en cebolla, enfermedad causada por el Alternaria porri. Considerando como base para comprar la efectividad de los fungicidas el peso de los bulbos cosechados en cada tratamiento, se concluyó que el empleo de fungicidas aumentaba el rendimiento de las cosechas. El orden de efectividad de los cuatro fungicidas en el presente trabajo fue: Manzate, Parzate, Dithane Z-78 y Oxicob. Las conclusiones del presente trabajo deben considerarse como una contribución a este tema y solo a manera de trabajo preliminar; pero el hecho de haberse presentado diferencias considerables entre la producción de las parcelas tratadas y la testigo, sugiere la necesidad de experimentar más al respecto, con el fin de reforzar estos primeros resultados y averiguar sobre la efectividad de otros productos.

Sparkle/PM3 for the modeling of europium(III), gadolinium(III), and terbium(III) complexes

International Nuclear Information System (INIS)

Freire, Ricardo O.; Rocha, Gerd B.; Simas, Alfredo M.

2009-01-01

The Sparkle/PM3 model is extended to europium(III), gadolinium(III), and terbium(III) complexes. The validation procedure was carried out using only high quality crystallographic structures, for a total of ninety-six Eu(III) complexes, seventy Gd(III) complexes, and forty-two Tb(III) complexes. The Sparkle/PM3 unsigned mean error, for all interatomic distances between the trivalent lanthanide ion and the ligand atoms of the first sphere of coordination, is: 0.080 A for Eu(III); 0.063 A for Gd(III); and 0.070 A for Tb(III). These figures are similar to the Sparkle/AM1 ones of 0.082 A, 0.061 A, and 0.068 A respectively, indicating they are all comparable parameterizations. Moreover, their accuracy is similar to what can be obtained by present-day ab initio effective core potential full geometry optimization calculations on such lanthanide complexes. Finally, we report a preliminary attempt to show that Sparkle/PM3 geometry predictions are reliable. For one of the Eu(III) complexes, BAFZEO, we created hundreds of different input geometries by randomly varying the distances and angles of the ligands to the central Eu(III) ion, which were all subsequently fully optimized. A significant trend was unveiled, indicating that more accurate local minima geometries cluster at lower total energies, thus reinforcing the validity of sparkle model calculations. (author)

Uranium (III)-Plutonium (III) co-precipitation in molten chloride

Science.gov (United States)

Vigier, Jean-François; Laplace, Annabelle; Renard, Catherine; Miguirditchian, Manuel; Abraham, Francis

2018-02-01

Co-management of the actinides in an integrated closed fuel cycle by a pyrochemical process is studied at the laboratory scale in France in the CEA-ATALANTE facility. In this context the co-precipitation of U(III) and Pu(III) by wet argon sparging in LiCl-CaCl2 (30-70 mol%) molten salt at 705 °C is studied. Pu(III) is prepared in situ in the molten salt by carbochlorination of PuO2 and U(III) is then introduced as UCl3 after chlorine purge by argon to avoid any oxidation of uranium up to U(VI) by Cl2. The oxide conversion yield through wet argon sparging is quantitative. However, the preferential oxidation of U(III) in comparison to Pu(III) is responsible for a successive conversion of the two actinides, giving a mixture of UO2 and PuO2 oxides. Surprisingly, the conversion of sole Pu(III) in the same conditions leads to a mixture of PuO2 and PuOCl, characteristic of a partial oxidation of Pu(III) to Pu(IV). This is in contrast with coconversion of U(III)-Pu(III) mixtures but in agreement with the conversion of Ce(III).

Eficácia do moxalactam no tratamento de meningites purulentas causadas por Haemophilus infuenzae e Neisseria meningitidis Efficacy of moxalactam in the treatment of purulent meningitis caused by Haemophilus influenzae and Neisseria meningitidis

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Hagamenon R. da Silva

1984-03-01

Full Text Available Foi avaliada a eficácia do moxalactam no tratamento de meningites em crianças, causadas por H. influenzae (27 casos e N.meningitidis (6 casos. Dos 33 doentes tratados na dose de 100mg/Kg de peso (dose de ataque e 50mg de 12/12 horas por via venosa, 32 curaram-se. A tolerância ao produto foi muito boa, havendo alterações transitórias de transaminases e fosfatase alcalina; em um caso, houve hematoma posapendectomia, provavelmente relacionado ao uso deste antibiotico. Os níveis séricos e liquóricos do produto foram elevados; as concentrações no liquor excederam de muito a concentração bactericida mínima dos germes infectantes. O moxalactam se mostrou seguro e eficaz como terapia primária da meningite causada por H. influenzae e N.meningitidis em crianças.The clinical efficacy and safety of Moxalactam in purulent bacterial meningitis in children caused by H. influenzae (27 patients and N. meningitidis (6 patients was tested in a randon uncontrolled study. Clinical response was considered excelent, with cure of 32 of 33 patients. High levels of Moxalactam were achieved in the blood and cerebro-spinal fluid, with concentrations largely exceeding the minimum bacterial concentration (MIC for the infecting organisms. Tolerance was considered good, with only transient increases of transaminases and alkaline phosphatase in some patients; also, one patient developed a wound hematoma possibly related to Moxalactam therapy.

Síndrome del túnel del tarso: Normalización de una técnica diagnóstica electrofisiológica

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Juan Pablo Valderrama

1994-10-01

Full Text Available EI síndrome del túnel del tarso es una entidad frecuente en la población adulta, pero infrecuentemente documentada. En su diagnóstico los estudios de neuroconducción han demostrado ser importantes para confirmar su presencia y evaluar su severidad. La presente investigación, hace un análisis prospectivo de los hallazgos de neuroconducción motora de los nervios plantares interno y externo, encontrados en 32 individuos asintomáticos. Se verifica con el objeto de estandarizar valores de referencia para nuestro medio, aplicando la técnica de Felsenthal, para discriminar entre una lesión a nivel del túnel del tarso, lesiones aisladas de los nervios plantares o neuropatías distales por otra causa. Los resultados obtenidos mostraron una latencia motora promedio a través del túnel para el nervio plantar interno de 2.35 ms (rango O.64ms - 4.09ms y para el nervio plantar externo de 2.32ms (rango O.29ms - 3.77ms, también se establecieron velocidades de conducción proximal del nervio tibial para descartar anormalidades en su trayecto a través de la pierna, que pudieran invalidar los datos obtenidos distalmente.

Thermodecomposition of lanthanides (III) and ytrium (III) glucoheptonates

International Nuclear Information System (INIS)

Giolito, J.

1987-01-01

The lanthanides (III) and yttrium (III) glucoheptonates as well the D-glucoheptono 1-4 lactone were studied using common analytical methods, elemental microanalysis of carbon and hydrogen, thermogravimetry and differential scanning calorimetry. These compounds were prepared from the reaction between the lanthanides (III) and yttrium (III) hydroxides and glucoheptonic acid aqueous solution obtained by means of the delta lactone hydrolysis of this acid. After stoichiometric reaction the compounds were precipitated by the addition of absolute ethanol, washed with the same solvent and dried in desiccator. Thermogravimetric the (TG) curves of the lanthanides glucoheptonates of the ceric group present thermal profiles with enough differences permitting an easy caracterization of each compound and the yttrium (III) glucoheptonate TG curve showed a great similarity with the erbium (III) compound TG curve. The differential scanning calometry (DSC) curves showed endothermic and exothermic peaks by their shape, height and position (temperature) permit an easy and rapid identification of each compound specially if DSC and TG curves were examined simultaneously. (author) [pt

The Moessbauer effect in Fe(III) HEDTA, Fe(III) EDTA, and Fe(III) CDTA compounds

International Nuclear Information System (INIS)

Prado, F.R.

1989-01-01

The dependence of Moessbauer spectra with pH value of Fe(III)HEDTA and Fe(III)CDTA compounds is studied. Informations on formation processes of LFe-O-FeL (L=ligand) type dimers by the relation of titration curves of Fe(III)EDTA, Fe(III)HEDTA and Fe(III)CDTA compounds with the series of Moessbauer spectra, are obtained. Some informations on Fe-O-Fe bond structure are also obtained. Comparing the titration curves with the series of Moessbauer spectra, it is concluded that the dimerization process begins when a specie of the form FeXOH α (X = EDTA, HEDTA, CDTA; α = -1, -2) arises. (M.C.K.) [pt

Parálisis de Bell y dolor facial asociados con infección por Toxocara sp

OpenAIRE

Bachtiar, Arian; Auer, Herbert; Finsterer, Josef

2012-01-01

Objetivos: La toxocarosis que compromete los nervios craneales es extremadamente infrecuente y afecta casi exclusivamente al nervio óptico. No ha sido comunicada la toxocarosis que afecte al séptimo nervio cranial por lo que se expone un caso clínico. Caso clínico: Varón de 33 años que había presentado seis años antes, una otalgia izquierda seguida dos días más tarde de una parálisis de Bell ipsilateral. A pesar de un exhaustivo estudio, la causa de esta parálisis quedó sin etiología. En los ...

Sorption of trace amounts of gallium (III) on iron (III) oxide

International Nuclear Information System (INIS)

Music, S.; Gessner, M.; Wolf, R.H.H.

1979-01-01

The sorption of trace amounts of gallium(III) on iron(III) oxide has been studied as a function of pH. Optimum conditions have been found for the preconcentration of traces of gallium(III) by iron(III) oxide. The influence of surface active substances and of complexing agents on the sorption of trace amounts of gallium(III) on iron(III) oxide has been also studied. (orig.) [de

Sorption of trace amounts of gallium (III) on iron (III) oxide

Energy Technology Data Exchange (ETDEWEB)

Music, S; Gessner, M; Wolf, R H.H. [Institut Rudjer Boskovic, Zagreb (Yugoslavia)

1979-01-01

The sorption of trace amounts of gallium(III) on iron(III) oxide has been studied as a function of pH. Optimum conditions have been found for the preconcentration of traces of gallium(III) by iron(III) oxide. The influence of surface active substances and of complexing agents on the sorption of trace amounts of gallium(III) on iron(III) oxide has been also studied.

ANTRACNOSE DO CAQUIZEIRO CAUSADA POR Colletotrichum horii: INCIDÊNCIA EM RAMOS, FOLHAS, FLORES E FRUTOS EM CAMPO

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RENATO REZENDE YOUNG BLOOD

2015-06-01

Full Text Available O objetivo deste trabalho foi avaliar a incidência em várias partes da planta e o desenvolvimento da antracnose do caquizeiro causada por Colletotrichum horiinas cultivares Fuyu e Kakimel produzidas sob os sistemas orgânico e convencional, respectivamente, nas safras de 2010/2011 e 2011/2012, em Campina Grande do Sul, Paraná, Brasil. Em cada pomar, 10 plantas foram selecionadas aleatoriamente, e 10 ramos do ano por planta, distribuídos ao redor dacopa, foram marcados para as avaliações de incidência de antracnose em ramos e folhas, a cada 15 dias. A quantificação de frutos caídos com ou sem sintomas da doença foi a cada 15 dias, durante o período de crescimento de frutos até a colheita, relacionada com a produção total. C. horii em flores foi avaliada em campo e também após incubação no laboratório. Infecção latente foi observada em frutos verdes coletados aos 90; 120 e 150 dias após a floração. Em ambas as safras, observou-se a queda de frutos com sintomas de antracnose entre os meses de janeiro e abril. C. horii é capaz de infectar flores, permanecer latente e provocar sintomas de antracnose em frutos imaturos. Frutos colhidos sadios apresentaram sintomas em pós-colheita após a incubação.

WISC-III e WAIS-III na avaliação da inteligência de cegos WISC-III/WAIS-III en ciegos WISC-III and WAIS-III in intellectual assessment of blind people

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Elizabeth do Nascimento

2007-12-01

Full Text Available Diante da escassez de pesquisas nacionais e de testes psicológicos destinados a avaliar pessoas cegas, desenvolveu-se um estudo psicométrico com as escalas verbais dos testes WISC-III e WAIS-III. Após as adaptações de alguns estímulos e das instruções, os testes foram aplicados em crianças (N = 120 e adultos (N = 52 residentes em Belo Horizonte. Os resultados indicaram que as escalas verbais modificadas apresentam uma boa consistência interna (alfa> 0,80. Além disso, a investigação da validade fatorial identifica a presença clara de apenas um componente. Este componente explica 81% e 64% para o WISC-III e WAIS-III, respectivamente. Conclui-se que as adaptações a que se procedeu não afetaram a estrutura fatorial das escalas. Deste modo, os profissionais poderão utilizar as escalas modificadas para avaliar a inteligência de pessoas cegas.Frente a la escasez de investigaciones nacionales asi como la ausencia de tests psicológicos que evaluen personas ciegas, se ha desarrollado un estudio psicometrico com la escalas verbales del WISC-III y WAIS-III. Posteriormente a las adaptaciones de algunos estímulos y de las instrucciones, las escalas fueron aplicadas a una muestra de niños (n=120 y de adultos (n=52 residentes en la ciudad de Belo Horizonte-Brasil. Los resultados indican que las escalas verbales modificadas presentan una alta fiabilidad (alpha >0,80 asi como la presencia clara de un unico componente responsable por 81% y 64% de la variancia del WIC-III e WAIS-III respectivamente. Se ha concluido que las modificaciones efectuadas no han comprometido la estructura factorial de las escalas verbales. Por tanto, los profesionales psicólogos pueden utilizar las escalas modificadas para la evaluación de la inteligencia de personas portadoras de ceguera.Owing to the almost lack of a national research on psychological testing for the evaluation of blind people, a psychometric study has been developed with the WISC-III and WAIS-III

ALTERAÇÕES MICROMETEOROLÓGICAS CAUSADAS POR TÚNEIS BAIXOS DE TELA PLÁSTICA PRETA CULTIVADOS COM ALFACE

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Galileo Adeli Buriot

1994-01-01

Full Text Available RESUMO Foram determinadas alterações micrometeorológicas causadas por tela plástica preta com 18, 30 e 50% de atenuação da radiação solar incidente, durante os meses de verão, em Santa Maria, RS. O experimento foi conduzido no Campo Experimental do Departamento de Fitotecnia da UFSM, onde foram cultivados quatro canteiros com alface, três deles cobertos com túneis de tela plástica. O estudo foi realizado em 3 períodos: de 30/11/90 a 17/01/91, de 06/02/91 a 25/03/91 e de 10/12/91 a 01/03/92. Mediu-se a radiação solar global, radiação solar na faixa de comprimento de onda do infravermelho e a luminosidade, temperatura diurna do solo, temperatura mínima e diurna do ar e umidade do solo e do ar. Os resultados mostraram que a temperatura do solo e do ar e a perda de água do solo são menores sob os túneis do que no exterior. As diferenças cresceram com o aumento da atenuação e a temperatura mínima do ar e a umidade relativa do ar são semelhantes no interior e exterior dos túneis e entre os túneis com diferentes percentagens de atenuação.

"O corpo que eu fui e o corpo que eu sou": concepções de mulheres com alterações causadas pela hanseníase

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Iací Proença Palmeira

2012-01-01

Full Text Available Se objetivó comprender las concepciones de las mujeres sobre el cuerpo femenino con alteraciones provocadas por la lepra. Estudio de naturaleza cualitativa y descriptiva, que aplicó los conceptos de la teoría de las representaciones. Participaron cuarenta y tres mujeres con alteraciones corporales causadas por la lepra, frecuentadoras de una unidad de referencia especializada en dermatología sanitaria. Se realizó entrevista semi-estructurada, individual, y análisis temático de contenido. Los resultados muestran concepciones del cuerpo relacionadas a la salud (pasado y a la enfermedad (presente, mostrando la fuerza de la estética y la funcionalidad del cuerpo, influenciando en la participación e inserción social de estas mujeres. Se concluye que las concepciones de las mujeres sobre su cuerpo explican sus prácticas de cuidado de sí, y conocerlas contribuye para que enfermería mejore la atención de las necesidades de estas mujeres.

Extraction and separation studies of Ga(III, In(III and Tl(III using the neutral organophosphorous extractant, Cyanex-923

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P. M. DHADKE

2003-07-01

Full Text Available The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III, indium(III and thallium(III from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5–5.5, 5.0–6.5 and 1.5–3.0, respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III, In(III and Tl(III has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923] [where M = Ga(III or In(III ] and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III, In(III and Tl(III from each other was developed.

Potentiometric studies on some ternary complexes of Nd(III), Sm(III), Gd(III) and Ho(III) with cyclohexanediaminetetraacetic acid as primary ligand

International Nuclear Information System (INIS)

Marathe, D.G.; Munshi, K.N.

1983-01-01

The formation constants of the ternary complexes of neodymium(III), samarium(III), gadlonium(III) and holmium(III) with cyclohexanediaminetetraacetic acid (CyDTA) as primary ligand and dihydroxynaphthalene (DHN), dihydroxynaphthalene-6-sulphonic acid (DHNSA) and cateechol-3,5-disulphonic acid (CDSA) as secondary ligands have been investigated by potentiometric titration technique. The secondary ligands have been investigated by potentiometric titration technique. The values of formation constants of 1:1:1 ternary chelates are reported at three different temperatures, and at a fixed ionic strength, μ = 0.1 M (NaClO 4 ). (author)

Solvent effects on extraction of aluminum(III), gallium(III), and indium(III), with decanoic acid

International Nuclear Information System (INIS)

Yamada, Hiromichi; Hayashi, Hisao; Fujii, Yukio; Mizuta, Masateru

1986-01-01

Extraction of aluminum(III) and indium(III) with decanoic acid in 1-octanol was carried out at 25 deg C and at an aqueous ionic strength of 0.1 mol dm -3 (NaClO 4 ). Monomeric and tetrameric aluminum(III) decanoates and monomeric indium(III) decanoate are responsible for the extraction. From a comparison of the present results with those obtained from the previous works, the polymerization of the extracted species was found to be more extensive in benzene than in 1-octanol, and the metal decanoates were highly polymerized in the following order in both solvents: Al > Ga > In. (author)

Neuro-lepra: valor de la electromiografia

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Ernesto Herskovits

1971-09-01

Full Text Available Dada la frecuencia con que la lepra afecta al sistema nervioso, consideramos de interés realizar un estudio electromiográfico en zonas corporales clínicamente sanas. Hemos elegido para tal fin 14 enfermos que no tenían lesión sensitivo-motora clínicamente perceptible en el nervio cubital izquierdo. Hemos estudiado tambén un grupo de control de 5 enfermos con lesión evidente del mismo nervio. Se ha comprobado que de los 14 enfermos que aparentemente no tenían lesión del nervio cubital izquierdo, en 12 de ellos surgieron alteraciones electromiográficas que señalan la lesión del nervio, aunque en um grado menor que en el grupo de control. Este hecho nos hace pensar que la agresión que sufre el sistema nervioso periférico es de una extensión mayor que lo hace suponer la clínica, o que las lesiones anatómicas no retrogradan como nos lo sugiere el examen de los pacientes.

La tomografía de coherencia óptica en el diagnóstico de enfermedades de la retina y el nervio óptico Optic coherence tomography in the diagnosis of the retina and optic nerve diseases

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Carlos E Mendoza Santiesteban

2005-12-01

Full Text Available El autor principal hace una exposición sobre los principales métodos imagenológicos en la oftalmología y sus fundamentos, en especial de la tomografía óptica coherente con el equipo Stratus 3000. Con su colectivo de autores presenta una galería de imágenes de la tomografía óptica coherente acompañadas de imágenes de fondo de ojo y los campos visuales, de más de 500 pacientes con diversas enfermedades de retina y nervio óptico, lo que constituye el primer atlas cubano sobre esta entidadThe main author exposes the main imaging methods used in ophthalmology and their foundations, specially the optic coherence tomography with the Stratus 3000 equipment. Together with the other authors, he presents a gallery of images of the optic coherence tomography accompanied with images of the fundus oculi and the visual fields of more than 500 patients with different diseases of the retina and optic nerve, which constitute the first Cuban athlas on this entity

Synthesis and characterization of La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III) and Dy(III) complexes of 2-acetylfuran-2-thenoylhydrazone

International Nuclear Information System (INIS)

Singh, B.; Singh, Praveen K.

1998-01-01

The reaction of 2-acetylfuran-2-thenoylhydrazone(afth) with Ln(III) trichlorides yields complexes of the type [Ln(afth)Cl 2 (H 2 O)(EtOH)]Cl, [Ln(III) = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy]. The complexes have been characterized by molar conductance, magnetic susceptibility and TGA and DTA measurements, magnetic susceptibility and TGA and DTA measurements, FAB mass, infrared, proton NMR, electronic absorption and emission spectra. The terbium complex is found to be monomer from the FAB mass spectrum. The IR and NMR spectra suggest neutral tridentate behaviour of the Schiff base. A coordination number seven is proposed around the metal ions. Emission spectra suggest C 3v , symmetry around the metal ion with capped octahedron geometry for the europium complex. (author)

Preparation and characterisation of mixed ligand complexes of Co(III), Fe(III) and Cr(III) containing phthalimide and phenols

International Nuclear Information System (INIS)

Miah, M.A.J.; Islam, M.S.; Pal, S.C.; Barma, T.K.

1996-01-01

Some novel mixed ligand complexes of Co(III), Fe(III) and Cr(III) containing phthalimide as primary and 2-aminophenol and 3-aminophenol as secondary ligands have been synthesized and characterised on the basis of elemental analyses, conductivity and magnetic measurements and infrared and electronic spectral studies. Complexes containing 2-aminophenol are 1:1 electrolyte in N,N dimethylformamide. Spectral studies indicate that all the complexes exhibit octahedral geometry. The complexes have the general composition; K[M(pim)/sub 2/(L)/sub 2/]; where m=Co(III), Fe(III) and Cr(III), pim-anion of phthalimamide and L=anion of 2-aminophenol and 3-aminophenol. (author)

Thermodynamic data for predicting concentrations of Pu(III), Am(III), and Cm(III) in geologic environments

Energy Technology Data Exchange (ETDEWEB)

Rai, Dhanpat; Rao, Linfeng; Weger, H.T.; Felmy, A.R. [Pacific Northwest National Laboratory, WA (United States); Choppin, G.R. [Florida State University, Florida (United States); Yui, Mikazu [Japan Nuclear Cycle Development Inst., Tokai Works, Tokai, Ibaraki (Japan)

1999-01-01

This report provides thermodynamic data for predicting concentrations of Pu(III), Am(III), and Cm(III) in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system for high-level radioactive wastes. Thermodynamic data for the formation of complexes or compounds with hydroxide, chloride, fluoride, carbonate, nitrate, sulfate and phosphate are discussed in this report. Where data for specific actinide(III) species are lacking, the data were selected based on chemical analogy to other trivalent actinides. In this study, the Pitzer ion-interaction model is mainly used to extrapolate thermodynamic constants to zero ionic strength at 25degC. (author)

Luminescence study on solvation of americium(III), curium(III) and several lanthanide(III) ions in nonaqueous and binary mixed solvents

International Nuclear Information System (INIS)

Kimura, T.; Nagaishi, R.; Kato, Y.; Yoshida, Z.

2001-01-01

The luminescence lifetimes of An(III) and Ln(III) ions [An=Am and Cm; Ln=Nd, Sm, Eu, Tb and Dy] were measured in dimethyl sulfoxide(DMSO), N,N-dimethylformamide(DMF), methanol(MeOH), water and their perdeuterated solvents. Nonradiative decay rates of the ions were in the order of H 2 O > MeOH > DMF > DMSO, indicating that O-H vibration is more effective quencher than C-H, C=O, and S=O vibrations in the solvent molecules. Maximal lifetime ratios τ D /τ H were observed for Eu(III) in H 2 O, for Sm(III) in MeOH and DMF, and for Sm(III) and Dy(III) in DMSO. The solvent composition in the first coordination sphere of Cm(III) and Ln(III) in binary mixed solvents was also studied by measuring the luminescence lifetime. Cm(III) and Ln(III) were preferentially solvated by DMSO in DMSO-H 2 O, by DMF in DMF-H 2 O, and by H 2 O in MeOH-H 2 O over the whole range of the solvent composition. The order of the preferential solvation, i.e., DMSO > DMF > H 2 O > MeOH, correlates with the relative basicity of these solvents. The Gibbs free energy of transfer of ions from water to nonaqueous solvents was further estimated from the degree of the preferential solvation. (orig.)

Luminescence studies of Sm(III) and Cm(III) complexes in NaSCN/DHDECMP extraction systems

CERN Document Server

Chung, D Y; Kimura, T

1999-01-01

Laser-induced fluorescence (LIF) studies of Sm(III) and Cm(III) complexes in the NaSCN/DHDECMP solvent extraction system were carried out. Luminescence lifetimes were measured to determine the number of water molecules coordinated to Sm(III), Tb(III), Dy(III), and Cm(III) in the sodium thiocyanate solution and in the DHDECMP phase. The hydration number of Sm(III), Tb(III), Dy(III), and Cm(III) in the sodium thiocyanate solution decreased linearly with increasing sodium thiocyanate concentration. The hydration numbers of Sm(III), Dy(III), and Cm(III) in the DHDECMP phase decreased with increasing sodium thiocyanate concentration. The water molecules in the inner coordination sphere of Sm(III) and Dy(III) extracted into the DHDECMP were not completely removed at low sodium thiocyanate concentration but decreased with increasing sodium thiocyanate concentration. However, in the case of Cm(III) extracted into the DHDECMP phase from the sodium thiocyanate solution, there was no water in the inner coordination sphe...

Association of Eu(III) and Cm(III) with Bacillus subtilis and Halobacterium salinarum

International Nuclear Information System (INIS)

Ozaki, Takuo; Kimura, Takaumi; Ohnuki, Toshihiko; Yoshida, Zenko

2002-01-01

Adsorption behavior of Eu(III) and Cm(III) by Bacillus subtilis and Halobacterium salinarum was investigated. Both microorganisms showed almost identical pH dependence on the distribution ratio (K d ) of the metals examined, i.e., K d of Eu(III) and Cm(III) increased with an increase of pH. The coordination state of Eu(III) adsorbed on the microorganisms was studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS). The coordination states of Eu(III) adsorbed on the B. subtilis and H. salinarum was of different characteristics. H. salinarum exhibited more outer-spherical interaction with Eu(III) than B. subtilis. (author)

Sorption of small amounts of europium(III) on iron(III) hydroxide and oxide

International Nuclear Information System (INIS)

Music, S.; Gessner, M.; Wolf, R.H.H.

1979-01-01

The sorption of small amounts of europium(III) on iron(III) hydroxide and oxide has been studied as a function of pH. The mechanism of sorption is discussed. Optimum conditions have been found for the preconcentration of small or trace amounts of europium(III) by iron(III) hydroxide and oxide. The influence of complexing agents (EDTA, oxalate, tartrate and 5-sulfosalicylic acid) on the sorption of small amounts of europium(III) on iron(III) oxide has also been studied. (author)

Diseño y construcción de un electroestimulador para aplicarlo en terapias de rehabilitación del músculo esquelético atrofiado por inmovilización

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Bernardo Núñez Pérez

2010-01-01

Full Text Available En electroterapia, al aplicar un estímulo sobre un nervio motor es posible generar un potencial de acción que se transmita a lo largo del nervio y, en último lugar, excite el músculo que enerva dicho nervio. En este trabajo de investigación se diseñó y construyó un estimulador electrónico que envía pulsos eléctricos a músculos inervados, mediante un par de electrodos superficiales que se colocan sobre los puntos motores de los distintos grupos musculares. Los valores de frecuencia, intensidad de corriente y voltajes suministrados por el electroestimulador se encuentran dentro de los rangos especificados por la norma NTC 4121, la cual establece las magnitudes máximas permitidas para no causar traumas en el paciente.

Effects upon metabolic pathways and energy production by Sb(III and As(III/Sb(III-oxidase gene aioA in Agrobacterium tumefaciens GW4.

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Jingxin Li

Full Text Available Agrobacterium tumefaciens GW4 is a heterotrophic arsenite [As(III]/antimonite [Sb(III]-oxidizing strain. The As(III oxidase AioAB is responsible for As(III oxidation in the periplasm and it is also involved in Sb(III oxidation in Agrobacterium tumefaciens 5A. In addition, Sb(III oxidase AnoA and cellular H2O2 are also responsible for Sb(III oxidation in strain GW4. However, the deletion of aioA increased the Sb(III oxidation efficiency in strain GW4. In the present study, we found that the cell mobility to Sb(III, ATP and NADH contents and heat release were also increased by Sb(III and more significantly in the aioA mutant. Proteomics and transcriptional analyses showed that proteins/genes involved in Sb(III oxidation and resistance, stress responses, carbon metabolism, cell mobility, phosphonate and phosphinate metabolism, and amino acid and nucleotide metabolism were induced by Sb(III and were more significantly induced in the aioA mutant. The results suggested that Sb(III oxidation may produce energy. In addition, without periplasmic AioAB, more Sb(III would enter bacterial cells, however, the cytoplasmic AnoA and the oxidative stress response proteins were significantly up-regulated, which may contribute to the increased Sb(III oxidation efficiency. Moreover, the carbon metabolism was also activated to generate more energy against Sb(III stress. The generated energy may be used in Sb transportation, DNA repair, amino acid synthesis, and cell mobility, and may be released in the form of heat.

Mixed ligand complexes of some of the rare earths. La(III)-, Pr(III)- or Nd-(III)-CDTA-Hydroxy Acids

Energy Technology Data Exchange (ETDEWEB)

Rana, H S; Tandon, J P [Rajasthan Univ., Jaipur (India). Chemical Labs.

1975-11-01

Biligand complexes of the 1:1 Ln(III)-1,2-diaminocyclohexane-tetraacetic acid (CDTA) chelate with hydroxy acids (where hydroxy acids = salicylic acid (SA); Sulphosalicylic acid (SSA) and 8-hydroxyquinoline-5-sulphonic acid (HQSA)) have been investigated by potentiometric titration. Their formation constants have been calculated (..mu..=0.1M-KNO/sub 3/; and t=30+-1 deg C) as 4.60 +-0.03, 5.46+-0.03, 5.87+-0.05; 3.12+-0.04, 3.95+-0.05, 4.42+-0.07; 2.73+-0.06, 3.45+-0.05 and 3.90+-0.08 for Ln(III)-CDTA-SA,-SSA, and -HQSA respectively (where Ln=La, Pr or Nd). The value of log Ksub(MAB) follows the order: La(III)).

Lesão aguda esôfago - gástrica causada por agente químico Chemically induced esophagogastric acute injury

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P. R. Corsi

2000-06-01

Full Text Available O tratamento da ingestão de agentes químicos corrosivos continua controverso. A incidência desses episódios tem aumentado nas últimas décadas por várias razões. OBJETIVO: Analisar a ocorrência, as complicações e os resultados do tratamento da lesão esôfago - gástrica causada por agentes químicos. MÉTODOS: Foram estudados retrospectivamente 21 pacientes adultos com lesão esôfago-gástrica, causada por ingestão de substância química, admitidos até 23 dias após o episódio, no Serviço de Emergência da Santa Casa de Misericórdia de São Paulo num período de 12 anos. A média de idade foi 32,1 anos e 11 doentes pertenciam ao sexo feminino, as quais mais freqüentemente tinham intenções suicidas. A soda cáustica foi o produto mais ingerido (76,2%, ingestão de ácido muriático ocorreu em três casos (14,3%, amoníaco e ácido sulfúrico em um caso (4,8% cada. RESULTADOS: As lesões faríngeas e laríngeas estiveram freqüentemente associadas às lesões de esôfago, presentes em 18 casos (85,7%. As lesões esofágicas, gástricas e duodenais foram avaliadas e classificadas por endoscopia. Lesões graves esofágicas ou gástricas estiveram presentes em cinco casos cada. CONCLUSÃO: O tratamento e os resultados foram variados, mas sugeriram que a sondagem esofágica foi prejudicial. A mortalidade global foi 28,6%, mais elevada na lesão esofágica grau 3.Treatment of chemical agent ingestion remain controversial. The incidence of these episodes has increased over the several last decades due to a variety reasons. PURPOSE: To analise the occurance, complications and results of the treatment of chemically induced esophagogastric injury. METHODS: Twenty-one adult patients with chemically induced esophagogastric injury were retrospectively studied. The patients were admitted up to 23 days after ingestion of a chemical agent to the Emergency Department of Santa Casa of Sao Paulo University Hospital from August, in a 12-year

El estado de las lesiones causadas por el tránsito en México: evidencias para fortalecer la estrategia mexicana de seguridad vial

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Ricardo Pérez-Núñez

2014-05-01

Full Text Available Mediante la revisión de información secundaria oficial, publicaciones científicas y el análisis de la ENSANut-2012, este trabajo busca proveer una visión integral de la magnitud actual de las lesiones causadas por el tránsito (LCT en México y analizar críticamente la respuesta social organizada. Las altas tasas de choques, lesiones, muertes y discapacidad atribuidas a este problema de salud pública, representan un elevado costo para la sociedad mexicana, en especial para los hogares. Se discute cómo la respuesta mexicana se ha enfocado a los automovilistas, dejando fuera a usuarios vulnerables de la vía pública y se ha privilegiado la implementación de estrategias poco efectivas. A pesar de que se dispone de legislación para los principales factores de riesgo, se ha descuidado su correcta aplicación. La estrategia mexicana podría fortalecerse implementando estrategias de movilidad seguras, equitativas, saludables y sostenibles para los diferentes actores de la vía pública. A pesar de los avances que se han dado en términos de prevención de LCT, existen aún retos y oportunidades para el país.

Enhancement of the fluorescence of the samarium (III) complex by gadolinium (III)

International Nuclear Information System (INIS)

Yun-Xiang, C.; Zhang-Hua, L.

1988-01-01

The increase in sensitivity and selectivity of reactions in which colored species are formed by the addition of different metal ions is an area of research that has recently been developed. This phenomenon, which is sometimes called cocolaration effect, has been explained by the formation of mixed metal complex. The authors found an analogous phenomenon of reactions forming fluorescent complexes. The complexes of Sm(III)-thenoyltrifluoroacetone (TTA)-phenanthroline (Phen)-Triton-X-100 (TX-100) and Gd(III) (or La(III), Lu(III) and Y(III))-TTA-Phen-TX-100 had practically no fluorescence separately. Instead, a fluorescence-enhancement phenomenon caused by adding Gd or La, Lu and Y ions to the system was observed for the first time. The intensity of the enhanced fluorescence of Sm(III) complex was increased in the following order: La< Y< Lu< Gd. By analogy with cocoloration effect, the authors call this new fluorescence-enhancement phenomenon the co-fluorescence effect. The object of this work was to study the enhancement effect of Gd(III) on the fluorescence of the Sm(III)-TTA-Phen-TX-100 system. The recommended fluorimetric method has been applied to the determination of trace amounts of samarium in ytterbium oxide with satisfactory results. A general reaction mechanism for the system studied was proposed

Metallothionein (MT)-III

DEFF Research Database (Denmark)

Carrasco, J; Giralt, M; Molinero, A

1999-01-01

Metallothionein-III is a low molecular weight, heavy-metal binding protein expressed mainly in the central nervous system. First identified as a growth inhibitory factor (GIF) of rat cortical neurons in vitro, it has subsequently been shown to be a member of the metallothionein (MT) gene family...... injected rats. The specificity of the antibody was also demonstrated in immunocytochemical studies by the elimination of the immunostaining by preincubation of the antibody with brain (but not liver) extracts, and by the results obtained in MT-III null mice. The antibody was used to characterize...... the putative differences between the rat brain MT isoforms, namely MT-I+II and MT-III, in the freeze lesion model of brain damage, and for developing an ELISA for MT-III suitable for brain samples. In the normal rat brain, MT-III was mostly present primarily in astrocytes. However, lectin staining indicated...

Carcinoma adenoide quístico parotídeo: soluciones estéticas y funcionales

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Raquel Villar

2014-07-01

Full Text Available El carcinoma adenoide quístico supone el 10-30% de las neoplasias malignas parotídeas, su tratamiento se basa en una parotidectomía que incluya el tumor con un adecuado margen de seguridad y la radioterapia postoperatoria dado que permite mejorar el control locorregional de la enfermedad. Revisamos un caso que permite exponer el manejo de las secuelas funcionales y estéticas derivadas de su tratamiento. Consideramos adecuada la reconstrucción inmediata del nervio facial cuando se encuentra clínicamente afecto o englobado por el tumor; así como suplir el defecto de volumen posparotidectomía con un colgajo local. Proponemos la anastomosis nerviosa con injerto de nervio sural de las ramas del nervio facial afectas y el relleno del defecto volumen posparotidectomía con un colgajo de fascia temporo-parietal.

Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms

International Nuclear Information System (INIS)

Ozaki, T.; Kimura, T.; Ohnuki, T.; Yoshida, Z.; Gillow, J.B.; Francis, A.J.

2004-01-01

We investigated the association of europium(III) and curium(III) with the microorganisms Chlorella vulgaris, Bacillus subtilis, Pseudomonas fluorescens, Halomonas sp., Halobacterium salinarum, and Halobacterium halobium. We determined the kinetics and distribution coefficients (K d ) for Eu(III) and Cm(III) sorption at pH 3-5 by batch experiments, and evaluated the number of water molecules in the inner-sphere (N H 2 O ) and the degree of strength of ligand field (R E/M ) for Eu(III) by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Exudates from C. vulgaris, Halomonas sp., and H. halobium had an affinity for Eu(III) and Cm(III). The log K d of Eu(III) and Cm(III) showed that their sorption was not fully due to the exchange with three protons on the functional groups on cell surfaces. The halophilic microorganisms (Halomonas sp., Halobacterium salinarum, H. halobium) showed almost no pH dependence in log K d , indicating that an exchange with Na + on the functional groups was involved in their sorption. The ΔN H 2 O (= 9 - N H 2 O ) for Eu(III) on C. vulgaris was 1-3, while that for the other microorganisms was over 3, demonstrating that the coordination of Eu(III) with C. vulgaris was predominantly an outer-spherical process. The R E/M for Eu(III) on halophilic microorganisms was 2.5-5, while that for non-halophilic ones was 1-2.5. This finding suggests that the coordination environment of Eu(III) on the halophilic microorganisms is more complicated than that on the other three non-halophilic ones. (orig.)

Sorption behavior of europium(III) and curium(III) on the cell surfaces of microorganisms

Energy Technology Data Exchange (ETDEWEB)

Ozaki, T.; Kimura, T.; Ohnuki, T.; Yoshida, Z. [Advanced Science Research Center, Japan Atomic Energy Research Inst., Ibaraki (Japan); Gillow, J.B.; Francis, A.J. [Environmental Sciences Dept., Brookhaven National Lab., Upton, NY (United States)

2004-07-01

We investigated the association of europium(III) and curium(III) with the microorganisms Chlorella vulgaris, Bacillus subtilis, Pseudomonas fluorescens, Halomonas sp., Halobacterium salinarum, and Halobacterium halobium. We determined the kinetics and distribution coefficients (K{sub d}) for Eu(III) and Cm(III) sorption at pH 3-5 by batch experiments, and evaluated the number of water molecules in the inner-sphere (N{sub H{sub 2}O}) and the degree of strength of ligand field (R{sub E/M}) for Eu(III) by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Exudates from C. vulgaris, Halomonas sp., and H. halobium had an affinity for Eu(III) and Cm(III). The log K{sub d} of Eu(III) and Cm(III) showed that their sorption was not fully due to the exchange with three protons on the functional groups on cell surfaces. The halophilic microorganisms (Halomonas sp., Halobacterium salinarum, H. halobium) showed almost no pH dependence in log K{sub d}, indicating that an exchange with Na{sup +} on the functional groups was involved in their sorption. The {delta}N{sub H{sub 2}O} (= 9 - N{sub H{sub 2}O}) for Eu(III) on C. vulgaris was 1-3, while that for the other microorganisms was over 3, demonstrating that the coordination of Eu(III) with C. vulgaris was predominantly an outer-spherical process. The R{sub E/M} for Eu(III) on halophilic microorganisms was 2.5-5, while that for non-halophilic ones was 1-2.5. This finding suggests that the coordination environment of Eu(III) on the halophilic microorganisms is more complicated than that on the other three non-halophilic ones. (orig.)

El papel del músculo liso bronquial y los nervios en la fisiopatología del asma bronquial

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María Victoria Picó Bergantiños

2001-02-01

Full Text Available Gran cantidad de evidencia se ha recopilado en los últimos años con relación a la naturaleza inflamatoria del asma bronquial, lo que ha traído como consecuencia la revisión obligada de aspectos importantes de su fisiopatología, y entre estos aspectos consideramos de sumo interés el papel que juega el músculo liso bronquial y los nervios en la génesis y desarrollo de esta enfermedad. La proteína quinasa C (PKC está involucrada en la contracción mantenida del músculo liso bronquial in vitro, y puede por tanto ser de particular importancia en pacientes con asma crónica. El incremento del engrosamiento del músculo liso de las vías aéreas es otra característica llamativa en algunos pacientes con asma, y puede tener lugar tanto en las partes proximales como distales de las vías aéreas. La tos y la "apretazón" en el pecho son síntomas comunes en el asma y probablemente estos síntomas están mediados por la activación de aferentes nerviosos. Finalmente se expresan las posibles interrogantes futuras que pudieran definir las investigaciones en el campo de la fisiopatología del asma en lo relacionado con el músculo liso bronquial y la inervación pulmonarThe great deal of evidence that has been collected for the last years in connection with the inflammatory nature of bronchial asthma have led us to make an obliged review of some important aspects of its physiopathology. Among these aspects, we consider it is very interesting the role played by the airway smooth muscle and nerves in the genesis and development of this disease. The protein kinase C (PKC is involved in the maintained contraction of the airway smooth muscle in vitro and it may be of particular significance in patients with chronic asthma. The thickening of the airway smooth muscle is another characteristic of some patients with asthma and it may occur in the proximal parts and in the distal parts of the airways. Cough and chest "squeeze" are common symptoms in asthma

Lesões traumáticas de pele causadas pelos espinhos de Mimosa pudica e Mimosa debilis em equídeos

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Alessandra S. Belo Reis

2011-09-01

Full Text Available Foram realizadas pesquisas sobre a natureza e causa de lesões de pele em equídeos em uma propriedade no município de Castanhal, região Nordeste do Estado do Pará. Foram realizadas visitas técnicas, estudos epidemiológicos, coletas de sangue, biópsias de pele afetada e a inspeção da pastagem. O estudo incluiu 25 equídeos, dos quais 14 machos e 11 fêmeas, de seis meses e oito anos de idade. Os animais apresentaram lesões ulcerativas, de bordos irregulares, na cabeça (narinas, focinho, lábios superiores e inferiores e chanfro, na cavidade oral (vestíbulo bucal e gengiva e nos membros (boletos, metacarpos e metatarsos e articulação escápulo-umeral. No exame histopatológico foram observados focos de erosões cutâneas, caracterizados por perda e necrose da epiderme, com espongiose, degeneração vesicular da epiderme remanescente e leve infiltrado inflamatório na derme subjacente, constituído predominantemente por macrófagos e, em menor grau, eosinófilos. Na inspeção da pastagem, constituída de Brachiaria humidicola, foi constatada grande invasão de duas plantas providas de espinhos, Mimosa pudica e Mimosa debilis, ambas da família Leg. Mimosoideae. Concluiu-se, que as lesões de pele foram causadas pela ação traumática dos espinhos de Mimosa pudica e Mimosa debilis.

Transuranium perrhenates: Np(IV), Pu(IV) and (III), Am (III)

International Nuclear Information System (INIS)

Silvestre, Jean-Paul; Freundlich, William; Pages, Monique

1977-01-01

Synthesis in aqueous solution and by solid state reactions, crystallographical characterization and study of the stability of some transuranium perrhenates: Asup(n+)(ReO 4 - )sub(n) (A=Np(IV), Pu(IV), Pu(III), Am(III) [fr

Avaliação do trofismo muscular de sóleos de ratos wistar após compressão nervosa e tratamento com corrente de alta voltagem Evaluación del tropismo del músculo sóleo de ratas wistar después de la compresión del nervio y tratamiento con corriente de alto voltaje Assessment of wistar rats' soleus muscle trophism after nerve compression and treatment with high-voltage current

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Gladson Ricardo Flor Bertolini

2012-12-01

Full Text Available OBJETIVO: avaliar a corrente de alta voltagem sobre o trofismo de sóleos de ratos com compressão de nervo isquiático. Dezoito ratos distribuídos em: GS - compressão nervosa e simulacro; GP+ - compressão e tratado com corrente anódica; GP- - compressão e catódica. Ao final, os sóleos foram dissecados e pesados em balança analítica. Em seguida foram montadas lâminas de cortes transversais, observadas em microscópio óptico de luz comum e digitalizadas, para análise do menor diâmetro de 100 fibras por músculo. RESULTADOS: todos os grupos apresentaram menor trofismo pelas duas formas de avaliação (p0,05. CONCLUSÃO: a corrente de alta voltagem não inibiu a hipotrofia em sóleos submetidos à compressão nervosa.OBJETIVO: Evaluar la corriente de alto voltaje en el tropismo del sóleo de ratas con la compresión del nervio ciático. Dieciocho ratas se dividieron en: GS - compresión del nervio y la falsa; GP+ - compresión y tratados con corriente anódica; GP- - compresión y el cátodo. Por último, fueron los sóleos disecados y pesados ​​en una balanza analítica. Luego diapositivas de secciones transversales fueron montadas para la observación al microscopio de luz común y digitalizadas para el análisis de menor diámetro de 100 fibras por músculo. RESULTADOS: Todos los grupos mostraron menor tropismo, las dos formas de evaluación (p 0,05. CONCLUSIÓN: La corriente de alto voltaje no inhibe la atrofia en el músculo sóleo se sometieron a la compresión del nervio.AIM: to evaluate the high voltage current on the tropism of rats soleus with sciatic nerve compression. Eighteen rats were divided into: GS - nerve compression and sham; GP + - compression and treated with anodic current; GP - compression and cathode. Finally, the soleus were dissected and weighed on an analytical balance. Then slides were mounted cross sections observed in light microscope and digitized for analysis of smaller diameter of 100 fibers per

Estudio electrofisiológico de la funcion neuromuscular en una poblacion intoxicada con plomo

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O. M. Genovese

1988-03-01

Full Text Available Un grupo de 12 pacientes con cifras elevadas de plombemia y disminuidas de ALA D fueron estudiados electrofisiológicamente. Se efectuaron las siguientes determinaciones: amplitud de potencial evocado muscular; latencia distal motora; velocidad de conducción motora en los nervios mediano, ciático poplíteo externo y radial; velocidad de conducción sensitiva y amplitud del potencial evocado sensitivo de nervio en el mediano; exploración electromiográfica convencional; estudio de la transmisión neuromuscular, mediante estimulación repetitiva del nervio ciático popliteo externo a diversas frecuencias, con registro de la amplitud del potencial en músculo tibial anterior. Los datos obtenidos fueron comparados con controles. Se buscaron correlaciones entre las determinaciones bioquímicas y los diferentes hallazgos electrofisiológicos que a su vez se correlacionaron entre si y también con el tiempo de evolución de la intoxicación. Los hallazgos pusieron de manifiesto la presencia de neuropatía axonal junto a moderada desmielinización. La exploración de la transmisión neuromuscular mostró ocasional decremento o incremento de la amplitud del potencial muscular evocado, hechos que suponen cierta participación de la unión neuromuscular. Se halló correlación solamente entre disminución de ALA D y la disminución de las amplitudes del potencial sensitivo del mediano y el evocado muscular del mismo nervio y con la disminución de la VCM del nervio radial. Una débil relación se observó entre el tiempo de exposición y la disminución de la VCS del nervio mediano y VCM del radial. Las determinaciones bioquímicas y el tiempo de exposición transcurridos no probaron ser parámetros sensibles para determinar el grado de afectación del sistema nervioso periférico. El conjunto do hallazgos sugiere que el desarrollo de la neuropatía puede estar ligado a factores individuales de predisposición al daño nervioso.

Basel III D: Swiss Finish to Basel III

OpenAIRE

Christian M. McNamara; Natalia Tente; Andrew Metrick

2014-01-01

After the Basel Committee on Banking Supervision (BCBS) introduced the Basel III framework in 2010, individual countries confronted the question of how best to implement the framework given their unique circumstances. Switzerland, with a banking industry that is both heavily concentrated and very large relative to the size of its overall economy, faced a special challenge. It ultimately adopted what is sometimes referred to as the “Swiss Finish” to Basel III – enhanced requirements applicable...

Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

International Nuclear Information System (INIS)

Papassiopi, N.; Vaxevanidou, K.; Christou, C.; Karagianni, E.; Antipas, G.S.E.

2014-01-01

Highlights: • Fe(III)–Cr(III) hydroxides enhance groundwater quality better than pure Cr(III) compounds. • Crystalline Cr(OH) 3 ·3H 2 O was unstable, with a solubility higher than 50 μg/l. • Amorphous Cr(OH) 3 (am) was stable with a solubility lower than 50 μg/l in the range 5.7 0.75 Cr 0.25 (OH) 3 , the stability region was extended to 4.8 3 ·xH 2 O whereas in the presence of iron the precipitate is a mixed Fe (1−x) Cr x (OH) 3 phase. In this study, we report on the synthesis, characterisation and stability of mixed (Fe x ,Cr 1−x )(OH) 3 hydroxides as compared to the stability of Cr(OH) 3 . We established that the plain Cr(III) hydroxide, abiding to the approximate molecular formula Cr(OH) 3 ·3H 2 O, was crystalline, highly soluble, i.e. unstable, with a tendency to transform into the stable amorphous hydroxide Cr(OH) 3 (am) phase. Mixed Fe 0.75 Cr 0.25 (OH) 3 hydroxides were found to be of the ferrihydrite structure, Fe(OH) 3 , and we correlated their solubility to that of a solid solution formed by plain ferrihydrite and the amorphous Cr(III) hydroxide. Both our experimental results and thermodynamic calculations indicated that mixed Fe(III)–Cr(III) hydroxides are more effective enhancers of groundwater quality, in comparison to the plain amorphous or crystalline Cr(III) hydroxides, the latter found to have a solubility typically higher than 50 μg/l (maximum EU permitted Cr level in drinking water), while the amorphous Cr(OH) 3 (am) phase was within the drinking water threshold in the range 5.7 0.75 Cr 0.25 (OH) 3 hydroxides studied were of extended stability in the 4.8 < pH < 13.5 range

Binary and ternary chelates of Sc(III), Y(III) and La(III) with ethylenediamine tetraacetic acid as primary ligand and substituted salicylic acids as secondary ligands

Energy Technology Data Exchange (ETDEWEB)

Pandey, A K; Chandra, M; Agarwala, B V; Dey, A K [Allahabad Univ. (India). Chemical Labs.

1980-02-01

Study of ternary complex formation of several tripositive metal ions viz. Sc(III), Y(III) and La(III) with ethylenediamine tetraacetic acid (EDTA) as a primary ligand and 5-chlorosalicylic acid (CSA) or 3,5-dibromosalicylic acid (DBSA) as secondary ligands by pH-metric titration technique is reported. The stability order of metal chelates with respect to ligands is observed to be DBSA>CSA and with respect to metal ions Sc(III)>Y(III)>La(III).

Semiconducting III-V compounds

CERN Document Server

Hilsum, C; Henisch, Heinz R

1961-01-01

Semiconducting III-V Compounds deals with the properties of III-V compounds as a family of semiconducting crystals and relates these compounds to the monatomic semiconductors silicon and germanium. Emphasis is placed on physical processes that are peculiar to III-V compounds, particularly those that combine boron, aluminum, gallium, and indium with phosphorus, arsenic, and antimony (for example, indium antimonide, indium arsenide, gallium antimonide, and gallium arsenide).Comprised of eight chapters, this book begins with an assessment of the crystal structure and binding of III-V compounds, f

Development of a C3-symmetric benzohydroxamate tripod: Trimetallic complexation with Fe(III), Cr(III) and Al(III)

Science.gov (United States)

Baral, Minati; Gupta, Amit; Kanungo, B. K.

2016-06-01

The design, synthesis and physicochemical characterization of a C3-symmetry Benzene-1,3,5-tricarbonylhydroxamate tripod, noted here as BTHA, are described. The chelator was built from a benzene as an anchor, symmetrically extended by three hydroxamate as ligating moieties, each bearing O, O donor sites. A combination of absorption spectrophotometry, potentiometry and theoretical investigations are used to explore the complexation behavior of the ligand with some trivalent metal ions: Fe(III), Cr(III), and Al(III). Three protonation constants were calculated for the ligand in a pH range of 2-11 in a highly aqueous medium (9:1 H2O: DMSO). A high rigidity in the molecular structure restricts the formation of 1:1 (M/L) metal encapsulation but shows a high binding efficiency for a 3:1 metal ligand stoichiometry giving formation constant (in β unit) 28.73, 26.13 and 19.69 for [M3L]; Mdbnd Fe(III), Al(III) and Cr(III) respectively, and may be considered as an efficient Fe-carrier. The spectrophotometric study reveals of interesting electronic transitions occurred during the complexation. BTHA exhibits a peak at 238 nm in acidic pH and with the increase of pH, a new peak appeared at 270 nm. A substantial shifting in both of the peaks in presence of the metal ions implicates a s coordination between ligand and metal ions. Moreover, complexation of BTHA with iron shows three distinct colors, violet, reddish orange and yellow in different pH, enables the ligand to be considered for the use as colorimetric sensor.

Feocromocitoma asociado a neurofibromatosis de von Recklinghausen Pheochromocytoma associated with von Recklinghausen neurofibromatosis

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Ramón N. Herrera

2007-10-01

Full Text Available El feocromocitoma es un tumor glandular adrenal secretor de hormonas epinefrina y norepinefrina, responsables de regular la frecuencia cardíaca y la presión arterial, entre otras funciones. Este tumor puede ocurrir solo o en combinación con otros desórdenes; los factores genéticos y ambientales juegan un rol clave en su aparición. La neurofibromatosis tipo 1 (NF-1 es un desorden genético frecuente que se hereda en forma autosómica dominante, caracterizado por la formación de neurofibromas (tumores que involucran los nervios tisulares en piel, tejido subcutáneo, nervios craneales y espinales. La NF-1 se diagnostica generalmente con el examen físico. No existe un tratamiento curativo para la NF-1, pero hay modos de tratar algunas de sus complicaciones. La hipertensión arterial en la neurofibromatosis causada por un feocromocitoma es extremadamente rara con una incidencia de menos del 1% en menores de 10 años y en adultos jóvenes. Presentamos el caso clínico de una mujer joven con hipertensión de reciente diagnóstico, con la infrecuente asociación de neurofibromatosis y feocromocitoma. Discutimos los mecanismos fisiopatológicos subyacentes y sus implicancias clínicas.A pheochromo cytoma is an adrenal gland tumor that secretes epinephrine and norepinephrine hormones, and is responsible for regulating heart rate and blood pressure, among other functions. The condition can occur alone or in combination with other disorders, and genetic and environmental factors play a key role. Neurofibromatosis- 1 (NF-1 an inherited "autosomal dominant" disorder is one of the most common genetic disorders, characterized by formation of neurofibromas (tumors involving nerve tissue in the skin, subcutaneous tissue, cranial and spinal root nerves. NF1 generally is diagnosed by physical examination. There is no cure for NF1, but there are ways to treat some of its effects. Neurofibromatosis arterial hypertension caused by pheochromocytoma is extremely

A comparative study of ion exchange properties of antimony (III) tungstoselenite with those of antimony (III) tungstate and antimony (III) selenite

International Nuclear Information System (INIS)

Janardanan, C.; Nair, S.M.K.

1996-01-01

A new inorganic ion exchanger, antimony (III) tungstoselenite, has been prepared and characterised. Its exchange capacity and distribution coefficients for various metal ions and the effects of temperature and electrolyte concentrations on ion exchange capacity have been compared with antimony (III) tungstate and antimony (III) selenite. Six binary separations using the exchanger have been carried out. (author). 7 refs., 1 tab

Fluorimetric determination of samarium(III) and europium(III) in neodymium oxide by separation with a resin column

Energy Technology Data Exchange (ETDEWEB)

Shaorong Liu; Jian Meng (Beijing Research Institute of Chemical Engineering and Metallurgy (China)); Wenhua Liu (General Research Institute for Non-Ferrous Metals (China))

1992-08-24

When thenoyltrifluoroacetone-phenanthroline-Triton X-100 is used to determine samarium(III) and europium(III) fluorimetrically, only a limited amount of neodymium(III) can be tolerated. By using an on- line separation which can partially separate neodymium(III) from samarium(III), a practical and convenient method was developed to detect samarium(III) at concentrations >0.05% and europium(III) at concentrations >0.005% in neodymium oxide. (author). 7 refs.; 4 figs.; 3 tabs.

Fluorimetric determination of samarium(III) and europium(III) in neodymium oxide by separation with a resin column

International Nuclear Information System (INIS)

Shaorong Liu; Jian Meng; Wenhua Liu

1992-01-01

When thenoyltrifluoroacetone-phenanthroline-Triton X-100 is used to determine samarium(III) and europium(III) fluorimetrically, only a limited amount of neodymium(III) can be tolerated. By using an on- line separation which can partially separate neodymium(III) from samarium(III), a practical and convenient method was developed to detect samarium(III) at concentrations >0.05% and europium(III) at concentrations >0.005% in neodymium oxide. (author). 7 refs.; 4 figs.; 3 tabs

Interaction of Eu(III) and Cm(III) with mucin. A key component of the human mucosa

International Nuclear Information System (INIS)

Wilke, Claudia; Barkleit, Astrid

2017-01-01

To evaluate the potential health risks caused by the ingestion of lanthanides (Ln) and actinides (An), investigations into the chemical behavior of these metals in the human gastrointestinal tract are necessary. Mucin is an important part of the protective mucosa layer in the digestive system. We have recently reported that mucin interacts strongly with Eu(III) and Cm(III), representatives of Ln(III) and An(III), respectively, under in vivo conditions. In order to investigate the complexation behavior of this protein with Ln(III)/An(III), TRLFS measurements were performed on Eu(III)/Cm(III)-mucin solutions with different protein concentrations and at different pH. The results indicate the formation of at least two independent mucin species. At higher pH, the formation of hydroxide species was also observed.

Interaction of Eu(III) and Cm(III) with mucin. A key component of the human mucosa

Energy Technology Data Exchange (ETDEWEB)

Wilke, Claudia; Barkleit, Astrid [Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden (Germany). Chemistry of the F-Elements

2017-06-01

To evaluate the potential health risks caused by the ingestion of lanthanides (Ln) and actinides (An), investigations into the chemical behavior of these metals in the human gastrointestinal tract are necessary. Mucin is an important part of the protective mucosa layer in the digestive system. We have recently reported that mucin interacts strongly with Eu(III) and Cm(III), representatives of Ln(III) and An(III), respectively, under in vivo conditions. In order to investigate the complexation behavior of this protein with Ln(III)/An(III), TRLFS measurements were performed on Eu(III)/Cm(III)-mucin solutions with different protein concentrations and at different pH. The results indicate the formation of at least two independent mucin species. At higher pH, the formation of hydroxide species was also observed.

Separation of valence forms of chromium(III) and chromium(VI) by coprecipitation with iron(III) hydroxide

International Nuclear Information System (INIS)

Nazirmadov, B.; Khamidov, B.O.; Egorova, L.A.

1989-01-01

The sorption of 9.62·10 -5 M of Cr (III) and Cr (VI) with iron hydroxide in 1 M potassium nitrate and potassium chloride was investigated in relation to the pH of the medium. Experimental data on the sorption of chromium(III) and chromium(VI) with iron(III) hydroxide made it possible to determine the region of practically complete concentration of Cr (III) and Cr (VI) (pH = 3-6.5). The results from spectrophotometric investigations, calculated data on the distribution of the hydroxocationic forms of chromium(III) and the anions of chromium(IV), and their sorption by iron-(III) hydroxide made it possible to characterize the sorbability of the cationic and anionic forms of chromium in various degrees of oxidation. On this basis a method was developed for the separation of chromium(III) and chromium(VI) by coprecipitation on iron(III) hydroxide and their separation from the iron(III) hydroxide support

Syntheses, structures, and magnetic properties of a family of heterometallic heptanuclear [Cu5Ln2] (Ln = Y(III), Lu(III), Dy(III), Ho(III), Er(III), and Yb(III)) complexes: observation of SMM behavior for the Dy(III) and Ho(III) analogues.

Science.gov (United States)

Chandrasekhar, Vadapalli; Dey, Atanu; Das, Sourav; Rouzières, Mathieu; Clérac, Rodolphe

2013-03-04

Sequential reaction of the multisite coordination ligand (LH3) with Cu(OAc)2·H2O, followed by the addition of a rare-earth(III) nitrate salt in the presence of triethylamine, afforded a series of heterometallic heptanuclear complexes containing a [Cu5Ln2] core {Ln = Y(1), Lu(2), Dy(3), Ho(4), Er(5), and Yb(6)}. Single-crystal X-ray crystallography reveals that all the complexes are dicationic species that crystallize with two nitrate anions to compensate the charge. The heptanuclear aggregates in 1-6 are centrosymmetrical complexes, with a hexagonal-like arrangement of six peripheral metal ions (two rare-earth and four copper) around a central Cu(II) situated on a crystallographic inversion center. An all-oxygen environment is found to be present around the rare-earth metal ions, which adopt a distorted square-antiprismatic geometry. Three different Cu(II) sites are present in the heptanuclear complexes: two possess a distorted octahedral coordination sphere while the remaining one displays a distorted square-pyramidal geometry. Detailed static and dynamic magnetic properties of all the complexes have been studied and revealed the single-molecule magnet behavior of the Dy(III) and Ho(III) derivatives.

Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

Energy Technology Data Exchange (ETDEWEB)

Papassiopi, N.; Vaxevanidou, K.; Christou, C.; Karagianni, E.; Antipas, G.S.E., E-mail: gantipas@metal.ntua.gr

2014-01-15

Highlights: • Fe(III)–Cr(III) hydroxides enhance groundwater quality better than pure Cr(III) compounds. • Crystalline Cr(OH){sub 3}·3H{sub 2}O was unstable, with a solubility higher than 50 μg/l. • Amorphous Cr(OH){sub 3}(am) was stable with a solubility lower than 50 μg/l in the range 5.7 < pH < 11. • For mixed Fe{sub 0.75}Cr{sub 0.25}(OH){sub 3}, the stability region was extended to 4.8 < pH < 13.5. -- Abstract: Chromium is a common contaminant of soils and aquifers and constitutes a major environmental problem. In nature, chromium usually exists in the form of two oxidation states, trivalent, Cr(III), which is relatively innocuous for biota and for the aquatic environment, and hexavalent, Cr(VI) which is toxic, carcinogenic and very soluble. Accordingly, the majority of wastewater and groundwater treatment technologies, include a stage where Cr(VI) is reduced to Cr(III), in order to remove chromium from the aqueous phase and bind the element in the form of environmentally stable solid compounds. In the absence of iron the final product is typically of the form Cr(OH){sub 3}·xH{sub 2}O whereas in the presence of iron the precipitate is a mixed Fe{sub (1−x)}Cr{sub x}(OH){sub 3} phase. In this study, we report on the synthesis, characterisation and stability of mixed (Fe{sub x},Cr{sub 1−x})(OH){sub 3} hydroxides as compared to the stability of Cr(OH){sub 3}. We established that the plain Cr(III) hydroxide, abiding to the approximate molecular formula Cr(OH){sub 3}·3H{sub 2}O, was crystalline, highly soluble, i.e. unstable, with a tendency to transform into the stable amorphous hydroxide Cr(OH){sub 3}(am) phase. Mixed Fe{sub 0.75}Cr{sub 0.25}(OH){sub 3} hydroxides were found to be of the ferrihydrite structure, Fe(OH){sub 3}, and we correlated their solubility to that of a solid solution formed by plain ferrihydrite and the amorphous Cr(III) hydroxide. Both our experimental results and thermodynamic calculations indicated that mixed Fe(III)–Cr(III

Structural Characterization of Am(III)- and Pu(III)-DOTA Complexes.

Science.gov (United States)

Audras, Matthieu; Berthon, Laurence; Berthon, Claude; Guillaumont, Dominique; Dumas, Thomas; Illy, Marie-Claire; Martin, Nicolas; Zilbermann, Israel; Moiseev, Yulia; Ben-Eliyahu, Yeshayahu; Bettelheim, Armand; Cammelli, Sebastiano; Hennig, Christoph; Moisy, Philippe

2017-10-16

The complexation of 1,4,7,10-tetrazacyclodecane-1,4,7,10-tetraacetic acid (DOTA) ligand with two trivalent actinides (Am 3+ and Pu 3+ ) was investigated by UV-visible spectrophotometry, NMR spectroscopy, and extended X-ray absorption fine structure in conjunction with computational methods. The complexation process of these two cations is similar to what has been previously observed with lanthanides(III) of similar ionic radius. The complexation takes place in different steps and ends with the formation of a (1:1) complex [(An(III)DOTA)(H 2 O)] - , where the cation is bonded to the nitrogen atoms of the ring, the four carboxylate arms, and a water molecule to complete the coordination sphere. The formation of An(III)-DOTA complexes is faster than the Ln(III)-DOTA systems of equivalent ionic radius. Furthermore, it is found that An-N distances are slightly shorter than Ln-N distances. Theoretical calculations showed that the slightly higher affinity of DOTA toward Am over Nd is correlated with slightly enhanced ligand-to-metal charge donation arising from oxygen and nitrogen atoms.

Manejo Odontológico del Síndrome de Moebius

Directory of Open Access Journals (Sweden)

Rosa M. Stabile-Del Vecchio

2016-07-01

Full Text Available El síndrome de Möebius es una alteración congénita caracterizada por parálisis de los pares craneales debido a una atrofia de sus núcleos, principalmente se ven afectados el nervio facial y el nervio abducens causando parálisis facial y limitación del movimiento ocular. Otros nervios craneales también se ven afectados lo que trae anomalías dentales y esqueletales. Puede a su vez, estar asociado a malformaciones de las extremidades superiores e inferiores como sindactilia y pie equinovaro. Su etiología es aún desconocida, pero se relaciona a un problema vascular que afecta el desarrollo de los núcleos de los pares craneales. El objetivo de esta investigación es describir las característi as del Síndrome de Möebius y reportar 3 casos clínicos que acudieron a consulta odontológica.

Synthesis, structure, luminescent, and magnetic properties of carbonato-bridged Zn(II)2Ln(III)2 complexes [(μ4-CO3)2{Zn(II)L(n)Ln(III)(NO3)}2] (Ln(III) = Gd(III), Tb(III), Dy(III); L(1) = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L(2) = N,N'-bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato).

Science.gov (United States)

Ehama, Kiyomi; Ohmichi, Yusuke; Sakamoto, Soichiro; Fujinami, Takeshi; Matsumoto, Naohide; Mochida, Naotaka; Ishida, Takayuki; Sunatsuki, Yukinari; Tsuchimoto, Masanobu; Re, Nazzareno

2013-11-04

Carbonato-bridged Zn(II)2Ln(III)2 complexes [(μ4-CO3)2{Zn(II)L(n)Ln(III)(NO3)}2]·solvent were synthesized through atmospheric CO2 fixation reaction of [Zn(II)L(n)(H2O)2]·xH2O, Ln(III)(NO3)3·6H2O, and triethylamine, where Ln(III) = Gd(III), Tb(III), Dy(III); L(1) = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato, L(2) = N,N'-bis(3-ethoxy-2-oxybenzylidene)-1,3-propanediaminato. Each Zn(II)2Ln(III)2 structure possessing an inversion center can be described as two di-μ-phenoxo-bridged {Zn(II)L(n)Ln(III)(NO3)} binuclear units bridged by two carbonato CO3(2-) ions. The Zn(II) ion has square pyramidal coordination geometry with N2O2 donor atoms of L(n) and one oxygen atom of a bridging carbonato ion at the axial site. Ln(III) ion is coordinated by nine oxygen atoms consisting of four from the deprotonated Schiff-base L(n), two from a chelating nitrate, and three from two carbonate groups. The temperature-dependent magnetic susceptibilities in the range 1.9-300 K, field-dependent magnetization from 0 to 5 T at 1.9 K, and alternating current magnetic susceptibilities under the direct current bias fields of 0 and 1000 Oe were measured. The magnetic properties of the Zn(II)2Ln(III)2 complexes are analyzed on the basis of the dicarbonato-bridged binuclear Ln(III)-Ln(III) structure, as the Zn(II) ion with d(10) electronic configuration is diamagnetic. ZnGd1 (L(1)) and ZnGd2 (L(2)) show a ferromagnetic Gd(III)-Gd(III) interaction with J(Gd-Gd) = +0.042 and +0.028 cm(-1), respectively, on the basis of the Hamiltonian H = -2J(Gd-Gd)ŜGd1·ŜGd2. The magnetic data of the Zn(II)2Ln(III)2 complexes (Ln(III) = Tb(III), Dy(III)) were analyzed by a spin Hamiltonian including the crystal field effect on the Ln(III) ions and the Ln(III)-Ln(III) magnetic interaction. The Stark splitting of the ground state was so evaluated, and the energy pattern indicates a strong easy axis (Ising type) anisotropy. Luminescence spectra of Zn(II)2Tb(III)2 complexes were observed, while those

WISC-III e WAIS-III na avaliação da inteligência de cegos WISC-III/WAIS-III en ciegos WISC-III and WAIS-III in intellectual assessment of blind people

OpenAIRE

Elizabeth do Nascimento; Carmen Elvira Flores-Mendoza

2007-01-01

Diante da escassez de pesquisas nacionais e de testes psicológicos destinados a avaliar pessoas cegas, desenvolveu-se um estudo psicométrico com as escalas verbais dos testes WISC-III e WAIS-III. Após as adaptações de alguns estímulos e das instruções, os testes foram aplicados em crianças (N = 120) e adultos (N = 52) residentes em Belo Horizonte. Os resultados indicaram que as escalas verbais modificadas apresentam uma boa consistência interna (alfa> 0,80). Além disso, a investigação da vali...

Richard III

DEFF Research Database (Denmark)

Lauridsen, Palle Schantz

2017-01-01

Kort analyse af Shakespeares Richard III med fokus på, hvordan denne skurk fremstilles, så tilskuere (og læsere) langt henad vejen kan føle sympati med ham. Med paralleller til Netflix-serien "House of Cards"......Kort analyse af Shakespeares Richard III med fokus på, hvordan denne skurk fremstilles, så tilskuere (og læsere) langt henad vejen kan føle sympati med ham. Med paralleller til Netflix-serien "House of Cards"...

NMR and TRLFS studies of Ln(iii) and An(iii) C5-BPP complexes.

Science.gov (United States)

Adam, Christian; Beele, Björn B; Geist, Andreas; Müllich, Udo; Kaden, Peter; Panak, Petra J

2015-02-01

C5-BPP is a highly efficient N-donor ligand for the separation of trivalent actinides, An(iii), from trivalent lanthanides, Ln(iii). The molecular origin of the selectivity of C5-BPP and many other N-donor ligands of the BTP-type is still not entirely understood. We present here the first NMR studies on C5-BPP Ln(iii) and An(iii) complexes. C5-BPP is synthesized with 10% 15 N labeling and characterized by NMR and LIFDI-MS methods. 15 N NMR spectroscopy gives a detailed insight into the bonding of C5-BPP with lanthanides and Am(iii) as a representative for trivalent actinide cations, revealing significant differences in 15 N chemical shift for coordinating nitrogen atoms compared to Ln(iii) complexes. The temperature dependence of NMR chemical shifts observed for the Am(iii) complex indicates a weak paramagnetism. This as well as the observed large chemical shift for coordinating nitrogen atoms show that metal-ligand bonding in Am(C5-BPP) 3 has a larger share of covalence than in lanthanide complexes, confirming earlier studies. The Am(C5-BPP) 3 NMR sample is furthermore spiked with Cm(iii) and characterized by time-resolved laser fluorescence spectroscopy (TRLFS), yielding important information on the speciation of trace amounts of minor complex species.

Separation by liquid-liquid extraction of actinides(III) from lanthanides(III) using new molecules: the picolinamides; Separation par extraction liquide-liquide des actinides(III) des lanthanides(III) par de nouvelles molecules: les picolinamides

Energy Technology Data Exchange (ETDEWEB)

Cordier, P Y [CEA Marcoule, Departement de Recherche en Retraitement et en Vitrification, 30 - Bagnols-sur-Ceze (France); [Clermont-Ferrand-2 Univ., 63 - Aubiere (France)

1996-07-01

In the field of long-lived radionuclides separation from waste generated during spent fuel reprocessing, the picolinamides have been chosen as potential extractants for the selective extraction of actinides (III) from lanthanides (III). The first studies initiated on the most simple molecule of the picolinamide family, namely 2-pyridinecarboxamide, pointed out that in an aqueous media the complexation stability constant between this ligand and Am(III) is roughly 10 times higher than the ones corresponding to Ln(III). The synthesis of lipophilic derivatives of 2-pyridinecarboxamide leaded to extraction experiments. The extraction of metallic cation by lipophilic picolinamides, according to a solvatation mechanism, is strongly dependent on the nature of the amide function: a primary amide function (group I) leads to a good extraction; on the contrary, there is a decrease for secondary (group II) and tertiary (group III) amide functions. From a theoretical point of view, this work leads finally to the following conclusions: confirmation of the importance of the presence of soft donor atoms within the extractants (nitrogen in our case) for An(III)/Ln(III). Also, sensitivity of this soft donor atom regarding the protonation reaction; prevalence in our case of the affinity of the extractant for the metallic cation over the lipophilia of the extractant to ensure good distribution coefficients. The extraction and Am(III)/Ln(III) separation performances of the picolinamides from pertechnetic media leads to the design of a possible flowsheet for the reprocessing of high level liquid waste, with the new idea of an integrated technetium reflux. (author) 105 refs.

Extraction behaviour of Am(III) and Eu(III) from nitric acid medium in TEHDGA-HDEHP impregnated resins

Energy Technology Data Exchange (ETDEWEB)

Saipriya, G.; Kumar, T. [Bhabha Atomic Research Centre Facilities, Kalpakkam (India). Kalpakkam Reprocessing Plant; Kumaresan, R.; Nayak, P.K.; Venkatesan, K.A.; Antony, M.P. [Indira Gandhi Center for Atomic Research, Kalpakkam (India). Fuel Chemistry Div.

2016-07-01

The extraction behaviour of Am(III) and Eu(III) from nitric acid medium was studied in the solvent impregnated resins containing extractants such as tetra-bis(2-ethylhexyl)diglycolamide (TEHDGA) or bis-(2-ethylhexyl)phosphoric acid (HDEHP) or mixture of TEHDGA+HDEHP. The rate of extraction of Am(III) and Eu(III) from 1 M nitric acid and the effect of various parameters, such as the concentration of nitric acid in aqueous phase and concentration of TEHDGA and HDEHP in resin phase, on the distribution coefficient of Am(III) and Eu(III) was studied. The distribution coefficient of Am(III) and Eu(III) in HDEHP-impregnated resin decreased and that in TEHDGA-impregnated resin increased, with increase in the concentration of nitric acid. However, in (TEHDGA+HDEHP) - impregnated resin, synergic extraction was observed at lower nitric acid concentration and antagonism at higher nitric acid concentration. The mechanism of Am(III) and Eu(III) extraction in the combined resin was investigated by slope analysis method. The extraction of various metal ions present in the fast reactor simulated high-level liquid waste was studied. The separation factor of Am(III) over Eu(III) was studied using citrate-buffered diethylenetriaminepentaacetic acid (DTPA) solution.

Characterization of the lanthanum(III) and europium(III) trichloroacetate complexes extracted with 18-crown-6

International Nuclear Information System (INIS)

Imura, H.; Saito, Y.; Ohashi, K.; Meguro, Y.; Yoshida, Z.; Choppin, G.R.

1996-01-01

Extraction of lanthanide(III) ions with 18-crown-6 (18C6) and trichloroacetate (tca) has been studied. The composition, hydration, and structure of the La(III) and Eu(III) complexes extracted into 1,2-dichloroethane were investigated by using several methods such as the liquid-liquid distribution technique, conductimetry, Karl Fisher titration, laser luminescence spectroscopy, and 1 H NMR. The La(III) complex was found to be a monohydrate, La(tca) 3 (18C6)(H 2 O), while that of Eu(III) was a mixture of a monohydrate and a dihydrate, i.e., Eu(tca) 3 (18C6)(H 2 O) and Eu(tca) 3 (18C6)(H 2 O) 2 . The origin of the selectivity by 18C6 which gives much higher extractability of La(III) than of Eu(III) is explained by considering the hydration and probable structure of their complexes. 12 refs., 5 figs., 4 tabs

Purification of chicken carbonic anhydrase isozyme-III (CA-III) and its measurement in White Leghorn chickens.

Science.gov (United States)

Nishita, Toshiho; Tomita, Yuichiro; Yorifuji, Daisuke; Orito, Kensuke; Ochiai, Hideharu; Arishima, Kazuyosi

2011-11-26

The developmental profile of chicken carbonic anhydrase-III (CA-III) blood levels has not been previously determined or reported. We isolated CA-III from chicken muscle and investigated age-related changes in the levels of CA-III in blood. CA-III was purified from chicken muscle. The levels of CA-III in plasma and erythrocytes from 278 female chickens (aged 1-93 weeks) and 68 male chickens (aged 3-59 weeks) were determined by ELISA. The mean level of CA-III in female chicken erythrocytes (1 week old) was 4.6 μg/g of Hb, and the CA-III level did not change until 16 weeks of age. The level then increased until 63 weeks of age (11.8 μg/g of Hb), decreased to 4.7 μg/g of Hb at 73 weeks of age, and increased again until 93 weeks of age (8.6 μg/g of Hb). The mean level of CA-III in erythrocytes from male chickens (3 weeks old) was 2.4 μg/g of Hb, and this level remained steady until 59 weeks of age. The mean plasma level of CA-III in 1-week-old female chickens was 60 ng/mL, and this level was increased at 3 weeks of age (141 ng/mL) and then remained steady until 80 weeks of age (122 ng/mL). The mean plasma level of CA-III in 3-week-old male chickens was 58 ng/mL, and this level remained steady until 59 weeks of age. We observed both developmental changes and sex differences in CA-III concentrations in White Leghorn (WL) chicken erythrocytes and plasma. Simple linear regression analysis showed a significant association between the erythrocyte CA-III level and egg-laying rate in WL-chickens 16-63 weeks of age (p < 0.01).

Extraction and stripping of neodymium (III) and dysprosium (III) by TRUEX solvent

International Nuclear Information System (INIS)

Rout, Alok; Venkatesan, K.A.; Antony, M.P.; Srinivasan, T.G.; Vasudeva Rao, P.R.

2009-01-01

McCabe-Thiele diagram for the extraction and stripping of Nd (III) and Dy (III) by TRUEX solvent has been constructed to determine the number of stages required for complete extraction and stripping. (author)

Identificación precoz de complicaciones microvasculares en la obesidad infantil. Relación interdisciplinaria y confección de nuevos protocolos basados en el análisis de mediadores celulares y moleculares y en el estudio del fondo del ojo.

OpenAIRE

Pacheco Cervera, Jana

2016-01-01

El objetivo es valorar estructural y funcionalmente la retina y el nervio óptico del niño obeso mediante un triple abordaje: determinar los calibres arteriovenosos retinianos, analizar las imágenes de la retina y del nervio óptico e identificar los marcadores bioquímicos emergentes relacionados con la inflamación, el estrés oxidativo y el daño vascular. Los objetivos secundarios son; averiguar si la obesidad infantil produce cambios estructurales en los vasos retinianos, como se sabe que ocur...

Insight into the Extraction Mechanism of Americium(III) over Europium(III) with Pyridylpyrazole: A Relativistic Quantum Chemistry Study.

Science.gov (United States)

Kong, Xiang-He; Wu, Qun-Yan; Wang, Cong-Zhi; Lan, Jian-Hui; Chai, Zhi-Fang; Nie, Chang-Ming; Shi, Wei-Qun

2018-05-10

Separation of trivalent actinides (An(III)) and lanthanides (Ln(III)) is one of the most important steps in spent nuclear fuel reprocessing. However, it is very difficult and challenging to separate them due to their similar chemical properties. Recently the pyridylpyrazole ligand (PypzH) has been identified to show good separation ability toward Am(III) over Eu(III). In this work, to explore the Am(III)/Eu(III) separation mechanism of PypzH at the molecular level, the geometrical structures, bonding nature, and thermodynamic behaviors of the Am(III) and Eu(III) complexes with PypzH ligands modified by alkyl chains (Cn-PypzH, n = 2, 4, 8) have been systematically investigated using scalar relativistic density functional theory (DFT). According to the NBO (natural bonding orbital) and QTAIM (quantum theory of atoms in molecules) analyses, the M-N bonds exhibit a certain degree of covalent character, and more covalency appears in Am-N bonds compared to Eu-N bonds. Thermodynamic analyses suggest that the 1:1 extraction reaction, [M(NO 3 )(H 2 O) 6 ] 2+ + PypzH + 2NO 3 - → M(PypzH)(NO 3 ) 3 (H 2 O) + 5H 2 O, is the most suitable for Am(III)/Eu(III) separation. Furthermore, the extraction ability and the Am(III)/Eu(III) selectivity of the ligand PypzH is indeed enhanced by adding alkyl-substituted chains in agreement with experimental observations. Besides this, the nitrogen atom of pyrazole ring plays a more significant role in the extraction reactions related to Am(III)/Eu(III) separation compared to that of pyridine ring. This work could identify the mechanism of the Am(III)/Eu(III) selectivity of the ligand PypzH and provide valuable theoretical information for achieving an efficient Am(III)/Eu(III) separation process for spent nuclear fuel reprocessing.

Hydration structure of Ti(III) and Cr(III): Monte Carlo simulation ...

African Journals Online (AJOL)

Classical Monte Carlo simulations were performed to investigate the solvation structures of Ti(III) and Cr(III) ions in water with only ion-water pair interaction potential and by including three-body correction terms. The hydration structures were evaluated in terms of radial distribution functions, coordination numbers and ...

Extraction Separation of Am(III) and Eu(III) with Thermo-sensitive Gel introducing TPEN Derivatives

International Nuclear Information System (INIS)

Kenji Takeshita; Yoshio Nakano; Tatsuro Matsumura; Atsunori Mori

2008-01-01

A thermal-swing chromatographic process using a thermo-sensitive gel co-polymerized with NIPA (N-isopropyl-acrylamide) and TPPEN (N,N,N',N'-tetrakis(4-propenyl-oxy-2-pyridyl-methyl)ethylenediamine) was studied for the separation of Am(III) from Eu(III). First, the radiolysis of the TPPEN-NIPA gel was tested by the γ-ray irradiation and the α nuclide adsorption. The extraction separation of Am(III) was not influenced in the radioactive environment of the proposed process. Next, the TPPEN-NIPA gel was immobilized in porous silica particles and the applicability of the gel-immobilized silica to the proposed process was tested. Am(III) was extracted selectively in the gel-immobilized silica at 5 deg. C and the separation factor of Am(III) over Eu(III) was evaluated to be 3.7. The distribution ratio of Am(III) was reduced to less than 1/20 by increasing temperature from 5 deg. C to 40 deg. C. These results indicate that the TPPEN-NIPA gel is applicable to the thermal-swing chromatographic process for the minor actinide recovery. (authors)

PERFORATION OF INFERIOR ALVEOLAR NERVE BY MAXILLARY ARTERY. Perforation of inferior alveolar nerve by maxillary artery

Directory of Open Access Journals (Sweden)

Prakash B Billakanti

2016-03-01

Full Text Available La fosa infratemporal es un área anatómica clínicamente importante para la administración de agentes anestésicos locales en odontología y cirugía maxilofacial. Fueron estudiadas variaciones en la anatomía del nervio alveolar inferior y la arteria maxilar en la disección infratemporal. Durante la disección rutinaria de la cabeza en el cadáver de un varón adulto, fue observada una variación excepcional en el origen del nervio alveolar inferior y su relación con las estructuras circundantes. El nervio alveolar inferior se originaba en el nervio mandibular por dos raíces y la primera parte de la arteria maxilar estaba incorporada entre ambas. El origen embriológico de esta variación y sus implicaciones clínicas es debatido. Dado que la arteria maxilar transcurría entre las dos raíces del nervio alveolar inferior, y el nervio estaba fijado entre el foramen oval y el foramen mandibular, el atrapamiento vásculo-nervioso pudo causar entume-cimiento o dolor de cabeza e interferir con la inyección de anestésicos locales en la fosa infratemporal.  Variaciones anatómicas en esta región deben ser tenidas en cuenta, especialmente en casos de tratamiento fallido de neuralgia del trigémino. Infratemporal fossa is clinically important anatomical area for the delivery of local anesthetic agents in dentistry and maxillofacial surgery. Variations in the anatomy of the inferior alveolar nerve and maxillary artery were studied in infratemporal dissection. During routine dissection of the head in an adult male cadaver an unusual variation in the origin of the inferior alveolar nerve and its relationship with the surrounding structures was observed. The inferior alveolar nerve originated from the mandibular nerve by two roots and the first part of the maxillary artery was incorporated between them. An embryologic origin of this variation and its clinical implications is discussed. Because the maxillary artery runs between the two roots of

Efecto del ácido acetil salicílico y Bacillus subtilis en la infección causada por Cucumber mosaic virus en calabacita

Directory of Open Access Journals (Sweden)

E. Maldonado-Cruz

2008-01-01

Full Text Available Dos conocidos agentes inductores de resistencia en las plantas, ácido acetil salicílico y Bacillus subtilis, fueron evaluados con la finalidad de conocer su efecto en la infección causada por el Cucumber mosaic virus (CMV en Cucurbita pepo var. Zucchini grey.Se estableció un diseño experimental completamente al azar en invernadero con cinco tratamientos y ocho repeticiones: Bacillus subtilis aplicado al suelo, B. subtilis aplicado al follaje; B. subtilis aplicado al suelo y al follaje, ácido acetil salicílico aplicado al follaje y testigo (sin aplicación de ninguno de los productos antes indicados. Plantas de 20 días de edad fueron inoculadas mecánicamente con Cucumber mosaic virus y 15 días después de la inoculación se evaluaron las variables peso de biomasa fresca y concentración viral mediante la técnica de DAS-ELISA. Los resultados muestran que las plantas inoculadas con B. subtilis al suelo y ácido acetil salicílico tuvieron significativamente mayor peso de biomasa fresca comparados con el tratamiento Testigo (P¿0.05. Las plantas de todos los tratamientos donde se aplicó B. subtilis (al suelo, al follaje o al suelo y al follaje tuvieron una concentración viral significativamente menor comparadas con el testigo (P¿0.05 en la prueba de ELISA.

Variation in plasmonic (electronic) spectral parameters of Pr (III) and Nd (III) with varied concentration of moderators

Energy Technology Data Exchange (ETDEWEB)

Mishra, Shubha, E-mail: shubhamishra03@gmail.com [School of Studies in Physics, Vikram University, Ujjain (M. P.) (India); Limaye, S. N., E-mail: snl222@yahoo.co.in [Department of Chemistry, Dr. H.S. Gour University, A Central University, Sagar (M.P.) (India)

2015-07-31

It is said that the -4f shells behave as core and are least perturbed by changes around metal ion surrounding. However, there are evidences that-4f shells partially involved in direct moderator interaction. A systematic investigation on the plasmonic (electronic) spectral studies of some Rare Earths[RE(III).Mod] where, RE(III) = Pr(III),Nd(III) and Mod(moderator) = Y(III),La(III),Gd(III) and Lu(III), increased moderator concentration from 0.01 mol dm{sup −3} to 0.025 mol dm{sup −3} keeping the metal ion concentration at 0.01mol dm{sup −3} have been carried out. Variations in oscillator strengths (f), Judd-Ofelt parameters (T{sub λ}),inter-electronic repulsion Racah parameters (δE{sup k}),nephelauxetic ratio (β), radiative parameters (S{sub ED},A{sub T},β{sub R},T{sub R}). The values of oscillator strengths and Judd-Ofelt parameters have been discussed in the light of coordination number of RE(III) metal ions, denticity and basicity of the moderators. The [RE(III).Mod] bonding pattern has been studies in the light of the change in Racah parameters and nephelauxetic ratio.

Purification of chicken carbonic anhydrase isozyme-III (CA-III and its measurement in White Leghorn chickens

Directory of Open Access Journals (Sweden)

Nishita Toshiho

2011-11-01

Full Text Available Abstract Background The developmental profile of chicken carbonic anhydrase-III (CA-III blood levels has not been previously determined or reported. We isolated CA-III from chicken muscle and investigated age-related changes in the levels of CA-III in blood. Methods CA-III was purified from chicken muscle. The levels of CA-III in plasma and erythrocytes from 278 female chickens (aged 1-93 weeks and 68 male chickens (aged 3-59 weeks were determined by ELISA. Results The mean level of CA-III in female chicken erythrocytes (1 week old was 4.6 μg/g of Hb, and the CA-III level did not change until 16 weeks of age. The level then increased until 63 weeks of age (11.8 μg/g of Hb, decreased to 4.7 μg/g of Hb at 73 weeks of age, and increased again until 93 weeks of age (8.6 μg/g of Hb. The mean level of CA-III in erythrocytes from male chickens (3 weeks old was 2.4 μg/g of Hb, and this level remained steady until 59 weeks of age. The mean plasma level of CA-III in 1-week-old female chickens was 60 ng/mL, and this level was increased at 3 weeks of age (141 ng/mL and then remained steady until 80 weeks of age (122 ng/mL. The mean plasma level of CA-III in 3-week-old male chickens was 58 ng/mL, and this level remained steady until 59 weeks of age. Conclusion We observed both developmental changes and sex differences in CA-III concentrations in White Leghorn (WL chicken erythrocytes and plasma. Simple linear regression analysis showed a significant association between the erythrocyte CA-III level and egg-laying rate in WL-chickens 16-63 weeks of age (p

Analgesia pós-operatória com bloqueio bilateral do nervo pudendo com bupivacaína S75:R25 a 0,25%: estudo piloto em hemorroidectomia sob regime ambulatorial Analgesia pos-operatoria con bloqueo bilateral del nervio pudendo con bupivacaína S75:R25 a 0,25%: estudio piloto en hemorroidectomia bajo régimen ambulatorial Bilateral pudendal nerves block for postoperative analgesia with 0.25% S75:R25 bupivacaine: pilot study on outpatient hemorrhoidectomy

Directory of Open Access Journals (Sweden)

Luiz Eduardo Imbelloni

2005-12-01

permitirão demonstrar se esta técnica deve ser a primeira opção para analgesia em hemorroidectomias. A permanência de anestesia perineal por 20,21 horas deverá induzir novos trabalhos com o bloqueio dos nervos pudendos orientado por estimulador para o ato cirúrgico.JUSTIFICATIVA Y OBJETIVOS: La hemorroidectomia puede ser realizada bajo varias técnicas anestésicas y en régimen ambulatorial. El dolor pos-operatorio es intenso y puede atrasar el retorno para el hogar. El objetivo de este estudio fue evaluar las ventajas y la realización del bloqueo bilateral de los nervios pudendos para analgesia pos-operatoria en hemorroidectomias. MÉTODO: El bloqueo bilateral de los nervios pudendos con bupivacaína S75:R25 a 0,25% fue realizado con estimulador de nervios en 35 pacientes sometidos a la hemorroidectomia bajo raquianestesia. Fueron evaluadas intensidad del dolor, duración de la analgesia, analgesia de demanda y eventuales complicaciones relacionadas a la técnica. Los datos fueron evaluados a las 6, 12, 18, 24 y 30 horas después del término de la intervención quirúrgica. RESULTADOS: En todos los pacientes, fue logrado éxito con la estimulación de ambos los nervios pudendos. En ningún momento de la evaluación ocurrió dolor intenso. Hasta 12 horas después del bloqueo, todos los pacientes presentaron anestesia en la región perineal; con 18 horas, 17 pacientes y 24 horas, 10 pacientes A analgesia pos-operatoria fue óptima en 18 pacientes; satisfactoria, en cinco pacientes; e insatisfactoria, en siete pacientes. La duración media de la analgesia fue de 23,77 horas. No ocurrieron alteraciones de la presión arterial, de la frecuencia cardiaca, ni fueron observados náuseas o vómitos. Todos los pacientes tuvieron micción espontánea. Ninguna complicación local o sistémica fue relacionada al anestésico local. Veintisiete pacientes clasificaron de excelente la técnica de analgesia y apenas tres pacientes del sexo masculino quedaron satisfechos

Evolución de la recuperación de la sensibilidad posterior a osteotomía sagital de rama mandibular bilateral

OpenAIRE

Erita Cordero; Roberto Pantoja; Cristóbal Pacheco; Sebastián Correa; Rolando Carrasco; Luis Carreño

2017-01-01

Introducción: La osteotomía sagital de rama mandibular bilateral es uno de los procedimientos quirúrgicos más comunes durante la cirugía ortognática. Con relación a ello se han descrito múltiples reportes que indican cambios a nivel neurosensitivo en el nervio alveolar inferior. Los rangos posquirúrgicos de parestesia han sido descritos entre un 12,5 y el 100%. El objetivo de este trabajo fue determinar el porcentaje de recuperación sensitiva del territorio inervado por el nervio alveolar inf...

Recent operational history of the new Sandia Pulsed Reactor III (SPR III)

International Nuclear Information System (INIS)

Schmidt, T.R.; Estes, B.F.; Reuscher, J.A.

1977-01-01

The Sandia Pulsed Reactor III (SPR III) is a fast-pulse research reactor which was designed and built at Sandia Laboratories and achieved criticality in August 1975. The reactor is now characterized and is in an operational configuration. The core consists of 18 fuel plates (258 kg fuel mass) of fully enriched uranium alloyed with 10 wt.% molybdenum. It is arranged in an annular configuration with an inside diameter of 17.78 cm, an outside diameter of 29.72 cm, and a height of 35.9 cm. The reactor core uses reflectors of copper and aluminum for control and an external bolting arrangement to secure the fuel plates. SPR III and SPR II are operated on an interchangeable basis using the same facility and control system. As of June 1977, SPR III has had over 240 operations with core temperatures up to 541 0 C

Characterization of ribonuclease III from Brucella.

Science.gov (United States)

Wu, Chang-Xian; Xu, Xian-Jin; Zheng, Ke; Liu, Fang; Yang, Xu-Dong; Chen, Chuang-Fu; Chen, Huan-Chun; Liu, Zheng-Fei

2016-04-01

Bacterial ribonuclease III (RNase III) is a highly conserved endonuclease, which plays pivotal roles in RNA maturation and decay pathways by cleaving double-stranded structure of RNAs. Here we cloned rncS gene from the genomic DNA of Brucella melitensis, and analyzed the cleavage properties of RNase III from Brucella. We identified Brucella-encoding small RNA (sRNA) by high-throughput sequencing and northern blot, and found that sRNA of Brucella and Homo miRNA precursor (pre-miRNA) can be bound and cleaved by B.melitensis ribonuclease III (Bm-RNase III). Cleavage activity of Bm-RNase III is bivalent metal cations- and alkaline buffer-dependent. We constructed several point mutations in Bm-RNase III, whose cleavage activity indicated that the 133th Glutamic acid residue was required for catalytic activity. Western blot revealed that Bm-RNase III was differently expressed in Brucella virulence strain 027 and vaccine strain M5-90. Collectively, our data suggest that Brucella RNase III can efficiently bind and cleave stem-loop structure of small RNA, and might participate in regulation of virulence in Brucella. Copyright © 2016 Elsevier B.V. All rights reserved.

Antithrombin III blood test

Science.gov (United States)

... medlineplus.gov/ency/article/003661.htm Antithrombin III blood test To use the sharing features on this page, ... a protein that helps control blood clotting. A blood test can determine the amount of AT III present ...

Fatores de risco associados à mastite bovina causada por Prototheca zopfii Risk factors associated with bovine mastitis caused by Prototheca zopfii

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Aline Artioli Machado Yamamura

2008-06-01

Full Text Available Este trabalho teve como objetivo o estudo de fatores de risco associados à mastite bovina causada por Prototheca zopfii. Foram analisadas 13 propriedades leiteiras dos Estados do Paraná e de São Paulo, segundo os seguintes critérios de seleção: confirmação prévia de casos de mastite por Prototheca spp., triagem pela pesquisa de Prototheca spp. em tanques de expansão e latões e rebanhos com contagem de células somáticas acima de 5x105cel mL-1. As amostras coletadas consistiram de: leite, água, solo, fezes e swab de teteiras. Prototheca spp. foi isolada de amostras de leite dos quartos mamários com mastite clínica ou subclínica em uma propriedade e de amostras de leite e do ambiente em quatro propriedades, nas quais foi isolada em amostras de: água de bebedouro, abastecimento, esgoto, empoçada no piso de estábulo e sala de ordenha, solo de piquete e pasto, teteiras, fezes de bezerros e suínos. Do total de 383 vacas examinadas, Prototheca spp. foi isolada em 20 (5,2% vacas, sendo caracterizada como P. zopfii em 18. Os fatores de risco associados à mastite causada por P. zopfii foram: criação das vacas a pasto, alimentação dos animais com pasto e silagem, realização de ordenha mecânica em estábulo, permanência das vacas após ordenha em piquete sem alimento, criação de suínos próxima às instalações dos bovinos, existência de cães, gatos e roedores, falta de higienização dos tetos com água, pré-imersão dos tetos em aplicador com retorno e sem a troca do anti-séptico, alimentação dos bezerros com leite de vacas com mastite clínica e serem as vacas da raça holandesa.This research had as objective the study of risk factors associated with bovine mastitis caused by Prototheca zopfii. Thirteen dairy herds in Paraná and São Paulo states were analyzed and selected according to the following criteria: previous confirmation of Prototheca spp. mastitis cases, screening of Prototheca spp. in bulk tanks and

Investigation of the separation of americium(III) and europium(III) by high-speed countercurrent chromatography

International Nuclear Information System (INIS)

Wu, J.F.; Jin, Y.R.; Xu, Q.C.; Wang, S.L.; Zhang, L.X.

2005-01-01

The long-lived actinides are the important elements in the radioactive waste ;disposal. Because the ions semi diameter and chemical properties of trivalent actinides(III) and trivalent lanthanides(III) are very similar, the separation between them is very difficult. Yang Yu-Sheng put forward the actinides(III) are softer acid than the lanthanides(III), so the actinides(III) are more easily extracted by the soft extractant contain sulfur or nitrogen than the lanthanides(III). Some research have been done on the separation between actinides(III) and lanthanides(III) using the extractants contain sulfur or nitrogen. The results show that satisfactory separation efficiency was gained. Countercurrent Chromatography (CCC) have many specific advantages, such as free from solid support, permit large sample volume and high flow rate, which is useful in the preconcentration of inorganic solute and inorganic preparation. Some studies were done on the separation of lanthanides or-other inorganic elements by HSCCC, the high-purity reagents prepared by HSCCC or CPC turned out to be successful. In present paper, the investigation of separation between Americium (III) and Euricium (III) by High-Speed Countercurrent Chromatography (HSCCC) were made. The extractant used in the work was prepared by ourselves, which is of the soft extractant contrain sulfur. The effects of separation condition on the separation efficiency of Am and Eu by HSCCC were investigated using dichlorophenyl dithiophosphinic acid in xylene as the stationary phase and 0.1 mol/L NaClO4 as mobile phase, respectively. The results show that mutual separation between Am and Eu can be accomplished. The separation factor increases with the increasing of the concentration of extractant and the pH value of the mobile phase, further more, minishing the flow rate of the mobile phase can also improves the separation efficiency between Am and Eu. The nearly base separation was gained when the flow rate is 0.35 ml/min, the

Effect of pH on stability constants of Am(III)- and Cm(III)- humate complexes

International Nuclear Information System (INIS)

Samadfam, Mohammad; Jintoku, Takashi; Sato, Seichi; Ohashi, Hiroshi; Mitsugashira, Toshiaki; Hara, Mitsuo; Suzuki, Yoshimitsu

1999-01-01

The apparent stability constants of Am(III)- and Cm(III)-humate complexes were determined by dialysis method at ionic strength 0.1 in the pH range from 3.3 to 5.7 under N 2 bubbling. The Am(III) and Cm(III) loadings were about 10 -7 and 10 -10 mol/dm 3 . The concentrations of Am-241 and Cm-242 tracers were measured by α-spectrometry. It was found that the apparent stability constants were almost identical for both the Am(III)-humate and Cm(III)-humate complexes. The apparent stability constants showed a small pH-dependence, increasing from 10 4.6 at pH 3.3 to 10 5.1 at pH 5.7. The ionization of acidic functional groups of humic acid is possibly the primary factor. Above pH 6, the dialysis membrane was no langer permeable to Am(III) and Cm(III) ions and the apparent stability constant could not be experimentally obtained. The apparent stability constants between pH 6 and pH 8.5 were evaluated by considering that both binary metal-humate and ternary metal-hydroxo-humate complexes exist at pHs above 6. It was assumed that mono-hydroxo-humate complex Am(OH)HA and Cm(OH)HA are the major ternary complexes that exist below pH 9. The overall stability constants for Am(III)- and Cm(III)-humate complexes increased from 10 5.7 at pH 6 to 10 7.2 at pH 8. This implies that the formation of metal-hydroxo-humate species is preferred over the formation of hydroxide species. The apparent overall stability constants can be easily incorporated into geochemical modeling of trivalent actinide migration. The results of the present study show that the apparent stability constants determined experimentally at pH≤6 do not represent the complexation properties at higher pHs and the formation of ternary complexes should be considered in speciation calculations of radionuclides at terrestrial environment. (J.P.N.)

Articulación de fones en individuos clase esqueletal I,II y III Speech patterns in skeletal class I, II and III subjects

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Pía Villanueva

2009-09-01

Full Text Available OBJETIVO: determinar los patrones de articulación de fones consonánticos en sujetos de habla española chilena clases I, II y III esqueletal; comparar las diferencias fonéticas que existan entre clases esqueletales. MÉTODOS: se seleccionaron 54 individuos que cumplían con los criterios de inclusión determinados mediante un examen clínico intraoral y a través del análisis de Ricketts, y se conformaron los grupos de estudio de pacientes clases esqueletales I, II y III. Se les realizó un examen fonoarticulatorio estandarizado para determinar los fones modificados y el patrón articulatorio compensatorio realizado. RESULTADOS: se observaron cambios en el punto de articulación de fones consonánticos en las tres clases esqueletales, con diferencias significativas en los grupos de fones anteriores y medios entre pacientes clases I y II, sólo en el grupo de los fones anteriores entre pacientes I y III. Entre pacientes clases II y III no se observaron diferencias significativas. Se reportan modificaciones y compensaciones cualitativamente distintas entre las clases esqueletales. CONCLUSIONES: en relación a pacientes clase I, los pacientes clase II o III, presentan distinto grado de modificación en el punto de articulación de fones consonánticos. Las diferencias observadas se relacionan con los patrones esqueletales propios de cada clase.PURPOSE: to determine the consonant phonemes articulation patterns in Chilean skeletal class I, II and III Spanish speakers and compare their phonetic differences. METHODS: fifty-four skeletal class I, II and III subjects were selected, based on intraoral clinical examination and Ricketts cephalometric analysis, constituting the study groups. A standardized phonoarticulatory test was applied to each patient to determine the modified phonemes and their compensatory patterns. RESULTS: the findings indicate changes in articulation in all three groups. Significant differences were found in anterior and medium

CMPO-calix[4]arenes and the influence of structural modifications on the Eu(III), Am(III), Cm(III) separation

International Nuclear Information System (INIS)

Peters, C.; Braekers, D.; Desreux, J.F.; Kasyan, O.; Miroshnichenko, S.; Rudzevich, V.; Boehmer, V.

2008-01-01

The syntheses of new calix[4]arenes featuring CMPO groups on the wide rim are reported and the extraction of Am(III) and Eu(III) from concentrated HNO 3 aqueous phases are discussed with reference to the properties of the symmetric tetra-CMPO derivative 1. All extraction studies were conducted in the same experimental conditions which allows to directly compare the dependence of the distribution coefficients of various calixarenes on the acid concentration (0.1 M 3 ] < 5 M). Calix[4]arene 1 becomes a very poor extractant if the length of the aliphatic chain between the amide and phosphine oxide groups of CMPO is increased, if the bridging methylene groups are replaced by sulfur atoms or if the macrocyclic cavity size is increased. By contrast, mixed amide - CMPO calix[4]arenes are nearly as effective than 1. Moreover, Am(III)/Cm(III) separation coefficients between 1.5 and 3 have been obtained with unsymmetrical calix[4]arenes of type 1 with different aliphatic chains grafted on the narrow rim. Guidelines to anticipate the extraction ability of calix[4]arenes remain elusive because of the intricate solution behavior of these compounds. (orig.)

The sound of barking dogs: violence and terror among Salvadoran families in the postwar.

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Dickson-Gómez, Julia

2002-12-01

This article examines the transgenerational transmission of trauma among campensino living in a rural, repopulated community in El Salvador. Research with Holocaust survivors and their children has shown that traumatic symptoms can be transmitted to children who did not directly experience the Holocaust. The mechanisms by which this transgenerational transmission occurs have not been fully explored and require an expansion of medical and anthropological conceptualizations of posttraumatic illness. Through their reactions to and interpretations of everyday events, campesino parents who lived in the guerrilla camps explicitly transmit trauma to children who did not experience the recent civil war. Illness narratives by sufferers of nervios transmit trauma and point to the basic immorality of the war, an immorality that continues today. In addition, the symptoms of nervios constitute a mechanism by which trauma is implicitly transmitted. Symptoms of nervios point to what generally is not and, indeed, cannot be voiced: the destruction of primary relationships in the family and unresolved grief and helplessness, which, through the responses of family members to the sufferer, are reproduced and reenacted in the present family context.

Tumores malignos de la vaina nerviosa periférica como origen de dolor orofacial

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Jorge Chaurand-Lara

2016-07-01

Full Text Available Los tumores malignos de la vaina nerviosa periférica (TMVNP, también llamados neurofribrosarcomas o schwannomas malignos, representan el 10% de todos los sarcomas de tejidos blandos. El tumor usualmente se encuentra en las extremidades inferiores, y solo del 10 al 20% de las lesiones ocurren en la región de cabeza y cuello, convirtiéndolas en una entidad rara. Los neurofibromas son tumores de la vaina nerviosa que aparecen comúnmente en la neurofibromatosis 1 o enfermedad de Von Recklinghausen. Se ha reportado que los individuos con antecedentes familiares de neurofibromatosis 1 tienen un riesgo incrementado de desarrollar TMVNP en el transcurso de sus vidas, sin embargo, esta asociación no se ha confirmado en TMVNP a nivel de los nervios craneales. En este artículo los autores analizaron la literatura actual con respecto a los TMVNP del nervio trigémino, así como la inclusión de un caso inusual que involucra las 3 ramas de dicho nervio.

Heterobimetallic gadolinium(III)-iron(III) complex of DTPA-bis(3-hydroxytyramide)

International Nuclear Information System (INIS)

Parac-Vogt, Tatjana N.; Kimpe, Kristof; Binnemans, Koen

2004-01-01

A derivative of diethylenetriamine-N,N,N',N'',N''-pentaacetic acid (DTPA), carrying two catechol functional groups has been synthesised by the reaction between DTPA-bis(anhydride) and 3-hydroxytyramine (dopamine). The ligand DTPA-bis(3-hydroxytyramide), [DTPA(HTA) 2 ], is able to form stable heterobimetallic complexes with gadolinium(III) and iron(III) ions. The gadolinium(III) occupies the internal coordination cage of DTPA formed by three nitrogens, two carboxylate and two amide oxygens, while the [Fe(NTA)(H 2 O) 2 ] (nitrilotriacetic acid, NTA) binds to catechol units by the substitution of two water ligands. The formation of polymeric species was avoided by using the tripodal NTA ligand. The heterobimetallic complex was characterised by means of visible absorption spectroscopy, electron spray ionisation-mass spectrometry (ESI-MS), and nuclear magnetic resonance (NMR) spectroscopy

Separation of yttrium (III) from lanthanoids (III) by solvent extraction with substituted N-Alkylcarbonyl-N-phenylhydroxylamines

International Nuclear Information System (INIS)

Haraguchi, K.; Ogata, T.; Nakagawa, K.; Saitoh, T.; Kamidate, T.; Watanabe, H.

1996-01-01

A series of substituted N-alkylcarbonyl-N-phenylhydroxylamines(R-PHAs) were synthesized and utilized for the extraction of yttrium(III) and lanthanoids(III) in order to obtain effective extractants for the separation of yttrium(III) from the lanthanoids(III) and the mutual separation of the lanthanoids(III). The distribution ratio of yttrium(III) and the lanthanoids(III) between the carbon tetrachloride and the aqueous phases was measured as functions of the pH and the extractant concentration at 298 K at an ionic strength of 0.1 (NaNO 3 ). Yttrium(III) and the lanthanoids(III) were extracted with R-PHAs(HL) as self-adducted chelates of the form, ML 3 (HL) x , where 'x' is 1, 2 or 3 depending on the extraction system. The extractability of the metal ions decreased in the order of R-PHA having a primary, a secondary and a tertiary alkyl substituent attached to the carbonyl group because of the steric hindrance of the alkyl group. The separation factors for both Yb/Eu and Yb/Y pairs increased with increasing branching of the alkyl group of R-PHA. The excellent selectivity of R-PHAs having a tertiary alkyl group was attributable to a greater inductive effect of the tertiary alkyl group than those of the primary and secondary alkyl groups. The substituents at the phenyl group of R-PHAs gave no significant effect on the selectivity, while the extractability was enhanced considerably by introduction of electron withdrawing substituents at appropriate positions of the phenyl group of R-PHAs. (authors)

Separation by liquid-liquid extraction of actinides(III) from lanthanides(III) using new molecules: the picolinamides

International Nuclear Information System (INIS)

Cordier, P.Y.

1996-07-01

In the field of long-lived radionuclides separation from waste generated during spent fuel reprocessing, the picolinamides have been chosen as potential extractants for the selective extraction of actinides (III) from lanthanides (III). The first studies initiated on the most simple molecule of the picolinamide family, namely 2-pyridinecarboxamide, pointed out that in an aqueous media the complexation stability constant between this ligand and Am(III) is roughly 10 times higher than the ones corresponding to Ln(III). The synthesis of lipophilic derivatives of 2-pyridinecarboxamide leaded to extraction experiments. The extraction of metallic cation by lipophilic picolinamides, according to a solvatation mechanism, is strongly dependent on the nature of the amide function: a primary amide function (group I) leads to a good extraction; on the contrary, there is a decrease for secondary (group II) and tertiary (group III) amide functions. From a theoretical point of view, this work leads finally to the following conclusions: confirmation of the importance of the presence of soft donor atoms within the extractants (nitrogen in our case) for An(III)/Ln(III). Also, sensitivity of this soft donor atom regarding the protonation reaction; prevalence in our case of the affinity of the extractant for the metallic cation over the lipophilia of the extractant to ensure good distribution coefficients. The extraction and Am(III)/Ln(III) separation performances of the picolinamides from pertechnetic media leads to the design of a possible flowsheet for the reprocessing of high level liquid waste, with the new idea of an integrated technetium reflux. (author)

Removal of arsenic from water using manganese (III) oxide: Adsorption of As(III) and As(V).

Science.gov (United States)

Babaeivelni, Kamel; Khodadoust, Amid P

2016-01-01

Removal of arsenic from water was evaluated with manganese (III) oxide (Mn2O3) as adsorbent. Adsorption of As(III) and As(V) onto Mn2O3 was favorable according to the Langmuir and Freundlich adsorption equilibrium equations, while chemisorption of arsenic occurred according to the Dubinin-Radushkevich equation. Adsorption parameters from the Langmuir, Freundlich, and Temkin equations showed a greater adsorption and removal of As(III) than As(V) by Mn2O3. Maximum removal of As(III) and As(V) occurred at pH 3-9 and at pH 2, respectively, while removal of As(V) in the pH range of 6-9 was 93% (pH 6) to 61% (pH 9) of the maximum removal. Zeta potential measurements for Mn2O3 in As(III) was likely converted to As(V) solutions indicated that As(III) was likely converted to As(V) on the Mn2O3 surface at pH 3-9. Overall, the effective Mn2O3 sorbent rapidly removed As(III) and As(V) from water in the pH range of 6-9 for natural waters.

HLA in Brazilian Ashkenazic Jews with chronic dermatophytosis caused by Trichophyton rubrum Antígenos Leucocitários Humanos (HLA em Judeus Ashkenazitas Brasileiros portadores de dermatofitose crônica causada por Trichophyton rubrum

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Aya Sadahiro

2004-06-01

Full Text Available The frequency of HLA (Human Leucocyte Antigens was analyzed in 25 non-consanguineous Brazilian Ashkenazic Jews, resident in the city of São Paulo, Brazil, suffering from chronic dermatophytosis caused by T. rubrum, and in 25 non-infected individuals belonging to the same ethnic group. Statistically significant values (pA freqüência dos HLA foi analisada em 25 Judeus Ashkenazitas, não consangüíneos, residentes em São Paulo, Brasil, com dermatofitose crônica causada por T. rubrum e em 25 indivíduos sadios, pertencentes ao mesmo grupo étnico dos pacientes. Observou-se valor estatisticamente significante (p<0,05 para HLA-B14 associado a resistência à dermatofitose crônica enquanto HLA-DQB1*06 (p=0,05 possivelmente relacionado a susceptibilidade. Estes achados indicam que o desenvolvimento da dermatofitose crônica pode ser influenciado por genes localizados no cromossomo 6, na região do complexo principal de histocompatibilidade.

Association of trauma-related disorders and dissociation with four idioms of distress among Latino psychiatric outpatients.

Science.gov (United States)

Lewis-Fernández, Roberto; Gorritz, Magdaliz; Raggio, Greer A; Peláez, Clara; Chen, Henian; Guarnaccia, Peter J

2010-06-01

Past research on idioms of distress among U.S. Latinos has revealed that ataque de nervios and altered perceptions, such as hearing and seeing things when alone, are independent markers of higher morbidity and mental health utilization despite having no one-to-one relationships with any single psychiatric diagnosis. It has been proposed that the idioms exert this effect because they are signs of distressing dissociative capacity associated with traumatic exposure. This study examines the relationships in an ethnically diverse Latino psychiatric outpatient sample (N = 230) among interpersonal trauma, posttraumatic stress disorder (PTSD), major depressive disorder, dissociative capacity and four cultural idioms of distress associated with the popular overall category of nervios. We particularly explore how these relationships change with varied measures of traumatic exposure, including trauma severity and timing or persistence of trauma. A series of adjusted bivariate regressions assessed the matrix of associations between the idioms and the clinical variables. In this highly traumatized population, we identified a strong 'nexus' of associations between dissociation and three of the idioms: currently being ill with nerves, ataque de nervios and altered perceptions. These idioms were largely independent from PTSD and depression and were associated with trauma persistence and severity. A fourth idiom, being nervous since childhood, was not associated with any other variable and may represent a personality trait rather than a diagnosable condition. Our results validate the clinical utility of the construct of nervios as a set of specific idioms associated with dissociation that are useful markers of mental health need among Latinos independently of their association with clinical diagnoses.

Carbonato-bridged Ni(II)2Ln(III)2 (Ln(III) = Gd(III), Tb(III), Dy(III)) complexes generated by atmospheric CO2 fixation and their single-molecule-magnet behavior: [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(MeOH or H2O)Ln(III)(NO3)}2]·solvent [3-MeOsaltn = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato].

Science.gov (United States)

Sakamoto, Soichiro; Fujinami, Takeshi; Nishi, Koshiro; Matsumoto, Naohide; Mochida, Naotaka; Ishida, Takayuki; Sunatsuki, Yukinari; Re, Nazzareno

2013-06-17

Atmospheric CO2 fixation of [Ni(II)(3-MeOsaltn)(H2O)2]·2.5H2O [3-MeOsaltn = N,N'-bis(3-methoxy-2-oxybenzylidene)-1,3-propanediaminato], Ln(III)(NO3)3·6H2O, and triethylamine occurred in methanol/acetone, giving a first series of carbonato-bridged Ni(II)2Ln(III)2 complexes [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(MeOH)Ln(III)(NO3)}2] (1Gd, 1Tb, and 1Dy). When the reaction was carried out in acetonitrile/water, it gave a second series of complexes [(μ4-CO3)2{Ni(II)(3-MeOsaltn)(H2O)Ln(III)(NO3)}2]·2CH3CN·2H2O (2Gd, 2Tb, and 2Dy). For both series, each Ni(II)2Ln(III)2 structure can be described as two di-μ-phenoxo-bridged Ni(II)Ln(III) binuclear units bridged by two carbonato CO3(2-) units to form a carbonato-bridged (μ4-CO3)2{Ni(II)2Ln(III)2} structure. The high-spin Ni(II) ion has octahedral coordination geometry, and the Ln(III) ion is coordinated by O9 donor atoms from Ni(II)(3-MeOsaltn), bidentate NO3(-), and one and two oxygen atoms of two CO3(2-) ions. The NO3(-) ion for the first series roughly lie on Ln-O(methoxy) bonds and are tilted toward the outside, while for the second series, the two oxygen atoms roughly lie on one of the Ln-O(phenoxy) bonds due to the intramolecular hydrogen bond. The temperature-dependent magnetic susceptibilities indicated a ferromagnetic interaction between the Ni(II) and Ln(III) ions (Ln(III) = Gd(III), Tb(III), Dy(III)) for all of the complexes, with a distinctly different magnetic behavior between the two series in the lowest-temperature region due to the Ln(III)-Ln(III) magnetic interaction and/or different magnetic anisotropies of the Tb(III) or Dy(III) ion. Alternating-current susceptibility measurements under the 0 and 1000 Oe direct-current (dc) bias fields showed no magnetic relaxation for the Ni(II)2Gd(III)2 complexes but exhibited an out-of-phase signal for Ni(II)2Tb(III)2 and Ni(II)2Dy(III)2, indicative of slow relaxation of magnetization. The energy barriers, Δ/kB, for the spin flipping were estimated from the Arrhenius

Complexes between lanthanide (III) and yttrium (III) picrates and tetra methylene sulfoxide as ligand

International Nuclear Information System (INIS)

Silva, M.A.A. da.

1991-01-01

The preparation and characterization of addition compounds between lanthanide (III) and yttrium (III) picrates and tetra methylene sulfoxide as ligand were described. The adducts were prepared in the molar relation 1 (salt): 3(ligand) in ethanol. They are microcrystalline with more intense color than those of their respective hydrated salts. At room temperature conditions they are non hygroscopic and do not present perceptible alterations. They became slightly opalescent, when heated between 363 and 423 K. At higher temperatures under several heating ratios, the behavior shown is the same: melting between 439 and 472 K. The characterization of the compounds was made by elemental analysis, electrolytic conductance measurements, X-ray powder patterns, infrared spectroscopy, visible electronic absorption and emission spectra of the neodymium (III) and europium (III), respectively. (author). 116 refs., 17 tabs., 11 figs

Efectividad de la movilización neuromeníngea frente a la efectividad del ejercicio terapéutico en pacientes con lumbociática crónica.

OpenAIRE

Val Sánchez, Natalia del

2010-01-01

La lumbociática crónica es una afectación de las raíces L4-L5, L5-S1 del nervio ciático cuyas manifestaciones clínicas: dolor, alteraciones sensitivas, motoras y de reflejos, se mantienen durante tres o más meses; es una patología que afecta al 40% de la población en países desarrollados y causa frecuente de absentismo laboral. El objetivo principal del estudio piloto aleatorizado controlado a simple ciego, es comparar la efectividad de la Movilización Neuromeníngea del nervio ...

DSM-III-R and religion.

Science.gov (United States)

Post, S G

1992-07-01

The interpretation of religion in DSM-III-R contains considerable negative bias and contributes to unfair stereotypes of religious persons. Particularly new religious movements and religious conversion are unfairly interpreted under the DSM-III-R heading, 'Dissociative Disorder Not Otherwise Specified'. It is suggested that a more balanced and respectful interpretation of religion is needed in DSM-III-R, since psychiatry through its official nomenclature should not contribute to social intolerance of religious nonconformity.

Determination of Cu(III) and Cu(II)+Cu(III) in superconducting copper ceramics

International Nuclear Information System (INIS)

Nedelcheva, T.; Kostadinova, L.; Stoyanova-Ivanova, A.; Ivanova, I.

1992-01-01

Copper(III) and total copper in superconducting Y-Ba-Cu oxide and related compounds can be determinated by two successive iodimetric titrations after the sample has been dissolved under Ar in HCl/KI medium. First, the iodine equivalent to copper(III) is titrated with Na 2 S 2 O 3 solution at pH 4.8, copper(II) being masked with EDTA. The total copper is then determined in the same solution by demasking with acid and iodide, followed by iodimetric titration. The method is both accurate and reproducible. The relative standard deviations for 1.074% copper(III) and 23.37% total copper are 0.8% and 0.3%, respectively. (orig.)

Perdas causadas por Coccus viridis (Hemiptera: Coccidae em mudas de Coffea arabica L.

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Flávio Lemes Fernandes

2009-08-01

Full Text Available Coccus viridis (Green danifica plantas jovens e adultas de Coffea arabica Linnaeu. No entanto, nada se sabe sobre a magnitude dos danos causados por esta praga. Assim, este trabalho teve por objetivo estudar as relações entre o ataque de C. viridis e as perdas causadas por este inseto a C. arabica. Este trabalho foi conduzido em casa de vegetação na Universidade Federal de Viçosa. Foram utilizadas sementes da linhagem IAC 15 da variedade “Catuaí vermelho” de café (C. arabica. Para a confecção dos tratamentos esta praga foi criada em casa de vegetação separada do experimento. Os tratamentos foram: plantas infestadas e não infestadas por adultos e ninfas da cochonilha verde. As plantas foram nutridas com solução nutritiva. Durante 110 dias foram avaliados: números de adultos e de ninfas de primeiro, segundo e terceiro ínstares, área foliar, diâmetro do caule, altura das plantas em todas repetições. No final do experimento avaliou-se o peso das raízes, caule, folhas e total. Os pesos das raízes, matéria seca total, área foliar e diâmetro do caule de plantas não atacadas por C. viridis superaram em 1,31; 1,41; 1,50 e 8,93 vezes, respectivamente o peso de plantas atacadas. As variáveis selecionadas foram: diâmetro do caule (cm, área foliar (cm², peso de raízes (g, ninfas, adultos e total das cochonilhas. Concluindo que a planta de C. arabica é afetada de forma diferente entre seus órgãos e que a ninfa de terceiro ínstar e adultos são as fases que mais causam danos a C. arabica.Losses Caused by Coccus viridis (Green (Hemiptera: Coccidae on Seedlings of Coffea arabica L.Abstract. Coccus viridis (Green cause losses on seedling and old plants of Coffea arabica (Green. However, nothing is known about of the damages caused by this pest. Thus, the objective of this work was to evaluate the relations between atack of C. viridis and the losses caused by this insect. on C. arabica. This work was conduced in greenhouse at

Jejunal perforation caused by abdominal angiostrongyliasis Perfuração jejunal causada por angiostrongilíase abdominal

Directory of Open Access Journals (Sweden)

Jaques WAISBERG

1999-09-01

Full Text Available The authors describe a case of abdominal angiostrongyliasis in an adult patient presenting acute abdominal pain caused by jejunal perforation. The case was unusual, as this affliction habitually involves the terminal ileum, appendix, cecum or ascending colon. The disease is caused by the nematode Angiostrongylus costaricensis, whose definitive hosts are forest rodents while snails and slugs are its intermediate hosts. Infection in humans is accidental and occurs via the ingestion of snail or slug mucoid secretions found on vegetables, or by direct contact with the mucus. Abdominal angiostrongyliasis is clinically characterized by prolonged fever, anorexia, abdominal pain in the right-lower quadrant, and peripheral blood eosinophilia. Although usually of a benign nature, its course may evolve to more complicated forms such as intestinal obstruction or perforation likely to require a surgical approach. Currently, no efficient medication for the treatment of abdominal angiostrongyliasis is known to be available. In this study, the authors provide a review on the subject, considering its etiopathogeny, clinical picture, diagnosis and treatment.Os autores descrevem caso de angiostrongilíase abdominal em doente adulto que se manifestou como abdômen agudo devido à perfuração de alça jejunal, evento raro, uma vez que esta afecção geralmente envolve o íleo terminal, apêndice, ceco ou cólon ascendente. A doença é causada pelo nematódeo Angiostrongylus costaricensis cujos hospedeiros definitivos são roedores silvestres e os hospedeiros intermediários são caracóis e caramujos. A infecção em humanos é acidental e ocorre pela ingestão de secreção mucóide destes invertebrados presentes em vegetais ou por contato direto com o muco. A angiostrongilíase abdominal é clinicamente caracterizada pela presença de febre prolongada, anorexia, dor no quadrante inferior direito do abdômen e eosinofilia periférica. Embora a doença seja de

Speciation of Am(III)/Eu(III) sorbed on γ-alumina. Effect of metal ion concentration

International Nuclear Information System (INIS)

Kumar, S.; Tomar, B.S.; Godbole, S.V.

2013-01-01

The present paper describes the speciation of Am(III)/Eu(III) sorbed on γ-alumina, and its evolution with changing metal ion concentration, studied using batch sorption experiment, time resolved fluorescence spectroscopy (TRFS), extended X-ray absorption fine structure (EXAFS) and surface Complexation modeling (SCM). Though numerous studies exist in the literature on the speciation of trivalent actinides and lanthanides on alumina surface, the mechanism of sorption at high metal ion concentrations is not yet fully understood. Batch sorption experiments of Am(III) on γ-alumina under varying condition of pH (3-10), ionic strength (0.005-0.1 M NaClO 4 ) and metal ion concentration (10 -7 -10 -4 M) were performed. Higher metal ion concentration was achieved by the addition of Eu(III) considering it as an analogue of Am(III). Time resolved fluorescence spectroscopy (TRFS) study of Eu(III) sorbed on γ-alumina at the metal ion concentration of 5.0 x 10 -5 M was carried out over pH 4 to 7. TRFS showed the presence of two surface species, with distinctly different fluorescence decay life times. The shorter lifetime value and its changing pattern with pH indicate the surface species corresponding to this component to be monodentate species > AlOAm 2+ and its hydrolyzed forms. The sorbed Eu 3+ species corresponding to the longer lifetime value has 2-3 water molecules in its first coordination sphere and is multidentate in its binding on alumina surface. Extended X-ray absorption fine structure (EXAFS) measurement of Eu:γ-Al 2 O 3 sorption systems at pH 6.18 and 7.15 corroborate the existence of two surface complexes. Further it suggests the edge sharing bidentate binding of Eu on AlO 6 octahedra as the co-ordination mode of the higher lifetime component. Surface Complexation Modeling (SCM) of Am(III)/Eu(III) sorption onto γ-alumina at pH ≤7 has been carried out using these two surface species. 2-pK surface complexation modeling coupled with constant capacitance model

Mastite micótica em ruminantes causada por leveduras Mycotic mastitis in ruminants caused by yeasts

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Andréia Spanamberg

2009-02-01

Full Text Available A ocorrência de casos esporádicos de mastite causados por microrganismos de origem ambiental pode ser considerada como emergente e as leveduras, os fungos leveduriformes e os filamentosos são alguns dos principais agentes envolvidos. Em relação à mastite micótica, as leveduras são freqüentemente causas de infecções da glândula mamária em animais produtores de leite. A maior parte dos casos ocorre sob a forma de surtos localizados e/ou após tratamento com antimicrobianos. Os principais gêneros envolvidos são Candida e Cryptococcus, além de outros como Geotrichum, Pichia e Trichosporon. O objetivo do trabalho é revisar os aspectos gerais sobre a mastite micótica causada por leveduras e fungos leveduriformes, tais como etiologia, causas predisponentes, patogenicidade, diagnóstico, tratamento e profilaxia por meio de uma abordagem cronológica dos primeiros relatos, mas com enfoque principal nos resultados descritos recentemente na literatura veterinária nacional e internacional. O controle da mastite micótica é fundamentado em métodos preventivos, como adequado manejo da ordenha, correta higienização dos equipamentos e das instalações, com a finalidade de reduzir o número de animais acometidos, além de garantir a qualidade e a inocuidade dos produtos lácteos.The veterinary literature registers sporadic cases of infections caused by environmental microorganisms in which the main agents involved are yeasts, yeasts-like and filamentous fungi. In relation to dairy animals, the yeasts are more frequently incriminated as the aetiological agents of mycotic mastitis. Most cases occur under the form of localized outbreaks and / or after treatment with antimicrobial agents. The main genera involved in mastitis are Candida and Cryptococcus, besides others such as Geotrichum, Pichia and Trichosporon. The purpose of this review is to point out the main aspects of mastitis caused by yeasts and yeast-like fungi, such as etiology

Organometallic neptunium(III) complexes.

Science.gov (United States)

Dutkiewicz, Michał S; Farnaby, Joy H; Apostolidis, Christos; Colineau, Eric; Walter, Olaf; Magnani, Nicola; Gardiner, Michael G; Love, Jason B; Kaltsoyannis, Nikolas; Caciuffo, Roberto; Arnold, Polly L

2016-08-01

Studies of transuranic organometallic complexes provide a particularly valuable insight into covalent contributions to the metal-ligand bonding, in which the subtle differences between the transuranium actinide ions and their lighter lanthanide counterparts are of fundamental importance for the effective remediation of nuclear waste. Unlike the organometallic chemistry of uranium, which has focused strongly on U(III) and has seen some spectacular advances, that of the transuranics is significantly technically more challenging and has remained dormant. In the case of neptunium, it is limited mainly to Np(IV). Here we report the synthesis of three new Np(III) organometallic compounds and the characterization of their molecular and electronic structures. These studies suggest that Np(III) complexes could act as single-molecule magnets, and that the lower oxidation state of Np(II) is chemically accessible. In comparison with lanthanide analogues, significant d- and f-electron contributions to key Np(III) orbitals are observed, which shows that fundamental neptunium organometallic chemistry can provide new insights into the behaviour of f-elements.

Diglycolic acid modified zirconium phosphate and studies on the extraction of Am(III) and Eu(III) from dilute nitric acid medium

Energy Technology Data Exchange (ETDEWEB)

Selvan, B. Robert; Suneesh, A.S.; Venkatesan, K.A.; Antony, M.P. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India). Fuel Chemistry Division; Dasthaiah, K.; Gardas, R.L. [Indian Institute of Technology - Madras, Chennai (India). Dept. of Chemistry

2017-06-01

Diglycolic acid modified zirconium phosphate (ZrP-DGA) was prepared and studied for the extraction of Am(III) and Eu(III) from dilute nitric acid medium. The distribution coefficient (K{sub d}, mL.g{sup -1}) of Am(III) and Eu(III) was measured as a function of time, pH and concentration of Eu(III) ion etc. The K{sub d} of Am(III) and Eu(III) increased with increase of pH, reached a maximum value of distribution coefficient at pH 1.5 - 2, followed by decrease in K{sub d} values. Rapid extraction of Am(III) and Eu(III) in ZrP-DGA was observed followed by the establishment of equilibrium occurred in 100 min. Kinetics of extraction was fitted in to pseudo second order rate equation. The amount of Eu(III) loaded in ZrP-DGA increased with increase in the concentration of Eu(III) ion in aqueous phase and the isotherm was fitted in to Langmuir and Freundlich adsorption models. The extraction of Am(III) in ZrP-DGA was higher as compared to Eu(III) and the interference of Eu(III) on the extraction of Am(III) was studied. The distribution coefficient of some lanthanides in ZrP-DGA was measured and the K{sub d} of lanthanides increased across the lanthanide series. The extracted trivalent metal ions were recovered in three contacts of loaded ZrP-DGA with 0.5 M nitric acid.

Cytomegalovirus and other herpesviruses infections in heart and bone marrow transplant recipients Infecções causadas por citomegalovírus e outros vírus do grupo herpes em transplantados cardíacos e de medula óssea

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Adriana Weinberg

1990-10-01

Full Text Available From January 1988 to January 1989 all the heart transplant and bone marrow recipients at the Instituto do Coração of the Hospital das Clínicas of the University of São Paulo Medical School were studied for the incidence and morbidity associated with herpesviruses infections after transplantation. Five bone marrow and 5 heart transplant recipients were followed for a mean of 4.2 months post-transplantation. All the patients were seropositive for cytomegalovirus (CMV before admission and 80% experienced one or more recurrences during the observation period. Of the 12 episodes of CMV infection, that were identified in this study, 83% were accompanied by clinical or laboratory abnormalities. However, there was only one case of severe disease. The overall incidence of infection for herpes simplex (HSV was 50%. Although most of HSV reactivations were oral or genital, one case of HSV hepatitis occurred. One of the 6 episodes of HSV infections that were treated with acyclovir showed an unsatisfactory response and was successfully managed with ganciclovir. All the individuals had anti-varicella zoster virus antibodies, but none of them developed infection. The study emphasizes the importance of active diagnostic surveillance of herpesvirus infections in transplant patients. Both CMV and HSV reactivations showed high incidence and important morbidity and thus, deserve prophylactic therapy.De janeiro de 1988 a janeiro de 1989 todos os pacientes submetidos a transplante de coração ou de medula óssea no Instituto do Coração do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo foram estudados quanto à incidência e morbidade das infecções pós-transplante causadas por vírus do grupo herpes. Cinco recipientes de medula óssea e 5 transplantados cardíacos foram observados por um período médio de 4.2 meses após o transplante. Todos os pacientes tinham sorologia positiva para citomegalovírus (CMV antes do transplante

Temporal development of cross-neutralization between HTLV-III B and HTLV-III RF in experimentally infected chimpanzees

NARCIS (Netherlands)

Goudsmit, J.; Thiriart, C.; Smit, L.; Bruck, C.; Gibbs, C. J.

1988-01-01

Sera from chimpanzees inoculated respectively with HTLV-III B, LAV, HTLV-III RF and brain tissue from an AIDS patient were analysed for neutralizing activity by two methods: a cell fusion inhibition test (CFI) using HTLV-III B infected cells as inoculum and CD4+ cells as target and a replication

Radiometric titration of thallium(III) with EDTA

International Nuclear Information System (INIS)

Rao, V.R.S.; Pulla Rao, Ch.; Tataiah, G.

1978-01-01

Radioactive solutions containing very small amounts of thallium(III) can be determined by radiometric titration using ammonia as hydrolysing agent. Aqueous solution of thallium(I) (both inactive and radioactive) is treated with bromine water till the appearance of the brown colour of bromine, and the solution is warmed to 80 deg C to expel the excess bromine. By this procedure all thallium(I) is quantitatively oxidised to thallium(III). An aqueous solution of ammonia is added to precipitate thallium(III) as thallic oxide. It is then filtered, washed with water to free it from bromide and then dissolved in 2N HCl and the solution is then standardised. 2 ml of this solution is transferred to a 20 ml volumetric flask, 1 ml of radioactive thallium(III) solution to be standardised is added as well as incremental amounts of EDTA solution and mixed thoroughly. Uncomplexed thallium(III) is then precipitated by the addition of an ammonia solution and diluted to 20 ml. Required amount of this mixture is centrifuged. The beta activity of the supernatant aliquot is measured using a GM counter. Quantitative determination of Tl(III) in the range of 1-10 μM can be carried out. The interference of cations such as Au(III), iron(III), Ga(III) can be eliminated by pretreatment of the Tl(III) solution before carrying out radiometric titration. The results obtained are reproducible and accurate to +-3%. (T.I.)

Single-molecule magnetism in three related {Co(III)2Dy(III)2}-acetylacetonate complexes with multiple relaxation mechanisms.

Science.gov (United States)

Langley, Stuart K; Chilton, Nicholas F; Moubaraki, Boujemaa; Murray, Keith S

2013-06-17

Three new heterometallic complexes with formulas of [Dy(III)2Co(III)2(OMe)2(teaH)2(acac)4(NO3)2] (1), [Dy(III)2Co(III)2(OH)2(teaH)2(acac)4(NO3)2]·4H2O (2), and [Dy(III)2Co(III)2(OMe)2(mdea)2(acac)4(NO3)2] (3) were characterized by single-crystal X-ray diffraction and by dc and ac magnetic susceptibility measurements. All three complexes have an identical "butterfly"-type metallic core that consists of two Dy(III) ions occupying the "body" position and two diamagnetic low-spin Co(III) ions occupying the outer "wing-tips". Each complex displays single-molecule magnet (SMM) behavior in zero applied magnetic field, with thermally activated anisotropy barriers of 27, 28, and 38 K above 7.5 K for 1-3, respectively, as well as observing a temperature-independent mechanism of relaxation below 5 K for 1 and 2 and at 3 K for 3, indicating fast quantum tunneling of magnetization (QTM). A second, faster thermally activated relaxation mechanism may also be active under a zero applied dc field as derived from the Cole-Cole data. Interestingly, these complexes demonstrate further relaxation modes that are strongly dependent upon the application of a static dc magnetic field. Dilution experiments that were performed on 1, in the {Y(III)2Co(III)2} diamagnetic analog, show that the slow magnetic relaxation is of a single-ion origin, but it was found that the neighboring ion also plays an important role in the overall relaxation dynamics.

III-V microelectronics

CERN Document Server

Nougier, JP

1991-01-01

As is well known, Silicon widely dominates the market of semiconductor devices and circuits, and in particular is well suited for Ultra Large Scale Integration processes. However, a number of III-V compound semiconductor devices and circuits have recently been built, and the contributions in this volume are devoted to those types of materials, which offer a number of interesting properties. Taking into account the great variety of problems encountered and of their mutual correlations when fabricating a circuit or even a device, most of the aspects of III-V microelectronics, from fundamental p

Antithrombin III for critically ill patients

DEFF Research Database (Denmark)

Allingstrup, Mikkel; Wetterslev, Jørn; Ravn, Frederikke B

2016-01-01

PURPOSE: Antithrombin III (AT III) is an anticoagulant with anti-inflammatory properties. We assessed the benefits and harms of AT III in critically ill patients. METHODS: We searched from inception to 27 August 2015 in CENTRAL, MEDLINE, EMBASE, CAB, BIOSIS and CINAHL. We included randomized...... participants). However, for all other outcome measures and analyses, the results did not reach statistical significance. CONCLUSIONS: There is insufficient evidence to support AT III substitution in any category of critically ill participants including those with sepsis and DIC. AT III did not show an impact...

A view from Cheyenne Mountain: Generation III's perspective of Keystone III.

Science.gov (United States)

Bliss, Erika; Cadwallader, Kara; Steyer, Terrence E; Clements, Deborah S; Devoe, Jennifer E; Fink, Kenneth; Khubesrian, Marina; Lyons, Paul; Steiner, Elizabeth; Weismiller, David

2014-01-01

In October 2000 the family of family medicine convened the Keystone III conference at Cheyenne Mountain Resort. Keystone III participants included members of Generation I (entered practice before 1970), Generation II (entered 1970-1990), and Generation III (entered after 1990). They represented a wide range of family physicians, from medical students to founders of the discipline, and from small-town solo practice to academic medicine. During the conference, the three generations worked together and separately thinking about the past, present, and future of family medicine, our roles in it, and how the understanding of a family physician and our discipline had and would continue to evolve. After the conference, the 10 Generation III members wrote the article published here, reflecting on our experiences as new physicians and physicians in training, and the similarities and differences between our experiences and those of physicians in Generations I and II. Key similarities included commitment to whole-person care, to a wide scope of practice, to community health, and to ongoing engagement with our discipline. Key differences included our understanding of availability, the need for work-life balance, the role of technology in the physician-patient relationship, and the perceptions of the relationship between medicine and a range of outside forces such as insurance and government. This article, presented with only minor edits, thus reflects accurately our perceptions in late 2000. The accompanying editorial reflects our current perspective.

Parotidectomía y vena facial Parotidectomy and facial vein

Directory of Open Access Journals (Sweden)

F. Hernández Altemir

2009-10-01

Full Text Available La cirugía de los tumores benignos de la parótida, es una cirugía de relaciones con estructuras fundamentalmente nerviosas cuyo daño, representa un gravísimo problema psicosomático por definirlo de una manera genérica. Para ayudar al manejo quirúrgico del nervio facial periférico, es por lo que en el presente artículo tratamos de enfatizar la importancia de la vena facial en la disección y conservación del nervio, precisamente donde su disección suele ser más comprometida, esto es en las ramas más caudales. El trabajo que vamos a desarrollar hay que verlo pues, como un ensalzamiento de las estructuras venosas en el seguimiento y control del nervio facial periférico y de porqué no, el nervio auricular mayor no siempre suficientemente valorado en la cirugía de la parótida al perder protagonismo con el facial.Benign parotid tumor surgery is related to fundamental nervous structures, defined simply: that when damaged cause great psychosomatic problems. In order to make peripheral facial nerve surgery easy to handle for the surgeon this article emphasizes the importance of the facial vein in the dissection and conservation of the nerve. Its dissection can be compromised if the caudal branches are damaged. The study that we develop should be seen as praise for the vein structures in the follow up and control of the peripheral facial nerve, and the main auricular nerve that is often undervalued when it is no longer the protagonist in the face.

Spectroscopic investigations on the complexation of Cm(III) and Eu(III) with organic model ligands and their binding mode in human urine (in vitro); Spektroskopische Untersuchungen zur Komplexbildung von Cm(III) und Eu(III) mit organischen Modellliganden sowie ihrer chemischen Bindungsform in menschlichem Urin (in vitro)

Energy Technology Data Exchange (ETDEWEB)

Heller, Anne

2011-10-26

In case of incorporation, trivalent actinides (An(III)) and lanthanides (Ln(III)) pose a serious health risk to humans. An(III) are artificial, highly radioactive elements which are mainly produced during the nuclear fuel cycle in nuclear power plants. Via hazardous accidents or nonprofessional storage of radioactive waste, they can be released in the environment and enter the human food chain. In contrast, Ln(III) are nonradioactive, naturally occurring elements with multiple applications in technique and medicine. Consequently it is possible that humans get in contact and incorporate both, An(III) and Ln(III). Therefore, it is of particular importance to elucidate the behaviour of these elements in the human body. While macroscopic processes such as distribution, accumulation and excretion are studied quite well, knowledge about the chemical binding form (speciation) of An(III) and Ln(III) in various body fluids is still sparse. In the present work, for the first time, the speciation of Cm(III) and Eu(III) in natural human urine (in vitro) has been investigated spectroscopically and the formed complex identified. For this purpose, also basic investigations on the complex formation of Cm(III) and Eu(III) in synthetic model urine as well as with the urinary relevant, organic model ligands urea, alanine, phenylalanine, threonine and citrate have been performed and the previously unknown complex stability constants determined. Finally, all experimental results were compared to literature data and predictions calculated by thermodynamic modelling. Since both, Cm(III) and Eu(III), exhibit unique luminescence properties, particularly the suitability of time-resolved laser-induced fluorescence spectroscopy (TRLFS) could be demonstrated as a method to investigate these metal ions in untreated, complex biofluids. The results of this work provide new scientific findings on the biochemical reactions of An(III) and Ln(III) in human body fluids on a molecular scale and

Antithrombin III for critically ill patients

DEFF Research Database (Denmark)

Allingstrup, Mikkel; Wetterslev, Jørn; Ravn, Frederikke B

2016-01-01

Background: Critical illness is associated with uncontrolled inflammation and vascular damage which can result in multiple organ failure and death. Antithrombin III (AT III) is an anticoagulant with anti-inflammatory properties but the efficacy and any harmful effects of AT III supplementation...... in critically ill patients are unknown. This review was published in 2008 and updated in 2015.  Objectives: To examine: 1. The effect of AT III on mortality in critically ill participants. 2. The benefits and harms of AT III. We investigated complications specific and not specific to the trial intervention......, bleeding events, the effect on sepsis and disseminated intravascular coagulation (DIC) and the length of stay in the intensive care unit (ICU) and in hospital in general.  Search methods: We searched the following databases from inception to 27 August 2015: Cochrane Central Register of Controlled Trials...

Addition compounds of lanthamide (III) and yttrium (III) hexafluorophosphates and N,N - dimethylformamide

International Nuclear Information System (INIS)

Braga, L.S.P.

1983-01-01

Addition compounds of lanthanide (III) and yttrium (III) hexafluorophosphates and N-N-Dimetylformamide are described to characterize the complexes, elemental analysis, melting ranges, molar conductance measurements, X-ray powder patters infrared and Raman spectra, TG and DTA curves, are studied. Information concerning the decomposition of the adducts through the thermogravimetric curves and the differential thermal analysis curves is obtained. (M.J.C.) [pt

Characterization of Fe (III)-reducing enrichment culture and isolation of Fe (III)-reducing bacterium Enterobacter sp. L6 from marine sediment.

Science.gov (United States)

Liu, Hongyan; Wang, Hongyu

2016-07-01

To enrich the Fe (III)-reducing bacteria, sludge from marine sediment was inoculated into the medium using Fe (OH)3 as the sole electron acceptor. Efficiency of Fe (III) reduction and composition of Fe (III)-reducing enrichment culture were analyzed. The results indicated that the Fe (III)-reducing enrichment culture with the dominant bacteria relating to Clostridium and Enterobacter sp. had high Fe (III) reduction of (2.73 ± 0.13) mmol/L-Fe (II). A new Fe (III)-reducing bacterium was isolated from the Fe (III)-reducing enrichment culture and identified as Enterobacter sp. L6 by 16S rRNA gene sequence analysis. The Fe (III)-reducing ability of strain L6 under different culture conditions was investigated. The results indicated that strain L6 had high Fe (III)-reducing activity using glucose and pyruvate as carbon sources. Strain L6 could reduce Fe (III) at the range of NaCl concentrations tested and had the highest Fe (III) reduction of (4.63 ± 0.27) mmol/L Fe (II) at the NaCl concentration of 4 g/L. This strain L6 could reduce Fe (III) with unique properties in adaptability to salt variation, which indicated that it can be used as a model organism to study Fe (III)-reducing activity isolated from marine environment. Copyright © 2015 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.

A binuclear Fe(III)Dy(III) single molecule magnet. Quantum effects and models.

Science.gov (United States)

Ferbinteanu, Marilena; Kajiwara, Takashi; Choi, Kwang-Yong; Nojiri, Hiroyuki; Nakamoto, Akio; Kojima, Norimichi; Cimpoesu, Fanica; Fujimura, Yuichi; Takaishi, Shinya; Yamashita, Masahiro

2006-07-19

The binuclear [FeIII(bpca)(mu-bpca)Dy(NO3)4], having Single Molecule Magnet (SMM) properties, belonging to a series of isostructural FeIIILnIII complexes (Ln = Eu, Gd, Tb, Dy, Ho) and closely related FeIILnIII chain structures, was characterized in concise experimental and theoretical respects. The low temperature magnetization data showed hysteresis and tunneling. The anomalous temperature dependence of Mössbauer spectra is related to the onset of magnetic order, consistent with the magnetization relaxation time scale resulting from AC susceptibility measurements. The advanced ab initio calculations (CASSCF and spin-orbit) revealed the interplay of ligand field, spin-orbit, and exchange effects and probed the effective Ising nature of the lowest states, involved in the SMM and tunneling effects.

9,10-phenanthrenesemiquinone radical complexes of ruthenium(III), osmium(III) and rhodium(III) and redox series.

Science.gov (United States)

Biswas, Manas Kumar; Patra, Sarat Chandra; Maity, Amarendra Nath; Ke, Shyue-Chu; Weyhermüller, Thomas; Ghosh, Prasanta

2013-05-14

Reactions of 9,10-phenanthrenequinone (PQ) in toluene with [M(II)(PPh3)3X2] at 298 K afford green complexes, trans-[M(PQ)(PPh3)2X2] (M = Ru, X = Cl, 1; M = Os, X = Br, 2) in moderate yields. Reaction of anhydrous RhCl3 with PQ and PPh3 in boiling ethanol affords the dark brown paramagnetic complex, cis-[Rh(PQ)(PPh3)2Cl2] (3) in good yields. Diffusion of iodine solution in n-hexane to the trans-[Os(PQ) (PPh3)2(CO)(Br)] solution in CH2Cl2 generates the crystals of trans-[Os(PQ)(PPh3)2(CO)(Br)](+)I3(-), (4(+))I3(-)), in lower yields. Single crystal X-ray structure determinations of 1·2toluene, 2·CH2Cl2 and 4(+)I3(-), UV-vis/NIR absorption spectra, EPR spectra of 3, electrochemical activities and DFT calculations on 1, 2, trans-[Ru(PQ)(PMe3)2Cl2] (1Me), trans-[Os(PQ)(PMe3)2Br2] (2Me), cis-[Rh(PQ)(PMe3)2Cl2] (3Me) and their oxidized and reduced analogues including trans-[Os(PQ)(PMe3)2(CO)(Br)](+) (4Me(+)) substantiated that 1-3 are the 9,10-phenanthrenesemiquinone radical (PQ(˙-)) complexes of ruthenium(III), osmium(III) and rhodium(III) and are defined as trans/cis-[M(III)(PQ(˙-))(PPh3)2X2] with a minor contribution of the resonance form trans/cis-[M(II)(PQ)(PPh3)2X2]. Two comparatively longer C-O (1.286(4) Å) and the shorter C-C lengths (1.415(7) Å) of the OO-chelate of 1·2toluene and 2·CH2Cl2 and the isotropic fluid solution EPR signal at g = 1.999 of 3 are consistent with the existence of the reduced PQ(˙-) ligand in 1-3 complexes. Anisotropic EPR spectra of the frozen glasses (g11 = g22 = 2.0046 and g33 = 1.9874) and solids (g11 = g22 = 2.005 and g33 = 1.987) instigate the contribution of the resonance form, cis-[Rh(II)(PQ)(PPh3)2Cl2] in 3. DFT calculations established that the closed shell singlet (CSS) solutions of 1Me and 2Me are unstable due to open shell singlet (OSS) perturbation. However, the broken symmetry (BS) (1,1) Ms = 0 solutions of 1Me and 2Me are respectively 22.6 and 24.2 kJ mole(-1) lower in energy and reproduced the experimental bond

Simultaneous Oxidation and Sequestration of As(III) from Water by Using Redox Polymer-Based Fe(III) Oxide Nanocomposite.

Science.gov (United States)

Zhang, Xiaolin; Wu, Mengfei; Dong, Hao; Li, Hongchao; Pan, Bingcai

2017-06-06

Water decontamination from As(III) is an urgent but still challenging task. Herein, we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal of As(III), with active chlorine covalently binding spherical polystyrene host for in situ oxidation of As(III) to As(V), and Fe(III) hydroxide (HFO) nanoparticles (NPs) embedded inside for specific As(V) removal. HFO@PS-Cl could work effectively in a wide pH range (5-9), and other substances like sulfate, chloride, bicarbonate, silicate, and humic acid exert insignificant effect on As(III) removal. As(III) sequestration is realized via two pathways, that is, oxidation to As(V) by the active chlorine followed by specific As(V) adsorption onto HFO NPs, and As(III) adsorption onto HFO NPs followed by oxidation to As(V). The exhausted HFO@PS-Cl could be refreshed for cyclic runs with insignificant capacity loss by the combined regeneration strategy, that is, alkaline solution to rinse the adsorbed As(V) and NaClO solution to renew the host oxidation capability. In addition, fixed-bed experiments demonstrated that the HFO@PS-Cl column could generate >1760 bed volume (BV) effluent from a synthetic As(III)-containing groundwater to meet the drinking water standard (nanocomposites, HFO@PS-N and HFO@D201 could only generate 450 and 600 BV effluents under otherwise identical conditions.

Revisión sistemática del schwannoma localizado en el suelo oral. A propósito de un caso

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Carlos A. Espinosa-Fariñas

2016-04-01

Conclusiones: Los schwannomas localizados en el suelo de la boca son infrecuentes. Se presentan en torno a los 40 años, con leve predominancia por el sexo masculino y del lado izquierdo del suelo oral. El tiempo de evolución se encuentra próximo a los 9 meses. Usualmente asintomático. Los nervios hipogloso y lingual se afectan por igual. En proporción similar, el nervio de origen no puede ser identificado. La punción aspiración con aguja fina no es efectiva. El tratamiento de elección consiste en la enucleación del tumor una vez diagnosticado. No se documentaron recidivas.

Fusion Power Demonstration III

International Nuclear Information System (INIS)

Lee, J.D.

1985-07-01

This is the third in the series of reports covering the Fusion Power Demonstration (FPD) design study. This volume considers the FPD-III configuration that incorporates an octopole end plug. As compared with the quadrupole end-plugged designs of FPD-I and FPD-II, this octopole configuration reduces the number of end cell magnets and shortens the minimum ignition length of the central cell. The end-cell plasma length is also reduced, which in turn reduces the size and cost of the end cell magnets and shielding. As a contiuation in the series of documents covering the FPD, this report does not stand alone as a design description of FPD-III. Design details of FPD-III subsystems that do not differ significantly from those of the FPD-II configuration are not duplicated in this report

Epidermal Growth Factor Receptor Variant III (EGFRvIII) Positivity in EGFR-Amplified Glioblastomas: Prognostic Role and Comparison between Primary and Recurrent Tumors.

Science.gov (United States)

Felsberg, Jörg; Hentschel, Bettina; Kaulich, Kerstin; Gramatzki, Dorothee; Zacher, Angela; Malzkorn, Bastian; Kamp, Marcel; Sabel, Michael; Simon, Matthias; Westphal, Manfred; Schackert, Gabriele; Tonn, Jörg C; Pietsch, Torsten; von Deimling, Andreas; Loeffler, Markus; Reifenberger, Guido; Weller, Michael

2017-11-15

Purpose: Approximately 40% of all glioblastomas have amplified the EGFR gene, and about half of these tumors express the EGFRvIII variant. The prognostic role of EGFRvIII in EGFR -amplified glioblastoma patients and changes in EGFRvIII expression in recurrent versus primary glioblastomas remain controversial, but such data are highly relevant for EGFRvIII-targeted therapies. Experimental Design: EGFR -amplified glioblastomas from 106 patients were assessed for EGFRvIII positivity. Changes in EGFR amplification and EGFRvIII status from primary to recurrent glioblastomas were evaluated in 40 patients with EGFR -amplified tumors and 33 patients with EGFR -nonamplified tumors. EGFR single-nucleotide variants (SNV) were assessed in 27 patients. Data were correlated with outcome and validated in 150 glioblastoma patients from The Cancer Genome Atlas (TCGA) consortium. Results: Sixty of 106 EGFR -amplified glioblastomas were EGFRvIII-positive (56.6%). EGFRvIII positivity was not associated with different progression-free or overall survival. EGFRvIII status was unchanged at recurrence in 35 of 40 patients with EGFR -amplified primary tumors (87.5%). Four patients lost and one patient gained EGFRvIII positivity at recurrence. None of 33 EGFR- nonamplified glioblastomas acquired EGFR amplification or EGFRvIII at recurrence. EGFR SNVs were frequent in EGFR -amplified tumors, but were not linked to survival. Conclusions: EGFRvIII and EGFR SNVs are not prognostic in EGFR -amplified glioblastoma patients. EGFR amplification is retained in recurrent glioblastomas. Most EGFRvIII-positive glioblastomas maintain EGFRvIII positivity at recurrence. However, EGFRvIII expression may change in a subset of patients at recurrence, thus repeated biopsy with reassessment of EGFRvIII status is recommended for patients with recurrent glioblastoma to receive EGFRvIII-targeting agents. Clin Cancer Res; 23(22); 6846-55. ©2017 AACR . ©2017 American Association for Cancer Research.

Gd(III)-nanodiamond conjugates for MRI contrast enhancement

Science.gov (United States)

Manus, Lisa M.; Mastarone, Daniel J.; Waters, Emily A.; Zhang, Xue-Qing; Schultz-Sikma, Elise A.; MacRenaris, Keith W.; Ho, Dean

2010-01-01

A Gd(III)-nanodiamond conjugate [Gd(III)-ND] was prepared and characterized, enabling detection of nanodiamonds by MR imaging. The Gd(III)-ND particles significantly reduced the T1 of water protons with a per-Gd(III) relaxivity of 58.82 ± 1.18 mM−1s−1 at 1.5 Tesla (60 MHz). This represents a tenfold increase compared to the monomer Gd(III) complex (r1 = 5.42 ± 0.20 mM−1s−1) and is among the highest per-Gd(III) relaxivities reported. PMID:20038088

Thermodynamic model for solution behavior and solid-liquid equilibrium in Na-Al(III)-Fe(III)-Cr(III)-Cl-H2O system at 25°C

Science.gov (United States)

André, Laurent; Christov, Christomir; Lassin, Arnault; Azaroual, Mohamed

2018-03-01

The knowledge of the thermodynamic behavior of multicomponent aqueous electrolyte systems is of main interest in geo-, and environmental-sciences. The main objective of this study is the development of a high accuracy thermodynamic model for solution behavior, and highly soluble M(III)Cl3(s) (M= Al, Fe, Cr) minerals solubility in Na-Al(III)-Cr(III)-Fe(III)-Cl-H2O system at 25°C. Comprehensive thermodynamic models that accurately predict aluminium, chromium and iron aqueous chemistry and M(III) mineral solubilities as a function of pH, solution composition and concentration are critical for understanding many important geochemical and environmental processes involving these metals (e.g., mineral dissolution/alteration, rock formation, changes in rock permeability and fluid flow, soil formation, mass transport, toxic M(III) remediation). Such a model would also have many industrial applications (e.g., aluminium, chromium and iron production, and their corrosion, solve scaling problems in geothermal energy and oil production). Comparisons of solubility and activity calculations with the experimental data in binary and ternary systems indicate that model predictions are within the uncertainty of the data. Limitations of the model due to data insufficiencies are discussed. The solubility modeling approach, implemented to the Pitzer specific interaction equations is employed. The resulting parameterization was developed for the geochemical Pitzer formalism based PHREEQC database.

Timely management of developing class III malocclusion

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M R Yelampalli

2012-01-01

Full Text Available Timing of orthodontic treatment, especially for children with developing class III malocclusions, has always been somewhat controversial, and definitive treatment tends to be delayed for severe class III cases. Developing class III patients with moderate to severe anterior crossbite and deep bite may need early intervention in some selected cases. Class III malocclusion may develop in children as a result of an inherent growth abnormality, i.e. true class III malocclusion, or as a result of premature occlusal contacts causing forward functional shift of the mandible, which is known as pseudo class III malocclusion. These cases, if not treated at the initial stage of development, interfere with normal growth of the jaw bases and may result in severe facial deformities. The treatment should be carried out as early as possible for permitting normal growth of the skeletal bases. This paper deals with the selection of an appropriate appliance from the various current options available for early intervention in developing class III malocclusion through two case reports.

Bloqueo de los nervios iliohipogástrico e ilioinguinal para analgesia posquirúrgica en cesárea tipo Pfannenstiel realizada bajo anestesia general: ¿qué concentración del anestésico local usar? Iliohypogastric and ilioinguinal block for postsurgical analgesia after pfannenstiel cesarean section performed under general anaesthesia

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Héctor Iván García García

1998-03-01

Full Text Available El bloqueo bilateral de los nervios Iliohipogástrico e Ilioinguinal con bupivacaína al 0.5% puede proveer analgesia luego de cesárea con incisión de Pfannenstiel aunque la cantidad de droga usada está cerca de la dosis máxima segura. Diseñamos este estudio para comparar el efecto analgésico de la bupivacaína al 0.5% y diluida al 0.25%. Se incluyeron treinta pacientes aleatoriamente asignadas a un grupo de estudio (bupivacaína 0.25%, n= 15 y uno de control (bupivacaína 0.5%, n=15. Se evaluaron las pacientes con una Escala Visual Análoga (EVA a las O, 4, 8, 12 y 24 horas posoperatorias por médicos que no sabían a qué grupo pertenecían y sólo en caso de necesidad se prescribió analgesia IM con Diclofenaco. Los puntajes de analgesia y los requerimientos de anal. gesia complementaria fueron notoriamente simila. res en ambos grupos y no hubo diferencias estadísticamente significativas. Concluimos que el bloqueo de estos nervios es una técnica analgésica efectiva (el dolor siempre estuvo en promedio por debajo de 4 en la EVA, que no es afectada por la dilución del anestésico y que además es segura pues no se presentaron complicaciones. The Iliohypogastric and Ilioinguinal bilate. ral block with 0.5% bupivacaine can provide analgesia after Pfannenstiel cesarean section although the required amount of the drug is near the maximum secure dose. We designed this study in order to compare the analgesic effect of 0.5% bupivacaine and diluted 0.25% bupivacaine. Thirty patients were included in the study and asigned in aleatory form to either a study (0.25% bupivacaine n=15 or a control group (0.5% bupivacaine n=15. They were evaluated with the Visual Analogue Scale (VAS at 0,4,8,12,24 postoperative hours by physicians who did not know the group of the patient and prescribed intramuscular analgesia with Dicofenac only if required. The analgesia scores and the complementery analgesia requirements were similar in both groups and there were

Hybrid III-V/silicon lasers

Science.gov (United States)

Kaspar, P.; Jany, C.; Le Liepvre, A.; Accard, A.; Lamponi, M.; Make, D.; Levaufre, G.; Girard, N.; Lelarge, F.; Shen, A.; Charbonnier, P.; Mallecot, F.; Duan, G.-H.; Gentner, J.-.; Fedeli, J.-M.; Olivier, S.; Descos, A.; Ben Bakir, B.; Messaoudene, S.; Bordel, D.; Malhouitre, S.; Kopp, C.; Menezo, S.

2014-05-01

The lack of potent integrated light emitters is one of the bottlenecks that have so far hindered the silicon photonics platform from revolutionizing the communication market. Photonic circuits with integrated light sources have the potential to address a wide range of applications from short-distance data communication to long-haul optical transmission. Notably, the integration of lasers would allow saving large assembly costs and reduce the footprint of optoelectronic products by combining photonic and microelectronic functionalities on a single chip. Since silicon and germanium-based sources are still in their infancy, hybrid approaches using III-V semiconductor materials are currently pursued by several research laboratories in academia as well as in industry. In this paper we review recent developments of hybrid III-V/silicon lasers and discuss the advantages and drawbacks of several integration schemes. The integration approach followed in our laboratory makes use of wafer-bonded III-V material on structured silicon-on-insulator substrates and is based on adiabatic mode transfers between silicon and III-V waveguides. We will highlight some of the most interesting results from devices such as wavelength-tunable lasers and AWG lasers. The good performance demonstrates that an efficient mode transfer can be achieved between III-V and silicon waveguides and encourages further research efforts in this direction.

Use of Fe(III) oxalate for oxidativewastewater treatment; Einsatz von Fe(III)-Oxalat zur chemisch-oxidativen Abwasserbehandlung

Energy Technology Data Exchange (ETDEWEB)

Kim, S.M.; Vogelpohl, A. [Clausthal Univ., Clausthal-Zellerfeld (Germany). Inst. fuer Thermische Verfahrenstechnik

1998-08-01

Iron(III)-oxalate was used as an iron catalyst for the Photo Fenton reaction. Iron(III) oxalations ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) are reduced to Fe(II) by irradiation using near UV-light ({lambda} = 300 - 400 nm) or visible light ({lambda} > 400 nm). At the same time, CO{sub 2}{sup -} or C{sub 2}O{sub 4}{sup -}-radicals originate, which cause the secondary reduction of Fe(III) to Fe(II). By means of the photolytically regenerated Fe(II) ions, hydroxyl radicals are increasingly formed, so that the degradation of organic substances is accelerated. The work aimed to assess the catalytic effect of Fe(III) oxalate for photochemical oxidation processes and to establish the parameters influencing further treatment of leachate from a municipal waste sanitary landfill by means of technical-scale experiments. (orig.) [Deutsch] In der vorliegenden Arbeit wurde Eisen(III)-Oxalat als Eisenkatalysator fuer die Photo-Fenton-Reaktion eingesetzt. Eisen(III)-Oxalationen ([Fe(C{sub 2}O{sub 4}){sub 3}]{sup 3-}) werden durch Strahlung mit nahem UV-Licht ({lambda}=300 bis 400 nm) oder mit sichtbarem Licht ({lambda}>400 nm) zu Fe(II) reduziert. Gleichzeitig entstehen CO{sub 2}{sup .-} oder C{sub 2}O{sub 4}{sup .-}-Radikale, die eine sekundaere Reduktion von Fe(III) zu Fe(II) bewirken. Mit Hilfe der photolytiisch regenerierten Fe(II)-Ionen werden vermehrt Hydroxylradikale gebildet und damit die Abbaugeschwindigkeit der organischen Substanzen beschleunigt. Ziel der hier vorgestellten Arbeit war es, die katalytische Wirkung von Fe(III)-Oxalat fuer photochemische Oxidationsverfahren abzuschaetzen und die Einflussparameter zur weitergehenden Behandlung eines Deponiesickerwassers aus Hausmuelldeponie anhand von Technikumsversuchen zu ermitteln. (orig.)

Synthesis of Er(III)/Yb(III)-doped BiF3 upconversion nanoparticles for use in optical thermometry.

Science.gov (United States)

Du, Peng; Yu, Jae Su

2018-03-23

The authors describe an ethylene glycol assisted precipitation method for synthesis of Er(III)/Yb(III)-doped BiF 3 nanoparticles (NPs) at room temperature. Under 980-nm light irradiation, the NPs emit upconversion (UC) emission of Er(III) ions as a result of a two-photon absorption process. The temperature-dependent green emissions (peaking at 525 and 545 nm) are used to establish an unambiguous relationship between the ratio of fluorescence intensities and temperature. The NPs have a maximum sensitivity of 6.5 × 10 -3  K -1 at 619 K and can be applied over the 291-691 K temperature range. The results indicate that these NPs are a promising candidate for optical thermometry. Graphical abstract Schematic of the room-temperature preparation of Er(III)/Yb(III)-doped BiF 3 nanoparticles with strongly temperature-dependent upconversion emission.

Studies of Binary Complexes of Tripodal Ligand cis,cis-1,3,5-tris(methylaminocyclohexane with Cr(III and Fe(III

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S. Esakki Muthu

2005-01-01

Full Text Available The formation of binary complexes of Cr(III and Fe(III with a tripodal ligand cis,cis-1,3,5-tris(methylaminocyclohexane (tmach (L has been investigated in solution. The overall stability constants of tmach with Cr(III and Fe(III were determined by potentiometric method at an ionic strength of 0.1 M NaClO4 at 25±1°C in aqueous medium. The formation of species like MLH25+, MLH4+, ML3+, ML(OH2+ and ML(OH3 were observed. Fe(III was found to form more stable complexes than Cr(III. Molecular mechanics calculations were performed to explain the mode of coordination in solution.

Mechanisms for Fe(III) oxide reduction in sedimentary environments

Science.gov (United States)

Nevin, Kelly P.; Lovely, Derek R.

2002-01-01

Although it was previously considered that Fe(III)-reducing microorganisms must come into direct contact with Fe(III) oxides in order to reduce them, recent studies have suggested that electron-shuttling compounds and/or Fe(III) chelators, either naturally present or produced by the Fe(III)-reducing microorganisms themselves, may alleviate the need for the Fe(III) reducers to establish direct contact with Fe(III) oxides. Studies with Shewanella alga strain BrY and Fe(III) oxides sequestered within microporous beads demonstrated for the first time that this organism releases a compound(s) that permits electron transfer to Fe(III) oxides which the organism cannot directly contact. Furthermore, as much as 450 w M dissolved Fe(III) was detected in cultures of S. alga growing in Fe(III) oxide medium, suggesting that this organism releases compounds that can solublize Fe(III) from Fe(III) oxide. These results contrast with previous studies, which demonstrated that Geobacter metallireducens does not produce electron-shuttles or Fe(III) chelators. Some freshwater aquatic sediments and groundwaters contained compounds, which could act as electron shuttles by accepting electrons from G. metallireducens and then transferring the electrons to Fe(III). However, other samples lacked significant electron-shuttling capacity. Spectroscopic studies indicated that the electron-shuttling capacity of the waters was not only associated with the presence of humic substances, but water extracts of walnut, oak, and maple leaves contained electron-shuttling compounds did not appear to be humic substances. Porewater from a freshwater aquatic sediment and groundwater from a petroleum-contaminated aquifer contained dissolved Fe(III) (4-16 w M), suggesting that soluble Fe(III) may be available as an electron acceptor in some sedimentary environments. These results demonstrate that in order to accurately model the mechanisms for Fe(III) reduction in sedimentary environments it will be necessary

Nitrile hydration by thiolate- and alkoxide-ligated Co-NHase analogues. Isolation of Co(III)-amidate and Co(III)-iminol intermediates.

Science.gov (United States)

Swartz, Rodney D; Coggins, Michael K; Kaminsky, Werner; Kovacs, Julie A

2011-03-23

Nitrile hydratases (NHases) are thiolate-ligated Fe(III)- or Co(III)-containing enzymes, which convert nitriles to the corresponding amide under mild conditions. Proposed NHase mechanisms involve M(III)-NCR, M(III)-OH, M(III)-iminol, and M(III)-amide intermediates. There have been no reported crystallographically characterized examples of these key intermediates. Spectroscopic and kinetic data support the involvement of a M(III)-NCR intermediate. A H-bonding network facilitates this enzymatic reaction. Herein we describe two biomimetic Co(III)-NHase analogues that hydrate MeCN, and four crystallographically characterized NHase intermediate analogues, [Co(III)(S(Me2)N(4)(tren))(MeCN)](2+) (1), [Co(III)(S(Me2)N(4)(tren))(OH)](+) (3), [Co(III)(S(Me2)N(4)(tren))(NHC(O)CH(3))](+) (2), and [Co(III)(O(Me2)N(4)(tren))(NHC(OH)CH(3))](2+) (5). Iminol-bound 5 represents the first example of a Co(III)-iminol compound in any ligand environment. Kinetic parameters (k(1)(298 K) = 2.98(5) M(-1) s(-1), ΔH(‡) = 12.65(3) kcal/mol, ΔS(‡) = -14(7) e.u.) for nitrile hydration by 1 are reported, and the activation energy E(a) = 13.2 kcal/mol is compared with that (E(a) = 5.5 kcal/mol) of the NHase enzyme. A mechanism involving initial exchange of the bound MeCN for OH- is ruled out by the fact that nitrile exchange from 1 (k(ex)(300 K) = 7.3(1) × 10(-3) s(-1)) is 2 orders of magnitude slower than nitrile hydration, and that hydroxide bound 3 does not promote nitrile hydration. Reactivity of an analogue that incorporates an alkoxide as a mimic of the highly conserved NHase serine residue shows that this moiety facilitates nitrile hydration under milder conditions. Hydrogen-bonding to the alkoxide stabilizes a Co(III)-iminol intermediate. Comparison of the thiolate versus alkoxide intermediate structures shows that C≡N bond activation and C═O bond formation proceed further along the reaction coordinate when a thiolate is incorporated into the coordination sphere.

Effects of ionic strength on the coordination of Eu(III) and Cm(III) to a Gram-negative bacterium, Paracoccus denitrificans

International Nuclear Information System (INIS)

Ozaki, T.; Ohnuki, T.; Kimura, T.; Francis, A.J.

2006-01-01

We studied the effect of ionic strength on the interactions of Europium(III) and Curium(III) with a Gram-negative bacterium Paracoccus denitrificans. Bacterial cells grown in 0.5-, 3.5-, and 5.0% NaCl were used in adsorption experiments and laser experiments that were performed at the same ionic strengths as those in the original growth media. The distribution ratio (log K d ) for Eu(III) and Cm(III) was determined at pHs 3-5. To elucidate the coordination environment of Eu(III) adsorbed on P. denitrificans, we estimated the number of water molecules in the inner sphere and strength of the ligand field by time-resolved laser-induced fluorescence spectroscopy (TRLFS) at pHs 4-6. The log K d of Eu(III) and Cm(III) increased with an increase of pH at all ionic strengths because there was less competition for ligands in cells with H + at higher pHs, wherein less H + was present in solution: cation adsorption generally occurs through an exchange with H + on the functional groups of coordination sites. No significant differences were observed in the log K d of Eu(III) and Cm(III) at each pH in 0.5-, 3.5-, and 5.0% NaCl solutions, though competition for ligands with Na + would be expected to increase at higher NaCl concentrations. The log K d of Eu(III) was almost equivalent to that of Cm(III) under all the experimental conditions. TRLFS showed that the coordination environments of Eu(III) did not differ from each other at 0.5-, 3.5-, and 5.0% NaCl at pHs 4-6. TRLFS also showed that the characteristic of the coordination environment of Eu(III) on P. denitrificans was similar to that on a halophile, Nesterenkonia halobia, while it significantly differed from that on a non-halophile, Pseudomonas putida. These findings indicate that the number of coordination sites for Eu(III) on P. denitrificans, whose cell surface may have similar structures to that of halophiles, increased with increasing ionic strength, though their structure remained unchanged. (orig.)

Comparison of the pain severity, drug leakage and ecchymosis rates caused by the application on tramadol intramuscular injection in Z-track and Air-lock techniques Comparación de la severidad del dolor y las tasas de escape de líquido y equimosis causadas por la aplicación intramuscular de tramadol usando las técnicas de cámara de aire y Z-track Comparação da severidade da dor e as taxas de fuga de líquidas equimoses causadas pela aplicação intramuscular de tramadol usando as técnicas de câmaras de ar e Z-track

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Shahla Najafidolatabad

2010-07-01

Full Text Available Objective. To compare the pain severity caused by the application of the Z-track and Air-lock intramuscular injections. Methodology. Unblinded clinical trial, where 90 female subjects aged between 18 and 60 years old were randomly assigned to two groups; the first group received the tramadol intramuscular injection using the Z-track technique (ZT and the second group received it through the air- lock method (AL. A 10 centimeter linear visual scale was used to evaluate the injection pain. The scale length was considered as the pain severity. Data were analyzed using the SPSS version 13. Groups' age, Body Mass index (BMI, and pain intensity were compared using unpaired student's t test. Results. The study showed that the pain severity of patients in the AL method group was lower than in the ZT technique group (pObjetivo. Comparar la severidad del dolor y las tasas de escape de líquido y equimosis causadas por la aplicación de las inyecciones intramusculares usando la técnica Z-track (ZT y la técnica de la cámara de aire (CA. Metodología. Este es un ensayo clínico no ciego donde un grupo de 90 mujeres entre los 18 y 60 años fueron aleatoriamente asignadas a dos grupos; El primer grupo recibió la inyección por medio de la técnica ZT y el segundo por medio de la técnica de CA. Se uso una escala visual lineal de 10 centímetros para medir la intensidad del dolor causado por la inyección. La longitud de la escala fue considerada como la severidad del dolor. Los datos fueron analizados utilizando el programa SPSS versión 13. La edad, el índice de Masa Corporal (IMC, y la intensidad del dolor de los grupos fueron comparados usando el test de la t para muestras independientes. Resultados. El estudio mostró que la severidad del dolor y las tasas de escape de líquido y equimosis en las pacientes evaluadas usando el método CA era menor que el dolor causado por la técnica ZT (p Objetivo. Comparar a severidade da dor e as taxas de escape de

Specific Reagent for Cr(III): Imaging Cellular Uptake of Cr(III) in Hct116 Cells and Theoretical Rationalization.

Science.gov (United States)

Ali, Firoj; Saha, Sukdeb; Maity, Arunava; Taye, Nandaraj; Si, Mrinal Kanti; Suresh, E; Ganguly, Bishwajit; Chattopadhyay, Samit; Das, Amitava

2015-10-15

A new rhodamine-based reagent (L1), trapped inside the micellar structure of biologically benign Triton-X 100, could be used for specific recognition of Cr(III) in aqueous buffer medium having physiological pH. This visible light excitable reagent on selective binding to Cr(III) resulted in a strong fluorescence turn-on response with a maximum at ∼583 nm and tail of that luminescence band extended until 650 nm, an optical response that is desired for avoiding the cellular autofluorescence. Interference studies confirm that other metal ions do not interfere with the detection process of Cr(III) in aqueous buffer medium having pH 7.2. To examine the nature of binding of Cr(III) to L1, various spectroscopic studies are performed with the model reagent L2, which tend to support Cr(III)-η(2)-olefin π-interactions involving two olefin bonds in molecular probe L1. Computational studies are also performed with another model reagent LM to examine the possibility of such Cr(III)-η(2)-olefin π-interactions. Presumably, polar functional groups of the model reagent LM upon coordination to the Cr(III) center effectively reduce the formal charge on the metal ion and this is further substantiated by results of the theoretical studies. This assembly is found to be cell membrane permeable and shows insignificant toxicity toward live colon cancer cells (Hct116). Confocal laser scanning microscopic studies further revealed that the reagent L1 could be used as an imaging reagent for detection of cellular uptake of Cr(III) in pure aqueous buffer medium by Hct116 cells. Examples of a specific reagent for paramagnetic Cr(III) with luminescence ON response are scanty in the contemporary literature. This ligand design helped us in achieving the turn on response by utilizing the conversion from spirolactam to an acyclic xanthene form on coordination to Cr(III).

Vigilancia de insectos de importancia en salud pública durante la construcción de los proyectos hidroeléctricos Porce II y Porce III, Antioquia, Colombia, 1990-2009

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Walter Alonso Zuluaga

2012-09-01

Full Text Available Introducción. Los estudios entomológicos en las grandes obras de infraestructura hidroeléctricaconstituyen una herramienta para la prevención y el control de enfermedades transmitidas porvectores, debido a que con frecuencia las alteraciones causadas en el medio producen aumento decriaderos naturales y artificiales en el área de influencia y, por ende, incremento de las poblaciones deartrópodos, entre ellos, insectos de interés en salud pública. Objetivo. Realizar estudio y vigilancia de la fauna de Culicidae y Phlebotominae en el área de losproyectos hidroeléctricos Porce II y Porce III, 1990-2009. Materiales y metódos. Se realizaron muestreos entomológicos periódicos para la vigilancia en saludpública de las comunidades ubicadas en el área de influencia y en campamentos y frentes de obra. Los adultos fueron capturados con red para mariposas, trampas de luz Shannon y CDC, y cebo humanoprotegido. Resultados. Se encontraron larvas de mosquitos de Culex coronator, Cx. nigripalpus, Cx. corniger, Cx.quinquefasciatus y Limatus durhami. Los depósitos más frecuentes fueron: tanques bajos, canecas,llantas y matas sembradas en agua. Aedes aegypti solo fue capturado en dos localidades rurales de dosmunicipios del área de influencia. En las zonas de bosque se capturaron mosquitos Aedes, Mansonia,Culex, Psorophora, Wyeomyia, Phonyomyia, Uranotaenia, Haemagogus y Sabethes; el principal fueHaemogogus janthinomis, eficiente vector de fiebre amarilla en Colombia. La zona es endémica paraleishmaniasis y se identificaron 20 especies de Lutzomyia. Entre los vectores de malaria, las principalesespecies encontradas fueron Anopheles nuñeztovari y An. pseudopunctipennis. Conclusión. En la zona de Porce II y Porce III existe diversidad de vectores de importancia en saludpública, que es necesario continuar vigilando para minimizar el riesgo de transmisión de enfermedadesa los trabajadores de las obras y comunidades aledañas.   doi: http

Gender differences in Class III malocclusion.

Science.gov (United States)

Baccetti, Tiziano; Reyes, Brian C; McNamara, James A

2005-07-01

This study evaluated gender differences in the cephalometric records of a large-scale cross-sectional sample of Caucasian subjects with Class III malocclusion at different developmental ages. The purpose also was to provide average age-related and sex-related data for craniofacial measures in untreated Class III subjects that are used as reference in the diagnostic appraisal of the patient with Class III disharmony. The sample examined consisted of 1094 pretreatment lateral cephalometric records (557 female subjects and 537 male subjects) of Caucasian Class III individuals. The age range for female subjects was between three years six months and 57 years seven months. The male subject group ranged from three years three months to 48 years five months. Twelve age groups were identified. Skeletal maturity at different age periods also was determined using the stage of cervical vertebral maturation. Gender differences for all cephalometric variables were analyzed using parametric statistics. The findings of the study indicated that Class III malocclusion is associated with a significant degree of sexual dimorphism in craniofacial parameters, especially from the age of 13 onward. Male subjects with Class III malocclusion present with significantly larger linear dimensions of the maxilla, mandible, and anterior facial heights when compared with female subjects during the circumpubertal and postpubertal periods.

Structural Properties of the Cr(III)-Fe(III) (Oxy)Hydroxide Compositional Series: Insights for a Nanomaterial 'Solid Solution'

International Nuclear Information System (INIS)

Tang, Y.; Zhang, L.; Michel, F.M.; Harrington, R.; Parise, J.B.; Reeder, R.J.

2010-01-01

Chromium(III) (oxy)hydroxide and mixed Cr(III)-Fe(III) (oxy)hydroxides are environmentally important compounds for controlling chromium speciation and bioaccessibility in soils and aquatic systems and are also industrially important as precursors for materials and catalyst synthesis. However, direct characterization of the atomic arrangements of these materials is complicated because of their amorphous X-ray properties. This study involves synthesis of the complete Cr(III)-Fe(III) (oxy)hydroxide compositional series, and the use of complementary thermal, microscopic, spectroscopic, and scattering techniques for the evaluation of their structural properties. Thermal analysis results show that the Cr end member has a higher hydration state than the Fe end member, likely associated with the difference in water exchange rates in the first hydration spheres of Cr(III) and Fe(III). Three stages of weight loss are observed and are likely related to the loss of surface/structural water and hydroxyl groups. As compared to the Cr end member, the intermediate composition sample shows lower dehydration temperatures and a higher exothermic transition temperature. XANES analysis shows Cr(III) and Fe(III) to be the dominant oxidation states. XANES spectra also show progressive changes in the local structure around Cr and Fe atoms over the series. Pair distribution function (PDF) analysis of synchrotron X-ray total scattering data shows that the Fe end member is nanocrystalline ferrihydrite with an intermediate-range order and average coherent domain size of ∼27 (angstrom). The Cr end member, with a coherent domain size of ∼10 (angstrom), has only short-range order. The PDFs show progressive structural changes across the compositional series. High-resolution transmission electron microscopy (HRTEM) results also show the loss of structural order with increasing Cr content. These observations provide strong structural evidence of chemical substitution and progressive structural

{CoIII2DyIII2} single molecule magnet with two resolved thermal activated magnetization relaxation pathways at zero field.

Science.gov (United States)

Funes, Alejandro V; Carrella, Luca; Rentschler, Eva; Alborés, Pablo

2014-02-14

The new complex [Co(III)2Dy(III)2(OMe)2(teaH)2(Piv)6] in the {Co(III)2Dy(III)2} family, shows two well resolved thermal activated magnetization relaxation pathways under AC experiments in zero DC field. Fitted crystal field parameters suggest that the origin of these two pathways relies on two different excited mJ sub-levels.

Outcome of tyrosinaemia type III.

Science.gov (United States)

Ellaway, C J; Holme, E; Standing, S; Preece, M A; Green, A; Ploechl, E; Ugarte, M; Trefz, F K; Leonard, J V

2001-12-01

Tyrosinaemia type III is a rare disorder caused by a deficiency of 4-hydroxyphenylpyruvate dioxygenase, the second enzyme in the catabolic pathway of tyrosine. The majority of the nine previously reported patients have presented with neurological symptoms after the neonatal period, while others detected by neonatal screening have been asymptomatic. All have had normal liver and renal function and none has skin or eye abnormalities. A further four patients with tyrosinaemia type III are described. It is not clear whether a strict low tyrosine diet alters the natural history of tyrosinaemia type III, although there remains a suspicion that treatment may be important, at least in infancy.

Adsorption behavior of Am(III) on granite

International Nuclear Information System (INIS)

Zhang Yingjie; Feng Xiaogui; Liang Junfu; Chen Jing; Su Rui; Wang Ju; Liu Chunli

2009-01-01

The adsorption behavior of Am(III) on granite (sampled from drilling well BS01 at Beishan (BS) area--a potential candidate site for China's high-level radioactive waste repository, the granite sample's depth about 300 m) was studied in BS03 well groundwater by a batch technique at (25±1) degree C. The influences of pH, sulphate ion, total carbonate ion, humic acid, and concentration of the Am(III) on the adsorption behavior were also studied, and the possible adsorption mechanism was discussed. Experimental results show that the adsorption distribution rate of Am(III) on granite increases with increasing pH of aqueous phase. The chemical composition of the groundwater is the main factor which influences the species of Am(III) and adsorption behavior. The adsorption mechanism of Am(III) on granite is surface complexation. The adsorption isotherm of Am(III) on granite can be described by Freundlich's equation. (authors)

Interação das lesões causadas pela sarna-da-macieira (Venturia inaequalis na capacidade de infestação dos frutos por lagartas de Grapholita molesta (Lepidoptera: Tortricidae

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Oscar Arnaldo Batista Neto e Silva

2011-12-01

Full Text Available Em monitoramentos de pragas realizados na cultura da macieira foram observadas maiores infestações da mariposa oriental (Grapholita molesta em frutos provenientes de pomares com maior incidência de lesões causadas pela sarna-da-macieira (Venturia inaequalis. Para validar esta observação, conduziu-se um experimento em laboratório com o objetivo de verificar a influência de lesões da sarna da macieira em frutos, na capacidade de infestação por G. molesta. Foram utilizados frutos (n=200 de macieira da variedade Gala com sintomas da sarna (n=100 e frutos sadios (n=100. Uma lagarta recém-eclodida foi inoculada em cada fruto e a avaliação foi realizada 10 dias após a infestação, determinando-se o número de lagartas que conseguiram penetrar nos frutos. Houve diferença significativa na capacidade de penetração das lagartas associado a presença de lesões da sarna (87% quando comparado com frutos sadios (61%. Conclui-se que frutos de maçã da cv. Gala atacados por Venturia inaequalis são mais infestados por lagartas de primeiro ínstar de Grapholita molesta.

Bloqueio bilateral do nervo pudendo para hemorroidectomia em paciente acondroplásico: relato de caso Bloqueo bilateral del nervio pudendo para hemorroidectomía en paciente acondroplásico: relato de caso Bilateral blockade of the pudend nerve to hemorrhoidectomy in achondroplasic patient: case report

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Bruno Salomé de Morais

2006-04-01

ética espontánea. La anestesia de esos pacientes presenta varias particularidades. El objetivo del presente relato fue el de describir un caso de paciente acondroplásico, con previo historial de intervención quirúrgica de la columna para descompresión medular, sometido a Hemorroidectomía a través de bloqueo bilateral de los nervios pudendos. RELATO DEL CASO: Paciente del sexo masculino, 47 años, acondroplásico, que fue ingresado para la realización de hemorroidectomía.Al hacérsele el examen físico presentaba el cuello acortado con extensión limitada de la cabeza, Mallampati clase IV, distancia tireomentoniana de 6 cm y abertura de la boca de 3,5 cm. La columna vertebral presentaba cifosis torácica y lordosis lumbar acentuada, además de cicatriz quirúrgica en la región lumbar. Fue realizado el bloqueo bilateral de los nervios pudendos con ropivacaina a 1%, por vía transperineal, con una aguja aislada de 0,8 mm x 100 mm 21G (Stimuplex A100 BBraun, Melsungen, Germany conectada al estimulador de nervios periféricos (Stimuplex-DIG, BBraun.El paciente fue colocado en decúbito ventral y la cirugía iniciada después de 15 minutos da administración del anestésico. Durante todo el procedimiento, el paciente permaneció consciente y no relató ningún dolor o incomodidad. Hasta el momento del alta hospitalaria (22h después de la realización del bloqueo, el paciente no refirió dolor, incomodidad, náusea, vómito, bloqueo motor, retención o incontinencia urinaria. Después del alta, evolucionó bien presentando evacuación después de 31 horas de efectuada la cirugía. CONCLUSIONES: El caso mostró el uso del bloqueo bilateral de los nervios pudendos, con el auxilio del neuroestimulador como técnica anestésica aislada para la hemorroidectomía.BACKGROUND AND OBJECTIVES: The achondroplasic dwarfism or achondroplasia is the most common form of dwarfism and occurs, in most of the cases, as a result of spontaneous genetic alteration. The anesthesia in these

Determination of stability constants of iron(III and chromium(III-nitrilotriacetate-methyl cysteine mixed complexes by electrophoretic technique

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Brij Bhushan Tewari

2004-06-01

Full Text Available The stability constants of Fe(III and Cr(III with methyl cysteine and nitrilotriacetate (NTA were determined by paper electrophoretic technique. Beside binary ternary complexes have also been studied, in which nitrilotriacetate and methyl cysteine acts as primary and secondary ligand, respectively. The stability constants of mixed ligand complexes metal (M-nitrilotriacetate-methyl cysteine have been found to be 5.72 plus or minus 0.09 and 5.54 plus or minus 0.11 (log K values for Fe(III and Cr(III complexes, respectively, at 35 oC and ionic strength 0.1 M.

Modelling Eu(III) speciation in a Eu(III)/PAHA/α-Al2O3 ternary system

International Nuclear Information System (INIS)

Janot, Noemie; Reiller, Pascal E.; Benedetti, Marc F.

2013-01-01

In this work, modelling of Eu(III) speciation in a ternary system, i.e., in presence of purified Aldrich humic acid (PAHA) and α-Al 2 O 3 , is presented. First, the mineral surface charge is measured by potentiometric titrations and then described using the CD-MUSIC model. This model is also used to describe Eu(III) binding to the α-Al 2 O 3 surface at different pH values, ionic strength and mineral concentrations. Time resolved luminescence spectroscopy (TRLS) is then used to study the binding of Eu(III) to PAHA at pH 4 with different humic acid concentrations. The spectra are used to calculate a spectroscopic 'titration curve', used to determine Eu(III)/PAHA binding parameters in the NICA-Donnan model. Following a previous study (Janot et al., Water Res. 46, 731-740), modelling of the ternary system is based upon the definition of two PAHA pools where one fraction remains in solution and the other is adsorbed onto the mineral surface, with each possessing different proton and metal binding parameters. The modification of protonation behaviour for both fractions is examined using spectrophotometric titrations of the non adsorbed PAHA fraction at different organic/mineral ratios. These data are then used to describe Eu(III) interactions in the ternary system: Eu(III) re-partitioning in the ternary system is calculated for different pH, ionic strength and PAHA concentrations, and results are compared to experimental observations. The model is in good agreement with experimental data, except at high PAHA fractionation rates. Results show that organic complexation dominates over a large pH range, with the predominant species existing as the surface-bound fraction. Above pH 8, Eu(III) seems to be mostly complexed to the mineral surface, which is in agreement with previous spectroscopic observations (Janot et al., Environ. Sci. Technol. 45, 3224-3230). (authors)

Spectroscopic and thermodynamic study of the complexation of Cm(III) and Eu(III) with hydrophilic bis-triazinyl pyridines

International Nuclear Information System (INIS)

Ruff, Christian

2013-01-01

In the present work the complexation of Cm(III) and Eu(III) with a hydrophilic 2,6-bis-(1,2,4-triazinyl)-pyridine (aq-BTP) is studied. Aq-BTP complexes actinides(III) selectively over lanthanides(III) in nitric acid solution. The object of this work is the identification and the spectroscopic and thermodynamic characterization of the Cm(III) and Eu(III) complex species present in solution. The results should contribute to a better fundamental understanding of the driving force behind BTPs selectivity towards trivalent actinides on a molecular level. Time-resolved laser fluorescence spectroscopy (TRLFS), luminescence and UV/Vis spectroscopy are applied. Information on the structure of M(III)-aq-BTP complex species is obtained from density functional theory. Three different M(III) complex species containing one, two or three aq-BTP ligands are identified in H 2 O at pH 3.0. Relative fluorescence intensity factors are determined for each of the [M(aq-BTP) n ] complexes (M = Cm(III)/Eu(III), n = 1 - 3). These factors are required to quantify the complexes. The stability constant logβ 3 of the [Cm(aq-BTP) 3 ] complex (which is the one relevant to extraction processes) is two orders of magnitude higher than that of the corresponding Eu(III) complex. This difference is in agreement with the separation factor (SF Am(III)/Eu(III) = 150) determined experimentally by liquid-liquid extraction. The difference in the stability constants originates from the different reaction enthalpies for the formation of the [M(aq-BTP) 3 ] complexes. These results represent the thermodynamic driving force for the aq-BTPs selectivity towards trivalent actinides over lanthanides. Comparing the stability constants of the [M(aq-BTP) n ] species (M = Cm(III)/Eu(III), n = 1 - 3) shows an increasing selectivity with increasing number of coordinated aq-BTP ligands. Hence, high selectivity is achieved if the f-element ions are fully coordinated by nine N-donor atoms (three aq-BTP ligands). A less

Sb(III)-Imprinted Organic-Inorganic Hybrid Sorbent Prepared by Hydrothermal-Assisted Surface Imprinting Technique for Selective Adsorption of Sb(III)

Science.gov (United States)

Zhang, Dan; Zhao, Yue; Xu, Hong-Bo

2018-03-01

Sb(III)-imprinted organic-inorganic hybrid sorbent was prepared by hydrothermal-assisted surface imprinting technique and was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy coupled to an energy dispersive spectrometer and N2 adsorption/desorption isotherms. Hydrothermal-assisted process can improve the selectivity of the Sb(III)-imprinted hybrid sorbent for Sb(III) due to stable control of temperature and pressure. The Sb(III)-imprinted hybrid sorbent IIS indicated higher selectivity for Sb(III), had high static adsorption capacity of 37.3 mg g-1 for Sb(III), displayed stable adsorption capacity in pH range from 4 to 8, reached an rapid adsorption equilibrium within 30 min. According to the correlation coefficient ( r 2 > 0.99), the experimental data fitted better the pseudo-second-order kinetic model and Langmuir equilibrium isotherm.

Adsorption Behaviour of La(III and Eu(III Ions from Aqueous Solutions by Hydroxyapatite: Kinetic, Isotherm, and Thermodynamic Studies

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F. Granados-Correa

2013-01-01

Full Text Available The hydroxyapatite was successfully synthesized, characterized, and used as an alternative low-cost adsorbent material to study the adsorption behavior of La(III and Eu(III ions from nitrate aqueous solutions as a function of contact time, initial metal ion concentration, pH, and temperature by using a bath technique. The kinetic data correspond very well to the pseudo-second-order equation, and in both cases the uptake was affected by intraparticle diffusion. Isotherm adsorption data were well fitted by the Freundlich model equation with 1/n>1, indicating a multilayer and cooperative-type adsorption. Thermodynamic parameters for the adsorption systems were determinated at 293, 303, 313, and 323 K. These parameters show that adsorptions of La(III and Eu(III ions on hydroxyapatite are endothermic and spontaneous processes. The adsorption was found to follow the order Eu(III > La(III and is dependent on ion concentration, pH, and temperature.

Electrochemical reduction of Eu (III) in propionic media

International Nuclear Information System (INIS)

Brotto, M.E.; Rabockai, T.

1988-01-01

Some chronopotentiometric studies of Eu (III) electro-reducion in propionic media that suggests the presence of two parallel rections: Eu (III) → Eu (II) and Eu (III) → Eu (II) → Y are presented. Some experimental data, such Eu (III) reducion, electrolysis of solutions and ionic power of the system are discussed. (M.J.C.) [pt

Culture-bound syndromes in Hispanic primary care patients.

Science.gov (United States)

Bayles, Bryan P; Katerndahl, David A

2009-01-01

We sought to document Hispanic primary care patients' knowledge and experience of five culture-bound syndromes (CBS), as well as the basic socio-cultural correlates of these disorders. A convenience sample of 100 adult Hispanic patients presenting in an urban South Texas primary care clinic was recruited to complete a brief cross-sectional survey, presented in an oral format. Interviews sought information concerning five culture-bound syndromes--susto, empacho, nervios, mal de ojo, and ataques de nervios. Additional demographic, socio-economic, and acculturation data was collected. Descriptive and bivariate statistics (chi square, Fisher's) were used to assess relationships among variables and experience with each CBS. A multivariate logistic analysis was conducted to determine the possible contributions of age, gender, acculturation, and education to the personal experience of a culture-bound syndrome. Results indicate that 77% of respondents had knowledge of all five syndromes, with 42% reporting having personally experienced at least one CBS. Nervios was the most commonly suffered disorder, being reported by 30 respondents. This was followed, in declining order ofprevalence, by susto, mal de ojo, empacho, and ataques de nervios. Multivariate logistic regression analysis found that higher education beyond high school was associated with a slightly decreased likelihood of reporting having suffered from any culture-bound syndrome. While co-occurrence among these disorders occurred, the patterns of predictors suggest that the co-occurrence is not a reflection of mislabeling of one common syndrome. Knowledge of and experience with culture-bound syndromes is common among Hispanic primary care patients in South Texas. Healthcare providers ought to consider discussing these illnesses in a non-judgmental manner with patients who present with symptoms that are consistent with these syndromes. Future studies, with larger sample sizes, are warranted to elucidate the nature

III-V semiconductor materials and devices

CERN Document Server

Malik, R J

1989-01-01

The main emphasis of this volume is on III-V semiconductor epitaxial and bulk crystal growth techniques. Chapters are also included on material characterization and ion implantation. In order to put these growth techniques into perspective a thorough review of the physics and technology of III-V devices is presented. This is the first book of its kind to discuss the theory of the various crystal growth techniques in relation to their advantages and limitations for use in III-V semiconductor devices.

Separation studies of La(III) and Ce(III)/Nd(III)/Pr(III)/Sm(III) from chloride solution using DEHPA/PC88A in petrofin

International Nuclear Information System (INIS)

Acharya, Sagarika; Mishra, Sujata; Bhatta, B.C.

2017-01-01

The separation of La(III) and four other lanthanides. Ce, Nd, Pr and Sm from chloride solution has been studied using the two acidic organophosphorous extractants, DEHPA and PC88A in petrofin at pH 4.3. The metal content analysis was done using an ICP-OES spectrophotometer. The separation factors (β) was calculated and for La-Sm pair highest value of 9.7 was obtained. (author)

Environmentally-relevant concentrations of Al(III) and Fe(III) cations induce aggregation of free DNA by complexation with phosphate group.

Science.gov (United States)

Qin, Chao; Kang, Fuxing; Zhang, Wei; Shou, Weijun; Hu, Xiaojie; Gao, Yanzheng

2017-10-15

Environmental persistence of free DNA is influenced by its complexation with other chemical species and its aggregation mechanisms. However, it is not well-known how naturally-abundant metal ions, e.g., Al(III) and Fe(III), influence DNA aggregation. This study investigated aggregation behaviors of model DNA from salmon testes as influenced by metal cations, and elucidated the predominant mechanism responsible for DNA aggregation. Compared to monovalent (K + and Na + ) and divalent (Ca 2+ and Mg 2+ ) cations, Al(III) and Fe(III) species in aqueous solution caused rapid DNA aggregations. The maximal DNA aggregation occurred at 0.05 mmol/L Al(III) or 0.075 mmol/L Fe(III), respectively. A combination of atomic force microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy revealed that Al(III) and Fe(III) complexed with negatively charged phosphate groups to neutralize DNA charges, resulting in decreased electrostatic repulsion and subsequent DNA aggregation. Zeta potential measurements and molecular computation further support this mechanism. Furthermore, DNA aggregation was enhanced at higher temperature and near neutral pH. Therefore, DNA aggregation is collectively determined by many environmental factors such as ion species, temperature, and solution pH. Copyright © 2017 Elsevier Ltd. All rights reserved.

Extraction behaviour of Am(III) and Eu(III) from nitric acid medium in CMPO-HDEHP impregnated resins

Energy Technology Data Exchange (ETDEWEB)

Saipriya, K.; Kumar, T. [Bhabha Atomic Research Centre Facilities (India). Kalpakkam Reproscessing Plants; Kumaresan, R.; Nayak, P.K.; Venkatesan, K.A.; Antony, M.P. [Indira Gandhi Center for Atomic Research, Kalpakkam (India). Fuel Chemistry Div.

2016-05-01

Chromatographic resin containing extractants such as octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) or bis-(2-ethylhexyl)phosphoric acid (HDEHP) or mixture of extractants (CMPO + HDEHP) in an acrylic polymer matrix was prepared and studied for the extraction of Am(III) and Eu(III) over a range of nitric acid concentration. The effect of various parameters such as concentration of nitric acid in aqueous phase and the concentration of CMPO and HDEHP in the resin phase was studied. The distribution coefficient of Am(III) and Eu(III) in the impregnated resin increased with increased in the concentration of nitric acid for CMPO-impregnated resin, whereas a reverse trend was observed in HDEHP impregnated resin. In case of resin containing both the extractants, synergism was observed at low nitric acid concentration and antagonism at high nitric acid concentration. The mechanism of extraction was probed by slope analysis method at 0.01 and 2 M nitric acid concentrations. Citrate-buffered DTPA was used for the selective separation of Am(III), and a separation factor of 3-4 was obtained at pH 3.

Connective tissue-activating peptide III (CTAP-III): cloning the synthetic gene and characterization of the protein expressed in E. coli

International Nuclear Information System (INIS)

Johnson, P.H.; Castor, C.W.; Walz, D.A.

1986-01-01

CTAP-III, an α-granule protein secreted by human platelets, is known to stimulate mitogenesis, extracellular matrix synthesis, and plasminogen activator synthesis in human fibroblast cultures. From its primary sequence, a synthetic gene was constructed to code for a methionine-free derivative (Leu substituted for Met-21), then cloned and expressed in E. coli using a new expression vector containing regulatory elements of the colicin E1 operon. Partially purified recombinant CTAP-III showed a line of identity with CTAP-III by immunodiffusion against rabbit antibody to platelet-derived CTAP-III. Immunodetection of the reduced protein after SDS-PAGE electrophoresis showed a molecular weight (mobility) in agreement with the natural form. Biologic activity of rCTAP-III eluted from an antiCTAP-III immunoaffinity column was measured in human synovial cell bioassay systems. rCTAP-III stimulated synovial cell synthesis of 14 C-hyaluronic acid approximately 13-fold; significant (P < 0.001) mitogenesis was also observed. These studies indicate that a sufficient quantity of bioactive peptide can be obtained for a more comprehensive study of its biologic properties

Study of extraction kinetics of lanthanides(III) and actinides(III) nitrates by the molecule N, N'-dimethyl-N, N'-dibutyl, tetradecylmalonamide

International Nuclear Information System (INIS)

Daldon, M.

1999-01-01

The kinetics of extraction of lanthanides (III) and actinides (III) nitrates by the molecule N, N'-dimethyl - N, N'-dibutyl tetra-decyl malonamide has been investigated. This study was realised with a new constant interfacial-area-stirred cell. During the qualification step of the device it appears that the reduction of the device can lead to hydrolytic perturbations. The main conclusions are: - after the determination of conditions which provide kinetics regime (diffusion of species neglectable), partial orders of the kinetics law have been obtained and lead to the establishment of the law J = k [Nd 3+ ] [NO 3 - ] 3 [diamide] 1 , - interfacial tension measurements and kinetics study in presence of surface-active compounds proved that the chemical limiting reaction for Nd(III) is interfacial, - the results allow to propose an adsorption-desorption reaction mechanism, - a comprehensive study of the extraction kinetics of the lanthanides(III) series and also Am(III) and Cm(III) nitrates has been realised. The lighter lanthanides (La, Ce and Pr) exhibit higher kinetics rate of extraction than the others, which differs from the tendency observed with distribution coefficients which exhibit tetrad effect. The kinetics rate of extraction of Am(III) and Cm(III) is closed to the value of Eu(III). (author)

Nitrile Hydration by Thiolate–and Alkoxide–Ligated Co-NHase Analogues. Isolation of Co(III)-Amidate and Co(III)–Iminol Intermediates

Science.gov (United States)

Swartz, Rodney D.; Coggins, Michael K.; Kaminsky, Werner; Kovacs, Julie A.

2011-01-01

Nitrile hydratases (NHases) are thiolate–ligated Fe(III)- or Co(III)-containing enzymes, which convert nitriles to the corresponding amide under mild conditions. Proposed NHase mechanisms involve M(III)–NCR, M(III)–OH, M(III)–iminol and M(III)–amide intermediates. Spectroscopic and kinetic data support the involvement of a M(III)–NCR intermediate. A H–bonding network facilitates this enzymatic reaction. There have been no reported crystallographically characterized examples of these key intermediates. Herein we describe two biomimetic Co(III)–NHase analogues that hydrate MeCN. Four key crystallographically characterized NHase intermediate anaologues, [CoIII(SMe2N4(tren))(MeCN)]2+ (1), [CoIII(SMe2N4(tren))(OH)]+ (3), [CoIII(SMe2N4(tren))(NHC(O)CH3)]+ (2), and [CoIII(OMe2N4(tren))(NHC(OH)CH3)]2+ (5) are described. Iminol–bound 5 represents the first example of a Co(III)-iminol compound in any ligand environment. Kinetic parameters (k1(298 K)= 2.98(5) M−1s−1, ΔH‡ = 12.65(3) kcal/mol, ΔS‡ = −14(7) e.u.) for nitrile hydration by 1 are reported, and the activation energy Ea= 13.2 kcal/mol is compared with that (Ea= 5.5 kcal/mol) of the NHase enzyme. A mechanism involving initial exchange of the bound MeCN for OH− is ruled out by the fact that nitrile exchange from 1 (kex(300 K)= 7.3(1) x10−3 s−1) is two orders of magnitude slower than nitrile hydration, and that hydroxide bound 3 does not promote nitrile hydration. Reactivity of an analogue that incorporates an alkoxide as a mimic of the highly conserved NHase serine residue shows that this moiety facilitates nitrile hydration under milder conditions. Hydrogen-bonding to the alkoxide stabilizes a Co(III)-iminol intermediate. Comparison of the thiolate versus alkoxide intermediate structures shows that C≡N bond activation and C=O bond formation proceed further along the reaction coordinate when a thiolate is incorporated into the coordination sphere. PMID:21351789

Dissimilatory Fe(III) and Mn(IV) reduction.

Science.gov (United States)

Lovley, D R

1991-06-01

The oxidation of organic matter coupled to the reduction of Fe(III) or Mn(IV) is one of the most important biogeochemical reactions in aquatic sediments, soils, and groundwater. This process, which may have been the first globally significant mechanism for the oxidation of organic matter to carbon dioxide, plays an important role in the oxidation of natural and contaminant organic compounds in a variety of environments and contributes to other phenomena of widespread significance such as the release of metals and nutrients into water supplies, the magnetization of sediments, and the corrosion of metal. Until recently, much of the Fe(III) and Mn(IV) reduction in sedimentary environments was considered to be the result of nonenzymatic processes. However, microorganisms which can effectively couple the oxidation of organic compounds to the reduction of Fe(III) or Mn(IV) have recently been discovered. With Fe(III) or Mn(IV) as the sole electron acceptor, these organisms can completely oxidize fatty acids, hydrogen, or a variety of monoaromatic compounds. This metabolism provides energy to support growth. Sugars and amino acids can be completely oxidized by the cooperative activity of fermentative microorganisms and hydrogen- and fatty-acid-oxidizing Fe(III) and Mn(IV) reducers. This provides a microbial mechanism for the oxidation of the complex assemblage of sedimentary organic matter in Fe(III)- or Mn(IV)-reducing environments. The available evidence indicates that this enzymatic reduction of Fe(III) or Mn(IV) accounts for most of the oxidation of organic matter coupled to reduction of Fe(III) and Mn(IV) in sedimentary environments. Little is known about the diversity and ecology of the microorganisms responsible for Fe(III) and Mn(IV) reduction, and only preliminary studies have been conducted on the physiology and biochemistry of this process.

25 CFR 502.4 - Class III gaming.

Science.gov (United States)

2010-04-01

... 25 Indians 2 2010-04-01 2010-04-01 false Class III gaming. 502.4 Section 502.4 Indians NATIONAL INDIAN GAMING COMMISSION, DEPARTMENT OF THE INTERIOR GENERAL PROVISIONS DEFINITIONS OF THIS CHAPTER § 502.4 Class III gaming. Class III gaming means all forms of gaming that are not class I gaming or class...

Analysis of gold(I/III)-complexes by HPLC-ICP-MS demonstrates gold(III) stability in surface waters.

Science.gov (United States)

Ta, Christine; Reith, Frank; Brugger, Joël; Pring, Allan; Lenehan, Claire E

2014-05-20

Understanding the form in which gold is transported in surface- and groundwaters underpins our understanding of gold dispersion and (bio)geochemical cycling. Yet, to date, there are no direct techniques capable of identifying the oxidation state and complexation of gold in natural waters. We present a reversed phase ion-pairing HPLC-ICP-MS method for the separation and determination of aqueous gold(III)-chloro-hydroxyl, gold(III)-bromo-hydroxyl, gold(I)-thiosulfate, and gold(I)-cyanide complexes. Detection limits for the gold species range from 0.05 to 0.30 μg L(-1). The [Au(CN)2](-) gold cyanide complex was detected in five of six waters from tailings and adjacent monitoring bores of working gold mines. Contrary to thermodynamic predictions, evidence was obtained for the existence of Au(III)-complexes in circumneutral, hypersaline waters of a natural lake overlying a gold deposit in Western Australia. This first direct evidence for the existence and stability of Au(III)-complexes in natural surface waters suggests that Au(III)-complexes may be important for the transport and biogeochemical cycling of gold in surface environments. Overall, these results show that near-μg L(-1) enrichments of Au in environmental waters result from metastable ligands (e.g., CN(-)) as well as kinetically controlled redox processes leading to the stability of highly soluble Au(III)-complexes.

Impact of Fe(III)-OM complexes and Fe(III) polymerization on SOM pools reactivity under different land uses

Science.gov (United States)

Giannetta, B.; Plaza, C.; Zaccone, C.; Siebecker, M. G.; Rovira, P.; Vischetti, C.; Sparks, D. L.

2017-12-01

Soil organic matter (SOM) protection and long-term accumulation are controlled by adsorption to mineral surfaces in different ways, depending on its molecular structure and pedo-climatic conditions. Iron (Fe) oxides are known to be key regulators of the soil carbon (C) cycle, and Fe speciation in soils is highly dependent on environmental conditions and chemical interactions with SOM. However, the molecular structure and hydrolysis of Fe species formed in association with SOM is still poorly described. We hypothesize the existence of two pools of Fe which interact with SOM: mononuclear Fe(III)-SOM complexes and precipitated Fe(III) hydroxides. To verify our hypothesis, we investigated the interactions between Fe(III) and physically isolated soil fractions by means of batch experiments at pH 7. Specifically, we examined the fine silt plus clay (FSi+C) fraction, obtained by ultrasonic dispersion and wet sieving. The soil samples spanned several land uses, including coniferous forest (CFS), grassland (GS), technosols (TS) and agricultural (AS) soils. Solid phase products and supernatants were analyzed for C and Fe content. X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) analysis were also performed. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was used to assess the main C functional groups involved in C complexation and desorption experiments. Preliminary linear combination fitting (LCF) of Fe K-edge extended X-ray absorption fine structure (EXAFS) spectra suggested the formation of ferrihydrite-like polymeric Fe(III) oxides in reacted CFS and GS samples, with higher C and Fe concentration. Conversely, mononuclear Fe(III) OM complexes dominated the speciation for TS and AS samples, characterized by lower C and Fe concentration, inhibiting the hydrolysis and polymerization of Fe (III). This approach will help revealing the mechanisms by which SOM pools can control Fe(III) speciation, and will elucidate how both Fe(III

Teachers' Guide to Music Appreciation III A and III B in the Senior High School.

Science.gov (United States)

Scott, J. Mark; Dawkins, Barbara R.

This guide to music appreciation courses was developed for use in senior high schools in Duval County, Jacksonville, Florida. Music Appreciation III A examines the development of music, from the Gothic period through the Classical period. Music Appreciation III B examines the development of music from the Romantic period through the 1970s.…

Electrochemical behavior of ruthenium (III), rhodium (III) and palladium (II) in 1-butyl-3-methylimidazolium chloride ionic liquid

Energy Technology Data Exchange (ETDEWEB)

Jayakumar, M.; Venkatesan, K.A. [Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India); Srinivasan, T.G. [Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)], E-mail: tgs@igcar.gov.in; Vasudeva Rao, P.R. [Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)

2009-11-01

Electrochemical behavior of ruthenium (III), rhodium (III) and palladium (II) in 1-butyl-3-methylimidazolium chloride (bmimCl) and their ternary and binary solutions in bmimCl was studied at various working electrodes at 373 K by cyclic voltammetry and chronoamperometry. Ruthenium (III) chloride forms a stable solution with bmimCl and the cyclic voltammogram of ruthenium (III) in bmimCl recorded at glassy carbon electrode consisted of several redox waves due to the complex nature of ruthenium to exist in several oxidation states. Electrolysis of ruthenium (III) chloride in bmimCl at the cathodic limit of bmimCl (-1.8 V (vs. Pd)) did not result in ruthenium metal deposition. However, it was deposited from bmimPF{sub 6} and bmimNTf{sub 2} room temperature ionic liquids at -0.8 V (vs. Pd). The electrochemical behavior of ruthenium (III) in bmimCl in the presence of palladium (II) and rhodium (III) was studied by cyclic voltammetry. The presence of palladium (II) in bmimCl favors underpotential deposition of ruthenium metal. The nuclear loop at -0.5 V (vs. Pd) was observed in all solutions when palladium (II) co-existed with other two metal ions. Nucleation and growth of the metal on glassy carbon working electrode was investigated by chronoamperometry. The growth and decay of chronocurrents has been found to follow the instantaneous nucleation model with three-dimensional growth of nuclei.

Study of type III ELMs in JET

NARCIS (Netherlands)

Sartori, R.; Saibene, G.; Horton, L. D.; Becoulet, M.; Budny, R.; Borba, D.; Chankin, A.; Conway, G. D.; Cordey, G.; McDonald, D.; Guenther, K.; von Hellermann, M. G.; Igithkanov, Y.; Loarte, A.; Lomas, P. J.; Pogutse, O.; Rapp, J.

2004-01-01

This paper presents the results of JET experiments aimed at studying the operational space of plasmas with a Type III ELMy edge, in terms of both local and global plasma parameters. In JET, the Type III ELMy regime has a wide operational space in the pedestal n(e)-T-e diagram, and Type III ELMs are

Development of an EGFRvIII specific recombinant antibody

Directory of Open Access Journals (Sweden)

Li Gordon

2010-10-01

Full Text Available Abstract Background EGF receptor variant III (EGFRvIII is the most common variant of the EGF receptor observed in human tumors. It results from the in frame deletion of exons 2-7 and the generation of a novel glycine residue at the junction of exons 1 and 8. This novel juxtaposition of amino acids within the extra-cellular domain of the EGF receptor creates a tumor specific and immunogenic epitope. EGFRvIII expression has been seen in many tumor types including glioblastoma multiforme (GBM, breast adenocarcinoma, non-small cell lung carcinoma, ovarian adenocarcinoma and prostate cancer, but has been rarely observed in normal tissue. Because this variant is tumor specific and highly immunogenic, it can be used for both a diagnostic marker as well as a target for immunotherapy. Unfortunately many of the monoclonal and polyclonal antibodies directed against EGFRvIII have cross reactivity to wild type EGFR or other non-specific proteins. Furthermore, a monoclonal antibody to EGFRvIII is not readily available to the scientific community. Results In this study, we have developed a recombinant antibody that is specific for EGFRvIII, has little cross reactivity for the wild type receptor, and which can be easily produced. We initially designed a recombinant antibody with two anti-EGFRvIII single chain Fv's linked together and a human IgG1 Fc component. To enhance the specificity of this antibody for EGFRvIII, we mutated tyrosine H59 of the CDRH2 domain and tyrosine H105 of the CDRH3 domain to phenylalanine for both the anti-EGFRvIII sequence inserts. This mutated recombinant antibody, called RAbDMvIII, specifically detects EGFRvIII expression in EGFRvIII expressing cell lines as well as in EGFRvIII expressing GBM primary tissue by western blot, immunohistochemistry (IHC and immunofluorescence (IF and FACS analysis. It does not recognize wild type EGFR in any of these assays. The affinity of this antibody for EGFRvIII peptide is 1.7 × 107 M-1 as

Celestine III and the North

DEFF Research Database (Denmark)

Nielsen, Torben Kjersgaard

2008-01-01

Artiklen gennemgår pave Cølestin IIIs forhold til de nordiske kongeriger i perioden 1191-1198. Artiklen viser, at paven, som i forskningen traditionelt år har stået i skyggen af sin berømte, energiske og især: yngre efterfølger, Innocens III, har været på forkant med udviklingen i de nordiske rig...

Selective extraction of americium(III) over europium(III) ions with pyridylpyrazole ligands. Structure-property relationships

Energy Technology Data Exchange (ETDEWEB)

Su, Dongping; Liu, Ying; Li, Shimeng; Ding, Songdong; Jin, Yongdong; Wang, Zhipeng; Hu, Xiaoyang; Zhang, Lirong [Department of chemistry, Sichuan University, Chengdu (China)

2017-01-18

To clarify the structure-property relationships of pyridylpyrazole ligands and provide guidance for the design of new and more efficient ligands for the selective extraction of actinides over lanthanides, a series of alkyl-substituted pyridylpyrazole ligands with different branched chains at different positions of the pyrazole ring were synthesized. Extraction experiments showed that the pyridylpyrazole ligands exhibited good selective extraction abilities for Am{sup III} ions, and the steric effects of the branched chain had a significant impact on the distribution ratios of Am{sup III} and Eu{sup III} ions as well as the separation factor. Moreover, both slope analyses and UV/Vis spectrometry titrations indicated the formation of a 1:1 complex of 2-(1-octyl-1H-pyrazol-3-yl)pyridine (C8-PypzH) with Eu{sup III} ions. The stability constant (log K) for this complex obtained from the UV/Vis titration was 4.45 ± 0.04. Single crystals of the complexes of 3-(2-pyridyl)pyrazole (PypzH) with Eu(NO{sub 3}){sub 3} and Sm(NO{sub 3}){sub 3} were obtained; PypzH acts as a bidentate ligand in the crystal structures, and the N atom with a bound H atom did not participate in the coordination. In general, this study revealed some interesting findings on the effects of the alkyl-chain structure and the special complexation between pyridylpyrazole ligands and Ln{sup III} ions. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

Study of Type III ELMs in JET

Energy Technology Data Exchange (ETDEWEB)

Sartori, R [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Saibene, G [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Horton, L D [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Becoulet, M [Association Euratom-CEA, CE Cadarache, F-13108 St Paul-lez-Durance, CEDEX (France); Budny, R [PPPL, Princeton University, PO Box 451, Princeton, NJ 08543 (United States); Borba, D [Associacao EURATOM/IST, Centro de Fusao Nuclear, 1096 Lisbon, CODEX (Portugal); Chankin, A [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Conway, G D [Association Euratom-IPP, MPI fuer Plasmaphysik, 2 Boltzmannstrasse, Garching (Germany); Cordey, G [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); McDonald, D [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Guenther, K [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Hellermann, M G von [FOM-Rijnhuizen, Ass. Euratom-FOM, TEC, PO Box 1207, 3430 BE Nieuwegein (Netherlands); Igithkanov, Yu [Max-Planck-Institute for Plasma Physics, Teilinstitut Greifswald, EURATOM Ass., D-17491, Greifswald (Germany); Loarte, A [EFDA Close Support Unit, Garching, 2 Boltzmannstrasse, Garching (Germany); Lomas, P J [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Pogutse, O [EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Rapp, J [EFDA Close Support Unit, Culham, Abingdon OX14 3DB (United Kingdom)

2004-05-01

This paper presents the results of JET experiments aimed at studying the operational space of plasmas with a Type III ELMy edge, in terms of both local and global plasma parameters. In JET, the Type III ELMy regime has a wide operational space in the pedestal n{sub e} - T{sub e} diagram, and Type III ELMs are observed in standard ELMy H-modes as well as in plasmas with an internal transport barrier (ITB). The transition from an H-mode with Type III ELMs to a steady state Type I ELMy H-mode requires a minimum loss power, P{sub TypeI}. P{sub TypeI} decreases with increasing plasma triangularity. In the pedestal n{sub e} - T{sub e} diagram, the critical pedestal temperature for the transition to Type I ELMs is found to be inversely proportional to the pedestal density (T{sub crit} {proportional_to} 1/n) at a low density. In contrast, at a high density, T{sub crit}, does not depend strongly on density. In the density range where T{sub crit} {proportional_to} 1/n, the critical power required for the transition to Type I ELMs decreases with increasing density. Experimental results are presented suggesting a common mechanism for Type III ELMs at low and high collisionality. A single model for the critical temperature for the transition from Type III to Type I ELMs, based on the resistive interchange instability with magnetic flutter, fits well the density and toroidal field dependence of the JET experimental data. On the other hand, this model fails to describe the variation of the Type III n{sub e} - T{sub e} operational space with isotopic mass and q{sub 95}. Other results are instead suggestive of a different physics for Type III ELMs. At low collisionality, plasma current ramp experiments indicate a role of the edge current in determining the transition from Type III to Type I ELMs, while at high collisionality, a model based on resistive ballooning instability well reproduces, in term of a critical density, the experimentally observed q{sub 95} dependence of the

Zwitterion-functionalized polymer microspheres as a sorbent for solid phase extraction of trace levels of V(V), Cr(III), As(III), Sn(IV), Sb(III) and Hg(II) prior to their determination by ICP-MS.

Science.gov (United States)

Jia, Xiaoyu; Gong, Dirong; Zhao, Junyi; Ren, Hongyun; Wang, Jiani; Zhang, Xian

2018-03-19

This paper describes the preparation of zwitterion-functionalized polymer microspheres (ZPMs) and their application to simultaneous enrichment of V(V), Cr(III), As(III), Sn(IV), Sb(III) and Hg(II) from environmental water samples. The ZPMs were prepared by emulsion copolymerization of ethyl methacrylate, 2-diethylaminoethyl methacrylate and triethylene glycol dimethyl acrylate followed by modification with 1,3-propanesultone. The components were analyzed by elemental analyses as well as Fourier transform infrared spectroscopy, and the structures were characterized by scanning electron microscopy and transmission electron microscopy. The ZPMs were packed into a mini-column for on-line solid-phase extraction (SPE) of the above metal ions. Following extraction with 40 mM NH 4 NO 3 and 0.5 M HNO 3 solution, the ions were quantified by ICP-MS. Under the optimized conditions, the enrichment factors (from a 40 mL sample) are up to 60 for the ions V(V), As(III), Sb(III) and Hg(II), and 55 for Cr(III) and Sn(IV). The detection limits are 1.2, 3.4, 1.0, 3.7, 2.1 and 1.6 ng L -1 for V(V), Cr(III), As(III), Sn(IV), Sb(III) and Hg(II), respectively, and the relative standard deviations (RSDs) are below 5.2%. The feasibility and accuracy of the method were validated by successfully analyzing six certified reference materials as well as lake, well and river waters. Graphical abstract Zwitterion-functionalized polymer microspheres (ZPMs) were prepared and packed into a mini-column for on-line solid-phase extraction (SPE) via pump 1. Then V(V), Cr(III), As(III), Sn(IV), Sb(III) and Hg(II) ions in environmental waters were eluted and submitted to ICP-MS via pump 2.

Separation of 248Cm (III) from 252Cf (III) and its use in time resolved fluorescence spectroscopic (TRFS) studies

International Nuclear Information System (INIS)

Murali, M.S.; Nair, A.G.C.; Gujar, R.B.; Jain, A.; Tomar, B.S.; Godbole, S.V.; Reddy, A.V.R.; Manchanda, V.K.

2008-07-01

The present report gives a description of the methodology for the separation of 248 Cm(III) from decayed 252 Cf (III) waste solution. The waste solution was first assayed for 252 Cf content by neutron counting using a neutron well coincidence counter. The sample was subjected to the chemical separation of 248 Cm (III) from 252 Cf (III) following anion and cation exchange chromatography. The alpha spectrum of the separated curium fraction showed peaks due to 246 Cm and 248 Cm while the corresponding alpha spectrum of californium fraction showed 249,250,251,252 Cf. The gamma ray abundances of 249 Cf were determined with respect to its gamma rays of 387 keV and the data agreed well with that in literature. Separated Cm(III) was further characterized by recording its time resolved fluorescence spectrum (TRFS) in aqueous medium. (author)

Thermodynamic model for solution behavior and solid-liquid equilibrium in Na-Al(III-Fe(III-Cr(III-Cl-H2O system at 25°C

Directory of Open Access Journals (Sweden)

André Laurent

2018-03-01

Full Text Available The knowledge of the thermodynamic behavior of multicomponent aqueous electrolyte systems is of main interest in geo-, and environmental-sciences. The main objective of this study is the development of a high accuracy thermodynamic model for solution behavior, and highly soluble M(IIICl3(s (M= Al, Fe, Cr minerals solubility in Na-Al(III-Cr(III-Fe(III-Cl-H2O system at 25°C. Comprehensive thermodynamic models that accurately predict aluminium, chromium and iron aqueous chemistry and M(III mineral solubilities as a function of pH, solution composition and concentration are critical for understanding many important geochemical and environmental processes involving these metals (e.g., mineral dissolution/alteration, rock formation, changes in rock permeability and fluid flow, soil formation, mass transport, toxic M(III remediation. Such a model would also have many industrial applications (e.g., aluminium, chromium and iron production, and their corrosion, solve scaling problems in geothermal energy and oil production. Comparisons of solubility and activity calculations with the experimental data in binary and ternary systems indicate that model predictions are within the uncertainty of the data. Limitations of the model due to data insufficiencies are discussed. The solubility modeling approach, implemented to the Pitzer specific interaction equations is employed. The resulting parameterization was developed for the geochemical Pitzer formalism based PHREEQC database.

Radiation protection in category III large gamma irradiators; Radioprotecao em irradiadores de grande porte de categoria III

Energy Technology Data Exchange (ETDEWEB)

Costa, Neivaldo; Furlan, Gilberto Ribeiro, E-mail: neivaldo@cena.usp.b, E-mail: gilfurlan@cena.usp.b [Centro de Energia Nuclear na Agricultura (CENA/USP), Piracicaba, SP (Brazil); Itepan, Natanael Marcio, E-mail: natanael.itepan@unianhanguera.edu.b [Universidade Anhanguera, Goiania, GO (Brazil)

2011-07-01

This article discusses the advantages of category III large gamma irradiator compared to the others, with emphasis on aspects of radiological protection, in the industrial sector. This category is a kind of irradiators almost unknown to the regulators authorities and the industrial community, despite its simple construction and greater radiation safety intrinsic to the model, able to maintain an efficiency of productivity comparable to those of category IV. Worldwide, there are installed more than 200 category IV irradiators and there is none of a category III irradiator in operation. In a category III gamma irradiator, the source remains fixed in the bottom of the tank, always shielded by water, negating the exposition risk. Taking into account the benefits in relation to radiation safety, the category III large irradiators are highly recommended for industrial, commercial purposes or scientific research. (author)

Kinetic determination of As(III in solution

Directory of Open Access Journals (Sweden)

TODOR G. PECEV

2003-10-01

Full Text Available A new reaction is suggested and a new kinetic method is elaborated for the As(III traces determination in solution, on the basis of their catalyzing effect on komplexon III (EDTA oxidation by KMnO4 in a strong acid solution (H2SO4. Using a spectrophotometric technique, a sensitivity of 72 ng/cm3 As(III was achieved. The relative error of method varies from 5.5 to 13.9 % for As(III concentration range from 83 to 140 ng/cm3. Appropriate kinetic equations are formulated and the influence of some other ions, including the As(V, upon the reaction rate is tested.

Strong and anisotropic superexchange in the single-molecule magnet (SMM) [MnIII(6)OsIII]3+: promoting SMM behavior through 3d-5d transition metal substitution.

Science.gov (United States)

Hoeke, Veronika; Stammler, Anja; Bögge, Hartmut; Schnack, Jürgen; Glaser, Thorsten

2014-01-06

The reaction of the in situ generated trinuclear triplesalen complex [(talent-Bu2)MnIII3(solv)n]3+ with (Ph4P)3[OsIII(CN)6] and NaClO4·H2O affords [MnIII6OsIII](ClO4)3 (= [{(talent-Bu2)MnIII3}2{OsIII(CN)6}](ClO4)3) in the presence of the oxidizing agent [(tacn)2NiIII](ClO4)3 (tacn =1,4,7-triazacyclononane), while the reaction of [(talent-Bu2)MnIII3(solv)n]3+ with K4[OsII(CN)6] and NaClO4·H2O yields [MnIII6OsII](ClO4)2 under an argon atmosphere. The molecular structure of [MnIII6OsIII]3+ as determined by single-crystal X-ray diffraction is closely related to the already published [MnIII6Mc]3+ complexes (Mc = CrIII, FeIII, CoIII, MnIII). The half-wave potential of the OsIII/OsII couple is E1/2 = 0.07 V vs Fc+/Fc. The FT-IR and electronic absorption spectra of [MnIII6OsII]2+ and [MnIII6OsIII]3+ exhibit distinct features of dicationic and tricationic [MnIII6Mc]n+ complexes, respectively. The dc magnetic data (μeff vs T, M vs B, and VTVH) of [MnIII6OsII]2+ are successfully simulated by a full-matrix diagonalization of a spin-Hamiltonian including isotropic exchange, zero-field splitting with full consideration of the relative orientation of the D-tensors, and Zeeman interaction, indicating antiferromagnetic MnIII–MnIII interactions within the trinuclear triplesalen subunits (JMn–Mn(1) = −(0.53 ± 0.01) cm–1, Ĥex = −2∑iSMM [MnIII6OsIII]3+ compared to the 3d analogue [MnIII6FeIII]3+ due to the stronger and anisotropic Mc–MnIII exchange interaction.

One of the possible mechanisms for the inhibition effect of Tb(III) on peroxidase activity in horseradish (Armoracia rusticana) treated with Tb(III).

Science.gov (United States)

Guo, Shaofen; Cao, Rui; Lu, Aihua; Zhou, Qing; Lu, Tianhong; Ding, Xiaolan; Li, Chaojun; Huang, Xiaohua

2008-05-01

One of the possible mechanisms for the inhibition effect of Tb(III) on peroxidase activity in horseradish (Armoracia rusticana) treated with Tb(III) was investigated using some biophysical and biochemical methods. Firstly, it was found that a large amount of Tb(III) can be distributed on the cell wall, that some Tb(III) can enter into the horseradish cell, indicating that peroxidase was mainly distributed on cell wall, and thus that Tb(III) would interact with horseradish peroxidase (HRP) in the plant. In addition, peroxidase bioactivity was decreased in the presence of Tb(III). Secondly, a new peroxidase-containing Tb(III) complex (Tb-HRP) was obtained from horseradish after treatment with Tb(III); the molecular mass of Tb-HRP is near 44 kDa and the pI is about 8.80. Thirdly, the electrocatalytic activity of Tb-HRP is much lower than that of HRP obtained from horseradish without treatment with Tb(III). The decrease in the activity of Tb-HRP is due to the destruction (unfolding) of the conformation in Tb-HRP. The planarity of the heme active center in the Tb-HRP molecule was increased and the extent of exposure of Fe(III) in heme was decreased, leading to inhibition of the electron transfer. The microstructure change in Tb-HRP might be the result of the inhibition effect of Tb(III) on peroxidase activity in horseradish.

National Coastal Condition Report III Factsheet

Science.gov (United States)

The National Coastal Condition Report III (NCCR III) is the third in a series of environmental assessments of U.S. coastal waters and the Great Lakes. The report includes assessments of the nation’s estuaries in the contiguous 48 states and Puerto Rico.

National Coastal Condition Report III (2008)

Science.gov (United States)

The National Coastal Condition Report III (NCCR III) is the third in a series of environmental assessments of U.S. coastal waters and the Great Lakes. The report includes assessments of the nation’s estuaries in the contiguous 48 states and Puerto Rico.

Anodic Stripping Voltammetric Detection of Arsenic(III) at Platinum-Iron(III) Nanoparticle Modified Carbon Nanotube on Glassy Carbon Electrode

International Nuclear Information System (INIS)

Shin, Seung Hyun; Hong, Hun Gi

2010-01-01

The electrochemical detection of As(III) was investigated on a platinum-iron(III) nanoparticles modified multiwalled carbon nanotube on glassy carbon electrode(nanoPt-Fe(III)/MWCNT/GCE) in 0.1 M H 2 SO 4 . The nanoPt-Fe(III)/ MWCNT/GCE was prepared via continuous potential cycling in the range from .0.8 to 0.7 V (vs. Ag/AgCl), in 0.1 M KCl solution containing 0.9 mM K 2 PtCl 6 and 0.6 mM FeCl 3 . The Pt nanoparticles and iron oxide were co-electrodeposited into the MWCNT-Nafion composite film on GCE. The resulting electrode was examined by cyclic voltammetry (CV), scanning electron microscopy (SEM), and anodic stripping voltammetry (ASV). For the detection of As(III), the nanoPt-Fe(III)/MWCNT/GCE showed low detection limit of 10 nM (0.75 ppb) and high sensitivity of 4.76 μAμM -1 , while the World Health Organization's guideline value of arsenic for drinking water is 10 ppb. It is worth to note that the electrode presents no interference from copper ion, which is the most serious interfering species in arsenic detection

New analogues of Cucurbita maxima trypsin inhibitor III (CMTI III) with simplified structure.

Science.gov (United States)

Rolka, K; Kupryszewski, G; Rózycki, J; Ragnarsson, U; Zbyryt, T; Otlewski, J

1992-10-01

Seven new analogues of trypsin inhibitor CMTI III were obtained by solid-phase peptide synthesis. Three analogues contained only two, instead of three, disulfide bridges, whereas the molecules of the next four analogues were shortened at the N- and/or C-terminus. The elimination of one disulfide bridge in CMTI III induces a decrease in the association equilibrium constants by 6-7 orders of magnitude, whereas the removal of one, two or three amino-acid residues at the N- and/or C-terminus does not significantly affect the activity.

Antisites in III-V semiconductors: Density functional theory calculations

KAUST Repository

Chroneos, A.

2014-07-14

Density functional based simulation, corrected for finite size effects, is used to investigate systematically the formation of antisite defects in III-V semiconductors (III=Al, Ga, and In and V=P, As, and Sb). Different charge states are modelled as a function of the Fermi level and under different growth conditions. The formation energies of group III antisites (III V q) decrease with increasing covalent radius of the group V atom though not group III radius, whereas group V antisites (V I I I q) show a consistent decrease in formation energies with increase in group III and group V covalent radii. In general, III V q defects dominate under III-rich conditions and V I I I q under V-rich conditions. Comparison with equivalent vacancy formation energy simulations shows that while antisite concentrations are always dominant under stoichiometric conditions, modest variation in growth or doping conditions can lead to a significantly higher concentration of vacancies. © 2014 AIP Publishing LLC.

Organometallic neptunium(III) complexes

Science.gov (United States)

Dutkiewicz, Michał S.; Farnaby, Joy H.; Apostolidis, Christos; Colineau, Eric; Walter, Olaf; Magnani, Nicola; Gardiner, Michael G.; Love, Jason B.; Kaltsoyannis, Nikolas; Caciuffo, Roberto; Arnold, Polly L.

2016-08-01

Studies of transuranic organometallic complexes provide a particularly valuable insight into covalent contributions to the metal-ligand bonding, in which the subtle differences between the transuranium actinide ions and their lighter lanthanide counterparts are of fundamental importance for the effective remediation of nuclear waste. Unlike the organometallic chemistry of uranium, which has focused strongly on UIII and has seen some spectacular advances, that of the transuranics is significantly technically more challenging and has remained dormant. In the case of neptunium, it is limited mainly to NpIV. Here we report the synthesis of three new NpIII organometallic compounds and the characterization of their molecular and electronic structures. These studies suggest that NpIII complexes could act as single-molecule magnets, and that the lower oxidation state of NpII is chemically accessible. In comparison with lanthanide analogues, significant d- and f-electron contributions to key NpIII orbitals are observed, which shows that fundamental neptunium organometallic chemistry can provide new insights into the behaviour of f-elements.

Biomimetic oxidation of piperine and piplartine catalyzed by iron(III) and manganese(III) porphyrins.

Science.gov (United States)

Schaab, Estela Hanauer; Crotti, Antonio Eduardo Miller; Iamamoto, Yassuko; Kato, Massuo Jorge; Lotufo, Letícia Veras Costa; Lopes, Norberto Peporine

2010-01-01

Synthetic metalloporphyrins, in the presence of monooxygen donors, are known to mimetize various reactions of cytochrome P450 enzymes systems in the oxidation of drugs and natural products. The oxidation of piperine and piplartine by iodosylbenzene using iron(III) and manganese(III) porphyrins yielded mono- and dihydroxylated products, respectively. Piplartine showed to be a more reactive substrate towards the catalysts tested. The structures of the oxidation products were proposed based on electrospray ionization tandem mass spectrometry.

Distribution and Translocation of 141Ce (III) in Horseradish

Science.gov (United States)

Guo, Xiaoshan; Zhou, Qing; Lu, Tianhong; Fang, Min; Huang, Xiaohua

2007-01-01

Background and Aims Rare earth elements (REEs) are used in agriculture and a large amount of them contaminate the environment and enter foods. The distribution and translocation of 141Ce (III) in horseradish was investigated in order to help understand the biochemical behaviour and toxic mechanism of REEs in plants. Method The distribution and translocation of 141Ce (III) in horseradish were investigated using autoradiography, liquid scintillation counting (LSC) and electron microscopic autoradiography (EMARG) techniques. The contents of 141Ce (III) and nutrient elements were analysed using an inductively coupled plasma-atomic emission spectrometer (ICP-AES). Results The results from autoradiography and LSC indicated that 141Ce (III) could be absorbed by horseradish and transferred from the leaf to the leaf-stalk and then to the root. The content of 141Ce (III) in different parts of horseradish was as follows: root > leaf-stalk > leaf. The uptake rates of 141Ce (III) in horseradish changed with the different organs and time. The content of 141Ce (III) in developing leaves was greater than that in mature leaves. The results from EMARG indicated that 141Ce (III) could penetrate through the cell membrane and enter the mesophyll cells, being present in both extra- and intra-cellular deposits. The contents of macronutrients in horseradish were decreased by 141Ce (III) treatment. Conclusions 141Ce (III) can be absorbed and transferred between organs of horseradish with time, and the distribution was found to be different at different growth stages. 141Ce (III) can enter the mesophyll cells via apoplast and symplast channels or via plasmodesmata. 141Ce (III) can disturb the metabolism of macronutrients in horseradish. PMID:17921527

Gen-III/III+ reactors. Solving the future energy supply shortfall. The SWR-1000 option

International Nuclear Information System (INIS)

Stosic, Z.V.

2006-01-01

Deficiency of non-renewable energy sources, growing demand for electricity and primary energy, increase in population, raised concentration of greenhouse gases in the atmosphere and global warming are the facts which make nuclear energy currently the most realistic option to replace fossil fuels and satisfy global demand. The nuclear power industry has been developing and improving reactor technology for almost five decades and is now ready for the next generation of reactors which should solve the future energy supply shortfall. The advanced Gen-III/III+ (Generation III and/or III+) reactor designs incorporate passive or inherent safety features which require no active controls or operational intervention to manage accidents in the event of system malfunction. The passive safety equipment functions according to basic laws of physics such as gravity and natural convection and is automatically initiated. By combining these passive systems with proven active safety systems, the advanced reactors can be considered to be amongst the safest equipment ever made. Since the beginning of the 90's AREVA NP has been intensively engaged in the design of two advanced Gen-III+ reactors: (i) PWR (Pressurized Water Reactor) EPR (Evolutionary Power Reactor) and (ii) BWR (Boiling Water Reactor) SWR-1000. The SWR-1000 reactor design marks a new era in the successful tradition of BWR technology. It meets the highest safety standards, including control of a core melt accident. This is achieved by supplementing active safety systems with passive safety equipment of diverse design for accident detection and control and by simplifying systems needed for normal plant operation. A short construction period, flexible fuel cycle lengths and a high fuel discharge burn-up contribute towards meeting economic goals. The SWR-1000 completely fulfils international nuclear regulatory requirements. (author)

Spectroscopic investigations on the complexation of Cm(III) and Eu(III) with organic model ligands and their binding mode in human urine (in vitro)

International Nuclear Information System (INIS)

Heller, Anne

2011-01-01

In case of incorporation, trivalent actinides (An(III)) and lanthanides (Ln(III)) pose a serious health risk to humans. An(III) are artificial, highly radioactive elements which are mainly produced during the nuclear fuel cycle in nuclear power plants. Via hazardous accidents or nonprofessional storage of radioactive waste, they can be released in the environment and enter the human food chain. In contrast, Ln(III) are nonradioactive, naturally occurring elements with multiple applications in technique and medicine. Consequently it is possible that humans get in contact and incorporate both, An(III) and Ln(III). Therefore, it is of particular importance to elucidate the behaviour of these elements in the human body. While macroscopic processes such as distribution, accumulation and excretion are studied quite well, knowledge about the chemical binding form (speciation) of An(III) and Ln(III) in various body fluids is still sparse. In the present work, for the first time, the speciation of Cm(III) and Eu(III) in natural human urine (in vitro) has been investigated spectroscopically and the formed complex identified. For this purpose, also basic investigations on the complex formation of Cm(III) and Eu(III) in synthetic model urine as well as with the urinary relevant, organic model ligands urea, alanine, phenylalanine, threonine and citrate have been performed and the previously unknown complex stability constants determined. Finally, all experimental results were compared to literature data and predictions calculated by thermodynamic modelling. Since both, Cm(III) and Eu(III), exhibit unique luminescence properties, particularly the suitability of time-resolved laser-induced fluorescence spectroscopy (TRLFS) could be demonstrated as a method to investigate these metal ions in untreated, complex biofluids. The results of this work provide new scientific findings on the biochemical reactions of An(III) and Ln(III) in human body fluids on a molecular scale and

Indicadores de riesgo de morbilidad prevenible causada por medicamentos Risk indicators of preventable morbidity related to drug utilization

Directory of Open Access Journals (Sweden)

Ana Dago Martínez

2007-02-01

Full Text Available Objetivos: Seleccionar y estudiar la aceptabilidad, en términos de relevancia y pertinencia, de ciertas situaciones clínicas que puedan usarse como indicadores de riesgo de morbilidad prevenible causada por medicamentos y que sean utilizables en las farmacias comunitarias. Método: Método Delphi, en 2 rondas, con un panel de 14 expertos médicos y farmacéuticos que valoraron la relevancia y pertinencia de 68 tipos de situaciones clínicas como indicadores de morbilidad potencial relacionada con medicamentos, detectable por el profesional en su medio, con evidencia científica de resultado adverso previsible, frecuentes en el medio ambulatorio y con causa y resultado controlables. Resultados: Se consideraron utilizables y pertinentes 43 de los 68 indicadores estudiados, que se referían a 3 ámbitos: tipo de medicamento (medicamentos de estrecho margen terapéutico, con dosis individualizada y con reacciones adversas frecuentes y graves, problema de salud (problemas crónicos, especialmente asma, enfermedad cardíaca, tiroidea, prostática y dolor y tipo de paciente (ancianos y/o polimedicados. Los farmacéuticos sobrevaloraron sistemáticamente ciertos indicadores en relación con los médicos, aunque las diferencias no fueron significativas. Conclusiones: Se identificaron 43 indicadores de morbilidad potencial relacionada con los medicamentos e identificables por los profesionales en su entorno.Objective: To select clinical situations that can be used as risk indicators of preventable morbidity caused by drugs at the community pharmacies, and to study their acceptability, in terms of pertinence and relevance. Methods: We used the Delphi technique, in 2 rounds, by a panel of 14 medical doctors and pharmacists experts, to study the relevance of 68 types of clinical situations as risk indicators of preventable morbidity related to drug utilization used by health professionals in community pharmacies, with scientific evidence of foreseeable

IIIST1\\NTI-i\\III.

African Journals Online (AJOL)

guests in September 1914. (1) Major-General Sir Lothian Nicholson. KCB, CMG, and Major H 1. MacMullen, MC, History of the East Lancashire Regiment in the Great. War 1914-1918, Littlebury. Bros, Ltd. Liverpool,. 1936. p 114. Ti\\.~TI(~S-1\\ IIIST ••III. ~SI Til VI~V. I..•f :01 i\\. f~•• 10III.SOIl ~IIII~ 1~lt. The study of military tactics ...

Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS)

Science.gov (United States)

Gasbarre, Joseph; Walker, Richard; Cisewski, Michael; Zawodny, Joseph; Cheek, Dianne; Thornton, Brooke

2015-01-01

The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) mission will extend the SAGE data record from the ideal vantage point of the International Space Station (ISS). The ISS orbital inclination is ideal for SAGE measurements providing coverage between 70 deg north and 70 deg south latitude. The SAGE data record includes an extensively validated data set including aerosol optical depth data dating to the Stratospheric Aerosol Measurement (SAM) experiments in 1975 and 1978 and stratospheric ozone profile data dating to the Stratospheric Aerosol and Gas Experiment (SAGE) in 1979. These and subsequent data records, notably from the SAGE II experiment launched on the Earth Radiation Budget Satellite in 1984 and the SAGE III experiment launched on the Russian Meteor-3M satellite in 2001, have supported a robust, long-term assessment of key atmospheric constituents. These scientific measurements provide the basis for the analysis of five of the nine critical constituents (aerosols, ozone (O3), nitrogen dioxide (NO2), water vapor (H2O), and air density using O2) identified in the U.S. National Plan for Stratospheric Monitoring. SAGE III on ISS was originally scheduled to fly on the ISS in the same timeframe as the Meteor-3M mission, but was postponed due to delays in ISS construction. The project was re-established in 2009.

Aspectos epidemiológicos de pacientes com lesões ungueais e cutâneas causadas por Scytalidium spp Epidemiological aspects of patients with ungual and cutaneous lesions caused by Scytalidium spp

Directory of Open Access Journals (Sweden)

Ana Paula Martins Xavier

2010-12-01

Full Text Available FUNDAMENTO: As dermatomicoses causadas por fungos filamentosos não dermatófitos são infecções raras, exceto as onicomicoses, cuja prevalência vem crescendo nos últimos anos. Dentre esses agentes etiológicos destacam-se o Scytalidium dimidiatum e o S. hyalinum, fungos emergentes responsáveis por micoses em unhas e pele. OBJETIVO: Investigar as características epidemiológicas das onicomicoses e micoses de outras localizações causadas pelos fungos do gênero Scytalidium, utilizando-se como parâmetros sexo, idade e localizações das lesões. MÉTODOS: Avaliaram-se 81 amostras com cultura positiva para o gênero em estudo, oriundas de 74 pacientes encaminhados ao Laboratório de Investigação em Dermatologia (ID situado na cidade do Rio de Janeiro (RJ, no período de 1997 a 2006. As amostras foram submetidas a confirmação diagnóstica por exame direto e cultura. RESULTADOS: A prevalência de onicomicoses por Scytalidium spp. foi de 0,87%, entre as idades de 41 e 60 anos (48,64%. Em relação à localização das lesões, os pés foram mais acometidos (91,36%, com predomínio do hálux esquerdo. No exame direto, as estruturas mais encontradas foram hifas hialinas; na cultura, a espécie S. dimidiatum foi a mais frequente. CONCLUSÃO: As onicomicoses por Scytalidium spp. são raras e o S. dimidiatum foi a espécie mais isolada neste laboratório no período em estudo.BACKGROUND: Dermatomycoses caused by non-dermatophyte filamentous fungi are rare infections, except for onychomycosis, whose prevalence has increased over the past few years. Among these etiologic agents, we highlight Scytalidium dimidiatum and S. hyalinum, emergent fungi that cause mycoses that affect the nails and skin. OBJECTIVE: To investigate the characteristics of onychomycosis and other mycoses caused by the fungi Scytalidium spp, using sex, age and site of infection as parameters. METHODS: Eighty-one samples were evaluated showing positive culture for Scytalidium

40 CFR 300.220 - Related Title III issues.

Science.gov (United States)

2010-07-01

... 40 Protection of Environment 27 2010-07-01 2010-07-01 false Related Title III issues. 300.220 Section 300.220 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) SUPERFUND, EMERGENCY... PLAN Planning and Preparedness § 300.220 Related Title III issues. Other related Title III requirements...

Determination of dissociation constants for coordination compounds of Cr(III) and Co(III) using potentiometric and spectrophotometric methods

International Nuclear Information System (INIS)

Chylewska, A.; Jacewicz, D.; Zarzeczanska, D.; Chmurzynski, L.

2008-01-01

The acid-base properties of analogous complex ions of chromium(III) and cobalt(III) in aqueous solution have been studied. The equilibrium constants for all metal complexes were determined by using potentiometric and spectrophotometric titration methods. First, dissociation constants for the studied complexes of Cr(III) and Co(III) were determined by means of the potentiometric titration method and using the STOICHIO computer programme. Then, pH-spectrophotometric titrations were performed and the OriginPro 7.5 computer programme was used to calculate the same constants. The measurements using both methods were carried out under the same conditions of temperature, T = 298.15 K, and over the same pH range 2.00-10.00, respectively. It turned out that the two methods used enabled us to obtain acidity constants in very good agreement

Determination of dissociation constants for coordination compounds of Cr(III) and Co(III) using potentiometric and spectrophotometric methods

Energy Technology Data Exchange (ETDEWEB)

Chylewska, A.; Jacewicz, D.; Zarzeczanska, D. [Department of Chemistry, University of Gdansk, Sobieskiego 18/19, 80-952 Gdansk (Poland); Chmurzynski, L. [Department of Chemistry, University of Gdansk, Sobieskiego 18/19, 80-952 Gdansk (Poland)], E-mail: lech@chem.univ.gda.pl

2008-08-15

The acid-base properties of analogous complex ions of chromium(III) and cobalt(III) in aqueous solution have been studied. The equilibrium constants for all metal complexes were determined by using potentiometric and spectrophotometric titration methods. First, dissociation constants for the studied complexes of Cr(III) and Co(III) were determined by means of the potentiometric titration method and using the STOICHIO computer programme. Then, pH-spectrophotometric titrations were performed and the OriginPro 7.5 computer programme was used to calculate the same constants. The measurements using both methods were carried out under the same conditions of temperature, T = 298.15 K, and over the same pH range 2.00-10.00, respectively. It turned out that the two methods used enabled us to obtain acidity constants in very good agreement.

Study of extraction kinetics of lanthanides(III) and actinides(III) nitrates by the molecule N, N'-dimethyl-N, N'-dibutyl, tetradecylmalonamide; Etude des cinetiques d'extraction des nitrates de lanthanides (III) et d'actinides (III) par le malonamide N, N'-dimethyl-N, N'-dibutyl, tetradecylmalonamide

Energy Technology Data Exchange (ETDEWEB)

Daldon, M

1999-07-01

The kinetics of extraction of lanthanides (III) and actinides (III) nitrates by the molecule N, N'-dimethyl - N, N'-dibutyl tetra-decyl malonamide has been investigated. This study was realised with a new constant interfacial-area-stirred cell. During the qualification step of the device it appears that the reduction of the device can lead to hydrolytic perturbations. The main conclusions are: - after the determination of conditions which provide kinetics regime (diffusion of species neglectable), partial orders of the kinetics law have been obtained and lead to the establishment of the law J = k [Nd{sup 3+}] [NO{sub 3}{sup -}]{sup 3} [diamide]{sup 1}, - interfacial tension measurements and kinetics study in presence of surface-active compounds proved that the chemical limiting reaction for Nd(III) is interfacial, - the results allow to propose an adsorption-desorption reaction mechanism, - a comprehensive study of the extraction kinetics of the lanthanides(III) series and also Am(III) and Cm(III) nitrates has been realised. The lighter lanthanides (La, Ce and Pr) exhibit higher kinetics rate of extraction than the others, which differs from the tendency observed with distribution coefficients which exhibit tetrad effect. The kinetics rate of extraction of Am(III) and Cm(III) is closed to the value of Eu(III). (author)

Lanthanoplatins: emissive Eu(iii) and Tb(iii) complexes staining nucleoli targeted through Pt-DNA crosslinking.

Science.gov (United States)

Singh, Khushbu; Singh, Swati; Srivastava, Payal; Sivakumar, Sri; Patra, Ashis K

2017-06-01

Two highly luminescent water-soluble heterometallic LnPt 2 complexes, [{cis-PtCl(NH 3 ) 2 } 2 Ln(L)(H 2 O)](NO 3 ) 2 (Ln = Eu (1), Tb (2)), have been designed for their selective nucleoli staining through formation of Pt-DNA crosslinks. The complexes showed significant cellular uptake and distinctive nucleoli localization through intrinsic emission from Eu III or Tb III observed through confocal fluorescence microscopy.

Improved sensitivity for W-band Gd(III)-Gd(III) and nitroxide-nitroxide DEER measurements with shaped pulses

Science.gov (United States)

Bahrenberg, Thorsten; Rosenski, Yael; Carmieli, Raanan; Zibzener, Koby; Qi, Mian; Frydman, Veronica; Godt, Adelheid; Goldfarb, Daniella; Feintuch, Akiva

2017-10-01

Chirp and shaped pulses have been recently shown to be highly advantageous for improving sensitivity in DEER (double electron-electron resonance, also called PELDOR) measurements due to their large excitation bandwidth. The implementation of such pulses for pulse EPR has become feasible due to the availability of arbitrary waveform generators (AWG) with high sampling rates to support pulse shaping for pulses with tens of nanoseconds duration. Here we present a setup for obtaining chirp pulses on our home-built W-band (95 GHz) spectrometer and demonstrate its performance on Gd(III)-Gd(III) and nitroxide-nitroxide DEER measurements. We carried out an extensive optimization procedure on two model systems, Gd(III)-PyMTA-spacer-Gd(III)-PyMTA (Gd-PyMTA ruler; zero-field splitting parameter (ZFS) D ∼ 1150 MHz) as well as nitroxide-spacer-nitroxide (nitroxide ruler) to evaluate the applicability of shaped pulses to Gd(III) complexes and nitroxides, which are two important classes of spin labels used in modern DEER/EPR experiments. We applied our findings to ubiquitin, doubly labeled with Gd-DOTA-monoamide (D ∼ 550 MHz) as a model for a system with a small ZFS. Our experiments were focused on the questions (i) what are the best conditions for positioning of the detection frequency, (ii) which pump pulse parameters (bandwidth, positioning in the spectrum, length) yield the best signal-to-noise ratio (SNR) improvements when compared to classical DEER, and (iii) how do the sample's spectral parameters influence the experiment. For the nitroxide ruler, we report an improvement of up to 1.9 in total SNR, while for the Gd-PyMTA ruler the improvement was 3.1-3.4 and for Gd-DOTA-monoamide labeled ubiquitin it was a factor of 1.8. Whereas for the Gd-PyMTA ruler the two setups pump on maximum and observe on maximum gave about the same improvement, for Gd-DOTA-monoamide a significant difference was found. In general the choice of the best set of parameters depends on the D

Reactions of sigma-bonded organochromium(III)complexes

International Nuclear Information System (INIS)

Leslie, J.P. II.

1975-12-01

Three projects were carried out, each dealing with the kinetics and mechanism of reactions of sigma-bonded organochromium(III) complexes of the form (H 2 O) 5 CrR 2+ . Part I describes the kinetics of the reaction of dichloromethylchromium(III) ion with chromium(II) ion in aqueous acid. Part II deals with the radioexchange of 4-pyridinomethylchromium(III) ion with 51 Cr 2+ and the kinetics of formation of the organochromium species at 55 0 in 1 M H + . Part III deals with the reactions of Hg 2+ and CH 3 Hg + with a series of (H 2 O) 5 CrR 2+ complexes, in which R is an aliphatic alkyl group, a haloalkyl group, or an aralkyl group

Solar neutrino oscillation parameters after SNO Phase-III and SAGE Part-III

International Nuclear Information System (INIS)

Yang Ping; Liu Qiuyu

2009-01-01

We analyse the recently published results from solar neutrino experiments SNO Phase-III and SAGE Part-III and show their constraints on solar neutrino oscillation parameters, especially for the mixing angle θ 12 . Through a global analysis using all existing data from SK, SNO, Ga and Cl radiochemical experiments and long base line reactor experiment KamLAND , we obtain the parameters Δm 12 2 =7.684 -0.208 +0.212 x 10 -5 eV 2 , tan 2 θ 12 =0.440 -0.057 +0.059 . We also find that the discrepancy between the KamLAND and solar neutrino results can be reduced by choosing a small non-zero value for the mixing angle θ 13 . (authors)

Biochemical and Structural Properties of Mouse Kynurenine Aminotransferase III

Energy Technology Data Exchange (ETDEWEB)

Han, Q.; Robinson, H; Cai, T; Tagle, D; Li, J

2009-01-01

Kynurenine aminotransferase III (KAT III) has been considered to be involved in the production of mammalian brain kynurenic acid (KYNA), which plays an important role in protecting neurons from overstimulation by excitatory neurotransmitters. The enzyme was identified based on its high sequence identity with mammalian KAT I, but its activity toward kynurenine and its structural characteristics have not been established. In this study, the biochemical and structural properties of mouse KAT III (mKAT III) were determined. Specifically, mKAT III cDNA was amplified from a mouse brain cDNA library, and its recombinant protein was expressed in an insect cell protein expression system. We established that mKAT III is able to efficiently catalyze the transamination of kynurenine to KYNA and has optimum activity at relatively basic conditions of around pH 9.0 and at relatively high temperatures of 50 to 60C. In addition, mKAT III is active toward a number of other amino acids. Its activity toward kynurenine is significantly decreased in the presence of methionine, histidine, glutamine, leucine, cysteine, and 3-hydroxykynurenine. Through macromolecular crystallography, we determined the mKAT III crystal structure and its structures in complex with kynurenine and glutamine. Structural analysis revealed the overall architecture of mKAT III and its cofactor binding site and active center residues. This is the first report concerning the biochemical characteristics and crystal structures of KAT III enzymes and provides a basis toward understanding the overall physiological role of mammalian KAT III in vivo and insight into regulating the levels of endogenous KYNA through modulation of the enzyme in the mouse brain.

Subtle interactions and electron transfer between U{sup III}, Np{sup III}, or Pu{sup III} and uranyl mediated by the oxo group

Energy Technology Data Exchange (ETDEWEB)

Arnold, Polly L.; Zegke, Markus; Hollis, Emmalina; Pecharman, Anne-Frederique; Love, Jason B. [EaStCHEM School of Chemistry, University of Edinburgh (United Kingdom); Dutkiewicz, Michal S. [EaStCHEM School of Chemistry, University of Edinburgh (United Kingdom); European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Karlsruhe (Germany); Walter, Olaf; Apostolidis, Christos; Magnani, Nicola; Griveau, Jean-Christophe; Colineau, Eric; Caciuffo, Roberto [European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Karlsruhe (Germany); Zhang, Xiaobin; Schreckenbach, Georg [Department of Chemistry, University of Manitoba, Winnipeg, MB (Canada)

2016-10-04

A dramatic difference in the ability of the reducing An{sup III} center in AnCp{sub 3} (An=U, Np, Pu; Cp=C{sub 5}H{sub 5}) to oxo-bind and reduce the uranyl(VI) dication in the complex [(UO{sub 2})(THF)(H{sub 2}L)] (L=''Pacman'' Schiff-base polypyrrolic macrocycle), is found and explained. These are the first selective functionalizations of the uranyl oxo by another actinide cation. At-first contradictory electronic structural data are explained by combining theory and experiment. Complete one-electron transfer from Cp{sub 3}U forms the U{sup IV}-uranyl(V) compound that behaves as a U{sup V}-localized single molecule magnet below 4 K. The extent of reduction by the Cp{sub 3}Np group upon oxo-coordination is much less, with a Np{sup III}-uranyl(VI) dative bond assigned. Solution NMR and NIR spectroscopy suggest Np{sup IV}U{sup V} but single-crystal X-ray diffraction and SQUID magnetometry suggest a Np{sup III}-U{sup VI} assignment. DFT-calculated Hirshfeld charge and spin density analyses suggest half an electron has transferred, and these explain the strongly shifted NMR spectra by spin density contributions at the hydrogen nuclei. The Pu{sup III}-U{sup VI} interaction is too weak to be observed in THF solvent, in agreement with calculated predictions. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

Modal Profiles for the WISC-III.

Science.gov (United States)

Pritchard, David A.; Livingston, Ronald B.; Reynolds, Cecil R.; Moses, James A., Jr.

2000-01-01

Presents a normative typology for classifying the Wechsler Intelligence Scale for Children-Third Edition (WISC-III) factor index profiles according to profile shape. Current analyses indicate that overall profile level accounted for a majority of the variance in WISC-III index scores, but a considerable proportion of the variance was because of…

Interaction between gold (III) chloride and potassium hexacyanoferrate (II/III)-Does it lead to gold analogue of Prussian blue?

Energy Technology Data Exchange (ETDEWEB)

Harish, S. [Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630006, Tamilnadu (India); Joseph, James, E-mail: jameskavlam@yahoo.com [Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630006, Tamilnadu (India); Phani, K.L.N. [Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630006, Tamilnadu (India)

2011-06-30

Highlights: > In group IB, Cu and Ag form Prussian blue analogues but similar formation of gold hexacyanoferrate was not found in the literature and non-existence of gold hexacyanoferrate remains a mystery. > Potential cycling of gold chloride and potassium ferro/ferri cyanide was resulted in the formation of Au-PB nano-composite. > Redox reaction between gold chloride and potassium ferrocyanide ion is spontaneous but no reaction occurs when gold chloride and potassium ferricyanide is mixed. > We are proposing the formation of a compound with general formula 'KFe{sub x}[Au(CN){sub 2}]{sub y}' and discussing the formation of gold hexacyanoferrate is not feasible by simple chemical or electrochemical reaction in contrast to other PB analogues. - Abstract: Prussian blue analogues are a class of compounds formed by the reaction between metal salt and potassium hexacyanoferrate (II/III). In our earlier report, the formation of Au-Prussian blue nano-composite was noticed on potential cycling the glassy carbon electrode in a medium containing gold (III) chloride and potassium hexacyanoferrate (III). Hence in this work, the formation of gold hexacyanoferrate was attempted by a simple chemical reaction. The reaction of gold (III) chloride with potassium hexacyanoferrate (II/III) was examined by UV-Vis spectroscopy and found that there is no redox reaction between gold (III) chloride and potassium hexacyanoferrate (III). However, the redox reaction occurs between gold (III) chloride and potassium hexacyanoferrate (II) leading to the formation of charge transfer band and the conversion of hexacyanoferrate (II) to hexacyanoferrate (III) was evidenced by the emergence of new absorption peaks in UV-Vis spectra. The oxidation state of gold in Au-Fe complex was found to be +1 from X-ray photoelectron spectroscopy. The stability of the Au-Fe complex was also studied by cyclic voltammetry. Cyclic voltammetric results indicated the presence of high spin iron in Au

Interaction between gold (III) chloride and potassium hexacyanoferrate (II/III)-Does it lead to gold analogue of Prussian blue?

International Nuclear Information System (INIS)

Harish, S.; Joseph, James; Phani, K.L.N.

2011-01-01

Highlights: → In group IB, Cu and Ag form Prussian blue analogues but similar formation of gold hexacyanoferrate was not found in the literature and non-existence of gold hexacyanoferrate remains a mystery. → Potential cycling of gold chloride and potassium ferro/ferri cyanide was resulted in the formation of Au-PB nano-composite. → Redox reaction between gold chloride and potassium ferrocyanide ion is spontaneous but no reaction occurs when gold chloride and potassium ferricyanide is mixed. → We are proposing the formation of a compound with general formula 'KFe x [Au(CN) 2 ] y ' and discussing the formation of gold hexacyanoferrate is not feasible by simple chemical or electrochemical reaction in contrast to other PB analogues. - Abstract: Prussian blue analogues are a class of compounds formed by the reaction between metal salt and potassium hexacyanoferrate (II/III). In our earlier report, the formation of Au-Prussian blue nano-composite was noticed on potential cycling the glassy carbon electrode in a medium containing gold (III) chloride and potassium hexacyanoferrate (III). Hence in this work, the formation of gold hexacyanoferrate was attempted by a simple chemical reaction. The reaction of gold (III) chloride with potassium hexacyanoferrate (II/III) was examined by UV-Vis spectroscopy and found that there is no redox reaction between gold (III) chloride and potassium hexacyanoferrate (III). However, the redox reaction occurs between gold (III) chloride and potassium hexacyanoferrate (II) leading to the formation of charge transfer band and the conversion of hexacyanoferrate (II) to hexacyanoferrate (III) was evidenced by the emergence of new absorption peaks in UV-Vis spectra. The oxidation state of gold in Au-Fe complex was found to be +1 from X-ray photoelectron spectroscopy. The stability of the Au-Fe complex was also studied by cyclic voltammetry. Cyclic voltammetric results indicated the presence of high spin iron in Au-Fe complex. Hence 'as

Disproportionation of hydroxylamine by water-soluble iron(III) porphyrinate compounds.

Science.gov (United States)

Bari, Sara E; Amorebieta, Valentín T; Gutiérrez, María M; Olabe, José A; Doctorovich, Fabio

2010-01-01

The reactions of hydroxylamine (HA) with several water-soluble iron(III) porphyrinate compounds, namely iron(III) meso-tetrakis-(N-ethylpyridinium-2yl)-porphyrinate ([Fe(III)(TEPyP)](5+)), iron(III) meso-tetrakis-(4-sulphonatophenyl)-porphyrinate ([Fe(III)(TPPS)](3-)), and microperoxidase 11 ([Fe(III)(MP11)]) were studied for different [Fe(III)(Porph)]/[HA] ratios, under anaerobic conditions at neutral pH. Efficient catalytic processes leading to the disproportionation of HA by these iron(III) porphyrinates were evidenced for the first time. As a common feature, only N(2) and N(2)O were found as gaseous, nitrogen-containing oxidation products, while NH(3) was the unique reduced species detected. Different N(2)/N(2)O ratios obtained with these three porphyrinates strongly suggest distinctive mechanistic scenarios: while [Fe(III)(TEPyP)](5+) and [Fe(III)(MP11)] formed unknown steady-state porphyrinic intermediates in the presence of HA, [Fe(III)(TPPS)](3-) led to the well characterized soluble intermediate, [Fe(II)(TPPS)NO](4-). Free-radical formation was only evidenced for [Fe(III)(TEPyP)](5+), as a consequence of a metal centered reduction. We discuss the catalytic pathways of HA disproportionation on the basis of the distribution of gaseous products, free radicals formation, the nature of porphyrinic intermediates, the Fe(II)/Fe(III) redox potential, the coordinating capabilities of each complex, and the kinetic analysis. The absence of NO(2)(-) revealed either that no HAO-like activity was operative under our reaction conditions, or that NO(2)(-), if formed, was consumed in the reaction milieu.

Recent advances on biological production of difructose dianhydride III.

Science.gov (United States)

Zhu, Yingying; Yu, Shuhuai; Zhang, Wenli; Zhang, Tao; Guang, Cuie; Mu, Wanmeng

2018-04-01

Difructose dianhydride III (DFA III) is a cyclic difructose containing two reciprocal glycosidic linkages. It is easily generated with a small amount by sucrose caramelization and thus occurs in a wide range of food-stuffs during food processing. DFA III has half sweetness but only 1/15 energy of sucrose, showing potential industrial application as low-calorie sucrose substitute. In addition, it displays many benefits including prebiotic effect, low cariogenicity property, and hypocholesterolemic effect, and improves absorption of minerals, flavonoids, and immunoglobulin G. DFA III is biologically produced from inulin by inulin fructotransferase (IFTase, EC 4.2.2.18). Plenty of DFA III-producing enzymes have been identified. The crystal structure of inulin fructotransferase has been determined, and its molecular modification has been performed to improve the catalytic activity and structural stability. Large-scale production of DFA III has been studied by various IFTases, especially using an ultrafiltration membrane bioreactor. In this article, the recent findings on physiological effects of DFA III are briefly summarized; the research progresses on identification, expression, and molecular modification of IFTase and large-scale biological production of DFA III by IFTase are reviewed in detail.

Binary and ternary chelates of scandium (III), Yttrium (III) and lanthanum (III) with ethyleneglycol-bis(. beta. -aminoethylether)-tetraacetic acid as primary and substituted salicylic acids as secondary ligands

Energy Technology Data Exchange (ETDEWEB)

Pandey, A K; Chandra, M; Agarwala, B V; Dey, A K [Allahabad Univ. (India). Chemical Labs.

1980-01-01

Formation constants of binary and ternary complexes of the systems of the type: M-L and M-egta-L (M = scandium(III), yttrium(III) and lanthanum(III), egta = ethylene glycol-bis(..beta..-aminoethylether)-tetra acetic acid, L = o-cresotic acid (o-ca), m-cresotic acid (m-ca), 5-chlorosalicyclic acid(csa), and 3,5-dibromosalicylic acid (dbsa)) have been determined pH-metrically at 25deg and ..mu.. = 0.1M (KNO/sub 3/) in 50% (v/v) aqueous-ethanol medium. The order of stabilities of ternary complexes has been compared with those of corresponding binary complexes, and results discussed on the basis of coulombic interactions.

PARDISEKO III

International Nuclear Information System (INIS)

Jordan, H.; Sack, C.

1975-05-01

This report gives a detailed description of the latest version of the PARDISEKO code, PARDISEKO III, with particular emphasis on the numerical and programming methods employed. The physical model and its relation to nuclear safety as well as a description and the results of confirming experiments are treated in detail in the Karlsruhe Nuclear Research Centre report KFK-1989. (orig.) [de

The role of Ce(III) in BZ oscillating reactions

Science.gov (United States)

Nogueira, Paulo A.; Varela, Hamilton; Faria, Roberto B.

2012-03-01

Herein we present results on the oscillatory dynamics in the bromate-oxalic acid-acetone-Ce(III)/Ce(IV) system in batch and also in a CSTR. We show that Ce(III) is the necessary reactant to allow the emergence of oscillations. In batch, oscillations occur with Ce(III) and also with Ce(IV), but no induction period is observed with Ce(III). In a CSTR, no oscillations were found using a freshly prepared Ce(IV), but only when the cerium-containing solution was aged, allowing partial conversion of Ce(IV) to Ce(III) by reaction with acetone.

Improved Antileishmanial Activity of Dppz through Complexation with Antimony(III and Bismuth(III: Investigation of the Role of the Metal

Directory of Open Access Journals (Sweden)

Cynthia Demicheli

2012-10-01

Full Text Available Two novel trivalent antimony(III and bismuth(III complexes with the nitrogen-donor heterocyclic ligand dipyrido[3,2-a:2',3'-c]phenazine (dppz were synthesized and characterized as [Sb(dppzCl3]∙H2O∙CH3OH and [Bi(dppzCl3]. The crystal structure of Sb(III complex was determined by X-ray crystallography. These complexes were evaluated for their activity against the promastigote form of Sb(III-sensitive and –resistant Leishmania infantum chagasi and Leishmania amazonensis strains. Both complexes were more effective than dppz alone in inhibiting the growth of Leishmania promastigotes and were at least 77 and 2,400 times more active than potassium antimonyl tartrate in Sb(III-sensitive and -resistant Leishmania, respectively. The cytotoxicity of dppz and its complexes against mouse peritoneal macrophages occurred at dppz concentrations at least 6-fold greater than those found to be active against Leishmania promastigotes.To investigate the role of the metal in the improved antileishmanial activity of dppz, the activity of the Sb(III complex was compared between the Sb-resistant mutants and their respective parental sensitive strains. The lack of cross-resistance to the Sb(III-dppz complex together with the much lower activity of antimonyl tartrate, SbCl3 and BiCl3 strongly support the model that the metal is not active by itself but improves the activity of dppz through complexation.

Kinetic of liquid-liquid extraction for uranyl nitrate and actinides (III) and lanthanides (III) nitrates by amide extractants

International Nuclear Information System (INIS)

Toulemonde, V.; CEA Centre d'Etudes de la Vallee du Rhone, 30 -Marcoule

1995-01-01

The kinetics of liquid-liquid extraction by amide extractants have been investigated for uranyl nitrate (monoamide extractants), actinides (III) and lanthanides (III) nitrates (diamide extractants). The transfer of the metallic species from the aqueous phase to the organic phase was studied using two experimental devices: ARMOLLEX (Argonne Modified Lewis cell for Liquid Liquid Extraction) and RSC (Rotating Stabilized Cell). The main conclusions are: for the extraction of uranyl nitrate by DEHDMBA monoamide, the rate-controlling step is the complexation of the species at the interface of the two liquids. Thus, an absorption-desorption (according to Langmuir theory) reaction mechanism was proposed; for the extraction of actinides (III) and lanthanides (III) nitrates in nitric acid media by DMDBTDMA diamide, the kinetic is also limited by interfacial reactions. The behavior of Americium and Europium is very similar as fare as their reaction kinetics are concerned. (author)

Stability constants of mixed ligand complexes of lanthanide(III) and yttrium(III) with complexone and substituted salicylic acids

International Nuclear Information System (INIS)

Kolhe, Vishnu; Dwivedi, K.

1996-01-01

Salicylic acid and substituted salicylic acids are potential antimicrobial agents. Binary complexes of salicylic acid and its substituted derivatives with lanthanide(III) and yttrium(III) metal ions have been reported. There are reports on the ternary metal complexing equilibria with some lanthanide(III) and yttrium(III) metal ions involving aminopolycarboxylic acid as one ligand and salicylic acid (SA) and other related compounds as the second ligands. Ethylene glycol bis(2-aminoethylether)- N, N, N', N'-tetraacetic acid (EGTA) is an important member of aminopolycarboxylic acid and finds many applications in medicine and biology. Recently, few ternary complexes have been reported using EGTA as ligand. In view of biological importance of simple and mixed ligand complexes EGTA, SA and DNSA (3,5-dinitrosalicylic acid), a systematic study has been undertaken for the determination of stability constant and the results are reported. (author). 6 refs., 1 fig., 2 tabs

Control Analysis of Hazards Potential in Crude Distiller Unit III PT. Pertamina (Persero) Refinery Unit III Plaju Tahun 2011

OpenAIRE

Matariani, Ade; Hasyim, Hamzah; Faisya, Achmad Fickry

2012-01-01

Background: Activities in CDU III are very risk to any hazards potential; because of that hazards potential is much needed in controlling the hazards potential to decrease the accidents and occupational diseases. The aim of this study was to analyze the controlling of hazards potential in CDU III PT. Pertamina (Persero) RU III Plaju in 2011. Method: This study was a qualitative study. The methods of data collection were using in-depth interview and observation. The total of informants in this...

Studies in the solubility of Pu(III) oxalate

Energy Technology Data Exchange (ETDEWEB)

Hasilkar, S P; Khedekar, N B; Chander, K; Jadhav, V; Jain, H C [Bhabha Atomic Research Centre, Bombay (India). Fuel Reprocessing Div.

1994-11-01

Studies have been carried out on the solubility of Pu(III) oxalate by precipitation of Pu(III) oxalate from varying concentrations of HNO[sub 3]/HCl (0.5-2.0M) solutions and also by equilibrating freshly prepared Pu(III) oxalate with solutions containing varying concentrations of HNO[sub 3]/HCl, oxalic acid and ascorbic acid. Pu(III) solutions in HNO[sub 3] and HCl media were prepared by reduction of Pu(IV) with ascorbic acid. 0.01-0.10M ascorbic acid concentration in the aqueous solution was maintained as holding reductant. The solubility of Pu(III) oxalate was found to be a minimum in 0.5M-1M HNO[sub 3]/HCl solutions containing 0.05M ascorbic acid and 0.2M excess oxalic acid in the supernatant. (author) 6 refs.; 6 tabs.

Thermometric studies on the Fe(III)-EDTA chelate.

Science.gov (United States)

Dot, K

1978-02-01

A DeltaH of -11.5 +/- 0.5 kJ/mole has been determined for the formation of the Fe(III)-EDTA chelate at 25.0 degrees and mu = 0.1(= [HClO(4)] + [NaClO(4)]) by a direct thermometric titration procedure. The entropy change, DeltaS, has been calculated to be 440 J.mole(-1) .deg(-1) by combining the result of the heat measurements with the free energy change obtained from the stability constant previously determined. A relationship between the DeltaS values and the standard partial molal entropies of the tervalent metal ions is discussed. In addition, conditions for the thermometric titration of Fe(III) with NA(4)EDTA at room temperature have been investigated. Iron(III) can be determined in the presence of fairly large amounts of phosphate, Cr(III), Mn(II) and Al(III).

The [Fe(III)[Fe(III)(L1)2]3] star-type single-molecule magnet.

Science.gov (United States)

Saalfrank, Rolf W; Scheurer, Andreas; Bernt, Ingo; Heinemann, Frank W; Postnikov, Andrei V; Schünemann, Volker; Trautwein, Alfred X; Alam, Mohammad S; Rupp, Holger; Müller, Paul

2006-06-21

Star-shaped complex [Fe(III)[Fe(III)(L1)2]3] (3) was synthesized starting from N-methyldiethanolamine H2L1 (1) and ferric chloride in the presence of sodium hydride. For 3, two different high-spin iron(III) ion sites were confirmed by Mössbauer spectroscopy at 77 K. Single-crystal X-ray structure determination revealed that 3 crystallizes with four molecules of chloroform, but, with only three molecules of dichloromethane. The unit cell of 3.4CHCl3 contains the enantiomers (delta)-[(S,S)(R,R)(R,R)] and (lambda)-[(R,R)(S,S)(S,S)], whereas in case of 3.3CH2Cl2 four independent molecules, forming pairs of the enantiomers [lambda-(R,R)(R,R)(R,R)]-3 and [lambda-(S,S)(S,S)(S,S)]-3, were observed in the unit cell. According to SQUID measurements, the antiferromagnetic intramolecular coupling of the iron(III) ions in 3 results in a S = 10/2 ground state multiplet. The anisotropy is of the easy-axis type. EPR measurements enabled an accurate determination of the ligand-field splitting parameters. The ferric star 3 is a single-molecule magnet (SMM) and shows hysteretic magnetization characteristics below a blocking temperature of about 1.2 K. However, weak intermolecular couplings, mediated in a chainlike fashion via solvent molecules, have a strong influence on the magnetic properties. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) were used to determine the structural and electronic properties of star-type tetranuclear iron(III) complex 3. The molecules were deposited onto highly ordered pyrolytic graphite (HOPG). Small, regular molecule clusters, two-dimensional monolayers as well as separated single molecules were observed. In our STS measurements we found a rather large contrast at the expected locations of the metal centers of the molecules. This direct addressing of the metal centers was confirmed by DFT calculations.

Aqueous phase complexation of Cm(III) and Cf(III) with ionizable macrocyclic ligands

International Nuclear Information System (INIS)

Manchanda, V.K.; Mohapatra, P.K.

1995-01-01

Complexation behaviour of Cm(III) and Cf(III) with 1,7-diaza-4,10,13-trioxacyclopentadecane-N,N'-diacetic acid (K21DA), 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-N,N'-diacetic acid (K22DA) and ethylene diamine N,N'- diacetic acid (EDDA) has been investigated using dinonyl naphthalene sulphonic acid (DNNS), in tetramethyl ammonium form as liquid cation exchanger. The aqueous phase complex formation constants are computed from the distribution data. Though larger complex formation constants are observed with K21DA as well as K22DA compared to those with the acyclic analog EDDA, no size correlation is observed. (author). 5 refs., 1 tab

Analogues of Cucurbita maxima trypsin inhibitor III (CMTI-III) with elastase inhibitory activity.

Science.gov (United States)

Rózycki, J; Kupryszewski, G; Rolka, K; Ragnarsson, U; Zbyryt, T; Krokoszyńska, I; Wilusz, T

1994-04-01

Three new CMTI-III analogues containing the Val residue in the reactive site (position 5) were synthesized by the solid-phase method. The analogues displayed an elastase inhibitory activity. It is shown that the removal of the N-terminal Arg residue and the introduction of the Gly-Pro-Gln tripeptide in the region 23-25 decreases the antielastase activity by two orders of magnitude. The removal of the disulfide bridge in positions 16-28 and the substitution of Ala for Cys16 and Gly for Cys28 decreases the activity (measured as Ka with HLE) by five orders of magnitude as compared with [Val5]CMTI-III.

The glycomic effect of N-acetylglucosaminyltransferase III overexpression in metastatic melanoma cells. GnT-III modifies highly branched N-glycans.

Science.gov (United States)

Link-Lenczowski, Paweł; Bubka, Monika; Balog, Crina I A; Koeleman, Carolien A M; Butters, Terry D; Wuhrer, Manfred; Lityńska, Anna

2018-04-01

N-acetylglucosaminyltransferase III (GnT-III) is known to catalyze N-glycan "bisection" and thereby modulate the formation of highly branched complex structures within the Golgi apparatus. While active, it inhibits the action of other GlcNAc transferases such as GnT-IV and GnT-V. Moreover, GnT-III is considered as an inhibitor of the metastatic potential of cancer cells both in vitro and in vivo. However, the effects of GnT-III may be more diverse and depend on the cellular context. We describe the detailed glycomic analysis of the effect of GnT-III overexpression in WM266-4-GnT-III metastatic melanoma cells. We used MALDI-TOF and ESI-ion-trap-MS/MS together with HILIC-HPLC of 2-AA labeled N-glycans to study the N-glycome of membrane-attached and secreted proteins. We found that the overexpression of GnT-III in melanoma leads to the modification of a broad range of N-glycan types by the introduction of the "bisecting" GlcNAc residue with highly branched complex structures among them. The presence of these unusual complex N-glycans resulted in stronger interactions of cellular glycoproteins with the PHA-L. Based on the data presented here we conclude that elevated activity of GnT-III in cancer cells does not necessarily lead to a total abrogation of the formation of highly branched glycans. In addition, the modification of pre-existing N-glycans by the introduction of "bisecting" GlcNAc can modulate their capacity to interact with carbohydrate-binding proteins such as plant lectins. Our results suggest further studies on the biological function of "bisected" oligosaccharides in cancer cell biology and their interactions with carbohydrate-binding proteins.

C III] EMISSION IN STAR-FORMING GALAXIES NEAR AND FAR

Energy Technology Data Exchange (ETDEWEB)

Rigby, J. R. [Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States); Bayliss, M. B. [Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138 (United States); Gladders, M. D. [Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60637 (United States); Sharon, K.; Johnson, T. [Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109 (United States); Wuyts, E. [Max Plank Institute for Extraterrestrial Physics, Giessenbachstrasse 1, D-85748 Garching (Germany); Dahle, H. [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, NO-0315 Oslo (Norway); Peña-Guerrero, M. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2015-11-20

We measure [C iii] 1907, C iii] 1909 Å emission lines in 11 gravitationally lensed star-forming galaxies at z ∼ 1.6–3, finding much lower equivalent widths than previously reported for fainter lensed galaxies. While it is not yet clear what causes some galaxies to be strong C iii] emitters, C iii] emission is not a universal property of distant star-forming galaxies. We also examine C iii] emission in 46 star-forming galaxies in the local universe, using archival spectra from GHRS, FOS, and STIS on HST and IUE. Twenty percent of these local galaxies show strong C iii] emission, with equivalent widths < −5 Å. Three nearby galaxies show C iii] emission equivalent widths as large as the most extreme emitters yet observed in the distant universe; all three are Wolf–Rayet galaxies. At all redshifts, strong C iii] emission may pick out low-metallicity galaxies experiencing intense bursts of star formation. Such local C iii] emitters may shed light on the conditions of star formation in certain extreme high-redshift galaxies.

Extraction of Am (III) and Nd (III): comparison of TODGA and TEHDGA

International Nuclear Information System (INIS)

Gujar, R.B.; Murali, M.S.; Ansari, S.A.; Manchanda, V.K.

2009-01-01

Belonging to the class of extractants, diglycolamides which are recently explored and promising for actinide partitioning, two reagents (N, N, N', N'-tetraoctyl diglycolamide) TODGA and its isomerically substituted counterpart, (N, N, N', N'- tetraethylhexyl diglycolamide) TEHDGA after addition of suitable phase modifiers, Dihexyoctanamide and isodecanol respectively in dodecane have been compared in their extraction abilities for Am (III) and Nd (III) from nitric acid as well as simulated high-level waste solutions (SHLW) equivalent to HLW arising from PHWR fuel reprocessing. Both 0.1M TODGA + 0.5M DHOA and 0.2M TEHDGA + 30% isodecanol in dodecane display high distribution ratios for the trivalent metal ions of f-elements. Similarities and differences in their extraction are discussed. (author)

Cr(III), Fe(III) and Co(III) complexes of tetradentate (ONNO) Schiff base ligands: Synthesis, characterization, properties and biological activity

Science.gov (United States)

Keskioğlu, Eren; Gündüzalp, Ayla Balaban; Çete, Servet; Hamurcu, Fatma; Erk, Birgül

2008-08-01

A series of metal complexes were synthesized from equimolar amounts of Schiff bases: 1,4-bis[3-(2-hydroxy-1-naphthaldimine)propyl]piperazine (bappnaf) and 1,8-bis[3-(2-hydroxy-1-naphthaldimine)- p-menthane (damnaf) with metal chlorides. All of synthesized compounds were characterized by elemental analyses, spectral (UV-vis, IR, 1H- 13C NMR, LC-MS) and thermal (TGA-DTA) methods, magnetic and conductance measurements. Schiff base complexes supposed in tetragonal geometry have the general formula [M(bappnaf or damnaf)]Cl· nH 2O, where M = Cr(III), Co(III) and n = 2, 3. But also Fe(III) complexes have octahedral geometry by the coordination of two water molecules and the formula is [Fe(bappnaf or damnaf)(H 2O) 2]Cl. The changes in the selected vibration bands in FT-IR indicate that Schiff bases behave as (ONNO) tetradentate ligands and coordinate to metal ions from two phenolic oxygen atoms and two azomethine nitrogen atoms. Conductance measurements suggest 1:1 electrolytic nature of the metal complexes. The synthesized compounds except bappnaf ligand have the antimicrobial activity against the bacteria: Escherichia coli (ATCC 11230), Yersinia enterocolitica (ATCC 1501), Bacillus magaterium (RSKK 5117), Bacillus subtilis (RSKK 244), Bacillus cereus (RSKK 863) and the fungi: Candida albicans (ATCC 10239). These results have been considerably interest in piperazine derivatives due to their significant applications in antimicrobial studies.

Spectroscopic studies on the interaction of europium(III) and curium(III) with components of the human mucosa

Energy Technology Data Exchange (ETDEWEB)

Wilke, Claudia; Barkleit, Astrid [Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden (Germany). Div. Chemistry of the F-Elements

2016-07-01

To evaluate the health risks of lanthanides (Ln) and radiotoxic actinides (An) in case of ingestion accidents etc., investigations into the chemical reactions of these metals in the human gastrointestinal tract are necessary. Our previous study revealed that mucin, an important part of the protective mucosa layer in the digestive system, shows a strong interaction with Eu(III). Based on these results, the present study focuses on the components of this glycoprotein and identified N-acetylneuraminic acid (NANA) as the dominant binding carbohydrate of mucin. TRLFS measurements suggest the formation of a 1: 1 complex with log β of 3.2 ± 0.1 for Eu(III) and 3.3 ± 0.1 for Cm(III), respectively.

2 : 2 Fe(III): ligand and "adamantane core" 4 : 2 Fe(III): ligand (hydr)oxo complexes of an acyclic ditopic ligand

DEFF Research Database (Denmark)

Ghiladi, Morten; Larsen, Frank B.; McKenzie, Christine J.

2005-01-01

A bis-hydroxo-bridged diiron(III) complex and a bis-mu-oxo-bis-mu-hydroxo-bridged tetrairon( III) complex are isolated from the reaction of 2,6-bis((N, N'-bis-(2-picolyl) amino) methyl)-4-tert-butylphenol (Hbpbp) with iron perchlorate in acidic and neutral solutions respectively. The X-ray struct......A bis-hydroxo-bridged diiron(III) complex and a bis-mu-oxo-bis-mu-hydroxo-bridged tetrairon( III) complex are isolated from the reaction of 2,6-bis((N, N'-bis-(2-picolyl) amino) methyl)-4-tert-butylphenol (Hbpbp) with iron perchlorate in acidic and neutral solutions respectively. The X...

Earth Science With the Stratospheric Aerosol and Gas Experiment III (SAGE III) on the International Space Station

Science.gov (United States)

Zawodny, Joe; Vernier, Jean-Paul; Thomason, Larry; Roell, Marilee; Pitts, Mike; Moore, Randy; Hill, Charles; Flittner, David; Damadeo, Rob; Cisewski, Mike

2015-01-01

The Stratospheric Aerosol and Gas Experiment (SAGE) III is the fourth generation of solar occultation instruments operated by NASA, the first coming under a different acronym, to investigate the Earth's upper atmosphere. Three flight-ready SAGE III instruments were built by Ball Aerospace in the late 1990s, with one launched aboard the former Russian Aviation and Space Agency (now known as Roskosmos) Meteor-3M platform on 10 December 2001 (continuing until the platform lost power in 2006). Another of the original instruments was manifested for the ISS in the 2004 time frame, but was delayed because of budgetary considerations. Fortunately, that SAGE III/ISS mission was restarted in 2009 with a major focus upon filling an anticipated gap in ozone and aerosol observation in the second half of this decade. Here we discuss the mission architecture, its implementation, and data that will be produced by SAGE III/ISS, including their expected accuracy and coverage. The 52-degree inclined orbit of the ISS is well-suited for solar occultation and provides near-global observations on a monthly basis with excellent coverage of low and mid-latitudes. This is similar to that of the SAGE II mission (1985-2005), whose data set has served the international atmospheric science community as a standard for stratospheric ozone and aerosol measurements. The nominal science products include vertical profiles of trace gases, such as ozone, nitrogen dioxide and water vapor, along with multi-wavelength aerosol extinction. Though in the visible portion of the spectrum the brightness of the Sun is one million times that of the full Moon, the SAGE III instrument is designed to cover this large dynamic range and also perform lunar occultations on a routine basis to augment the solar products. The standard lunar products were demonstrated during the SAGE III/M3M mission and include ozone, nitrogen dioxide & nitrogen trioxide. The operational flexibility of the SAGE III spectrometer accomplishes

Fermilab III

Energy Technology Data Exchange (ETDEWEB)

Anon.

1990-09-15

The total ongoing plans for Fermilab are wrapped up in the Fermilab III scheme, centrepiece of which is the proposal for a new Main Injector. The Laboratory has been awarded a $200,000 Illinois grant which will be used to initiate environmental assessment and engineering design of the Main Injector, while a state review panel recommended that the project should also benefit from $2 million of funding.

Fermilab III

International Nuclear Information System (INIS)

Anon.

1990-01-01

The total ongoing plans for Fermilab are wrapped up in the Fermilab III scheme, centrepiece of which is the proposal for a new Main Injector. The Laboratory has been awarded a $200,000 Illinois grant which will be used to initiate environmental assessment and engineering design of the Main Injector, while a state review panel recommended that the project should also benefit from $2 million of funding

The OPAL phase III microvertex detector

International Nuclear Information System (INIS)

De Jong, S.

1997-01-01

A description of the OPAL Phase III microvertex detector is given. Special emphasis is put on problems that have been encountered in the installation and operation of the different phases of the OPAL microvertex detector leading to the present Phase III detector and their cures. A short description of the new OPAL radiation monitoring and beam dump system is also given. (orig.)

Graphics Gems III IBM version

CERN Document Server

Kirk, David

1994-01-01

This sequel to Graphics Gems (Academic Press, 1990), and Graphics Gems II (Academic Press, 1991) is a practical collection of computer graphics programming tools and techniques. Graphics Gems III contains a larger percentage of gems related to modeling and rendering, particularly lighting and shading. This new edition also covers image processing, numerical and programming techniques, modeling and transformations, 2D and 3D geometry and algorithms,ray tracing and radiosity, rendering, and more clever new tools and tricks for graphics programming. Volume III also includes a

induced Oxidation of Chromium(iii) by Peroxodisulphate

African Journals Online (AJOL)

formation of Cr(VI) was observed as a first-order process at high [Cr(III)] and as a zero-order process at low [Cr(III)]. ..... thermodynamic equations, adapted to transition state theory. .... A theoretical rate law for the above-mentioned reaction.

Reorientation of the Methyl Group in MAs(III) is the Rate-Limiting Step in the ArsM As(III) S-Adenosylmethionine Methyltransferase Reaction.

Science.gov (United States)

Packianathan, Charles; Li, Jiaojiao; Kandavelu, Palani; Sankaran, Banumathi; Rosen, Barry P

2018-03-01

The most common biotransformation of trivalent inorganic arsenic (As(III)) is methylation to mono-, di-, and trimethylated species. Methylation is catalyzed by As(III) S -adenosylmethionine (SAM) methyltransferase (termed ArsM in microbes and AS3MT in animals). Methylarsenite (MAs(III)) is both the product of the first methylation step and the substrate of the second methylation step. When the rate of the overall methylation reaction was determined with As(III) as the substrate, the first methylation step was rapid, whereas the second methylation step was slow. In contrast, when MAs(III) was used as the substrate, the rate of methylation was as fast as the first methylation step when As(III) was used as the substrate. These results indicate that there is a slow conformational change between the first and second methylation steps. The structure of CmArsM from the thermophilic alga Cyanidioschyzon merolae sp. 5508 was determined with bound MAs(III) at 2.27 Å resolution. The methyl group is facing the solvent, as would be expected when MAs(III) is bound as the substrate rather than facing the SAM-binding site, as would be expected for MAs(III) as a product. We propose that the rate-limiting step in arsenic methylation is slow reorientation of the methyl group from the SAM-binding site to the solvent, which is linked to the conformation of the side chain of a conserved residue Tyr70.

Enhanced fluorescence of Tb(III), Dy(III) perchlorate by salicylic acid in bis(benzoylmethyl) sulfoxide complexes and luminescence mechanism

International Nuclear Information System (INIS)

Li Wenxian; Zheng Yushan; Sun Xiaojun; Chai Wenjuan; Ren Tie; Shi Xiaoyan

2010-01-01

Two novel ternary rare earth perchlorate complexes had been synthesized by using bis(benzoylmethyl) sulfoxide as first ligand (L=C 6 H 5 COCH 2 SOCH 2 COC 6 H 5 ), salicylic acid as second ligand (L ' =C 6 H 4 OHCOO - ). The compounds were characterized by elemental analysis, TG-DSC and molar conductivities in DMF solution. The composition was suggested as [REL 5 L'](ClO 4 ) 2 .nH 2 O (RE=Tb, Dy; n=6, 8 ). Based on IR, 1 HNMR and UV spectra, it showed that the first ligand, bis(benzoylmethyl) sulfoxide (L), bonded with Tb(III), Dy(III) ions by the oxygen atom of sulfinyl group. The second ligand, salicylic acid group (L'), not only bonded with RE(III) ions by one oxygen atom of carboxyl group but also bonded with RE(III) ions by oxygen atom of phenolic hydroxyl group. In bis(benzoylmethyl) sulfoxide system, fluorescent spectra of the complexes showed that the luminescence of Tb(III), Dy(III) ions was enhanced by the second ligand salicylic acid. The ternary complexes had stronger fluorescence than the binary ones where only bis(benzoylmethyl) sulfoxide acted as ligand. Phosphorescent spectra of the two ligands indicated that the coordination of salicylic acid resulted in the matching extent increasing between the triplet state of ligand and excited state of the rare earths. The relationship between fluorescence lifetime and fluorescence intensity was also discussed.

Uptake Of Trivalent Actinides (Cm(III)) And Lanthanides (Eu(III)) By Cement-Type Minerals: A Wet Chemistry And Time-Resolved Laser Fluorescence Spectroscopy (TRLFS) Study

Energy Technology Data Exchange (ETDEWEB)

Tits, J.; Stumpf, T; Wieland, E.; Fanghaenel, T

2003-03-01

The interaction of the two chemical homologues Cm (III) and Eu(III) with calcium silicate hydrates at pH 13.3 has been investigated in batch-type sorption studies using Eu(III), and complemented with time-resolved laser fluorescence spectroscopy using Cm(III). The sorption data for Eu(III) reveal fast sorption kinetics, and a strong uptake by CSH phases, with distribution ratios of 6({+-}3)*105 L kg-1. Three different types of sorbed Cm(III) species have been identified: a non-fluorescing species, which was identified as Cm cluster present either as surface precipitate or as Cm(III) colloid in solution, and two sorbed fluorescing species. The sorbed fluorescing species have characteristic emission spectra (main peak maxima at 618.9 nm and 620.9 nm) and fluorescence emission lifetimes (289 {+-} 11 ms and 1482{+-} 200 ms). From the fluorescence lifetimes, it appears that the two fluorescing Cm(III) species have, respectively, one to two or no water molecules left in their first coordination sphere, suggesting that these species are incorporated into the CSH structure. A structural model for Cm(III) and Eu(III) incorporation into CSH phases is proposed based on the substitution of Ca at two different types of sites in the CSH structure. (author)

Complexation of Cucurbit(7)uril with Eu(III)

International Nuclear Information System (INIS)

Kar, Aishwarya; Rawat, Neetika; Rao, Ankita; Tomar, B.S.; Nayak, S.K.; Ray, Alok

2014-01-01

Cucurbiturils (CBs) CB(n)s are macrocyclic molecules with carbonyl groups at the portals, which bind cations through ion dipole interactions and the cavity which stabilize hydrophobic moieties. The size of the portal and the volume of the interior cavities of CB(n)s are dependent on the number of glycoluril units present in CBs. CBs are widely used as supramolecular host systems in applications, such as formation of supramolecular hydrogels, drug delivery systems. Though the binding of CBs with organic guest molecules have been studied extensively where as metal complexation studies are very few. In the present work, complexation studies of Cucurbit(7)uril (with seven glycouril units, CB7) with Eu(III) were carried out using fluorescence, UV-vis spectrophotometry. The stability constant for 1:1 complex CB7-Eu(III) complex determined by monitoring the change in CB7 UV- vis absorption spectra on addition of Eu(III) was found to be 2.99 ± 0.08. The fluorescence spectra of increasing ligand to metal ratio exhibited the increase in the intensity ratio of peak at 616 and 592 which is the measure of complexation of Eu(III) with CB7 and was used to deduce the stability constant and the value (2.82 ± 0.07) obtained was in good agreement with that obtained from UV vis spectroscopy. Further, the life time of Eu(III) ion, which increased with CB7 to Eu(III) ratio, was used to deduce number of water molecules around Eu(III) metal ion which were found to decrease from 9 to 3 thereby suggesting inner sphere complexation. The stability constant of CB7 with Eu(III) is one order of magnitude less than CB5, derived in separate study by authors. The smaller cavity of CB5 (2.4 A 0 ) favors its interactions with Eu(III) ion of comparable diameter (2.16 A 0 ) leading to higher stability constant compared to CB7 (5.4 A 0 ) having larger cavity

As(III) oxidation by MnO2 during groundwater treatment.

Science.gov (United States)

Gude, J C J; Rietveld, L C; van Halem, D

2017-03-15

The top layer of natural rapid sand filtration was found to effectively oxidise arsenite (As(III)) in groundwater treatment. However, the oxidation pathway has not yet been identified. The aim of this study was to investigate whether naturally formed manganese oxide (MnO 2 ), present on filter grains, could abiotically be responsible for As(III) oxidation in the top of a rapid sand filter. For this purpose As(III) oxidation with two MnO 2 containing powders was investigated in aerobic water containing manganese(II) (Mn(II)), iron(II) (Fe(II)) and/or iron(III) (Fe(III)). The first MnO 2 powder was a very pure - commercially available - natural MnO 2 powder. The second originated from a filter sand coating, produced over 22 years in a rapid filter during aeration and filtration. Jar test experiments showed that both powders oxidised As(III). However, when applying the MnO 2 in aerated, raw groundwater, As(III) removal was not enhanced compared to aeration alone. It was found that the presence of Fe(II)) and Mn(II) inhibited As(III) oxidation, as Fe(II) and Mn(II) adsorption and oxidation were preferred over As(III) on the MnO 2 surface (at pH 7). Therefore it is concluded that just because MnO 2 is present in a filter bed, it does not necessarily mean that MnO 2 will be available to oxidise As(III). However, unlike Fe(II), the addition of Fe(III) did not hinder As(III) oxidation on the MnO 2 surface; resulting in subsequent effective As(V) removal by the flocculating hydrous ferric oxides. Copyright © 2016 Elsevier Ltd. All rights reserved.

Kinetic of liquid-liquid extraction for uranyl nitrate and actinides (III) and lanthanides (III) nitrates by amide extractants; Cinetique d`extraction liquide-liquide du nitrate d`uranyle et des nitrates d`actinides (III) et de lanthanides (III) par des extractants a fonction amide

Energy Technology Data Exchange (ETDEWEB)

Toulemonde, V [CEA Centre d` Etudes Nucleaires de Saclay, 91 -Gif-sur-Yvette (France); [CEA Centre d` Etudes de la Vallee du Rhone, 30 -Marcoule (France). Dept. d` Exploitation du Retraitement et de Demantelement

1995-12-20

The kinetics of liquid-liquid extraction by amide extractants have been investigated for uranyl nitrate (monoamide extractants), actinides (III) and lanthanides (III) nitrates (diamide extractants). The transfer of the metallic species from the aqueous phase to the organic phase was studied using two experimental devices: ARMOLLEX (Argonne Modified Lewis cell for Liquid Liquid Extraction) and RSC (Rotating Stabilized Cell). The main conclusions are: for the extraction of uranyl nitrate by DEHDMBA monoamide, the rate-controlling step is the complexation of the species at the interface of the two liquids. Thus, an absorption-desorption (according to Langmuir theory) reaction mechanism was proposed; for the extraction of actinides (III) and lanthanides (III) nitrates in nitric acid media by DMDBTDMA diamide, the kinetic is also limited by interfacial reactions. The behavior of Americium and Europium is very similar as fare as their reaction kinetics are concerned. (author). 89 refs.

La(III) sorption studies on poly(dibenzo-18-crown-6) for the sequential separation of La(III), Th(IV) and U(VI) in L-arginine

International Nuclear Information System (INIS)

Sabale, Sandip; Nikam, Gurunath; Mohite, B.S.

2010-01-01

Poly(dibenzo-18-crown-6) is used as a stationary phase to study the sorption behavior of La(III) in L-arginine medium. The quantitative adsorption of La(III) was found at 1 x 10 -4 to 1 x 10 -6 M L-arginine. 1.0-8.0 M HCl, 0.5-8.0 M HBr and HClO 4 were found to be an efficient eluents for La(III). The capacity of crown polymer for La(III) was found to be 1.37±0.01 mmol/g. The tolerance limit of various cations and anions for La(III) was determined. La(III) was quantitatively separated from other metal ions in binary as well as multicomponent mixtures. The study was extended to sequential separation of La(III), U(VI) and Th(IV). The good separation yields were obtained and have good reproducibility (±2%). The method incorporates the determination of La(III) in real sample. The method is simple, rapid and selective. (author)

SORPTION OF Au(III BY Saccharomyces cerevisiae BIOMASS

Directory of Open Access Journals (Sweden)

Amaria Amaria

2010-07-01

Full Text Available Au(III sorption by S. cerevisiae biomass extracted from beer waste industry was investigated. Experimentally, the sorption was conducted in batch method. This research involved five steps: 1 identification the functional groups present in the S. cerevisiae biomass by infrared spectroscopic technique, 2 determination of optimum pH, 3 determination of the sorption capacity and energy, 4 determination of the sorption type by conducting desorption of sorbed Au(III using specific eluents having different desorption capacity such as H2O (van der Waals, KNO3 (ion exchange, HNO3 (hydrogen bond, and tiourea (coordination bond, 5 determination of effective eluents in Au(III desorption by partial desorption of sorbed Au(III using thiourea, NaCN and KI. The remaining Au(III concentrations in filtrate were analyzed using Atomic Absorption Spectrophotometer. The results showed that: 1 Functional groups of S. cerevisiae biomass that involved in the sorption processes were hydroxyl (-OH, carboxylate (-COO- and amine (-NH2, 2 maximum sorption was occurred at pH 4, equal to 98.19% of total sorption, 3 The sorption capacity of biomass was 133.33 mg/g (6.7682E-04 mol/g and was involved sorption energy 23.03 kJ mol-1, 4 Sorption type was dominated by coordination bond, 5 NaCN was effective eluent to strip Au(III close to 100%.   Keywords: sorption, desorption, S. cerevisiae biomass, Au(III

Extraction of Dy(III and Sm(III with N,N’-dimethyl-N,N’-dioctylsuccinamide

Directory of Open Access Journals (Sweden)

ZHANG ZHENWEI

2005-02-01

Full Text Available This work was focused on the applicability of a new diamide N,N’-dimethyl- N,N’-dioctylsuccinamide (DMDOSA employing cyclohexane as the diluent to extract Dy(III and Sm(III from nitric acid solutions. The extraction from HNO3 was investigated by distributionmeasurements. The stoichiometry of the predominant adducts of DMDOSA with HNO3 is 1:1 (HNO3 .DMDOSA under the studied conditions. The effect of the concentrations of nitric acid, lithium nitrate and extractant on the distribution ratio was investigated. An IR spectral study was also made of the extracted species.

Antithrombin III in animal models of sepsis and organ failure.

Science.gov (United States)

Dickneite, G

1998-01-01

Antithrombin III (AT III) is the physiological inhibitor of thrombin and other serine proteases of the clotting cascade. In the development of sepsis, septic shock and organ failure, the plasma levels of AT III decrease considerably, suggesting the concept of a substitution therapy with the inhibitor. A decrease of AT III plasma levels might also be associated with other pathological disorders like trauma, burns, pancreatitis or preclampsia. Activation of coagulation and consumption of AT III is the consequence of a generalized inflammation called SIRS (systemic inflammatory response syndrome). The clotting cascade is also frequently activated after organ transplantation, especially if organs are grafted between different species (xenotransplantation). During the past years AT III has been investigated in numerous corresponding disease models in different animal species which will be reviewed here. The bulk of evidence suggests, that AT III substitution reduces morbidity and mortality in the diseased animals. While gaining more experience with AT III, the concept of substitution therapy to maximal baseline plasma levels (100%) appears to become insufficient. Evidence from clinical and preclinical studies now suggests to adjust the AT III plasma levels to about 200%, i.e., doubling the normal value. During the last few years several authors proposed that AT III might not only be an anti-thrombotic agent, but to have in addition an anti-inflammatory effect.

Antisites in III-V semiconductors: Density functional theory calculations

KAUST Repository

Chroneos, A.; Tahini, Hassan Ali; Schwingenschlö gl, Udo; Grimes, R. W.

2014-01-01

as a function of the Fermi level and under different growth conditions. The formation energies of group III antisites (III V q) decrease with increasing covalent radius of the group V atom though not group III radius, whereas group V antisites (V I I I

CHAOS. III. GAS-PHASE ABUNDANCES IN NGC 5457

Energy Technology Data Exchange (ETDEWEB)

Croxall, Kevin V.; Pogge, Richard W. [Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Berg, Danielle A. [Center for Gravitation, Cosmology and Astrophysics, Department of Physics, University of Wisconsin Milwaukee, 1900 East Kenwood Boulevard, Milwaukee, WI 53211 (United States); Skillman, Evan D. [Minnesota Institute for Astrophysics, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Moustakas, John [Department of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211 (United States)

2016-10-10

We present Large Binocular Telescope observations of 109 H ii regions in NGC 5457 (M101) obtained with the Multi-Object Double Spectrograph. We have robust measurements of one or more temperature-sensitive auroral emission lines for 74 H ii regions, permitting the measurement of “direct” gas-phase abundances. Comparing the temperatures derived from the different ionic species, we find: (1) strong correlations of T [N ii] with T [S iii] and T [O iii], consistent with little or no intrinsic scatter; (2) a correlation of T [S iii] with T [O iii], but with significant intrinsic dispersion; (3) overall agreement between T [N ii], T [S ii], and T [O ii], as expected, but with significant outliers; (4) the correlations of T [N ii] with T [S iii] and T [O iii] match the predictions of photoionization modeling while the correlation of T [S iii] with T [O iii] is offset from the prediction of photoionization modeling. Based on these observations, which include significantly more observations of lower excitation H ii regions, missing in many analyses, we inspect the commonly used ionization correction factors (ICFs) for unobserved ionic species and propose new empirical ICFs for S and Ar. We have discovered an unexpected population of H ii regions with a significant offset to low values in Ne/O, which defies explanation. We derive radial gradients in O/H and N/O which agree with previous studies. Our large observational database allows us to examine the dispersion in abundances, and we find intrinsic dispersions of 0.074 ± 0.009 in O/H and 0.095 ± 0.009 in N/O (at a given radius). We stress that this measurement of the intrinsic dispersion comes exclusively from direct abundance measurements of H ii regions in NGC 5457.

NCEP ATP III dan Framingham score

OpenAIRE

Hasan, Refli; Fahila, Reny

2016-01-01

Laporan ini merupakan Program Pendidikan Kolesterol National yang diperbaharui yaitu pedoman klinis untuk melakukan pengujian kolesterol dan manajemen. ATP III dibuat berdasarkan bukti dan laporan ekstensif yang akan menjadi referensi dan rekomendasi ilmiah. Laporan ATP III dapat dijadikan pedoman untuk pemberian terapi penurun kolesterol yang intensif dalam praktek. Pedoman ini hanya sebagai informasi , tidak dapat mempengaruhi secara mutlak dalam penilaian klinis dokter yang akhirnya menent...

The Nature of the intermediates in the reactions of Fe(III)- and Mn(III)-microperoxidase-8 with H2O2 : a rapid kinetic study

NARCIS (Netherlands)

Primus, J.L.; Grunenwald, S.; Hagedoorn, P.L.; Albrecht-Gary, A.M.; Mandon, D.; Veeger, C.

2002-01-01

Kinetic studies were performed with microperoxidase-8 (Fe(III)MP-8), the proteolytic breakdown product of horse heart cytochrome c containing an octapeptide linked to an iron protoporphyrin IX. Mn(III) was substituted for Fe(III) in Mn(III)MP-8.The mechanism of formation of the reactive metal-oxo

Simulated Target Preparation and Separation of Cd (II) - In (III) Matrices Using 8-Hydroxyquinoline Reagent for Producing Indium - III Radioisotope

International Nuclear Information System (INIS)

Sunarhadijoso Soenarjo; Swasono R Tamat; Lukiyawati; Lintang Maharani

2002-01-01

The potency of production and application of 111 In in Indonesia is not supported yet by capability in required processing technology. The presented paper is a preliminary study on processing technology of 111 In production from 112 Cd target covering simulated target preparation and separation of Cd(II)-In(III) matrices. The target preparation was performed by means of electroplating of CdSO 4 solution prepared from reaction of CdO and sulphuric acid. The separation of Cd(II)-In(III) matrices was proceeded by means of solvent extraction in the presence of 8-hydroxyquinoline as In(III)-complexing agent. The Cd-electroplating deposit was satisfactorily found by using 40-60 mA currents with an electroplating time of 5-7 hours. Simulated matrix solution containing mixture of Cd(II) and In(III) was extracted into chloroform with the presence of 8-hydroxyquinoline. The chloroform phase being assumed to contain In(III)-8-hydroxyquinoline complex was then re-extracted with 1 M HCl or saline solution. Each extraction fraction was spectrophotometrically identified in the region of 200-400 nm. From the resulting absorption spectra, it can be shown that the In(III) species is selectively separated from the Cd(II)-matrix. The use of saline in the re-extraction process is better then 1 M HCl solution due to solubility of 8-hydroxyquinoline in HCl. (author)

Type III Radio Burst Duration and SEP Events

Science.gov (United States)

Gopalswamy, N.; Makela, P.; Xie, H.

2010-01-01

Long-duration (>15 min), low-frequency (25 MeV. The 1-MHz duration of the type III burst (28 rein) is near the median value of type III durations found for gradual SEP events and ground level enhancement (GLE) events. Yet, there was no sign of SEP events. On the other hand, two other type III bursts from the same active region had similar duration but accompanied by WAVES type 11 bursts; these bursts were also accompanied by SEP events detected by SOHO/ERNE. This study suggests that the type III burst duration may not be a good indicator of an SEP event, consistent with the statistical study of Cliver and Ling (2009, ApJ ).

COPMA-III - Intelligent handling of existing procedures

International Nuclear Information System (INIS)

Hulsund, John-Einar; Jung, Yeonsub; Nilsen, Svein

1999-04-01

This report describes how COPMA-III makes it possible to enhance old procedures without having to change much of their original layout. By means of COPMA-III one can insert into the old procedure text tags that describe the 'meaning' of the various textual elements in the procedure. Those tags can be made invisible to the person using the procedure, but the computer is able to inspect the tags and give appropriate assistance in carrying through the procedure. Previous versions of COPMA required a reformulation and most often a re-structuring of the procedures before taking them into use. A fixed set of instructions and a fixed procedure structure made the computerised procedure different from the original procedure (in most cases). This is no more so in COPMA-III. By means of small procedural elements (microelements), it is possible to configure the COPMA-III system to fit the set of instructions and the procedure structure that is being used in the old procedure system. This report describes an example case, starting with an old procedure, goes through a set of working steps and ends up with a procedure having exactly the same appearance as the old procedure, but having assistance from the COPMA-III system in executing the procedure (author) (ml)

Oxidation of Cr(III)-Fe(III) Mixed-phase Hydroxides by Chlorine: Implications on the Control of Hexavalent Chromium in Drinking Water.

Science.gov (United States)

Chebeir, Michelle; Liu, Haizhou

2018-05-17

The occurrence of chromium (Cr) as an inorganic contaminant in drinking water is widely reported. One source of Cr is its accumulation in iron-containing corrosion scales of drinking water distribution systems as Cr(III)-Fe(III) hydroxide, i.e., FexCr(1-x)(OH)3(s), where x represents the Fe(III) molar content and typically varies between 0.25 and 0.75. This study investigated the kinetics of inadvertent hexavalent chromium Cr(VI) formation via the oxidation of FexCr(1-x)(OH)3(s) by chlorine as a residual disinfectant in drinking water, and examined the impacts of Fe(III) content and drinking water chemical parameters including pH, bromide and bicarbonate on the rate of Cr(VI) formation. Data showed that an increase in Fe(III) molar content resulted in a significant decrease in the stoichiometric Cr(VI) yield and the rate of Cr(VI) formation, mainly due to chlorine decay induced by Fe(III) surface sites. An increase in bicarbonate enhanced the rate of Cr(VI) formation, likely due to the formation of Fe(III)-carbonato surface complexes that slowed down the scavenging reaction with chlorine. The presence of bromide significantly accelerated the oxidation of FexCr(1-x)(OH)3(s) by chlorine, resulting from the catalytic effect of bromide acting as an electron shuttle. A higher solution pH between 6 and 8.5 slowed down the oxidation of Cr(III) by chlorine. These findings suggested that the oxidative conversion of chromium-containing iron corrosion products in drinking water distribution systems can lead to the occurrence of Cr(VI) at the tap, and the abundance of iron, and a careful control of pH, bicarbonate and bromide levels can assist the control of Cr(VI) formation.

Chemical Properties And Toxicity of Chromium(III) Nutritional Supplements

Energy Technology Data Exchange (ETDEWEB)

Levina, A.; Lay, P.A.

2009-05-19

The status of Cr(III) as an essential micronutrient for humans is currently under question. No functional Cr(III)-containing biomolecules have been definitively described as yet, and accumulated experience in the use of Cr(III) nutritional supplements (such as [Cr(pic){sub 3}], where pic = 2-pyridinecarboxylato) has shown no measurable benefits for nondiabetic people. Although the use of large doses of Cr(III) supplements may lead to improvements in glucose metabolism for type 2 diabetics, there is a growing concern over the possible genotoxicity of these compounds, particularly of [Cr(pic){sub 3}]. The current perspective discusses chemical transformations of Cr(III) nutritional supplements in biological media, with implications for both beneficial and toxic actions of Cr(III) complexes, which are likely to arise from the same biochemical mechanisms, dependent on concentrations of the reactive species. These species include: (1) partial hydrolysis products of Cr(III) nutritional supplements, which are capable of binding to biological macromolecules and altering their functions; and (2) highly reactive Cr(VI/V/IV) species and organic radicals, formed in reactions of Cr(III) with biological oxidants. Low concentrations of these species are likely to cause alterations in cell signaling (including enhancement of insulin signaling) through interactions with the active centers of regulatory enzymes in the cell membrane or in the cytoplasm, while higher concentrations are likely to produce genotoxic DNA lesions in the cell nucleus. These data suggest that the potential for genotoxic side-effects of Cr(III) complexes may outweigh their possible benefits as insulin enhancers, and that recommendations for their use as either nutritional supplements or antidiabetic drugs need to be reconsidered in light of these recent findings.

Synergistic solvent extraction of Eu(III) and Tb(III) with mixtures of various organophosphorus extractants

International Nuclear Information System (INIS)

Reddy, B.V.; Reddy, L.K.; Reddy, A.S.

1994-01-01

Synergistic solvent extraction of Eu(III) and Tb(III) from thiocyanate solutions with mixtures of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPNA) and di-2-ethylhexylphosphoric acid (DEHPA) or tributyl phosphate (TBP) or trioctylphosphine oxide (TOPO) or triphenylphosphine oxide (TPhPO) in benzene has been studied. The mechanism of extraction can be explained by a simple chemically based model. The equilibrium constants of the mixed-ligand species of the various neutral donors have been determined by non-linear regression analysis. (author) 13 refs.; 9 figs.; 2 tabs

Polymeric optical sensors for selective and sensitive nitrite detection using cobalt(III) corrole and rhodium(III) porphyrin as ionophores

Energy Technology Data Exchange (ETDEWEB)

Yang, Si; Wo, Yaqi; Meyerhoff, Mark E., E-mail: mmeyerho@umich.edu

2014-09-16

Highlights: • We examine cobalt(III) corroles and rhodium(III) porphyrins as ionophores in polymeric films for optical sensors to detect nitrite. • Different types of proton chromoionophores are evaluated to optimize nitrite response. • Selectivity over lipophilic anions such as perchlorate and thiocyanate is observed. • Both ionophores yield optical sensors that are fully reversible. • The cobalt(III) corrole based sensor is employed to determine nitric oxide emission rates from NO donor doped polymers with good accuracy. - Abstract: Cobalt(III) 5,10,15-tris(4-tert-butylphenyl) corrole with a triphenylphosphine axial ligand and rhodium(III) 5,10,15,20-tetra(p-tert-butylphenyl) porphyrin are incorporated into plasticized poly(vinyl chloride) films to fabricate nitrite-selective bulk optodes via absorbance measurements. The resulting films yield sensitive, fast and fully reversible response toward nitrite with significantly enhanced nitrite selectivity over other anions including lipophilic anions such as thiocyanate and perchlorate. The selectivity patterns differ greatly from the Hofmeister series based on anion lipophilicity and are consistent with selectivity obtained with potentiometric sensors based on the same ionophores. The optical nitrite sensors are shown to be useful for detecting rates of emission of nitric oxide (NO) from NO releasing polymers containing S-nitroso-N-acetyl-DL-penicillamine.

Oxidation of Ce(III) in Foam Decontaminant by Ozone

Energy Technology Data Exchange (ETDEWEB)

Jung, Chong Hun; Yoon, I. H.; Choi, W. K.; Moon, J. K.; Yang, H. B. [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Lee, J. S. [Gachon University, Seongnam (Korea, Republic of)

2016-10-15

A nanoparticle-based foam decontaminant is composed of a surfactant and nanoparticles for the generation and maintenance of foam, and a chemical decontamination agent made of Ce(IV) dissolved in nitric acid. Ce(IV) will be reduced to Ce(III) through the decontamination process. Oxidizing cerium(III) can be reused as a decontamination agent, Ce(IV). Oxidation treatment technology by ozone uses its strong oxidizing power. It can be regarded as an environmentally friendly process, because ozone cannot be stored and transported like other industrial gases (because it quickly decays into diatomic oxygen) and must therefore be produced on site, and used ozone can decompose immediately. The ozonation treatment of Ce(III) in foam decontaminant containing a surfactant is necessary for the effective regeneration of Ce(III). Thus, the present study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) into Ce(IV) in the nanoparticle-based foam decontaminant containing surfactant. This study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) to Ce(IV) in nanoparticle-based foam decontaminant containing a TBS surfactant. The oxidation conversion rate of Ce(III) was increased with an increase in the flow rate of the gas mixture and ozone injection amount. The oxidation time required for the 100% oxidation conversion of Ce(III) to Ce(IV) at a specific ozone injection amount can be predicted from these experimental data.

Oxidation of Ce(III) in Foam Decontaminant by Ozone

International Nuclear Information System (INIS)

Jung, Chong Hun; Yoon, I. H.; Choi, W. K.; Moon, J. K.; Yang, H. B.; Lee, J. S.

2016-01-01

A nanoparticle-based foam decontaminant is composed of a surfactant and nanoparticles for the generation and maintenance of foam, and a chemical decontamination agent made of Ce(IV) dissolved in nitric acid. Ce(IV) will be reduced to Ce(III) through the decontamination process. Oxidizing cerium(III) can be reused as a decontamination agent, Ce(IV). Oxidation treatment technology by ozone uses its strong oxidizing power. It can be regarded as an environmentally friendly process, because ozone cannot be stored and transported like other industrial gases (because it quickly decays into diatomic oxygen) and must therefore be produced on site, and used ozone can decompose immediately. The ozonation treatment of Ce(III) in foam decontaminant containing a surfactant is necessary for the effective regeneration of Ce(III). Thus, the present study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) into Ce(IV) in the nanoparticle-based foam decontaminant containing surfactant. This study was undertaken to determine the optimal conditions for ozonation treatment in the regeneration of Ce(III) to Ce(IV) in nanoparticle-based foam decontaminant containing a TBS surfactant. The oxidation conversion rate of Ce(III) was increased with an increase in the flow rate of the gas mixture and ozone injection amount. The oxidation time required for the 100% oxidation conversion of Ce(III) to Ce(IV) at a specific ozone injection amount can be predicted from these experimental data

Bayley-III Cognitive and Language Scales in Preterm Children.

Science.gov (United States)

Spencer-Smith, Megan M; Spittle, Alicia J; Lee, Katherine J; Doyle, Lex W; Anderson, Peter J

2015-05-01

This study aimed to assess the sensitivity and specificity of the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III), Cognitive and Language scales at 24 months for predicting cognitive impairments in preterm children at 4 years. Children born cognitive functioning. Test norms and local term-born reference data were used to classify delay on the Bayley-III Cognitive and Language scales. Impairment on the DAS-II Global Conceptual Ability, Verbal, and Nonverbal Reasoning indices was classified relative to test norms. Scores cognitive delay on the Bayley-III for predicting impairment on DAS-II indices ranged from 29.4% to 38.5% and specificity ranged from 92.3% to 95.5%. The sensitivity of mild/moderate language delay on the Bayley-III for predicting impairment on DAS-II indices ranged from 40% to 46.7% and specificity ranged from 81.1% to 85.7%. The use of local reference data at 24 months to classify delay increased sensitivity but reduced specificity. Receiver operating curve analysis identified optimum cut-point scores for the Bayley-III that were more consistent with using local reference data than Bayley-III normative data. In our cohort of very preterm children, delay on the Bayley-III Cognitive and Language scales was not strongly predictive of future impairments. More children destined for later cognitive impairment were identified by using cut-points based on local reference data than Bayley-III norms. Copyright © 2015 by the American Academy of Pediatrics.

Light-induced reduction of rhodium(III) and palladium(II) on titanium dioxide dispersions and the selective photochemical separation and recovery of gold(III), platinum(IV), and rhodium(III) in chloride media

Energy Technology Data Exchange (ETDEWEB)

Borgarello, E.; Serpone, N.; Emo, G.; Harris, R.; Pelizzetti, E.; Minero, C.

1986-12-03

Irradiation of aqueous TiO/sub 2/ dispersions containing palladium(II) or rhodium(III) chloride salts with AM1 simulated sunlight leads to the photoreduction of these metals, which are deposited on the semiconductor particle surface. Oxygen is detrimental to the photoreduction of rhodium(III) but not the photoreduction of palladium(II). However, in both cases the reduction process is most efficient if the solution contains CH/sub 3/OH, which acts to scavenge valence band holes of the illuminated TiO/sub 2/ semiconductor. The selective photoreduction and recovery of precious metals from a dilute solution (as might be found in industrial wastes) have been investigated for a mixture of gold(III), platinum(IV), and rhodium(III) chloride salts as a function of various parameters (pH, presence or absence of O/sub 2/, presence or absence of a hole scavenger, and the concentration of the semiconductor). At pH 0, gold is easily separated from platinum and rhodium. The rate of photoreduction of gold(III) on TiO/sub 2/ is nearly independent of the concentration of the semiconductor, under the experimental conditions employed; the limiting rate is 2.7 x 10/sup -7/ M s/sup -1/. The potential utility of this selective photochemical technique is discussed.

21 CFR 864.7060 - Antithrombin III assay.

Science.gov (United States)

2010-04-01

... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Antithrombin III assay. 864.7060 Section 864.7060 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES HEMATOLOGY AND PATHOLOGY DEVICES Hematology Kits and Packages § 864.7060 Antithrombin III...

Determination of Chromium(III), Chromium(VI), and Chromium(III) acetylacetonate in water by ion-exchange disk extraction/metal furnace atomic absorption spectrometry

International Nuclear Information System (INIS)

Kamakura, Nao; Inui, Tetsuo; Kitano, Masaru; Nakamura, Toshihiro

2014-01-01

A new method for the separate determination of Chromium(III) (Cr(III)), Chromium(VI) (Cr(VI)), and Cr(III) acetylacetonate (Cr(acac) 3 ) in water was developed using a cation-exchange extraction disk (CED) and an anion-exchange extraction disk (AED) combined with metal furnace atomic absorption spectrometry (MFAAS). A 100-mL water sample was adjusted to pH 5.6 and passed through the CED placed on the AED. Cr(acac) 3 and Cr(III) were adsorbed on the CED, and Cr(VI) was adsorbed on the AED. The adsorbed Cr(acac) 3 was eluted with 50 mL of carbon tetrachloride, followed by the elution of Cr(III) with 50 mL of 3 mol L −1 nitric acid. Cr(VI) was eluted with 50 mL of 3 mol L −1 nitric acid. The chemical species of Cr eluted from the CED with carbon tetrachloride was identified as Cr(acac) 3 using infrared spectroscopy. The eluate of Cr(acac) 3 was diluted to 100 mL with carbon tetrachloride, and those of Cr(III) and Cr(VI) were diluted to 100 mL with deionized water. All of the solutions were subsequently analyzed by MFAAS. The calibration curve for the Cr(acac) 3 aqueous solutions exhibited good linearity in the range of 0.1 to 1 ng. The detection limit of Cr, which corresponded to three times the standard deviation (n = 10) of the blank values, was 20 pg. The recovery test for Cr(III), Cr(VI), and Cr(acac) 3 exhibited desirable results (96.0%–107%) when 5 μg of each species (50 μg L −1 ) was added to 100 mL water samples (i.e., tap water, rainwater, and bottled drinking water). In a humic acid solution, Cr(acac) 3 was quantitatively recovered (103%), but Cr(III) and Cr(VI) exhibited poor recoveries (i.e., 84.8% and 78.4%, respectively). - Highlights: • A determination method of Cr(III), Cr(VI), and Cr(III) acetylacetonate in water was developed. • The combination of ion-exchange resin disks with metal furnace AAS was used. • No effect of humic acid on the recovery of Cr(III) acetylacetonate was observed. • The proposed method enabled the determination

Effectively simultaneous naked-eye detection of Cu(II), Pb(II), Al(III) and Fe(III) using cyanidin extracted from red cabbage as chelating agent

Science.gov (United States)

Khaodee, Warangkhana; Aeungmaitrepirom, Wanlapa; Tuntulani, Thawatchai

Simultaneous determination of Cu(II), Pb(II), Al(III) and Fe(III) using cyanidin as a chelating agent was investigated in terms of both quantitative and qualitative detections. Cyanidin was extracted and purified from red cabbage which is a local plant in Thailand. The selectivity of this method was examined by regulating the pH of cyanidin solution operated together with masking agents. It was found that Cu(II), Pb(II), Al(III) and Fe(III) simultaneously responded with the color change at pH 7, pH 6, pH 5 and pH 4, respectively. KF, DMG and the mixture of KF and DMG were used as masking agents for the determination of Fe(III), Al(III) and Pb(II), respectively. Results from naked-eye detection were evaluated by comparing with those of inductively coupled plasma (ICP), and there was no significant difference noticed. Cyanidin using as a multianalyte reagent could be employed for simultaneous determination of Cu(II), Pb(II), Al(III) and Fe(III) at the lowest concentration at 50, 80, 50 and 200 μM, respectively, by slightly varying pHs. Moreover, the proposed method could be potentially applied for real water samples with simplicity, rapidity, low cost and environmental safety.

Improving Hybrid III injury assessment in steering wheel rim to chest impacts using responses from finite element Hybrid III and human body model.

Science.gov (United States)

Holmqvist, Kristian; Davidsson, Johan; Mendoza-Vazquez, Manuel; Rundberget, Peter; Svensson, Mats Y; Thorn, Stefan; Törnvall, Fredrik

2014-01-01

The main aim of this study was to improve the quality of injury risk assessments in steering wheel rim to chest impacts when using the Hybrid III crash test dummy in frontal heavy goods vehicle (HGV) collision tests. Correction factors for chest injury criteria were calculated as the model chest injury parameter ratios between finite element (FE) Hybrid III, evaluated in relevant load cases, and the Total Human Model for Safety (THUMS). This is proposed to be used to compensate Hybrid III measurements in crash tests where steering wheel rim to chest impacts occur. The study was conducted in an FE environment using an FE-Hybrid III model and the THUMS. Two impactor shapes were used, a circular hub and a long, thin horizontal bar. Chest impacts at velocities ranging from 3.0 to 6.0 m/s were simulated at 3 impact height levels. A ratio between FE-Hybrid III and THUMS chest injury parameters, maximum chest compression C max, and maximum viscous criterion VC max, were calculated for the different chest impact conditions to form a set of correction factors. The definition of the correction factor is based on the assumption that the response from a circular hub impact to the middle of the chest is well characterized and that injury risk measures are independent of impact height. The current limits for these chest injury criteria were used as a basis to develop correction factors that compensate for the limitations in biofidelity of the Hybrid III in steering wheel rim to chest impacts. The hub and bar impactors produced considerably higher C max and VC max responses in the THUMS compared to the FE-Hybrid III. The correction factor for the responses of the FE-Hybrid III showed that the criteria responses for the bar impactor were consistently overestimated. Ratios based on Hybrid III and THUMS responses provided correction factors for the Hybrid III responses ranging from 0.84 to 0.93. These factors can be used to estimate C max and VC max values when the Hybrid III is

Solid phase extraction of Am(III) and Cm(III) from acidic feeds using tetraethyl diglycolamide (TEDGA) in ionic liquid

NARCIS (Netherlands)

Gujar, R.B.; Ansari, S.A.; Mohapatra, P.K.; Leoncini, Andrea; Verboom, Willem

2016-01-01

Solvent extraction of Am(III) and Cm(III) with several diglycolamide ligands in an ionic liquid, [C4mim][Tf2N] was investigated from nitric acid medium. Based on the encouraging extraction behaviour with N,N,N′,N′-tetraethyldiglycolamide (TEDGA), extraction chromatographic studies were carried out

Conidiobolomicose causada por Conidiobolus lamprauges em ovinos no Estado de Santa Catarina Conidiobolomycosis caused by Conidiobolus lamprauges in sheep in the state of Santa Catarina, Brazil

Directory of Open Access Journals (Sweden)

Fernando Henrique Furlan

2010-07-01

Full Text Available Descreve-se um surto de conidiobolomicose em ovinos no Estado de Santa Catarina. O surto ocorreu entre os meses de dezembro e março de 2006, no município de Santo Amaro da Imperatriz, região litorânea do Estado. A propriedade possuía 75 ovinos da raça Santa Inês e seis desses animais adoeceram. Clinicamente os animais doentes apresentavam dificuldade respiratória, corrimento nasal seroso a mucossanguinolento e, por vezes exolftalmia. Na necropsia verificou-se uma massa amarelada na região etmoidal e adjacências que, às vezes, atingia os linfonodos regionais, cérebro, globo ocular e pleura. Microscopicamente a massa caracterizava-se por infiltrado inflamatório granulomatoso com áreas necróticas associadas a hifas largas pouco ramificadas. Através de exame molecular detectou-se DNA de Conidiobolus lamprauges. Os aspectos clínicos, epidemiológicos, macroscópicos, microscópicos e moleculares caracterizam a conidiobolomicose causada por Conidiobolus lamprauges em ovinos.An outbreak of conidiobolomycosis affecting sheep in the State of Santa Catarina, Southern Brazil is reported. The disease occurred in six Santa Inês breed sheep from a flock of 75 during the rainy season. Common clinical signs were noisy respiration and dyspnea, serous to mucosanguineous nasal discharge and exophthalmus. At necropsy there was a dense yellow mass in the nasopharyngeal area affecting the ethmoidal region, turbinate bones and occasionally limph nodes, central nervous system and pleura. Histopathologycally there was multifocal granulomas whith an eosinophilic necrotic reaction containing ribbon type hyphae similar to zygomycetous fungi. At molecular examination Conidiobolus lamprauges DNA was detected. The clinical, epidemiological, macroscopical, microscopical and molecular aspects characterize conidiobolomycosis caused by Conidiobolus lamprauges in sheep.

25 CFR 522.12 - Revocation of class III gaming.

Science.gov (United States)

2010-04-01

... 25 Indians 2 2010-04-01 2010-04-01 false Revocation of class III gaming. 522.12 Section 522.12 Indians NATIONAL INDIAN GAMING COMMISSION, DEPARTMENT OF THE INTERIOR APPROVAL OF CLASS II AND CLASS III ORDINANCES AND RESOLUTIONS SUBMISSION OF GAMING ORDINANCE OR RESOLUTION § 522.12 Revocation of class III...

Pangad õhutavad III pensionisambaga liituma / Toivo Tänavsuu

Index Scriptorium Estoniae

Tänavsuu, Toivo

2004-01-01

Pangad peavad III pensionisambaga liitumist hädavajalikuks neile, kes soovivad oma elustandardit pensionile minnes säilitada. Pankade prognoose III sambaga liitumise kohta käesolevaks aastaks. Lisa: Pensioniks kogumine

Determination of antithrombin III by radioimmunoassay and its clinical application

Energy Technology Data Exchange (ETDEWEB)

Chan, V; Chan, T K; Wong, V; Tso, S G; Todd, D [Queen Mary Hospital, Hong Kong

1979-04-01

A radioimmunoassay (RIA) has been developed for the determination of antithrombin III (AT III) in man. The detection limit was 25 ..mu..g/dl. At III-RIA level and biological activity (anti-Xa) was significantly correlated (r = 0.737, P < 0.0001). Plasma levels in 36 healthy males (mean +- SD, 19.9 +- 2.5 mg/dl) and 21 healthy females (19.1 +- 2.4 mg/dl) were similiar. Serial AT III measurements in normal menstruating females showed lower levels during midcycle and higher concentrations during menstruation. In carcinomas, the AT III levels were lower than normal, particularly in hepatocellular carcinoma. In cirrhosis of liver, the levels were markedly decreased and in some patients were below that found in congenital AT III deficiency. Patients with deep vein thrombosis and patients with heart valve replacement had lower levels than normal, while patients with cerebral vascular occlusion had normal levels. The possible use of AT III as a diagnostic tool of post-operative deep vein thrombosis was demonstrated in one patient after hysterectomy. The increased sensitivity, specificity and precision of this type of assay offer distinct advantages over existing methods of AT III estimation.

Transformational III-V Electronics

KAUST Repository

Nour, Maha A.

2014-01-01

Flexible electronics using III-V materials for nano-electronics with high electron mobility and optoelectronics with direct band gap are attractive for many applications. This thesis describes a complementary metal oxide semiconductor (CMOS

REGIOSELECTIVE OXIDATIONS OF EQUILENIN DERIVATIVES CATALYZED BY A RHODIUM (III) PORPHYRIN COMPLEX-CONTRAST WITH THE MANGANESE (III) PORPHYRIN. (R826653)

Science.gov (United States)

AbstractEquilenin acetate and dihydroequilenin acetate were oxidized with iodosobenzene and a rhodium(III) porphyrin catalyst. The selectivity of the reactions differs from that with the corresponding Mn(III) catalyst, or from that of free radical chain oxidation.

Prediction of ROSA-III experiment

International Nuclear Information System (INIS)

Soda, Kunihisa

1978-06-01

ROSA-III experiment with the simulated BWR system is to investigate thermal hydraulic behavior as well as ECCS performance in a postulated loss-of-coolant accident. RUN 701 assumes average core power, high and low pressure core sprays and low pressure injection of ECCS. Prediction of experiment RUN 701 was made with computer code RELAP-4J. The results indicate the need for ROSA-III pump characteristics to be clarified and for liquid level formation model to be improved. Comparison of the prediction results with the experimental data should reveal the areas of modifications in calculation model. (auth.)

Streptococcus pneumoniae aislados durante 2002-2006: serotipos y resistencia antibiótica. Correlación con las vacunas existentes

Directory of Open Access Journals (Sweden)

José María Guevara-Duncan

2008-03-01

Full Text Available Objetivos: Identificar los serotipos de S. pneumoniae aislados, correlacionándolos con los incluidos en las vacunas existentes y su resistencia antimicrobiana. Diseño: Estudio descriptivo, observacional y longitudinal. Lugar: Instituto de Medicina Tropical Daniel A. Carrión, Facultad de Medicina, UNMSM. Material biológico: Cepas de Streptococcus pneumoniae. Intervenciones: Cuarenta Streptococcus pneumoniae de nuestro cepario, aislados entre el 2002 y 2006, fueron serotipificados en el Instituto de Salud Carlos III en Madrid -España; 15 fueron invasivos, 11 aislados de infecciones localizadas, 6 de portadores y 8 eran multiresistentes. Principales medidas de resultados: Protección de las vacunas existentes en nuestro medio a las infecciones causadas por Streptococcus pneumoniae. Resultados: Hubo 14 serotipos diferentes y los serogrupos más identificados fueron 23, 19 y 6. El 28,6% estaba contenido en la vacuna 7-valente, 42,9% en la 9-valente, 50% en la 11-valente y el 71,4% en la 23-valente; 57,5% fue resistente a la penicilina y 30% a eritromicina. El grupo de Streptococcus invasivo resultó más sensible a los antibióticos que los otros grupos. Los serotipos asociados a multirresistencia fueron 19F y 23F. Conclusiones: Ninguna de las vacunas protege a todas las infecciones causadas por Streptococcus pneumoniae, en nuestro medio.

On the uniqueness of the injective III1 factor

DEFF Research Database (Denmark)

Haagerup, U.

2016-01-01

We give a new proof of a theorem due to Alain Connes, that an injective factor N of type III1 with separable predual and with trivial bicentralizer is isomorphic to the Araki-Woods type III1 factor R∞. This, combined with the author's solution to the bicentralizer problem for injective III1 facto...

Oxidation of Dodecanoate Intercalated Iron(II)–Iron(III) Layered Double Hydroxide to Form 2D Iron(III) (Hydr)oxide Layers

DEFF Research Database (Denmark)

Huang, Li‐Zhi; Ayala‐Luis, Karina B.; Fang, Liping

2013-01-01

hydroxide planar layer were preserved during the oxidation, as shown by FTIR spectroscopy. The high positive charge in the hydroxide layer produced by the oxidation of iron(II) to iron(III) is partially compensated by the deprotonation of hydroxy groups, as shown by X‐ray photoelectron spectroscopy...... between the alkyl chains of the intercalated dodecanoate anions play a crucial role in stabilizing the structure and hindering the collapse of the iron(II)–iron(III) (hydr)oxide structure during oxidation. This is the first report describing the formation of a stable planar layered octahedral iron......(III) (hydr)oxide. oxGRC12 shows promise as a sorbent and host for hydrophobic reagents, and as a possible source of single planar layers of iron(III) (hydr)oxide....

Mastite subclínica causada por Staphylococcus aureus: custo-benefício da antibioticoterapia de vacas em lactação Subclinical mastitis caused by Staphylococcus aureus: cost benefit analysis of antibiotic therapy in lactating cows

Directory of Open Access Journals (Sweden)

L.F. Zafalon

2007-06-01

Full Text Available Avaliou-se a relação custo-benefício do tratamento da mastite subclínica bovina causada por Staphylococcus aureus. Foram selecionados 270 quartos mamários com mastite subclínica e sadios, divididos em quatro grupos de acordo com o estádio de lactação e o tratamento. O grupo 1 foi formado por animais entre 10 e 60 dias da lactação e tratados contra mastites; o grupo 2 incluiu animais entre 61 dias da lactação e dois meses antes da secagem e tratados contra mastite; o grupo 3 foi formado por animais entre 10 e 60 dias da lactação, não tratados contra mastite; e o grupo 4 foi formado por animais entre 61 dias em lactação e dois meses antes da secagem, não tratados. O tratamento foi realizado pela infusão intramamária de 150mg de gentamicina, uma vez ao dia. A reavaliação foi efetuada após 30 dias. Para os cálculos dos custos com o tratamento, foram considerados uma prevalência de S. aureus de 5% e os gastos com medicamento, descarte do leite, antibiograma e mão-de-obra. Observou-se redução de 2% e 14% das receitas nos grupos 1 e 2, respectivamente, quando comparada com as receitas obtidas antes do tratamento, demonstrando ser economicamente inviável o tratamento da mastite subclínica bovina causada por S. aureus, durante a lactação.Economic evaluation of the treatment bovine subclinical mastitis caused by S. aureus was evaluated. Two hundred and seventy udder quarters with or without subclinical mastitis were distributed into four groups, in conformity to lactational stage and treatments. Group 1 included animals treated between 10 and 60 days of lactation; group 2 included animals treated from 61 days of lactation to two months before drying; group 3 included animals no treated between 10 and 60 days of lactation; group 4 included animals no treated from 61 days of lactation to two months before drying. Treatment with gentamicin (150mg was accomplished by intramammary doses, once a day, after performing sensitivity

Redox behavior of Ce(IV)/Ce(III) in the presence of nitrilotriacetic acid: a surrogate study for An(IV)/An(III) redox behavior

International Nuclear Information System (INIS)

Suzuki, Y.; Nankawa, T.; Ohnuki, T.; Francis, A.J.

2010-01-01

Using cyclic voltammetry, we investigated the redox behavior of Ce(IV)/Ce(III), which is a surrogate for An(IV)/An(III) (An = actinides), in a solution of nitrilotriacetic acid (NTA) at 25 C. The cyclic voltammogram of Ce in a 0.1 M NTA solution at pH 6 showed a reversible one-electron redox reaction for Ce(IV)/Ce(III) at 0.51 V vs. Ag/AgCl. This redox potential was much lower than that obtained in 1 M nitric acid, indicating that Ce(IV) was preferentially stabilized by complexation with NTA. The redox potential in the NTA solution was independent of the Ce concentration from 2 to 20 mM, NTA concentration from 5 to 200 mM and pH between 3 and 7. These results indicated that no polymerization and no additional coordination of NTA and OH to the Ce(III)-NTA complex took place during the redox reaction. As the speciation calculation of Ce(III) in the NTA solution showed that the predominant species was Ce III (nta) 2 3 (H 3 nta = NTA), the redox reaction of the Ce-NTA complex was expressed by the following: Ce IV (nta) 2 2- + e - ↔ Ce III (nta) 2 3 . The logarithm of the stability constant of Ce IV (nta) 2 2- was calculated to be 38.6 ± 0.8 for I = 0 from the redox potential shift of Ce(IV)/Ce(III) in the NTA solution. The value was in good accordance with the stability constant of the Np IV (nta) 2 2- complex, demonstrating that the aqueous coordination chemistry of Ce(IV) with NTA is quite similar to that of An(IV). These results strongly suggest that a negative shift of the Pu(IV)/Pu(III) redox potential in the NTA solution should make Pu(IV) more stable than Pu(III) even in a reducing environment. (orig.)

NNDSS - Table III. Tuberculosis

Data.gov (United States)

U.S. Department of Health & Human Services — NNDSS - Table III. Tuberculosis - 2017.This Table includes total number of cases reported in the United States, by region and by states, in accordance with the...

NNDSS - Table III. Tuberculosis

Data.gov (United States)

U.S. Department of Health & Human Services — NNDSS - Table III. Tuberculosis - 2018.This Table includes total number of cases reported in the United States, by region and by states, in accordance with the...

Perawatan Maloklusi Pseudo Kelas III dengan Alat Ortodontik Cekat Teknik Begg

Directory of Open Access Journals (Sweden)

Robertus Meidiyanto

2016-10-01

Full Text Available Latar Belakang: Maloklusi Pseudo kelas III ditandai dengan hubungan yang tidak harmonis antara relasi anteroposterior rahang dan posisi mandibula terhadap maksila. Ketidakharmonisan tersebut dapat disebabkan karena mandibula yang normal dengan maksila retrusif. Maloklusi pseudo kelas III mempunyai perhitungan yang menunjukkan bentuk antara klas I dan skeletal klas III. Perbedaanya hanya pada sudut gonial dimana pada skeletal klas III sudutnya lebih tumpul, sedangkan pada sampel pseudo klas III, sudut gonial lebih mirip dengan klas I. Perawatan ortodontik dengan alat cekat teknik Begg dapat juga untuk merawat maloklusi Angle kelas III, termasuk maloklusi skeletal yang menyertainya. Tujuan: memaparkan perubahan dental dan skeletal setelah perawatan dengan alat cekat teknik Begg. Kasus: perempuan 20 tahun mengeluhkan gigi-gigi rahang atas ada yang tumbuh di belakang dan rahang bawah nyakil sehingga menganggu penampilan dan mengurangi rasa percaya diri. Diagnosis: Maloklusi Angle Klas III subdivisi serta hubungan skeletal klas III dengan maksila retrusif dan mandibula protusif disertai Crossbite: 12, 11, 21, 22 terhadap 34, 32,31, 41, 42, 43. Perawatan: menggunakan alat cekat teknik Begg tanpa pencabutan. Kesimpulan: Hasil menunjukkan crowded terkoreksi, overjet dan overbite terkoreksi, relasi molar menjadi klas I.   Background: Pseudo class III malocclusion characterized by disharmony between anteroposterior relationship of jaw and mandibulae position toward maxilla. This disharmony cause by normally shaped mandibles and underveloped maxillae. Pseudo clas III malocclusion is an intermediate form between class I and skeletal clas III malocclusion. The only exception was the gonial angle, which was generally more obtuse in the skeletal class III sample. Measurement of gonial angle in the pseudo class III sample was found to be rather similar to class I sample. Fixed Begg orthodontic appliance can be used to treat Angle’s class III malocclusion

Human immune responsiveness to Lolium perenne pollen allergen Lol p III (rye III) is associated with HLA-DR3 and DR5.

Science.gov (United States)

Ansari, A A; Freidhoff, L R; Meyers, D A; Bias, W B; Marsh, D G

1989-05-01

A well-characterized allergen of Lolium perenne (perennial rye grass) pollen, Lol p III, has been used as a model antigen to study the genetic control of the human immune response. Associations between HLA type and IgE or IgG antibody (Ab) responsiveness to Lol p III were studied in two groups of skin-test-positive Caucasoid adults (N = 135 and 67). We found by nonparametric and parametric analyses that immune responsiveness to Lol p III was significantly associated with HLA-DR3 and DR5. No association was found between any DQ type and immune responsiveness to Lol p III. Geometric mean IgE or IgG Ab levels to Lol p III were not different between B8+, DR3+ subjects and B8-, DR3+ subjects, showing that HLA-B8 had no influence on the association. Lol p III IgG Ab data obtained on subjects after grass antigen immunotherapy showed that 100% of DR3 subjects and 100% of DR5 subjects were Ab+. A comparison of all the available protein sequences of DRB gene products showed that the first hypervariable region of DR3 and DR5 (and DRw6), and no other region, contains the sequence Glu9-Tyr-Ser-Thr-Ser13. Our observations are consistent with the possibility that immune responsiveness to the allergen Lol p III is associated with this amino acid sequence in the first hypervariable region of the DR beta 1 polypeptide chain.

WISC-III e WAIS-III na avaliação da inteligência de cegos

OpenAIRE

Nascimento, Elizabeth do; Flores-Mendoza, Carmen Elvira

2007-01-01

Diante da escassez de pesquisas nacionais e de testes psicológicos destinados a avaliar pessoas cegas, desenvolveu-se um estudo psicométrico com as escalas verbais dos testes WISC-III e WAIS-III. Após as adaptações de alguns estímulos e das instruções, os testes foram aplicados em crianças (N = 120) e adultos (N = 52) residentes em Belo Horizonte. Os resultados indicaram que as escalas verbais modificadas apresentam uma boa consistência interna (alfa> 0,80). Além disso, a investigação da vali...

Alpha Radiolysis of Nuclear Solvent Extraction Ligands Used for An(III) and Ln(III) Separations

Energy Technology Data Exchange (ETDEWEB)

Mezyk, Stephen P. [California State Univ. (CalState), Long Beach, CA (United States); Mincher, Bruce J. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Nilsson, Mikael [Univ. of California, Irvine, CA (United States)

2016-08-01

This document is the final report for the Nuclear Energy Universities Program (NEUP) grant 10-910 (DE-AC07-05ID14517) “Alpha Radiolysis of Nuclear Solvent Extraction Ligands used for An(III) and Ln(III) Separations”. The goal of this work was to obtain a quantitative understanding of the impacts of both low Linear Energy Transfer (LET, gamma-rays) and high LET (alpha particles) radiation chemistry occurring in future large-scale separations processes. This quantitative understanding of the major radiation effects on diluents and ligands is essential for optimal process implementation, and could result in significant cost savings in the future.

Spectral intensities and bonding parameters for some praseodymium(III) and neodymium(III) complexes with benzimidazoles

Energy Technology Data Exchange (ETDEWEB)

Vyas, P C; Ojha, C K; Mittal, S; Joshi, G K

1988-09-01

The electronic spectral intensity parameters (Judd-Ofelt; Tsub(lambda)) calculated from absorption spectral data for the complexes of praseodymium(III) and neodymium(III) nitrates with benzimidazole and 2-methyl-, 2-ethyl- and 2-n-propyl-benzimidazoles are reported. The conductance of these derivatives in dimethylformamide suggests 1:1 electrolytic nature. The infrared spectral data indicate the presence of Csub(2v) as well Dsub(2h)-nitrate ions in the complexes. The correlation of the intensity of hypersensitive transitions with bonding (nephelauxetic ratio and degree of covalency) parameters are also reported. (author). 13 refs., 2 tables.

Dissociation kinetics of Fe(III)- and Al(III)-natural organic matter complexes at pH 6.0 and 8.0 and 25 °C

Science.gov (United States)

Jones, Adele M.; Pham, A. Ninh; Collins, Richard N.; Waite, T. David

2009-05-01

The rate at which iron- and aluminium-natural organic matter (NOM) complexes dissociate plays a critical role in the transport of these elements given the readiness with which they hydrolyse and precipitate. Despite this, there have only been a few reliable studies on the dissociation kinetics of these complexes suggesting half-times of some hours for the dissociation of Fe(III) and Al(III) from a strongly binding component of NOM. First-order dissociation rate constants are re-evaluated here at pH 6.0 and 8.0 and 25 °C using both cation exchange resin and competing ligand methods for Fe(III) and a cation exchange resin method only for Al(III) complexes. Both methods provide similar results at a particular pH with a two-ligand model accounting satisfactorily for the dissociation kinetics results obtained. For Fe(III), half-times on the order of 6-7 h were obtained for dissociation of the strong component and 4-5 min for dissociation of the weak component. For aluminium, the half-times were on the order of 1.5 h and 1-2 min for the strong and weak components, respectively. Overall, Fe(III) complexes with NOM are more stable than analogous complexes with Al(III), implying Fe(III) may be transported further from its source upon dilution and dispersion.

Chemistry of organogold compounds I. Syntheses and properties of dihalogold(III) N,N-dialkyldithiocarbamates and dialkylgold(III) N,N-dialkyldithiocarbamates

NARCIS (Netherlands)

Blaauw, H.J.A.; Nivard, R.J.F.; Kerk, G.J.M. van der

Monomeric dialkylgold(III) N,N-dialkyldithiocarbamates (R2AuSSCNR'2) can be prepared in good yields from monomeric dibromogold(III) N,N-dialkyldithiocarbamates (Br2AuSSCNR'2) and alkylmagnesium halides or dialkylcadmium compounds. In addition N-ethylpiperidinium tetrachloroaurate can be converted

Uranium (III) precipitation in molten chloride by wet argon sparging

Energy Technology Data Exchange (ETDEWEB)

Vigier, Jean-François, E-mail: jean-francois.vigier@ec.europa.eu [CEA, Nuclear Energy Division, Radiochemistry & Processes Department, F-30207 Bagnols sur Cèze (France); Unité de Catalyse et de Chimie du Solide, UCCS UMR CNRS 8181, Univ. Lille Nord de France, ENSCL-USTL, B.P. 90108, 59652 Villeneuve d' Ascq Cedex (France); Laplace, Annabelle [CEA, Nuclear Energy Division, Radiochemistry & Processes Department, F-30207 Bagnols sur Cèze (France); Renard, Catherine [Unité de Catalyse et de Chimie du Solide, UCCS UMR CNRS 8181, Univ. Lille Nord de France, ENSCL-USTL, B.P. 90108, 59652 Villeneuve d' Ascq Cedex (France); Miguirditchian, Manuel [CEA, Nuclear Energy Division, Radiochemistry & Processes Department, F-30207 Bagnols sur Cèze (France); Abraham, Francis [Unité de Catalyse et de Chimie du Solide, UCCS UMR CNRS 8181, Univ. Lille Nord de France, ENSCL-USTL, B.P. 90108, 59652 Villeneuve d' Ascq Cedex (France)

2016-06-15

In the context of pyrochemical processes for nuclear fuel treatment, the precipitation of uranium (III) in molten salt LiCl-CaCl{sub 2} (30–70 mol%) at 705 °C is studied. First, this molten chloride is characterized with the determination of the water dissociation constant. With a value of 10{sup −4.0}, the salt has oxoacid properties. Then, the uranium (III) precipitation using wet argon sparging is studied. The salt is prepared using UCl{sub 3} precursor. At the end of the precipitation, the salt is totally free of solubilized uranium. The main part is converted into UO{sub 2} powder but some uranium is lost during the process due to the volatility of uranium chloride. The main impurity of the resulting powder is calcium. The consequences of oxidative and reductive conditions on precipitation are studied. Finally, coprecipitation of uranium (III) and neodymium (III) is studied, showing a higher sensitivity of uranium (III) than neodymium (III) to precipitation. - Highlights: • Precipitation of Uranium (III) is quantitative in molten salt LiCl-CaCl{sub 2} (30–70 mol%). • The salt is oxoacid with a water dissociation constant of 10{sup −4.0} at 705 °C. • Volatility of uranium chloride is strongly reduced in reductive conditions. • Coprecipitation of U(III) and Nd(III) leads to a consecutive precipitation of the two elements.

Workshop 96. Part III

Energy Technology Data Exchange (ETDEWEB)

NONE

1996-12-31

Part III of the proceedings contain 155 contributions in various fields of science and technology including nuclear engineering, environmental science, and biomedical engineering. Out of these, 10 were selected to be inputted in INIS. (P.A.).

Workshop 96. Part III

International Nuclear Information System (INIS)

1995-12-01

Part III of the proceedings contain 155 contributions in various fields of science and technology including nuclear engineering, environmental science, and biomedical engineering. Out of these, 10 were selected to be inputted in INIS. (P.A.)

Electrical properties of dislocations in III-Nitrides

Energy Technology Data Exchange (ETDEWEB)

Cavalcoli, D.; Minj, A.; Pandey, S.; Cavallini, A. [Physics and Astronomy Dept. University of Bologna, Italy viale C Berti Pichat 6/II, Bologna (Italy)

2014-02-21

Research on GaN, AlN, InN (III-N) and their alloys is achieving new heights due their high potential applications in photonics and electronics. III-N semiconductors are mostly grown epitaxially on sapphire, and due to the large lattice mismatch and the differences in the thermal expansion coefficients, the structures usually contain many threading dislocations (TDs). While their structural properties have been widely investigated, their electrical characteristics and their role in the transport properties of the devices are still debated. In the present contribution we will show conductive AFM studies of TDs in GaN and Al/In GaN ternary alloys to evidence the role of strain, different surface polarity and composition on their electrical properties. Local I-V curves measured at TDs allowed us to clarify their role in the macroscopic electrical properties (leakage current, mobilities) of III-N based devices. Samples obtained by different growers (AIXTRON, III-V Lab) were studied. The comparison between the results obtained in the different alloys allowed us to understand the role of In and Al on the TDs electrical properties.

Electrical properties of dislocations in III-Nitrides

Science.gov (United States)

Cavalcoli, D.; Minj, A.; Pandey, S.; Cavallini, A.

2014-02-01

Research on GaN, AlN, InN (III-N) and their alloys is achieving new heights due their high potential applications in photonics and electronics. III-N semiconductors are mostly grown epitaxially on sapphire, and due to the large lattice mismatch and the differences in the thermal expansion coefficients, the structures usually contain many threading dislocations (TDs). While their structural properties have been widely investigated, their electrical characteristics and their role in the transport properties of the devices are still debated. In the present contribution we will show conductive AFM studies of TDs in GaN and Al/In GaN ternary alloys to evidence the role of strain, different surface polarity and composition on their electrical properties. Local I-V curves measured at TDs allowed us to clarify their role in the macroscopic electrical properties (leakage current, mobilities) of III-N based devices. Samples obtained by different growers (AIXTRON, III-V Lab) were studied. The comparison between the results obtained in the different alloys allowed us to understand the role of In and Al on the TDs electrical properties.

Constraining the Statistics of Population III Binaries

Science.gov (United States)

Stacy, Athena; Bromm, Volker

2012-01-01

We perform a cosmological simulation in order to model the growth and evolution of Population III (Pop III) stellar systems in a range of host minihalo environments. A Pop III multiple system forms in each of the ten minihaloes, and the overall mass function is top-heavy compared to the currently observed initial mass function in the Milky Way. Using a sink particle to represent each growing protostar, we examine the binary characteristics of the multiple systems, resolving orbits on scales as small as 20 AU. We find a binary fraction of approx. 36, with semi-major axes as large as 3000 AU. The distribution of orbital periods is slightly peaked at approx. < 900 yr, while the distribution of mass ratios is relatively flat. Of all sink particles formed within the ten minihaloes, approx. 50 are lost to mergers with larger sinks, and 50 of the remaining sinks are ejected from their star-forming disks. The large binary fraction may have important implications for Pop III evolution and nucleosynthesis, as well as the final fate of the first stars.

75 FR 76636 - Anthropomorphic Test Devices; Hybrid III 6-Year-Old Child Test Dummy, Hybrid III 6-Year-Old...

Science.gov (United States)

2010-12-09

... provision: ``When a motor vehicle safety standard is in effect under this chapter, a State or a political... [Docket No. NHTSA-2010-0147] RIN 2127-AK34 Anthropomorphic Test Devices; Hybrid III 6-Year-Old Child Test Dummy, Hybrid III 6-Year-Old Weighted Child Test Dummy AGENCY: National Highway Traffic Safety...

Position-controlled epitaxial III-V nanowires on silicon

Energy Technology Data Exchange (ETDEWEB)

Roest, Aarnoud L; Verheijen, Marcel A; Wunnicke, Olaf; Serafin, Stacey; Wondergem, Harry; Bakkers, Erik P A M [Philips Research Laboratories, Professor Holstlaan 4, 5656 AA Eindhoven (Netherlands); Kavli Institute of NanoScience, Delft University of Technology, PO Box 5046, 2600 GA Delft (Netherlands)

2006-06-14

We show the epitaxial integration of III-V semiconductor nanowires with silicon technology. The wires are grown by the VLS mechanism with laser ablation as well as metal-organic vapour phase epitaxy. The hetero-epitaxial growth of the III-V nanowires on silicon was confirmed with x-ray diffraction pole figures and cross-sectional transmission electron microscopy. We show preliminary results of two-terminal electrical measurements of III-V nanowires grown on silicon. E-beam lithography was used to predefine the position of the nanowires.

Position-controlled epitaxial III-V nanowires on silicon

International Nuclear Information System (INIS)

Roest, Aarnoud L; Verheijen, Marcel A; Wunnicke, Olaf; Serafin, Stacey; Wondergem, Harry; Bakkers, Erik P A M

2006-01-01

We show the epitaxial integration of III-V semiconductor nanowires with silicon technology. The wires are grown by the VLS mechanism with laser ablation as well as metal-organic vapour phase epitaxy. The hetero-epitaxial growth of the III-V nanowires on silicon was confirmed with x-ray diffraction pole figures and cross-sectional transmission electron microscopy. We show preliminary results of two-terminal electrical measurements of III-V nanowires grown on silicon. E-beam lithography was used to predefine the position of the nanowires

Space Shuttle dosimetry measurements with RME-III

International Nuclear Information System (INIS)

Hardy, K.A.; Golightly, M.J.; Hardy, A.C.; Atwell, W.; Quam, W.

1991-10-01

A description of the radiation monitoring equipment (RME-III) dosimetry instrument and the results obtained from six Space Shuttle flights are presented. The RME-III is a self-contained, active (real-time), portable dosimeter system developed for the USAF and adapted for utilization in measuring the ionizing radiation environment on the Space Shuttle. This instrument was developed to incorporate the capabilities of two earlier radiation instruments into a single unit and to minimize crew interaction times with longer battery life and expanded memory capacity. Flight data has demonstrated that the RME-III can be used to accurately assess dose from various sources of exposure, such as that encountered in the complex radiation environment of space

Reporting of the translation and cultural adaptation procedures of the Addenbrooke's Cognitive Examination version III (ACE-III) and its predecessors: a systematic review.

Science.gov (United States)

Mirza, Nadine; Panagioti, Maria; Waheed, Muhammad Wali; Waheed, Waquas

2017-09-13

The ACE-III, a gold standard for screening cognitive impairment, is restricted by language and culture, with no uniform set of guidelines for its adaptation. To develop guidelines a compilation of all the adaptation procedures undertaken by adapters of the ACE-III and its predecessors is needed. We searched EMBASE, Medline and PsychINFO and screened publications from a previous review. We included publications on adapted versions of the ACE-III and its predecessors, extracting translation and cultural adaptation procedures and assessing their quality. We deemed 32 papers suitable for analysis. 7 translation steps were identified and we determined which items of the ACE-III are culturally dependent. This review lists all adaptations of the ACE, ACE-R and ACE-III, rates the reporting of their adaptation procedures and summarises adaptation procedures into steps that can be undertaken by adapters.

The role of the enzyme alpha-amylase in binding of An(III)/Ln(III) by oral ingestion

Energy Technology Data Exchange (ETDEWEB)

Barkleit, A.; Bernhard, G. [Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany); Division of Radiochemistry and Resource Ecology, Technische Universitaet Dresden, 01062 Dresden (Germany); Heller, A. [Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany)

2014-07-01

In case of incorporation, radionuclides represent a serious health risk to humans due to their (radio-)toxicity. Thus, the determination of their speciation and transport on a molecular level is crucial for the understanding of the transport, metabolism, deposition and elimination in the human organisms. In case of oral ingestion of contaminated food or radioactive substances the first contact medium in the mouth is the aqueous bio-fluid saliva which contains inorganic ions (mainly Na{sup +}, K{sup +}, Ca{sup 2+}, Cl{sup -}, CO{sub 3}{sup 2-}, PO{sub 4}{sup 3-}) and numerous biomolecules, mainly proteins. One of the major proteins in saliva is the digestive enzyme α-amylase which catalyzes the hydrolysis of the α-1,4 glycosidic linkages of polysaccharides like starch or glycogen. [1] In this study the speciation of curium(III) and europium(III) in saliva as the first contact medium at oral incorporation was investigated with time-resolved laser-induced fluorescence spectroscopy (TRLFS). For TRLFS measurements, fresh saliva samples from human sources have been spiked in vitro with Eu(III) or Cm(III). The identification of the dominant species was achieved by a comparison of the spectroscopic data with reference spectra obtained from synthetic saliva and the main single components of the bio-fluid. In the pH range from 6.8 to 7.4 similar spectra were obtained. With respect to reference data, the spectra indicate the formation of a ternary metal complex containing phosphate and carbonate anions and, in addition, a coordination of organic matter, namely α-amylase, to the central metal cation is suggested. To get more information about the binding behavior of α-amylase various investigations with Eu(III) as inactive analog for An(III) were carried out with porcine pancreatic α-amylase (PPA) which serves as model system for various α-amylase species. Sorption experiments showed a high affinity of Eu(III) to α-amylase in a wide pH range, namely between pH 4 and 8

Towards an interpretation of the mechanism of the actinides(III)/lanthanides(III) separation by synergistic solvent extraction with nitrogen-containing polydendate ligands; Vers une interpretation des mecanismes de la separation actinides(III)/lanthanides(III) par extraction liquide-liquide synergique impliquant des ligands polyazotes

Energy Technology Data Exchange (ETDEWEB)

Francois, N [CEA/VALRHO - site de Marcoule, Dept. de Recherche en Retraitement et en Vitrification, (DRRV), 30 - Marcoule (France); Universite Henri Poincare, 54 - Vandoeuvre-les-Nancy (France)

2000-07-01

In the field of the separation of long-lived radionuclides from the wastes produced by nuclear fuel reprocessing, aromatic nitrogen-containing polydendate ligands are potential candidates for the selective extraction, alone or in synergistic mixture with acidic extractants, of trivalent actinides from trivalent lanthanides. The first part of this work deals with the complexation of trivalent f cations with various nitrogen-containing ligands (poly-pyridine analogues). Time-resolved laser-induced fluorimetry (TRLIF) and UV-visible spectrophotometry were used to determine the nature and evaluate the stability of each complex. Among the ligands studied, the least basic Me-Btp proved to be highly selective towards americium(III) in acidic solution. In the second part, two synergistic systems (nitrogen-containing polydendate ligand and lipophilic carboxylic acid) are studied and compared in regard to the extraction and separation of lanthanides(III) and actinides(III). TRLIF and gamma spectrometry allowed the nature of the extracted complexes and the optimal conditions of efficiency of both systems to be determined. Comparison between these different studies showed that the selectivity of complexation of trivalent f cations by a given nitrogen-containing polydendate ligand could not always be linked to the Am(III)Eu(III) selectivity reached in synergistic extraction. The latter depends on the 'balance' between the acid-basic properties on the one hand, and on the hard-soft characteristics on the other hand, of both components of synergistic system. (author)

Towards an interpretation of the mechanism of the actinides(III)/lanthanides(III) separation by synergistic solvent extraction with nitrogen-containing polydendate ligands; Vers une interpretation des mecanismes de la separation actinides(III)/lanthanides(III) par extraction liquide-liquide synergique impliquant des ligands polyazotes

Energy Technology Data Exchange (ETDEWEB)

Francois, N. [CEA/VALRHO - site de Marcoule, Dept. de Recherche en Retraitement et en Vitrification, (DRRV), 30 - Marcoule (France); Universite Henri Poincare, 54 - Vandoeuvre-les-Nancy (France)

2000-07-01

In the field of the separation of long-lived radionuclides from the wastes produced by nuclear fuel reprocessing, aromatic nitrogen-containing polydendate ligands are potential candidates for the selective extraction, alone or in synergistic mixture with acidic extractants, of trivalent actinides from trivalent lanthanides. The first part of this work deals with the complexation of trivalent f cations with various nitrogen-containing ligands (poly-pyridine analogues). Time-resolved laser-induced fluorimetry (TRLIF) and UV-visible spectrophotometry were used to determine the nature and evaluate the stability of each complex. Among the ligands studied, the least basic Me-Btp proved to be highly selective towards americium(III) in acidic solution. In the second part, two synergistic systems (nitrogen-containing polydendate ligand and lipophilic carboxylic acid) are studied and compared in regard to the extraction and separation of lanthanides(III) and actinides(III). TRLIF and gamma spectrometry allowed the nature of the extracted complexes and the optimal conditions of efficiency of both systems to be determined. Comparison between these different studies showed that the selectivity of complexation of trivalent f cations by a given nitrogen-containing polydendate ligand could not always be linked to the Am(III)Eu(III) selectivity reached in synergistic extraction. The latter depends on the 'balance' between the acid-basic properties on the one hand, and on the hard-soft characteristics on the other hand, of both components of synergistic system. (author)

DIAGNOSTIC GUIDANCE AND EARLY INTERVENTION IN CLASS III MALOCCLUSION

Directory of Open Access Journals (Sweden)

Rinandri Charea Runizar

2015-06-01

Full Text Available Timing of orthodontic treatment for Class III malocclusion has always been somewhat controversial. Many orthodontic pioneers like Angle, Tweed, and Graber have advocated early interception of class II malocclusion because this kind of skeletal discrepancy once established, would usually progress rapidly. What kind of early treatment would be appropriate for this malocclusion? Would this approach be effective and promises a stable result? Early orthodontic treatment is defined as a treatment that is initiated during the primary or mixed dentition stage to enhance skeletal and dental development. It is usually done in two phases. The first phase is intended to correct skeletal discrepancy by taking advantage of growth and development period. The second phase followed to improve occlusal relationship. Early treatment of Class III malocclusion is a possible alternative to improve skeletal discrepancy or at the very east may serve to prevent a worsening malocclusion. Principles of Class III early treatment depend on whether it is dental Class III, functional Class III, or skeletal Class III. Practitioners should consider positive and negative factors of a patient before initiating treatment. Likewise, they should understand factors that affect prognosis and stability of the results.

Making progress with PISC III

International Nuclear Information System (INIS)

Crutzen, S.; Nichols, R.; McDonald, N.

1989-01-01

The thirdphase of the Programme for the Inspection of Steel Components (PISC III) was begun in 1986 with the aim of assessing inspection capability and reliability for actual defects in full scale components under realistic nuclear power plant conditions. It is organized by the OECD Nuclear Energy Agency and the Ispra Joint Research Centre of the European Communities Commission. The objectives and status of each of the seven areas of PISC III are given. The areas are: real contaminated structures; full scale vessel tests; nozzles and dissimilar metal welds; austenitic steel testing; steam generator integrity testing; mathematical modelling of non-destructive examination; and human reliability studies. (U.K.)

Sensing of phosphates by using luminescent Eu(III) and Tb(III) complexes: application to the microalgal cell Chlorella vulgaris.

Science.gov (United States)

Nadella, Sandeep; Sahoo, Jashobanta; Subramanian, Palani S; Sahu, Abhishek; Mishra, Sandhya; Albrecht, Markus

2014-05-12

Phenanthroline-based chiral ligands L(1) and L(2) as well as the corresponding Eu(III) and Tb(III) complexes were synthesized and characterized. The coordination compounds show red and green emission, which was explored for the sensing of a series of anions such as F(-), Cl(-), Br(-), I(-), NO3(-), NO2(-), HPO4(2-), HSO4(-), CH3COO(-), and HCO3(-). Among the anions, HPO4(2-) exhibited a strong response in the emission property of both europium(III) and terbium(III) complexes. The complexes showed interactions with the nucleoside phosphates adenosine triphosphate (ATP), adenosine diphosphate (ADP), and adenosine monophosphate (AMP). Owing to this recognition, these complexes have been applied as staining agents in the microalgal cell Chlorella vulgaris. The stained microalgal cells were monitored through fluorescence microscopy and scanning electron microscopy. Initially, the complexes bind to the outer cell wall and then enter the cell wall through holes in which they probably bind to phospholipids. This leads to a quenching of the luminescence properties. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Radiation protection in category III large gamma irradiators

International Nuclear Information System (INIS)

Costa, Neivaldo; Furlan, Gilberto Ribeiro; Itepan, Natanael Marcio

2011-01-01

This article discusses the advantages of category III large gamma irradiator compared to the others, with emphasis on aspects of radiological protection, in the industrial sector. This category is a kind of irradiators almost unknown to the regulators authorities and the industrial community, despite its simple construction and greater radiation safety intrinsic to the model, able to maintain an efficiency of productivity comparable to those of category IV. Worldwide, there are installed more than 200 category IV irradiators and there is none of a category III irradiator in operation. In a category III gamma irradiator, the source remains fixed in the bottom of the tank, always shielded by water, negating the exposition risk. Taking into account the benefits in relation to radiation safety, the category III large irradiators are highly recommended for industrial, commercial purposes or scientific research. (author)

Lanthanum(III) and praseodymium(III) complexes with bidentate and tetradentate Schiff base ligands containing indole ring

International Nuclear Information System (INIS)

Rai, Anita; Sengupta, Soumitra Kumar; Pandey, Om Prakash

2000-01-01

Complexes of lanthanum(III) and praseodymium(III) with Schiff bases, prepared from isatin with aniline, 4-chloroaniline, 2- bromoaniline, 2-nitroaniline (Hl), ethylenediamine, o- phenylenediamine and 4-methyl-o-phenylenediamine (H 2 L') have been synthesised and their physico-chemical properties investigated using elemental analysis, molar conductivities, magnetic susceptibility measurements and spectral (visible, infrared and 1 H NMR) data. The Schiff bases HL bind in a bidentate manner while schiff bases H 2 L' bind in a tetradentate manner. The probable structures of the complexes are proposed. (author)

Effect of Eu(III) on the degradation of malic acid by Pseudomonas fluorescens

International Nuclear Information System (INIS)

Nankawa, T.; Ozaki, T.; Ohnuki, T.; Suzuki, Y.; Francis, A.J.

2005-01-01

Full text of publication follows: The transuranic elements, such as Am(III) and Cm(III), are highly toxic because they emit high-energy α particles and have long half-lives. To estimate their long-term environmental behavior, we need to elucidate degradation of actinide-organic complexes by microorganisms. We studied the biodegradation of Eu(III)-malic acid complexes by Pseudomonas fluorescens. Malic acid is ubiquitous in the environment and is one of the microbial metabolites that is part of the tri-carboxylic acid (TCA) cycle. Europium(III) is a good analogue for Am(III) and Cm(III). To investigate the effect of Eu(III) on the degradation of malic acid by P. fluorescens, we compared the degradation behavior of Eu(III)-malic acid complexes to that of Fe(III) and Al(III)-malic acid complexes. In the medium containing 1 mM malic acid and 0-0.5 mM Fe(III), malic acid was degraded completely. In the medium containing 1 mM malic acid and 0.05-0.5 mM Al(III), malic acid was degraded until the concentration of malic acid became equal to that of Al(III), indicating that Al(III)-malic acid complex with 1: 1 molar ratio was recalcitrant to biodegradation. In the medium containing 1 mM malic acid and 0.05-0.5 mM Eu(III), degradation of malic acid was not observed. The effect of metals on degradation of malic acid was in the order of Fe(III) < Al(III) < Eu(III). The stability constants of 1:1 Fe(III)-, Al(III)-, and Eu(III)-malic acid complexes are 7.1, 4.6, and 4.9, respectively. These results indicate that degradability of malic acid does not depend on the stability constants of metal-malic acid complexes. We found that 10 mM malic acid was degraded in the presence of 0.05 and 0.1 mM Eu(III) but 1 mM malic acid was not degraded in the presence of 0.05 and 0.1 mM Eu(III). The degradation rate of malic acid increased with a decreasing ratio of Eu(III) to malic acid. (authors)

Moessbauer study of Fe(III)-reducing sugar complexes

International Nuclear Information System (INIS)

Wolowiec, S.; Drabent, K.

1985-01-01

Iron(III) complexes with glucose, galactose, mannose and lactose were prepared. The Moessbauer and magnetic susceptibility data demonstrate the polymeric structure of the complexes. The thermal behaviour of the Fe(III)-glucose complex was monitored by Moessbauer spectroscopy. (author)

Synthesis and evaluation of ligands with mixed amide and phosphonate, phosphinoxide, and phosphonothioate sites for An(III)/Ln(III) extraction

NARCIS (Netherlands)

Iqbal, M.; Struijk, R.G.; Huskens, Jurriaan; Sypula, M.; Wilden, A.; Modolo, G.; Verboom, Willem

2012-01-01

Various organophosphorus ligands with a combination of different donor sites were synthesized and evaluated by solvent extraction studies for the complexation of Am(III)/Eu(III). Among the ligands with a glycolamide backbone, those with mixed amide and PO donor sites and a central oxygen or nitrogen

Synthesis, Characterization and Antibacterial Studies of N-(Benzothiazol-2-yl)-4-chlorobenzenesulphonamide and Its Neodymium(III) and Thallium(III) Complexes.

Science.gov (United States)

Obasi, Lawrence Nnamdi; Oruma, Uchechukwu Susan; Al-Swaidan, Ibrahim Abdulrazak; Ramasami, Ponnadurai; Ezeorah, Chigozie Julius; Ochonogor, Alfred Ezinna

2017-02-22

N -(Benzothiazol-2-yl)-4-chlorobenzenesulphonamide (NBTCS) was synthesized by condensation reaction of 4-chlorobenzenesulphonyl chloride and 2-aminobenzothiazole in acetone under reflux. Neodymium(III) and thallium(III) complexes of the ligand were also synthesized. Both ligand and metal complexes were characterized using UV-Vis, IR, ¹H- and 13 C-NMR spectroscopies, elemental analysis and molar conductance measurement. IR studies revealed that the ligand is tridentate and coordinates to the metal ions through nitrogen and oxygen atoms of the sulphonamide group and nitrogen atom attached to benzothiazole ring. The neodymium(III) complex displays a coordination number of eight while thallium(III) complex displays a coordination number of six. The ligand and its complexes were screened in vitro for their antibacterial activities against Escherichia coli strains ( E. coli 6 and E. coli 13 ), Proteus species, Staphylococcus aureus and Pseudomonas aeruginosa using the agar well diffusion technique. The synthesized compounds were found to be more active against the microorganisms screened relative to ciprofloxacin, gentamicin and co-trimoxazole.

Summary of Session III

International Nuclear Information System (INIS)

Furman, M.A.

2002-01-01

This is a summary of the talks presented in Session III ''Simulations of Electron-Cloud Build Up'' of the Mini-Workshop on Electron-Cloud Simulations for Proton and Positron Beams ECLOUD-02, held at CERN, 15-18 April 2002

Particle Aggregation During Fe(III) Bioreduction in Nontronite

Science.gov (United States)

Jaisi, D. P.; Dong, H.; Hi, Z.; Kim, J.

2005-12-01

This study was performed to evaluate the rate and mechanism of particle aggregation during bacterial Fe (III) reduction in different size fractions of nontronite and to investigate the role of different factors contributing to particle aggregation. To achieve this goal, microbial Fe(III) reduction experiments were performed with lactate as an electron donor, Fe(III) in nontronite as an electron acceptor, and AQDS as an electron shuttle in bicarbonate buffer using Shewanella putrefaceins CN32. These experiments were performed with and without Na- pyrophosphate as a dispersant in four size fractions of nontronite (0.12-0.22, 0.41-0.69, 0.73-0.96 and 1.42-1.8 mm). The rate of nontronite aggregation during the Fe(III) bioreduction was measured by analyzing particle size distribution using photon correlation spectroscopy (PCS) and SEM images analysis. Similarly, the changes in particle morphology during particle aggregation were determined by analyses of SEM images. Changes in particle surface charge were measured with electrophoretic mobility analyzer. The protein and carbohydrate fraction of EPS produced by cells during Fe(III) bioreduction was measured using Bradford and phenol-sulfuric acid extraction method, respectively. In the presence of the dispersant, the extent of Fe(III) bioreduction was 11.5-12.2% within the first 56 hours of the experiment. There was no measurable particle aggregation in control experiments. The PCS measurements showed that the increase in the effective diameter (95% percentile) was by a factor of 3.1 and 1.9 for particle size of 0.12-0.22 mm and 1.42-1.80 mm, respectively. The SEM image analyses also gave the similar magnitude of increase in particle size. In the absence of the dispersant, the extent of Fe(III) bioreduction was 13.4-14.5% in 56 hours of the experiment. The rate of aggregation was higher than that in the presence of the dispersant. The increase in the effective diameter (95% percentile) was by a factor of 13.6 and 4.1 for

Magnetooptical investigations on ferromagnetic III-V-semiconductors; Magnetooptische Untersuchungen an ferromagnetischen III-V-Halbleitern

Energy Technology Data Exchange (ETDEWEB)

Winter, Andreas

2009-07-23

Magnetooptical Kerr effect (MOKE) and Magnetic Circular Dichroism (MCD) have been used to investigate magnetic as well as bandstructure properties of diluted magnetic III-V-semiconductors containing Mn. In these ferromagnetic systems it has been found that the strength of the observed effects depends linearly on the magnetization of the samples with no influence of the external magnetic field. The magnetooptical effects allowed the recording of hysteresis loops of GaMnAs, GaMnSb, InMnAs and InMnSb samples for different temperatures and in the case of GaMnAs also for different alignments of the external magnetic field with respect to the easy axis of magnetization. The Stoner-Wohlfahrt-Model has been used to describe the resulting shapes of the loops yielding the magnetic anisotropy parameters of the samples. For magnetically saturated samples, spectra of MOKE and MCD have been recorded. Contrary to pure III-V-semiconductors, which exhibit lots of sharp resonances due to interband transitions between Landau levels, III-Mn-V-semi-conductors how only very few (or just one) considerably broad resonance(s). Their spectral position(s) do(es) neither depend upon the magnetic field as it would be the case for pure III-V-semiconductors nor the magnetization. Only the amplitude increases linearly with the magnetization. Utilizing a kp-theory it has been possible to describe the observed dependencies. Valence- and conduction-band are split into Landau levels by the external magnetic field and, in addition to the Zeeman-effect, the spin-levels are split by the exchange interaction between the localized electrons of the Mn ions and the free carriers which is proportional to the magnetization of the samples. This splitting is much bigger than the Landau level splitting. Due to an inhomogeneous distribution of the Mn ions and due to the high carrier density the Landau levels are strongly broadened and their structure is not observable. Owing to the high carrier-concentration in

Scaled Vitrification System III (SVS III) Process Development and Laboratory Tests at the West Valley Demonstration Project

International Nuclear Information System (INIS)

Jain, V.; Barnes, S.M.; Bindi, B.G.; Palmer, R.A.

2000-01-01

At the West Valley Demonstration Project (WVDP),the Vitrification Facility (VF)is designed to convert the high-level radioactive waste (HLW)stored on the site to a stable glass for disposal at a Department of Energy (DOE)-specified federal repository. The Scaled Vitrification System III (SVS-III)verification tests were conducted between February 1995 and August 1995 as a supplemental means to support the vitrification process flowsheet, but at only one seventh the scale.During these tests,the process flowsheet was refined and optimized. The SVS-III test series was conducted with a focus on confirming the applicability of the Redox Forecasting Model, which was based on the Index of Feed Oxidation (IFO)developed during the Functional and Checkout Testing of Systems (FACTS)and SVS-I tests. Additional goals were to investigate the prototypical feed preparation cycle and test the new target glass composition. Included in this report are the basis and current designs of the major components of the Scale Vitrification System and the results of the SVS-III tests.The major subsystems described are the feed preparation and delivery, melter, and off-gas treatment systems. In addition,the correlation between the melter's operation and its various parameters;which included feed rate,cold cap coverage,oxygen reduction (redox)state of the glass,melter power,plenum temperature,and airlift analysis;were developed

Exposure of [Mn{sup III}{sub 6}Cr{sup III}]{sup 3+} single-molecule magnets to soft X-rays: The effect of the counterions on radiation stability

Energy Technology Data Exchange (ETDEWEB)

Helmstedt, Andreas, E-mail: andreas.helmstedt@uni-bielefeld.de [Fakultaet fuer Physik, Universitaet Bielefeld, Universitaetsstrasse 25, D-33615 Bielefeld (Germany); Sacher, Marc D.; Gryzia, Aaron; Harder, Alexander; Brechling, Armin; Mueller, Norbert; Heinzmann, Ulrich [Fakultaet fuer Physik, Universitaet Bielefeld, Universitaetsstrasse 25, D-33615 Bielefeld (Germany); Hoeke, Veronika; Krickemeyer, Erich; Glaser, Thorsten [Fakultaet fuer Chemie, Universitaet Bielefeld, Universitaetsstrasse 25, D-33615 Bielefeld (Germany); Bouvron, Samuel; Fonin, Mikhail [Fachbereich Physik, Universitaet Konstanz, Universitaetsstrasse 10, D-78457 Konstanz (Germany)

2012-01-15

Highlights: Black-Right-Pointing-Pointer [Mn{sup III}{sub 6}Cr{sup III}]{sup 3+} single-molecule magnets adsorbed on gold are investigated. Black-Right-Pointing-Pointer The oxidation state of the Mn{sup III} constituents changes under X-ray exposure. Black-Right-Pointing-Pointer The change is monitored by Mn-L{sub 3}-edge XAS. Black-Right-Pointing-Pointer Choice of anions strongly influences radiation stability of the SMM. Black-Right-Pointing-Pointer No influence of the sample morphology on radiation stability could be observed. - Abstract: X-ray absorption spectroscopy studies of the [Mn{sup III}{sub 6}Cr{sup III}]{sup 3+} single-molecule magnet deposited as a microcrystalline layer on gold substrates are presented. The oxidation state of the manganese centers changes from Mn{sup III} to Mn{sup II} due to irradiation with soft X-rays. The influence of the charge-neutralizing anions on the stability of [Mn{sup III}{sub 6}Cr{sup III}]{sup 3+} against soft X-ray exposure is investigated for the different anions tetraphenylborate (BPh{sub 4}{sup -}), lactate (C{sub 3}H{sub 5}O{sub 3}{sup -}) and perchlorate (ClO{sub 4}{sup -}). The exposure dependence of the radiation-induced reduction process is compared for [Mn{sup III}{sub 6}Cr{sup III}]{sup 3+} with the three different anions.

Design and initial performance of the Sandia Pulsed Reactor-III

International Nuclear Information System (INIS)

Reuscher, J.A.; Estes, B.F.

1976-01-01

The Sandia Pulsed Reactor-III (SPR-III) is a new fast pulsed reactor which has recently undergone initial testing at Sandia Laboratories. SPR-III is a uranium-10 weight percent molybdenum fuel assembly with a 17.78 cm irradiation cavity similar in design to SPR-II which has been in operation since 1967. The basic SPR-III design utilizes the same split-core configuration which has been proven with SPR-II; however, SPR-III uses external reflectors for control and external bolts to hold the fuel plates together. The core consists of sixteen fuel plates with an inside diameter of 17.78 cm, an outside diameter of 29.72 cm, and a core height of 31.9 cm. The fuel mass is about 227 kg of fully enriched uranium-10 weight percent molybdenum alloy. SPR III has completed the initial series of startup tests which included the critical experiment, zero and low-power tests, and pulse testing. The reactor design and results from the initial testing program are described in this paper. A portion of the startup experiments with SPR-III have been completed and this paper discusses the more important aspects of the initial testing program

Eisenia fetida Protease-III-1 Functions in Both Fibrinolysis and Fibrogenesis

Directory of Open Access Journals (Sweden)

Jing Zhao

2007-01-01

Full Text Available The fibrinolytic function of earthworm protease-III-1 (EfP-III-1 has been studied in recent years. Here, we found that EfP-III-1 acted not only in fibrinogenolysis, but also in fibrogenesis. We have used EfP-III-1 to hydrolyze fibrinogen, and to activate plasminogen and prothrombin. Based on the N-terminal sequences of the hydrolytic fragments, EfP-III-1 was showed to specifically recognize the carboxylic sites of arginine and lysine. Analyses by fibrinogenolysis mapping and amino acid sequencing revealed that the isozyme could cleave the alpha, beta, and gamma chains of fibrinogen, showing a high α-fibrinogenase, moderate β-fibrinogenase, and low γ-fibrinogenase activities. Interestingly, EfP-III-1 activated plasminogen and released active plasmin, suggesting a tPA-like function. Furthermore, EfP-III-1 showed a factor Xa-like function on prothrombin, producing alpha-thrombin. The function in both activating prothrombin and catalyzing fibrinogenolysis suggests that EfP-III-1 may play a role in the balance between procoagulation and anticoagulation.

Oral Assessment Kit, Levels II & III. Draft.

Science.gov (United States)

Agrelo-Gonzalez, Maria; And Others

The assessment packet includes a series of oral tests to help develop speaking as an integral part of second language instruction at levels II and III. It contains: 8 mini-tests for use at level II; 9 mini-tests for use at level III; a rating scale and score sheet masters for evaluating performance on these tests; and a collection of suggested…

Studies of Some Lanthanide(III Nitrate Complexes of Schiff Base Ligands

Directory of Open Access Journals (Sweden)

Kishor Arora Mukesh Sharma

2009-01-01

Full Text Available The studies of 16 new lanthanide(III nitrate complexes of Schiff base ligands are discussed. Schiff bases were obtained by the condensation of 2–methyl–4–N,N–bis–2' –cyanoethyl aminobenzaldehyde with aniline and 3 different substituted anilines. Lanthanide(III nitrates, viz. gadolinium(III nitrate, lanthanum(III nitrate, samarium(III nitrate and cerium(III nitrate were chosen to synthesize new complexes. The complexes were characterized on the basis of physicochemical studies viz. elemental analysis, spectral, viz. IR and electronic spectral and magnetic studies. TGA studies of some of the representative complexes were also done. Some of the representative complexes were also screened for the anti microbial studies.

Papel dos medicamentos nas intoxicações causadas por agentes químicos em município da Bahia, no período de 2007 a 2010

Directory of Open Access Journals (Sweden)

Amanda dos Santos Teles

2013-04-01

Full Text Available A intoxicação medicamentosa é um problema de grande relevância para a saúde pública. No Brasil, os medicamentos são os principais agentes responsáveis por intoxicações humanas. Este artigo objetivou descrever o perfil e a evolução das intoxicações no município de Feira de Santana, Bahia, nos anos 2007 a 2010, e analisar a morbimortalidade causada por medicamentos. Neste estudo transversal, com caráter descritivo, foram analisados 631 casos registrados no SINAN. As variáveis utilizadas foram: sexo; faixa etária; raça; escolaridade; ocupação; evolução do caso notificado; zona de ocorrência da intoxicação; circunstância determinante para a ocorrência da intoxicação; tipo de exposição; frequência deste agravo; e tipo de unidade notificadora. Constatou-se que a intoxicação por medicamentos representou 33% das intoxicações, seguida de “raticidas” (18%, sendo a “tentativa de suicídio”, circunstância responsável, em 2010, por 81% das notificações. O sexo ‘feminino’ apresentou o maior número de casos registrados, bem como as crianças de 1 a 4 anos e os adultos jovens. A letalidade observada em Feira de Santana foi muito maior do que a média regional e nacional, excetuando-se o ano de 2009. A Vigilância em Saúde deve priorizar ações educativas, preventivas e intersetoriais, que assegurem o uso correto de medicamentos e melhorem seu impacto na saúde, bem como investir na sensibilização continuada dos profissionais da Atenção Básica para melhorar a notificação deste importante agravo.

Expansion/Facemask Treatment of an Adult Class III Malocclusion.

Science.gov (United States)

Jackson, Gregory W; Kravitz, Neal D

2014-01-01

The orthodontic treatment of class III malocclusion with a maxillary deficiency is often treated with maxillary protraction with or without expansion. Skeletal and dental changes have been documented which have combined for the protraction of the maxilla and the correction of the class III malocclusion. Concerning the ideal time to treat a developing class III malocclusion, studies have reported that, although early treatment may be the most effective, face mask therapy can provide a viable option for older children as well. But what about young adults? Can the skeletal and dental changes seen in expansion/facemask therapy in children and adolescents be demonstrated in this age group as well, possibly eliminating the need for orthodontic dental camouflage treatment or orthognathic surgery? A case report is presented of an adult class III malocclusion with a Class III skeletal pattern and maxillary retrusion. Treatment was with nonextraction, comprehensive edgewise mechanics with slow maxillary expansion with a bonded expander and protraction facemask.

Expansion/Facemask Treatment of an Adult Class III Malocclusion

Directory of Open Access Journals (Sweden)

Gregory W. Jackson

2014-01-01

Full Text Available The orthodontic treatment of class III malocclusion with a maxillary deficiency is often treated with maxillary protraction with or without expansion. Skeletal and dental changes have been documented which have combined for the protraction of the maxilla and the correction of the class III malocclusion. Concerning the ideal time to treat a developing class III malocclusion, studies have reported that, although early treatment may be the most effective, face mask therapy can provide a viable option for older children as well. But what about young adults? Can the skeletal and dental changes seen in expansion/facemask therapy in children and adolescents be demonstrated in this age group as well, possibly eliminating the need for orthodontic dental camouflage treatment or orthognathic surgery? A case report is presented of an adult class III malocclusion with a Class III skeletal pattern and maxillary retrusion. Treatment was with nonextraction, comprehensive edgewise mechanics with slow maxillary expansion with a bonded expander and protraction facemask.

77 FR 64397 - Order of Succession for HUD Region III

Science.gov (United States)

2012-10-19

... Region III AGENCY: Office of Field Policy and Management, HUD. ACTION: Notice of Order of Succession... Office and its Field Offices (Region III). This Order of Succession supersedes all prior Orders of Succession for HUD Region III. DATES: Effective Date: October 9, 2012. FOR FURTHER INFORMATION CONTACT...

Interdisciplinary orthognathic treatment of high angle class III ...

African Journals Online (AJOL)

For Class III adult patients, combined treatment strategy must be followed which includes either further dentoalveolar compensation or orthognathic surgery following decompensation of the teeth. This case report presents the interdisciplinary approach of a skeletal Class III malocclusion with increased vertical facial ...

Rhodium(III)- and iridium(III)-catalyzed C7 alkylation of indolines with diazo compounds.

Science.gov (United States)

Ai, Wen; Yang, Xueyan; Wu, Yunxiang; Wang, Xuan; Li, Yuanchao; Yang, Yaxi; Zhou, Bing

2014-12-22

A Rh(III)-catalyzed procedure for the C7-selective C-H alkylation of various indolines with α-diazo compounds at room temperature is reported. The advantages of this process are: 1) simple, mild, and pH-neutral reaction conditions, 2) broad substrate scope, 3) complete regioselectivity, 4) no need for an external oxidant, and 5) N2 as the sole byproduct. Furthermore, alkylation and bis-alkylation of carbazoles at the C1 and C8 positions have also been developed. More significantly, for the first time, a successful Ir(III)-catalyzed intermolecular insertion of arene C-H bonds into α-diazo compounds is reported. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Kinetic modeling of antimony(III) oxidation and sorption in soils.

Science.gov (United States)

Cai, Yongbing; Mi, Yuting; Zhang, Hua

2016-10-05

Kinetic batch and saturated column experiments were performed to study the oxidation, adsorption and transport of Sb(III) in two soils with contrasting properties. Kinetic and column experiment results clearly demonstrated the extensive oxidation of Sb(III) in soils, and this can in return influence the adsorption and transport of Sb. Both sorption capacity and kinetic oxidation rate were much higher in calcareous Huanjiang soil than in acid red Yingtan soil. The results indicate that soil serve as a catalyst in promoting oxidation of Sb(III) even under anaerobic conditions. A PHREEQC model with kinetic formulations was developed to simulate the oxidation, sorption and transport of Sb(III) in soils. The model successfully described Sb(III) oxidation and sorption data in kinetic batch experiment. It was less successful in simulating the reactive transport of Sb(III) in soil columns. Additional processes such as colloid facilitated transport need to be quantified and considered in the model. Copyright © 2016 Elsevier B.V. All rights reserved.

Detection of COL III in Parchment by Amino Acid Analysis

DEFF Research Database (Denmark)

Vestergaard Poulsen Sommer, Dorte; Larsen, René

2016-01-01

Cultural heritage parchments made from the reticular dermis of animals have been subject to studies of deterioration and conservation by amino acid analysis. The reticular dermis contains a varying mixture of collagen I and III (COL I and III). When dealing with the results of the amino acid...... analyses, till now the COL III content has not been taken into account. Based on the available amino acid sequences we present a method for determining the amount of COL III in the reticular dermis of new and historical parchments calculated from the ratio of Ile/Val. We find COL III contents between 7...... and 32 % in new parchments and between 0.2 and 40 % in the historical parchments. This is consistent with results in the literature. The varying content of COL III has a significant influence on the uncertainty of the amino acid analysis. Although we have not found a simple correlation between the COL...

Th(As(III)4As(V)4O18): a mixed-valent oxoarsenic(III)/arsenic(V) actinide compound obtained under extreme conditions.

Science.gov (United States)

Yu, Na; Klepov, Vladislav V; Kegler, Philip; Bosbach, Dirk; Albrecht-Schmitt, Thomas E; Alekseev, Evgeny V

2014-08-18

A high-temperature/high-pressure method was employed to investigate phase formation in the Th(NO3)4·5H2O-As2O3-CsNO3 system. It was observed that an excess of arsenic(III) in starting system leads to the formation of Th(As(III)4As(V)4O18), which is representative of a rare class of mixed-valent arsenic(III)/arsenic(V) compounds. This compound was studied with X-ray diffraction, energy-dispersive X-ray, and Raman spectroscopy methods. Crystallographic data show that Th(As(III)4As(V)4O18) is built from (As(III)4As(V)4O18)(4-) layers connected through Th atoms. The arsenic layers are found to be isoreticular to those in previously reported As2O3 and As3O5(OH), and the geometric differences between them are discussed. Bands in the Raman spectrum are assigned with respect to the presence of AsO3 and AsO4 groups.

Luminescent amine sensor based on europium(III) chelate.

Science.gov (United States)

Petrochenkova, Nataliya V; Mirochnik, Anatolii G; Emelina, Tatyana B; Sergeev, Alexander A; Leonov, Andrei A; Voznesenskii, Sergey S

2018-07-05

The effect of methylamine vapor on luminescence of Eu(III) tris-benzoylacetonate (I) immobilized in thin-layer chromatography plates has been investigated. It has been revealed that interaction of I with analyte vapor results in increase of the intensity of Eu(III) luminescence. The mechanism of the effect of methylamine vapors on intensification of the Eu(III) luminescence has been suggested using the data of IR spectroscopy and quantum chemistry calculations. The mechanism of luminescence sensitization consists in bonding of an analyte molecule with a water molecule into the coordination sphere of Eu(III). As a result, the bond of a water molecule with the luminescence centre weakens, rigid structural fragment including europium ion, water and methylamine molecules forms. The presence of such fragment must naturally promote decrease of influence of OH-vibrations on luminescence of the complex I. Copyright © 2018 Elsevier B.V. All rights reserved.

Cobalt(III) complex

Indian Academy of Sciences (India)

Administrator

e, 40 µM complex, 10 hrs after dissolution, f, 40 µM complex, after irradiation dose 15 Gy. and H-atoms result in reduction of Co(III) to Co. (II). 6. It is interesting to see in complex containing multiple ligands what is the fate of electron adduct species formed by electron addition. Reduction to. Co(II) and intramolecular transfer ...

Revised SNAP III Training Manual

Energy Technology Data Exchange (ETDEWEB)

Moss, Calvin Elroy [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Gonzales, Samuel M. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Myers, William L. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nelson, Mark Andrew [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rothrock, Richard Brian [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Salazar, Samuel A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sorensen, Eric Byron [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sundby, Gary M. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

2017-11-21

The Shielded Neutron Assay Probe (SNAP) technique was developed to determine the leakage neutron source strength of a radioactive object. The original system consisted of an Eberline^TM Mini-scaler and discrete neutron detector. The system was operated by obtaining the count rate with the Eberline^TM instrument, determining the absolute efficiency from a graph, and calculating the neutron source strength by hand. In 2003 the SNAP III, shown in Figure 1, was designed and built. It required the operator to position the SNAP, and then measure the source-to-detector and detectorto- reflector distances. Next the operator entered the distance measurements and started the data acquisition. The SNAP acquired the required count rate and then calculated and displayed the leakage neutron source strength (NSS). The original design of the SNAP III is described in SNAP III Training Manual (ER-TRN-PLN-0258, Rev. 0, January 2004, prepared by William Baird) This report describes some changes that have been made to the SNAP III. One important change is the addition of a LEMO connector to provide neutron detection output pulses for input to the MC-15. This feature is useful in active interrogation with a neutron generator because the MC-15 has the capability to only record data when it is not gated off by a pulse from the neutron generator. This avoids recording of a lot of data during the generator pulses that are not useful. Another change was the replacement of the infrared RS-232 serial communication output by a similar output via a 4-pin LEMO connector. The current document includes a more complete explanation of how to estimate the amount of moderation around a neutron-emitting source.

SGN III code conversion from Apollo to HP

International Nuclear Information System (INIS)

Lee, Hae Cho

1996-04-01

SGN III computer code is used to analyze transient behavior of reactor coolant system, pressurizer and steam generators in the event of main steam line break (MSLB), and to calculate mass and energy release for containment design. This report firstly describes detailed work carried out for installation of SFN III on Apollo DN 10000 and code validation results after installation. Secondly, a series of work is also describes in relation to installation of SGN III on HP 9000/700 series as well as relevant code validation results. Attached is a report on software verification and validation results. 8 refs. (Author) .new

A heptadecanuclear Mn(III)9Dy(III)8 cluster derived from triethanolamine with two edge sharing supertetrahedra as the core and displaying SMM behaviour.

Science.gov (United States)

Langley, Stuart K; Moubarakia, Boujemaa; Murray, Keith S

2010-06-07

A heterometallic, heptadecanuclear cluster of formula [Mn(III)9Dy(III)8O8(OH)8(tea)2(teaH)2(teaH2)4(Ac)4(NO3)2(H2O)4](NO3)7·8H2O (1) is reported. The core of 1 displays two edge sharing Mn(III)5Dy(III)5 supertetrahedra and represents one of the largest Mn/4f cluster compound so far reported. Magnetic studies show that 1 displays probable SMM behaviour as observed via non-zero values in the χM''vs T plot.

Defects and oxidation of group-III monochalcogenide monolayers

Science.gov (United States)

Guo, Yu; Zhou, Si; Bai, Yizhen; Zhao, Jijun

2017-09-01

Among various two-dimensional (2D) materials, monolayer group-III monochalcogenides (GaS, GaSe, InS, and InSe) stand out owing to their potential applications in microelectronics and optoelectronics. Devices made of these novel 2D materials are sensitive to environmental gases, especially O2 molecules. To address this critical issue, here we systematically investigate the oxidization behaviors of perfect and defective group-III monochalcogenide monolayers by first-principles calculations. The perfect monolayers show superior oxidation resistance with large barriers of 3.02-3.20 eV for the dissociation and chemisorption of O2 molecules. In contrast, the defective monolayers with single chalcogen vacancy are vulnerable to O2, showing small barriers of only 0.26-0.36 eV for the chemisorption of an O2 molecule. Interestingly, filling an O2 molecule to the chalcogen vacancy of group-III monochalcogenide monolayers could preserve the electronic band structure of the perfect system—the bandgaps are almost intact and the carrier effective masses are only moderately disturbed. On the other hand, the defective monolayers with single vacancies of group-III atoms carry local magnetic moments of 1-2 μB. These results help experimental design and synthesis of group-III monochalcogenides based 2D devices with high performance and stability.

Failures in Phase III: Causes and Consequences.

Science.gov (United States)

Seruga, Bostjan; Ocana, Alberto; Amir, Eitan; Tannock, Ian F

2015-10-15

Phase III randomized controlled trials (RCT) in oncology fail to lead to registration of new therapies more often than RCTs in other medical disciplines. Most RCTs are sponsored by the pharmaceutical industry, which reflects industry's increasing responsibility in cancer drug development. Many preclinical models are unreliable for evaluation of new anticancer agents, and stronger evidence of biologic effect should be required before a new agent enters the clinical development pathway. Whenever possible, early-phase clinical trials should include pharmacodynamic studies to demonstrate that new agents inhibit their molecular targets and demonstrate substantial antitumor activity at tolerated doses in an enriched population of patients. Here, we review recent RCTs and found that these conditions were not met for most of the targeted anticancer agents, which failed in recent RCTs. Many recent phase III RCTs were initiated without sufficient evidence of activity from early-phase clinical trials. Because patients treated within such trials can be harmed, they should not be undertaken. The bar should also be raised when making decisions to proceed from phase II to III and from phase III to marketing approval. Many approved agents showed only better progression-free survival than standard treatment in phase III trials and were not shown to improve survival or its quality. Introduction of value-based pricing of new anticancer agents would dissuade the continued development of agents with borderline activity in early-phase clinical trials. When collaborating with industry, oncologists should be more critical and better advocates for cancer patients. ©2015 American Association for Cancer Research.

Baseline metal enrichment from Population III star formation in cosmological volume simulations

Science.gov (United States)

Jaacks, Jason; Thompson, Robert; Finkelstein, Steven L.; Bromm, Volker

2018-04-01

We utilize the hydrodynamic and N-body code GIZMO coupled with our newly developed sub-grid Population III (Pop III) Legacy model, designed specifically for cosmological volume simulations, to study the baseline metal enrichment from Pop III star formation at z > 7. In this idealized numerical experiment, we only consider Pop III star formation. We find that our model Pop III star formation rate density (SFRD), which peaks at ˜ 10- 3 M⊙ yr- 1 Mpc- 1 near z ˜ 10, agrees well with previous numerical studies and is consistent with the observed estimates for Pop II SFRDs. The mean Pop III metallicity rises smoothly from z = 25 to 7, but does not reach the critical metallicity value, Zcrit = 10-4 Z⊙, required for the Pop III to Pop II transition in star formation mode until z ≃ 7. This suggests that, while individual haloes can suppress in situ Pop III star formation, the external enrichment is insufficient to globally terminate Pop III star formation. The maximum enrichment from Pop III star formation in star-forming dark matter haloes is Z ˜ 10-2 Z⊙, whereas the minimum found in externally enriched haloes is Z ≳ 10-7 Z⊙. Finally, mock observations of our simulated IGM enriched with Pop III metals produce equivalent widths similar to observations of an extremely metal-poor damped Lyman alpha system at z = 7.04, which is thought to be enriched by Pop III star formation only.

Basel III and Asset Securitization

Directory of Open Access Journals (Sweden)

M. Mpundu

2013-01-01

Full Text Available Asset securitization via special purpose entities involves the process of transforming assets into securities that are issued to investors. These investors hold the rights to payments supported by the cash flows from an asset pool held by the said entity. In this paper, we discuss the mechanism by which low- and high-quality entities securitize low- and high-quality assets, respectively, into collateralized debt obligations. During the 2007–2009 financial crisis, asset securitization was seriously inhibited. In response to this, for instance, new Basel III capital and liquidity regulations were introduced. Here, we find that we can explicitly determine the transaction costs related to low-quality asset securitization. Also, in the case of dynamic and static multipliers, the effects of unexpected negative shocks such as rating downgrades on asset price and input, debt obligation price and output, and profit will be quantified. In this case, we note that Basel III has been designed to provide countercyclical capital buffers to negate procyclicality. Moreover, we will develop an illustrative example of low-quality asset securitization for subprime mortgages. Furthermore, numerical examples to illustrate the key results will be provided. In addition, connections between Basel III and asset securitization will be highlighted.

XAS signatures of Am(III) adsorbed onto magnetite and maghemite

DEFF Research Database (Denmark)

Finck, N.; Radulescu, L.; Schild, D.

2016-01-01

Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms...... monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe2O3. Alternatively, the lower Fe coordination number can also be due...

Fluorescence Resonance Energy Transfer of the Tb(III)-Nd(III) Binary System in Molten LiCl-KCl Eutectic Salt

Energy Technology Data Exchange (ETDEWEB)

Kim, B. Y. [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Yun, J. I. [KAIST, Daejeon (Korea, Republic of)

2015-05-15

The lanthanides act as a neutron poison in nuclear reactor with large neutron absorption cross section. For that reason, very low amount of lanthanides is required in the recovered U/TRU ingot product from pyrochemical process. In view of that, the investigation of thermodynamic properties and chemical behaviors of lanthanides in molten chloride salt are necessary to estimate the performance efficiency of pyrochemical process. However, there are uncertainties about knowledge and understanding of basic mechanisms in pyrochemical process, such as chemical speciation and redox behaviors due to the lack of in-situ monitoring methods for high temperature molten salt. The spectroscopic analysis is one of the probable techniques for in-situ qualitative and quantitative analysis. Recently, a few fluorescence spectroscopic measurements on single lanthanide element in molten LiCl-KCl eutectic have been investigated. The fluorescence intensity and the fluorescence lifetime of Tb(III) were decreased as increasing the concentration of Nd(III), demonstrating collisional quenching between donor ions and acceptor ions. The Forster distance (..0) of Tb(III)-Nd(III) binary system in molten LiCl-KCl eutectic was determined in the specific range of .... (0.1-1.0) and .. (1.387-1.496)

The determination of antithrombin III by radioimmunoassay and its clinical application

International Nuclear Information System (INIS)

Chan, V.; Chan, T.K.; Wong, V.; Tso, S.G.; Todd, D.

1979-01-01

A radioimmunoassay (RIA) has been developed for the determination of antithrombin III (AT III) in man. The detection limit was 25 μg/dl. At III-RIA level and biological activity (anti-Xa) was significantly correlated (r = 0.737, P < 0.0001). Plasma levels in 36 healthy males (mean +- SD, 19.9 +- 2.5 mg/dl) and 21 healthy females (19.1 +- 2.4 mg/dl) were similiar. Serial AT III measurements in normal menstruating females showed lower levels during midcycle and higher concentrations during menstruation. In carcinomas, the AT III levels were lower than normal, particularly in hepatocellular carcinoma. In cirrhosis of liver, the levels were markedly decreased and in some patients were below that found in congenital AT III deficiency. Patients with deep vein thrombosis and patients with heart valve replacement had lower levels than normal, while patients with cerebral vascular occlusion had normal levels. The possible use of AT III as a diagnostic tool of post-operative deep vein thrombosis was demonstrated in one patient after hysterectomy. The increased sensitivity, specificity and precision of this type of assay offer distinct advantages over existing methods of AT III estimation. (author)

Thermal behaviour of cesiumchloroferrates(III). 4

International Nuclear Information System (INIS)

Ziemer, B.; Fest, M.; Hass, D.; Leibnitz, P.

1989-01-01

Tricesium aquapentachloroferrate(III) chloride crystallizes from acid aqueous solutions of FeCl 3 · 6 H 2 O and CsCl in the triclinic space group P-bar1 with a = 714.1 pm, b = 1070.9 pm, c = 950.4 pm, α = 105.65 0 , β = 109.51 0 , γ = 89.08 0 and Z = 2. The compound is formed also from dicesium aquapentachloroferrate(III) and cesium chloride in a solid state reaction. The orientational relationships between the educt and product phases are elucidated, and a topotactic reaction mechanism is discussed. (author)

Making a robust carbon-cobalt(III) bond

DEFF Research Database (Denmark)

Larsen, Erik; Madsen, Anders Østergaard; Kofod, Pauli

2009-01-01

The coordination ion with a well-characterized carbon-cobalt(III) bond, the (1,4,7-triazacyclononane)(1,6-diamino-3-thia-4-hexanido)cobalt(III) dication, [Co(tacn)(C-aeaps)](2+) (aeaps, for aminoethylaminopropylsulfide), has been reacted with iodomethane, and the S-methyl thionium derivative has...... been isolated. The crystal structure of the resulting [Co(tacn)(C-aeaps-SCH(3))]Br(3) x 3 H(2)O at 122 K has been determined by X-ray diffraction techniques to verify the structure. The crystal structure determination shows that the carbon-cobalt bond length is even shorter (2.001(4) A) than in [Co......(tacn)(C-aeaps)](2+) participates in bonding to cobalt(III), having implications for the transformation between the carbon- and sulfur-bound forms of the aeaps ligand....

The steam generator programme of PISC III

International Nuclear Information System (INIS)

Birac, C.; Herkenrath, H.

1990-12-01

The PISC III Actions are intended to extend the results and methodologies of the previous PISC excercises, i.e. the validation of the capabilities of the various examination techniques when used on real defects in real components under real conditions of inspection. Being aware of the important safety role that steam generator tubes play as barrier between primary and secondary cooling system and of the industrial problems that the degradation of these tubes can create, the PISC III Management Board agreed to include in the PISC III Programme a special Action on Steam Generator Tubes Testing (SGT). It was decided to organize the programme in three phases, including Round Robin Tests (RRT): - capability tests on loose tubes, - capability tests on transportable mock-ups, - reliability tests on fixed mock-ups including some interesting SURRY tubes

Electronic Biosensors Based on III-Nitride Semiconductors.

Science.gov (United States)

Kirste, Ronny; Rohrbaugh, Nathaniel; Bryan, Isaac; Bryan, Zachary; Collazo, Ramon; Ivanisevic, Albena

2015-01-01

We review recent advances of AlGaN/GaN high-electron-mobility transistor (HEMT)-based electronic biosensors. We discuss properties and fabrication of III-nitride-based biosensors. Because of their superior biocompatibility and aqueous stability, GaN-based devices are ready to be implemented as next-generation biosensors. We review surface properties, cleaning, and passivation as well as different pathways toward functionalization, and critically analyze III-nitride-based biosensors demonstrated in the literature, including those detecting DNA, bacteria, cancer antibodies, and toxins. We also discuss the high potential of these biosensors for monitoring living cardiac, fibroblast, and nerve cells. Finally, we report on current developments of covalent chemical functionalization of III-nitride devices. Our review concludes with a short outlook on future challenges and projected implementation directions of GaN-based HEMT biosensors.

Determinação de ferro (III em produtos farmacêuticos por titulação fotométrica = Determination of iron (III in pharmaceutical products by photometric titration

Directory of Open Access Journals (Sweden)

Airton Vicente Pereira

2011-01-01

Full Text Available Este trabalho descreve a montagem de um sistema de titulacao fotometrica simples e de baixo custo para a determinacao de ferro (III em produtos farmaceuticos. O sistema de titulacao fotometrica foi construido utilizando-se a bomba peristaltica de um espectrofotometro convencional. O procedimento e baseado na titulacao de ferro (III com EDTA e acido salicilico como indicador. A absorcao do complexo ferro (III-acido salicilico foi monitorada espectrofotometricamente em 525 nm. O limite de quantificacao foi de 5 ƒÝg de ferro (III. O procedimento de titulacao fotometrica foi aplicado para a determinacao de ferro (III em amostras contendo sulfato ferroso e hidroxido ferrico polimaltosado. O procedimento mostrou sensibilidade, reprodutibilidade e precisao para a utilizacao em analise rotineira de ferro (III em produtos farmaceuticos.This paper describes a simple, precise and low-cost photometrictitration method for iron (III determination in pharmaceutical preparations. The photometric titration system was constructed using the peristaltic pump of a conventional spectrophotometer. The method is based on titration of iron (III with EDTA using salicylic acid as indicator. The absorption of the iron (III-salicylic acid complex wasmonitored spectrophotometrically at 525 nm. The limit of quantification was 5 ƒÝg of iron (III. The photometric titration procedure was applied for the determination of iron (III in samples of ferrous sulfate and ferric hydroxide polymaltose complex. The procedure showed sensibility, reproducibility and accuracy for use as a method for the routine analysis of iron (III in pharmaceutical formulations.