Failed Switching off in the MIBI-Parathyroid Scintigraphy in a Dialyzed Patient with Secondary Hyperparathyroidism Responsive to Cinacalcet Therapy

The aims of your case report is to show the predictivity of 99mTc-sestamibi (MIBI) scintigraphy and doppler ultrasound imaging on secondary hyperparathyroidism (SHPT) in a patient responsive to calcimimetic treatment. Moreover, it has been reported that calcimimetic has great potential in reducing the volume of the parathyroid gland. On the other hand, the MIBI scintigraphy is considered a crucial diagnostic procedure to monitor the response to therapy in terms of turnover and cellular metabolism; whereas, ultrasound to monitor the volume variation in response to treatment. It is described the case of a 73-year-old man on hemodialysis from 1995 for ESRD. Within 2 years the patient gradually developed SHPT with progressively increased iPTH up to 1,000 ρg/ml. The ultrasound, highlighted the presence of two parathyroid hyperplasia, confirmed by scintigraphy, showing focal increase uptake of sestamibi in the same anatomical areas. As a result of the patient's refusal to perform a parathyroidectomy, cinacalcet, was administered (65 mg overage daily dose). After a year of treatment, there was a striking decrease of iPTH (from 1300 to 57 ρg/ml, −95%); but, on the contrary to expectations, this positive metabolic outcome, was not followed by parathyroid changes in ultrasound and scintigraphic findings

Clathrate hydrate equilibrium data for gas mixture of carbon dioxide and nitrogen in the presence of an emulsion of cyclopentane in water.

International audienceCarbon dioxide and nitrogen gas separation is achieved through clathrate hydrate formation in the presence of cyclopentane. A phase diagram is presented in which the mole fraction of CO2 in the gas phase is plotted against the mole fraction of CO2 in the carbon dioxide + nitrogen + cyclopentane mixed hydrate phase, both defined with respect to total amount of CO2 and N2 in the respective phase. The curve is plotted for temperatures ranging from 283.5 K to 287.5 K and pressures from 0.76 MPa to 2.23 MPa. The results show that the carbon dioxide selectivity is moderately enhanced when cyclopentane is present in the mixed hydrate phase. Carbon dioxide could be enriched in the hydrate phase by attaining a mole fraction of up to 0.937 when the corresponding mole fraction in the gas mixture amounts to 0.507. When compared to the three phase hydrate-aqueous liquid-vapor equilibrium in the ternary system {water + carbon dioxide + nitrogen}, the equilibrium pressure of the mixed hydrate is reduced by 0.95 up to 0.97. The gas storage capacity approaches 40 m3 gas*m-3 of hydrate. This value turns out to be roughly constant and independent of the gas composition and the operating conditions

Oxidation kinetics of a Ni-Cu based cermet at high temperature

The oxidation kinetics of a cermet composed of Ni–Cu alloy and nickel ferrite was studied by thermogravimetry at 960 °C under oxygen in the range 0.5–77 kPa. After an initial mass increase up to 15 g/m2 due to oxidation of surface metallic particles, the mass change was attributed to both outwards NiO growth and internal oxidation. Above 40 g/m2, the NiO scale thickness remained constant and the oxidation kinetics followed a complete parabolic law. The variations of the kinetic rate with oxygen partial pressure allowed to propose mechanisms, rate-controlling steps and kinetic laws in both transient and long term oxidation periods

Estudio de la modulación de la vía autofágica en eritroblastos leucémicos con principios activos presentes en Plantago major L y P. lanceolata L

Las drogas vegetales y/o sintéticas constituyen la base de medicamentos. Un fitofármaco de acuerdo a lo establecido por la legislación vigente es aquel que contiene como principio activo drogas vegetales y/o mezclas definidas y/o preparados de drogas vegetales usadas con fines medicinales. Su eficacia y seguridad está avalada por documentos tecno-científicos e investigaciones etno-farmacológicas. El desarrollo del conocimiento químico, farmacológico y clínico de las mismas, ha permitido la formulación de nuevas formas de preparación y administración. Estudios previos indicaron que principios activos de Plantago tienen citotoxidad selectiva sobre células leucémicas, estos llevó a investigar si la muerte celular estaría relacionada con la muerte autofágica. El objetivo fue establecer los mecanismos de modulación de la vía autofágica en células K562, que resultan de la aplicación del extracto de Plantago mayor y del principio activo en estudio

Análisis de la permanencia de boldina, acción terapéutica y posibles riesgos”

las plantas de boldo bajo la presentación en saquito tienen una disminución de agentes activos en comparación con las plantas de boldo conseguidas en dietéticas bajo la presentación en hoja. A su vez por la permanencia de agente activo, el boldo puede ser utilizado como coadyuvante en el tratamiento de patologías digestivas, pero también se necesita conocer dosificaciones para evitar posibles peligros de intoxicación, como así también evitar interacciones con medicamentos y posibles riesgos en embarazo, lactancia y niñez

Generation of sequence-specific, high affinity anti-DNA antibodies.

By taking advantage of the extreme stability of a protein-DNA complex, we have obtained two highly specific monoclonal antibodies against a predetermined palindromic DNA sequence corresponding to the binding site of the E2 transcriptional regulator of the human papillomavirus (HPV-16). The purified univalent antibody fragments bind to a double-stranded DNA oligonucleotide corresponding to the E2 binding site in solution with dissociation constants in the low and subnanomolar range. This affinity matches that of the natural DNA binding domain and is severalfold higher than the affinity of a homologous bovine E2 C-terminal domain (BPV-1) for the same DNA. These antibodies discriminate effectively among a number of double- and single-stranded synthetic DNAs with factors ranging from 125- to 20,000-fold the dissociation constant of the specific DNA sequence used in the immunogenic protein-DNA complex. Moreover, they are capable of fine specificity tuning, since they both bind less tightly to another HPV-16 E2 binding site, differing in only 1 base pair in a noncontact flexible region. Beyond the relevance of obtaining a specific anti-DNA response, these results provide a first glance at how DNA as an antigen is recognized specifically by an antibody. The accuracy of the spectroscopic method used for the binding analysis suggests that a detailed mechanistic analysis is attainable.Fil: Cerutti, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Centeno, Juan M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Goldbaum, Fernando Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; ArgentinaFil: de Prat Gay, Gonzalo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentin

Afecciones respiratorias superiores en aves de criaderos de Mendoza

En los últimos meses de 2010 criaderos de gallinas de la provincia de Mendoza padecieron afecciones respiratorias superiores de características agudas. La incidencia fue alta, siendo muy baja la letalidad de los casos. Se presenta la metodología de trabajo utilizada para diagnóstico virológico, bacteriológico y micológico, junto a los resultados hallados

FKBP12 Activates the Cardiac Ryanodine Receptor Ca2+-Release Channel and Is Antagonised by FKBP12.6

Changes in FKBP12.6 binding to cardiac ryanodine receptors (RyR2) are implicated in mediating disturbances in Ca2+-homeostasis in heart failure but there is controversy over the functional effects of FKBP12.6 on RyR2 channel gating. We have therefore investigated the effects of FKBP12.6 and another structurally similar molecule, FKBP12, which is far more abundant in heart, on the gating of single sheep RyR2 channels incorporated into planar phospholipid bilayers and on spontaneous waves of Ca2+-induced Ca2+-release in rat isolated permeabilised cardiac cells. We demonstrate that FKBP12 is a high affinity activator of RyR2, sensitising the channel to cytosolic Ca2+, whereas FKBP12.6 has very low efficacy, but can antagonise the effects of FKBP12. Mathematical modelling of the data shows the importance of the relative concentrations of FKBP12 and FKBP12.6 in determining RyR2 activity. Consistent with the single-channel results, physiological concentrations of FKBP12 (3 µM) increased Ca2+-wave frequency and decreased the SR Ca2+-content in cardiac cells. FKBP12.6, itself, had no effect on wave frequency but antagonised the effects of FKBP12

Captage du dioxyde de carbone par cristallisation de clathrate hydrate en présence de cyclopentane : Etude thermodynamique et cinétique

CO2 separation and capture by clathrate hydrate crystallization is a non-conventional way of trapping and storing gas molecules from flue gases. Clathrates hydrates are non-stoichiometric ice-like crystalline solids consisting of a combination of water molecules and suitable guest molecules. Mixed hydrates of cyclopentane (CP) + gas have been studied in one national project (FUI ACACIA) and a European program (iCAP). Cyclopentane is an organic additive which forms mixed hydrates of CP + CO2 + N2 at low pressure and moderate temperature. The equilibrium pressure is decreasing up to 97 % (relative to the equilibrium pressure without cyclopentane). CO2 selectivity in hydrates is enhanced and gas storage capacity approaches a roughly constant value of 40 m3gas (STP) /m3hydrate. Crystallization of CP + CO2 mixed hydrates seems limited by gas diffusion through the gas / liquid interface, which gets in the way of the determination of the intrinsic kinetic constants of crystallization. Experimental studies have also been investigated in presence of a Focused Beam Reflectance Measurements (FBRM) probe in stable emulsion of CP in water. FBRM probe can successfully identify hydrate nucleation. The sharp change in the mean chord length and the spread of Chord Length Distribution (CLD) are related to the progressive disappearance of the CP droplets in favor of the CP + CO2 mixed hydrates formation. The change in the mean chord length distribution is not only related to the agglomeration phenomenon of the particles but also to the occurrence of the shrinking core crystallization of the CP droplets.Le CO2 est capté par formation de clathrates hydrates sous l’action d’un promoteur de cristallisation thermodynamique. Les clathrates hydrates sont des composés d’inclusion non stœchiométriques formés de molécules d’eau organisées en réseau de cavités piégeant des molécules de gaz. Ce procédé de captage consiste à piéger de façon sélective le dioxyde de carbone dans les cavités des clathrates hydrates et à le séparer ainsi des autres gaz. Les hydrates mixtes de cyclopentane (CP) + gaz ont été étudiés dans le cadre du projet FUI ACACIA et du projet européen ICAP. Les premières expériences se sont focalisées sur l’étude des équilibres quadri phasiques (gaz CO2/N2, eau liquide, cyclopentane liquide et hydrate). Le cyclopentane est un promoteur thermodynamique qui forme des hydrates mixtes de CO2 + N2 + CP à basse pression et température modérée. La pression d’équilibre des hydrates mixtes est réduite jusqu’à 97% par rapport à la pression d'équilibre initiale des hydrates de gaz. La sélectivité de captage du CO2 dans les hydrates mixtes est augmentée et le volume de gaz stocké est de 40 m3gaz/m3hydrate. Une seconde étude expérimentale, conduite en présence d’une sonde FBRM (Focused Beam Reflectance Measurements) et d’une émulsion stable directe de CP/eau, a montré que la cinétique de cristallisation des hydrates mixtes de CP + CO2 est limitée par la diffusion du gaz à l’interface gaz/liquide. La sonde FBRM permet de détecter parfaitement l’apparition de la nucléation. Le changement de profil de la distribution en longueurs de corde (CLD) est non seulement lié à l’apparition des mécanismes de cristallisation (dont l’agglomération) mais aussi à la disparition des gouttes de CP au profit des hydrates qui cristallisent par un mécanisme à cœur rétrécissant

Carbon dioxide capture by clathrate hydrate crystallization in presence of cyclopentane : Kinetics and thermodynamics study.

Le CO2 est capté par formation de clathrates hydrates sous l’action d’un promoteur de cristallisation thermodynamique. Les clathrates hydrates sont des composés d’inclusion non stœchiométriques formés de molécules d’eau organisées en réseau de cavités piégeant des molécules de gaz. Ce procédé de captage consiste à piéger de façon sélective le dioxyde de carbone dans les cavités des clathrates hydrates et à le séparer ainsi des autres gaz. Les hydrates mixtes de cyclopentane (CP) + gaz ont été étudiés dans le cadre du projet FUI ACACIA et du projet européen ICAP. Les premières expériences se sont focalisées sur l’étude des équilibres quadri phasiques (gaz CO2/N2, eau liquide, cyclopentane liquide et hydrate). Le cyclopentane est un promoteur thermodynamique qui forme des hydrates mixtes de CO2 + N2 + CP à basse pression et température modérée. La pression d’équilibre des hydrates mixtes est réduite jusqu’à 97% par rapport à la pression d'équilibre initiale des hydrates de gaz. La sélectivité de captage du CO2 dans les hydrates mixtes est augmentée et le volume de gaz stocké est de 40 m3gaz/m3hydrate. Une seconde étude expérimentale, conduite en présence d’une sonde FBRM (Focused Beam Reflectance Measurements) et d’une émulsion stable directe de CP/eau, a montré que la cinétique de cristallisation des hydrates mixtes de CP + CO2 est limitée par la diffusion du gaz à l’interface gaz/liquide. La sonde FBRM permet de détecter parfaitement l’apparition de la nucléation. Le changement de profil de la distribution en longueurs de corde (CLD) est non seulement lié à l’apparition des mécanismes de cristallisation (dont l’agglomération) mais aussi à la disparition des gouttes de CP au profit des hydrates qui cristallisent par un mécanisme à cœur rétrécissant.CO2 separation and capture by clathrate hydrate crystallization is a non-conventional way of trapping and storing gas molecules from flue gases. Clathrates hydrates are non-stoichiometric ice-like crystalline solids consisting of a combination of water molecules and suitable guest molecules. Mixed hydrates of cyclopentane (CP) + gas have been studied in one national project (FUI ACACIA) and a European program (iCAP). Cyclopentane is an organic additive which forms mixed hydrates of CP + CO2 + N2 at low pressure and moderate temperature. The equilibrium pressure is decreasing up to 97 % (relative to the equilibrium pressure without cyclopentane). CO2 selectivity in hydrates is enhanced and gas storage capacity approaches a roughly constant value of 40 m3gas (STP) /m3hydrate. Crystallization of CP + CO2 mixed hydrates seems limited by gas diffusion through the gas / liquid interface, which gets in the way of the determination of the intrinsic kinetic constants of crystallization. Experimental studies have also been investigated in presence of a Focused Beam Reflectance Measurements (FBRM) probe in stable emulsion of CP in water. FBRM probe can successfully identify hydrate nucleation. The sharp change in the mean chord length and the spread of Chord Length Distribution (CLD) are related to the progressive disappearance of the CP droplets in favor of the CP + CO2 mixed hydrates formation. The change in the mean chord length distribution is not only related to the agglomeration phenomenon of the particles but also to the occurrence of the shrinking core crystallization of the CP droplets