Estudio bromatológico del maíz argentino

- Origen de la planta - Descripción de la misma - Elección de las muestras e identificación - Determinación de la composición química del maíz argentino - Estudio de las proteínas - Estudio de los hidratos de carbono - Cenizas - Comparación de resultados: maíces argentinos y extranjerosTesis digitalizada en SEDICI gracias a la Biblioteca Central de la Facultad de Ciencias Exactas (UNLP).Doctor en Ciencias BioquímicasUniversidad Nacional de La PlataFacultad de Ciencias Exacta

Estudio bromatológico del maíz argentino

- Origen de la planta - Descripción de la misma - Elección de las muestras e identificación - Determinación de la composición química del maíz argentino - Estudio de las proteínas - Estudio de los hidratos de carbono - Cenizas - Comparación de resultados: maíces argentinos y extranjerosTesis digitalizada en SEDICI gracias a la Biblioteca Central de la Facultad de Ciencias Exactas (UNLP).Doctor en Ciencias BioquímicasUniversidad Nacional de La PlataFacultad de Ciencias Exacta

Three Consecutive Pregnancies in a Patient with Chronic Autoimmune Thyroid Disease Associated with Hypothyroidism and Extremely High Levels of Anti-Thyrotropin Receptor Antibodies

International audienceBackground: Thyroid-stimulating hormone (TSH) receptor (TSHR) antibodies (TRAb) can be present in chronic autoimmune thyroiditis. Transplacental TRAb transfer can lead to fetal thyroid dysfunction and serious complications. Patient Findings: We report the case of a woman with autoimmune hypothyroidism and extremely high TRAb levels, with blocking and stimulating activities (biological activities characterized with Chinese hamster ovary cells expressing TSHR). At week 22 of her first pregnancy, sonography detected fetal growth retardation and cardiac abnormalities (extreme tachycardia, right ventricular dilatation, pericardial effusion). The mother's TRAb level, assayed later, was 4030 IU/L (n < 10). Delivered via caesarean section gestational week 30, the newborn girl had several malformations, signs of malnutrition, goiter and hyperthyroidism associated with elevated TRAb (1200 IU/L). The newborn died 26 days after delivery. Faced with persistently high TRAb levels and a desire to become pregnant again, the woman was treated with three consecutive 740-MBq activities of iodine-131, which resulted in a decrease in TRAb to 640 IU/L. The patient had two subsequent pregnancies 16 and 72 months after the radioiodine administration. During the close follow-ups, fetal development was normal, and initial TRAb levels during the two pregnancies were 680 and 260 IU/L, respectively, which initially decreased but then increased in late pregnancy. In both cases, labor was induced at 34 weeks. The newborns, mildly hyperthyroid at birth, required carbimazole treatment at days 5 and 2, respectively. The mild hyperthyroidism despite high TRAb levels was likely due to the concomitant presence of stimulating and blocking TRAb. The two girls, now aged 12 and 8 years, are in good health. The mother has no detectable thyroid gland tissue and is euthyroid on levothyroxine (175 μg/d). Her TRAb level gradually decreased to 136 IU/L. Summary and Conclusions: This remarkable case illustrates the severe consequences of untreated fetal hyperthyroidism and the need to assay and follow-up TRAb levels in women of reproductive age with autoimmune thyroiditis

Diagnosis and management of asymptomatic bacteriuria in kidney transplant recipients: a survey of current practice in Europe

International audienceBackgroundAsymptomatic bacteriuria is frequent in kidney transplant recipients (KTRs). However, there is no consensus on diagnosis or management. We conducted a European survey to explore current practice related to the diagnosis and management of asymptomatic bacteriuria in adult KTRs.MethodsA panel of experts from the European Renal Association–European Dialysis Transplant Association/Developing Education Science and Care for Renal Transplantation in European States working group and the European Study Group for Infections in Compromised Hosts of the European Society of Clinical Microbiology and Infectious Diseases designed this cross-sectional, questionnaire-based, self-administered survey. Invitations to participate were e-mailed to European physicians involved in the care of KTRs.ResultsTwo hundred and forty-four participants from 138 institutions in 25 countries answered the survey (response rate 30%). Most participants [72% (176/244)] said they always screen for asymptomatic bacteriuria in KTRs. Six per cent (15/240) reported never treating asymptomatic bacteriuria with antibiotics. When antimicrobial treatment was used, 24% of the participants (53/224) said they would start with empirical antibiotics. For an episode of asymptomatic bacteriuria caused by a fully susceptible microorganism and despite no contraindications, a majority of participants (121/223) said they would use a fluoroquinolone (n = 56), amoxicillin/clavulanic acid (n = 38) or oral cephalosporins (n = 27).ConclusionsScreening for and treating asymptomatic bacteriuria are common in KTRs despite uncertainties around the benefits and harms. In an era of antimicrobial resistance, further studies are needed to address the diagnosis and management of asymptomatic bacteriuria in these patients