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  • Author: Daniela Mihalache x
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Abstract

The aim of the study was to assess the absorbtion degree of different nitrogen forms (ammonium, nitric, amidic) from soil into the plant by using nuclear techniques and 15N isotope as a tracer. In the same time, the effect of foliar fertilization on increasing the efficiency of nitrogen use by biostimulating the plant up-take was highlighted. Urea and ammonium nitrate labeled with 15N isotope (10% from total nitrogen content of the fertilizers being covered by 15N isotope) were incorporated in soil. In order to highlight the efficiency of foliar fertilization, fertilizers having NPK matrix with mezo and microelements and proteic organic compounds (animal and vegetal) were designed and obtained. The effects of experimental treatments on isotopic indicators (15N/14N isotopic rate, δ 15N isotopic accumulation degree, 15N isotope export, absorbtion degree of 15N isotope) from plant were assessed. The tested plant was maize (Cortes hybrid). The values obtained were statistically analyzed by using variance analyze, with two factors, Duncan test of multiple comparison, multiple comparison threshold α= 0.05. The results of agrochemical testing showed that the absorbtion degree of 15N isotope from soil into maize plant was highest for the amidic (N-NH2) form of the nitrogen comparing with the other forms (N-NO3, N-NH4).

Anthropometric Predictors of High Risk of Obstructive Sleep Apnea Syndrome in a Rural Population

Objective. To evaluate which anthropometric parameter better predicts the high risk of obstructive sleep apnea syndrome (OSA) in a rural population. Material and Method. 254 subjects were enrolled. We measured weight, height, waist circumference (WC) and neck circumference (NC) and calculated body mass index (BMI), waist-to-height ratio (WHtR) and neck circumference/height ratio (NC/Height). The risk of OSA was assessed by using Berlin Questionnaire. Results. Subjects with high risk of OSA had a significant higher BMI, WC, WHtR, NC, and NC/Height. A higher percentage of those with large WC (≥80cm and ≥94cm for women and men, respectively) (p<0.001), WHtR ≥0.5 (p<0.001), NC ≥40cm (p=0.004), NC/Height ratio ≥0.23 (p=0.002) had a high risk of OSA. Using ROC curves of anthropometric parameters studied we found that WHtR was the best predictor for high risk of OSA, with AUC of 0.760, 95% CI: 0.699 to 0.815. Conclusions. WHtR was the best predictor for high risk of OSA as assessed by the Berlin Questionnaire.

Abstract

Non-alcoholic fatty liver disease (NAFLD) is closely associated with all features of the metabolic syndrome (MS). This strongly supports the notion that NAFLD may be the hepatic manifestation of the MS. NAFLD is currently the most common cause of abnormal liver function tests and affects approximatively 15-25% of the general population. NAFLD covers a spectrum of liver disease, from steatosis to nonalcoholic steatohepatitis (NASH) and cirrhosis. Insulin resistance (IR) has central etiologic roles in the development of MS and NAFLD, usually related to obesity. MS is frequently associated with chronic inflammation, having as principal mediators the adipocytokines and free fatty acids (FFA), but also CRP, TNF-a and IL-6. Chronic inflammation results in more IR and lipolysis of adipose tissue triglyceride stores, in enhanced hepatic glucose and VLDL production. The steatotic liver is thought to be vulnerable to secondary injuries including adipocytokines, mitochondrial dysfunctions, oxidative stress which lead to hepatocellular inflammation and fibrosis.