1000 resultados para Ultra-som tridimensional
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Deficiency of micronutrients is a public health problem. Cow milk is a source of retinol. The objective of this study is to evaluate the retinol concentration in milk commercialized in Natal/RN. Ten samples were taken of each brand of UHT milk. Vitamin content was determined by HPLC using the Shimadzu LC-10 AD Chromatograph, coupled to the Shimadzu SPD 10 A UV-VIS Detector and the Shimadzu C-R6A Chromatopac Integrator with Shim-pack CLC-ODS (M) column, measuring 4.6 mm x 25 cm. The mobile phase was 100% methanol, with a flow of 1 mL/min. The mean retinol concentration varied between 22.7 ± 4.9 µg/100 mL and 44.1 ± 4.1 µg/100 mL, with the differences statistically significant (p<0.001). Only one of the 7 brands had retinol concentration below the normal requirements for human consumption.
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Invocatio: I.J.N.
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Invocatio: I.J.N.
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Invocatio: I.J.N.
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Ultra Performance Liquid Chromatography (UPLC) retains the same principles as High Performance Liquid Chromatography (HPLC), but uses 1-2.1 mm i.d. columns with sub-2 µm particles. It is considered the newest advance in analytical separation science. The use of these small particles with mobile phases at high linear velocities increases resolution and detectability and decreases analysis time. Thus, the analyses are faster, the solvent volume is smaller, the efficiency is higher and the detectability is 2-3 times higher when compared with HPLC analysis.
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Invocatio: I.J.N.
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Invocatio: Med Guds Hjelp.
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Invocatio: Med Guds wälsignande nåd och wederbörandes tilstånd yttrade tankar.
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Inv: Med Guds Hjelp.
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Painovuosi nimekkeestä.
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Ajankohtaista
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Kuvateos sisältää viisi painokuvaa Rudolf Waldemar Åkerblomin piirustuksista, jotka ovat tallentaneet 1800-luvun lopulla katoamassa ollutta Helsinkiä: Katajanokan puutaloja ja vinoon painuneita hökkeleitä.
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Ajankohtaista
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Recension.
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Soitinnus: lauluääni, piano.