Transferrin receptor (TfR) expression is regulated by iron at the level of mRNA stability through a factor (IRF/IRE-BP) which binds to specific iron-responsive elements (IRE). On the other hand, growth-dependent regulation of TfR expression is generally believed to be transcriptionally controlled. We analyzed the molecular mechanisms that control TfR gene expression at the onset of cell prolife...

We present a general study about the relation between the vorticity tensor and the Poynting vector of the electromagnetic field for axially symmetric stationary electrovacuum metrics. The obtained expressions allow to understand the role of the Poynting vector in the dragging of inertial frames. The particular case of the rotating massive charged magnetic dipole is analyzed in detail. In additi...

Iron oxide nanoparticles were synthesized by coprecipitation method using ammonia as precipitation agent. Most researchers usually add ammonia into the iron salt solution but in this work the salt solution drop wise has been added to the ammonia and the new obtained results were compared with those of other researches. Magnetic properties of nanoparticles were measured by VSM. The effect of rea...

Iron fortification has been used to enhance iron intake in many developed countries for more than 50 years, but only in the last decade has this strategy been applied on a large scale to other parts of the world. Iron fortification of rice is being instituted in the Philippines. Initially, the rice will be produced in government-controlled rice mills and sold at low cost mainly to low income fa...

BACKGROUND Repeated blood donation alters the iron balance of blood donors. We quantified these effects by analyzing changes in body iron as well as calculating iron absorbed per day for donors enrolled in a prospective study. STUDY DESIGN AND METHODS For 1308 donors who completed a final study visit, we calculated total body iron at the enrollment and final visits and the change in total bod...

Late Devonian black shale successions in the eastern US contain numerous discontinuities that are characterized by lags containing variable amounts of quartz sand mixed with reworked pyritic and phosphatic debris. These lags can be partially cemented by iron sulfides with a radial fibrous to massive morphology. Examination of iron sulfide cements via electron backscatter diffraction (EBSD) show...

A new procedure for the direct determination of picomolar levels of iron in seawater is presented. Cathodic stripping voltammetry (CSV) is preceded by adsorptive accumulation of the iron(III)-2,3-dihydroxynaphthalene (DHN) complex from seawater, containing 20 microM DHN at pH 8.0, onto a static mercury drop electrode, followed by reduction of the adsorbed species. The reduction current is catal...

A drop has been observed in the renal threshold for hemoglobin in dogs, of over 60 per cent, following repeated injections daily. It was not associated with a cessation of tubular reabsorption. Hemoglobin excretion rate curves, obtained initially and after lowering the threshold, have proved to be parallel lines originating at the respective levels. Hemoglobin containing radio-active iron has b...

In view of the erythroid hyperplasia found in the bone marrow of subjects with chronic iron deficiency anemia, the delayed appearance of reticulocytosis following iron therapy is unexplained. Profound disturbances were observed in some biochemical functions of the bone marrow cells isolated from such patients. There was a substantial decrease in the cellular nucleic acid content, associated wit...

Determination of the stability constants of dissolved iron(III) glycine system in water solution (I = 0.6 mol L in NaClO4, pH = 7.3 at 25±1 oC) using differential pulse cathodic voltammetry (DPCV) and cyclic voltammetry (CV) was performed out on a static mercury drop electrode (SMDE). By choosing voltammetry as analytical tool, measurements with lower iron(III) concentrations (10 mol L), at the...