Previous work has suggested that the lead (Pb) exposure-induced decrease in K(+)-evoked hippocampal glutamate (GLU) release is an important factor in the elevated threshold and diminished magnitude reported for hippocampal long-term potentiation (LTP) in exposed animals. In addition, complex dose-effect relationships between Pb exposure level and LTP have been reported. This investigation was c...

Simultaneous assay of blood lead (Pb-B) and red cell lead (Pb-Rbc) in 123 samples from 104 urban and suburban students, ages 10-18, shows the ratio of concentration (Pb-Rbc)/(Pb-B) to increase as the hematocrit decreases. On direct assay in 40 samples, plasma lead (Pb-P) was fixed in a narrow range. In 28 students with Pb-Rbc >40 mug/100 ml, the mean red cell 2,3-diphosphoglycerate (2,3-DPG) wa...

An absolute shielding scale is proposed for (207)Pb nuclear magnetic resonance (NMR) spectroscopy. It is based on ab initio calculations performed on an isolated tetramethyllead Pb(CH3)4 molecule and the assignment of the experimental resonance frequency from the gas-phase NMR spectra of Pb(CH3)4, extrapolated to zero density of the buffer gas to obtain the result for an isolated molecule. The ...

Two new one-dimensional (1-D) Pb(II) coordination polymers, namely, [Pb(3-pdip)(L)]·H2O (1) and [Pb(3-pdip)(L2)] (2) [LH2 = 1,6-hexanedioic acid, LH2 = homophthalic acid, 3-pdip = 2-(3-pyridyl)imidazo[4,5-f]1,10-phenanthroline] have been obtained from hydrothermal reactions of Pb(II) nitrate with the phenanthroline derivative and the two dicarboxylic acids. Single-crystal X-ray diffraction anal...

In the title compound, [Pb(2)(C(7)H(4)FO(2))(4)(H(2)O)(2)](n), one Pb(II) atom is coordinated by seven O atoms and one F atom from five 2-fluoro-benzoate ligands, and the other Pb(II) atom is coordinated by five O atoms from four 2-fluoro-benzoate ligands and three water mol-ecules, resulting in distorted PbO(7)F and PbO(8) polyhedra. The 2-fluoro-benzoate ligands bridge Pb atoms, giving rise t...

Introduction: Basaltic shergottite Queen Alexandra Range 94201 originated from an extremely depleted mantle source, and has the highest initial εNd (+ 47.6 ± 1.7) and the lowest initial Sr/Sr (0.701298 ± 14) measured for any martian meteorite to date [1]. Rb-Sr and Sm-Nd isochrons for this sample yield concordant crystallization ages of 327 ± 12 Ma and 327 ± 19 Ma, respectively [1]. Knowledge o...

The Pb(II) atom in the polymeric title compound, [Pb(C(8)H(4)O(4))(C(12)H(6)N(2)O(2))](n), is chelated by the N-heterocycle, and adjacent atoms are bridged by rigid terephthalate dianions into a linear chain. The Pb(II) atom is stereochemically active in a ψ-square-pyramidal coordination geometry in which the lone-pair electrons occupy a basal site. When three other weaker Pb⋯O inter-actions ar...

The fluctuations in pseudorapidity density are well described by Fritiof and IRIS, model for a bulk of the data at a few high multiplicity events remain unexplained. In these events, the estimated energy density is within the range of values predicated for the onset of the deconfinement phase transition. It is important to know whether fluctuations are, in fact, of statistical nature or geometr...

Biochar (BC) produced from agricultural crop residues has proven effective in sorbing organic contaminants. This study evaluated the ability of dairy-manure derived biochar to sorb heavy metal Pb and organic contaminant atrazine. Two biochar samples were prepared by heating dairy manure at low temperature of 200 degrees C (BC200) and 350 degrees C (BC350). The untreated manure (BC25) and a comm...

Male Wistar rats were exposed to 100ppm Pb(2+) in drinking water for 10 months. Tail blood pressure, serum 5-hydroxytryptamine (5-HT), the expression of 5-HT(2B) receptor in the aorta, the aortic response to 5-HT, and the pathologic changes of aorta were examined. The systolic blood pressure of Pb(2+) exposed group was significantly increased after 2 months of Pb(2+) exposure. After 10 months o...