The accessibility of the nervous system of Manduca sexta to horseradish peroxidase and lanthanum during metamorphosis has been studied. In the fifth instar larva, peroxidase penetrates the thick neural lamella but does not reach the perineurium. In the first week after larval-pupal ecdysis, when the intercellular channels between hypertrophied perineurial I cells are the least tortuous, the enz...

Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied i...

Sarcolemmal membranes prepared by "gas dissection" from monolayers of cultured neonatal rat heart cells were studied with respect to their ability to bind calcium. Lanthanum displacement of calcium was 168 +/- 7 nmol/mg sarcolammel protein. This represents 3.21 mmol Ca/kg dry weight original cells on the basis of the measured membrane protein: dry cell weight ratio of 19.1 g/kg. Lanthanum-displ...

Freeze-fracture studies have shown a network of intramembrane fibrils in the tight junctions of epithelia. A direct correlation between the number of fibrils and junctional permeability has been suggested by previous studies. However, we have made two groups of observations showing that junctional permeability is not univocally related to the complexity of the network revealed by freeze-fractur...

L.R. BUSH, D.W. HAACK, M. SHLAFER and B. LUCCHESI, Protective effects of ~-adrenergic blockade in isolated ischemic hearts, EuroPean J. Pharmacol. 67 (1980) 209--217. The protective effects of the fl-adrenergic blocking drugs, propranolol and atenolol, were tested in a model of global ischemia and assessed electron microscopically. Cat isolated hearts were perfused retrogradely with arterial bl...

Transepithelial movement of water and solute occurs both through the cell membrane as well as across the intercellular junctional complex (paracellular shunt pathways). Permeability of paracellular shunt pathways is increase by transmucosal osmotic gradients, and in certain epithelia these changes are associated with bullous-like deformations (blisters) of the zonula occludens and localization ...

In neutral media, reactions of gadolinium ethylenediaminetetraacetates with phosphorous acid result in the formation of the mixed-ligand polymeric complex K3n[Gd(EDTA)(HPO3)]n·7nH2O () and dimeric complex Na6[Gd2(EDTA)2(HPO3)2]·2.5NaCl·21H2O () (H4EDTA = ethylenediaminetetraacetic acid) in warm solution. Further substitution with citric acid gives the monomeric gadolinium citrate with EDTA (NH4...

an improved, simple, and facile synthesis of 3,4-dihydropyrimidin-2(1h)-ones by employing three-component, one-pot condensation reaction of β-keto ester, aromatic aldehydes, and urea or n-methylurea using lacl3/clch2cooh as an inexpensive and green chemistry catalyst system under solvent-free conditions described. compared with the classicalbiginelli reaction conditions, this method has the adv...