In the Italian peninsula leucite-free and -bearing ultrapotassic rocks occur intimately associated but well separated in time. Silica-saturated ultrapotassic and associated shoshonitic magmas erupted during the Pliocene to Lower Pleistocene. Silica under-saturated leucite-bearing ultrapotassic r...

Practical implementation of anion exchange membranes (AEMs) having N-cyclic quaternary ammonium (QA) in alkaline fuel cells is demonstrated. Two kinds of QAs are incorporated along PPO backbone, including six-membered (DMP) and bis-six-membered N-cyclic QA (ASU). PPO-ASU membranes with bulky rin...

In this study, a series of novel visible light driven n-CeO2/n-CdO heterojunction (CeO2/CdO) nanocomposites were successfully fabricated by simple ultrasonication method. Several characterization tools including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron m...

The aim of this study was to provide a crystallographic and electronic analysis of a zinc(II)-azide complex with a N,N,S-tridentate thiosemicarbazone ligand. The characterization was performed by single-crystal X-ray diffraction, elemental analysis and FT-IR spectroscopy. This compound showed a ...

The aim of this work was to evaluate the vermicompost humic acid (HA) stimulatory effects on the N-uptake kinetics and the N metabolism of rice plants under high and low N-NO3- or N-NH4+ supply in nutrient solution. Plants were grown in a growth chamber, and at 21 days after germination, they we...

We prove a combination theorem for PD(n)-pairs.

In this work we numerically calculate cross sections of the reactions 6Li(n,n′γ)6Li and 7Li(n,n′γ)7Li reactions in the region of neutron kinetic energy En=0.5−20 MeV. Neutron-nucleus interaction is defined in terms of the three-body problem wherein the target-nucleus is a bound two-body syst...

We classify gradings by arbitrary abelian groups on the classical simple Lie superalgebras P(n), n≥2, and on the simple associative superalgebras M(m,n), m,n≥1, over an algebraically closed field: fine gradings up to equivalence and G-gradings, for a fixed group G, up to isomorphism. As a coro...

We introduce a handle-inserting operation in order to construct a minimum genus embedding of the tripartite graph Kn,n,1 for odd n. The construction is used to solve the conjecture of Kurauskas that for odd  n, Kn,n has an embedding of genus ⌈(n−1)(n−2)∕4⌉, such that one face is bounded by a Ha...

A novel N,N',N',1-tetraacetyl-4,6-dimethoxy-1H-indole-2-carbohydrazide 5, bearing four N-acetyl groups (N-COCH3) as cation binding sites was successfully synthesized by the reaction of readily available 4,6-dimethoxy-1H-indole-2-carbohydrazide 4 with acetic anhydride in dimethyl formam...

High activity and selectivity of the hierarchical H-Ymmm zeolite in the synthesis of practically important pyridines (by interaction of C2–C4 alcohols with formaldehyde and ammonia, cyclocondensation of acetaldehyde and propanal with ammonia), dialkyl quinolines (by reaction of aniline with ald...

1-Phenyl 1 (1-benzyl-1H-tetrazol 5-yl)hydrazine has been synthesised from N1-benzyloxycarbonyl-N2-phenylhydrazide and benzyl isothiocyanate. Coupling with N-(benzyloxycarbonyl)-L-serine 3,4-dihydro-4-oxo 1,2,3-benzotriazin 3-yl ester and cyclisation of the product, using triphenyl phosphine and ...

In order to prove the hypothesis that humans and animals with adequate vitamin A status do not absorb and metabolize orally administered all-trans retinoyl β-glucuronide, unlabeled retinoyl glucuronide (0.1 mmol) was orally dosed to fasting well-nourished young men. Neither retinoyl glucuronide...

All‐trans‐retinoyl‐β‐D‐glucuronide (RAG) is an endogenous active metabolite of all‐trans‐retinoic acid (ATRA). In the present study, the pharmacokinetics of RAG was examined after the administration of a single intravenous does (5, 10, or 15 μmol/kg) and of multiple daily intravenous do...

After the subcutaneous injection of retinoyl β-glucuronide (RAG), both RAG and retinoic acid (RA), formed by the hydrolysis of RAG in vivo, achieved peak plasma concentrations within 1–2 h. Thereafter, RA was rapidly cleared from the plasma whereas RAG was eliminated much more slowly. No signi...

The thymus is a target organ of retinoid teratogens. Retinoids with a generally reduced teratogenic potency should therefore also exert reduced adverse effects on thymus development. The effects of all-trans-retinoic acid (a-tRA) and all-trans-retinoyl-β-glucuronide (a-tRAG) on the in vitro dev...

All-trans-retinoic acid is metabolized in vitro to a biologically active metabolite, retinoyl-β-glucuronide. We have studied the synthesis of this metabolite in vitro. The identity of the product was established by cochromatography on reverse-phase high-performance liquid chromatography, β-d-g...

Retinol and retinyl esters are converted with time to slowly increasing amounts of all-trans retinoic acid (RA) in cultured human keratinocytes. Exogenous RA has been shown to limit retinol oxidation and to increase retinol esterification. Because significant amounts of retinol are present in bi...

All-trans retinoyl fluoride was prepared by treating all-trans retinoic acid with diethylaminosulfurtrifluoride. The crystalline product, which was characterized by melting point, infrared, 1H-NMR, 19F-NMR and elementary analysis, showed λmax at 382 nm in hexane (ε = 4.98·104 M−1·cm−1) and a...

Orally administered all-trans retinoyl β-glucuronide, after its absorption from the intestine, is distributed widely in the tissues, except for brain, of both vitamin A-sufficient (A+) and vitamin A-deficient (A−) rats. Although the digestion and rate of absorption of retinoyl β-glucuronide ar...