Cytosolic pH (pHi) of pancreatic islet cells was assessed using the fluorescent dye 2'7'-biscarboxyethyl-5'(6')-carboxyfluorescein (BCECF). pHi was rapidly lowered by addition of the sodium salt of a weak acid or by treatment with amiloride. In the latter case, no recovery of...

Nanosized pure rubidium ferrites have been successfully prepared by thermal decomposition of rubidium hexa(carboxylato)ferrate(III) precursors, Rb3[Fe(L)6]·xH2O (L = formate, acetate, propionate, butyrate), in flowing air atmosphere from ambient temperature to 1000 °C. Various physico-chemical...

(2S)-Tyrosine (5) is incorporated stereospecifically into tuberin (1) with retention of the 3-pro-S proton and incomplete retention of the 2-S proton; a parallel pathway to the xanthocillin (4) is apparent with stereospecific retention of the 3-pro-R proton of tyrosine; results of experiments wi...

Four xanthocillins (1–4), including a new compound 4, were isolated from cultured marine fungus Basipetospora sp. as thrombopoietin (TPO) mimics. Compounds 1–4 promoted the proliferation of a TPO-sensitive human leukemia cell line, UT-7/TPO, and UT-7/EPO-mpl, genetically engineered to express ...

Potassium [14C, 13C, 15N]cyanide and [14C, 13C, 15N]-2-hydroxy-4-methylvalero-nitrile [as(5)] are incorporated into xanthocillin-X-monomethyl ether (1) but label appears only in the O-methyl group. The isocyanide functions of (1) are not labelled by [2 14C]-methionine. Potassium [14C]cyanate, [1...

Reactions of VCl3 · 3 THF with RMgX (R  Ph, CH2SiMe3, C6F5) in various ratios have been studied. The stable compounds R3V · THF (R  CH2SiMe3, C6F5) were obtained. The chemical properties of R3V · THF, R4V · 2 L (R  CH2Ph, L  Et2O; R  C6F5, L  THF) and (Me3SiCH2)4V were investigat...

The vanadium(II) halides [VCl2(H2O)4] and [V(H2O)6]Br2, prepared from the metal and the appropriate acid, combine with 1,2-bis(dimethylphosphino)ethane (dmpe) and 1,2-bis(diethylphosphino)ethane (depe) in methanol to give [VX2(dmpe)2] and [VX2(depe)2] (XCl or Br). The iodo complexes were obtai...

Most representatives of the halophilic arachaeobacterial genera Halobacterium, Haloarcula and Haloferax tested were able to reduce dimethylsulfoxide (DMSO) to dimethylsulfide (DMS) and trimethylamine N-oxide (TMAO) to trimethylamine (TMA) under (semi)anaerobic conditions. In most cases the reduc...

This paper presents one-pot synthesis of N,N,N-trimethyl chitosan (TMC) stabilized poly(methyl methacrylate) (PMMA) latex particles via the miniemulsion polymerization technique. From 1H NMR, synthesized TMC contains 52% degree of quaternization. Compared to native biopolymer chitosan, TMC posse...

High quality epitaxial layers of AlxGa1-xAs have been grown by reduced pressure MOVPE using the new aluminium precursor trimethylamine alane in combination with trimethylgallium and arsine. The layers were grown at 650°C and were shown to possess n-type conductivity for all aluminium compositio...

The crystal structure of (CH3)3Al·NC7H13 has been determined from single-crystal X-ray diffraction data collected by film techniques. The unit cell is monoclinic with a=8.94±0.02 Å, b=10.66±0.02 Å;, c=6.84±0.02 Å;, β=106° 19′±10′, and contains two formula units of the monomeric compound...

Aluminum–organic composite nanoparticles were synthesized by a modified Haber and Buhro’s process; ethylene glycol (EG) was used as solvent instead of 1,2,3-trimethyl benzene. The use of EG caused an extremely active reaction in the preparation of aluminum nanoparticles, and the subsequent pol...

The mechanism and kinetics of the thermal decomposition of trimethylamine alane (TMAA) on aluminum and silicon single crystal surfaces in ultrahigh vacuum are reported. The products obtained are elementally pure aluminum thin films and gas phase hydrogen and trimethylamine. On single crystal alu...

Nanofibers of p-type NiO/n-type ZnO heterojunction with different NiO content were fabricated by a facile electrospinning technique. The as-synthesized nanofibers were characterized by differential thermal analyzer (DTA) and thermal gravimetric analyzer (TGA), X-ray diffractometer (XRD), scannin...

A polyelectrolyte membrane with anti-ultraviolet, anti-fouling, and antibacterial abilities was prepared using trimethyl quaternary ammonium salt grafting lignin (QAL) and polystyrene (PS) at different ratios. Contact angle measurements indicated that the addition of QAL into the PS blending mem...

In2O3–SnO2 composite nanofibers are synthesized via an electrospinning method and coated with La0.7Sr0.3FeO3 nanoparticles. Trimethylamine sensors are fabricated from the coated nanofibers and investigated at various conditions of different humidity. High response and short response/recovery ti...

A stereospecific synthesis of dl-cyclopenin (1) is described corroborating previous structural and stereochemical assignments. The hippuric acid 10 was converted to cis ester 11 which was reduced and cyclized separately to cis and trans 3-benzylidene-4-methyl-1-H-1,4-benzodiazepin-2,5-diones 12 ...

Cyclopenin m-hydroxylase transforms cyclopenin, one of the two major alkaloids of Penicillium cyclopium, into cyclopenol. The enzyme belongs to the group of mixed function oxygenases. It needs molecular oxygen and a hydrogen donor (NAD(P)H, ascorbic acid, tetrahydropteridine) as cosubstrates, an...

Toxic primary aromatic amines (PAAs) are reaction products from residual isocyanates in polyurethane adhesives. The maximum migration level of the total sum of PAAs is 10 ng g−1 of food. This paper reports on a method for quantification of 18 PAAs by UHPLC–MS/MS that was optimised and applied t...

In this paper, two new thiols, [4-(9H-fluoren-9-ylmethyl)-phenyl]-methanethiol (6a) and [4-(2-nitro-9H-fluoren-9-ylmethyl)-phenyl]-methanethiol (6b), were synthesized, and self-assembled monolayers (SAMs) of these thiols were formed on gold electrodes. The structure and surface properties of mol...