We report here a series of heteroatom-substituted macrocycles containing an anthraquinone moiety as a fluorescent signaling unit and a cyclic polyheteroether chain as the receptor. Sulfur, selenium, and tellurium derivatives of 1,8-anthraquinone-18-crown-5 (1) were synthesized by reacting sodium sulfide (Na2S), sodium selenide (Na2Se) and sodium telluride (Na2Te) with 1,8-bis(2-bromoethylethyle...

It has been recorded that the increased erythrocyte sedimentation rate (ESR) of some pathological blood specimens, especially from patients with rheumatic fever, was decreased or abolished by incubation with certain preparations of hyaluronidase (1, 2). This effect was shown to be due to changes produced on the erythrocytes and not on the plasma (2) ; the erythrocytes were changed to spherocyte...

The reaction mechanism for the enzymatic conversion of methyl phosphonate to phosphate and methane in Escherichia coli has eluded researchers over the last three decades despite significant genetic and in vivo studies. The phn operon governs the C-P lyase activity in E. coli. The essential genes within the phn operon are phnGHIJKLM. The proteins encoded by phnGHM were over-expressed in E. coli ...

Tin sulfide−reduced graphene oxide (SnS2rGO) composite material is investigated as an advanced anode material for Na-ion batteries. It can deliver a reversible capacity of 630 mAh g−1 with negligible capacity loss and exhibits superb rate performance. Here, the energy storage mechanism of this SnS2-rGO anode and the critical mechanistic role of rGO will be revealed in detail. A synergistic mech...

Room-temperature sodium–sulfur (RT Na–S) batteries have attracted extensive attention because of their low cost and high specific energy. RT Na–S batteries, however, usually suffer from sluggish reaction kinetics, reversible capacity, short lifespans. Herein, it is shown that chain-mail catalysts, consisting porous nitrogen doped carbon nanofibers (PCNFs) encapsulating Co nanoparticles (Co@PCNF...

Porcine oocytes that have matured in in vitro conditions undergo the process of aging during prolonged cultivation, which is manifested by spontaneous parthenogenetic activation, lysis or fragmentation of aged oocytes. This study focused on the role of hydrogen sulfide (H2S) in the process of porcine oocyte aging. H2S is a gaseous signaling molecule and is produced endogenously by the enzymes c...

The synthesis of the first Cu2(m-S) complex, {(IPr*)Cu}2(m-S) (IPr* 1⁄4 1,3-bis(2,6-(diphenylmethyl)-4methylphenyl)imidazol-2-ylidene; 1), has been accomplished via three synthetic routes: (1) salt metathesis between (IPr*)CuCl and Na2S; (2) silyl-deprotection reaction between (IPr*)Cu(SSiMe3) and (IPr*)CuF; and (3) acid–base reaction between (IPr*)Cu(SH) and (IPr*)Cu(OBu). The X-ray crystal st...

The present work is concerned with sulfidation of Cu, Zn and Ni containing plating wastewater with CaS. The sulfidation experiments were carried out at a room temperature by adding solid CaS to simulated metal solution containing either single-metal of Ni, Zn and Cu, or Ni-Zn-Cu mixture. At first, the experiments were conducted without pH adjustment and it was found that the complete sulfidatio...

A kraft paper mill produces a steady waste stream of reacted inorganic chemicals and organic wastes called black liquor. Both monetary and environmental concerns demand that the inorganic chemicals and the organic byproducts are recycled. Currently recovery boilers are the standard means to recycle the inorganic chemicals and organic waste to produce a large fraction of the energy needed to ope...