The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g.sup.1, and stable cycling for more than 50 deep cycles at 0.1 C.

The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g.sup.1, and stable cycling for more than 50 deep cycles at 0.1 C.

The invention describes novel 14-hydroxy docosahexaenoic acid (DHA) analogues, their preparation, isolation, identification, purification and uses thereof.

The invention describes novel 14-hydroxy docosahexaenoic acid (DHA) analogues, their preparation, isolation, identification, purification and uses thereof.

The present invention relates to a process for the preparation of oxirane compounds of formula II from keto compounds III using dimethyl sulfide (CH.sub.3).sub.2S and dimethylsulfate (CH.sub.3).sub.2SO.sub.4, forming the reagent IV, trimethylsulfonium methylsulfate [(CH.sub.3).sub.3S.sup.+CH.sub.3SO.sub.4.sup.], in aqueous solution in the presence of potassium hydroxide (KOH).

The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g.sup.1, and stable cycling for more than 50 deep cycles at 0.1 C.

The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g.sup.1, and stable cycling for more than 50 deep cycles at 0.1 C.

The invention describes novel 14-hydroxy docosahexaenoic acid (DHA) analogues, their preparation, isolation, identification, purification and uses thereof.

The invention describes novel 14-hydroxy docosahexaenoic acid (DHA) analogues, their preparation, isolation, identification, purification and uses thereof.

The invention describes novel 14-hydroxy docosahexaenoic acid (DHA) analogues, their preparation, isolation, identification, purification and uses thereof.