26 research outputs found
The Effects of Social Networking Services on Tourists’ Intention to Visit Mega-Events during the Riyadh Season: A Theory of Planned Behavior Model
The economic, cultural and environmental benefits of mega-events justify conducting tourism research articles based on tourists’ intention to visit the event destination. These decisions are likely influenced by behavioral attributes and social interaction. In the current study, we assessed potential predictors of tourists’ intention to visit the Riyadh Season using a theory of planned behavior (TPB) model and three variables of social networking service (SNS) variables, including SNS use, SNS content and trip experience sharing (TES). Results showed that the perceived behavioral control and subjective norms were antecedent TPB predictors of participants’ intentions to visit the destination. Additionally, the benefits of SNS content in organizing/planning events were independently associated with behavioral motivations. SNS attributes were not significant moderators of the relationship between subjective norms and tourists’ intentions. National authorities are required to focus on improving the content of SNS while planning for future mega-events to enrich tourists’ experience and support their motivation and decision
The Effects of Social Networking Services on Touristsâ Intention to Visit Mega-Events during the Riyadh Season: A Theory of Planned Behavior Model
The economic, cultural and environmental benefits of mega-events justify conducting tourism research articles based on touristsâ intention to visit the event destination. These decisions are likely influenced by behavioral attributes and social interaction. In the current study, we assessed potential predictors of touristsâ intention to visit the Riyadh Season using a theory of planned behavior (TPB) model and three variables of social networking service (SNS) variables, including SNS use, SNS content and trip experience sharing (TES). Results showed that the perceived behavioral control and subjective norms were antecedent TPB predictors of participantsâ intentions to visit the destination. Additionally, the benefits of SNS content in organizing/planning events were independently associated with behavioral motivations. SNS attributes were not significant moderators of the relationship between subjective norms and touristsâ intentions. National authorities are required to focus on improving the content of SNS while planning for future mega-events to enrich touristsâ experience and support their motivation and decision
Influence of the Metal (Al, Cr, and Co) and Substituents of the Porphyrin in Controlling Reactions Involved in Copolymerization of Propylene Oxide and Carbon Dioxide by Porphyrin Metal(III) Complexes. 3. Cobalt Chemistry
A series of cobaltÂ(III)
complexes LCoX, where L = 5,10,15,20-tetraphenylporphyrin (TPP), 5,10,15,20-tetrakisÂ(pentafluorophenyl)Âporphyrin
(TFPP), and 2,3,7,8,12,13,17,18-octaethylporphyirn (OEP) and X = Cl
or acetate, has been investigated for homopolymerization of propylene
oxide (PO) and copolymerization of PO and CO<sub>2</sub> to yield
polypropylene oxide (PPO) and polypropylene carbonate (PPC) or propylene
carbonate (PC), respectively. These reactions were carried out both
with and without the presence of a cocatalyst, namely, 4-dimethylaminopyridine
(DMAP) or PPN<sup>+</sup>Cl<sup>â</sup> (bisÂ(triphenylphosphine)Âiminium
chloride). The PO/CO<sub>2</sub> copolymerization process is notably
faster than PO homopolymerization. With ionic PPN<sup>+</sup>Cl<sup>â</sup> cocatalyst the TPPCoOAc catalyst system grows two
chains per Co center and the presence of excess [Cl<sup>â</sup>] facilitates formation of PC by two different backbiting mechanisms
during copolymerization. Formation of PPC is dependent on both [Cl<sup>â</sup>] and the CO<sub>2</sub> pressure employed (1â50
bar). TPPCoCl and PO react to form TPPCoÂ(II) and ClCH<sub>2</sub>CHÂ(Me)ÂOH,
while with DMAP, TPPCoCl yields TPPCoÂ(DMAP)<sub>2</sub><sup>+</sup>Cl<sup>â</sup>. The reactions and their polymers and other
products have been monitored by various methods including react-IR,
FT-IR, GPC, ESI, MALDI TOF, EXAFS, and NMR (<sup>1</sup>H, <sup>13</sup>CÂ{<sup>1</sup>H}) spectroscopy. Notable differences are seen in these
reactions with previous studies of (porphyrin)ÂMÂ(III) complexes (M
= Al, Cr) and of the (salen)ÂMÂ(III) complexes where M = Cr, Co
Melatonin Protects Against Rotenone-induced Oxidative Stress in a Hemiparkinsonian Rat Model
In the present study, we evaluated the effect of melatonin, a wellknown free radical scavenger and neuroprotector, against rotenone-induced oxidative stress in a hemiparkinsonian rat model. The effect of melatonin on
glutathione (GSH) depletion caused by unilateral, intranigral infusion of rotenone was investigated employing a spectrofluorimetric procedure. We also studied the effect of melatonin on rotenone-induced changes in the antioxidant enzymes superoxide dismutase (SOD) and catalase in the
cytosolic fractions of substantia nigra (SN), employing spectrophotometric procedures. Rotenone-induced hydroxyl radicals (âąOH) in the isolated mitochondria, as measured employing a sensitive HPLC-electrochemical
method, were significantly scavenged by melatonin. Melatonin treatment restored the rotenone-induced decrease in GSH level and changes in antioxidant enzyme (SOD and catalase) activities in the SN. Our results
strongly indicate melatoninâs beneficial use in Parkinsonâs disease therapy as an antioxidant