NO熏蒸调控冷藏枸杞鲜果活性氧代谢减轻褐变

为探明NO熏蒸降低冷藏枸杞鲜果活性氧代谢减轻褐变,以“宁杞七号”枸杞鲜果为试验材料,采用300 μL/L（0 μL/L NO为对照）的NO气体对“宁杞七号”熏蒸处理3 h,贮藏于3±0.5 ℃条件。结果表明：NO熏蒸处理能显著抑制枸杞鲜果褐变度的上升（p<0.05）。在贮藏末期,NO熏蒸处理组枸杞鲜果还原型谷胱甘肽（GSH）含量、过氧化物酶（POD）及超氧化物歧化酶（SOD）活力分别较对照组高32.65%、0.03%、0.21%;氧化型谷胱甘肽（GSSG）、过氧化氢（H2O2）含量、超氧阴离子（O2-）生成速率及过氧化氢酶（CAT）活力分别较对照组低18.97%、28.21%、42.99%、0.08%;与贮藏第0 d相比,对照组抗坏血酸过氧化物酶（APX）活力上升5.33%,处理组下降29.39%,对照组谷胱甘肽还原酶（GR）活力下降31.52%,处理组上升1.22%。且在整个贮藏过程中,NO处理组枸杞鲜果中还原型抗坏血酸（ASA）含量及GSH/GSSG值均显著高于对照组（p<0.05）。综合以上结果说明,300 μL/L NO熏蒸处理加快了活性氧自由基清除速率,维持细胞膜的完整性,从而延缓了枸杞鲜果的褐变进程。     

难溶含铀碱渣氧化焙烧酸浸试验研究

为了回收难溶渣中的铀,对难溶渣进行了氧化焙烧预处理,研究了预处理工艺参数对难溶渣中铀浸出效果的影响。结果表明,难溶渣原样粒度-0.074 mm、焙烧温度1000 ℃、焙烧时间2 h条件下氧化焙烧预处理,所得焙烧渣再经硝酸浸出,铀浸出率为91.65%、渣铀品位为0.192%,渣剩余率为78.86%。试验结果可为现场处理难溶渣提供技术指导。     

SCR of NO over Ir/Al2O3 Catalysts. Importance of the Activation Procedure and Influence of the Dispersion

For SCR of NO the study of Ir/Al₂O₃ solids shows the importance of the activation procedure under mixtures containing CO (NO–C₃H₆–CO–O₂ or NO–CO–O₂). The selective reductant remains C₃H₆, however. The activation goes with an iridium particles sintering without Ir loss.     

New Evidence for Cross Talk between Melatonin and Mitochondria Mediated by a Circadian-Compatible Interaction with Nitric Oxide

Extending our previous observations, we have shown on HaCat cells that melatonin, at ~10⁻⁹ M concentration, transiently raises not only the expression of the neuronal nitric oxide synthase (nNOS) mRNA, but also the nNOS protein synthesis and the nitric oxide oxidation products, nitrite and nitrate. Interestingly, from the cell bioenergetic point of view, the activated NO-related chemistry induces a mild decrease of the oxidative phosphorylation (OXPHOS) efficiency, paralleled by a depression of the mitochondrial membrane potential. The OXPHOS depression is apparently balanced by glycolysis. The mitochondrial effects described have been detected only at nanomolar concentration of melatonin and within a time window of a few hours’ incubation; both findings compatible with the melatonin circadian cycle.     

AMS在硝酸N_2O减排项目中的应用

介绍了硝酸装置N2O减排项目中的自动监测系统（AMS）在实际生产的运用,阐述了AMS中各部分功能和信号传输与现有装置进行对接的方式,提出了具体实施中出现问题的解决方案。     

硝镁法浓硝酸装置加热器使用寿命的延长方法

介绍了硝镁法浓硝酸装置及其硝酸镁加热器的基本情况，通过对浓缩塔和加热器的改造，调整生产控制，从而延长了加热器的使用寿命。     

Involvement of Nitric Oxide in Sexual Learning via Action in the Medial Preoptic Area: Theoretical Comment on Lagoda et al. (2004).

Repeated exposure to female-related stimuli causes functional alterations in the neural circuitry mediating male rat sexual behavior. In a study published in the current issue of this journal, G. M. Lagoda, J. W. Muschamp, A. Vigdorchik, and E. M. Hull (2004; see record 2004-21410-017) provide interesting new evidence as to the mechanisms responsible for this effect, namely via activity of nitric oxide (NO) in the medial preoptic area. Given the history of NO in mediating neural plasticity in other systems, the results point to common mechanisms of plasticity between the processes underlying acquisition of sexual experience and those involved in learning and memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of sulfite on reduction kinetics of Fe(III)NTA chelate

The reduction of Fe(III)NTA (ferric ion coordinated to nitrilotriacetic acid) by sulfite has been found to be first-order with respect to Fe(III)NTA and of order minus one with respect to Fe(II)NTA (one of the reaction products). The order of reaction with respect to HSO^?₃ has been determined to be unity when the molar ratio of Na₂SO₃ to total Fe(III) is less than five. In this paper, the role of sulfite in the reduction scheme is reconsidered, and the reduction rate expression in which the coordination of Fe³⁺ to HSO^?₃ is incorporated, is newly presented. The proposed rate equation covers all reaction data for molar ratios of Na₂SO₃ to total Fe(III) in the range of 1 to 25.     

Evolution of the organic sulfur and other components during nitric acid leaching of Mequinenza coal

In this work, desulfurization by nitric acid leaching is studied in Mequinenza coal, whose characteristics are very low contents of sulfide and sulfate sulfurs in comparison with a very high content of organic sulfur that allows the selective attack on organic sulfur with regard to carbon to be clearly determined. Organic matter is made soluble at high temperatures and there is a threshold temperature for the same. The reaction involves an increase of nitrogen and oxygen, and a decrease of carbon contents. These variations reach a limit as the solubility of the organic matter progresses. The attack on inorganic sulfur is very fast, producing an initial leap as in the attack on organic sulfur, while the solubilization of organic matter is slower, because of which shorter times should be applied for the purpose of desulfurization.     

硝酸碳酰胺粉末酸化提高油井产能(英文)

酸化作业的效果取决于酸液的种类和活性酸对地层的侵入深度。选用粉末硝酸碳酸胺作为酸化基体，再配加盐酸、氢氟酸和表面活性剂配制的酸液进行酸化作业，试验结果表明，这种混合酸液不仅能增加活性酸对地层的侵入深度，而且能减少井下和地面石油设备的腐蚀。所用的工业粉末硝酸碳酰胺是种白色或黄色的不易燃物质，具有很好的水溶性，其密度为1746～1748kg／m3。作业时将其按一定的比例与无水原油或柴油相混，挤入地层的浓度达到5％～10％；所用盐酸的浓度为10％～20％。硝酸碳酰胺粉末技术适用于深井、高温、高压，酸化效率高，适用性好。应用结果表明，这项技术能大大提高油井的产量或注水井的注水量。