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21.
Effects of the surface chemistry of macroreticular adsorbents on the adsorption of 1-naphthol/1-naphthylamine mixtures from water 总被引:1,自引:0,他引:1
ZHANG Wei-ming CHEN Jin-long CHEN Qun HE Min-yang PAN Bing-cai ZHANG Quan-xing 《环境科学学报(英文版)》2005,17(5):782-785
The adsorption behaviors of 1-naphthol, 1-naphthylamine and l-naphthol/l-naphthylamine mixtures in water over two macroreticular adsorbents were investigated in single or binary batch systems at 293 K, 303 K and 313 K respectively. All the adsorption isotherms in the studied systems can be adequately fitted by Langmuir model. In the case of aminated macroreticular adsorbent NDA103, 1-naphthol is adsorbed to a larger extent than 1-naphthylamine; while, the opposite trend is found for nonpolar macroreticular adsorbent NDA100. It is noteworthy that at higher temperature(303 K and 313 K), the total uptake amounts of 1-naphthol and 1-naphthylamine in all binary-component systems are obvious larger than the pure uptake amounts in single-component systems, which is presumably due to the cooperative effect primarily arisen from the hydrogen-bonding interaction between the loaded 1-naphthol and 1-naphthylamine molecules. The simultaneous adsorption systems were confirmed to be helpful to the selective adsorption towards 1-naphthol according to the larger selective index. 相似文献
22.
对呼吸计量法应用于校准ASM1作了简明的阐述。在呼吸速率与模型组分关系的基础上,介绍了ASM1中废水与污泥各组分浓度的测定方法,并指出模型组分细化的意义。 相似文献
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Stickler syndrome is an autosomal dominant disorder of the connective tissue which includes ocular and systemic manifestations. We report on a large kindred in which we were able to demonstrate very tight linkage between the disease and the type II collagen gene (COL2A1) (LOD score 3·91 at θ=0). In a family in which the father and one of his daughters were severely affected, DNA analysis from a chorionic villus sample demonstrated that the fetus possessed the normal allele of COL2A1. Thereafter a normal child was born. 相似文献
26.
Sean LIU 《环境科学学报(英文版)》2003,(6)
IntroductionTheconventionalmethodforsubsurfaceremediationofgroundwatercontaminationwithVOCsistheso called“pump and treat”technology .Thelimitationofthisapproachistheprohibitivelylongtreatmenttimeforremediatingthegroundwatercontaminatedwithcommonchlorinatedsolventsthathavedensitiesgreaterthanthatofwater(classifiedasDNAPLs densenon aqueousphaseliquids) .Thisislargelyduetotheverylowwatersolubilityandlowbiodegradabilityofthisclassofsolventsandthetendencyofthesolventssettlinginthebottomofanaqu… 相似文献
27.
毛细管气相色谱法分析1,3—丁二烯中炔烃杂质含量 总被引:2,自引:0,他引:2
介绍了一种毛细管毛相谱法测定1,3-丁烯中炔烃质含量的新试验方法,该方法以氮气为载气,采用氢火焰离子化检测器,样品经分离后,采用外标法定量,操作简便,准确。该方法还可用于1,3-丁二烯纯度分析 。 相似文献
28.
一个耐受镉毒害的拟南芥突变体的筛选 总被引:3,自引:0,他引:3
从甲基磺酸乙酯(EMS)诱变获得的拟南芥M2代群体(Columbia型)中筛选获得一个耐受镉Cd2 毒害能力显著增强的拟南芥突变体(命名为cdr1-1).遗传分析表明,该突变性状为隐性单基因突变,与野生型相比,cdr1-1突变体在不同发育时期均能耐受Cd2 毒害,且其对Cd2 的积累能力也显著高于野生型.此外,还发现cdr1-1突变体体内的还原型谷胱甘肽(GSH)水平显著高于野生型,用GSH合成抑制剂丁硫氨酸亚矾胺处理cdr1-1突变体,导致其耐受Cd2 毒害能力显著下降,几乎接近野生型水平,表明cdr1-1突变体对Cd2 的耐受性至少部分依赖于GSH介导的途径. 相似文献
29.
Tributyltin(TBT), an organometal used as an antifouling biocide, has been reported to induce masculinization of fish. Benzo [a]pyrene (BaP), a widespread carcinogenic polycyclic aromatic hydrocarbon, has been reported that its microsomal metabolites can produce an estrogenic response when tested in vitro. This study was therefore designed to examine the potential in vivo influence of TBT, BaP and their mixture on sex hormone levels in serum of Sebastiscus marmoratus, which were given 2 separate intraperitoneally (ip) injections(a single injection every 7 d) of TBT(0.5, 1, 5 and 10 mg/kg), BaP(0.5, 1, 5 and 10 mg/kg), or both in combination(0.5, 1, 5 and 10 mg/kg); control fish received olive oil vehicle only. Six days after the 2nd injection, serum samples were collected and analyzed for sex hormone levels and alkali labile protein phosphorus (ALPP), which is related to the yolk precursor protein vitellogenin. The pollutants at all doses significantly reduced serum testosterone, estradiol and ALPP content after 2 injections compared with the corresponding controls. The reduction of the estradiol levels should be response for the decrease of the vitellogenin levels. The results in the present study suggested that aromatase seems not the major target acted by TBT and BaP in fish. This study demonstrated that TBT or BaP exposure both inhibit the reproductive potential in female Sebastiscus marmoratus. Combined effect of TBT and BaP on the serum testosterone, estradiol and ALPP was not antagonism from the anticipation. 相似文献
30.
The peroxynitrite/porphyrin biomimetic system was established to investigate the effects of peroxynitrite on benzo[a]pyrene (B[a]P) metabolism. Three model systems consisting of different iron porphyrins were compared, and the results showed that the peroxynitrite/T(p-Cl)PPFeCl system was the highest catalytic efficiency in the metabolism of B[a]P. We analyzed the B[a]P metabolites produced from this system by RP-HPLC method and firstly identified the formation of nitrobenzo[a]pyrenes which are the special metabolites of B[a]P induced by peroxynitrite. 相似文献