TiO_2/beads as a photocatalyst for the degradation of X_(3B) azo dye

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An unusual tricentric X chromosome detected prenatally

We describe a female fetus with a de novo X chromosome rearrangement detected prenatally in both chorion villi and a pleural effusion. Chromosome painting showed the chromosome to be composed entirely of X chromosome material, while G-banding indicated a duplication of X short arms, four copies of the proximal long arm, and deletion of the distal long arm of the X. C-banding showed the presence of one active and two inactive centromeres and X-inactivation studies demonstrated the tricentric chromosome to be late replicating in all cells examined. The origin of this complex de novo rearrangement appears to have involved two separate breakage events, the first leading to the production of a dicentric X chromosome and the second generating the tricentric X.     

垃圾焚烧过程中NOx的生成特性研究

本文分别在固定床和自行设计的中空水冷转式垃圾焚烧炉中，研究了模化有机垃圾焚烧过程N02生成特性并将其实验结果作了对比，表明新型转式焚烧炉采用二次燃烧技术，有效降低了N02的生成。     

Inactivation effect of pressurized carbon dioxide on bacteriophage Qβ and ΦX174 as a novel disinfectant for water treatment

The inactivation effects of pressurized CO2 against bacteriophage Qβ and ΦX174 were investigated under the pressure of 0.3–0.9 MPa, initial concentration of 107–109PFU/mL, and temperature of17.8°C–27.2°C. The optimum conditions were found to be 0.7 MPa and an exposure time of 25 min. Under identical treatment conditions, a greater than 3.3-log reduction in bacteriophage Qβ was achieved by CO2, while a nearly 3.0 log reduction was observed for phage ΦX174. The viricidal effects of N2O(an inactivation gas with similar characteristics to CO2), normal acid(HCl), and CO2 treatment with phosphate buffered saline affirmed the chemical nature of CO2 treatment. The pumping cycle, depressurization rate, and release of intracellular substances caused by CO2 were its viricidal mechanisms. The results indicate that CO2 has the potential for use as a disinfectant without forming disinfection by-products.     

便携式X射线荧光光谱仪快速测定土壤中多种金属元素

采用粉末压片、X射线荧光光谱分析土壤中的多种金属元素,经标准样品验证,该方法的检出限、准确度、精密度均符合分析要求。与原子吸收光谱法做对比试验,结果表明Ni和Cr相对偏差较大,而Cu、Zn、Mn和Pb相对偏差均〈5％。实验表明x射线荧光光谱分析法样品制备简单、分析速度快,适用于应急监测。     

复合催化剂CuO-MnO_2-CeO_2/13X制备及其对萘的催化性能

采用浸渍法制备出复合过渡金属氧化物催化剂Cu O-Mn O2-Ce O2/13X,并用氮吸附、SEM、XRD、TGA对其结构、组成及热稳定性进行了表征,同时在固定催化床中研究了Cu O-Mn O2-Ce O2/13X催化剂对萘的催化性能。BET分析表明6%Cu O-Mn O2-2%Ce O2/13X催化剂的比表面积达到了476 m2/g,平均孔径达到2.314 nm,SEM和XRD结果表明一定负载率下Cu O、Mn O2、Ce O2在13X表面呈高度分散状态,有利于催化剂的催化活性提高。催化降解实验结果表明助催化剂Ce O2的适量添加可以明显提高催化剂的性能,当催化剂的负载率为6%Cu O-Mn O2-2%Ce O2时其对萘的催化率达到了65%。     

海三棱藨草及水莎草镉结合体初探

以海三棱藨草和水莎草为研究对象 ,人工环境下用镉诱导 ,探讨它们的镉结合体形成情况 ,结果显示海三棱草对镉较敏感。可进一步研究其镉结合体 ,作为监测重金属污染的生态毒理学指标。     

Loss of ozone on sulfate and sulfide doped-ice surfaces

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Prenatal identification of an isochromosome for the short arm of the Y i(Yp), by cytogenetic and Molecular analyses

A case of 45,X/46,X,+mar mosaicism was detected in a male fetus (27 weeks' gestation) referred for karyotype analysis following the observation of a short femur at the ultrasound scan. Analysis of 12 Y-chromosome loci by fluorescent in situ hybridization (FISH) and polymerase chain reaction (PCR) demonstrated that the marker chromosome is of Y origin and corresponds to an authentic isochromosome for the short arm of the Y chromosome, i(Yp). The breakpoint on this marker is in YQ11·1 close to the centromere. The present report illustrates the importance of FISH and PCR techniques as a complement to cytogenetic methods for accurate identification and characterization of chromosome rearrangements in prenatal diagnosis.     

Terminal deletion of Xp in a dysmorphic anencephalic fetus

We report an anencephalic fetus with acrania, cervicodorsal rachischisis, and a 46,X,del(X)(p22·1) karyotype. Necropsy revealed a left diaphragmatic hernia, ipsilateral lung hypoplasia, and intestinal malrotation. The fetus also had horseshoe kidneys and adrenal gland hypoplasia with absence of the fetal zone.