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11.
Mark J. Pettenati Margaret Berry Vandana Shashi J. Hartley Bowen Margaret Harper 《黑龙江环境通报》2001,21(6):435-440
The prenatal diagnosis of a complete trisomy of the long arm of chromosome 1 is reported. Major ultrasound findings included: nuchal thickening, bi-temporal narrowing, a single choroid plexus cyst, andmild ventriculomegaly. There was a mass in the chest and abdomen, pleural effusion, ascites and a hyperechoic bowel. Skin edema was present. The fetus died at 26 weeks' gestation. A literature review is presented of 17 de novo and two inherited cases with only trisomy 1q. Of note is the fact that 3/5 prenatally detected 1q trisomies have teratomas. A review of the literature reveals a dismal outcome fortrisomy 1q cases if the duplication involves bands 1q25→q32. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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Jennifer K. Schultz Richard L. Pyle Edward DeMartini Brian W. Bowen 《Marine Biology》2007,151(1):167-175
Color variation is used in taxonomic classification of reef fishes, but it may not reliably indicate evolutionary divergence.
In the central Pacific, there are three color morphs of the flame angelfish, Centropyge loriculus: a red morph that occurs primarily in the Hawaiian archipelago, the endemic Marquesan color morph with reduced black markings,
and an orange morph that occurs throughout the rest of Oceania. The red and orange morphs co-occur at Johnston Atoll (1,300 km
south of Hawai’i), but intermediate forms have not been reported. To determine whether the three color morphs represent distinct
evolutionary lineages, we compared 641 base pairs of mitochondrial cytochrome b. Forty-one closely related haplotypes were observed in 116 individuals. Analysis of molecular variance (AMOVA) indicated
no significant genetic structure among color morphs (ΦST = 0.011, P = 0.147). Likewise, there was no significant pairwise structure between sampling locations, separated by up to 5,700 km,
after a Bonferroni correction (ΦST = 0.000–0.080, P = 0.0130–0.999). Genetic studies in conjunction with larval distribution data indicate that Centropyge species are highly dispersive. While there is a strong geographic component to the distribution of color morphs in C. loriculus, we find no evidence for corresponding genetic partitioning. We do not rule out an adaptive role for color differentiation,
but our data do not support emerging species. 相似文献
13.
Yu Zhiang Ma Yuxia Zhang Yifan Cheng Bowen Feng Fengliu Ma Bingji Jiao Haoran Zhou Ji 《Environmental geochemistry and health》2021,43(10):4123-4138
Environmental Geochemistry and Health - Recently, particulate matter pollution has been worsening, which has been affecting the asthma visits in children. In this study, we assessed the short-term... 相似文献
14.
Junyu Zheng Bowen Shi Xin Yuan Chuanzeng Zheng Yufan Yu Zhijiong Huang 《环境科学学报(英文版)》2023,123(1):430-445
Because of the recent growth in ground-level ozone and increased emission of volatile organic compounds (VOCs), VOC emission control has become a major concern in China. In response, emission caps to control VOC have been stipulated in recent policies, but few of them were constrained by the co-control target of PM2.5 and ozone, and discussed the factor that influence the emission cap formulation. Herein, we proposed a framework for quantification of VOC emission caps constrained by targets for PM2.5 and ozone via a new response surface modeling (RSM) technique, achieving 50% computational cost savings of the quantification. In the Pearl River Delta (PRD) region, the VOC emission caps constrained by air quality targets varied greatly with the NOx emission reduction level. If control measures in the surrounding areas of the PRD region were not considered, there could be two feasible strategies for VOC emission caps to meet air quality targets (160 µg/m3 for the maximum 8-hr-average 90th-percentile (MDA8-90%) ozone and 25 µg/m3 for the annual average of PM2.5): a moderate VOC emission cap with <20% NOx emission reductions or a notable VOC emission cap with >60% NOx emission reductions. If the ozone concentration target were reduced to 155 µg/m3, deep NOx emission reductions is the only feasible ozone control measure in PRD. Optimization of seasonal VOC emission caps based on the Monte Carlo simulation could allow us to gain higher ozone benefits or greater VOC emission reductions. If VOC emissions were further reduced in autumn, MDA8-90% ozone could be lowered by 0.3-1.5 µg/m3, equaling the ozone benefits of 10% VOC emission reduction measures. The method for VOC emission cap quantification and optimization proposed in this study could provide scientific guidance for coordinated control of regional PM2.5 and O3 pollution in China. 相似文献
15.
Zhang Yifan Ma Yuxia Shen Jiahui Li Heping Wang Hang Cheng Bowen Ma Liya 《Environmental science and pollution research international》2022,29(45):67776-67786
Environmental Science and Pollution Research - In recent years, O3 pollution had been worsening in China and became a major challenge for human health. To evaluate the O3 effects on circulatory and... 相似文献
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自2008年5月至2009年8月(共480 d),对遭受2008年特大冰雪灾害的广东省北部天井山国家森林公园中受灾点(海拔700 m)和未受灾点(海拔550 m)的3种植物:樟树(Cinnamomum camphora)、荷木(Schima superba)和罗浮栲(CastanopsisFagaceae)进行对比实验。选择生理指标为:光系统II最大光化学量子效率(Fv/Fm)、比叶面积(SLA)、叶干物质重(LDMC)、单位叶面积氮含量(Na)、单位叶面积多酚含量(Phena)。研究结果显示:3受灾种Fv/Fm均无下降;受灾罗浮栲、荷木的其他各指标在300 d后已恢复至正常水平,而受灾樟树的各生理指标在300 d后仍显著低于正常(p〈0.1);受灾樟树的生长模式由快速生长型改变为积累营养型。研究表明:(1)雪灾损伤对光系统II没有累积效果;(2)雪灾造成的冠层改变对中下林层的营养物质分配有影响;(3)作为人工栽培种的樟树,较自然生长种需要更长的灾后恢复期。 相似文献
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选取一定目数范围的活性焦,用3种酸(HCl、H2SO4和HNO3)、3种碱(KOH、NaOH和NH3·H2O)和酸碱两步(HNO3和KOH)对其进行改性处理,对比这几种方法改性的活性焦对烧结烟气的脱硫性能,实验结果表明,20~40目范围的活性焦脱硫性能最好;HCl改性活性焦的脱硫性能基本无变化,HNO3改性后有促进作用但作用不大,H2SO4改性反而降低了活性焦的脱硫活性;KOH和NaOH溶液改性活性焦对其脱硫性能有很大的提升作用,其中KOH改性效果更好,NH3·H2O改性基本无影响;先KOH后HNO3两步改性的活性焦效果最佳,并且能维持一定时间100%的脱硫效率。 相似文献
20.
从生物洗涤塔内循环洗涤液中分离鉴定得到3株苯降解菌Kocuria rosea sp. R(玫瑰色考克氏菌属)、Bacillus sp. W(芽孢杆菌属),以及Arthrobacter sp. Y(节杆菌属),通过研究其苯降解动力学,确定苯降解优势菌为Bacillus sp. W,优化其降解条件并探究其代谢途径。结果表明,添加皂角苷可促进苯的生物降解,但根据不同细菌的代谢特点,其影响存在显著差异。在产漆酶菌Bacillus sp. W的降解下,苯的半衰期为8.08 h,而皂角苷与苯共代谢时,苯的半衰期缩短为4.90 h。在最优条件下,即pH为7、起始苯浓度为50 mg·L−1、皂角苷添加量为75 mg·L−1,Bacillus sp. W的漆酶酶活最高为490.21 U·L−1。在漆酶等参与下苯存在独特苯降解通路,苯在加氧酶作用下转化为邻苯二酚,漆酶可催化酚羟基邻位发生甲氧基取代,进而分子内加成为呋喃衍生物,再经一系列下游酶的作用降解成小分子。在生物反应器中添加由分离得到3株菌株复合而成的菌剂,苯去除效率在第5 d达最高81.21%,比常规驯化活性污泥提前了17 d,还增强了反应器的抗冲击能力。将菌剂接种到实验室的泡沫生物洗涤反应器中,实现了反应器快速启动,启动期仅为5 d。本研究可为生物技术治理疏水性和难降解性VOCs提供参考。 相似文献