961 resultados para 804


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以差示扫描量热法对热致液晶聚酯酰亚胺的结晶过程和液晶化过程的非等温相转变动力学行为进行了初步研究,根据Jeziorny方法处理数据得到了表征聚合物非等温相转变动力学参数Z_C、G_C,并对其进行了讨论。结果表明:在所研究的条件下聚合物的相转变过程基本上符合Jeziorny结论,但两种相转变的成核与生长方式是不同的。

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The mass spectral behaviour of 15 new type of organic phosphorus compounds with a considerable insecticidal activity, 1, 3,2-oxazaphospholidine 2-sulfides derivatives, under 70 eV electron impact has been studied by means of high and low resolution mass spectrometry as well as by B/E linked scan and MIKES/CID analysis. Discussion is focused into the isomerization between oxygen and sulphur in molecules and some rearrangement reactions.

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本文报道15种新合成的2-硫-1,3,2-氧氮磷杂环戊烷衍生物的 EI 谱.在质量分析离子动能谱、碰撞诱导分解谱、B/E 联动扫描及高分辨精确质量测量的基础上,讨论了这类化合物的质谱裂解机理及特征.着重讨论上述化合物的氧硫异构现象及几种重排反应.

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合成了钐与磷酸二甲酯的配合物,该配合物的组成为Sm〔(CH_3O)_2PO_2〕_3,测定了该配合物的红外和拉曼光谱。x射线单晶衍射法测定配合物的晶体属单斜晶系,P2_(1/c)空间群,α=10.434(4)A,b=16.541(3)A,c=10.804(4)A,β=111.75(3)°,V=1731.7(9)A~3,Z=4。钐与6个氧原子配位,每2个相邻的钐原子通过双“O—P—O”桥相连接,形成奇特的“双桥24元环”的环套环网状结构。钐氧配位多面体为稍微扭曲的正八面体。

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本文以南黄海1997~2006年10年表层海水和沉积物中重金属为主要研究对象,同时结合对生态环境信息的综合分析,系统探讨了海水和沉积物中重金属的生物地球化学特征、影响控制因素、演变趋势,并对海域生态风险进行了评估,获得了以下一系列新的结果和认识: 1.系统获得了南黄海海水和沉积物中重金属的地球化学分布模式,揭示了影响和控制其生物地球化学特征的因素 南黄海表层海水中重金属As、Cd、Cu、Hg、Pb、Zn的平均浓度分别为2.33、0.078、1.41、0.0036、0.37、6.21 μg/L,低于其它中国近海海水,而高于水交换较好的深海;表层海水重金属的分布模式(除Pb外)表现为在离岸较远的南黄海中部地区其含量较低,而近岸海区则普遍含量较高,区域分布呈现“高Cd-Cu-Hg-Zn区”,“高Pb-Cu-Zn区”以及“高Pb区”三个地球化学分区。 南黄海表层沉积物中重金属比邻近海域沉积物中的浓度低,南黄海重金属主要受沉积物粒度控制,即在细粒度高的南黄海中部区域重金属(除As外)的含量较高,粗粒度的近岸区则较低,区域分布呈现“高Cd-Cu-Pb-Zn区”,“高Hg低As-Cu-Zn区”以及“高As低Cd-Hg-Zn区”三个地球化学分区。 人类活动已经显著影响了南黄海海水中重金属的含量水平,重金属分布是径流、大气沉降、pH、盐度和重金属自身性质等各种影响因子耦合的结果。沉积物重金属的富集因子Pb>As>Hg>Cd>Zn>Cr>Cu,其中Pb和As主要来自人为污染排放,污染状况相对较重,Cr和Cu几乎没有受到人为污染的影响。沉积物的粒度是控制表层沉积物重金属分布的最主要因素,次要的因素包括沉积物有机质的含量、沉积速率以及重金属存在形态等。 2.首次获得了南黄海海水和沉积物中重金属的演变趋势 近10年来南黄海表层海水中,Zn呈上升趋势,As、Cd、Cu、Pb基本稳定变化不大,而Hg则呈略下降趋势。Zn的线性上升趋势明显,在近岸水域和中央水域中其浓度和公元年的统计关系分别为y=0.9524x+0.0034(R=0.97)和y=0.8622x+0.0299(R=0.95)(其中y为Zn的浓度,x为年度,取1997~2004)。近10年沉积物中重金属年际变化较小,浓度变化在多年均值的±(10%~30%)之间变动。As、Cd、Cu、Hg、Pb、Zn的均值变化范围分别为7.17±1.70、0.108±0.024、17.61±1.65、0.024±0.008、18.44±4.26、70.53±5.73 mg/kg,除了Hg随公元年呈较好的线性增加(y=0.0033x-6.50,R=0.75)外,其它重金属未显现出有明显的演变趋势。 近百年来,南黄海重金属的变化可分为3个阶段,20世纪60年代以前,20世纪60年代至90年代,及20世纪90年代至今。第一个阶段的60年可以看作是南黄海未明显受人类活动影响的一个时期,该段时期内明显的特征是重金属含量的变化受径流输入不均等多种因素影响,变化规律性不强;第二阶段是南黄海近岸工农业迅猛发展的阶段,由近岸传输到这一海域的重金属量增加,南黄海沉积物重金属浓度增加,沉积物质量有下降的趋势,这一阶段是人类活动影响南黄海最为明显的一个阶段;第三个阶段是20世纪90年代至今,南黄海沉积物重金属浓度呈降低趋势,与中韩两国减排及治污措施有关。近几年,南黄海沉积物的环境质量较20世纪末期有了较明显的改善。 3. 初步阐明了南黄海重金属的环境污染危害和潜在生态风险 采用潜在生态危害指数法和地积累指数等方法对南黄海沉积环境进行分析,结果表明,中等重金属污染程度海区占研究海区面积的38.7%,中等生态风险的区域则占了研究海区面积77.8%,但均未发现沉积物中的重金属与生物量的分布有明显的关系,总体表明,南黄海沉积物中的重金的污染状况及生态风险较低,南黄海沉积物质量良好。

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述评了放牧干扰对高寒草场动植物群落、土壤养分、土壤微生物活动及草场退化等的影响,指出了合理利用高寒草场的优化放牧策略,只有确定适宜的放牧强度,科学施加放牧干扰,才能保证高寒草场生态系统的健康发展,促进草地畜牧业的可持续性。

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闽东南的海边斜闪煌斑岩脉和赤湖辉长岩脉分别形成于晚白垩世和古新世,为高钾钙碱性和钙碱性系列岩石,具有高Al、Na2O>K2O的特征;岩浆演化过程中可能经历了以橄榄石、单斜辉石为主的结晶分异作用.海边和赤湖基性岩脉具有相对富集大离子亲石元素和轻稀土元素,亏损高强场元素特征,不相容元素蛛网图显示出大陆边缘弧的地球化学特征,以Nb、Ta、Ti负异常为特征;海边和赤湖明显富集轻稀土元素,(La/Yb)N分别为5.0~10.9和11.2~12.0.具有高Sr同位素初始值和低εNd(t)值,海边的(^87Sr/^86Sr)i:0.70577~0.707574,εNd(t):-8.1~-1.8,赤湖的(^87Sr/^86Sr)i:0.70547~0.70552,εNd(t):-0.2~0.6.根据Sr、Nd同位素、微量元素研究及野外地质观察,本区基性岩脉的岩浆在上升侵位过程中未发生地壳物质混染.通过Sr、Nd同位素和微量元素等研究,认为地幔源区的演化与古太平洋板块俯冲密切相关,俯冲流体交代地幔楔、消减洋壳携带的海洋与陆源沉积物参与地幔源区的混合,形成本区基性岩脉的富集地幔源区,大离子亲石元素和轻稀土元素特别富集是俯冲流体与沉积物共同参与源区演化的结果.海边和赤湖基性岩脉形成的构造背景属于活动大陆边缘弧,构造性质应为活动陆缘拉张带(或裂谷带).晚白垩世和古新世,闽东南发生了地壳拉张事件,与中国东南部晚白垩世以来的地壳拉张期次是一致.

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本研究选择有代表性的陕西省潼关县(小秦岭地区)采金地区作为研究对象,从环境地球化学的角度出发,研究了该地区由于受采金活动的影响后,大气、水体、土壤以及农作物中总汞和甲基汞的分布,探讨汞在采金地区环境中迁移、转化和富集的环境地球化学行为和规律,并估算了渲关县及全国在过去二十多年里,由混汞法炼金活动向环境释放汞的总量,最后对混汞法采金地区的环境管理提出可行性建一议。通过本论文的详细研究,主要得出以下结论:1.潼关县辖区大气汞的分布呈明显的空间梯度关系,炼金厂密集区大气汞含量明显高于其它地区,距离炼金厂越远,大气汞含量越低。大型炼金厂混汞提金车间内的平均大气汞浓度为18,047ng/m~3,最高达33,080ng/m~3;距离炼金厂密集区较近和较远的居民区的平均大气汞浓度分别为385ng/m~3和77ng/m~3;而一些偏远地区大气汞的平均浓度降至29ng/m~3,受炼金活动影响较 小的黄河沿岸背景区的平均大气汞浓度只有2ng/m~3。通过估算,潼关县炼金矿工汞蒸气的平均摄入量高达72,804~75,268ng/d,而当地非矿工居民(成人)每天的摄入量也有924~4,620ng。2.潼关县内泉水和井水中总汞的平均浓度有329.2ng/L,其中各形态汞的浓度都相对较高,说明金矿地区的汞背景值可能较高,且地下水也可能受到一定程度的汞污染;冷暖两季水样中溶解态汞浓度和暖季的甲基汞浓度要比泉水和井水中的溶解态汞和甲基汞浓度分别高出几倍,其它形态汞则要高出几百倍;水样中的活性汞和溶解态汞浓度表现出极显著的相关关系;冷季水样的活性汞和溶解态汞平均浓度要略高于暖季的水样,而颗粒态汞恰恰相反;两季采集的一些水样中活性汞在溶解态汞中占有较高的比例,但总汞均以颗粒态为主,大多超过50%。3.冷暖两季沉积物中平均总汞浓度分别高达151.1和44.6μg/g,甲基汞平均浓度分别为7.1和3.6ng/g,而暖季沉积物中总汞与甲基汞含量表现出极显著的相关关系;水体颗粒物和沉积物主要来源于炼金厂排出的废渣和尾矿,拥有较高的重金属(Hg、Fe、Mn和Cu)含量,且两者之间体现出一定的继承关系,但颗粒物由于粒径小,表面积大,含有机颗粒多,吸附能力强,所以其中的重金属含量要明显高于沉积物中的重金属含量;颗粒物中汞含量与Fe、Mn、Cu的含量之间均表现出极显著的相关性,而沉积物中汞含量仅与Cu含量之间有一定的相关性,与其它重金属含量的相关性不明显。4.潼关县辖区金矿石中汞的平均含量是69.2ng/g,而炼金尾矿中汞的平均含量竟高达628,4林吮,高出原矿石样中汞平均含量10,000倍,其它重金属(Fe、Mn、Cu)由于受炼金活动影响较小,其含量变化并不十分明显;黄土由于自身的特殊质地和性质,受炼金活动的干扰较小,其中的各重金属含量能够较好的反映其背景含量水平;撞关地区采集的土壤样品中总汞和甲基汞含量均要比黄土中的含量高约50倍,而其它重金属含量与黄土背景值无明显差异;土壤中甲基汞在总汞含量中所占比例较小(分布在0.001%~0.57%之间),说明潼关地区土壤中汞的甲基化水平较低。5.苔鲜样品中的高汞含量反映了采金地区较高的大气汞沉降水平;河流水藻中高含量的总汞和甲基汞体现出汞在生物体内超强的富集作用;潼关县大多数农作物样品中的汞主要来源于大气,且几乎所有样品的汞含量都严重超出国家食用标准,最高超标倍数达到60;农作物中甲基汞含量占总汞的比例在0.12%~12.34%之间波动,其中蔬菜类作物的甲基汞比例要高于粮食作物,而总体来说,作物体内的总汞和甲基汞含量之间表现出一定的负相关关系;通过估算,潼关县居民由于粮食作物(小麦)的食用每天摄入的总汞量高达54,72Ong,要高于当地居民(非矿工)通过呼吸吸入的汞蒸气量,且已超出国际上对人体汞摄入量标准的有关规定。6.潼关县水体、沉积物、土壤以及农作物中的甲基汞含量相对总汞而言,都表现了相对较低的水平,原因可能是受石英脉型金矿地区地质背景的影响,大量存在的Fe、Mn类化合物对离子态汞有着较强的束缚能力,减缓或抑制了甲基化的发生。7.通过混汞法生产黄金的产量和汞释放因子的调研和确定,估算在1980~2003年期间,全国混汞炼金行业向环境释放汞累计达1476.6t,其中约有78%进入大气;而仅潼关县就有116.5t,约占全国的7.9%:目前(1996年以后),由于混汞法工艺的改进,汞的释放量大大降低,全国混汞炼金行业平均每年释放汞约30t,憧关县平均每年有3.9t,约占全国年平均释放量的13%。

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Edkins, J., Exposed singularity, Journal for Cultural Research, Volume 9, Issue 4 October 2005 , pages 359 - 386 RAE2008

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Rab4 is a member of the Rab superfamily of small GTPases. It is localized to the early sorting endosome and plays a role in regulating the transport from this compartment to the recycling and degradative pathways. In order to further our understanding of the role Rab4 plays in endocytosis, a yeast two-hybrid screen was performed to identify putative Rab4 effectors. A constitutively active mutant of Rab4, Rab4Q67L, when used as bait to screen a HeLa cDNA library, identified a novel 80kDa protein that interacted with Rab4-GTP. This protein was called Rab Coupling Protein (RCP). RCP interacts preferentially with the GTP-bound form of Rab4. Subsequent work demonstrated that RCP also interacts with Rab11, and that this interaction is not nucleotide-depenedent. RCP is predominantly membrane-bound and localised to the perinuclear recycling compartment. Expression of a truncation mutant of RCP, that contains the Rab binding domain, in HeLa cells, results in the formation of an extensive tubular network that can be labelled with transferrin. These tubules are derived from the recycling compartment since they are inaccessible to transferrin when the ligand is internalised at 18oC. The truncation mutant-induced morphology can be rescued by overexpression of active Rab11, but not active Rab4. This suggests that RCP functions between Rab4 and Rab11 in the receptor recycling pathway, and may act as a ‘molecular bridge’ between these two sequentially acting small GTPases. Quantitative assays demonstrated that overexpression of the truncation mutant results in a dramatic inhibition in the rate of receptor recycling. Database analysis revealed that RCP belongs to a family of Rab interacting proteins, each characterised by a carboxy-terminal coiled-coil domain and an amino-terminal phospholipid-binding domain. KIAA0941, an RCP homologue, interacts with Rab11, but not with Rab4. Overexpression of its Rab binding domain also results in a tubular network, however, this tubulation cannot be rescued by active Rab11.

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PREMISE OF THE STUDY: We investigated the origins of 252 Southern Appalachian woody species representing 158 clades to analyze larger patterns of biogeographic connectivity around the northern hemisphere. We tested biogeographic hypotheses regarding the timing of species disjunctions to eastern Asia and among areas of North America. METHODS: We delimited species into biogeographically informative clades, compiled sister-area data, and generated graphic representations of area connections across clades. We calculated taxon diversity within clades and plotted divergence times. KEY RESULTS: Of the total taxon diversity, 45% were distributed among 25 North American endemic clades. Sister taxa within eastern North America and eastern Asia were proportionally equal in frequency, accounting for over 50% of the sister-area connections. At increasing phylogenetic depth, connections to the Old World dominated. Divergence times for 65 clades with intercontinental disjunctions were continuous, whereas 11 intracontinental disjunctions to western North America and nine to eastern Mexico were temporally congruent. CONCLUSIONS: Over one third of the clades have likely undergone speciation within the region of eastern North America. The biogeographic pattern for the region is asymmetric, consisting of mostly mixed-aged, low-diversity clades connecting to the Old World, and a minority of New World clades. Divergence time data suggest that climate change in the Late Miocene to Early Pliocene generated disjunct patterns within North America. Continuous splitting times during the last 45 million years support the hypothesis that widespread distributions formed repeatedly during favorable periods, with serial cooling trends producing pseudocongruent area disjunctions between eastern North America and eastern Asia.

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Recent investigation has identified association of IL-12p40 blood levels with melanoma recurrence and patient survival. No studies have investigated associations of single-nucleotide polymorphisms (SNPs) with melanoma patient IL-12p40 blood levels or their potential contributions to melanoma susceptibility or patient outcome. In the current study, 818,237 SNPs were available for 1,804 melanoma cases and 1,026 controls. IL-12p40 blood levels were assessed among 573 cases (discovery), 249 cases (case validation), and 299 controls (control validation). SNPs were evaluated for association with log[IL-12p40] levels in the discovery data set and replicated in two validation data sets, and significant SNPs were assessed for association with melanoma susceptibility and patient outcomes. The most significant SNP associated with log[IL-12p40] was in the IL-12B gene region (rs6897260, combined P=9.26 × 10(-38)); this single variant explained 13.1% of variability in log[IL-12p40]. The most significant SNP in EBF1 was rs6895454 (combined P=2.24 × 10(-9)). A marker in IL12B was associated with melanoma susceptibility (rs3213119, multivariate P=0.0499; OR=1.50, 95% CI 1.00-2.24), whereas a marker in EBF1 was associated with melanoma-specific survival in advanced-stage patients (rs10515789, multivariate P=0.02; HR=1.93, 95% CI 1.11-3.35). Both EBF1 and IL12B strongly regulate IL-12p40 blood levels, and IL-12p40 polymorphisms may contribute to melanoma susceptibility and influence patient outcome.