潼峪金矿床矿化富集规律及深部成矿预测

通过对矿区构造及矿脉空问分布特征的研究．认为舍矿脉体总体受向斜构造的控制。在深入认识矿化富集规律,参照以往深部工程资料。结合物探测深及化探工作成果,提出矿区中浅部有3层矿且平行分布。并沿走向按一定间距形成矿化浓集区;矿区深部亦有3层矿近平行排列。并沿走向和倾斜方向形成矿化浓集区。对中浅部矿与深部矿作了定性定位定量预测。     

Microtubule‐Templated Biomimetic Mineralization of Lepidocrocite

Protein microtubules (MTs) 25 nm in diameter and tens of micrometers long have been used as templates for the biomimetic mineralization of FeOOH. Exposure of MTs to anaerobic aqueous solutions of Fe²⁺ buffered to neutral pH followed by aerial oxidation leads to the formation of iron oxide coated MTs. The iron oxide layer was found to grow via a two‐step process: initially formed 10–30 nm thick coatings were found to be amorphous in structure and comprised of several iron‐containing species. Further growth resulted in MTs coated with highly crystalline layers of lepidocrocite with a controllable thickness of up to 125 nm. On the micrometer size scale, these coated MTs were observed to form large, irregular bundles containing hundreds of individually coated MTs. Iron oxide grew selectively on the MT surface, a result of the highly charged MT surface that provided an interface favorable for iron oxide nucleation. This result illustrates that MTs can be used as scaffolds for the in‐situ production of high‐aspect‐ratio inorganic nanowires.     

连续淹水培养条件下沉积物和土壤的氮素矿化过程

在淹水条件下,采用连续培养法研究了后海沉积物(HH)、环科院沉积物(HK)和土壤(TR)的氮素矿化过程。结果表明:三个处理矿化趋势基本相同,都是培养前期矿化量迅速升高并达到峰值,之后逐渐降低,最后回到培养前的氨氮含量水平。两种沉积物的矿化高峰出现时间在培养的第4天,要早于TR的第7天;污染严重HH的矿化最大累积量远大于污染较轻的HK和TR。培养过程中各处理各层次有机质、总氮和固定态铵含量都表现为降低趋势。说明培养过程中,开始占主导地位的氨化微生物被其它土壤微生物所代替,这些微生物大量繁殖,生物固持作用逐渐强于矿化作用,造成矿化氮和固定态铵含量迅速下降。     

Tracing process of β-TCP ceramics in vivo with ^45Ca

The metabolic way of calcium ions which was released due to in vivo degradation of porous β-TCP ceramics was studied by using the radioisotope ^45Ca as tracer. The result shows that some of the calcium ions enter blood and take part in the circulation. These calcium ions distribute into organs and tissues (such as liver, kidney, brain,heart, lung, spleen and stomach) and participate in the metabolisms of body. There is neither the accumulation of calcium ions, nor the lesion or pathologic calcification of the organs and tissues. Some of the calcium ions that enter the near-end femur, ulna and skull are reused by bony tissue to take part in both local mineralization processes during bone healing, or are stored in calcium pool which can participate in the whole body circulating. In the cyclical process, other calcium ions are excreted with urine and feces through kidney and liver. It is indicated that the degradation products of β-TCP ceramics can take part in the physiological metabolic process of normal bone and tissue.     

苏丹中部半干旱地区含水层特征的评价

苏丹中部的北杰济拉(Gezira)省的含水层为杰济拉含水层和白垩系含水层.在确定含水层水文地质参数的基础上,绘制了地下水水位等值线图,并通过矿化度的空间分布对地下水的化学特性进行评价.对水文地质参数的计算采用了雅各布方法和泰斯恢复水位法,通过对地下水中主要化学成分的分析来评价地下水水质,并绘制有关的水化学特性图.测得杰济拉含水层的平均导水系数和渗透系数分别为368 7m2/d和34 03m/d,均小于白垩系含水层的407 2m2/d和43 17m/d.杰济拉含水层物理化学成分的浓度明显高于白垩系含水层.白垩系含水层水质较好,适宜用作生活用水及饮用水.     

Biomimetic Mineralization and Degradation of Bioelectret Film in vitro

1Introduction Anelectrethasthepropertyofchargestorage,and theelectreteffectofbiologicaltissuesisanormalphe nomenon.Manykindsoftissuesandcomponentsinthe body,suchasbloodvessels,bone,tendon,collagen,polysaccharides,enzymes,DNAandRNAshowtheelec treteffect[1]…     

The Role of KV7.3 in Regulating Osteoblast Maturation and Mineralization

KCNQ (K_V7) channels are voltage-gated potassium (K_V) channels, and the function of K_V7 channels in muscles, neurons, and sensory cells is well established. We confirmed that overall blockade of K_V channels with tetraethylammonium augmented the mineralization of bone-marrow-derived human mesenchymal stem cells during osteogenic differentiation, and we determined that K_V7.3 was expressed in MG-63 and Saos-2 cells at the mRNA and protein levels. In addition, functional K_V7 currents were detected in MG-63 cells. Inhibition of K_V7.3 by linopirdine or XE991 increased the matrix mineralization during osteoblast differentiation. This was confirmed by alkaline phosphatase, osteocalcin, and osterix in MG-63 cells, whereas the expression of Runx2 showed no significant change. The extracellular glutamate secreted by osteoblasts was also measured to investigate its effect on MG-63 osteoblast differentiation. Blockade of K_V7.3 promoted the release of glutamate via the phosphorylation of extracellular signal-regulated kinase 1/2-mediated upregulation of synapsin, and induced the deposition of type 1 collagen. However, activation of K_V7.3 by flupirtine did not produce notable changes in matrix mineralization during osteoblast differentiation. These results suggest that K_V7.3 could be a novel regulator in osteoblast differentiation.     

咸宁温泉地下热水的水化学特征

咸宁温泉属中—低温型地热田,按其热水分布和热显示特征可分为溢出型水热区和掩埋型水热区,前者以对流传热为主,后者以传导传热为主。热水的水化学类型为硫酸钙型,属中性极硬微咸水。常规离子的检出浓度普遍比地下冷水和地表水高。热水中不仅总矿化度高,而且SiO_2、F、S~(2-)的检出浓度也不同,其变化往往与围岩介质、气体掺入和温度等密切相关,水温越高,其溶滤、溶解、浓缩和离子吸附作用等越强,化学反应越快,因而它们的化学成份及其含量必然就不同了。区内岩石中镭(Ra)的含量极其微弱,且其分布与岩石的硅化程度无关,而与区内主要构造线方向吻合,并受断裂构造的制约而呈长条状分布,与断裂的性质和规模有关。氧射气的显示与地下热水的循环条件、迳流速度有关,而且随深度的增加,温度的升高静水压力的相应增大,氡射气溶解度也相应的增加,其含量也逐渐增高。     

哈达门沟金矿13号脉的可视化成矿地质条件分析及深部预测

内蒙古哈达门沟金矿是内蒙古境内最大的黄金矿山之一。基于三维模型理论和方法,使用Surpac软件对其中的13号矿脉进行三维模型的建立,分析其矿体的主要成矿因素,包括地表、矿体、构造、岩体、蚀变等三维模型,了解矿体、岩体形态,构造特征,分析矿体与周边岩体、蚀变带及构造之间的相互关系,发现哈达门沟金矿主要受到构造控制,花岗伟晶岩脉充填早期破碎带带动了金元素的向上迁移,蚀变形成的硅质含金硫化物最终得到沉淀,形成矿体。通过建立哈达门沟13号脉金品位块体模型了解其金元素的分布情况,推测标高500m以下可能存在矿化潜力区。     

伊犁盆地乌库尔其铀矿床西山窑组上段砂体发育特征与铀成矿分析

砂体发育特征决定了铀矿体的分布,通过对乌库尔其铀矿床中侏罗统西山窑组上段Ⅶ1及Ⅶ2两个亚旋回砂体厚度特征的分析,得出了砂体构形变化的部位是成矿的有利部位,即砂体厚度由厚变薄的过渡地段,有利于铀矿的富集。此外,铀矿体主要赋存于孔隙度较高、渗透性较好的长石岩屑类粗砂岩、含砾粗砂岩和中砂岩中,成矿最好的粒度为粗砂岩。