Live-weight gain, apparent digestibility, and economic benefits of yaks fed different diets during winter on the Tibetan plateau

Our goal was to determine the effect of diets with different crude protein (CP) contents and metabolizable energy (W) levels on daily live-weight gain, apparent digestibility, and economic benefit of feedlot yaks on the Tibetan plateau during winter. Yaks were either 2- or 3-years old and randomly selected from the same herd. The 3-year-olds were placed into one of two experimental groups (A and B) and a control (CK1), and the two-year-olds were placed into one of three experimental groups (C, D and E) and a control (CK2) (N per group = 5). Yak in the control groups were allow graze freely, while those in the experimental groups yaks were fed diets higher in contains crude protein and metabolizable energy through a winter period inside a warming shed. Results indicated that live-weight gain of treatment groups was higher than their respective controls during experiment, and that daily live-weight gain of every 10 days among different treatments was significant difference (P < 0.05). In addition, apparent digestibility of different diets was linearly and positively related to feedlotting time, and feed conversion efficiency for A, C, D and E groups was quadratically related to feedlotting time (P < 0.01), however, feed conversion efficiency for B group was linearly and positively related to feedlotting time (P < 0.05). The economic benefit was 1.15 for A, 1.89 for B, 1.16 for C, 1.54 for D, and 4,52 for E. (c) 2005 Elsevier B.V. All rights reserved.

聚硅氧化铝铁混凝剂（PSAFC）的制备及应用研究

利用工业废弃物硫铁矿烧渣，结晶氯化铝，工业用水玻璃，工业盐酸为原材料配制聚硅氯化铝铁FSAFC，并将其用于印染废水的处理，取得了良好的净水效果，结果表明：处理印染废水的最佳pH值为8－9，碱化度B为1，印染废水的CODCr去除率达到90％以上。

广西银屏富硼花岗岩岩浆-热液演化地球化学研究

已有的研究表明，与富B花岗岩有关的岩浆-热液体系以富含电气石矿物为特征，B和其它挥发分一起参与了岩浆分异、流体演化、围岩蚀变以及金属迁移和沉积的一系列过程。但至今B与Sn-W矿床之间是否存在协同性仍是个不解之迷。 电气石是B的主要寄主矿物，并且电气石被认为是成岩成矿的良好指示剂。目前，国内外对富B岩浆体系性状以及B对成岩成矿的作用研究相对比较缺乏。广西银屏细粒花岗岩是花山复式岩体最晚期的侵入岩相，不仅花岗岩中结晶有大量的电气石，而且在发育的晶洞中含有大量的电气石矿物。本文通过对银屏细粒花岗岩和晶洞中电气石化学组成、石英中流体包裹体的系统研究，探讨富B花岗岩形成和岩浆-热液体系演化地球化学特征，并对B与Sn矿化是否存在耦合关系的潜在性进行评价。 通过对富B花岗岩的研究，我们得到以下几点重要结论： (1) 银屏细粒花岗岩以高硅、高钾、富碱、低磷、准铝质为特征，具有较高的FeO*/MgO，富集大离子亲石元素、高场强元素和稀土元素。银屏细粒花岗岩的全岩样品显示强烈的稀土“四重效应”及等价不相容元素对 (Nb-Ta、Zr-Hf、Sr-Eu)分异，表明花山花岗岩分异演化晚期阶段存在熔体-流体作用； (2) 细粒花岗岩和晶洞中电气石为富Fe的黑电气石，前者是岩浆成因的，后者是蒸汽相成因的。两种成因电气石化学组成非常一致，几乎不含有过剩Al，Fe/(Fe+Mg)比值集中分布于0.96～0.98之间。Al3+=Fe3+和R++R2+=R3++□是电气石中2个主要置换反应； (3) 花山A型花岗岩形成演化过程中不存在狭义的岩浆-热液过渡阶段，形成细粒花岗岩的岩浆具有极高的粘度，大量的饱和蒸汽相被高粘度的熔体捕获﹑圈闭，气泡生长是岩浆去气的主要方式；尽管岩浆在相对高的氧逸度条件下分异演化，但由于缺乏岩浆-热液演化过程，在银屏岩体范围内不太可能发生有规模的锡石-石英脉型矿化作用； (4) 晶洞石英显示仅含有气液包裹体，而无其他类型包裹体共存，表明岩浆流体演化晚期为均匀的单一相。晚期流体的温压范围在150～265 °C，41～72 MPa之间。

A velocity map ion-imaging study on ketene photodissociation at 208 and 213 nm: Rotational dependence of product angular anisotropy

Photodissociation dynamics of ketene following excitation at 208.59 and 213.24 nm have been investigated using the velocity map ion-imaging method. Both the angular distribution and translational energy distribution of the CO products at different rotational and vibrational states have been obtained. No significant difference in the translational energy distributions for different CO rotational state products has been observed at both excitation wavelengths. The anisotropy parameter beta is, however, noticeably different for different CO rotational state products at both excitation wavelengths. For lower rotational states of the CO product, beta is smaller than zero, while beta is larger than zero for CO at higher rotational states. The observed rotational dependence of angular anisotropy is interpreted as the dynamical influence of a peculiar conical intersection between the B-1(1) excited state and (1)A(2) state along the C-S-I coordinate.

Age-dependence of urinary normal and modified nucleosides in childhood as determined by reversed-phase high-performance liquid chromatography

Modified nucleosides have been characterized as tumor markers for a number of malignant diseases. In order to use these markers in children, the age-dependence of the nucleoside levels in healthy children has to be established and taken into account in diagnostic decisions. In this study, the levels of 12 normal and modified nucleosides in urine of 166 healthy children and adolescents with an age between 1 day and 19 years are determined by reversed-phase HPLC, and age-dependent reference ranges are defined. The urinary nucleoside concentrations are related to the creatinine concentrations, which allows the use of randomly collected urine samples. All nucleoside levels in urine of children decrease with age, most pronounced during the first 4 years of life, and the age-dependence of the reference values of the individual nucleosides can be approximated by a mathematical function y = b(0) + b(1) (1/x) with the regression coefficients b(0) and b(1), the nucleoside levels y and the age x between 1 year and 19 years. In the very young children, the shifts in the nucleoside concentrations are more differentiated. Starting with low levels on the first day of life, the concentrations of all studied nucleosides rise up to an age of 1-2 months, when they reach their absolute maximum for all age periods, and then decrease. (C) 2004 Elsevier B.V. All rights reserved.