磷化

O-(1-Arylseleno-3-azido)isopropyl-O-2-(N3-tegafur)alkyl thiophosphate (3a～3f) were obtained via nu-cleophilic ring-opening of sodium azide to 2a～2f in dry DMF at room temperature, and their antitumor activities were tested.

以无水N，N-二甲基甲酰胺作溶剂，室温下，叠氮化钠中对2a～2f进行亲核开环，得到O-(1-芳硒基-3-叠氮基)异丙基-O-2-(N3-替加氟)乙基硫代磷酯。

The best application method is that 60% of silicon is used as based fertilizers, 40% of silicon as topdressing used in the eighth leaf.

现在硅肥已被国际土壤界列为继氮、磷、钾之后的第四大元素肥料，为全球农业及化肥业所重视[2]。

Adenosine was used as the raw material, dissolved in triethyl phosphate and then esterified with thiophosphoryl chloride under 0~5℃ for 8h without water and oxgen, in alkaline condition provided by 2,6-dimethylpyridine, introducing thiophosphoryl ester to adenosine.Then superfluous triethylamine was added and reacted under 5℃ for 1h to synthesize rough 5'-AMPS.The unpurified product was appled to a DEAE Sephadex A-25 column and eluted with triethylammonium bicarbonate.

用腺苷为起始原料，溶解于磷酸三乙脂中后，在无水无氧环境中及2，6-二甲基吡啶提供的碱性条件下与三氯硫磷以0~5℃下发生酯化反应8h，将硫代磷酸酯引入腺苷，然后再与过量三乙胺在5℃下反应1h，合成粗产品，再用碳酸氢三乙胺作洗脱液，过DEAE Sephadex A-25凝胶柱纯化。

Genistein promotes osteoid mineralization,reduces the loss of Ca, P and Mg in the bone and prevent the generation of osteoporosis in unsexed rats

染料木黄酮促进去势大鼠类骨质矿化，减少骨中钙、磷、镁丢失，预防骨质疏松的发生。

Study shows that,pH smallest coefficient of variation was 12.95%,coefficient of variation of soil available phosphorus was the largest,varia...

研究表明，pH的变异系数最小为12.95%，土壤有效磷的变异系数最大，变异值达到了122.18%；经克里金插值分析，研究区土壤养分的空间相关性减弱，朝均一化发展，这说明了红花套镇土地养分变化受人为因素影响较大，当地的土壤适合并已形成大面积的发展种养殖业，传统的稻、麦、棉种植数量和产量都与红花套镇的人平纯收负相关，对当地人平纯收贡献最大的是柑桔总产，相关系数分别为0.822，0.966，土地利用效率最大的是水产品养殖，相关系数分别为-0.760，0.870。

In this paper, the acetalization of benzylaldehyde and 1,3-propanediol in the presence of vanadium phosphorus oxide catalyst was studied.

研究了苯甲醛与1，3-丙二醇在钒磷氧催化剂作用下的缩醛化反应，考察了反应时间、醇醛比、催化剂用量、带水剂种类和用量等因素对苯甲醛1，3-丙二醇缩醛收率的影响。

KH12 could make its rhizosphere acider than XIN9005 so as to uptake more phosphorus.

KH12 的对根际土壤的酸化能力强于忻9005，增加了根系对磷素的吸收。

In this thesis, investigations focused on heteropoly acids-catalyzed C-C and C-N bond formation reactions and the synthesis of xanthenediones and acridinediones under thermal conditions are described.1.12-Phosphotungstic acid has been used as an efficient,eco-friendly,and air- and moisture-stable catalyst to promote the direct dehydrative substitution of the hydroxy group of benzylic and allylic alcohols with variousβ-dicarbonyl compounds.

本篇论文主要描述了杂多酸催化下的C-C和C-N键的生成，以及无溶剂直接加热下合成十氢氧杂蒽二酮和9-芳基十氢吖啶二酮。主要内容如下：1。在磷钨酸催化下，1，3-二羰基化合物与醇能够顺利偶合，脱除一分子的水，生成烷基化的1，3-二羰基化合物。反应在甲苯中进行时，二芳基甲醇能与各类1，3-二羰基化合物反应，成率很高；但对于1-苯乙醇，只能得到很低的产率。

A salt of bromic acid.To achieve such a miracle, the semiconductor industry has gone to extremes, using the world's most toxic substances like Arsine, Phosphine, Hydrofluoride, Hydrobromide and the like.Soon, even Synchroton will be used.

但是，为了这种&奇迹&，半导体技术也到了无所不用其极的地步，世上最剧毒的物质如砷烷(ah3)、磷烷(ph3)、氟化氢、溴化氢，等一长串毒品全都用上，很快连同步加速器也要用上去了。

The isopropyl chloracetate was synthesized by esterification of chloracetic acid with isopropyl alcohol using aluminium phosphotungstate as catalyst.

以氯乙酸和异丙醇为原料，磷钨酸铝作催化剂进行酯化反应，合成氯乙酸异丙酯。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。