珊瑚矿枱浮硫化矿分离选矿试验研究

珊瑚矿精选枱浮脱硫产出的硫化矿,含有铜、锌、硫、砷、钨、锡等有用矿物。经选矿分离试验,磨矿细度-0.074mm占83%的条件下,采用先铜后锌的优先浮选流程,可获得含铜23.85%、铜回收率90.02%的铜精矿和含锌45.02%,锌回收率85.18%的锌精矿。     

新疆某些药用植物的染色体观察

Chromosome examination was carried out in 30 medical plant species native to Xinjiang in 14 families,  ten of which are traditional medical plants of the minority na- tionalities in the region,  the karyotype analysis was also carried out in some species. Karyo- type formulae are 2n=12=10Lm+2SstSAT for Nigella glandulifera,  2n=16= 2m+12sm+ 2st for Trollius chinensis, 2n= 16 =8m + 8sm for Astragalus membranaceus, 2n=16=10m 6 sm  for Astragalus  mongholicus,  2n=16=8 m+8 sm for Catharanthus roseus.  The chromosomal numbers of the others are as follows: Dianthus chinensis,  2n=30, Vaccaria pyramidata,  2n=30, Cassia occidentalis,  2n=26, Psoralea corylifolia,  2n=22, Peganum har- mala,  2n=22, Acanthopanax trifolitus,  2n=46, Anethum graveolens,  2n=22, Foeniculum vulgare 2n=22, Trachyspermum ammi,  2n= 18, Agastache rugosus,  2n= 18 Dracocephalum moldavica,  2n= 10, Leonurus heterophyllus,  2n=20, Ocimum basilicum,  2n=48, schizone- peta tenuifolia,  2n=24, Atropa belladonna,  2n=60 Nicandra physaloidea,  2n=20, Solanum surattense,  2n=24, Scrophularia ningpoensis,  2n= 90, Plantago insularis,  2n =8, Gardenia jasminoides,  2n =22, Platycodon grandiflorus 2n= 18, Cichorium intybus,  2n= 18, Saussuea involucrata,  2n=32, Silybum marianum,  2n=34, Vernonia anthelmintica,  2n=20. The kar-yotypes of 8 species are reported for the first time.     

高效液相色谱法拆分酮咯酸氨丁三醇盐对映体

利用PM-β-环湖精手性固定相高效液相色谱法直接拆分酮咯酸氨丁三醇盐对映体．本试验研究了流动相中甲醇的含量、流动相的pH值、缓冲盐的浓度等色谱条件对拆分结果的影响．结果表明，在柱温为25℃，pH值为4．0，采用0．01mol／L的磷酸二氢钾缓冲溶液（含35％甲醇（V／V））作流动相时，酮咯酸盐对映体能达到基线分离．     

对应用型本科院校俱乐部制体育教学“教考分离”的思考

分析了应用型本科院校俱乐部制体育教学实施"教考分离"的利弊,提出了应用型本科院校俱乐部制下体育教学"教考分离"的实施条件和具体实施建议。     

Ar+注入小麦M3代变异的SSR鉴定及再分离研究

用Ar＋注入小麦花培5号的干种子。结果表明,M1代的生育期和农艺性状与对照差异不显著。M2代出现株高、穗长变异,变异率为0.2%,10个变异株经SSR鉴定,90对引物中有6对能扩增出特异带,突变点分别发生在2A、2D、3B、5A染色体上。10个变异株的M3代均发生严重的正向或负向分离,有利于筛选到特殊变异类型。     

用于乙醇-水分离的SA-PVA/PSF中空纤维渗透汽化复合膜

Using polysulfone (PSF) hollow fiber ultrafiltration membranes as the substrate, sodium alginate (SA) and polyvinyl alcohol (PVA) blend solutions as the coating solution, and maleic anhydride (MAC) as the cross-linked agent, SAPVA/PSF hollow fiber composite membranes were prepared for the dehydration of ethanol-water. The effects of different sodium alginate concentration in the coating solutions and different operating temperatures on pervaporation performance were investigated. The experimental results showed that pervaporation performance of the SA-PVA/PSF composite membranes for ethanol-water solution exhibited a high separation factor although they had a relatively low permeation flux. As SA concentration in SA-PVA coating solution was 66.7% and the operating temperature was 40 ℃, SA-PVA/PSF hollow fiber composite membrane (PS4) had a separation factor of 886 and flux of 12.6 g/(m2·h). Besides, SA-PVA/PSF hollow fiber composite membranes (PS3 and PS4) were used for the investigation of the effect of ethanol concentration in the feed solution on pervaporation performance.     

消除托班幼儿分离焦虑的方法初探

2~3岁的孩子正处于一个特殊的年龄阶段,他们一般都未经历过集体生活,让他们离开朝夕相处的父母或亲人,到一个完全陌生的环境中生活,往往会产生分离焦虑。刚入园的幼儿正处于这种状况。那么,促使幼儿顺利渡过这个特殊时期,尽快适应幼儿园的环境,就成为托班教师的一项重要工作。笔者拟结合自己的经验就此问题谈几点粗浅看法。一、做好入园前的准备工作很重要。(一)做好幼儿入园前的家访工作,拉近师幼距离。对托班孩子入园前的家访应有别于其他年龄班的幼儿,托班的所有老师应同时进行家访,在家访中注意通过沟通、玩耍、送小礼品等途径与幼儿建…     

探究植物细胞质壁分离及自动复原的情况

有大液泡的植物细胞能在一定条件下发生质壁分离及复原现象。若植物细胞能够自动吸收外界溶液中的物质,已发生质壁分离的植物细胞就可以自动复原。反复使用不同浓度的硝酸钾溶液进行实验,并无法成功展示质壁分离复原现象。寻找能使自动复原现象明显的溶液才具有推广学生实验的教学意义。将洋葱外表皮细胞直接放在6.25%的甘油溶液中,观察质壁分离及自动复原情况,效果非常明显。     

常染色体显性遗传的常见类型

由于各种复杂因素的影响,常染色体显性遗传的杂合子有可能出现不同的表现型,本文阐述了常染色体显性遗传的几种类型。     

“低温诱导植物细胞染色体数目的变化”实验的探索

参照人教版“低温诱导植物细胞染色体数目的变化”实验步骤,设计常温对照组,以及改变低温诱导的时长等一系列实验。研究发现,低温诱导后,大蒜根尖有丝分裂前中后各时期细胞中的染色体数目虽然未能准确计数,但与常温对照组相比明显增多;低温诱导72 h后再恢复常温处理24 h,染色体数目增加的细胞分裂相较多,优于单一低温处理。