Antimutagenic potential of curcumin on chromosomal aberrations in Allium cepa

Turmeric has long been used as a spice and food colouring agent in Asia. In the present investigation, the antimutagenic potential of curcumin was evaluated in Allium cepa root meristem cells. So far there is no report on the biological properties of curcumin in plant test systems. The root tip cells were treated with sodium azide at 200 and 300 μg/ml for 3 h and curcumin was given at 5, 10 and 20 μg/ml for 16 h, prior to sodium azide treatment. The tips were squashed after colchicine treatment and the cells were analyzed for chromosome aberration and mitotic index. Curcumin induces chromosomal aberration in Allium cepa root tip cells in an insignificant manner, when compared with untreated control. Sodium azide alone induces chromosomal aberrations significantly with increasing concentrations. The total number of aberrations was significantly reduced in root tip cells pretreated with curcumin. The study reveals that curcumin has antimutagenic potential against sodium azide induced chromosomal aberrations in Allium cepa root meristem cells. In addition, it showed mild cytotoxicity by reducing the percentage of mitotic index in all curcumin treated groups, but the mechanism of action remains unknown. The antimutagenic potential of curcumin is effective at 5 μg/ml in Allium cepa root meristem cells.     

松嫩平原苏打盐碱地治理与利用

该文介绍了松嫩平原苏打盐碱地的分布及利用现状，对苏打盐碱地农业利用中存在的问题进行了分析。根据苏打盐碱化的成因、特性和近年来对其治理方面的最新攻关研究进展，实施分类治理，分别提出了一些可行有效的方法：即对低洼易涝盐碱地进行高产优势水稻钵大苗抗逆栽培技术为核心的栽培措施；对地势相对较高的碱化旱田采用微咸水淋洗改良措施等。实验表明：施用TC-1号苏打盐渍化土壤改良剂la后，耕层土壤溶液钠离子浓度降低26.2%-39.9%，土壤渗透性增强，团聚体增加120%-150%，水稻单产提高10.8%；压砂和施加有机肥则降低了根层土壤的pH值，且它们的施加量与pH的降低速率成正相关；盐碱地水稻钵育大苗抗逆栽培技术使秧苗各项素质指标比普通育苗提高30%左右，平均增产15%。碱化旱田微咸水淋洗改良则使0-35cm深度的亚粘土壤含盐量降低20%-40%，ESP降低26.7%，使高产高效作物的种植成为可能，提高了盐碱地的利用效率。     

氨苄西林钠氯唑西林钠含量测定方法研究

采用高效液相色谱法测定氨苄西林氯唑西林钠的含量。该方法在0.06mg/ml～0.6mg/ml范围内两主峰的峰面积与浓度呈良好的线性关系 分离度大于1.5 其回收率分别为99.3%、99.5% 取不同的供试品进行试验,结果表明该方法重现性好,操作简洁,快速,可同时检测双组分的含量,适合于该产品质量控制。     

氟硅酸钠氨化行为研究

研究了氟硅酸钠晶体在溶液中产生氨化的相关条件,研究表明:搅拌强度搅拌时间、溶液的酸度是影响氨化的主要因素。     

双氯芬酸钠缓释栓的稳定性研究

目的:研究不同条件下双氯芬酸钠缓释栓的稳定性.方法:按中国药典的规定进行影响因素实验、加速实验、长期贮存稳定性实验,考察其性状、含量、有关物质及融变时限的变化.结果:本品对光、热均不稳定.结论:本品贮存条件应为遮光、密闭,置阴凉处保存,有效期暂定1.5 a.     

喷雾干燥法生产氨苄西林钠的生产工艺研究

对原氨苄西林钠喷干法工艺改进,提高氨苄西林钠质量。通过改变成盐液底水的配比和氢氧化钠溶液的浓度,降低钠盐浓度的实验,提高氨苄西林钠无菌原粉质量。     

锡渣生产锡酸钠中除锑的研究

利用生产硫酸亚锡、氯化亚锡、锡粉的含锡废料生产锡酸钠,生产成本低,但在这过程中需要除去的杂质也相对比较多。文章对除锑的工艺参数和条件进行了研究,重点探讨了除锑温度、除锑时间、除锑后溶液静置沉降时间等因素对锑效果的影响。结果表明,采用该工艺,Sb的脱除率为95.3%,产品质量符合Sn-42等级标准。     

电解锡阳极泥中硫酸根脱除的方法

文章考察了电解锡阳极泥中硫酸根的脱除方法,在试验中选择洗涤的试剂碳酸钠,并对洗涤的终点进行了确定。     

甘氨酰二肽与乙酸钠相互作用的电导研究

测定了298.15 K条件下乙酸钠在三种甘氨酰二肽(甘氨酰甘氨酸,甘氨酰-L-缬氨酸和甘氨酰-L-亮氨酸)水溶液中的电导率,计算了乙酸钠在这些体系中的极限摩尔电导率和walden值.结果表明:电解质乙酸钠在甘氨酰二肽一水混合溶剂中的极限摩尔电导率随着混合溶剂中肽浓度的增加而减小,waIden值不为常数.