常见蔬菜的十个错误吃法

了解蔬菜的错误吃法,让你用正确的方法摄取多样营养! 1经常存餐前吃两红柿 西红柿应该在餐后再吃.这样,可使胃酸和食物混合,大大降低酸度,避免胃内压力升高引起胃扩张,使宝宝产生腹痛、胃部不适等症状.     

低磷胁迫对水稻地上部钙、镁吸收和积累的影响

采用瓮栽试验系统研究了低磷(P)胁迫条件下不同P效率水稻基因型在分蘖期、孕穗期和成熟期的钙(Ca)、镁(Mg)营养特性.结果表明,低P胁迫对不同基因型水稻Ca、Mg吸收的影响因生育期、基因型和部位不同而不同.分蘖期时,低P胁迫使水稻体内Ca含量增加,低P敏感基因型水稻地上部Mg含量增加,耐低P基因型则Mg含量降低.孕穗期时,低P胁迫使不同基因型水稻体内Ca、Mg含量下降.至成熟期,除99056外,其它基因型籽粒内Ca、Mg含量均降低;除99012外,其它基因型茎叶中Ca、Mg含量也降低.各个时期低P胁迫都降低了Ca、Mg在水稻地上部分的积累量,耐低P基因型只在孕穗期表现出相对的优势.低P胁迫同时降低了成熟期茎叶内Ca、Mg向籽粒的转移,但99056却例外.低P胁迫下,较之低P敏感基因型,耐低P基因型水稻对Ca、Mg的吸收和积累并没有表现出明显的优势.图4表7参26     

Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids

Low-molecular-weight(LMW) organic acids widely exist in soils, particularly in the rhizosphere. A series of batch experiments were carded out to investigate the phosphorus release from rock phosphate and iron phosphate by low-molecular-weight organic acids.Results showed that citdc acid had the highest capacity to solubilize P from both rock and iron phosphate. P solubUization from rock phosphate and iron phosphate resulted in net proton consumption. P release from rock phosphate was positively correlated with the pκa values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with pκa. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearly. Addition of phenolic compounds further increased the P release from iron phosphate. Initial solution pH had much more substantial effect on P release from rock phosphate than from iron phosphate.     

二次微絮凝与常规絮凝的对比试验

以石家庄某水库低温低浊水为研究对象,采用有机物表观相对分子质量分级和有机物化学极性分级技术从分子水平的变化对原水溶解性有机物进行分析,并测定了其各组分质量分数与三卤甲烷生成势的相关性,获得了原水中溶解性有机物DOM去除率较低的原因,同时进行了二次微絮凝和常规絮凝的混凝试验,考察了水体浊度、Zeta电位、抽滤时间、颗粒数和有机物等各指标的变化情况。结果表明,二次微絮凝比常规絮凝有更强的混凝去除效果,当聚合氯化铝PAC总投加量为13 mg/L、絮凝时间为3 min时,滤后水浊度可达到0.1 NTU以下。二次微絮凝不但改变了胶体的Zeta电位,增加了絮凝效果,而且提高了对有机物和颗粒数的去除率,抽滤时间也相应缩短。     

低相对分子质量有机酸对无机纳米颗粒吸附-解吸Ca~(2+)的影响

为了探讨低相对分子质量有机酸对无机纳米颗粒吸附-解吸Ca2+的影响,采用超声-离心-冻融方法提取蒙山茶园老冲积黄壤的无机纳米颗粒(≤100 nm),用热力学方法和NaNO3、HCl溶液解吸法,分别研究了柠檬酸、苹果酸、草酸3种低相对分子质量有机酸对土壤无机纳米颗粒吸附-解吸Ca2+的影响。结果表明,土壤无机纳米颗粒对Ca2+的吸附量均随平衡溶液Ca2+质量浓度增加而增加。加入柠檬酸、苹果酸后,土壤无机纳米颗粒对Ca2+的吸附量变化趋势相似,而加入草酸后吸附量变化趋势不同。土壤无机纳米颗粒对Ca2+吸附量依次递减的各柠檬酸添加组为0.1 mmol/L、0.5 mmol/L、1 mmol/L、CK、5 mmol/L、10 mmol/L,各草酸添加组为CK、0.1 mmol/L、0.5 mmol/L、1 mmol/L、5 mmol/L、10 mmol/L。低浓度的柠檬酸和苹果酸能够提高非专性吸附态Ca2+的解吸,而草酸和高浓度的柠檬酸、苹果酸能够提高专性吸附态Ca2+的解吸。     

Application of ferrate（VI） in the treatment of industrial wastes containing metal-complexed cyanides ： A green treatment

Ferrate(VI) was employed for the oxidation of cyanide (CN) and simultaneous removal of copper or nickel in the mixed/complexed systems of CN-Cu, CN-Ni, or CN-Cu-Ni. The degradation of CN (1.00 mmol/L) and removal of Cu (0.095 mmol/L) were investigated as a function of Fe(VI) doses from 0.3–2.00 mmol/L at pH 10.0. It was found that Fe(VI) could readily oxidize CN and the reduction of Fe(VI) into Fe(III) might serve e ciently for the removal of free copper ions. The increase in Fe(VI) dose apparently favoured the CN oxidation as well as Cu removal. Moreover, the pH dependence study (pH 10.0–13.0) revealed that the oxidation of CN was almost una ected in the studied pH range (10.0–13.0), however, the maximum removal e ciency of Cu was obtained at pH 13.0. Similarly, treatment was carried out for CN-Ni system having the initial Ni concentration of 0.170 mmol/L and CN concentration of 1.00 mmol with Fe(VI) dose 2.00 mmol at various pH values (10.0–12.0). Results showed a partial oxidation of CN and partial removal of Ni. It can be observed that Fe(VI) can partially degrade the CN-Ni complex in this pH range. Further, Fe(VI) was applied for the treatment of simulated industrial waste/e uent waters treatment containing CN, Cu, and Ni.     

黄土高原“低荒”资源的成因及其开发对策

本区人口、土地和环境的矛盾尤为尖锐，土地生产力水平低，今后除严格法制人口增长外．还必须从内涵和外延上对农业资源进行充分合理的开发利用，提高土地生产力。本文在分析黄土高原区“低荒”资源数量的基础上，探讨了其成因和开发对策。     

低pH值,铝及钙铝比对斜生栅藻(Scenedesmus obliquus)谷胱甘肽含量影响研究

本文研究了低pH值条件下,铝及钙铝比对斜生栅藻生长及细胞中谷胱甘肽(GSH)水平的影响.结果表明,低pH值和铝对藻的生长具有抑制作用,而对细胞中GSH水平则有显著激发作用;当培养基中加入适量钙离子,一定程度降低藻细胞中GSH水平.这说明钙对低pH值及铝的毒害具有一定缓解作用,其缓解程度主要取决于钙与铝的相对量;并讨论了钙缓解作用的可能机理.     

家居环境PM2.5控制用空气滤料

针对目前家居环境净化PM2.5的要求,在现有空气过滤材料的基础上,探讨一种适合于家居环境移动式空气净化装置用低阻、高效和长寿命的过滤材料。采用实验研究的方法对常用玻纤滤纸以及驻极体空气过滤材料进行了过滤特性、电镜、孔径测试的对比实验研究。结果表明,当过滤风速为5 cm/s时,3种驻极体滤料对粒径≤4.5 μm的颗粒物的分级过滤效率要高于玻纤滤纸且都在90%以上,其过滤阻力在4.9~6.4 Pa之间,而高效滤纸的过滤阻力在57.8~78.6 Pa之间;在实验风速条件下,驻极体滤料对PM2.5的过滤效率和过滤阻力分别高于和低于高效玻纤滤纸;对驻极体滤料进行蒸馏水洗涤后,其对颗粒物的过滤效率下降,驻极体滤料静电效应具有不稳定特性;电镜测试发现,玻纤滤纸纤维层排布致密,纤维存在断裂现象,而驻极体滤料较为蓬松,无纤维断裂现象;孔径实验表明,驻极体滤料的平均孔径为玻纤滤纸的11.9~14.7倍,驻极体滤料具有良好的透气和容尘特性。     

用最长连续无降水日建立宁夏的干旱预测概念模型

在相关普查及分析各因子物理意义的基础上,建立了宁夏不同程度干旱预测的概念模型,结果表明,影响宁夏全区不同程度干旱的大气及海洋强信号并不一定是线性关系,与大气及海洋各系统之间的相互配置,特别是高层与低层之间、中高纬与低纬之间、大气与海洋之间、各大气与海洋系统的强、弱之间及相对位置之间的配置等都有着非常重要的关系。