Study on Effect of Iron in Anther Media of Early Japonica Rice in Cold Region

In this study, through vitro culturing anthers of 7 F1 progenies of early Japonica rice in cold region on medium with different Fe2+ contents, it was found that Fe2+ content generated greater impacts on the induction rate and green plantlet differentiation. The result demonstrated that if Fe2+ increased from 32 to 40 mg/kg, the induction rate of early Japonica rice anther culture in N6 culture media was more then 1.4 times higher than that in N6 culture media containing 5.6 mg/kg Fe2+. In this concentration range, the induction rate increased with the increase of Fe2+ content, while if the concentration was over this concentration range, the induction rate decreased with the increase of Fe2+, showing single peak distribution. When the Fe2+ was 40 mg/kg in differentiation medium, the differentiation rate decreased dramatically. The green plantlet differentiations of callus which were induced on culture media containing 32-40 mg/kg Fe2+ were different, when they were cultured on MS culture media, and 85.7% materials could increase green plantlet productivity to about 7.8%. Therefore, increasing Fe2+in induction media properly could increase anther culture efficiency of early Japonica rice in cold region.

Mutual effects of nitric oxide and iron on the growth of marine algae

Experiments on the effects of nitric oxide （NO） and iron on the growth of marine microalgae Skeletonema costatum were conducted. The results are as follows： exogenous NO could increase the growth rate of marine algae and raise the biomass remarkably under iron-deficient conditions. But it was a complicated process that the phytoplankton growth was influenced by NO and iron, which was controlled by the NO concentration, the nutrition level of the culture medium and the iron concentration, etc. Meanwhile, the iron concentration in the medium also has a direct influence on the growth and NO release capacity of the algae. Therefore, the effects of NO and iron on the growth of marine phytoplankton were mutual.

Effect of Treatment Temperature on Iron Nitride Foils Irradiated with Nitrogen Plasma

We investigated the effect of treatment temperature on the magnetic property of iron nitride foils irradiated with nitrogen plasma. The iron nitride foils irradiated with nitrogen plasma were composed of ε-Fe2/3N, γ'-Fe4N and γ nitrogen austenite in α-Fe of the matrix. The saturation magnetization of the iron nitride foils decreased with increasing the surface temperature. The coercive force of the iron nitride foils increased with increasing the surface temperature.

Sensitivity of Barley Varieties to Aluminum Ions: Separately Effects and Combine with Iron Ions

Differences in the barley varieties have been revealed from tolerance to iron (Fe) and aluminum (Al) ions as well as to their combined effect. Received results allowed to separate barley variety into some (three) groups: the first—Al-tolerant varieties, the second—Al-sensitive ones and third—moderately resistant variety. The increased concentration of Fe had practically no effect on biometric (seed germination energy) and cytogenetics (frequency of chromosome aberrations and mitotic index) parameters as compared to the reference values. At the same time, iron ion significantly reduces the phytotoxic effect for Al-tolerant varieties in case of these elements jointly presented in solution.

M1 Site Splitting Due to Next Nearest Neighbor Effects and Ferric Iron in Tetrahedral Site in Clinopyroxene Megacrysts

It is well known that in pyroxene structure, there are two metal sites, M1 and M2.Generally speaking, ferrous iron in each of these sites would normally be expected to give rise to a doublet. However, anomies have been found in the relative areas of the peaks in the room temperature spectra of some clinopyroxene (CPX) when the above assigninent is folowed. Ac-cording to the calculation of Next Nearest Neighbor configurations of divalent cations in M1,we found that the four configurations of M1 can be divided into two groups. One group is 3Ca configuration that increases with the content of Ca (p. f. u); the other group is made up of three No-3Ca configurations that decrease with the content of Ca. The two groups contribute to the spectrum structure of M1, so in this study we fit two doublets for ferrous iron in M1.Though there were severa reports on Fe3+ in tetrahedral site previously, it wa not sure that Fe3+ occupies the T site is a universal fact in CPX, despite of the content of A1. We found that the Fe3+ in the T site fitted by Medauer spectroscopy is negatively correlated to the Si content in the T site and positively correlated to the Fe3 + in the T site estimated on the suppo-sition that Fe3+ and Al occupy the T site randomly. If it is true, it is important in the model-ing of ion exchange geobarometries and gepthermornetries.

Cost effectiveness of routine duodenal biopsies in iron deficiency anemia

AIM To investigate the cost effectiveness of routine small bowel biopsies(SBBs) in patients with iron deficiency anemia(IDA) independent of their celiac disease(CD) serology test results.METHODS We used a state transition Markov model. Two strategies were compared: routine SBBs during esophagogastroduodenoscopy(EGD) in all patients with IDA regardless their celiac serology status(strategy A) vs SBBs only in IDA patients with positive serology(strategy B). The main outcomes were quality adjusted life years(QALY),average cost and the incremental cost effectiveness ratio(ICER). One way sensitivity analysis was performed on all variables and two way sensitivity analysis on selected variables were done. In order to validate the results,a Monte Carlo simulation of 100 sample trials with 10,and an acceptability curve were performed.RESULTS Strategy A of routine SBBs yielded 19.888 QALYs with a cost of $218.10 compared to 19.887 QALYs and $234.17 in strategy B. In terms of cost-effectiveness,strategy A was the dominant strategy,as long as the cost of SBBs stayed less than $67. In addition,the ICER of strategy A was preferable,providing the cost of biopsy stays under $77. Monte Carlo simulation demonstrated that strategy A yielded the same QALY but with lower costs than strategy B. CONCLUSION Our model suggests that EGD with routine SBBs is a cost-effective approach with improved QALYs in patients with IDA when the prevalence of CD is 5% or greater. SBBs should be a routine screening tool for CD among patients with IDA,regardless of their celiac antibody status.

Effect of Vitamin C Supplementations on Iron Deficiency Anemia in Chinese Children

A total of 65 children with mild iron deficiency anemia (IDA) were divided into 5 groups, and received 0, 25, 50, 100 and 150 mg/day of vitamin C (VC) respectively every day for 8 weeks. Hemoglobin, serum ferritin, free erythrocyte and hematocrit were determined every week. At a daily average intake of about 30 mg of VC and 7.5 mg of Fe, the results of the study indicate that: (1) VC supplement alone could effectively control children's IDA, and a dose-dependant relationship was observed. (2) 50 mg/day of VC is the most efficient dosage and 6 weeks is the shortest time for an effective therapy. (3) With a diet predominately comprised of plant foods, it is suggested that appropriate dose of VC should be supplemented for the children during winter and spring in northeastern areas of China.

Effect of soaking time of dithionite-citrate-bicarbonate solution on strength and deformation characteristics of lateritic soil

This study aimed to reveal the influence of different free-iron-oxides contents on the strength and deformation characteristics of in situ lateritic soil.A test method that combined the selective chemical dissolution method and in situ Ménard pressuremeter test(PMT)was proposed.The soaking time in dithioniteecitrateebicarbonate(DCB)solution was used as a variable to control the free-iron-oxides content in lateritic soil.Then,the in situ lateritic soil boreholes with different soaking time were tested by PMT.The results showed that the in situ horizontal pressure p0,critical edge pressure pf,ultimate pressure prediction pl,pressuremeter modulus Em,shear modulus Gm,and foundation-bearing capacity f0k of lateritic soil decreased rapidly after immersing in DCB solution within 1e4 d.With increasing soaking time,the decrease rate reduced gradually.Moreover,the relationship curve between free-iron-oxides content and soaking time declined rapidly and then stabilized,and the free-iron-oxides content at the inflection point was 30.11 g/kg.When the free-iron-oxides content changed to the inflection point,the free-iron-oxides that played a cementing role was largely removed,indicating that the effective cementing iron-content of Miaoling lateritic soil was about 52.9%.This study demonstrated that the proposed test method can determine the influence of free-iron-oxides content on the strength and deformation characteristics of lateritic soil.

The Effects of High Energy and Micronutrient Supplementation on Iron Status in Nutritionally at Risk Infants

The study assessed the effects of supplementary feeding over 180 consecutive days on iron status of infants and toddlers at six tea plantation in West Java, Indonesia. The design used was a clinical trial: two eohorts (i.e., 12 and 18 months old children) and three treatment groups (i.e., energy + micronutrient, micronutrient alone, and placebo) per cohort. Every day except Sunday, the infants attended day-care centers. Twenty four centers and 136 infants were selected. The infants were screened for weight and length and those meeting the criteria (i.e., <-1 SD of length-for-age, and between -1 and -2 SD of weight-for-length of the NCHS reference) were included. The experimental unit was the day-care centers (DCC), where each DCC was randomly assigned to one of the three treatment. As expected, groups of energy + micronutrient and micronutrient alone of the 12 months cohort experienced a significant upward shift in hemoglobin, ferritin and TS and a downward change in FEP, while the values for the group of placebo remain about the same as at base line. In the first 6 month of treatments, the ANOVA for each iron indicator yielded significant main effects of treatment (P<0.01) and for Hb with (P =0.059) on 12 months cohort. On the other hand, the main effects of treatment on hemoglobin, TS, ferritin and FEP were not significant for the 18 months cohort. In the second 6 month of treatments, the only significant of the treatment effect (P<0.01) was in serum ferritin on 18-month cohort. Under these circumstances, energy has a positive role in improving iron stores. It is likely that the equilibrium of hemoglobin and each iron indicators were reached in 6 months of treatment except ferritin still continued to increase up to 12 month. The effects of treatment on the improvement of iron status was stronger in 12 months than in 18 months

Physiological Effects of Iron Deficiency on Pyrus pashia Buch-Ham

Pyrus pashia Buch-Ham, a wild specie was used to investigate the physiological effects of iron deficiency in culture solution. The result showed that Chla, Chlb, total chlorophyll content and photosynthesis rate(Pn) decreased sharply, and the decrease of Pn was prior to that of Chl content under the iron deficiency. The iron deficiency symptoms were visible when the iron concentration in culture medium was less than 25 μmol L-1. Peroxidase(POD) and catalase(CAT) activity in iron-deficient leaves declined significantly, and POD was more sensitive than CAT to Fe deficiency. However, the positive correlation between CAT activity and Chl content was more significant than that between POD activity and Chl content. The content of nutrient elements in Fe-deficient leaves, which changed irregularly, were higher than that in normal leaves. There were a most significant positive correlation between active Fe and Chl content, and between active Fe and Pn respectively. Therefore, active Fe could be useful physiological predicting index for diagnosis.

齐大山铁矿东帮边坡空间形态优化

针对齐大山铁矿东帮边坡空间形态优化问题,在分析边坡工程地质条件的基础上,将极限平衡法与数值模拟法相结合,评价原设计到界边坡稳定性,优化设计到界边坡的形态参数,探讨追踪距离对边坡三维稳定性的影响规律。研究结果表明:采用逐水平优化方法设计的到界边坡角为46°,每阶段的边坡二维稳定性系数均满足安全储备系数要求;边坡的三维稳定性系数与追踪距离呈负相关指数函数关系,当追踪距离为50 m时,齐大山铁矿东帮到界边坡角可设计为48°,整体边坡角提高了2°,经济效益显著。

新世纪以来国际铁矿石价格波动及对中国的启示

结合国际铁矿石市场基本概况及新世纪以来铁矿石价格波动的演变历程,分析国际铁矿石价格相关内容,探讨国际铁矿石期货市场现状及中国在铁矿石国际贸易中的地位。从钢铁行业、经济传导效应、通货膨胀视角分析国际铁矿石价格波动对中国宏观经济的影响,并提出相关建议。要从提升国内铁矿石资源保障能力,建立国内大循环回收利用体系,构建多元进口供应体系,完善商品定价基准监管制度入手,促进中国铁矿石期货交易市场的深化发展,以有效应对国际铁矿石价格的波动,稳定市场铁矿石供应。

生物炭改性及其对除草剂污染水体和土壤修复的研究进展

除草剂已被大量使用于现代农业生产,而长期使用除草剂可能造成其在土壤中大量残留,或通过降水、淋溶和径流污染水体,因此引发环境污染问题和食品安全问题。生物炭作为一种绿色、高效的吸附剂已被广泛用于修复有机物污染水体和土壤。本文介绍了酸碱、有机物和金属盐浸渍改性,纳米零价铁和微生物负载改性等生物炭改性方法;综述了改性生物炭在除草剂污染修复中的应用情况,对比分析了生物炭改性前后的修复效果;探讨了改性生物炭自身特性、环境条件对改性生物炭修复除草剂污染的影响及机制。未来仍需对改性生物炭在除草剂污染修复过程中的稳定性、长效性和安全性等方面开展研究。

一种适用于随钻核磁天线的磁芯材料

介绍了一种随钻核磁天线的铁粉芯磁芯材料,该材料具备高饱和磁通密度,并具备较低的介电损耗,并具备高绝缘强度,并在强磁环境下不产生磁致伸缩效应,较好的解决了随钻核磁测井仪探头敏感区域设计需求。

Efficiency and Effectiveness Method versus ε-NTU Method with Application in Finned Flat Tube Compact Heat Exchanger with Water-Ethylene Glycol as Nanofluid Base of Iron Oxide Nanoparticles

This work aims to establish comparisons between two models used for the performance of heat exchangers. The chosen system, in this case, consists of a heat exchanger used in automotive radiators flat finned tube type. Water and ethylene glycol compound as base fluid and volume fractions of iron oxide nanoparticles (Fe3O4) are used as a refrigerant. The quantities determined in this work are the nanofluid exit temperature, the air exit temperature, the absolute error between the models for heat transfer rate, and Effectiveness. The quantities that constitute parameters, independent variables, are the airflow, represented by the Reynolds number, and the iron oxide volume fraction. Ethylene Glycol 50% compound has slightly better thermal performance than pure water and reduces the reactive effect of water on the environment, increasing the average life of the equipment. The absolute relative error between the models is less than 20% and presents maximum values with the increase of the nanoparticle volume fraction and growth in the Reynolds number for the air.

乙二胺四乙酸铁钠对腌渍黄瓜理化性质及补铁效果研究

铁强化食品可以有效地减少全球铁缺乏症的流行,酸性物质的摄入可提高食品中铁元素的生物利用率。该研究以腌渍黄瓜为研究对象,探究乙二胺四乙酸铁钠(NaFeEDTA)对腌渍黄瓜理化性质及补铁效果的影响。结果表明,添加NaFeEDTA组腌渍黄瓜的还原糖利用率提高,pH整体呈下降趋势,且微生物活跃期更长,有利于酸性物质的产生;NaCl组的总酸含量在10d趋于稳定,其余发酵组在13~16d趋于稳定,添加0.15%NaFeEDTA组的总酸含量最高,为0.39g/100mL;腌渍黄瓜中主要有机酸为苹果酸和柠檬酸,且添加NaFeEDTA组含量均高于对照组,除此之外,0.15%NaFeEDTA组有机酸种类和含量最多,分别达到9种及180.64 mg/100 g;通过扫描电镜及感官评价,结果显示,NaCl组出现不同程度的组织收缩和分层现象,添加NaFeEDTA后该现象有所缓解,且0.15%NaFeEDTA组组织形态及感官评分(95.2分)最佳;通过对大鼠体质量以及血红蛋白的测定,证明NaFeEDTA腌菜可通过口服的方式有效进行补铁;对大鼠脾脏进行组织形态观察,证明NaFeEDTA腌菜中的铁元素有着较好的吸收率;实验证明,0.15%NaFeEDTA组补铁效果最佳。该研究为实现铁强化腌渍蔬菜并增加其吸收率提供一定的理论基础。

长江口-东海陆架黏土中高活性铁的富集效应及环境控制机制

铁元素的化学相态分析是深入理解沉积物的来源、环境演化以及铁参与的生物地球化学循环的关键手段,但不同粒级沉积物中铁化学相态研究薄弱,制约了表生铁循环的研究认知。本文选择长江口-东海陆架表层沉积物,通过六步提取法分析沉积物全样及其黏土组分中总铁(FeT)、高活性铁(FeHR)、弱活性铁(Fe_(PR))和不活性铁(Fe_(U))的含量,含量均遵循Fe_(HR)>Fe_(PR)>Fe_(U)。全样中Fe_(T)和Fe_(HR)的含量与平均粒径、黏土、有机碳和铝含量密切相关,表明富含有机质的黏土矿物易于富集高活性铁;相较于全样,黏土组分中Fe_(HR)/Fe_(T)比值升高10%,而Fe_(PR)/Fe_(T)比值则降低10%,反映黏土组分对高活性铁的富集效应。河口动力环境基本控制沉积物中Fe的相态分布,长江口最大浑浊带沉积物全样中Fe_(T)和Fe_(HR)含量较高,且受粒度的影响显著;黏土组分可以显著消除粒度效应的影响,Fe_(T)和Fe_(HR)被大量截留在最大浑浊带前缘的河口低盐度区域;而在中高盐度的口外区域,Fe的来源相对稳定,主要为富Fe_(HR)的长江源和贫Fe_(HR)的陆架源沉积物混合。本研究揭示黏土组分在流域-河口-陆架的迁移可能主导了高活性Fe在陆海界面的分布和循环过程,这对深入理解入海颗粒态Fe的源汇过程、地球化学循环及其环境效应有重要参考价值。

多糖铁复合物联合维生素D治疗妊娠期缺铁性贫血的效果

目的:探讨多糖铁复合物联合维生素D治疗妊娠期缺铁性贫血的效果。方法:回顾性选取2021年1月—2023年1月东莞市莞城医院收治的223例妊娠期缺铁性贫血患者。根据治疗方法的不同将其分为对照组(112例)和研究组(111例)。对照组给予多糖铁复合物,研究组在对照组基础上给予维生素D。比较两组临床疗效,治疗前、治疗3个月后血常规指标、铁代谢指标及不良反应。结果:研究组总有效率高于对照组,差异有统计学意义(P<0.05)。治疗3个月后,研究组血红蛋白(Hb)、平均红细胞体积(MCV)及红细胞计数(RBC)均高于对照组,促红细胞生成素(EPO)低于对照组,差异有统计学意义(P<0.05)。治疗3个月后,研究组血清铁(SI)和转铁蛋白饱和度(TAST)均高于对照组,转铁蛋白(TRF)低于对照组,差异有统计学意义(P<0.05)。两组不良反应发生率比较,差异无统计学意义(P>0.05)。结论:在妊娠期缺铁性贫血中,补充维生素D可改善患者贫血情况、血常规及铁代谢指标,利于降低EPO水平,且应用的安全性较好。

基于热分析技术的球墨铸铁球化率和收缩特性预测

针对球铁生产中存在的缩孔、缩松和球化不良等铸造缺陷导致废品率较高的问题,开展基于热分析技术的球铁球化率和收缩特性的预测研究。使用特定的热分析样杯进行铁液取样分析,在浇注目标成分铁液后,多路温度采集系统记录试样凝固温度曲线,计算了液相线温度TL、共晶最低温度TEU、共晶最高温度TER特征温度,并以这些特征值为变量,通过多元线性回归方法建立了预测收缩率和球化率的数学模型。经现场试验测试,采用模型预测收缩率和球化率的平均误差分别不超过1%和2%。

生态棒间隔距离对铁尾矿坡面减流减沙效应的影响

中国铁尾矿库的排放量大而综合利用率低,遗留的铁尾矿库形成大面积裸露库面和边坡,易引发水土流失、边坡滑塌等危害。为明确边坡生态修复中生态棒拦挡措施的水土流失防治机理,该研究以张宣铁矿区尾矿库边坡为对象,采用人工模拟降雨,研究不同间隔生态棒拦挡措施的减流减沙效应。结果表明:坡度25°、30°,30~90 mm/h雨强下,1)不同间隔生态棒拦挡措施下初始产流时间较裸坡分别增加0.44%~57.76%、1.08%~39.14%,且随生态棒间隔、坡度、雨强的增大而减少;减流效应分别为-2.79%~80.68%、12.67%~76.45%,随雨强增大而减小,30 mm/h雨强下随生态棒间隔缩短呈增强趋势,60、90 mm/h雨强下无明显规律变化;径流流速削减效应分别为20.78%~55.12%、20.16%~41.57%,随生态棒间隔缩短呈增强趋势,随坡度增大而降低,同时0.67 m间隔削减坡面流速效应最佳;2)减沙效应分别为-127.47%~71.57%、-287.19%~62.01%,减沙效应弱于减流效应;3)30 mm/h雨强下累积径流量、侵蚀量随生态棒间隔的缩短而减少,60、90 mm/h雨强下规律不明显;且90 mm/h雨强下,坡度30°的累积侵蚀量显著大于坡度25°;4)对产流产沙指标进行Pearson相关分析,表明生态棒拦挡措施在坡面减流、削减流速方面发挥关键作用,雨强对产流产沙的影响处于主导地位,坡度处于辅助地位;5)建议坡度25°、30°,雨强30、90 mm/h时选择0.40 m生态棒间隔,雨强60 mm/h时选择1.00 m生态棒间隔。研究结果可为铁尾矿边坡生态修复中生态棒拦挡措施的科学应用提供参考依据。