Metal chelate molluscicides: The redistribution of iron diazaalkanolates from the gut lumen of the slug,Deroceras reticulatum (Müller) (Pulmonata: Limacidae)

Two related iron chelates, one toxic to slugs by ingestion, the other not, were introduced into the foregut of D. reticulatum. The subsequent movement and redistribution of the metal within the slug tissues was studied by labelling the chelates with the radioactive isotope ⁵⁵Fe. In slugs which survived treatment approximately half of the ⁵⁵Fe was voided in faeces. The iron retained became unevenly distributed, the highest concentration occurring in the digestive gland, irrespective of the chelate used. At high doses, slugs treated with tris(1-oxo-1,2-diazabutan-2-oxido)Fe(III) were fatally poisoned while those treated with the homologue, tris(1-oxo-1,2-diazaoctan-2-oxido)Fe(III) were not. Slugs killed by the toxic chelate consistently contained proportionally less iron in the digestive gland and proportionally more in the body wall and reproductive system. Dosing slugs already killed by carbon dioxide asphyxiation gave a similar pattern, suggesting that the greater mobility of the iron from the toxic chelate was not a function of the slugs' metabolism.     

锌、铁和维生素A互作对肉仔鸡血清和肝脏抗氧化效应的影响

试验选用360只健康1日龄艾维茵肉仔鸡(公、母混养),采用2×2×3三因子析因化设计,将360只试验雏鸡随机分成12组,每组设3个重复,每个重复10只鸡。锌的添加浓度为50、100mg/kg,铁的添加浓度为30、60mg/kg,维生素A的添加浓度为1500、3000、6000IU/kg。测定了肉仔鸡血清、肝脏谷胱甘肽过氧化物酶(GSH-Px)活性,过氧化氢酶(CAT)活性、铜锌超氧化物歧化(酶CuZn-SOD)活性,丙二醛(MDA)含量,以此来研究不同水平的锌、铁、维生素A同时添加,三者在肉仔鸡血清、肝脏抗氧化功能方面的互作效应。结果表明:锌、铁与维生素A三者互作对提高肉仔鸡血清CuZn-SOD活性影响极显(著P<0.01),对提高肉仔鸡肝脏GSH-Px活性和降低MDA含量影响极显(著P<0.01)。这说明锌、铁、维生素A三者之间在肉仔鸡抗氧化方面存在协同效应。     

Normal haematopoiesis,cellular components and stainable iron content in the bone marrow of camels (Camelus dromedarius)

Bone marrow samples were collected from the ribs of 20 healthy adult male Iranian camels (Camelus dromedarius). The bone marrow smears were stained using Wright's stain. Blood samples were collected at the same time for routine haematological examination. The development and morphology of the blood cells in the bone marrow of the camels were similar to those of other domestic species. The mean myeloid/erythroid ratio was 1.21, the mean erythroid percentage was 42.7% and the mean myeloid percentage was 52.0%. The mean percentage of other cells was 5.3%. The mean percentage of eosinophils in the myeloid series was higher than in other domestic species. Iron stores, estimated from Perl's stain, ranged from scant (1+) to moderate (3+) but most samples had 2+ iron content. All peripheral blood results were within reference ranges.     

空气净化网上光催化剂和活性炭相互增强净化能力的作用机理

采用浸涂法在活性炭空气净化网上负载纳米二氧化钛，在紫外光的照射下，净化网对一氧化碳、甲醛、硫化氢等污染物的净化能力明显增强，对比实验表明，在紫外光照射下光催化剂使被吸附的污染物发生降解反应而提高活性炭的净化能力。活性 吸附作用为光催化反应浓度环境，加速反应速率。     

复合镀铁技术与工程车辆发动机气缸的修复

通过介绍复合镀铁技术的特点,以工程车辆发动机气缸的实际工况为基础,进行快速模拟磨损对比试验,研究复合镀铁材料的磨损规律,并绘制了负荷-速度-磨损量三维曲面图。本文对复合镀铁材料的耐磨性进行较全面的评价,初步探讨了复合镀铁用于强化工程车辆发动机气缸的可行性。     

缺铁黄瓜地上部对根系适应性反应的调节

用营养液培养方法研究了黄瓜地上部对根系缺铁适应性反应的调节。缺铁导致植株根系Fe     

A rapid chronometric assay of peroxidase activity in citrus leaf discs

A rapid peroxidase assay is proposed, using 3-mm diameter leaf discs, and based on the chronometric measurement of the oxidation of ascorbic acid, which is detected by means of the appearance of the blue colour of the benzidine-coupled reaction.The proposed method is adequately reproducible and sensitive for the diagnosis of iron deficiency in citrus.     

动力学分光光度法测人参中的痕量铁

利用痕量铁在 pH =4.0的HAc-NaAc介质中能催化H2 0 2 ,氧化苯酚红的反应。在催化条件下 ,表观活化能增加 5 5 %的原理 ,建立了动力学分光光度法测定痕量铁的新方法。此法检出限为了 7.2× 1 0 - 4 μg/ml,线性范围为 0 .1～ 0 .8μg/ml,此法用于测定痕量铁 ,灵敏度高 ,重现性好。     

GROWTH AND IRON-MANGANESE RELATIONSHIPS IN DRY BEAN AS AFFECTED BY FOLIAR AND SOIL APPLICATIONS OF IRON AND MANGANESE IN A CALCAREOUS SOIL

Manganese (Mn) deficiency may be induced by adding large quantities of iron (Fe), provided that soil manganese is marginally deficient. Results of a greenhouse study showed that iron soil application did not influence shoot dry matter yield of dry bean due to the fact that the iron:manganese ratio in aerial parts of dry bean was higher than 0.4. A foliar spray of 2% iron sulfate significantly reduced it probably due to the high level of shoot iron and iron:manganese ratio greater than 4. Iron application decreased concentration/uptake of shoot manganese due to the iron-manganese antagonistic relationships. Mangenese soil application is not an effective method in correction of manganese deficiency induced by iron fertilizers. Iron did not affect root manganese uptake, indicating that manganese absorption was not affected by iron application. Both manganese/iron soil tests are recommended in calcareous soils with manganese soil test in marginal range.