Effects of Attapulgite Nano Zinc Oxide on Antioxidant Function and Immune Function in Spleen of Weaned Pigs

The experiment was conducted to explore the effects of attapulgite nano zinc oxide (ANZ) on antioxidant and immune functions in spleen of weaned piglets.210 weaned piglets of similar weight were randomly divided into 7 groups with 6 replicates in each group and 5 piglets per repeat.The treatments were control group (CON group,basal diet),antibiotic group (ANT group,basal diet+antibiotic),zinc oxide group (ZO group,basal diet+3 000 mg/kg zinc oxide),nano-zinc oxide group (NZO group,basal diet+800 mg/kg nano-zinc oxide),low,middle and high dose attapulgite nano zinc oxide groups (LANZ group,basal diet+700 mg/kg attapulgite nano zinc oxide;MANZ group,basal diet+1 000 mg/kg attapulgite nano zinc oxide;HANZ group,basal diet+1 300 mg/kg attapulgite nano zinc oxide).The results showed that:Compared with CON group,spleen index in ZO,MANZ and HANZ groups increased significantly (P<0.05).Compared with CON and ANT groups,the area of spleen cells in NZO,LANZ,MANZ and HANZ groups increased significantly (P<0.05).Compared with other treatment groups,the size of spleen cells in MANZ group increased significantly (P<0.05).Compared with CON,ANT,NZO and HANZ groups,superoxide dismutase (SOD) activity in MANZ group increased significantly (P<0.05).Compared with ZO and NZO groups,catalase (CAT) activity in LANZ,MANZ and HANZ groups increased significantly (P<0.05).Compared with ZO group,the content of malondialdehyde (MDA) in NZO,LANZ,MANZ and HANZ groups decreased significantly (P<0.05).Compared with CON group,the content of interferon-γ (IFN-γ) in ANT,MANZ and HANZ groups decreased significantly (P<0.05).Compared with CON,ANT,ZO and NZO groups,the content of tumor necrosis factor-α (TNF-α) in MANZ and HANZ groups decreased significantly (P<0.05).Compared with ANT group,the content of interleukin-1 β (IL-1 β) in MANZ group decreased significantly (P<0.05).Compared with ANZ、ZO and NZO groups,the content of interleukin-10 (IL-10) in MANZ and HANZ groups increased significantly (P<0.05).Compared with CON,ANT and ZO groups,the content of interleukin-12 (IL-12) in LANZ and MANZ groups increased significantly (P<0.05).In conclusion,attapulgite nano zinc oxide could increase organ index and cell size of spleen,improved the antioxidant enzymes activity in spleen,decreased the content of proinflammatory factors,increased the content of anti-inflammatory factors,and enhanced the antioxidant and immune functions of weaned piglets.The optimum addition level of attapulgite nano zinc oxide was 1 000 mg/kg in this experiment.     

金属纳米粒子配分函数形式的详细推导

运用热力学、统计物理学、复变积分等理论,对金属纳米粒子的热力学配分函数形式进行了详细的推导,得出了与随机矩阵理论修正项相匹配、适合数值计算的最终公式形式.     

Gas sensing properties and mechanism of zinc stannate thick film gas sensors by doping noble metal catalysts

Nano ZnSnO3 powders were prepared by the coprecipitation method, using ZnSO4·7H2O SnCl4·5H2O as the starting material. The ceramic powders were characterized by X ray diffraction and transmission electron microscopy. Pure and noble metal doped ZnSnO3 thick film gas sensors were fabricated by an indirect heating process and the gas sensing properties were tested. The reason for the above improvement was analyzed on a gas sensing mechanism and the basis of morphology observation of these thick film sensors. The results show that the sensitivities of these thick sensors to combustible gases, such as C2H5OH and H2, are greatly improved. Gas sensitivities of thick sensors with doping metallic irons, including Ag+ and Pd2+ to hydrogen gas, are fifteen times greater than that of pure ZnSnO3 thick film sensors. The grain size is inhibited and more gas holes cover the surface by doping metallic irons, the key reason for the improved gas sensing properties.     

纳米改性竹炭及其应用

本文介绍了纳米改性竹炭的技术原理和主要性能;阐述了该技术在化工行业、净化空气和农业等方面的应用前景;分析了纳米改性竹炭的经济和社会效益。     

壳聚糖-纳米氧化锌复合涂膜对甜樱桃采后生理和贮藏品质的影响

为研究壳聚糖-纳米氧化锌复合涂膜对甜樱桃贮藏期生理及品质的影响,以新鲜大连甜樱桃为材料,研究4℃条件下3种壳聚糖-纳米氧化锌复合涂膜处理(0.1%纳米氧化锌+0.2%壳聚糖、0.1%纳米氧化锌+0.5%壳聚糖、0.1%纳米氧化锌+0.8%壳聚糖)对甜樱桃的腐烂率、失重率、可溶性固形物、可滴定酸、维生素C(Vc)含量、呼吸强度、过氧化物酶(POD)活性、过氧化氢酶(CAT)活性、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量变化的影响。结果表明,0.1%纳米氧化锌+0.8%壳聚糖复配的壳聚糖-纳米氧化锌涂膜处理对甜樱桃果实的保鲜效果优于壳聚糖单膜处理(1.0%壳聚糖)。壳聚糖-纳米氧化锌复合涂膜处理能够使可溶性固形物、可滴定酸、Vc含量维持在较高水平,降低果实的腐烂率、失重率,有效延缓呼吸强度、MDA含量的上升及CAT活性的下降,抑制POD和SOD活性。在维持甜樱桃贮藏品质和延缓衰老方面,以0.1%纳米氧化锌+0.8%壳聚糖复配的壳聚糖-纳米氧化锌复合膜处理的保鲜效果最好。本研究结果为改性壳聚糖涂膜在甜樱桃贮藏保鲜中的应用提供了理论依据。     

耐磨三聚氰胺甲醛树脂的制备及性能表征

采用超声波法将5种纳米耐磨材料分散于三聚氰胺甲醛树脂(MF树脂),制备浸渍装饰纸层压板;并采用傅里叶变换红外光谱法和差示扫描量热法等对改性的MF树脂进行分析.结果表明:分散4次最合适;MF树脂最低耐磨转数为1600转,最高耐磨转数为2500转;耐磨材料的加入使得MF树脂的粘度、接触角增大,耐磨性能提高.     

Preparation and characterization of wood/montmorillonite nanocomposites

With montmorillonite (MMT) organically modified as organophilic MMT (OMMT) and water-soluble phenol formaldehyde resin (PF) as intermediate, Chinese fir (Cunninghamia lanceolata) wood/MMT nanocomposites (WMNC) were prepared via nano intercalation compounding and characterized by XRD, SEM and FTIR. Results show that: 1) the preparation of OMMT is very successful; 2) the self-made PF can effectively intercalate into MMT to increase markably its gallery distance and even exfoliate its nano silicate laminae; 3) the XRD analysis indicates that some exfoliated MMT enters the non-crystallized region of microfibrils in wood cell walls and the crystallinity degree of wood in WMNC decreases; 4) the SEM graphs show that multiform MMT exists in WMNC. Some grains block in wood cell lumen, some layers adhere to the wood surface of the inner cell wall and some exfoliated nanolaminae even insert into wood cell walls; and 5) the FTIR analysis suggests that MMT and wood in WMNC perhaps interact via certain chemical bonding.     

磁混凝技术在中纤板废水前处理中的应用

采用磁混凝技术处理中纤板废水.研究了磁粉、混凝剂和助凝剂的种类及其比率的影响.试验结果表明,使用A磁粉的磁混凝技术处理中纤板废水,化学耗氧量(COD)去除率最高可达88.03%,较单纯采用混凝技术COD去除率提高了52.25%;悬浮物(SS)去除率达98.91%,提高了约4%;色度去除率达98.01%,提高约3%.     

可食性涂膜在果蔬保鲜中的现状及研究进展

【目的】收集、整理和汇总可食性涂膜在果蔬保鲜中的现状与研究进展,综合分析不同涂膜材料处理后的效果,对采后及贮藏中生理指标进行概述,为可食性涂膜在果蔬中的广泛应用提供参考。【方法】收集、查阅国内外相关研究文献、农业及食品类官网信息和已有的研究成果,对近10余年来的资料进行汇总后对比分析,并进行统计。【结果】果蔬保鲜常用涂膜目前有多糖涂膜(魔芋葡甘聚糖和壳聚糖)、脂质涂膜(蜡质和石蜡)、蛋白质涂膜、复合材料涂膜及其他涂膜材料。果蔬经过涂膜处理后能够增强抗氧化酶活性,提高抗氧化能力,减少活性氧的产生,保持了果实品质和延长了贮藏期。用壳聚糖对南果梨和草莓进行涂膜,可分别延长果实采后贮藏期长达20 和12 d,且保持了较好的感官品质。【结论】多糖类、脂质类涂膜主要应用于易腐烂的水果,如蓝莓、草莓和葡萄,以及哈密瓜等鲜切水果的品质保鲜和延长贮藏期;而蛋白质涂膜主要应用于肉类(猪肉、鱼肉等)用于保持肉类的品质。     

液体纳米维生素对肉仔鸡生产性能和胴体品质的影响

试验选用480只1日龄健康艾维茵肉仔鸡。随机分为4组,每组设4个重复,每个重复30只。对照组饲喂基础日粮,3个试验组分别给予含液体纳米维生素4000、6000、8000倍稀释液的饮水。试验期为42d。试验旨在研究液体纳米维生素对肉仔鸡生产性能和胴体品质的影响。结果表明,液体纳米维生索能显著提高肉仔鸡的平均日增重、饲料利用率和出栏重（P〈0．01）,可显著降低肉仔鸡均日采食量和死亡率（P〈0．01）;屠宰试验测定表明,液体纳米维生素可显著提高肉仔鸡半净膛率、全净膛率、胸肌率和腿肌率（P〈0．01）,对屠宰率也有一定影响,但差异不显著（P〉0．05）。因此,液体纳米维生素能显著提高肉仔鸡的生产性能以及改善胴体品质．且较高水平的液体纳米维生素会产生较好的生产效率