苏云金杆菌微型颗粒剂对玉米鳞翅目害虫的防治效果

包括草地贪夜蛾、亚洲玉米螟、棉铃虫在内的鳞翅目害虫是安徽省夏玉米生产上发生最重、为害最大的一类虫害,为探索其高效绿色的防控技术,分别于心叶初期和心叶末期,施用两种苏云金杆菌G033A和PS3微型颗粒剂,研究其对玉米鳞翅目害虫防治效果、心叶保护效果及产量影响。结果表明:心叶初期以人工撒施方式,按300、450、600 g/667 m~2剂量施药后7 d,G033A微型颗粒剂对害虫的防效分别为71.62%、77.18%和81.54%,PS3微型颗粒剂的防效分别为75.00%、83.73%和86.91%;G033A微型颗粒剂对玉米心叶保护效果分别为59.42%、68.86%和71.72%,PS3微型颗粒剂分别为65.08%、72.64%和75.50%,持效期均可达14 d。心叶末期以无人机撒施方式,按照1、1.5、2 kg/667 m~2剂量施药后7 d,G033A微型颗粒剂对害虫的防效分别为76.90%、81.22%和86.02%,PS3微型颗粒剂分别为81.71%、84.89%和89.20%,药后14d防效均开始下降;挽回产量损失率G033A微型颗粒剂分别为5.17%、7.07%和9.09%,PS3微型颗粒剂分别为5.56%、7.47%和9.57%。相对于可湿性粉剂,微型颗粒剂产品持效期更长、防治效果更好;相同剂量处理下,药后7、14 d,PS3微型颗粒剂防效均高于G033A微型颗粒剂。G033A和PS3微型颗粒剂防治玉米鳞翅目害虫较好,可有效挽回产量损失,人工撒施推荐剂量均为300~600 g/667 m~2、无人机撒施推荐剂量均为1~2 kg/667 m~2。

水体微型颗粒的流式细胞术测定

应用流式细胞术 (FCM)对水体中不同粒径级微型颗粒的数量、百分比及随时间变化进行了初步研究;仪器经流速校正 ,样品经过滤 ,外参法测定;结果表明FCM可快速。

微流体技术制备功能性微型颗粒的研究进展

系统地阐述了近几年来微流体制备微型颗粒的现状并探讨了微流体制备微型颗粒过程中的粒径、形态等的控制工艺。采用微流体技术可以制备有机、聚合物、无机等多种类型的微型颗粒,这些微型颗粒在生物、医学、电子、光学等领域有着广阔的应用前景。

溶气气浮系统用于去除养鱼水体微型固体颗粒物的试验研究

本文设计了一套溶气气浮分离系统,并对影响净化效果的工艺参数和结构参数进行了初步的研究。试验结果证明,溶气气浮分离系统对养鱼水体的微型固体颗粒有较好的去除效果,并能改变水体的pH值,增加溶氧;气体流量、液体流量、液位高、溶气压力、气浮柱内的释气柱高度对气浮效果都有明显影响。其中最为显著的因子是液位高度。COD和浊度的去除率分别由0.6米时的16.13%、28.15%增加到1.2米时的54.47%、71.48%。通过调控参数因子,浊度去除率可达71.48%,COD的去除率为54.47%。

驯化主养鳙鱼种的试验

本文报导北方寒冷地区用微型颗粒饲料在 5 6亩的池塘中主养鳙鱼种 ,经 131d的饲养 ,共产鱼种 2 4 33kg ,平均亩产 4 34 5kg ,其中鳙鱼亩产 30 5kg ,占总产量的 70 2 % ,平均尾重 76 2 5g ,成活率 80 %。

Enhanced antitumor efficacy on hepatoma-bearing rats with adriamycin-loaded nanoparticles administered into hepatic artery

AIM: To investigate the antitumor activity of adriamycin (ADR) encapsulated in nanoparticles (NADR) and injected into the hepatic artery of hepatoma-bearing rats.METHODS: NADR was prepared by the interfacial polymerization method. Walker-256 carcinosarcomas were surgically implanted into the left liver lobes of 60 male Wistar rats, which were divided into 4 groups at random (15 rats per group). On the 7th day after implantation, normal saline (NS), free ADR (FADR), NADR, or ADR mixed with unloaded nanoparticles (ADR+NP) was respectively injected via the hepatic artery (i.a.) of rats in different groups. The dose of ADR in each formulation was 2.0 mg/kg body weight and the concentration was 1.0 mg/mL. Survival time, tumor enlargement ratio, and tumor necrosis degree were compared between each group.RESULTS: Compared with the rats that received NS i.a.,the rats that received FADR or ADR+NP acquired apparent inhibition on tumor growth, as well as prolonged their life span. Further significant anticancer efficacy was observed in rats that received i.a. administration of NADR. Statistics indicated that NADR brought on a more significant tumor inhibition and more extensive tumor necrosis, as compared to FADR or ADR+NP. The mean tumor enlargement ratio on the 7th day after NADR i.a. was 1.106. The mean tumorbearing survival time was 39.50 days. Prolonged life span ratio was 109.22% as compared with rats that accepted NS.CONCLUSION: Therapeutic effect of ADR on liver malignancy can be significantly enhanced by its nanopaticle formulation and administration via hepatic artery.

加快鱼类生长新法

新加坡国立大学专家实验证实,利用3％的淡咸水喂养鲤鱼,可提高其成活率和生长率。如在鱼饲料中再加入0.

国外鱼虾苗开口饲料的加工技术

鱼虾开口饲料也叫微粒饲料,它根据苗种的生活习性,生理机能及不同生长期的营养需求进行加工,同时还需满足微粒饲料悬浮性×水中稳定性,低溶性、易消化吸收及不同粒度等要求。国外常用微粒饲料加工技术如下:1、饲料加工工艺中,装置颗粒粉碎机。

Preparation and Crystal Modification of Ibuprofen-Loaded Solid Lipid Microparticles

An emulsion-congealing technique is used to prepare solid lipid microparticles （SLM） containing ibuprofen with glyceryl behenate, tripalmitin and beewax as excipients. The difference of the solubility parameters between the excipients and ibuprofen are used to analyze their compatibility. Both the solubility parameter analysis and the experimental results show that glyceryl behenate is the best among the three excipients. The solid particles disperse well in aqueous phase when the drug loading reaches 10% （relative to lipid only）. Glycerides exhibit marked polymorphism and their rapid rates of crystallization accelerate the formation of metastable crystal modification. The metastable crystal modification characterizes high drug loading capacity but less stability. Increasing the content of lipophilic drug in a lipid matrix facilitates the transformation of excipients to more stable polymorphic forms.

Properties and interfacial microstructure of cement-based materials with composite micro-grains

Silica fume, fly ash and nano-fiber mineral materials (NR powder) are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing systems, namely, spherical grading system and nano-fiber reinforced system were designed. Properties and interfacial microstructure of the two systems were studied according to secondary interface theory. It was shown that nano-fiber mineral materials can improve the grain grading of the admixture, increase the density of the system, improve the microstructure of the interface and the hardened paste, and enhance the uniformity of cement-based materials mixed with composite micro-grains and greatly increase their wearable rigidity and flexure strength. In this paper, two kinds of interface models, including spherical grain model and nano-fiber reinforced interface model of the cement-based materials mixed with composite micro-grains, were brought forward.

Modulation of Soil Particle Size and Nutrient Availability in the Maize Rhizosheath

Root exudates,microorganism colonization and soil aggregates together form the rhizosheath,a special cylinder of micro-ecosystem adhering to the root surface.To study how the rhizosheath affects soil structure and nutrient distribution,we analyzed the impact of maize rhizosheath on soil particle size and nutrient availability in pot and field experiments.The results showed that there was a significant size decrease of soil particles in the rhizosheath.Meanwhile,the soil mineral nitrogen in the rhizosheath was significantly higher than that in the rhizosphere or bulk soil at tasseling and maturity stages of maize.The contents of Fe and Mn were also differentially altered in the rhizosheath.Rhizosheath development,indicated by a dry weight ratio of rhizosheath soil to the root,was relatively independent of root development during the whole experimental period.The formation of maize rhizosheath contributed to the modulation of soil particle size and nutrient availability.The subtle local changes of soil physical and chemical properties may have profound influence on soil formation,rhizospheric ecosystem initiation,and mineral nutrient mobilization over the long history of plant evolution and domestication.

On the Theory of Fragmentation Process with Initial Particle Volume

The problem of fragmentation(disintegration) process is theoretically studied with allowance for the initial particle volume. An exact analytical solution of integro-differential model governing the fragmentation phenomenon is obtained. The key role of a finite initial volume of particles leading to substantial changes of the particle-size distribution function is demonstrated.