一种多维并行报文分类算法

位并行、位向量和聚合位向量算法通过对多个域进行并行处理加快分类速度,但三者内存占用太大,不适用于大规则集。为此,提出一种压缩位并行算法,通过报文分类压缩每个域上的重复规则并重新组织规则集,从而缩短位图中位串的长度,减少内存空间的占用。实验结果证明,该压缩位并行算法在不影响运行速度的前提下,明显减少了空间占用。     

实时图像处理器乒乓帧存结构

利用TMS320VC33,EPF10K50和CY7C106IBV33研制了基于SRAM“乒、乓”帧存结构的硬件电路,并分析了工作时序和设计重点。在Quartus1I8．0及CC4．1的开发环境下,进行了VHDL,AHDL,C语言驱动和图像处理程序的编写和调试。结果表明,该系统在1280×1024@60Hz模式下能够稳定地工作,已得到了批量应用。     

Microglial Cell Activation Increases Saturated and Decreases Monounsaturated Fatty Acid Content,but Both Lipid Species are Proinflammatory

Neuroinflammation is a component of age-related neurodegenerative diseases and cognitive decline. Saturated (SFA) and monounsaturated (MUFA) fatty acids are bioactive molecules that may play different extrinsic and intrinsic roles in neuroinflammation, serving as exogenous ligands for cellular receptors, or endogenous components of cell structural, energetic and signaling pathways. We determined the fatty acyl profile of BV2 microglial cells before and after acute activation with lipopolysaccharide (LPS). We also investigated the effect of SFA and MUFA pretreatment on the production of an invasive, neurotoxic phenotype in BV2 cells. Acute activation of BV2 microglia resulted in an increase in the relative content of SFA (12:0, 16:0, 18:0, 20:0, 22:0, and 24:0 increased significantly), and a relative decrease in the content of MUFA (16:1n7, 18:1n7, 18:1n9, 20:1n9, 24:1n9 decreased significantly). In agreement, the major stearoyl-CoA desaturase (SCD) isoform in BV2 cells, SCD2, was significantly down-regulated by LPS. We next treated cells with SFA (16:0 or 18:0) or MUFA (16:1n7 or 18:1n9), and found that levels of secreted IL6 were increased, as was secreted MMP9-mediated proteolytic activity. To test the functional significance, we treated SH-SY5Y neuronal cells with conditioned medium from BV2 cells pretreated with fatty acids, and found a small but significant induction of cell death. Our findings suggest differential intrinsic roles for SFA and MUFA in activated microglial cells, but similar extrinsic roles for these fatty acid species in inducing activation. Expansion of SFA is important during microglial cell activation, but either supplemental SFA or MUFA may contribute to chronic low-grade neuroinflammation.     

A Novel 1,8-Naphthyridine-2-Carboxamide Derivative Attenuates Inflammatory Responses and Cell Migration in LPS-Treated BV2 Cells via the Suppression of ROS Generation and TLR4/Myd88/NF-κB Signaling Pathway

Novel 1,8-naphthyridine-2-carboxamide derivatives with various substituents (HSR2101-HSR2113) were synthesized and evaluated for their effects on the production of pro-inflammatory mediators and cell migration in lipopolysaccharide (LPS)-treated BV2 microglial cells. Among the tested compounds, HSR2104 exhibited the most potent inhibitory effects on the LPS-stimulated production of inflammatory mediators, including nitric oxide (NO), tumor necrosis factor-α, and interleukin-6. Therefore, this compound was chosen for further investigation. We found that HSR2104 attenuated levels of inducible NO synthase and cyclooxygenase 2 in LPS-treated BV2 cells. In addition, it markedly suppressed LPS-induced cell migration as well as the generation of intracellular reactive oxygen species (ROS). Moreover, HSR2104 abated the LPS-triggered nuclear translocation of nuclear factor-κB (NF-κB) through inhibition of inhibitor kappa Bα phosphorylation. Furthermore, it reduced the expressions of Toll-like receptor 4 (TLR4) and myeloid differentiation factor 88 (MyD88) in LPS-treated BV2 cells. Similar results were observed with TAK242, a specific inhibitor of TLR4, suggesting that TLR4 is an upstream regulator of NF-κB signaling in BV2 cells. Collectively, our findings demonstrate that HSR2104 exhibits anti-inflammatory and anti-migratory activities in LPS-treated BV2 cells via the suppression of ROS and TLR4/MyD88/NF-κB signaling pathway. Based on our observations, HSR2104 may have a beneficial impact on inflammatory responses and microglial cell migration involved in the pathogenesis of various neurodegenerative disorders.     

Vegetable waste as substrate and source of suitable microflora for bio-hydrogen production

Self-fermentation of cellulosic substrates to produce biohydrogen without inoculum addition nor pretreatments was investigated. Dark fermentation of two different substrates made of leaf-shaped vegetable refuses (V) and leaf-shaped vegetable refuses plus potato peels (VP), was taken in consideration. Batch experiments were carried out, under two mesophilic anaerobic conditions (28 and 37 °C), in order to isolate and to identify potential H₂-producing bacterial strains contained in the vegetable extracts. The effect of initial glucose concentration (at 1, 5 and 10 g/L) on fermentative H₂ production by the isolates was also evaluated.H₂ production from self-fermentation of both biomasses was found to be feasible, without methane evolution, showing the highest yield for V biomass at 28 °C (24 L/kg VS). The pH control of the culture medium proved to be a critical parameter. The isolates had sequence similarities ≥98% with already known strains, belonging to the family Enterobacteriaceae (γ-proteobacteria) and Streptococcaceae (Firmicutes). Four genera found in the samples, namely Pectobacterium, Raoultella, Rahnella and Lactococcus have not been previously described for H₂ production from glucose. The isolates showed higher yield (1.6–2.2 mol H₂/mol glucose_added) at low glucose concentration (1 g/L), while the maximum H₂ production ranged from 410 to 1016 mL/L and was obtained at a substrate concentration of 10 g/L. The results suggested that vegetable waste can be effectively used as both, substrate and source of suitable microflora for bio-hydrogen production.     

淀粉黏度性质研究最新进展

综述淀粉黏度的测定方法,对比目前常用的布拉班德黏度计(BV)法和快速黏度分析仪(RVA)法.总结影响淀粉黏度的各种因素(包括基因、生长条件、直链淀粉含量、支链淀粉结构、淀粉颗粒大小、处理方法及植物和食品中的其它成分)以及改变淀粉黏度性质的各类变性方法,并对今后淀粉黏度性质的研究进行展望.     

一种基于IXP2400的多维包分类引擎设计

包分类在基于策略的路由、Qos和防火墙等网络应用中至关重要,在网络中提供这些区分服务的关键机制是数据包分类功能。网络处理器是一种优化处理网络分组数据的可编程集成电路,其高并行性和可编程特点适合用来实现包分类等计算密集型任务。论文根据BV包分类算法的并行特点,提出了一种基于IXP2400的包分类引擎机制,为高速网络环境下实现网络数据的线速处理提供了借鉴价值。     

食物蛋白质营养质量化学评分法的改进之二——用全氨基酸或理论纯蛋白计算氨基酸分及化学生物价

本文分析了氨基酸分测算过程中误差的主要来源,提出了直接利用氨基酸分析仪测定出的食物中各氨基酸组成和含量来计算食物蛋白的氨基酸分及其化学生物价的方法。利用该方法,可使食物蛋白质营养质量的化学评分值更接近生理评分值——生物学价值;使化学评分法更为简便,准确和可靠。具有较高的理论价值和实用价值。     

A/O~2工艺在天能公司焦化废水处理中的应用

介绍了盘县天能公司焦化废水生物处理系统的开工调试、污泥培养驯化及各池指标的控制方法,提出了工艺方面存在的问题和工艺改进措施,并总结了生产操作中应注意的问题。A/O2工艺利用好氧和兼厌氧微生物对高浓度焦化废水处理后,水质各项指标为:酚≤0.5 mg/L、氰≤0.5 mg/L、氨氮≤40 mg/L、COD≤150mg/L、油≤0.5 mg/L,COD的去除率在85%以上,氨氮、酚、氰、油等的去除率达到95%以上,实现了所有污水集中处理,焦化废水零排放的目标。