通用串行总线收发器MIC2550及其应用

MIC2550是Micrel公司推出的新型单片通用串行总线收发器集成电路。该芯片符合通用串行总线（USB）规范V1.1标准,支持全速12Mb/s和低速1.5Mb/s操作;MIC2550的功耗特别低,并可在低于2.5V的电压下正常工作。文章介绍了MIC2550的基本特点、引脚功能、主要参数和典型应用电路。     

Synthesis,characterization, and biological activity of some complex combinations of nickel with α-ketoglutaric acid and 1-(o-tolyl)biguanide

The four divalent nickel complexes having α-ketoglutaric acid (H₂A) and 1-(o-tolyl)biguanide (TB) ligands have been synthesized, characterized, and tested for antibacterial and antitumor activity.The proposed formulas for these complexes are [Ni(TB)(HA)(H₂O)₂]Cl (C1), [Ni(TB)(HA)(H₂O)₂]Br (C2), [Ni(TB)(HA)]NO₃·H₂O (C3), and [Ni(TB)(HA)]CH₃COO (C4), where HA represents deprotonated H₂A.For the four complexes and for the ligands used in the synthesis, the antibacterial activity against Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853 and antitumor activity in HeLa tumor cells were tested. A moderate cytotoxic effect of C3 and C4 complexes has been observed on the development and metabolic activity of HeLa cells, whereas C1 and C2 ligands have a very low effect on them.The synthesized complexes (obtained) inhibit adherence to the inert substrate of bacterial strains S. aureus and P. aeruginosa; therefore, they may be candidates for (potential) therapeutic applications.     

基于MIC总线的军用车载网络故障诊断与测试方法研究

针对军用车辆综合电子系统故障机理复杂这一问题,文章构建了MIC网络主动和被动相结合的在线数据测试方法,从消息传输的完整性和实时性角度系统地提出了网络性能测试及分层故障定位模型,运用在线数据解析技术和实时数据库管理技术进行网络测试设备的开发。通过某型车辆的实车测试,证明了上述测试方法和测试模型的可行性和有效性。     

Strained single-crystal GOI (Ge on Insulator) arrays by rapid-melting growth from Si (1 1 1) micro-seeds

Liquid-phase epitaxial growth of Ge islands on insulator (GOI) using Ni-imprint-induced Si (1 1 1) micro-crystal seeds (∼1 μm?) is proposed. As a result, single-crystalline GOI (1 1 1) structures with large area (∼10 μm?) are realized. The transmission electron microscopy observations reveal no dislocation or stacking fault in the laterally grown regions. Moreover, the Raman measurements show that the tensile strain (∼0.2%) which enhances the carrier mobility is induced in the growth regions. This new method can be employed to realize the multi-functional SiGe large scale integrated circuits.     

A Compendium of the Most Promising Synthesized Organic Compounds against Several Fusarium oxysporum Species: Synthesis,Antifungal Activity,and Perspectives

Vascular wilt caused by F. oxysporum (FOX) is one of the main limitations of producing several agricultural products worldwide, causing economic losses between 40% and 100%. Various methods have been developed to control this phytopathogen, such as the cultural, biological, and chemical controls, the latter being the most widely used in the agricultural sector. The treatment of this fungus through systemic fungicides, although practical, brings problems because the agrochemical agents used have shown mutagenic effects on the fungus, increasing the pathogen’s resistance. The design and the synthesis of novel synthetic antifungal agents used against FOX have been broadly studied in recent years. This review article presents a compendium of the synthetic methodologies during the last ten years as promissory, which can be used to afford novel and potential agrochemical agents. The revision is addressed from the structural core of the most active synthetic compounds against FOX. The synthetic methodologies implemented strategies based on cyclo condensation reactions, radical cyclization, electrocyclic closures, and carbon–carbon couplings by metal–organic catalysis. This revision contributes significantly to the organic chemistry, supplying novel alternatives for the use of more effective agrochemical agents against F. oxysporum.     

Design,synthesis and antimicrobial evaluation of thioglycosides of a novel class of 2-mercaptonicotinonitriles

A new class of thioglycosides comprising a diazenyl pyridine moiety was assembled from the regioselective reaction of the acetylated α-glycopyranosyl bromide with hitherto unreported 2-mercaptonicotinonitriles. Moreover, the deacetylation of S-glycoside derivatives utilizing of methanolic ammonia solution afforded the free hydroxy thioglycosides in quantitative yields. The identity of the newly obtained derivatives has been achieved via spectroscopic and elemental analyses. All of the newly synthesized derivatives exhibited significant antimicrobial activity towards certain selected microorganisms (bacteria and fungi). Generally, S-glycoside derivatives demonstrated outstanding antibacterial and antifungal activities. Amongst them, the acetylated derivatives showed the most distinguished antifungal and antibacterial activities with a promising minimum inhibitory concentration (MIC) values in comparison with the approved drugs; Amphotericin B and Cefotaxime.     

Synthesis and antimicrobial screening of 1,3,4-oxadiazole and clubbed thiophene derivatives

In the present study, a novel series of 2-{5-[4-(1-aza-2-(2-thienyl)vinyl)phenyl](1,3,4-oxadiazol-2-ylthio)}-N-arylacetamides (IV)_1–12 were synthesized and tested for their antimicrobial activity. Newly synthesized compounds were screened for their antibacterial and antifungal activities on Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Staphylococcus pyogenes, Candida albicans, Aspergillus niger and Aspergillus clavatus. The chemical structures of newly synthesized compounds were elicited by IR, ¹H NMR, ¹³C NMR and mass spectral data. The synthesized bio-active compounds exhibited excellent to moderate antimicrobial activity. Compounds (IV)₅, (IV)₆ and (IV)₇ possess excellent antibacterial activity whereas compounds (IV)₆, (IV)₉ and (IV)₁₁ possess excellent antifungal activity.     

InGaP/GaAs HBT X波段混合集成功率合成放大器的研制

研制了面向X波段应用的InGaP/GaAs HBT混合集成功率合成放大器模块.电路采用一种新颖的具有片上RC稳定网络的InGaP/GaAs HBT功率管作为功率合成单元以提高电路的稳定性,并采用紧凑的微带线并联匹配网络进行功率分配和合成.在8.1GHz,偏置为Vcc=7V,Ic=230mA的AB类工作条件下,连续波最大输出功率为28.9dBm,功率合成效率达到80%.     

高压高速远程通信用DC-DC控制器MIC9130及其应用电路

MIC9130是MICREL公司生产的高压，高速，电流型通信用DC－DC开关电源控制器，它可以将48V的电信电压转换成3．3V或5V逻辑电平，而且效率很高。MIC9130可广泛用于通信电源，线卡，ISDN网络终端，微微网基站以及其它小于30W的小功率DC－DC变换等领域，文中介绍了MIC9130的主要特点，引脚引功能和结构原理，给出了它的典型应用电路。     

Synthesis and antimicrobial characterization of novel l-lysine gemini surfactants pended with reactive groups

A series of novel quaternary ammonium gemini surfactants of l-lysine containing ester group were synthesized with high yield rate. The antibacterial and antifungal activities of these gemini surfactants were evaluated by quantifying the minimal inhibitory concentration (MIC). The results indicated that the quaternary ammonium gemini surfactants exhibited improved activity against a broad spectrum of Gram-positive and Gram-negative bacteria as well as fungi. The pended ester group provides a reactive site for incorporating the surfactant into polymers, thus leading to the polymers with high antimicrobial efficiency.