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深海挖“土豆”

小哥白尼（趣味科学） 2024年第5期 34-35页

作者：求索 aker Solutions(图) 不详

大海深处有什么?是伸手不见五指的漆黑,还是各种奇形怪状的深海生物?我猜,你想了一圈也不会想到,在海底还有许多野生的“土豆”!

关键词：深海生物土豆深海

Assessing the effect of different natural dissolved organic matters on the cytotoxicity of titanium dioxide nanoparticles with bacteria

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Journal of Environmental Sciences 2016年第10期28卷 230-236页

作者： Xiaojia He Donee' McAlliser Winfred G. aker Huey-min Hwang Department of Biology Jackson State University Jackson MS 39217 USA Environmental Science Ph.D. Program Jackson State University Jackson MS 39217 USA

Titanium dioxide nanoparticles （TiO2 NPs） are among the most widely manufactured nanomaterials on a global scale. However, prudent and vigilant surveillance, incumbent upon the scientific community with the advent of new technologies, has revealed potentially undesirable effects of TiO2 NPs on biological systems and the natural environment during their application and discharge. Such effects are likely best evaluated by first assessing the fate of the TiO2 NPs in natural environments. In this study, the effects of terrestrial humic acid （HA） and tannic acid （TA）, two major members of the collective： dissolved organic matter （DOM）, on the cytotoxicity of TiO2 NPs to Escherichia coli were investigated in the presence and absence of natural sunlight. Qualitative （transmission electron microscopy （TEM）） and quantitative （LCso） analyses were employed in this study. In addition, the production of reactive oxygen species （ROS） in the form of .OH was further assessed-as HA or TA increased the production of ROS decreased. The inhibition of bacterial viability in the light treatment groups, with respective treatment organics at concentrations of 10 ppm, was less in TA than in terrestrial HA. SAS was used to analyze the treatment effect of individual factors of light irradiation, DOM, and concentration of TiO2 NPs.

关键词： TiO2 nanoparticlesHumic acid Tannic acid CytotoxicityROS

Assessing the effects of surface-bound humic acid on the phototoxicity of anatase and rutile TiO_2 nanoparticles in vitro

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Journal of Environmental Sciences 2016年第4期28卷 50-60页

作者： Xiaojia He Sabrieon Sanders Winfred G.aker Yunfeng Lin Jessica Douglas Huey-min Hwang Department of Biology Jackson State University Department of Biological Sciences Alcorn State University Environmental Science Ph.D.Program Jackson State University Department of Chemistry and Biochemistry Jackson State University School of Polymers and High Performance Materials The University of Southern Mississippi

In this study,the cytotoxicity of two different crystal phases of TiO2 nanoparticles,with surface modification by humic acid（HA）,to Escherichia coli,was *** physicochemical properties of TiO2 nanoparticles were thoroughly *** different initial concentrations,namely 50,100,and 200 ppm,of HA were used for synthesis of HA coated TiO2 nanoparticles（denoted as A/RHA50,A/RHA100,and A/RHA200,respectively）.Results indicate that rutile（LC50（concentration that causes 50%mortality compared the control group）=6.5）was more toxic than anatase（LC50=278.8）under simulated sunlight（SSL）irradiation,possibly due to an extremely narrow band *** is noted that HA coating increased the toxicity of anatase,but decreased that of ***,AHA50 and RHA50had the biggest differences compared to uncoated anatase and rutile with LC50of 201.9 and21.6,*** then investigated the formation of reactive oxygen species（ROS）by TiO2 nanoparticles in terms of hydroxyl radicals（OH）and superoxide anions（O2^-）.Data suggested that O2^- was the main ROS that accounted for the higher toxicity of rutile upon SSL *** also observed that HA coating decreased the generation of OH and O2^- on rutile,but increased O2^- formation on *** from TEM analysis also indicated that HA coated rutile tended to be attached to the surface of *** more than anatase.

关键词： TiO2nanoparticles Escherichia coli Humic acid Crystallinity Surface coating

Microstructural,Mechanical,Electrical,and Thermal Properties of the Bi-Sn-Ag Ternary Eutectic Alloy

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 147-154页

作者： KAYA Hasan ENGÍN Sevda aker Aynur BüYüK Ugur ÇADIRLI Emin Faculty of Education Department of science EducationErciyes UniversityKayseriTurkey Faculty of Thech Department of Energy Systems EngineeringDumluplnar Univ.KütahyaTurkey Faculty of Education Department of Computer and instructional TechnologiesSiirt UniversitySürtTurkey Faculty of Arts and Sciences Department of PhysicsOmer Halisdemir UniversityNigdeTurkey

The development of lead-free solders has emerged as one of the key issues in the electronics packaging ***-Sn-Ag eutectic alloy has been considered as one of the lead-free solder materials that can replace the toxic Pb-Sn eutectic solder without increasing soldering *** investigated the effects of temperature gradient and growth rate on the mechanical,electrical and thermal properties of the BiSn-Ag ternary eutectic ***-47 wt%Sn-0.68 wt%Ag alloy was directionally solidified upward with different temperature gradients（G=2.33-5.66 K/mm） at a constant growth rate（V=13.25 μm/s） and with different growth rates（V=6.55-132.83 μm/s） at a constant temperature gradient（G=2.33 K/mm） in the growth *** microstructures（λ）,microhardness（HV）,tensile stress（σ）,electrical resistivity（ρ）,and thermal properties（△H,Cp,Tm） were measured on directionally solidified *** dependency of the λ,HV,σ,and ρ on G and V was *** to the experimental results,X values decrease with increasing G and V,but HV,λ,and ρ values increase with increasing G and *** of electrical resistivity（ρ） for cast samples with the temperature in the range of 300-400 K were also measured by using a standard dc four-point probe *** enthalpy of fusion（△H） and specific heat（Cp） for the same alloy was also determined by means of differential scanning calorimeter（DSC） from heating trace during the transformation from eutectic liquid to eutectic solid.

关键词： solidification microhardness tensile stress electrical resistivity enthalpy

Total Synthesis of (±)-Nocardione A and (±)-Nocardione B, Two Cdc25B Tyrosine Phosphatase Inhibitors

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Chinese Chemical Letters 2001年第10期12卷 883-886页

作者： Hai YANG Wei LU Jian Xiong BAO Haji aker AISA Jun Chao CAI Shanghai Institute of Materia Medica SIBSChinese Academy of SciencesShanghai 200031 Xinjiang Institute of Chemistry Chinese Academy of SciencesUrumqi 830011

Two new naphthoquinones, nocardione A and B isolated from strain P-A0248, were synthesized from naphtho[1,2-b]furan 1. The furan 1 was prepared from 5-methoxyl-1-naphthol.

关键词： Synthesis nocardione A nocardione B.

Anti-inflammatory efficiency of levobupivacaine in an experimental colitis model

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World Journal of Gastroenterology 2010年第20期16卷 2537-2541页

作者： Ugur Duman Aysun Yilmazlar Ersin Ozturk Sibel aker Emre Sarandol Tuncay Yilmazlar Department of General Surgery Uludag University School of Medicine16069 BursaTurkey Department of Anesthesiology and Reanimation Uludag University School of Medicine16069 BursaTurkey Department of Pathology Uludag University School of Medicine16069 BursaTurkey Department of Biochemistry Uludag University School of Medicine16069 BursaTurkey

AIM:To investigate the efficiency of levobupivacaine in treating experimentally induced colitis in ***:Colitis was induced by trinitrobenzene sulfonic acid and ethanol in 30 rats under general anesthesia,and 10 rats were used as a sham *** to induction of colitis,rats were divided into three groups;budesonide group received 0.1 mg/kg budesonide,levobupivacaine group received 10 mg/kg levobupivacaine and saline group received 1 mL saline solution via rectal route for 7 *** the sham group,only routine rectal catheterization was performed without use of any *** the end of 7 d,laparotomy and total colectomy were performed for histopathological ex-amination in all rats and blood samples were drawn for measurement of tumor necrosis factor(TNF)-αand interleukin(IL)-6 following cardiac *** and microscopic evaluations of the specimens were performed by a pathologist blinded to group assignment of the ***:Weight loss(P=0.016)and macroscopic examination scores(P=0.001)were significantly higher in saline group than *** scoring was comparable between all colitis groups(P=0.350).There was no significant difference in TNF-αlevels and IL-6 levels(P=0.150).CONCLUSION:The significant improvement in macroscopic scores suggests that levobupivacaine may have topical anti-inflammatory effects in an experimental colitis model;however,this finding was not supported by microscopic findings.

关键词： Trinitrobenzene sulfonic acid Colitis Levobupivacaine Budesonide

Tuberculous Peritonitis Mimicking Malignancy during Adalimumab Therapy in a Patient with Rheumatoid Arthritis

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Journal of Tuberculosis Research 2015年第3期3卷 72-76页

作者： Refik Demirtunc Ugur Ozensoy Kadir Kayatas Fügen Vardar aker Department of Internal Medicine Haydarpasa Numune Training and Research HospitalIstanbulTurkey Department of Pathology Haydarpasa Numune Training and Research HospitalIstanbulTurkey

We present a case of tuberculous peritonitis in a 46-year-old woman with rheumatoid arthritis treated with adalimumab, and we review the association between anti-tumour necrosis factor therapy and tuberculosis. This case illustrates that tuberculosis can develop with atypical clinic and uncertain laboratory findings and may mimic malignancies during adalimumab therapy.

关键词： Adalimumab Rheumatoid Arthritis Tuberculous Peritonitis

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研究结核病需要做的工作

国外防痨与肺部疾病 1995年第4期 14-16页

作者： prab.,R 宋礼章马德拉斯结核病研究中心

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调制后的工艺对烟叶香气和烟气香味的改进

国外烟草 1991年第2期 26-27页

作者： prab.,SR 张务水