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Magnetocaloric properties of the Gd_5Si_(2.05-x)Ge_(1.95-x)Mn_(2x) compounds

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Journal of Rare Earths 2010年第3期28卷 477-480页

作者： E.Yüzüak I.Dincer Y.Elerman Ankara University Faculty of EngineeringDepartment of Engineering Physics

The influence of the manganese-alloying on the structure and magnetocaloric properties of the Gd5Si2.05Ge1.95 compound was studied by X-ray powder diffraction and magnetization *** Gd5Si2.05-xGe1.95-xMn2x(2x=0,0.03 and 0.08) compounds crystallized in the Gd5Si2Ge2-type monoclinic *** all X-ray powder diffraction patterns,a minor hexagonal Gd5Si3 phase was observed as a second *** increasing Mn content,the unit cell volume *** the compounds with x=0,0.03 and 0.08,the fi...

关键词： magnetic materials heat treatments intermetallics rare earths

Healing property of the Piper betel phenol, allylpyrocatechol against indomethacin-induced stomach ulceration and mechanism of action

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World Journal of Gastroenterology 2007年第27期13卷 3705-3713页

作者： S Bhattacharya D Banerjee ak Bauri S Chattopadhyay SK Bandyopadhyay Department of Biochemistry Dr. B.C. Roy Post Graduate Institute of Basic Medical Sciences IPGME&R 244B Acharya Jagadish Chandra Bose Road Kolkata-700020 India Bio-Organic Division Bhabha Atomic Research Centre Mumbai-400085 India

AIM：To evaluate the protective activity of allylpyrocatechol （APC）, the major antioxidant constituent of Piper betel, against the indomethacin-induced stomach ulceration in the rat model and correlates with its antioxidative and mucin protecting properties.METHODS： Male Sprague-Dawley rats were divided into five groups. Normal control rats （group Ⅰ ） were given the vehicle oral dose of gum acacia in distilled water （1 mL per rat）; ulcerated control and treated rats （groups Ⅱ-V） were given a single dose of indomethacin （30 mg/kg body wt.）; group Ⅱ rats were sacrificed 4 h after indomethacin administration; groups Ⅲ-Ⅴ rats were given the vehicle （1 mL per rat） or APC （2 mg/kg body wt.） or misoprostol （1.43 μg/kg body wt.） once daily by oral intubation for 7 d starting from 4 h after the indomethacin administration. After 7 d, the stomach tissues were excised for histological examination and biochemical analysis. RESULTS： Treatment with APC （2 mg/kg body wt per day） and misoprostol （1.43 μg/kg body wt per day） for 7 d could effectively heal the stomach ulceration as revealed from the ulcer index and histopathological studies. Compared to the zero day ulcerated group, treatment with APC and misoprostol reduced the ulcer index by 93.4% and 85.4% respectively （P 〈 0.05）. Both APC and misoprostol accelerated ulcer healing observed in natural recovery （P 〈 0.05）, their respective healing capacities not being significantly different. The healing capacities of APC and misoprostol could be attributed to their antioxidant activity as well as the ability to enhance the rnucin content of the gastric tissues. Compared to the ulcerated untreated rats, those treated with APC and rnisoprostol showed near normal MDA levels, while the protein levels were 86% and 78% of the normal value respectively （P 〈 0.05）. Likewise, both APC and rnisoprostol increased the SOD, catalase, and rnucin levels significantly （P 〈 0.05）, the effect of APC being better. CONCLUSION： APC can protect ind

关键词： Allylpyrocatechol Antioxidant Histopathology Indornethacin Mucin Piper betel Stomach ulcer

Mechanical Properties of Reactive Powder Concretes Produced Using Pumice Powder

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Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 353-360页

作者： Abdurrezzak BakIS Ercan ISIK Alev ak?ll? EL Mustafa üLKER Bitlis Eren University Faculty of Engineering and Architecture Department of Civil Engineering Bitlis Eren University Vocational School of Technical Sciences

We examined the applicability of the pumice aggregate on the concrete formed by considering the reactive powder concrete mixture ratios, for the rigid superstructure concrete road pavement and building construction. The natural pumice aggregate in fibrous and non-fibrous concrete samples was used in the production of concrete by fracturing in 0.1-0.6 mm dimensions in rotor mill. The concreted formed in this way is named after the pumice powder concrete(PPC). The PPC samples produced were taken 7 days as 20 ℃ standard water cure, 28 days as 20 ℃ standard cure and 9 different types of combined cures. The combined cures were applied different temperatures in different durations. PPC samples were subjected to some pressure and flexural tests at the end of the standard water and combined cures. The highest compressive and flexural strengths of PPC samples were obtained after the combined cures: 3 days in 20 ℃ as standard water curing + 2 days in 180 ℃ in drying-oven. The highest compressive strength of PPC samples without any fiber was found to be 47.27 MPa, as for the highest flexural strength, it is found to be 5.23 MPa, in the end of the study. The highest compressive strength of fibrous PPC samples was 51.12 MPa, while flexural strength was 6.57 MPa.

关键词： reactive powder concrete (RPC) pumice powder concrete (PPC) combined cure compressive strength flexural strength

Bioactivity guided isolation of mosquito larvicide from Piper longum

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Asian Pacific Journal of Tropical Medicine 2011年第2期4卷 112-116页

作者： Madhu.S Kumar Vijayan VA Shaukath ak Vector Biology Research Lab Department of Studies in ZoologyUniversity of MysoreManasagangotriMysore 570 006KarnatakaIndia Department of Studies in Zoology University of MysoreManasagangotriMysore 570 006KarnatakaIndia Department of Chemistry Yuvaraja's CollegeUniversity of MysoreMysore-05India

Objective:To isolate the larvicidal component from the fruits of Piper longum（***） against the filariasis vector,Culex quinquefasciatus（***）.Methods:Pulverized fruits of *** were subjected to soxhlet extraction using series of organic solvents of increasing *** the solvent extracts were verified for their larvicidal efficacy against 4th instar larvae of *** employing standard WHO *** fractionation through column chromatography lead to the isolation of a bioactive amide, pipyahyine from the petroleum ether ***:Petroleum ether extract was found to be the most active fraction among all the extracts tested with LC50 and LC90 being 1.03 and 2.04 ppm ***,pipyahyine,an isolated component of the same fraction was found to be even more effective than the parent extract in terms of LC50 being 0.58 and 1.88 ppm respectively. Conclusions:From the results,it is evident that *** can be considered as a powerful arsenal for the control of mosquito population.

关键词： Piper longum Bioassay Pipyahyine Culex quinquefasciatus Filariasis Larvicide

Differences in individual susceptibility affect the development of trigeminal neuralgia

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Neural Regeneration Research 2013年第14期8卷 1337-1342页

作者： Yusuf Kurtulus Duransoy Mesut Mete Emrah akay Mehmet Seluki Department of Neurosurgery Celal Bayar University School of Medicine Clinic of Neurosurgery Anamur State Hospital

Trigeminal neuralgia is a syndrome due to dysfunctional hyperactivity of the trigeminal nerve, and is characterized by a sudden, usually unilateral, recurrent lancinating pain arising from one or more divisions of the nerve. The most accepted pathogenetic mechanism for trigeminal neuralgia is compression of the nerve at its dorsal root entry zone or in its distal course. In this paper, we report four cases with trigeminal neuralgia due to an unknown mechanism after an intracranial intervention The onset of trigeminal neuralgia after surgical interventions that are unrelated to the trigeminal nerve suggests that in patients with greater individual susceptibility, nerve contact with the vascular structure due to postoperative pressure and changes in cerebrospinal fluid flow may cause the onset of pain.

关键词： neural regeneration peripheral nerve injury asymptomatic vascular compression of the cranialnerves cranial nerves dorsal root entry zone dorsal root exit zone etiology hyperactivedysfunction syndrome individual susceptibility risk factors trigeminal neuralgia neuroregeneration

Expression of β2-integrin on leukocytes in liver cirrhosis

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World Journal of Gastroenterology 2006年第38期12卷 6193-6197页

作者： Anatol Panasiuk Janusz ■ak Elzbieta Maciorkowska Bozena Panasiuk Danuta Prokopowicz Department of Infectious Diseases Medical University of Bialystok Poland Department of Pediatrics Diagnostics Medical University of Bialystok Poland Department of Pediatric Nursing Medical University of Bialystok Poland

AIM： To analyze β2-integrin expression on blood leukocytes in liver drrhosis.METHODS： In 40 patients with liver cirrhosis and 20 healthy individuals, the evaluation of expression of CD11a （LFA-1α）, CD11b （Mac-1α）, CD11c （αX） and CD49d （VLA-4α） on peripheral blood leukocytes was performed using flow cytometry. The analysis was carried out in groups of patients divided into B and C according to Child-Pugh＇s classification. RESULTS： An increased CDlla, CD11b, CD11c and CD49d integrin expression was observed on peripheral blood leukocytes in liver cirrhosis. The integrin levels were elevated as the advancement of liver failure progressed. The highest expression of integrins occurred predominantly on monocytes. A slight expression of VLA-4 was found on lymphocytes and granulocytes and it increased together with liver failure. A positive correlation was noted between median intensity of fluorescence （MIF） expression on polymorphonuclear cells of CD11a and CD11c and CD49d （r = 0.42, P 〈 0.01; r = 053, P 〈 0.01, respectively） in liver cirrhosis stage C. However, no correlation was observed between integrin expression on leukocytes. The concentrations of sICAM-1, sVCAM-1, and TNFα, were significantly elevated in liver cirrhosis. CONCLUSION： β2-integrin expression on leukocytes increases in liver cirrhosis decornpensated as the stage of liver failure increases, which is a result of permanent activation of leukooytes circulating through the inflamed liver environment.β2-integrin expression on circulating leukocytes can intensify liver cirrhosis,

关键词： β2-integrin Liver cirrhosis Flow cytometry Leukocytes

Petrogenesis of the ükapili Granitoid and its Mafic Enclaves in Elmal Area (Nigde, Central Anatolia, Turkey)

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 738-748页

作者： Hüseyin KURT Kerim KOak Kürsad ASAN Mustafa KARakAS Department of Geological Engineering Seluk University Central Anatolia Directorate of Mineral Research and Exploration

The Late Cretaceous Uckapth Granitoid including mafic microgranular enclaves intruded into metapelitic and metabasic rocks, and overlain unconformably by Neogene ignimbrites in the Ni^de area of Turkey. It is mostly granite and minor granodiorite in composition, whereas its enclaves are dominantly gabbro with a few diorites in composition. The Uckapdl Granitoid is composed mainly of quartz, K-feldspar, plagioclase, biotite, muscovite and minor amphibole while its enclaves contain mostly plagioclase, amphibole, minor pyroxene and biotite. The Uckapth Granitoid has calcalkaline and peraluminous （AJCNK= 1.0-1.3） geochemical characteristics. It is characterized by high LILE/HFSE and LREE/HREE ratios （（La/Lu）N 3-33）, and has negative Ba, Ta, Nb and Eu anomalies, resembling those of comsion granitoids. The {）fkaplh Granitoid has relatively high STSr/S6Sr0） ratios （0.711189--0.716061） and low eNd（t） values （-5.13 to -7.13）, confirming crustal melting. In contrast, the enclaves are tholeiitic and metaluminous, and slightly enriched in LILEs （K, Rb） and Th, and have negative Ta, Nb and Ti anomalies; propose that they were derived from a subduction-modified mantle source. Based on mineral and whole rock chemistry data, the Uckapth granitoid is H-（hybrid） type, post-collision granitoid developed by mixing/mingllng processes between crustal melts and mantle-derived mafic magmas.

关键词： H-type granitoid mafic enclave geochemistry Central Anatolia Turkey

Effect of Different Bleaching Applications on the Surface Properties and Staining Susceptibility of Dental Composites

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Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 677-683页

作者： Pinlar Gul Osman Tolga Harorli Nilgün ak Mustafa Gündogdu Department of Restorative Dentistry Faculty of DentistryAtaturk University25240-ErzurumTurkey Department of Restorative Dentistry Faculty of DentistryAkdeniz University07058-AntalyaTurkey Department of Prosthetic Dentistry Faculty of Dentistry Ataturk University25240-ErzurumTurkey

The aim of this study was to investigate the effects of two bleaching systems on micro hardness, surface roughness and color stability of two novel dental composites. Ormocer based restorative Admira and nano-filled composite Clearfil Majesty Esthetic were bleached with 10% carbamide peroxide （Opalescence PF） or 35% hydrogen peroxide （Beyond Max 5） and subsequently immersed in four different staining solutions （coffee, tea, red wine, and cola）. Distilled water was used as a control. Color measurements were performed with a spectrophotometer. Vickers micro hardness and roughness data were analyzed with two- way analysis of variance for repeated measures. The analysis of variance was used to compare the color change values. Duncan＇s multiple comparison test was applied to compare the results （a = 5%）. AE~＂ values over 3.3 were considered clinically unacceptable. Micro hardness and surface roughness values of the tested composites were decreased significantly after bleaching applications. Red wine and tea storage caused perceptible discolorations in the composite resin materials after 30 days of 3-hour immersion. Home or office bleaching applications can affect the surface properties of resin composites and accelerate the staining process.

关键词： composite resin bleaching surface roughness micro hardness discoloration

Diversity and endophytic fungal composition in Ananas comosus(L.)*** queen cultivar isolated from three different growing conditions

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Studies in Fungi 2020年第1期5卷 310-319页

作者： Bhattacharya S Debnath S Saha ak Department of Botany M.B.B.CollegeAgartala-799004TripuraIndia Mycology and Plant Pathology Laboratory Department of BotanyTripura UniversitySuryamaninagar-799022TripuraIndia

Present study deals with the isolation of endophytic fungi from leaf and root explants of Ananus comosus var queen from three growing conditions ***,cultivated as monoculture and cultivated as mixed cropping system with rubber plants.A total of twenty-nine endophytic fungal strains along with two nonsporulating forms were isolated from the host plant from three experimental *** maximum numbers of fungal strains were found belong to family Aspergillaceae and order *** highest rates of colonization and isolation(p<0.05)of endophytic fungi have been reported in wild foliar explants(95.53±0.53)and monoculture(1.02±0.01),*** highest relative frequency was observed among isolated fungal strains in the case of Lasiodiplodia theobromae isolated from the leaf and root of wild(26.22%)and monoculture(29.62%)*** *** and Aspergillus flavus,isolated from the leaf and roots of wild(21.66%)and monoculture(14.66%)explants showed the highest colonization *** findings showed that the distribution of fungal endophytes and their relative frequency in host plants vary in three different growing conditions.

关键词： Colonization frequency Fungal endophytes Mixed cropping Monoculture Pineapple