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Selective microwave absorption in Nd3+ substituted barium ferrite composites

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Journal of Rare Earths 2019年第12期37卷 1320-1325页

作者： Wahyu Widanarto siti Khaeriyah Sib Krishna Ghoshal Candra Kurniawan Mukhtar Effendi Wahyu Tri Cahyanto Department of Physics FMIPAUniversitas JenderalSoedirmanJL dr.Soepamo 61Purwokerto53123Indonesia Department of Physicsand Laser Centre AMORGFaculty of ScienceUniversiti Teknologi MalaysiaJohor BahruSkudai81310Malaysia Research Center for Physics Indonesian Institute of Sciences(LIPI)Puspiptek Office AreaSouth TangerangBanten15314Indonesia

Microwave(MW)frequency based wireless communications and electronic devices became prospective due to several *** meet this need,a series of neodymium ions(Nd3+)substituted barium ferrite composites with composition(20)BaO:(80-x)Fe2 O3:(x)Nd2 O3(0≤x≤3 mol%)was prepared at1100℃using solid-state reaction *** evaluated the effect of various Nd3+ions contents on the surface morphology,structure,and magnetic properties of the as-synthesized barium ferrite ***,microwave reflection loss,complex permittivity and permeability were determined using the transmission/reflection line method in the X-band(8-12 Ghz).SEM image of the composites shows that the surface morphology consists of rough and porous *** patterns of the un-doped composites reveal the existence of BaFe12O19(hexagonal)and Fe21.333O32(tetragonal)crystalline ***,a new hexagonal crystalline phase of Ba6 Nd2 Fe4 O15 with the crystallite sizes between 15 and 67 nm is observed due to Nd3+ions substitution in the *** saturation magnetization of the composite containing 2 mol%of Nd3+does not exhibit any significant alteration compared to the one devoid of Nd3+.The complex relative permitivity and permeability of the achieved composites enriched in Ba6 Nd2 Fe4 O15 and BaFe2 O4 phases disclose significant MW frequency *** composites also display selective MW absorption in the X-band which could be useful for diverse applications.

关键词： Neodymium doping Barium ferrite composites Magnetic properties Porosity MW reflection loss Rare earths

The effect of curcumin as an antioxidant on cochlea fibroblasts in ototoxic rat models

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Journal of Chinese Pharmaceutical Sciences 2018年第12期27卷 847-854页

作者： Tengku siti hajar haryuna Agustinus hamonangan Winston Purba Farhat Farhat Soehartono Taat Putra Department of Otorhinolaryngology Faculty of MedicineUniversitas Sumatera Utara Pathobiology Division Department of Anatomic Pathology Faculty of Medicine Universitas Airlangga

Aminoglycosides(e.g. Gentamicin) are ototoxic drugs and widely prescribed due to their effective antimicrobial actions and affordable prices. This study focused on determining protective effect of curcumin against the damage caused by aminoglycosides. We aimed to demonstrate the potential of curcumin as an antioxidant to increase the expressions of superoxide dismutase(SOD) in fibroblasts of cochlea lateral wall in ototoxic rat models. The experiment was conducted with randomized post test-only control group design by using 32 male Rattusnorvegicus adults which received a combination of gentamicin and curcumin with different durations and doses. Then, the rats underwent terminations and immunohistochemical assay to determine the expression of SOD. The rats receiving gentamicin injection showed significantly decreased expression of SOD(Phe administration of curcumin before and after the gentamicin injection showed significantly increased expression of SOD(Phowed that curcumin was an antioxidant against oxidative stress due to ototoxicity evidenced by the expression of SOD.

关键词： Curcumin Antioxidant Gentamicin Superoxide dismutase Preventive Rat Experimental

New generation Amberlite XAD resin for the removal of metal ions: A review

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Journal of Environmental Sciences 2015年第5期27卷 104-123页

作者： Akil Ahmad Jamal Akhter Siddique Mohammad Asaduddin Laskar Rajeev Kumar siti hamidah Mohd-Setapar Asma Khatoon Rayees Ahmad Shiekh Centre of Lipids Engineering & Applied Research (CLEAR) Faculty of Chemical Engineering Universiti Teknologi Malaysia Department of Materials Engineering and Chemistry Faculty of Civil Engineering Czech Technical University Department of Chemistry Jazan University Department of Environmental Sciences Faculty of Meteorology Environment and Arid Land Agriculture King Abdulaziz University Department of Chemistry Faculty of Science Taibah University

The direct determination of toxic metal ions, in environmental samples, is difficult because of the latter＇s presence in trace concentration in association with complex matrices, thereby leading to insufficient sensitivity and selectivity of the methods used. The simultaneous removal of the matrix and preconcentration of the metal ions, through solid phase extraction,serves as the promising solution. The mechanism involved in solid phase extraction（SPE）depends on the nature of the sorbent and analyte. Thus, SPE is carried out by means of adsorption, ion exchange, chelation, ion pair formation, and so forth. As polymeric supports, the commercially available Amberlite resins have been found very promising for designing chelating matrices due to its good physical and chemical properties such as porosity, high surface area,durability and purity. This review presents an overview of the various works done on the modification of Amberlite XAD resins with the objective of making it an efficient sorbent. The methods of modifications which are generally based on simple impregnation, sorption as chelates and chemical bonding have been discussed. The reported results, including the preconcentration limit, the detection limit, sorption capacity, preconcentration factors etc., have been reproduced.

关键词： Amberlite XAD Toxic metals Chelating resin Preconcentration Sorption capacity

Phyllosticta capitalensis,a widespread endophyte of plants

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Fungal Diversity 2013年第3期60卷 91-105页

作者： Saowanee Wikee Lorenzo Lombard Pedro W.Crous Chiharu Nakashima Keiichi Motohashi Ekachai Chukeatirote siti A.Alias Eric h.C.McKenzie Kevin D.hyde School of Science Mae Fah Luang UniversityChiangrai 57100Thailand Institute of Excellence in Fungal Research Mae Fah Luang UniversityChiangrai 57100Thailand CBS-KNAW Fungal Biodiversity Centre Uppsalalaan 83584 CT UtrechtThe Netherlands Microbiology Department of BiologyUtrecht UniversityPadualaan 83584 CH UtrechtThe Netherlands Laboratory of Phytopathology Wageningen University and Research Centre(WUR)Droevendaalsesteeg 16708 PB WageningenThe Netherlands Graduate School of Bioresources Mie UniversityKurima-machiya 1577TsuMie 514-8507Japan Electron Microscope Center Tokyo University of AgricultureSakuraoka 1-1-1SetagayaTokyo 156-8502Japan Institute Ocean and Earth Sciences Institute for Postgraduate StudiesUniversity MalayaKuala Lumpur 50603Malaysia Landcare Research Private Bag 92170Auckland Mail CentreAuckland 1142New Zealand

Phyllosticta capitalensis is an endophyte and weak plant pathogen with a worldwide distribution presently known from 70 plant *** study isolated *** from different host plants in northern Thailand,and determined their different life *** strains of *** were isolated as endophytes from 20 *** additional 30 strains of *** from other hosts and geographic locations were also obtained from established culture *** analysis using ITS,ACTand TEF gene data confirmed the identity of all *** tests with five strains of *** originating from different hosts were completed on their respective host *** all cases there was no infection of healthy leaves,indicating that this endophyte does not cause disease on healthy,unstressed host *** *** is often isolated as an endophyte has important implications in fungal biology and plant *** to its endophytic nature,*** commonly found associated with lesions of plants,and often incorrectly identified as a species of quarantine importance,which again has implications for trade in agricultural and forestry production.

关键词： Guignardia Leaf spot Morphology Molecular phylogeny Quarantine

Effects of Tualang honey in modulating nociceptive responses at the spinal cord in offspring of prenatally stressed rats

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Journal of Integrative Medicine 2019年第1期17卷 66-70页

作者： Che Badariah Abd Aziz siti Qusyasyiah Ahmad Suhaimi hidani hasim Asma hayati Ahmad Idris Long Rahimah Zakaria Department of Physiology School of Medical Sciences Health Campus Universiti Sains Malaysia School of health Sciences Health Campus Universiti Sains Malaysia

Objective: This study was done to determine whether Tualang honey could prevent the altered nociceptive behaviour, with its associated changes of oxidative stress markers and morphology of the spinal cord,among the offspring of prenatally stressed ***: Pregnant rats were divided into three groups: control, stress, and stress treated with Tualang honey. The stress and stress treated with Tualang honey groups were subjected to restraint stress from day 11 of pregnancy until delivery. Ten week old male offspring(n = 9 from each group) were given formalin injection and their nociceptive behaviours were recorded. After 2 h, the rats were sacrificed, and their spinal cords were removed to assess oxidative stress activity and morphology. Nociceptive behaviour was analysed using repeated measures analysis of variance(ANOVA), while the levels of oxidative stress parameters and number of Nissl-stained neurons were analysed using a one-way ***: This study demonstrated that prenatal stress was associated with increased nociceptive behaviour, changes in the oxidative stress parameters and morphology of the spinal cord of offspring exposed to prenatal stress; administration of Tualang honey reduced the alteration of these ***: This study provides a preliminary understanding of the beneficial effects of Tualang honey against the changes in oxidative stress and neuronal damage in the spinal cord of the offspring of prenatally stressed rats.

关键词： Prenatal stress Nociceptive responses Tualang honey Spinal cord

TOXICITY OF TWO hERBICIDES 2,4-D DIMEThYLAMINE AND BENSULFURON METhYL TO RICE FIELD ChIRONOMUS KIIENSIS (TOKUNAGA) (DIPTERA:ChIRONOMIDAE)

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湿地科学 2006年第4期4卷 241-246页

作者： Al-Shami S A Che Salmah M R siti Azizah M N Abu hassan A Azmi M School of Biological Sciences Universitiy Sains Malaysia 11800 Penang Malaysia Malaysian Agricultural Research and Development Institute Bertam 13200 Seberang Perai Malaysia

Fourth instar larvae of Chironomus kiiensis (Tokunaga) were exposed to various concentrations of two commonly used herbicides: 2,4 - D Dimethylamine and Bensulfuron methyl in the rice fields. The bioassay experiment was carried out in a rearing unit in the laboratory at a room temperature ((27 ±2) °C). A thin layer of sand sediments and tissue papers were provided as substrate in each unit. Each concentration of all herbicides was prepared in 250 mL distilled water. The experiment was performed in triplicate and 20 chironomid larvae were placed in each rearing unit. The larvae were fed with fish food (Sanyuichiban®) at 2 d intervals and all units were aerated by air pumps. The experiment was monitored every 24 h for mortality of C. kiiensis. The 2,4 - D Dimethylamine bioassay was carried out for 24 h while Bensulfuron methyl was run for 72 h. Dead larvae, pupae and living or dead adults were counted and removed daily. The LC50 of 2,4 - D Dimethylamine was 2 638 mg ai L-1, more than 2 000 times higher than the recommended dose of 0.753 mg ai L-1 used for controlling weeds in the rice field. Bensulfuron methyl was more toxic than the 2,4 - D Dimethylamine. The LC 50 of the Bensulfuron methyl was recorded at 1.29 mg ai L -1, and approximately was more 20 times than that of the recommended dose of 0.057 mg ai L-1. Bensulfuron methyl was found to be slow acting. The mortality of the larvae was only observed after 72 h. however, this herbicide interfered with the emergence of C. kiiensis to adults at and above the recommended dose used in the rice fields. Based on their LC50 values, this study showed that applying these herbicides in the rice fields at doses recommended by the manufacturers was safe for C. kiiensis and presumably to other living organisms in the water.

关键词： chironomidae Chironomus kiiensis herbicides 2,4-D Dimethylamine Bensulfuron methyl

Review on Zinc Oxide Nanoparticles: Antibacterial Activity and Toxicity Mechanism

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Nano-Micro Letters 2015年第3期7卷 219-242页

作者： Amna Sirelkhatim Shahrom Mahmud Azman Seeni Noor haida Mohamad Kaus Ling Chuo Ann siti Khadijah Mohd Bakhori habsah hasan Dasmawati Mohamad Nano-Optoelectronics Research and Technology Laboratory (N.O.R.Lab) School of Physics Universiti Sains Malaysia Advanced Medical and Dental Institute Cluster of Integrative Medicine Universiti Sains Malaysia School of Chemical Sciences Universiti Sains Malaysia Nano-Optoelectronics Research and Technology Laboratory(N.O.R.Lab) School of Physics Universiti Sains Malaysia Department of Medical Microbiology Parasitology and Immunology School of Medical Sciences Universiti Sains Malaysia School of Dental Sciences Universiti Sains Malaysia

Antibacterial activity of zinc oxide nanoparticles(Zn O-NPs) has received significant interest worldwide particularly by the implementation of nanotechnology to synthesize particles in the nanometer region. Many microorganisms exist in the range from hundreds of nanometers to tens of micrometers. Zn O-NPs exhibit attractive antibacterial properties due to increased specific surface area as the reduced particle size leading to enhanced particle surface reactivity. Zn O is a bio-safe material that possesses photo-oxidizing and photocatalysis impacts on chemical and biological species. This review covered Zn O-NPs antibacterial activity including testing methods, impact of UV illumination, Zn O particle properties(size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration. Particular emphasize was given to bactericidal and bacteriostatic mechanisms with focus on generation of reactive oxygen species(ROS) including hydrogen peroxide(h2O2), Oh-(hydroxyl radicals), and O2-2(peroxide). ROS has been a major factor for several mechanisms including cell wall damage due to Zn O-localized interaction, enhanced membrane permeability, internalization of NPs due to loss of proton motive force and uptake of toxic dissolved zinc *** have led to mitochondria weakness, intracellular outflow, and release in gene expression of oxidative stress which caused eventual cell growth inhibition and cell death. In some cases, enhanced antibacterial activity can be attributed to surface defects on Zn O abrasive surface texture. One functional application of the Zn O antibacterial bioactivity was discussed in food packaging industry where Zn O-NPs are used as an antibacterial agent toward foodborne diseases. Proper incorporation of Zn O-NPs into packaging materials can cause interaction with foodborne pathogens, thereby releasing NPs onto food surface where they come in contact with bad bacteria and cause the bacterial death and/or in

关键词： Antibacterial activity Zn O-NPs Toxicity mechanism Reactive oxygen species Zinc ions release Food antimicrobial

A new angiotensin-converting enzyme inhibitor from Peperomia pellucida(L.) Kunth

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Asian Pacific Journal of Tropical Biomedicine 2019年第6期9卷 257-262页

作者： Islamudin Ahmad Neneng siti Silfi Ambarwati Berna Elya hanita Omar Kamarza Mulia Arry Yanuar Osamu Negishi Abdul Mun'im Department of Pharmaceutical Sciences Faculty of PharmacyMulawarman UniversitySamarindaEast KalimantanIndonesia Department of Cosmetology Engineering FacultyUniversitas Negeri JakartaEast JakartaIndonesia Department of Pharmaceutical Sciences Faculty of PharmacyUniversitas IndonesiaDepokWest JavaIndonesia Chemistry Division Centre for Foundation Studies in ScienceUniversity of MalayaKuala LumpurMalaysia Department of Chemical Engineering Faculty of EngineeringUniversitas IndonesiaDepokWest JavaIndonesia Department of Applied Biochemistry Faculty of Life and Environmental SciencesUniversity of TsukubaTsukubaIbarakiJapan

Objective:To isolate,identify,and evaluate a new angiotensin-converting enzyme inhibitor from Peperomia pellucida(L.)Kunth ***:A dried sample of Peperomia pellucida herb was successively macerated with n-hexane and ethyl *** ethyl acetate extract solution was evaporated to obtain the crude *** liquid column chromatography and thin layer chromatography were performed to obtain two pure ***,both compounds were elucidated and identified using the spectroscopic ***-converting enzyme inhibitory activity studies of both compounds were determined using angiotensin-converting enzyme kit WST-1 with spectrophotometer microplate reader 96-well at 450 nm ***:Two bioactive compounds were successfully isolated from Peperomia pellucida herb,including a new compound of 2,3,5-trimethoxy-9-(12,14,15-trimethoxybenzyl)-1 h-indene and pellucidin *** compounds demonstrated angiotensin-converting enzyme inhibitory activity,with IC50 values of 72 μM(27.95 μg/mL)and 1 1μM(4.4 μg/mL),***:In the present study,two active angiotensin-converting enzyme inhibitors were successfully isolated and purified from Peperomia pellucida which is used as an antihypertensive in traditional medicine,and support its use as an angiotensin-converting enzyme-inhibiting drug.

关键词： 2,3,5-trimethoxy-9-(12,14,15-trimethoxybenzyl)-1h-indene Angiotensin-converting enzyme inhibitor Pellucidin A Peperomia pellucida(L) Kunth

Methanolic extract of Abrus precatorius promotes breast cancer MDA-MB-231 cell death by inducing cell cycle arrest at G0/G1 and upregulating Bax

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Asian Pacific Journal of Tropical Biomedicine 2019年第6期9卷 249-256页

作者： Wan Suriyani Wan-Ibrahim Norzila Ismail siti Farhanah Mohd-Salleh Aidy Irman Yajid Michael Pak-KaiWong Mohd Nizam Md hashim Department of Pharmacology School of Medical SciencesUniversiti Sains Malaysia16150Kubang KerianKelantanMalaysia Department of Pathology School of Medical SciencesUniversiti Sains Malaysia16150Kubang KerianKelantanMalaysia Department of Surgery School of Medical SciencesUniversiti Sains Malaysia16150Kubang KerianKelantanMalaysia

Objective:To determine the anti-proliferative activity of Abrus precatorius(***)leaf extracts and their effect on cell ***:*** leaves were extracted successively with hexane,ethyl acetate and methanol by Soxhlet *** extract was prepared by decoction at 50 ℃.Extracts of *** leaves were used to treat selected cancer and normal cell lines for72 ***,3-(4,5-dimethyl thiazol-2-yl)2,5-diphenyl tetrazolium bromide assay was performed to determine cell *** of cell cycle arrest,apoptosis assay and apoptosis protein expressions were determined by flow ***:Methanolic extract of *** leaves showed the lowest IC50 on MDA-MB-231 cells at(26.40±5.40)μg/*** cytometry analysis revealed that cell arrest occurred at G0/G1 phase and the apoptosis assay showed the occurrence of early apoptosis at 48 h in MDAMB-231 cells treated with methanolic extract of *** *** extract of *** leaves induced apoptosis by upregulation of Bax,p53 and caspase-3 and downregulation of ***:Methanolic extract of A precatorius leaves promotes MDA-MB-231 cell death by inducing cell cycle arrest and apoptosis possibly via the mitochondrial-related pathway.

关键词： Abrus precatorius MDA-MB-231 Apoptosis Cell cycle Breast cancer