scholarly journals AKTIVITAS ANTIBAKTERI DAN ANTIBIOFILM NANOKOMPOSIT SENG OKSIDA-PERAK (ZnO-Ag) DENGAN MINYAK CENGKEH TERHADAP Pseudomonas aeruginosa

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Yulianto Ade Prasetya ◽  
Khoirun Nisyak ◽  
A'yunil Hisbiyah
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pseudomonas Aeruginosa ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
One Pot Synthesis ◽  
O 18 ◽  
Scanning Electron

Pseudomonas aeruginosa is a Gram-negative bacterium that often causes nosocomial infection because of its ability to produce biofilms so that it is resistant to various antibiotics. This research aims to determine the activity of zinc oxide-silver nanocomposites (ZnO-Ag) with clove oil against P. aerugoinosa bacteria. ZnO-Ag nanocomposites were made using the Green One Pot Synthesis technique using a sonicator and microwave instruments. The nanocomposites formed were characterized by X-Ray Diffraction (XRD) to determine crystallinity and particle size and Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) to determine morphology and elements. The antibacterial activity and antibiofilm tests were carried out using the well diffusion and the microplate techniques, respectively. The resulted ZnO-Ag nanocomposite formed had a size of 19.66 nm, where Ag (47%) was of round shape, while Zn (35%) and O (18%) were fibrous. The ZnO-Ag had an inhibition zone of 14.9 mm against P. aeruginosa and was able to prevent the attachment of the bacterial biofilm for 48 hours with 76,59% inhibition percentage. Pseudomonas aeruginosa merupakan bakteri Gram negatif yang sering menyebabkan infeksi noskomial karena kemampuannya menghasilkan biofilm sehingga resisten terhadap berbagai antibiotik. Penelitian ini bertujuan untuk mengetahui aktivitas nanokomposit seng oksida-perak (ZnO-Ag) dengan minyak cengkeh terhadap P. aeruginosa. Nanokomposit ZnO-Ag dibuat dengan teknik Green One Pot Synthesis menggunakan instrumen sonikator dan gelombang mikro. Nanokomposit yang terbentuk dikarakterisasi menggunakan X-Ray Diffraction (XRD) untuk mengetahui kristalinitas dan ukuran partikel, Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) untuk mengetahui morfologi dan unsur yang terbentuk. Uji aktivitas antibakteri dilakukan dengan metode difusi sumuran dan uji antibiofilm dilakukan dengan teknik microplate. Hasil nanokomposit ZnO-Ag yang terbentuk memiliki ukuran sebesar 19,66 nm, dimana Ag (47%) berbentuk bulat sedangkan Zn (35%) dan O (18%) berbentuk fiber. Nanokomposit ZnO-Ag memunculkan zona hambat 14,9 mm terhadap P. aeruginosa dan mampu mencegah penempelan biofilm yang dihasilkan bakteri tersebut selama 48 jam dengan penghambatan 76,59%.

Structural Characterization of Gallbladder Stones Using Energy Dispersive X-ray Spectroscopy and X-ray Diffraction

2018 ◽  
Vol 21 (7) ◽  
pp. 495-500 ◽  
Author(s):  
Hassan A. Almarshad ◽  
Sayed M. Badawy ◽  
Abdalkarem F. Alsharari
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
Major Health Problem ◽  
X Ray ◽  
Gallbladder Stones ◽  
Pure Cholesterol ◽  
Scanning Electron

Aim and Objective: Formation of the gallbladder stones is a common disease and a major health problem. The present study aimed to identify the structures of the most common types of gallbladder stones using X-ray spectroscopic techniques, which provide information about the process of stone formation. Material and Method: Phase and elemental compositions of pure cholesterol and mixed gallstones removed from gallbladders of patients were studied using energy-dispersive X-ray spectroscopy combined with scanning electron microscopy analysis and X-ray diffraction. Results: The crystal structures of gallstones which coincide with standard patterns were confirmed by X-ray diffraction. Plate-like cholesterol crystals with laminar shaped and thin layered structures were clearly observed for gallstone of pure cholesterol by scanning electron microscopy; it also revealed different morphologies from mixed cholesterol stones. Elemental analysis of pure cholesterol and mixed gallstones using energy-dispersive X-ray spectroscopy confirmed the different formation processes of the different types of gallstones. Conclusion: The method of fast and reliable X-ray spectroscopic techniques has numerous advantages over the traditional chemical analysis and other analytical techniques. The results also revealed that the X-ray spectroscopy technique is a promising technique that can aid in understanding the pathogenesis of gallstone disease.

scholarly journals The Characteristics of Padamarang Magnesite under Calcination and Hydrothermal Treatment

2019 ◽  
Vol 29 (2) ◽  
Author(s):  
Mutia Dewi Yuniati ◽  
Feronika Cinthya Mawarni Putri Wawuru ◽  
Anggoro Tri Mursito ◽  
Iwan Setiawan ◽  
Lediyantje Lintjewas
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Hydrothermal Treatment ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Magnesite (MgCO3) is the main source for production of magnesium and its compound. In Indonesia, magnesite is quite rare and can be only found in limited amount in Padamarang Island, Southeast Sulawesi Provence. Thus the properties of magnesite and the reactivity degree of the obtained product are of technological importance. The aim of this work was to analyze the characteristics of Padamarang magnesite under calcination and hydrothermal treatment processes. The processes were carried out at various temperatures with range of 150-900°C for 30 minutes. The solids were characterized with respect to their chemical and physical properties by using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). SEM image indicates that magnesite was formed from thin and flat hexagon sheets. The FTIR and XRD analysis disclose that MgO formed at temperature above 300°C, where as the magnesite sample also lost its mass around 50%. These results demonstrate that Padamarang magnesite decomposes to magnesium oxide and carbon dioxide at high temperature.Magnesit (MgCO3) merupakan sumber utama untuk produksi magnesium dan senyawa-senyawanya. Di Indonesia, magnesit cukup jarang dan hanya dapat ditemukan dalam jumlah yang terbatas di Pulau Padamarang, Propinsi Sulawesi Tenggara. Oleh karena itu sifat magnesit dan derajat reaktivitas dari produk-produk magnesit penting untuk diketahui. Penelitian ini bertujuan untuk menganalisis karakteristik magnesit Padamarang dengan perlakuan kalsinasi dan hidrothermal.  Proses dilakukan pada temperatur yang bervariasi dari 150-900°C selama 30 menit. Sifat kimia dan fisika dari magnesit dikarakterisasi dengan menggunakan scanning electron microscopy dengan energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FTIR), dan X-ray diffraction (XRD). Gambar dari analisis SEM menunjukkan bahwa magnesit terbentuk dari lembaran-lembaran heksagonal yang tipis dan datar. Hasil analisis dengan FTIR dan XRD menunjukkan bahwa MgO terbentuk pada temperatur diatas 300°C, dimana sampel magnesit juga kehilangan massanya sekitar 50% pada suhu tersebut. Hal ini menunjukkan bahwa Magnesit Padamarang terdekomposisi menjadi magnesium oksida dan karbon dioksida pada temperatur tinggi.

scholarly journals Supplemental Material: Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils

2020 ◽  
Author(s):  
Ross Anderson ◽  
et al.
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antibacterial Properties ◽  
Energy Dispersive ◽  
Burgess Shale ◽  
X Ray Diffraction ◽  
X Ray ◽  
Early Formation ◽  
Data Tables ◽  
Scanning Electron

Supplemental methodological details, antibacterial properties of clays, other minerals with distinct fossil/matrix distributions, summaries of mineralogy by taxon, data tables, statistical summaries, and light/scanning electron microscopy–energy-dispersive X-ray spectroscopy images of fossil specimens showing X-ray diffraction selected areas.<br>

Study on the Mechanism of Magnesium Sulfate to Cement and C-S-H Gel

2011 ◽  
Vol 243-249 ◽  
pp. 4687-4690 ◽  
Author(s):  
Xiu Juan Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Sulfate ◽  
Energy Dispersive Spectroscopy ◽  
Concrete Strength ◽  
Energy Dispersive ◽  
Test Block ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The microstructure of cement test block and the C-S-H gel attacked by magnesium sulfate is observed by means of scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).It is found that the presence of Mg2+ makes C-S-H gel decalcify, dissolve and decompose, which thereby increasing the erosion of SO42- on the concrete. The decomposition of C-S-H and the generation of M-S-H result in the loss of concrete strength and the ultimate destruction of concrete.

Composition and Microstructures of Imperial Brass Chinese Coins

2010 ◽  
Vol 636-637 ◽  
pp. 531-537 ◽  
Author(s):  
M.J. Furtado ◽  
Rui Jorge C. Silva ◽  
M.F. Araújo ◽  
Francisco Manuel Braz Fernandes
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Equilibrium Phase ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fine Grained ◽  
Minor Elements ◽  
Brass Alloys ◽  
Scanning Electron

Twenty brass Chinese cash coins with complex compositions were studied for a better understanding of the metallurgical cash production in China, during the 17th, 18th and 19th centuries. Elemental composition was obtained through energy-dispersive micro X-ray fluorescence spectrometry of small cleaned areas on the coins rims. Results showed that these brass alloys (Cu-Zn) frequently contain up to 3% Sn, have highly variable Pb content (from n.d. up to 14%) and Fe, Sb, and As as minor elements. Microstructures were assessed by optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, and preliminary micro X-ray diffraction analysis. All the coins present typical as-cast microstructures although very fine-grained, which are supported by binary (Cu-Zn) and ternary (Cu-Zn-Sn) equilibrium phase diagrams, that explain microstructural differences due to the presence of Sn in these brasses.

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