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https://www.readbyqxmd.com/read/28549863/isolation-and-characterization-of-microcrystalline-cellulose-from-roselle-fibers
#1
Lau Kia Kian, Mohammad Jawaid, Hidayah Ariffin, Othman Y Alothman
In this study, microcrystalline cellulose (MCC) was extracted from roselle fiber through acid hydrolysis treatment and its properties were compared with those of commercially available MCC. The physicochemical and morphological characteristics, elemental composition, size distribution, crystallinity and thermal properties of the obtained MCC were analyzed in this work. Fourier transform infrared spectroscopy (FTIR) analysis provided clear evidence that the characteristic peak of lignin was absent in the spectrum of the MCC prepared from roselle fiber...
May 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28546037/developing-alternative-over-the-counter-medicine-label-formats-how-do-they-compare-when-evaluated-by-consumers
#2
Vivien Tong, David K Raynor, Parisa Aslani
BACKGROUND: In recent years, the Australian Therapeutic Goods Administration (TGA) has proposed implementing a standardized over-the-counter (OTC) medicine label. However, there were mixed consumer opinions regarding a label proposed in 2012 and limited evidence demonstrating the usability of the revised (2014) format. OBJECTIVE: To develop and examine the usability of alternative OTC medicine label formats for standardization, and explore consumer perspectives on the labels...
March 9, 2017: Research in Social & Administrative Pharmacy: RSAP
https://www.readbyqxmd.com/read/28544988/co-gasification-of-bituminous-coal-and-hydrochar-derived-from-municipal-solid-waste-reactivity-and-synergy
#3
Juntao Wei, Qinghua Guo, Qing He, Lu Ding, Kunio Yoshikawa, Guangsuo Yu
In this work, the influences of gasification temperature and blended ratio on co-gasification reactivity and synergy of Shenfu bituminous coal (SF) and municipal solid waste-derived hydrochar (HTC) were investigated using TGA. Additionally, active alkaline and alkaline earth metal (AAEM) transformation during co-gasification was quantitatively analyzed by inductively coupled plasma optical emission spectrometer for correlating synergy on co-gasification reactivity. The results showed that higher char gasification reactivity existed at higher HTC char proportion and gasification temperature, and the main synergy behaviour on co-gasification reactivity was performed as synergistic effect...
May 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28543795/permanent-nonselective-his-bundle-pacing-in-an-adult-with-l-transposition-of-the-great-arteries-and-complete-av-block
#4
Adam C Kean, W Aaron Kay, Jyoti K Patel, John M Miller, Gopi Dandamudi
We report the placement of a permanent transvenous nonselective His bundle pacing lead in conjunction with a transvenous pacemaker/ICD in an adult with Levo-Transposition of the Great Arteries (L-TGA) and a stenotic coronary sinus (CS) ostium (os), which would not accommodate a transvenous LV pacing lead. Nonselective His bundle pacing provided a nearly identical ventricular activation pattern in this previously unpaced patient. Many L-TGA patients will have an eventual need for permanent pacing and, given the challenges of CS cannulation, His bundle pacing may represent a preferred modality rather than pure morphologic LV pacing or surgical systemic ventricular lead placement to achieve optimal electrical synchrony...
May 24, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28541952/synthesis-and-application-of-a-ternary-composite-of-clay-saw-dust-and-peanut-husks-in-heavy-metal-adsorption
#5
Henry H Mungondori, Sandile Mtetwa, Lilian Tichagwa, David M Katwire, Pardon Nyamukamba
The adsorption of a multi-component system of ferrous, chromium, copper, nickel and lead on single, binary and ternary composites was studied. The aim of the study was to investigate whether a ternary composite of clay, peanut husks (PH) and saw-dust (SD) exhibited a higher adsorption capacity than that of a binary system of clay and SD as well as a single component adsorbent of PH alone. The materials were used in their raw state without any chemical modifications. This was done to retain the cost effective aspect of the naturally occurring adsorbents...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541818/preparation-and-characterization-of-monodisperse-microcapsules-with-alginate-and-bentonite-via-external-gelation-technique-encapsulating-pseudomonas-putida-rs-198
#6
Xuan Li, Zhansheng Wu, Yanhui He, Bang-Ce Ye, Jun Wang
This paper evaluated the external gelation technique for preparing microcapsules. The microcapsules were consisted of Pseudomonas putida Rs-198 (Rs-198) core and sodium alginate (NaAlg)-bentonite (Bent) shell. Different emulsification rotation speeds and core/shell ratios were used to prepare the microcapsules of each formulation. The near-spherical microcapsules were monodisperse with a mean diameter of 25 μm to 100 μm and wrinkled surfaces. Fourier transform infrared spectrophotometry (FTIR) and thermogravimetric analysis (TGA) revealed the physical mixture of the wall material and the superior thermal stability of the microcapsules...
May 25, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28541719/the-studies-of-archaeological-pottery-with-the-use-of-selected-analytical-techniques
#7
Joanna Kałużna-Czaplińska, Angelina Rosiak, Jacek Grams, Karolina Chałupka, Przemysław Makarowicz, Waldemar Maniukiewicz, Elżbieta Szubiakiewicz
Modern analytical methods play an important role in archaeological objects, including ceramics. This review focuses on the use of analytical methods such as: gas chromatography coupled mass spectrometry (GC/MS), Fourier transform infrared spectroscopy (FTIR), Time-of-flight secondary ion mass spectrometry (ToF-SIMS), Powder X-ray diffraction (XRD) with thermal analysis (TGA-MS) to study the chemical and mineralogical composition of archaeological samples and organic residues preserved inside. In this paper, special attention was paid to the ToF-SIMS method, which allows the determination of characteristic ions on the surface of ceramic samples...
May 25, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28534917/charge-stabilizing-tris-triphenylamine-zinc-porphyrin-carbon-nanotube-hybrids-synthesis-characterization-and-excited-state-charge-transfer-studies
#8
Luis M Arellano, Myriam Barrejón, Habtom B Gobeze, María J Gómez-Escalonilla, José Luis G Fierro, Francis D'Souza, Fernando Langa
Functionalization of single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs) with a charge stabilizing zinc porphyrin functionalized with triphenylamine entities has been accomplished. The synthetic approach involved the reaction of tris-(triphenylamine)porphyrinato zinc(ii) with iodobenzene functionalized nanotubes through a Sonogashira C-C cross coupling reaction under microwave irradiation conditions. Evidence of covalent functionalization and the extent of functionalization was obtained from systematic studies carried out by AFM, TGA, XPS and Raman spectroscopy techniques...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28532978/tga-vsd-and-subpulmonary-conus-from-fetus-to-a-3-dimensional-model
#9
Begoña Manso, Lutgardo García-Díaz, Israel Valverde
No abstract text is available yet for this article.
May 19, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28532096/preparation-of-nanocrystalline-forsterite-by-combustion-of-different-fuels-and-their-comparative-in-vitro-bioactivity-dissolution-behaviour-and-antibacterial-studies
#10
Rajan Choudhary, Prasanth Manohar, Jana Vecstaudza, Maria Josefa Yáñez-Gascón, Horacio Pérez Sánchez, Ramesh Nachimuthu, Janis Locs, Sasikumar Swamiappan
This study presents different fuels (Glycine and Urea) that can be used to synthesize nanocrystalline forsterite by the sol-gel combustion method. The weight change of precursor during thermal treatment was studied by thermo-gravimetric analysis (TGA). Pure forsterite was characterized by heating microscopy, Fourier transform infrared spectroscopy, X-ray Diffraction, Brunauer-Emmett-Teller, Scanning Electron Microscopy, and Energy dispersive X-ray spectroscopy. The HAP (hydroxyapatite) deposition ability, degradation and dissolution behaviour of forsterite was examined in simulated body fluid (SBF)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532088/mussel-inspired-surface-modification-of-titania-nanotubes-as-a-novel-drug-delivery-system
#11
Negin Khoshnood, Ali Zamanian, Abouzar Massoudi
Titania nanotubes (TNTs) have attracted considerable attention for the development of new devices for local drug delivery applications. In this study TNTs were synthesized by hydrothermal method from titania nanoparticles and then the surface of TNTs were functionalized by in situ polymerization of bioinspired polydopamine (PDA). The proposed strategies emphasized on remarkable properties of these materials and their unique combination to design local drug delivery system with advanced performance. The samples were characterized using Transmission Electron Microscope (TEM), Field Emission Scanning Electron Microscope (FESEM), X-ray diffraction pattern (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and surface area analysis (BET)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532078/enhancement-of-fibroblast-growing-on-the-mannosylated-surface-of-cellulose-membranes
#12
Simone Birkheur, Paula Cristina de Sousa Faria-Tischer, Cesar A Tischer, Elisângela Flávia Pimentel, Marcio Fronza, Denise Coutinho Endringer, Anna Paola Butera, Renato Márcio Ribeiro-Viana
Bacterial cellulose membrane is a biomaterial with high value in the biomedical field. Many groups have been making efforts to promote chemical modifications of its structure and, consequently, add new characteristics. Recently, our group has developed a methodology to insert monoester succinic acid in bacterial cellulose membrane without disrupting the microfibril network and bind a protein on it. Considering the role of carbohydrates in the molecular recognition process in biological events, we continued these studies by inserting covalently multiples copies of aryl monosaccharide to bacterial cellulose succinylated and to study the in vitro tissue compatibility using fibroblasts...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532070/ribose-mediated-crosslinking-of-collagen-hydroxyapatite-hybrid-scaffolds-for-bone-tissue-regeneration-using-biomimetic-strategies
#13
Gopal Shankar Krishnakumar, Natalia Gostynska, Elisabetta Campodoni, Massimiliano Dapporto, Monica Montesi, Silvia Panseri, Anna Tampieri, Elizaveta Kon, Maurilio Marcacci, Simone Sprio, Monica Sandri
This study explores for the first time the application of ribose as a highly biocompatible agent for the crosslinking of hybrid mineralized constructs, obtained by bio-inspired mineralization of self-assembling Type I collagen matrix with magnesium-doped-hydroxyapatite nanophase, towards a biomimetic mineralized 3D scaffolds (MgHA/Coll) with excellent compositional and structural mimicry of bone tissue. To this aim, two different crosslinking mechanisms in terms of pre-ribose glycation (before freeze drying) and post-ribose glycation (after freeze drying) were investigated...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532028/newly-isolated-sporopollenin-microcages-from-platanus-orientalis-pollens-as-a-vehicle-for-controlled-drug-delivery
#14
Muhammad Mujtaba, Idris Sargin, Lalehan Akyuz, Talip Ceter, Murat Kaya
Sporopollenin microcages were produced from the pollens of Platanus orientalis. Paracetamol was loaded into the microcages. Pollen, sporopollenin, paracetamol and paracetamol-loaded sporopollenin microcages were characterized with FT-IR, TGA and SEM. The analytical analyses demonstrated that sporopollenin microcages were structurally intact, highly reticulated and thermally stable. The loading efficiency of the sporopollenin microcages was found to be 8.2% using the passive loading technique and 23.7% via evaporating loading technique...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531855/investigation-on-the-fast-co-pyrolysis-of-sewage-sludge-with-biomass-and-the-combustion-reactivity-of-residual-char
#15
Shuanghui Deng, Houzhang Tan, Xuebin Wang, Fuxin Yang, Ruijie Cao, Zhao Wang, Renhui Ruan
Gaining the valuable fuels from sewage sludge is a promising method. In this work, the fast pyrolysis characteristics of sewage sludge (SS), wheat straw (WS) and their mixtures in different proportions were carried out in a drop-tube reactor. The combustion reactivity of the residual char obtained was investigated in a thermogravimetric analyzer (TGA). Results indicate that SS and WS at different pyrolysis temperatures yielded different characteristic gas compositions and product distributions. The co-pyrolysis of SS with WS showed that there existed a synergistic effect in terms of higher gas and bio-oil yields and lower char yield, especially at the WS adding percentage of 80wt%...
April 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28530556/antibacterial-electrospun-zein-nanofibrous-web-encapsulating-thymol-cyclodextrin-inclusion-complex-for-food-packaging
#16
Zeynep Aytac, Semran Ipek, Engin Durgun, Turgay Tekinay, Tamer Uyar
Thymol (THY)/γ-Cyclodextrin(γ-CD) inclusion complex (IC) encapsulated electrospun zein nanofibrous webs (zein-THY/γ-CD-IC-NF) were fabricated as a food packaging material. The formation of THY/γ-CD-IC (1:1 and 2:1) was proved by experimental (X-ray diffraction (XRD), thermal gravimetric analysis (TGA), (1)H NMR) and computational techniques. THY/γ-CD-IC (2:1) exhibited higher preservation rate and stability than THY/γ-CD-IC (1:1). It is worth mentioning that zein-THY/γ-CD-IC-NF (2:1) preserved much more THY as observed in TGA and stability of THY/γ-CD-IC (2:1) was higher, as shown by a modelling study...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28530541/synthesis-of-new-antibacterial-cubane-based-nanocomposite-and-its-application-in-combination-cancer-therapy
#17
Elham Zakerzadeh, Roya Salehi, Mehrdad Mahkam
BACKGROUND: The need for therapeutically effective anticancer drug delivery systems constantly persuades researchers to explore novel strategies. OBJECTIVE: In this study a novel cubane based antibacterial nanocomposite was tailored as dual chemotherapy drug delivery vesicle in order to increase the therapeutic outcome in cancer therapy. METHOD: The physico-chemical characterization of engineered nanocarrier was assessed by Fourier transforms infrared spectroscopy (FTIR), Hydrogen nuclear magnetic resonance spectroscopy (1H NMR), Thermogravimetric analysis (TGA), and Field emission scanning electron microscopy-energy dispersive using X-ray (FESEM-EDX)...
May 22, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28529039/municipal-solid-waste-processing-and-separation-employing-wet-torrefaction-for-alternative-fuel-production-and-aluminum-reclamation
#18
Gea Fardias Mu'min, Pandji Prawisudha, Ilman Nuran Zaini, Muhammad Aziz, Ari Darmawan Pasek
This study employs wet torrefaction process (also known as hydrothermal) at low temperature. This process simultaneously acts as waste processing and separation of mixed waste, for subsequent utilization as an alternative fuel. The process is also applied for the delamination and separation of non-recyclable laminated aluminum waste into separable aluminum and plastic. A 2.5-L reactor was used to examine the wet torrefaction process at temperatures below 200°C. It was observed that the processed mixed waste was converted into two different products: a mushy organic part and a bulky plastic part...
May 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28528947/syntrophic-association-of-termite-gut-bacterial-symbionts-with-bifunctional-characteristics-of-cellulose-degrading-and-polyhydroxyalkanoate-producing-bacteria
#19
Balasubramanian Cibichakravarthy, Subramani Abinaya, Solai Ramatchandirane Prabagaran
The guild between higher termites and their partnership with the diverse community of bacteria and archaea in their gut is a marvel evolutionary achievement. Sustained attempts were made worldwide with a quest for identifying viable important biological macromolecule polyhydroxyalkanoate (PHA) accumulating bacteria. Termite gut serve as a novel source for bacteria with dual properties like PHA production as well as cellulose degradation. Among 40 isolates cultivated, 32.5% turned positive for PCR based screening of PhaC gene...
May 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28527339/selective-removal-of-toxic-cr-vi-from-aqueous-solution-by-adsorption-combined-with-reduction-at-a-magnetic-nanocomposite-surface
#20
Nazia H Kera, Madhumita Bhaumik, Kriveshini Pillay, Suprakas Sinha Ray, Arjun Maity
The adsorption of toxic hexavalent chromium (Cr(VI)) and its reduction to trivalent chromium (Cr(III)) are important processes for the treatment of industrial wastewater. Conducting polymers can adsorb and reduce Cr(VI) to less toxic Cr(III) but have low adsorption capacities due to agglomeration of particles and are difficult to separate from treated water. In this study, magnetic polypyrrole (PPy)-polyaniline (PANI)/iron oxide (Fe3O4) nanocomposite was synthesized for the selective removal of Cr(VI) in aqueous solution...
May 10, 2017: Journal of Colloid and Interface Science
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