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Wood is preferably used in civil engineering for load bearing structures and facing elements.
Introduction The durability of wooden structures can be extended by modifying the material based on the principle of wood mineralization or even petrifaction of the wood, most often using SiO2 in various forms [1].
Differences in peak shape and its magnitude on DTG and also DSC curves indicate changes in the chemical structure, which should influence thermal degradation of wood.
Vasile, Thermal degradation of lignin – a review, Cellulose chemistry and technology 44 (2010) 353–363

Immobilization of Dithizone on Coal Fly Ash in Alkaline Medium as Adsorbent of Cd(II) Ion Gina Mirandaa, Endang Tri Wahyunib, Mudasir Mudasirc,* Department of Chemistry, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia aginamiranda@mail.ugm.ac.id, bendang_triw@ugm.ac.id, cmudasir@ugm.ac.id Keywords: Fly ash, Dithizone, Adsorption, Cd(II) Abstract.
As can be seen in Fig. 2, immobilization of dithizone to the surface of AFA did not significantly change the diffraction pattern of the AFA, suggesting that dithizone immobilization did not damage the structure and crystallinity of the AFA.
[5] Liu, Z., and Liu, Y., 2015, Structure and properties of forming adsorbents prepared from different particle sizes of coal fly ash.
[12] Alberti, G., Re, S., Tivelli, A.M.C., and Biesuz, R., 2016, Smart sensory materials for divalent cations: a dithizone immobilized membrane for optical analyswas, Analyst, 141, 6140-6148 [13] Nguyen, T.C., Tran, T.D.M., Dao, V.B., and Thai, H., 2020, Using modified fly ash for removal of heavy metal ion from aqueous solution, Journal of Chemistry, 2020, 1-11 [14] Tangio, Julhim S., 2013, Adsorpsi Logam Timbal (Pb) dengan menggunakan Biomassa Enceng Gondok (Eichhorniacrassipes), Jurnal Pendidikan Kimia, FMIPA Universitas Negri Gorontalo

Expression and Characterization of Recombinant Endo-β-1,4-D-xylanases XynBTN63D from Soil Termite Abdomen in Escherichia coli BL21 (DE3) Anak Agung Istri Ratnadewi1,2,a*, Sabella Muyasyaroh1,b, Fatih Harum1,c, Wuryanti Handayani1,d and Sudarko1,e 1Department of Chemistry, FMIPA, University of Jember, Jember 68121, Indonesia 2Graduate School of Biotechnology and PUI-BioTIn, University of Jember, Jember, 68121, Indonesia a*istri_dewi.fmipa@unej.ac.id, bsabellamuyasyaroh@gmail.com, cfharum61@gmail.com, dwuriyanti.fmipa@unej.ac.id, edarko@unej.ac.id Keywords: pESC, pYHM1, induction temperature, stability, FPLC Abstract.
Replacing amino acids in the enzyme structure will affect the activity of the enzyme itself.
Several studies have shown that substituting or substituting amino acids in protein structures will have different effects on enzyme activity depending on the mutation site (Bharwadj et al, 2010).
Chemistry Department, University of Jember, Indonesia, 2019

Determination of Operating Conditions in the Synthesis of 1,3-bis(p-Hydroxyphenyl)Urea from Urea and Para-aminophenol Rizkie Husti Ananda1,a, Moh Fahrurrozi1,b, Hari Purnomo2,c 1Chemical Engineering, Engineering Department, Universitas Gadjah Mada, Yogyakarta 2Pharmaceutical Chemistry, Pharmacy Department, Universitas Gadjah Mada, Yogyakarta bmfahrurrozi@ugm.ac.id, chari_farmasi@ugm.ac.id aCorresponding author: rizkiehustiananda@mail.ugm.ac.id Keywords: Pre-reflux, 1,3 bis(p-hydroxyphenyl) urea, Synthesis reaction, Para-aminophenol Abstract.
This is due to its chemical structure, which includes functional groups that are unstable under intense reaction conditions.
Beale Jr., Wilson and Gisvold’s Textbook of Organic Medicinal and Pharmaceutical Chemistry, 11th ed., Philadelphia: Lippincott Williams & Wilkins, 2004
Pranowo, “Synthesis and Structure Elucidation of 1,3-bis(p-Hydroxyphenyl)urea,” Jurnal Ilmu Kefarmasian Indonesia, pp. 33–37, 2015

From the micro-structure diagram (Fig 9), we can clearly see that the incorporation of cumb rubber brings many different sizes of bubbles, which increases the concrete deformation and reduces it’s elastic modulus.
Namely, the crumb rubber advances concrete’s deformability in the term of internal structure.[7]~ [9]。
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)

Shayganpour et al. [12] used anodic porous titania and demonstrated 91% improvement in osseointegration, but focused on coating chemistry more than structural surface design.
These observations suggest a synergistic effect between surface chemistry, crystalline structure, and biological response.
These differences underscore the superior osseointegration potential of the anodized surface, likely due to its enhanced roughness, surface chemistry, and oxide layer composition.

The results are discussed in relation to the copolymer structure, side chain nature and molecular weight.
Chemical structure of the copolymers is shown in Fig.1.
Chemical structure of the donor-acceptor copolymers under study.
The final copolymers prepared using chlorinated solvents had the same structure and quality as those prepared in xylene or THF.
The information on electronic structure of the copolymers was obtained from the cyclic voltammetry measurements.

The bamboo like structure were obviously found at higher synthesis temperature 800°C-850°C while there were few CNTs seen at 900°C.
A precise and accurate control of synthesis condition permit to modify better structure of CNTs produced.
The CNTs produced at higher temperature start to show bamboo like structure and are associated with nontubular carbon phase; carbon particles.
The carbons atoms then diffuse over catalyst particles and start the formation of nanotubes structure.
Coville, Physical Properties of Cvd Boron-Doped Multiwalled Carbon Nanotubes, Materials Chemistry and Physics 111 (2008) 386-390

The x-ray diffraction (XRD) analysis confirmed the crystalline structure of the synthesized nanoparticles, indicating their suitability for photocatalytic applications.
Structure of methyl orange.
This confirms the cubic zinc blende structure of the nanoparticles.
Additionally, the lattice parameters (a,b,c) can also be calculated for the cubic crystal structure using Eq. 5: d = (5) where h,k,l are the Miller indices corresponding to specific diffraction planes.
Sharma for allowing the use of the chemistry lab, which played an important role in the successful completion of this research.

Synthesis of N-phenylpyrazoline Derivative from 4-Chlorobenzaldehyde and 4-Chloroacetophenone and Its Activity as an Antimalarial Agent Robby Noor Cahyonoa, Selfira Arum Andarib and Tutik Dwi Wahyuningsihc* Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21 Yogyakarta 55281, Indonesia arobby_nc@ugm.ac.id, bselfira.arum.a@gmail.com, ctutikdw@ugm.ac.id Keywords: N-phenylpyrazoline, antimalarial, chalcone, molecular docking, HPIA Assay Abstract.
The structure elucidation of the products was performed using FTIR, GC-MS, 1H- and 13C-NMR spectrometers.
The simple structure and low-cost synthesis of chalcones have attracted the attention of chemists to develop various chalcone derivatives to treat several diseases, including malaria [12].
The free heme crystal structure receptor was obtained from the Protein Data Bank (www.rcsb.org) (PDB: 3P5Q).
The three-dimensional structure of N-phenylpyrazoline dan chalcone was drawn using GaussView 5.0 [16] and was optimized using DFT/B3LYP with 6-311G basis set by employing Gaussian 09 software [17].