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All Journal Techno: Jurnal Penelitian Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Acta Chimica Asiana Nexus
Annisha Noor Diena
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Lampung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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PENERAPAN PROBLEM SOLVING UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR LANCAR PADA MATERI ASAM BASA Annisha Noor Diena; Ratu Betta Rudibyani; Tasviri Efkar
Jurnal Pendidikan dan Pembelajaran Kimia Vol 4, No 3 (2015): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (139.411 KB)

Abstract

This research were intended to describe the practicality, effectivility, and effect size of problem solving model to improve fluency thinking abiltiy on Arrhenius acid base theory. This research used one group pretest postttest design in which the 11th grade of science-5, was choosen as sample based on cluster random sampling . The aspect of practicality was determined by lesson plan study implementation based on teacher observation and conspicuousness of model based on students response. The aspect of effectivi-lity was determined by average n-Gain of students`s concept mastery in exami-niation and student activity during the learning process. The aspect of effect size(r) was determined by mean of pretest and posttest in which r score was calculated by using Cohen`s formula. The result that problem solving model has high criteria of practicality and effectivility and large effect size to improve fluency thinking ability.Penelitian ini bertujuan untuk mendeskripsikan kepraktisan, keefektifan, dan ukuran pengaruh model problem solving dalam meningkatkan kemampuan berpikir lancar siswa pada materi asam basa Arrhenius. Penelitian ini menggunakan one group pretest posttest design dengan menggunakan teknik cluster random sampling diperoleh sampel kelas XI IPA5. Aspek kepraktisan ditentukan dari keterlaksanaan RPP berdasarkan obser-vasi guru dan kemenarikan model berdasarkan respon siswa. Aspek keefektifan ditentukan dari rata-rata n-Gain hasil penguasaan konsep di awal dan akhir pem-belajaran dan aktivitas siswa selama proses pembelajaran. Ukuran pengaruh(r) ditentukan dari rata-rata nilai pretes dan postes dengan nilai r dihitung meng-gunakan rumus cohen. Hasil penelitian menunjukan bahwa model problem solving memiliki kepraktisan dan keefektivan sangat tinggi serta memiliki ukuran pengaruh besar dalam meningkatkan kemampuan berpikir lancar siswa.Kata kunci :kepraktisan, keefektivitasan, problem solving, ukuran pengaruh
Magnetic Zeolite Composites for Heavy Metal Ions Removal: A Concise Review Gracias, Wayan; Dienna, Annisha Noor; Permatasari, Defia Indah
Nexus Sains dan Teknologi Vol. 1 No. 2 (2025): Nexus: Jurnal Sains dan Teknologi
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v1i2.2880

Abstract

Magnetic zeolite is a composite material that combines the porous characteristics of zeolite with the magnetic separation capability of magnetic nanoparticles. This study discusses the development of magnetic zeolite synthesis using several main methods, including hydrothermal synthesis, coprecipitation, and dry-gel conversion, each offering different levels of control over particle size, surface area, and magnetic strength of the resulting composite. The synthesized materials generally possess a high surface area and strong magnetic response, making  them  effective  for adsorbing heavy metal ions from aqueous solutions. The reported maximum adsorption capacities reach 625 mg g⁻¹ for Pb(II), 204 mg g⁻¹ for Cd(II), 181 mg g⁻¹ for Cu(II), more than 400 mg g⁻¹ for Cr(VI), and around 42 mg g⁻¹ for Ni(II). According to various studies, the adsorption of heavy metal ions onto magnetic zeolite commonly follows the pseudo-second-order kinetic model and the Langmuir isotherm, indicating that the adsorption process is dominated by a monolayer chemisorption mechanism. In addition to its high adsorption capacity, the main advantage of magnetic zeolite is the ease of separating it from the solution using an external magnetic field, making it an efficient adsorbent that can be easily recovered and reused.
Screening Virtual Senyawa Turunan Azo-Asetohidrazida sebagai Inhibitor Potensial Alfa-Glukosidase Muhammad Zulqurnain; Sakti Hidayati Fikriya; Andi Suharman; Annisha Noor Dienna; First Ambar Wati
Acta Chimica Asiana Vol. 8 No. 2 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i2.263

Abstract

Type 2 diabetes mellitus is a progressive metabolic disorder marked by persistent hyperglycemia resulting from insulin resistance, insufficient insulin secretion, or a combination of both conditions. A potential therapeutic target for treating this illness is the suppression of the alpha-glucosidase enzyme, which is a key regulator of postprandial glucose absorption and carbohydrate metabolism. This work conducted a thorough in silico analysis to evaluate the efficacy of three synthesised azo-acetohydrazide derivatives (designated compounds C, D, and E) as alpha-glucosidase inhibitors. Pharmacokinetic properties and drug-likeness characteristics were evaluated using the SwissADME platform, while molecular docking simulations were conducted with AutoDockTools against the alpha-glucosidase enzyme structure sourced from the Protein Data Bank (PDB ID: 3W37), utilising acarbose as a reference inhibitor. All three compounds adhered to essential drug-likeness criteria, including those established by Lipinski, Veber, and Ghose, and exhibited advantageous physicochemical characteristics, such as appropriate molecular weight, lipophilicity, topological polar surface area, and aqueous solubility. The compounds were anticipated to have significant gastrointestinal absorption and had no ability to penetrate the blood-brain barrier, suggesting a minimal risk of central nervous system damage. Compound E demonstrated the highest binding affinity among the compounds, with a docking score of –7.80 kcal/mol, and formed multiple stabilising interactions within the enzyme's active region, such as hydrogen bonds, hydrophobic contacts, and electrostatic interactions. This study's novelty is the computational discovery of azo-acetohydrazide scaffolds as inadequately investigated chemical entities with potential antidiabetic properties. These findings establish a theoretical basis for continued development and substantiate future endeavours in the synthesis and experimental validation of these molecules. This study validates the efficacy of structure-based drug design in discovering novel alpha glucosidase inhibitors and identifies compound E as a good candidate for further in vitro and in vivo research in type 2 diabetes treatment.
Atomic Charge Reveals Global Electron Redistribution in Substituted Benzene: A Semiempirical Quantum Study Annisha Noor Dienna; Maula Nabila Alika Fitri; Novalia Nurbaiti; Prisca Caesa Moneteringtyas; Keysia Claudia Sagala
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

This study investigates the electronic influence of electron-donating substituents on the C₀ of substituted benzene systems using a computational chemistry approach. Aromatic systems exhibit complex electron density redistribution governed by π-electron delocalization, where substituent effects propagate across the entire ring rather than remaining localized. To systematically evaluate this behavior, eleven benzene derivatives representing alkyl, amino, and oxygen-containing substituents were modeled and analyzed using the semiempirical AM1 method implemented in ORCA. Atomic charge variations at the C₀ position were calculated relative to benzene and examined using both Mulliken and Löwdin population analyses to ensure methodological consistency. The results reveal that electron-donating groups do not necessarily increase electron density locally at the C₀; instead, the donated electron density is redistributed throughout the aromatic π-system. Alkyl substituents show minimal charge variation, indicating weak inductive effects, while amino groups exhibit moderate influence through resonance interactions without significant localization at C₀. Oxygen-containing substituents, particularly phenol and alkoxy derivatives, demonstrate stronger electronic perturbations due to effective lone-pair resonance donation. Notably, ethoxybenzene displays anomalous behavior, suggesting a combined influence of resonance and additional inductive contributions from its alkyl chain. Despite differences in absolute values, both population analysis methods produce consistent trends, supporting the robustness of the findings. Overall, this study highlights that ΔC₀ serves as an indicator of global electron redistribution rather than localized charge accumulation, providing a more physically meaningful interpretation of substituent effects in aromatic systems
Co-Authors Andi Suharman Defia Indah Permatasari First Ambar Wati Gracias, Wayan Keysia Claudia Sagala Maula Nabila Alika Fitri Muhammad Zulqurnain Novalia Nurbaiti Prisca Caesa Moneteringtyas Ratu Betta Rudibyani Sakti Hidayati Fikriya Tasviri Efkar