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The approximate solution to the Schrödinger equation of exotic doubly muonic helium-like systems has been obtained using a simple matrix method based on hydrogenic s-states. Each system considered consists of a positively charged nucleus surrounded by 2 negatively charged muons XZ+μ-μ- (2 Z 36). The present work aims to obtain approximate ground-state energies of the systems and to decompose the energies in terms of the basis states used. Here, the wave function was expressed as a linear combination of 15 eigenfunctions, each written as the product of two hydrogenic s-states. The elements of the Hamiltonian matrix were calculated and finally, the energy eigenvalue equation was numerically solved to obtain the ground-state energies of the systems with their corresponding eigenvectors. From the results, ground-state energies of all systems were in agreement with others from the literature, with percentage differences between 0.03% and 2.05%. The analysis of the probability amplitudes from the eigenvectors showed that the 1s1s state made the largest contribution to the ground state energies of the systems, approaching 90.99%, 96.98% and 98.54% for He2+μ-μ- , Li3+μ-μ- , and Be4+μ-μ- , respectively. Keywords: Doubly muonic helium-like systems, ground state energy, hydrogenic basis states, matrix mechanics, Schrödinger equation

Urease is an enzyme that functions as a catalyst in the hydrolysis of urea into ammonia and carbon dioxide. The industrial sector has made extensive use of urease. To date, enzymes are used in free form, deemed less effective. Therefore, enzymes are used in immobilized form because they can be utilized repeatedly. This research aimed to isolate urease from kidney bean (Phaseolus vulgaris L.) seed and immobilize it using a Ca-alginate support matrix and a trapping technique. Eight days were devoted to germinating kidney bean seeds to begin the investigation. Isolation of crude urease extract from kidney beans was carried out using phosphate buffer pH 7. It was then immobilized with Ca-alginate at different concentrations of Na-alginate and contact times The crude free and immobilized urease extract was further characterized including pH, temperature and stability of repeated use. The urease activity was determined using the Nessler method using a spectrophotometer. The results demonstrated that urease immobilization from kidney bean seeds with a Ca-alginate matrix was most effective at a concentration of 5% Na-alginate and a contact period of 60 minutes, yielding a value of 5.92 U/mL. The optimal pH of free and immobilized urease was 7 and 8, respectively, and temperatures of 35 and 40 °C, respectively. The immobilization of urease from kidney bean seeds using a Ca-alginate support matrix increased the stability of recurrent use by fivefold, while the relative urease activity remained at 52%.

Development of anionic surfactant compound isvery important because the anionic surfactant class iswidely used in people's lives. For instance,anionic surfactantsare used as food additives and detergents. The novelcompound of sulfonate-basedsurfactantor proposed compound has predictedthe CriticalMicelle Concentration(CMC) value of experiment. Quantitative Structure-Property Relationship (QSPR)analysisbased on semiempiricalZINDO/1 calculationwas conducted to obtain QSPR equation. Theoretical predictorsor independent variable which have an influence on the value of CMC are used to construct QSPR equation. The theoretical predictors areclassified intopredictor of electronic properties, solubility and steric. A total of 108experimentalCMCbelongs to sulfonate-basedsurfactant are calculated their theoretical predictors and analyzed by multiple linear regression. The QSPR equationwhich is obtainedfromthis study contains theimportant theoretical predictors.They are solubility properties, molecular weight, molecular size and net charge of carbon atomin thepolar partof sulfonate-based surfactant. This QSPR equation couldbe used to predict the CMC value of the novelsulfonate-based surfactant.

Abstrak Enterobacter aerogenes merupakan bakteri penyebab berbagai macam infeksi. Salah satu pengobatan berbagai penyakit infeksi yaitu dengan pemberian antibiotik. Penggunaan antibiotik sintetik secara terus menerus dapat menyebabkan resistensi, sehingga untuk mengatasinya diperlukan pencarian bahan obat alami seperti ekstrak tanaman yang berpotensi sebagai antibakteri, salah satunya yaitu ekstrak daun mangga bacang (Mangifera foetida L.). Penelitian ini bertujuan untuk mengetahui potensi ekstrak daun mangga bacang sebagai antibakteri terhadap E. aerogenes, penentuan konsentrasi hambat tumbuh minimum (KHTM) dan mengidentifikasi golongan senyawa aktif dari ekstrak daun mangga bacang. Ekstrak daun mangga bacang diperoleh dengan cara maserasi menggunakan metanol. Ekstrak yang diperoleh diuji aktivitas antibakteri dengan menggunakan metode difusi sumur. Konsentrasi yang digunakan 1000 ppm, kontrol positif tetrasiklin 1000 ppm dan kontrol negatif aquades. Penentuan konsentrasi hambat tumbuh minimum menggunakan konsentrasi 1000 ppm, 500 ppm, 250 ppm, 125 ppm, 65 ppm, 30 ppm, 15 ppm, 10 ppm, 5 ppm. Ekstraksi daun mangga bacang menunjukan rendemen sebesar 10,61% (b/b) dan diameter zona hambat aktivitas antibakteri konsentrasi 1000 ppm sebesar 5,46 mm. KHTM ekstrak metanol daun mangga bacang terhadap E. aerogenes yaitu pada konsentrasi 5 ppm dengan diameter zona hambat sebesar 1,78 mm. Berdasarkan hasil uji fitokimia ekstrak metanol daun mangga bacang menunjukkan adanya senyawa golongan alkaloid, flavonoid, stereoid, polifenol, tanin, dan saponin. Abstract Enterobacter aerogenes is causes various bacterium infections. One of the treatment of various infectious diseases is by antibiotics treatment. The long-term use of synthetic antibiotics causes antibiotic resistance, so that research exploration of new antibiotic is needed, such as plant extracts potentially as an antibacterial, one of them is leaves extract of mango bacang (Mangifera foetida L.). This study aimed to examine the potential of leaves mango bacang extract as an antibacterial againts E. aerogenes, the determination of minimum inhibition concentration (MIC) and active compounds of leaves mango bacang extract. Leaves mango bacang extract obtained methanol maceration. The extract obtained was tested antibacterial activity by using the diffusion wells method. Concentration used was 1000 ppm, tetracycline of 1000 ppm as positif control and aquades as negative control. The determination of MIC was used various concentrations of 1000 ppm, 500 ppm, 250 ppm, 125 ppm, 65 ppm, 30 ppm, 15 ppm, 10 ppm, and 5 ppm. The extraction mango bacang leaves with yielded 10.61 % (b/b) and diameter of zone of the antibacterial activity extract of 1000 ppm was 5.46 mm. The MIC of the methanol extract against E. aerogenes was 5 ppm with the zone diameter of 1.78 mm. Phytochemistry analysis of mango bacang leaves extract using methanol result the alkaloid, flavonoid, stereoid, catakin, tannin, and saponin.

Theoretical study of structure and electronic spectra of a [Ln(pytpy)(NO3)3] complex by quantum Sparkle/RM1 method. Theoretical study of structure and electronic spectra of [Ln(pytpy)(NO3)3] complex (Ln=Eu, Tb, pytpy=4’-(2-pyrrolyl)-2,2’:6’,2”-terpyridine) has been conducted using quantum semiempirical Sparkle/RM1 method. The Sparkle/RM1 method could be used to get the geometry structure of molecule that more stable and structure parameter in the gas phase as simulation of experiment method which too expensive. The calculation of the electronic specra using ZINDO/S method, the sparke is replaced by a point charge +3 along in the positions as determined by Sparkle/RM1 method. Optimized geometri showed that in the complexe [Ln(pytpy)(NO3)3], lanthanide ion is 9-coordinate, being bonded to one tridentate pytpy ligand and three bidentate nitrates.Average distance between lanthanide ion with the N of pytpy ligand is 2,541 Å and 5,14 Å for Eu3+ and Tb3+ respectively. The result of spectroscopic study showed that Sparkle/RM1 method can lead to reliable IR spectra prediction of the ligand and the complexes. UV-Vis spectra of the ligand and the complexes has more intense absorbance and displaying a red shift than UV-Vis spectra of free ligand

Fly ash is an ash with smooth granular shape and black grey color. It is a waste material produced from the burning of coal. The contain of fly ash especially is silica and alumina that it can be used as adsorbent. As adsorbent, fly ash as used to decrease water hardness at Darmakradenan Village, Ajibarang District. The result showed that the porosity of fly ash was 13.6056%, the water content was 0.055%, adsorption capacity of iodium was 216.8975 mg/g, and adsorption capacity of methylen blue was 0,3891 mg/g. Fly ash could decrease total water hardness. The adsorption rise when contact time was added. Adsorption reached equilibrium at contact time 120 minutes with decreasion percentage 63.6363%.

A research on the synthesis of sodium pentagamavunonat (Na-PGV-0) and its stability test using UV-Visible spectrophotometer were carried out. The synthesis of Na-PGV-0 carried out by reacting PGV-0 in tetrahydrofuran solvent refluxed with sodium ethoxide in mol comparison (1:2) for two hours. Structure elucidation by spectroscopic methods using UV-Visible, IR, 1H-NMR, 13C-NMR and stability test in water using UV-Visible spectrophotometer. The reaction yields 107,21 % (% w/w) products. A products was soluble in water and methanol. Structure elucidation results indicated that the formed compound where the OH phenolic of pentagamavunon-0 was replaced by sodium ions. Stability test shows that decreasing of sodium pentagamavunonat to 70,7867 % in 600 minutes storage.