EFFECT OF ZINC OXIDE NANOPARTICLES ON THE THERMAL, MECHANICAL AND WATER ABSORPTION PROPERTIES OF POLYLACTIC ACID/CHITOSAN COMPOSITES

The aim of this work is to improve the mechanical, thermal and water absorption properties of PLCHZ composites. The formation of the composites are mixing polylactic acid with zinc oxide nanoparticles (ZnO) and chitosan as filler. It produced through the precipitation method using a water bath under a temperature of 60 oC. Five prepared samples are pure PLA, PLCH, PLCHZa, PLCHZb and PLCHZc. The incorporating effect of fillers on the properties of samples is investigated in terms of mechanical, thermal and water absorbtion test. The result showed that mechanical and thermal properties increased with the addition of ZnO nanoparticles compared to pure PLA and PLCH. Nevertheless, those properties increased up to 2 wt% of ZnO nanoparticles loading but decreased when it content is increased up to 3 wt% and 4 wt%. PLCHZa with the smallest content of 2 wt% ZnO nanoparticles showed the highest value of 15 MPa in tensile strength and 330.6 oC in thermal resistant. In water absorbtion test, PLCHZc with 4 wt% ZnO has better absorb ability as well as the lowest percentage absorption rate of 0.02% to 0.03%. It can be conclude that ZnO nanoparticles play an important role in the main properties of polymer composites.

Synthesis, in silico studies and antibacterial activity of some novel 2-substituted benzimidazole derivatives

Background The o-phenylenediamine is a versatile starting material for several compounds. Synthesized o-phenylenediamine and amino acids (glycine, alanine, aspartic acid, and l-proline) undergo condensation via Phillips reaction. The synthesized compound showed the promising antibacterial activity of Bacillus subtilis and Pseudomonas aeruginosa at the concentration of 100, 50, 25, 12.5, 6.25, 3.12, 1.6, 0.8, 0.4, and 0.2 μg/ml. Ciprofloxacin was used as standard drug. Synthesis of benzimidazole derivatives was carried out and purified by recrystallization process using ethanol. Substituted derivatives were characterized by melting point, TLC and spectroscopic methods include FT-IR and 1H-NMR. Results In silico studies were adopted for synthetic derivatives by Molinspiration, ChemDraw, and online software tool. Minimum inhibitory concentration (MIC) values of B. subtilis and P. aeruginosa were reported, and benzimidazole ligands and Molinspiration scores were generated and listed. Conclusion The more negative values indicate a higher binding affinity. The generated ligand observations can be visualized. Physical constants of synthesized derivates such as solubility and melting point were determined. Bioactivity scores were noted for different derivatives and predicted percentage absorption in the gut. The antibacterial activity was performed using the MIC method (aerobic).

Pemanfaatan Limbah Galvalum Sebagai Substitusi Aggregat Kasar Pada Jobmix Beton

Concrete is one of the construction materials that is widely used. Currently, variations in concrete are being studied. Galvalum waste has high tensile properties but is mild. Its lightweight properties are expected to reduce the weight of the concrete itself. The purpose of this study is to find out the value of strong press, absorption, weight type (E), degree of saturation (Sr), moisture content (Wc), and porosity of the addition of galvalume waste. The method used is a experimental method. Variations in galvalum waste substitution used are 50% and 100% of the aggregate weight is roughT the sample used in the form of a cylinder size of 15cm x 30 cm with the initial quality of fc' 18.67 Mpa. The results of the strong press test showed that the galvalum waste subtitution has not been able to exceed the initial quality of the plan. The highest test result was obtained at a percentage of 50% with a strong press score of FC' 17.94 Mpa. In the percentage, absorption test results are 0.010%, the weight of the type is 2325 kg / m3, the pore number is 0.00232%, the water content is 0.108%, and porosity is 0.00108%.Beton merupakan salah satu bahan konstruksi yang banyak dipergunakan. Saat ini, pengguanaan variasi pada beton sedang banyak diteliti. Limbah galvalum memiliki sifat tarik yang tinggi namun ringan. Sifatnya yang ringan diharapkan mampu mengurangi berat beton itu sendiri. Tujuan dari penelitian ini adalah untuk mengetahui nilai kuat tekan, absorpsi, berat jenis (Ɣ), angka pori (e),derajat kejenuhan (Sr), kadar air (Wc), dan porositas dari penambahan limbah galvalum. Metode yang digunakan merupakan metode eksperimen. Variasi pensubtitusi limbah galvalum yang digunakan yaitu 50% dan 100% dari berat agregat kasar. sampel yang digunakan berbentuk silinder ukuran 15cm x 30 cm dengan mutu awal fc’ 18.67 Mpa. Hasil uji kuat tekan menunjukkan bahwa subtitusi limbah galvalum belum mampu melebihi mutu awal rencana. Hasil uji tertinggi didapat pada prosentase 50% dengan nilai kuat tekan fc’ 17,94 Mpa. Pada prosentase tersebut, didapat hasil uji absropsi yaitu 0,010%, berat jenis yaitu 2325 kg/m3, angka pori yaitu 0,00232%, kadar air yaitu 0,108% serta porositas yaitu 0,00108%.

QUANTITATIVE PHYTOCHEMICAL SCREENING AND TERMICIDAL ACTIVITIES OF EUPHORBIA TIRUCALLI L. EXTRACTS ON DANIELLIA OLIVERI (ROLFE) HUTCH. AND DALZIEL AND FICUS CAPENSIS THUNB. WOODS

This study investigated effect of Euphorbia tirucalli extracts on Daniellia oliveri and Ficus capensis woods. Wood samples were purchased and processed into 10 cm x 2 cm x 2 cm dimensions, while plant parts collected were oven dried before extraction. E. tirucalli was screened for phytochemicals. Concentrations of 0.5%, 1% and 2% extracts were prepared by serial dilution. Soligum, methanol and untreated wood samples were used as control. Treated wood samples were laid within 6 x 12 metres field at 1 x 3 metres spacing in a Completely Randomized Design (CRD) in a termitarium and data were taken within 8 weeks. Phytochemical results indicated the presence of alkaloids, phenols, tannins, cardiac glycosides, flavonoids and saponins. Percentage absorption of extracts ranged from 47 - 86 % and 94.00 - 50.67 % in D. oliveri and F. capensis, respectively. Percentage retention of extracts ranged from 10.84 - 2.14 kg/m3 and 11.62 - 7.01 kg/m3 in D. oliveri and F. capensis. Soligum treated wood samples were not attacked throughout the period of study. D. oliveri and F. capensis woods treated with 0.5% E. tirucalli methanol extract were not attached on till the 6th and 8th week respectively. The least percentage weight loss of 5.49 % and 28.32 % were recorded for D. oliveri and F. capensis woods treated with soligum, while, 27.5 5 % and 52.50 % weight loss were recorded for F. capensis and D. oliveri woods treated with 0.5% methanol extract. It was concluded that the use o

Antifungal Effectiveness of Pyrolytic Oil Obtained from Triplochiton scleroxylon (De. Wild) Sawdust on Selected Wood Species

The present study was carried out to investigate the effectiveness of pyrolytic oil obtained from Triplochion scleroxylon sawdust which used as a preservative against fungi attack on Alstonia bonnei, Ceiba pentandra, Pterocarpus osun, Terminalia randii, Triplochiton scleroxylon wood. The wood samples used for the experiment were dimensioned into 20 x 20 x 60 mm and soaked for 72 hours to obtain appreciable absorption. The percentage absorption after soaking and weight loss after exposure to termite were determined. Data were analyzed using simple statistics and analysis of variance at α0.05. The highest and lowest percentage absorption was recorded for Terminalia randii and Alstonia bonnie with 23.20 % and 13.10 % respectively. Analysis of variance result indicates the significant difference in wood species used. The result obtained for weight loss revealed significant differences in wood species as well as in fungi also. The result further showed that those are taken as control recorded the highest weight loss to white and brown rot fungi. Pyrolytic oil possesses a great potential in the prevention of fungi attack as it contained phenolic compound.

Dynamics of blood lipid-phospholipid profile indicators in elderiy patients with stroke

Objective. To study dynamics of blood lipid-phospholipid profile indicators in elderly patients with stroke for criteria optimization of differential diagnosis, treatment and prognosis.Material and methods. Sixty patients, aged from 60 to 74 years with new-onset hemispheric stroke were examined. 34 patients of them were diagnosed with ischemic stroke (IS); 26 patients had intracerebral hemorrhage (ICH). Patient’s status was assessed using the NIHSS, the Rivermead mobility index, the modified Renkin scale, the Barthel ADL index. We measured blood levels of phosphotidylinosits in patients with acute IS and ICH. The percentage absorption of lipid-phospholipid complexes was also studied in the infrared spectrum of blood serum. The control group consisted of 20 healthy individuals.Results. Dynamics of lipid-phospholipid complexes in blood serum is associated with the type of stroke. The blood levels of phosphotidylinosits in patients with acute IS and ICH were strongly correlated with degree of neurological deficit, levels of daily activity and functional independence (p < 0,05–0,01).Conclusion. The received data may be important for individualization of diagnostics and therapeutic interventions in elderly patients with acute IS and ICH.

Pemanfaatan Karbon Aktif Dari Limbah Kulit Pisang Goroho (Musa acuminafe) Sebagai Adsorben Zat Pewarna Tekstil Methylene Blue

Penelitian ini bertujuan untuk membuat karbon aktif kulit pisang Goroho yang teraktivasi H2SO4 dan NaOH yang mampu menyerap zat warna Methylene Bluedan menentukan jenis aktivator, waktu kontak dan massa optimumnya. Karbon aktif kulit pisang Goroho dibuat dengan mengkarbonisasi kulit pisang Goroho kering yang diaktivasi dengan H2SO4 dan NaOH. Jenis aktivator, waktu kontak dan massa optimumnya ditentukan berdasarkan persentase penyerapan Methylene Blue tertinggi. Hasil penelitian menunjukan persentase penyerapan tertinggi pada massa 0,10 gram dan waktu kontak 90 menit. Persentase penyerapan zat pewarna Methylene Blue oleh karbon aktif kulit pisang Goroho yang teraktivasi H2SO4 yang diperoleh lebih tinggi dibandingkan karbon aktif kulit pisang Goroho yang teraktivasi NaOH.This study is intended to make activated banana activated Goroho banana peels H2SO4 and NaOH capable of absorbing Methylene Blue dyes and determine the type of activator, contact time and optimum mass. The Goroho banana bark activated carbons are made by carbonizing the skin of dried Goroho bananas that are activated with H2SO4 and NaOH. The type of activator, contact time and optimum mass are determined by the highest percentage of Methylene Blue absorption. The results showed the highest absorption percentage at mass of 0.10 gram and contact time 90 minutes. Percentage absorption of methylene blue dye by Activated H2SO4 Goroho activated banana peel activated carbon from activated NaOH activated NaOH activated Goroho banana skin.

Tembaga (Cu) Menurunkan Kandungan Pigmen dan Pertumbuhan Mikroalga Merah, Porphyridium cruentum (Effect of Copper on Pigments Content and Growth of Red Microalgae, Porphyridium cruentum)

Logam berat tembaga (Cu) merupakan salah satu pencemar yang paling mengkhawatirkan di wilayah pesisir dan lautan. Berbagai metode telah banyak dikembangkan untuk mengatasi dan mengurangi pencemaran logam berat, baik secara fisika, kimia dan biologi. Masalah teknis dan biaya yang mahal menyebabkan manusia menggunakan cara biologis (bioremediasi). Salah satu diantaranya menggunakan mikroalga Porphyridium cruentum. Penelitian bertujuan untuk mengetahui pengaruh tingkat konsentrasi logam berat Cu terhadap kandungan klorofil, pigmen fikobiliprotein dan pertumbuhan mikroalga P. cruentum. Bibit mikroalga diperoleh dari Balai Besar Pengembangan Budidaya Air Payau Situbondo. Rancangan penelitian menggunakan metode eksperimental laboratorium. Konsentrasi logam berat Cu yang digunakan adalah 0 ppm sebagai kontrol, 1, 2, 3 dan 4 ppm. Logam berat Cu dianalisa menggunakan AAS dan pigmen (klorofil dan fikobiliprotein) menggunakan spektrofotometri UV-Vis.Hasil yang didapat menunjukkan bahwa logam berat Cu dengan konsentrasi yang berbeda memberikan pengaruh yang sangat nyata (P<0,01) terhadap kandungan pigmen (klorofil dan fikobiliprotein), BCF dan pengaruh nyata (P<0,05) terhadap laju pertumbuhan P. cruentum. Semakin tinggi logam berat Cu membuat laju pertumbuhan, kandungan pigmen (klorofil dan fikobiliprotein), dan BCF pada P. cruentum semakin menurun. Prosentase penyerapan logam berat Cu tertinggi sebesar 13,1 % (1 ppm), 8,2 % (2 ppm), 6,9 % (3 ppm), dan 2,6% (4 ppm). Hasil penelitian ini menunjukkan bahwa P. cruentum berpotensi sebagai bioremediator. Kata kunci: Porphyridium cruentum; pigmen; klorofil; fikobiliprotein; pertumbuhan; tembaga Copper (Cu) is one of heavy metals and the most pollutant at seawater ecosystem. Various methods have been developed to reduce heavy metal pollution with in physics, chemistry and biology method. Technical problems and high costs cause human use biological method (bioremediation). One of them used microalgae Porphyridium cruentum.This study aims to find out the influence of copper exposure levels on chlorophyll, pigment Phycobiliproteins, and the growth of microalgae Porphyridium cruentum. P. cruentum stock was collected from Main Center Brackish Water Aquaculture Development, Situbondo. The research design this study used a experimental laboratory. Concentrations of heavy metals Cu used are 0 ppm as control, 1 ppm, 2 ppm, 3 ppm, and 4 ppm. Heavy metals Cu analysised by AAS and measurent pigments (chlorophyll and phycobiliproteins) performed by spectrometric UV-Vis. The results showed that heavy metals Cu with different concentrations give a very effect influence (P<0.01) to pigment (chlorophyll and phycobiliproteins) content, BCF, and effect influence (P<0.05) to growth. The high Cu resulted decrease to growth of microalgae, cell density, pigments (chlorophyll and phycobiliproteins), and bio concentration factor Porphyridium cruentum. The highly percentage absorption of heavy metals Cu at 13.1% (1 ppm), 8.2% (2 ppm), 6.9% (3 ppm), and 2.6% (4 ppm). The results suggest that P. cruentum has the potential as bioremediator. Keywords: Porphyridium cruentum; chlorophyll; phycobiliproteins; growth; copper

Assessing the Rate of Remediation of Polycyclic Aromatic Hydrocarbon Contaminated Soil Using Redox Parameters

This paper investigates the use of redox parameters as a measure of the environmental impact assessment of soil contaminated with polycyclic aromatic hydrocarbons. The levels of naphthalene and anthracene which were used as model contaminants in the soil were periodically monitored along with ferric sulphate and nitrate at ambient conditions. The Brucine and Gelatin Barium methods were employed in estimating the nitrate and sulphate reductions. Experimental results revealed that the microbial utilization of nitrate was faster than that of sulphate; an indication that nitrate is the basic nutrient which provides nitrogen for the metabolic processes occurring during soil remediation. The percentage absorption for both nitrate and sulphate was comparatively higher for the soil unimpacted with polycyclic aromatic hydrocarbons, approximately 49.3% and 26.12% respectively. The percentage absorption of nitrate and sulphate for soil spiked independently with naphthalene and anthracene was found to be 42.18%; 31.21% and 22.93%; 19.74% respectively. The percentage reduction of naphthalene and anthracene in the nitrate and sulphate enhanced soil was 47.5%; 43.1% and 42.5%; 36.5% respectively. These results further affirm that the higher the molecular weight of the polycyclic aromatic hydrocarbon, the slower the rate of its degradation.