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All Journal The Journal of Pure and Applied Chemistry Research Profesi Pendidikan Dasar
Heru Setyawan
STMIK JAKARTA STI&K
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Other

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EFEKTIVITAS MATA KULIAH BAHASA INGGRIS DI PGSD TERHADAP KEYAKINAN DAN MOTIVASI MAHASISWA DALAM MENGAJAR BAHASA INGGRIS SDHonest Honest Ummi Kaltsum; Heru Setyawan; Dika Adi Krisnawan
Profesi Pendidikan Dasar Vol. 2, No. 1, Juli 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/ppd.v2i1.1543

Abstract

This research aims to investigate the effectiveness of four English courses at PGSD FKIPUMS towards the belief and motivation of the PGSD students to teach English to primarystudents. From the 130 questioners distributed, 130 are also returned, and the workingquestioners are just 125. Based on the results of the descriptive analysis shows that thosefour courses have been effective (mean statistic above 3 and mode 4). While the variablemode of beliefs have mean values above 3 and largely mode 3. These results indicate thatthe respondents have confi dence in moderate level to teach English to their students. Studentresponses regarding motivation in teaching English showed that students have the motivationin teaching English, but the motivation is on moderate level. This is showed by the mean scoreswhich is above 3 and most of the modes is 3. The results of the descriptive analysis showedthat students still require the need for additional training to teach English to prospectivestudents. These results indicated by the mean score of 4 and mode 4. From this data, it can beseen that the students needs an additional training to make them ready teaching English toChildren. The conclusion is the program of four English courses has been effective, howeverthe students is in the moderate level of belief and motivation to teach English to primarystudents, therefore the additional English course training for those students is needed.
Enhancing Cellulose-Gelatin Film Properties for Wound Dressings Application: The Role of Ultrasonic-Assisted Pretreatment Shafira Nur Adiningsih; Sekar Tri Wulan Amelia; Ni Made Intan Putri Suari; Heru Setyawan; Widiyastuti, Widiyastuti; Nurtono, Tantular
The Journal of Pure and Applied Chemistry Research Vol. 15 No. 1 (2026): Edition January-April 2026
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2026.015.01.7954

Abstract

This study aims to enhance the cellulose-gelatin film properties using ultrasonic-assisted pretreatment for wound dressing applications. The film is made from cellulose isolated from avocado seed waste, composited with gelatin, and applied citric acid as a crosslinker and antimicrobial agent. The main factor that affects the performance of cellulose in films was dispersion of cellulose within the composite material. To improve cellulose dispersion, cellulose was pretreated using ultrasonic-assisted methods, its effects on film’s properties were investigated and compared with no ultrasonic pretreated cellulose. Scanning electron microscopy revealed more even dispersion in ultrasonic pretreated samples, further confirmed by their chemical bonds analysis. These improvements significantly enhanced the mechanical properties of the composite film, increasing the tensile strength from 0.099 MPa to 0.988 MPa and the percent elongation from 77 % to 106 %. Moreover, films with ultrasonic pretreated cellulose exhibited resilient swelling behavior, indicating better resilience in aqueous environment. Additionally, films revealed antibacterial activity against gram-positive and gram-negative bacteria, which has inhibition zone against Escherichia coli for CF-nSON and CF-SON are 39 mm and 35, mm respectively. As the inhibition zone against Staphylococcus auerus for CF-nSON and CF-SON are 33 mm and 26.3 mm, respectively. These results are pointing out their performance as wound dressing.
Co-Authors Dika Adi Krisnawan Honest Ummi Kaltsum Ni Made Intan Putri Suari Sekar Tri Wulan Amelia Shafira Nur Adiningsih Tantular Nurtono Widiyastuti Widiyastuti