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INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 27, No 2 (2022)" : 6 Documents clear
PEMANFAATAN AMPAS DAUN TEH PADA PROSES BIOSORPSI LOGAM BERAT Cr(VI) PADA AIR SUNGAI CITARUM Suci Rizki Nurul Aeni; Farhan Baehaki; Syifa Zayna Muwahiddah
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.52841

Abstract

Limbah Cr(VI) dapat mengganggu kesehatan karena bersifat toksik, maka perlu dilakukan pengolahan air sungai terlebih dahulu. Salah satu Teknik pengolahan alternatif yaitu menggunakan metode biosorpsi dengan biosorben ampas daun teh. Namun hasil penyerapan itu tergantung oleh beberapa faktor salah satunya yaitu waktu kontak. Tujuan penelitian ini untuk mengetahui waktu kontak optimum terhadap proses biosorpsi Cr(VI) dengan menggunakan biosorben ampas daun teh. Penelitian ini menggunakan metode deskriptif kuantitatif. Sampel yang digunakan air Sungai Citarum yang diambil dari empat titik yaitu di Desa Pangauban, Desa Cilampeni, Desa Nanjung dan Desa Lagadar. Pengukuran kadar dilakukan menggunakan Spektrofotometer UV-Vis pada panjang gelombang 540 nm. Berdasarkan penelitian ini diperoleh waktu kontak optimum yaitu 45 menit dengan presentase penurunan kadar dari masing-masing sampel yaitu 73,25% (Desa Pangauban), 75,94% (Desa Cilampeni), 71,88%, (Desa Nanjung) dan 74,31% (Desa Lagadar). Oleh karena itu, waktu kontak merupakan faktor yang perlu diperhatikan dalam proses biosorpsi untuk pengolahan limbah logam berat Cr(VI). Pemanfaatan ampas daun teh pada proses biosorpsi logam berat Cr(VI) pada air sungai CitarumCr(VI) waste can interfere with health because it is toxic, so it is necessary to treat river water first. One alternative treatment is using the biosorption method with tea leaf dregs biosorbent. However, the absorption results depend on several factors, one of which is contact time. The purpose of this study was to determine the optimum contact time for the biosorption process of Cr(VI) using tea leaf dregs biosorbent. This study used a quantitative descriptive method. The samples used were Citarum River water taken from four points, namely in Pangauban Village, Cilampeni Village, Nanjung Village and Lagadar Village. The concentration measurement was carried out using a UV-Vis Spectrophotometer at a wavelength of 540 nm. Based on this study, the optimum contact time was 45 minutes with the percentage reduction in levels of each sample, namely 73.25% (Pangauban Village), 75.94% (Cilapeni Village), 71.88%, (Nanjung Village) and 74, 31% (Lagadar Village). Therefore, contact time is a factor that needs to be considered in the biosorption process for the treatment of Cr(VI) heavy metal waste
Identifikasi Jamur Trichophyton sp. Penyebab Tinea Unguium Pada Petani Desa Mekarluyu Kabupaten Garut Firdha Rachmawati; Perdina Nursidika; Putri Fitrianingsih
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.52528

Abstract

Infeksi jamur menyerang lebih dari 6 juta penduduk Indonesia setiap tahunnya. Tinea unguium merupakan infeksi mikosis superfisialis dengan insidensi 30% dan merupakan penyebab 50% kelainan kuku. Desa Mekarluyu Kabupaten Garut merupakan daerah dengan mayoritas penduduk bekerja sebagai petani. Keadaan lingkungan kerja yang basah, lembab dan suhu yang hangat meningkatkan risiko penyakit Tinea unguium pada petani. Tinea unguium disebabkan oleh jamur dermatofita dengan penyebab utama yaitu jamur Trichophyton sp. Oleh karena itu, penelitian ini bertujuan untuk mengidentifikasi Trichophyton sp. penyebab tinea unguium pada kuku kaki petani Desa Mekarluyu Kabupaten Garut. Penelitian ini menggunakan metode cross-sectional dengan responden sebanyak 30 orang yang diketahui menunjukkan gejala Tinea unguium. Sampel kerokan kuku yang telah diambil kemudian ditumbuhkan pada media Saboraud Dextrose agar untuk diamati koloninya. Pengamatan mikroskopis hasil biakan dilakukan dengan pewarnaan Lactophenol Cotton Blue. Hasil penelitian didapatkan sebanyak 23% responden terinfeksi oleh Trichophyton sp. dengan spesies yang ditemukan yaitu Trichophyton rubrum 17% dan Trichophyton mentagrophytes (6%).Identification of fungi causing Tinea Unguium Trichophyton sp. on farmers in Mekarluyu Village Garut RegencyMore than 6 million Indonesian people were infected by fungi every year. Tinea unguium is a superficial mycosis infection with an incidence 30% and 50% main causes of nail disorders. Mekarluyu Village, Garut Regency is an area with the majority of the population working as farmers. Wet, humid and warm temperatures working conditions increase the risk of tinea unguium in farmers. Main aetiology of tinea unguium is Trichophyton sp. Therefore, this study aims to identify Trichophyton sp. the cause of tinea unguium on the toenails of farmers in Mekarluyu Village, Garut Regency. This study used a cross-sectional method with 30 respondents who were known to show symptoms of tinea unguium. The nail scraping samples were grown on Saboraud Dextrose Agar media to observe the colonies. Microscopic observations of the colonies were carried out with Lactophenol Cotton Blue staining. The results showed that 23% of respondents were infected by Trichophyton sp. with the species Trichophyton rubrum 17% and Trichophyton mentagrophytes (6%).
ANTIBACTERIAL ACTIVITIES OF POLAR FRACTION OF PAPAYA LEAF ETHANOLIC EXTRACT (Carica papaya Linn.) AGAINST Escherichia coli AND Staphylococcus aureus Margaretha Kurniasari; Kurnia Rahayu Purnomo Sari; Nur'aini Purnamaningsih
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.53006

Abstract

Tujuan penelitian untuk mengetahui aktivitas antibakteri fraksi polar ekstrak etanol daun pepaya (Carica papaya L.) terhadap bakteri Staphylococcus aureus dan Escherichia coli. Proses ekstraksi dilakukan menggunakan metode maserasi dengan pelarut etanol 70%. Ekstrak etanol selanjutnya difraksinasi menggunakan pelarut etanol-air. Uji aktivitas antibakteri yang digunakan adalah metode difusi agar cara Kirby Bauer. Variasi konsentrasi fraksi etanol-air ekstrak etanol daun pepaya 10, 15, 20, 25, 30, dan 100%. Zona hambat pertumbuhan bakteri Staphylococcus aureus dan Escherichia coli diukur menggunakan jangka sorong. Hasil penelitian menunjukkan zona hambat fraksi etanol-air terhadap bakteri Staphylococcus aureus yang paling optimum yaitu pada konsentrasi 100% sebesar 14,75 mm; sedangkan pada bakteri Escherichia coli yang paling optimum yaitu pada konsentrasi 100% sebesar 11,53 mm. Namun tidak efektif jika dibandingkan dengan zona hambat kontrol positif kloramfenikol. Kesimpulan fraksi etanol-air ekstrak etanol daun pepaya (Carica papaya L.) dapat menghambat pertumbuhan bakteri Staphylococcus aureus dan Escherichia coli.Antibacterial activities of polar fraction of papaya leaf ethanolic extract (Carica papaya Linn.) against Escherichia coli and Staphylococcus aureusThis study aimed to determine the antibacterial activities polar fraction of papaya leaf ethanol extract against Escherichia coli and Staphylococcus aureus. Simplicia was extracted by ethanol 70% with the maceration method. Ethanolic extract was fractionated with ethanol water. Kirby Bauer diffusion method agar was used for antibacterial activities. Variation concentration of the ethanol-water fraction of papaya leaf ethanolic extract 10, 15, 20, 25, 30, and 100%. The growth inhibition zones of Escherichia coli and Staphylococcus aureus are measured using a caliper. The zone of inhibition of the ethanol-water fraction against Staphylococcus aureus was the most optimum at a concentration of 100% at 14.75 mm, while the most optimum for Escherichia coli was at a concentration of 100% at 11.53 mm, but did not effective than positive control Chloramphenicol. The conclusion of this study is that the ethanol-water fraction of papaya leaf ethanol extract could inhibit the growth of Staphylococcus aureus and Escherichia coli bacteria.
Analysis of CVT (continuously variable transmission) and the influence of variations on the motorcycle Rinasa Agistya Anugrah
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.53582

Abstract

This study was aimed to determine the working principle, troubleshooting, and the influence of CVT roller weight variations on Suzuki Nex-FI 2014 motorcycles. This research was conducted by analyzing and comparing the measurement results for each CVT component. This study used an experimental research by holding the throttle at 3,250 rpm. Once steady state is reached, the throttle is rotated up to 10,000 rpm. The results of the troubleshooting analysis and measurement of drive belt wear were from the standard size of 19.50 mm to 18.00 mm. The usage tolerance limit is 18.60 mm. As for the results of the roller variation test using a lighter weight namely 8 and 9 grams. The results show that the maximum results are achieved at low and medium rotational speeds, compared to the use of 11 gr (standard) roller. The weakness of the lighter roller (8 9 grams) is that they only get good acceleration and torque at low revs while at high rotation speed is less than the maximum. The use of standard (11 gram) roller has less maximum acceleration and torque but produces maximum power.
IDENTIFIKASI Escherichia coli PADA AIR MINUM ISI ULANG Nunung Sulistyani; Vera Millania
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.52224

Abstract

Air memiliki peran penting bagi setiap makhluk hidup untuk memenuhi kebutuhan esensial. Asupan cairan dalam hal ini air minum menjadi sangat penting bagi tubuh manusia, maka perlu diperhatikan kualitas air minum sesuai standar yang telah ditetapkan. Saat ini, banyak penyelenggara air minum isi ulang mendapatkan ijin operasi untuk memproduksi air minum bagi masyarakat. Untuk menjaga kualitas air minum yang dikonsumsi masyarakat, dilakukan pengawasan secara berkala baik secara internal maupun eksternal. Penelitian ini bertujuan untuk mengidentifikasi adanya bakteri Escherichia coli pada salah satu merek air minum isi ulang yang berada di Yogyakarta yang bernama Khaira. Uji mikrobiologis dilakukan dalam penelitian ini. Data diperoleh melalui pemeriksaan air isi ulang menggunakan metode Most Probable Number (MPN). Hasil uji MPN menunjukkan tidak terdeteksi Escherichia coli pada semua sampel air. Kualitas air minum isi ulang yang diproduksi “Khaira” Yogyakarta berdasarkan uji identifikasi Escherichia coli memenuhi persyaratan batas cemaran mikroba.The identification of escherichia coli contains in ”Khaira” Yogyakarta refill waterWater has an important role for every living thing to meet essential needs. Fluid intake, in this case drinking water, is very important for the human body, so it is necessary to pay attention to the quality of drinking water according to established standards. Currently, many refill drinking water providers have obtained operating licenses to produce drinking water for the community. To maintain the quality of drinking water consumed by the community, periodic monitoring is carried out both internally and externally. This study was aimed to identify the Escherichia coli contains in one of the refill waters in Yogyakarta namely, Khaira. The microbiological test was used in this study. This research was conducted by identifying Escherichia coli in refill drinking water. The data was obtained by checking the refill water using the Most Probable Number (MPN) method. The MPN test results showed no Escherichia coli was detected in all water samples. The quality of refill drinking water produced by “Khaira” Yogyakarta based on the Escherichia coli identification test meets the requirements for microbial contamination limits.  
Kajian Struktur Bawah Tanah Berdasarkan Parameter Mikroseismik di Kota Lama Semarang Ilqia Rahma; Desi Mustami’ Limayukha; Muthiah Afifah; Wahyu Humam Muttaqin; Supriyadi Supriyadi
Jurnal Penelitian Saintek Vol 27, No 2 (2022)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v2i27.53059

Abstract

Salah satu objek wisata sejarah yang terkenal di Semarang adalah Kota Lama. Kota Lama Semarang memiliki detail luas kawasan sebesar +- 31,24 Hektar dan berlokasi di Desa Bandarharjo, Semarang Utara. Penelitian ini bertujuan untuk melakukan kajian struktur bawah tanah berdasarkan parameter mikroseismik dengan menggunakan alat Seismometer M. A. E tipe S3S yang dilengkapi dengan Vibralog dan kabel fiber optik. Analisis mikrotremor dapat dilakukan dengan metode HVSR. Dalam menganalisis data mikrotremor dengan metode HVSR dibantu dengan menggunakan software Geopsy. Hasil penelitian memperlihatkan rentang nilai frekuensi natural yang relatif bervariasi dan berada pada kisaran antara 5.5-18 Hz. Nilai amplifikasi dalam kisaran antara 0,2-0,86 dengan besar distribusi faktor amplifikasi dominan rendah. Nilai indeks kerentanan seismik di daerah tersebut tergolong kategori rendah dengan rentang 0,004-0,058 s2/cm. Daerah kota lama memiliki nilai PGA berkisar 38-71 gal dengan tingkat resiko rendah hingga sedang. Rentang nilai Ground Shear Strain pada Kota Lama Semarang berkisar antara 0,0005-0,0018 termasuk dalam kategori sifat dinamika tanah berupa elastoplastisitas.Study of underground structures based on microseismic parameters in Kota Lama SemarangOne of the famous historical attractions in Semarang is Kota Lama. Kota Lama is +- 31.24 hectares and located in Bandarharjo Village, North Semarang. This study was aimed to determine the underground structures based on microseismic parameters using an M.A.E Seismometer type S3S equipped with Vibralog and fiber optic cables. Microtremor analysis was conducted using the HVSR method. In analyzing the microtremor data with the HVSR method, Geopsy software was used. The results show that the range of dominant frequency values is relatively varied and is in the range between 5.5-18 Hz. The amplification value is in the range between 0.2 and 0.86 with a low dominant amplification factor distribution. The value of the seismic vulnerability index in the area is classified as low category with a range of 0.004-0.058 s2/cm. Kota Lama has a PGA value ranging from 38-71 gal with a low to moderate risk level. The range of Ground Shear Strain values in Kota Lama Semarang ranges from 0.0005-0.0018 which is included in the category of soil dynamics in the form of elastoplasticity

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