JURNAL ILMIAH SAINS最新文献

{"title":"Perkembangan Awal Larva Ikan Mas (Cyprinus carpio L) dari Induk yang Diberi Pakan dengan Penambahan Kurkumin","authors":"L. D. Rawung, Jacson Saruan, D. J. Rayer, E. M. Moko","doi":"10.35799/jis.v21i2.35338","DOIUrl":"https://doi.org/10.35799/jis.v21i2.35338","url":null,"abstract":"Perkembangan awal larva sangat dipengaruhi oleh ketersediaan makanan yang berasal dari kantung telurnya. Tidak terpenuhi nutrisi pada masa awal perkembangan dapat mempengaruhi perkembangan larva. Tujuan penelitian ini adalah untuk mengukur diameter telur hasil pemijahan  dan panjang badan pada awal perkembangan larva ikan mas dari induk yang diberi pakan dengan penambahan kurkumin. Penelitian ini menggunakan induk betina ikan mas yang diberikan suplementasi kurkumin pada beberapa dosis yaitu 0%; 0,25%; 0,5%; 1%; dan 2%.  Ikan yang telah matang gonad kemudian dipijahkan. Telur yang telah terbuahi kemudian diambil untuk ditetaskan dan diamati perkembangan larvanya selama 2 hari setelah penetasan (hsp). Hasil pengamatan menunjukkan bahwa perlakuan suplementasi kurkumin dengan dosis 0,5% yang diberikan dalam pakan induk betina ikan mas memberikan nilai yang optimal terhadap diameter telur hasil pemijahan (p<0,05) dan panjang badan larva sampai pada umur 2 hsp (p<0,05), namun panjang mutlak larva sampai pada 2 hsp tidak menunjukkan adanya perbedaan antar perlakuan (p>0,5). Berdasarkan hasil penelitian ini dapat disimpulkan bahwa suplementasi kurkumin dengan konsentrasi 0,5% pada induk betina ikan mas dapat mengoptimalkan pertumbuhan larva pada awal kehidupannya.Kata kunci : Cyprinus carpio, kurkumin, larva Early Development of Common Carp Larva from Broodstock Fed Diet Supplemented with CurcuminABSTRACTThe early growth of the larva is greatly influenced by the availability of food from the egg yolk. Insufficiency of nutrition in the early stages of development can affect the development of larva. The purpose of this study was to know the early growth of larva from broodstock supplemented with curcumin. This study used the female broodstock of common carp that supplemented with curcumin at several doses; 0%; 0,25%; 0,5%; 1%; and 2%. The fishes that had been mature were spawned, and the fertilized eggs were taken to be hatched. The larva was observed for 2 days after hatching (dah). The results showed that the treatment of curcumin supplementation with a dose of 0,5% given in the common carp feed gave an optimal value for egg diameter (p <0,05) and body length of the larva until the age of 2 dah (p <0,05), but did not differ for absolute length growth (p>0,05).Key words: Cyprinus carpio, curcumin, larva","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85057402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolasi dan Identifikasi Saponin dari Ekstrak Leunca (Solanium ningrum L) Secara Spektrofotometri Infra Merah","authors":"Aden Dhana Rizkita, Sintia Dewi, Emas Agus Prastyo Wibowo, Iham Maulana","doi":"10.35799/jis.v21i2.34635","DOIUrl":"https://doi.org/10.35799/jis.v21i2.34635","url":null,"abstract":"Penelitian ini dilakukan untuk mengisolasi dan mengidentifikasi senyawa saponin dengan maserasi menggunakan etanol 95% sampai mendapat ekstrak kering sebanyak 20 gram dengan dipanaskan menggunakan evaporator. Ekstraksi kedua dilakukan menggunakan corong pisah dengan pelarut dietil eter dan n-butanol. Identifikasi saponin dilakukan dengan tiga parameter uji diantaranya uji busa, uji warna dan gugus fungsi menggunakan Spektrofotometer Infra Merah. Hasil pengukuran Spektrofotometri Infra Merah menunjukkan Ekstrak Daun Launca mengandung beberapa gugus fungsi sebagai berikut : gugus –OH (puncak yang lebar pada bilangan gelombang 3444,87 cm-1), regang –CH alifatik simetri (bilangan gelombang 2926,01 cm-1 dan2854,65 cm-1, regang C=C tidak terkonjugasi pada bilangan gelombang 1606,7 cm-1, adanya regang C-H (bilangan gelombang 1074,35 cm-1 dan 1045,42 cm-1), dan adanya vibrasi bengkokan simetris C-O pada bilangan gelombang 1386,82 cm-1.Kata kunci: Daun leunca; spektrofotometer infra merah; saponin Isolation and Identification of Saponin from Leunca (Solanium ningrum L) Extract by Infrared SpectrophotometryABSTRACTThis research was conducted to isolate and identify saponin compounds by maceration using 95% ethanol to obtain 20 grams of dry extract by heating using an evaporator. The second extraction was carried out using a separating funnel with diethyl ether and n-butanol as solvents. Saponin identification was carried out with three test parameters including foam test, color test and functional group using Infrared Spectrophotometer. Infrared Spectrophotometry measurement results show that the Launca Leaf Extract contains the following functional groups: -OH group (wide peak at wave number 3444.87 cm-1), aliphatic symmetrical -CH stretch (wave number 2926.01 cm-1 and 2854 ,65 cm-1, unconjugated C=C stretch at wave number 1606.7 cm-1, presence of CH stretch (wave number 1074.35 cm-1 and 1045.42 cm-1), and the presence of symmetrical bending vibration of CO at wave number 1386.82 cm-1.Keywords: Infrared spectrophotometer;  leunca leaf; saponin","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75783687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aktivitas Antihipertensi Ekstrak dan Fraksi-Fraksi Daun Avokad (Persea americana Mill) pada Tikus Jantan dengan Parameter Sistolik dan Diastolik","authors":"N. Elisa, A. Anggoro, Erwin Indriyanti","doi":"10.35799/jis.v21i2.35625","DOIUrl":"https://doi.org/10.35799/jis.v21i2.35625","url":null,"abstract":"Penyakit kardiovaskuler yang terjadi di Indonesia berawal dari penyakit menular kemudian beralih menjadi tidak menular, salah satunya hipertensi. Tujuan dari penelitian ini untuk mengetahui skrining fitokimia dan hasil uji KLT ekstrak dan fraksi-farksi daun avokad pada tikus jantan yang dibuat model hipertensi dengan induksi NaCl dan prednison.  Pengujian ini dilakukan selama 28 hari menggunakan alat Blood Presure Analizer Tail Caff dengan kelompok perlakuan kontrol normal, positif, negatif, ekstrak dosis 75mg/kgbb, 150mg/kgbb, 250mg/kgbb dan fraksi air, etil asetat, n-heksana masing-masing kelompok berisi 5 ekor tikus. Pengukuran tekanan darah dilakukan pada T0 (belum diberi perlakuan), T1, T2, T3 (induksi NaCl dan Prednison), T4 (diberikan dosis ekstrak dan dosis fraksi). Hasil uji skrinning fitokimia positif flavonoid dan uji KLT dimana nilai Rf yang dihasilkan setelah percobaan KLT dengan metode penyinaran UV 254, ekstrak daun alpukat dengan menggunakan baku kuersetin yang dihasilkan Rf 0,75, fraksi air 0,82, n-heksana 0,93, etil asetat 0,82 dari hasil tersebut dapat dibuktikan terjadi penurunan aktivitas tekanan darah. Hasil persentasi penurunan ekstrak dan fraksi-fraksi daun alpukat menunjukkan dosis efektif ekstrak 250mg/kgbb yaitu 5,87/10,96% sig > 0,05 berbeda makna dengan kelompok negatif dan fraksi etil asetat 5.71/14.53%. sig > 0,05 berbeda makna dengan kelompok negatif.Kata kunci: Antihipertensi; daun avokad; diastolik; sistolik; tikus Anti-Hypertension Activity of Avocado (Persea americana Mill) Leaves Extracts and Fractions in Male Rats with Systolic and Diastolic ParametersABSTRACTOne of cardiovascular diseases that occur in Indonesia that start from infectious diseases and then turn into non-infectious diseases is hypertension. This study aimed to determine the phytochemical screening and TLC test results of avocado leaves extract and fractions in hypertension-modeled male rats through induction of NaCl and prednisone. This test was done in 28 days used Blood Pressure Analyzer Tail Caff with normal, positive, negative control treatment groups, extract doses of 75mg/kgbb, 150mg/kgbb, 250mg/kgbb and water, ethyl acetate, n-hexane fractions for each group. Each group contains 5 rats. Blood pressure measurement was done at T0 (untreated), T1, T2, T3 (induction of NaCl and Prednisone), T4 (given extract dose and fraction dose). The results of phytochemical screening test were positive for flavonoids and the TLC test, where the Rf value produced for avocado leaves extract after TLC test with UV 254 irradiation method, using quercetin standard produced was 0.75, water fraction was 0.82, n-hexane was 0.93, ethyl acetate was 0.82. These results then proved with decrease in blood pressure activity. The results of decreases in percentage of avocado leaves extract and fractions showed that the effective dose of extract 250mg/kgBW was 5.87/10,96% sig > 0.05, which was significantly different from negative group and ethyl acetate fraction was ","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88574711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Karakteristik Fisik, Total Padatan dan Hedonik Velva Nangka dengan Penambahan Gum Arab Sebagai Penstabil","authors":"Siti Susanti, V. P. Bintoro, Danur Restu Amanullah","doi":"10.35799/jis.v21i2.33861","DOIUrl":"https://doi.org/10.35799/jis.v21i2.33861","url":null,"abstract":"Velva nangka (VN) merupakan ekstensifikasi usaha pengolahan nangka sebagai hidangan pencuci mulut beku yang disukai. VN yang berkualitas menggunakan bahan penstabil yaitu kombinasi Carboxyl Methil Celullose (CMC) dan Gum Arab (GA). Penelitian ini bertujuan untuk mengetahui pengaruh penambahan GA sebagai bahan penstabil tunggal terhadap karakteristik fisik (overrun dan waktu pelelehan), total padatan dan hedonik VN. GA dengan variasi konsentrasi 0; 0,25; 0,5; 0,75; dan 1% terhadap total adonan digunakan sebagai penstabil pada pembuatan VN. Penambahan GA berpengaruh nyata pada karakteristik fisik dan total padatan serta hedonik tekstur namun tidak mempengaruhi rasa dan aroma VN. VN dengan penstabil GA 1% mempunyai overrun terendah (P<0,05) sedangkan GA >0,25-1% menghasilkan VN dengan waktu pelelehan lebih lama dan total padatan lebih tinggi (P<0,05). Penambahan GA >0,5-1% menghasilkan VN dengan tekstur yang makin disukai (P<0,05). Penambahan penstabil GA lebih dari 0,25% dalam adonan mampu menghasilkan VN berkualitas baik ditinjau dari karakteristik fisik dan total padatan dengan tekstur yang disukai.Kata kunci: Gum arab; nangka; penstabil; velva Characteristic of Physicals, Total Solids and Hedonik of Jackfruit Velva with Addition of Arabic Gum as StabilizerABSTRACTJackfruit velva (JV) is a business extensification of the jackfruit processing as a preferred frozen dessert. Good quality JV used a stabilizer such as combination of Carboxyl Methyl Cellullose (CMC) and Arabic Gum (AG). This study aimed to get more insight the effect of AG addition as a single stabilizer to the physical characteristics (overrun and melting time), total solids and hedonic JV. AG in various concentration of 0; 0.25; 0.5; 0.75; and 1% of the total dough was used as a stabilizer in the JV manufacture. The addition of AG significantly affected the physical characteristic, total solids and texture hedonic without any effect on the flavor and aroma of JV. JV with 1% AG stabilizer had the lowest overrun (P<0.05) while >0.25-1% AG resulted in JV with longer melting time and higher total solids (P<0.05). The addition of >0.5-1% AG resulted JV more favorable texture (P<0.05). The addition of more than 0.25% AG stabilizer in the dough was able to produce good quality JV in the aspects of physical characteristics and total solids with a preferred texture.Keywords: Arabic gum; jackfruit; stabilizer; velva","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75007521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tingkat Kebisingan dan Perambatan Suara Akibat Bunyi Luar Pada Gereja Masehi Injili Minahasa (GMIM) Kampus Unsrat dan GMIM Bethesda Manado","authors":"Sangkertadi Sangkertadi, Ronald Manganguwi","doi":"10.35799/jis.v21i2.35630","DOIUrl":"https://doi.org/10.35799/jis.v21i2.35630","url":null,"abstract":"Penelitian ini bertujuan untuk mengetahui kontribusi dinding dan arsitektur ruang serta jarak gedung ke jalan terhadap reduksi bising dari luar kedalam bangunan, dan distribusi bunyi yang terjadi. Studi kasus pada 2 gereja yaitu gereja GMIM Kampus Unsrat dan gereja GMIM Bethesda Ranotana di Kota Manado. Sebuah sumber bunyi di letakkan di luar ruang dekat pagar pada jarak 12 m terhadap gedung, dengan kuat bunyi konstan namun bervariasi antara 60 sampai dengan 100 dB dengan tahapan setiap 10 dB. Kuat bunyi dihitung dan diukur pada setiap jarak 2 m diruang luar dan dalam Gereja. Pengukuran menggunakan alat sound level meter. Perhitungan menggunakan teori akustik ruang dan software I_Simpa. Hasilnya menunjukkan bahwa konfigurasi arsitektur selubung dan ruang bangunan kedua gereja tersebut dalam keadaan kosong hanya mampu mereduksi bising sebesar 2.2 dan 3.7 dB, dengan jendela terbuka. Dengan sumber suara 100 dB di ruang luar, hasil pengukuran di ruang dalam pada kedua gereja mencapai 69.3 dB(A) dan 56.4 dB(A). Rentang bunyi tersebut masih tergolong bising dan belum memenuhi syarat kenyamanan bunyi untuk jenis bangunan ibadah menurut SNI. Visualisasi distribusi bunyi dengan menggunakan software I_Simpa, menunjukkan peran bukaan pintu dan jendela yang menyebabkan kebocoran bunyi kedalam ruangan.Kata kunci: Akustika;  bising; dinding; gereja Noise Level and Sound Propagation Due to Outside Sound at GMIM Church Unsrat Campus and GMIM Bethesda Manado ABSTRACTThis research aims to determine the contribution of walls and architectural interior, and the distance of the building to the road to the reduction of noise from outside into the building as well as the distribution of sound that occurs. Case studies on 2 churches: the GMIM Church of Unsrat Campus and the GMIM Bethesda Ranotana Church, both in Manado City. A sound source was placed outside the room near the fence at 12 m from the building. The sound source was constant but varied from 60 to 100 dB with steps every 10 dB. Sound reception was calculated and measured every 2 m distance at outside and inside. Measurements were carried out using sound level meter. Calculations by acoustic theory and I_Simpa software. The results show that the churches when room is empty, had only able to reduce the noise by 2.2 and 3.7 dB, with opened windows. When a 100 dB sound source was applied, the measurement results in the indoor of the two buildings reached 69.3 dB(A) and 56.4 dB(A). Graphical visualizations of sound distribution by using I_Simpa software, showed the role of door and opened window that cause sound leakage into the room.Keywords: Acoustic; church; noise; wall","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72763346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efektivitas Biolarvasida Serai Wangi (Cymbopogon nardus) Dengan Daun Cengkeh (Syzygium aromaticum L.) Terhadap Larva Aedes aegypti","authors":"C. L. Salaki, H. Wungouw, H. V. Makal","doi":"10.35799/jis.v21i2.35616","DOIUrl":"https://doi.org/10.35799/jis.v21i2.35616","url":null,"abstract":"Penelitian ini menguji efektivitas kombinasi biolarvasida minyak atsiri serai wangi (Cymbopogon nardus) dengan daun cengkeh (Syzygium aromaticum l.) Terhadap larva nyamuk Ae. aegypti. Penelitian ini bertujuan untuk: (a) menganalisis pengaruh pemberian kombinasi biolarvasida minyak atsiri serai wangi dan daun cengkeh terhadap perkembangan larva Ae. aegypti, (b) menganalisis uji daya bunuh kombinasi biolarvasida serai wangi (sw) dan daun cengkeh (dc) terhadap larva Ae. aegypti, (c) menganalisis uji patogenisitas dari kombinasi biolarvasida serai wangi dan daun cengkeh terhadap larva Ae. aegypti. Uji kombinasi biolarvasida ini dilakukan terhadap larva nyamuk Ae. aegypti instar III  dengan perlakuan variasi kombinasi konsentrasi “SW 2% (P)”, “ SW 0,75% ” + “DC1,25% (P1)”, “SW 1%” + “DC 1% (P2)”, “SW 1,25 %” + “DC 0,75% (P3)” , “DC 2% (P4)”. dan Kontrol air (P-). Themepos (P+). Parameter yang diamati meliputi gejala, persentase mortalitas dan waktu kematian.  Mortalitas larva diamati pada jam ke-6,12,18,24  setelah aplikasi. Perbedaan proporsi mortalitas antar tingkat konsentrasi dengan control diuji dengan metode chi-kuadrat sedangkan lT50 dengan analisis probit.  Hasil penelitian menunjukkan masing-masing kombinasi bahan uji (P,P1,P2,P3 dan P4) tidak memiliki perbedaan pengaruh yang sginifikan sebagai biolarvasida dengan taraf signifikansi sebesar 0,05.. Kesimpulan hasil penelitian ini bahwa kelima konsentrasi bahan uji tersebut tidak memberikan perbedaan pengaruh yang signifikan sebagai biolarvasida. Hal ini menunjukkan bahwa minyak atsiri serai wangi dan daun cengkeh baik diaplikasi secara tunggal maupun dikombinasi memiliki efektifitas larvasida yang sama dengan temephos dalam membunuh larva nyamuk Ae. aegypti. Waktu kematian (LT50)  ekstrak serai wangi 12,72 jam, daun cengkeh 6,71 jam dan kombinasi 6,38 jam.Kata kunci: Biolarvasida; efektifitas; konsentrasi; patogenisitas The Effectiveness of Biolarvacide Essential Oil of Vitronella (Cymbopogon nardus) with Clove Leaves (Syzygium aromaticum.L.) on Ae. aegypti Mosquito Larvae ABSTRACTThis study tested the effectiveness of the biolarvicide combination of citronella essential oil (cymbopogon nardus) and clove leaf (syzygium aromaticum L.) against the larvae of Ae. aegypti. This study aims to: (a) analyze the effect of giving a combination of biolarvicides of citronella essential oil and clove leaves on the development of Ae. aegypti, (b) analyzing the killing power of the combination of citronella (sw) and clove leaf (dc) biolarvicides against Ae. aegypti, (c) analyzing the pathogenicity test of the combination of citronella and clove leaf biolarvicides against the larvae of Ae. Agypti. This biolarvicide combination test was carried out on the larvae of Ae. aegypti instar iii with treatment variations in the concentration combination “SW 2% (P)”, “SW 0.75%” + “DC1.25% (P1)”, “SW 1%” + “DC 1% (P2)”, “SW 1.25%” + “DC 0.75% (P3)” , “DC 2% (P4)”. and Water control (P-). Themepos (P+). Parameters observ","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87928828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Keputusan Mahasiswa dalam Memilih Indekos dengan Analisis Faktor","authors":"Janet Graciela Paruntu, Djoni Hatidja, Y. Langi","doi":"10.35799/jis.v21i2.28868","DOIUrl":"https://doi.org/10.35799/jis.v21i2.28868","url":null,"abstract":"Tujuan penelitian ini yaitu mengetahui faktor yang menjadi keputusan mahasiswa Program Studi Matematika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Sam Ratulangi (FMIPA UNSRAT) dalam memlilih indekos. Penelitian dilakukan dengan membagikan kuesioner kepada 60 responden mahasiswa aktif Program Studi Matematika FMIPA UNSRAT angkatan 2016-2019. Data dianalisis dengan menggunakan analisis faktor. Hasil penelitian menunjukkan ada empat faktor yang terbentuk dan bisa menjelaskan variabel-variabel yang ada dengan baik. Faktor paling dominan yang mempengaruhi keputusan mahasiswa dalam memilih Indekos adalah faktor lokasi dan harga dengan nilai eigen 4.130 dengan keragaman varian sebesar 31.769%.Kata kunci: Analisis faktor; fasilitas; indekos;Decision Students in Choosing Indekos with Factor AnalysisABSTRACTThe objective of this research was conducted to determine what factors are the student of mathematics study program Sam Ratulangi University decision in choosing boarding house. The study was conducted by distributing questionnaires to 60 respondents, namely, active students of the Mathematics Study Program Elemental School of 2016-2019. By using factor analysis, the results of the study showed that there explain the variables correctly. The most dominant factor affecting students’ decision to select indexes is the location factor and price of 4.130 with a varied varan of 31.769%.Keywords : Factor analysis, facility; indekos","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90834816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Lama Fermentasi terhadap Total Asam, Total Bakteri Asam Laktat dan Warna Kefir Belimbing Manis (Averrhoa carambola)","authors":"S. Mulyani, Kusuma Melati Faizun Sunarko, Bhakti Etza Setiani","doi":"10.35799/jis.21.2.2021.31416","DOIUrl":"https://doi.org/10.35799/jis.21.2.2021.31416","url":null,"abstract":"Penelitian ini bertujuan untuk mengetahui pengaruh lama fermentasi terhadap total asam, total bakteri asam laktat dan warna L*a*b* dari water kefir buah belimbing manis. Rancangan penelitian yang digunakan adalah rancangan acak lengkap (RAL), dengan 4 perlakuan dan 5 kali ulangan. Perlakuan yang  diteliti   adalah  variasi  lama  fermentasi  yaitu  12  jam  (t1),  24  jam  (t2),  36  jam  (t3),  dan  48  jam  (t4). Water kefir dibuat dari belimbing manis dengan menggunakan grain water kefir sebanyak 5%, sukrosa sebanyak 8%(b/v). Hasil penelitian menunjukkan bahwa lama fermentasi yang berbeda memberikan pengaruh nyata terhadap total asam, total bakteri asam laktat, nilai L* warna dan nilai a* warna serta tidak berpengaruh secara nyata (p>0,05) pada nilai b* warna. Semakin lama fermentasi dapat  meningkatkan total asam, total bakteri asam laktat, nilai L* warna serta menurunkan nilai a* warna.Kata kunci: Bakteri asam laktat; belimbing manis; water kefirFermentation Time Effect on Total Acid, Total Lactic acid Bacteria Color of Star Fruit Water KefirABSTRACTThis study aims to determine the effect of fermentation time on total acid, total lactic acid bacteria and color lab of sweet star fruit water kefir. The research design used was a completely randomized design (CRD), with 4 treatments and 5 replications. The experimental treatments were variation of fermentation time of 12 hours (t1), 24 hours (t2),36 hours (t3), and 48 hours (t4).  Water kefir is made from sweet starfruit using 5% water kefir grains and 8% sucrose. The results showed that different fermentation time had a significant effect on total acid, total lactic acid bacteria, color L* value and color a* value and had no significant effect (p.0,05) on color b* values. The longer the fermentation will increase the total acid, the total lactic acid bacteria, the L* color value and decrease the a* color value.Keywords: Lactic acid bacteria; star fruit; water kefir","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74017402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antibacterial Activity Testing on APMS (p-Methoxy Cinnamic Acid) Against Escherichia coli Bacteria","authors":"A. F. Masduqi, E. Indriyanti, R. S. Dinurrosifa","doi":"10.35799/jis.v21i2.35684","DOIUrl":"https://doi.org/10.35799/jis.v21i2.35684","url":null,"abstract":"This study aims to determine whether the compound APMS (p-methoxy cinnamic acid) has the antibacterial activity of Escherichia coli and to determine the effective concentration of the compound APMS (p-methoxy cinnamic acid) in inhibiting the growth of Escherichia coli bacteria. This research begins with the synthesis of APMS obtained through the knoevenagel condensation reaction with the sonochemical method. The synthesized compounds were tested organoleptically and their melting points were measured. The structure of the results was elucidated using FT-IR and GC-MS, then tested the antibacterial activity of APMS compounds against Escherichia coli. Data analysis with SPSS, 99% confidence level (p<0.01) and continued with ANOVA test. The compound synthesized by APMS is in the form of fine crystals with a glossy white color, has a characteristic odor, and produces a % yield of 92.71%. The level of p-methoxy cinnamic acid (APMS) produced from this study was 95% using the GC-MS Instrument. APMS compounds have antibacterial activity against Escherichia coli. The average inhibition zone formed at a concentration of 5%; 10%; and 15% respectively are 0.695 cm; 0.727 cm; and 0.855 cm The optimal concentration of this study was at a concentration of 15% which gave the greatest inhibitionKeywords: Antibacterial; Escherichia coli; p-Methoxy cinnamic acidUji Aktivitas Antibakteri Senyawa APMS (Asam p_Metoksi Sinamat) Terhadap Bakteri Escherichia coli  ABSTRAKPenelitian ini bertujuan untuk mengetahui apakah senyawa APMS (Asam p-metoksisinamat) memiliki aktivitas antibakteri Escherichia coli dan mengetahui konsentrasi efektif dari senyawa APMS (Asam p-metoksisinamat) dalam menghambat pertumbuhan bakteri Escherichia coli. Penelitian ini diawali dengan sintesis APMS ini didapatkan melalui reaksi kondensasi knoevenagel dengan metode sonokimia. Senyawa hasil sintesis diuji organoleptis dan diukur titik leburnya. Struktur hasil dielusidasi menggunakan  FT-IR dan GC-MS, kemudian uji aktivitas antibakteri senyawa APMS terhadap Escherichia coli. Analisis data dengan SPSS, tingkat kepercayaan 99% (p<0,01) dan dilanjutkan uji ANOVA. Senyawa hasil sintesis APMS berupa kristal halus berwarna putih mengkilap, memiliki bau khas, dan menghasilkan % yield sebesar 92,71%. Kadar Asam Para Metoksisinamat (APMS) yang dihasilkan dari penelitian ini sebesar 95% menggunakan Instrumen GC-MS. Senyawa APMS memiliki aktivitas antibakteri terhadap Escherichia coli. Rataan zona hambat yang terbentuk pada konsentrasi 5%; 10%; dan 15% secara berturut adalah 0,695 cm; 0,727 cm; dan 0,855 cm Konsentrasi yang optimal dari penelitian ini adalah pada konsentrasi 15% yang memberikan daya hambat yang paling besar.Kata kunci:  Antibakteri; Asam p-metoksi sinamat; Escherichia coli","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72821595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model Regresi Poisson Tergeneralisasi untuk Anak Gizi Buruk di Sulawesi Utara","authors":"Faranika Deysi G Maneking, D. T. Salaki, Djoni Hatidja","doi":"10.35799/jis.20.2.2020.29133","DOIUrl":"https://doi.org/10.35799/jis.20.2.2020.29133","url":null,"abstract":"Salah satu masalah kesehatan yang sering terjadi di Indonesia adalah gizi buruk.  Seorang anak yang mengalami gizi buruk akan rentan terhadap berbagai penyakit karena sistem kekebalan tubuhnya mudah terinfeksi virus.  Jumlah kasus anak gizi buruk merupakan data diskrit y­­ang dapat dimodelkan dengan regresi poisson.  Penelitian ini bertujuan untuk menentukan model regresi poisson tergeneralisasi dalam mengatasi overdispersi pada model regresi poisson dari jumlah kasus gizi buruk dan menentukan faktor-faktor yang mempengaruhi jumlah kasus gizi buruk di Sulawesi Utara tahun 2018. Data yang digunakan berupa jumlah kasus gizi buruk sebagai variabel respon dan sejumlah variabel prediktor dengan unit pengamatannya adalah kota dan kabupaten di Sulawesi Utara.  Hasil penelitian menunjukkan bahwa variabel yang mempengaruhi jumlah anak gizi buruk di Sulawesi Utara adalah persentase bayi dengan berat badan lahir rendah (BBLR) dan variabel yang tidak berpengaruh signifikan adalah jumlah posyandu, persentase keluarga yang memiliki sanitasi layak pakai, jumlah penduduk miskin, persentase bayi yang menggunakan ASI ekslusif dengan model regresi poisson tergeneralisasi.Kata kunci: Keluarga eksponensial; multikolinearitas; overdispersi; Sulawesi UtaraGeneralized Poisson Regression Model For Malnourished Children in North SulawesiABSTRACTOne of the health problems that often occurs in Indonesia is malnutrition.  A child who is suffering from malnutrition will be vulnerable to various diseases because his immune system is easily infected by a virus.  The number of cases of malnutrition children is discrete data that can be modeled by Poisson regression. This study aimed to determine the Generalized Poisson Regression (GPR) model for handling the overdispersion occurred in the Poisson regression model of the number of malnutrished children case and also to determine the factors that influence the number of malnutrished children case in North Sulawesi in 2018. This study utilizes the number of cases of malnutrition as a response variable and a number of predictor variables with the observation unit was cities and districts in North Sulawesi. The results of this study indicate that the variables that significantly affect the number of malnourished children in North Sulawesi include the percentage of child with low weight birth (LWB) and variables that have no significant effect are the number of posyandu, the percentage of families who have decent sanitation, the number of poor people, the percentage of babies who use exclusive breast milk with the generalized poisson regression model Keywords: Exponential family; multicolinearity; overdispersion; North SulawesiSalah satu masalah kesehatan yang sering terjadi di Indonesia adalah gizi buruk.  Seorang anak yang mengalami gizi buruk akan rentan terhadap berbagai penyakit karena sistem kekebalan tubuhnya mudah terinfeksi virus.  Jumlah kasus anak gizi buruk merupakan data diskrit y­­ang dapat dimodelkan dengan regresi pois","PeriodicalId":17715,"journal":{"name":"JURNAL ILMIAH SAINS","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79171508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}