The effect of salinity on the release of copper (Cu), lead (Pb) and zinc (Zn) from tailing = Pengaruh salinitas terhadap pelarutan tembaga (Cu), timbal (Pb) ...

The effect of salinity on the release of copper (Cu), lead (Pb) and zinc (Zn) in tailing sediment have been studied by stripping voltammetry. The purpose of the research is to know the effect of salinity on the release of metals with certain pH, conductivity and variety of metals. Simultaneous determination of copper, lead and zinc in tailing was done by Differential Pulse Anodic Stripping Voltammetry (DPASV) onto hanging mercury drop electrode (HMDE) and nitric acid 65% as support electrolyte. The limit of detection for this method 0.60 Lig/L, 0.150 !AWL and 0.238 Ltg/L for copper, lead and iMc respectively. The stripping solution of 30 O/o. salinity with pH= 7.85, conductivity= 46.62 mS/cm gives the a mounts of dreleased metals as follows :14.867 pg/L Cu, 0.976 pg/L Pb and 6.224 pg/L Zn These results are higher as compared with the results from 15 °/00 salinity with pH= 7.66, conductivity= 23.22 mS/cm that give released metals of Cu= 7.988 Ag/L, Pb= 0.311 Lig& and Zn= 4.699 pg/L. the results from ANOVA suggest that this is due to different in salinity of the solution. It also found thet the conductivity does not give any effect. It can be concluded that the higher salinity will that give higher concentration or released metals. Keywords: tailing, salinity and volammetr

The Effect of Salinity on the Release of Copper (Cu), Lead (Pb) And Zinc (Zn) from Tailing

The effects of salinity on the release of copper (Cu), lead (Pb) and zinc (Zn) in tailing sediment have been studied by stripping voltammetry. The purpose of the research is to know the effect of salinity on the release of metals with certain pH, conductivity and variety of metals. Simultaneous determination of copper, lead and zinc in tailing was done by Differential Pulse Anodic Stripping Voltammetry (DPASV) onto hanging mercury drop electrode (HMDE) and nitric acid 65% as support electrolyte. The limit of detection for this method 0.60 µg/L, 0.150 µg/L and 0.238 µg/L for copper, lead and iMc respectively. The stripping solution of 300/00 salinity with pH= 7.85, conductivity= 46.62 mS/cm gives the amounts of released metals as follows :14.867 µg/L Cu, 0.976 µg/L Pb and 6.224 µg/L Zn. These results are higher as compared with the results from 15 0/00 salinity with pH= 7.66, conductivity= 23.22 mS/cm that give released metals of Cu= 7.988 µg/L, Pb= 0.311 µg/L and Zn= 4.699 µg/L. the results from ANOVA suggest that this is due to different in salinity of the solution. It also found that the conductivity does not give any effect. It can be concluded that the higher salinity will that give higher concentration or released metals

DAMPAK MINAT TERHADAP HASIL BELAJAR KOGNITIF SISWA PADA MATERI HIDROLISIS GARAM DI MADRASAH ALIYAH (MA) NEGERI MANOKWARI SELAMA PANDEMI COVID-19

Kegiatan pembelajaran memerlukan metode yang tepat terutama dimasa pandemi COVID-19 yang mengadakan pembelajaran online. Pembelajaran online membutuhkan motivasi dan pemahaman konsep yang lebih agar minat belajar siswa meningkat sehingga dapat mengikuti proses pembelajaran dengan baik. Penelitian ini bertujuan untuk: (1) Untuk mengetahui  dampak minat terhadap hasil belajar kognitif siswa  dan (2) persen  pengaruh dampak minat terhadap hasil belajar kognitif siswa belajar siswa pada materi hidrolisis garam kelas XI IPA MA Negeri Manokwari selama pandemi COVID-19. Penelitian ini menggunakan metode kuantitatif dengan pendekatan deskriptif . Populasi yang digunakan siswa kelas XI IPA 1 dan IPA 2 MA Negeri Manokwari Semester Genap Tahun ajaran 2021/2022 terdiri sebanyak 35 orang siswa. Teknik pengambilan sampel menggunakan sampling jenuh. Teknik pengumpulan data dilakukan dengan teknik wawancara, observasi, dokumentasi, dan angket minat belajar. Berdasarkan hasil penelitian menunjukkan adanya dampak negatif dan positif pada minat terhadap hasil belajar siswa yang diperoleh dari persentase respon siswa, dan adanya pengaruh yang signifikan sebesar 0,003. Berdasarkan analisis R Square menunjukkan adanya pengaruh minat belajar sebesar 23%

ISOLATION AND PRESENCE OF ANTIMALARIAL ACTIVITIES OF MARINE SPONGE Xestospongia sp.

Plasmodium falciparum, the agent of malignant malaria, is one of mankind\u27s most severe scourges, mainly in the tropic world. Efforts to develop preventive vaccines or remedial drugs are handicapped by the parasite\u27s rapid evolution of drug resistance. Here, we presented an advance work on examination of antimalarial component from marine life of Xestospongia sp., the study is based on hexane extraction method. The premier result, we obtained five fractions. Among these five fractions, the fourth has the most potent inhibitory against the growth of P. falciparum 3D7 with an IC50: 7.13 pg/mL. A compiled spectrum analysis, FTIR, 11-1-NMR and GC-MS, revealed that the fourth fraction consisted abundantly of two secondary metabolites such as fiavonoids and triterpenoids. Finally, our results suggest a plausible structure rooted to the base of ibuprofen. Plasmodium falciparum adalah parasit penyebab utama penyakit malaria, yang merupakan salah sate penyakit terparah di negara-negara tropis. Sayangnya, upaya pengembangan vaksin preventif atau abet remedial lainnya sedang menghadapi kendala besar karena cepatnya evolusi resistensi obat malaria. Berikut, kami ketengahkan hasil riset kali ini tentang uji aktivitas antimalaria dari spons laut Xestospongia sp. yang diekstraksi dengan menggunakan pelarut n-heksana. Hasil pengamatan menghasilkan lima fraksi. Hasil identifikasi menggunakan FT1R, \u27H-NMR dan GC-MS, menunjukkan bahwa fraksi keempat menghasilkan daya hambat tertinggi terhadap pertumbuhan P. falciparum 3D7 (IC50: 7.13 pg/mL). Dapat kami laporkan pula bahwa fraksi keempat terdeteksi mengandung senyawa metabofit sekunder, flavonoid dan triterpenoid. Terakhir, penelitian ini menghasilkan suatu struktur dugaan dengan basal ibuprofen

Unsur Kelumit Esensial (Mn Dan Zn) dalam Biji Kakao (Theobroma Cacao L.) dari Daerah Perkebunan Ransiki Papua Barat

Cocoa is a rich source of essential minerals and contributes a significant amount of minerals in the human diet. Processed products from cocoa in the form of chocolate are in great demand by almost everyone from various statuses and social groups. The high consumption of chocolate is also not a fact that chocolate is beneficial to human health. The essential minerals (Mn and Zn) in cocoa beans are needed by the human body as a source of minerals, but if excess can be harmful to the body. The purpose of this study was to determine the content of essential trace elements in cocoa beans and their potential as raw materials for food products. The analysis method uses AAS (Atomic Absorption Spectrophotometry). The results showed the content of micronutrients (Mn and Zn) in cocoa beans at five location points with an average value of 0.8976 mg/100 g and 5.7534 mg/100 g

ISOLATION AND PRESENCE OF ANTIMALARIAL ACTIVITIES OF MARINE SPONGE <i>Xestospongia</i> sp.

Plasmodium falciparum, the agent of malignant malaria, is one of mankind's most severe scourges, mainly in the tropic world. Efforts to develop preventive vaccines or remedial drugs are handicapped by the parasite's rapid evolution of drug resistance. Here, we presented an advance work on examination of antimalarial component from marine life of Xestospongia sp., the study is based on hexane extraction method. The premier result, we obtained five fractions. Among these five fractions, the fourth has the most potent inhibitory against the growth of P. falciparum 3D7 with an IC50: 7.13 µg/mL. A compiled spectrum analysis, FTIR, 1H-NMR and GC-MS, revealed that the fourth fraction consisted abundantly of two secondary metabolites such as flavonoids and triterpenoids. Finally, our results suggest a plausible structure rooted to the base of ibuprofen

Implementation of Problem-based Learning Model to Enhance Students Learning Outcomes in Buffer Solutions Topic

This research aims to determine the improvement of the process and learning outcomes of the buffer solutions topic by applying the Problem-based Learning (PBL) model. This research is based on Classroom Action Research (CAR) takes place in two cycles, with several stages including planning, implementing, observing, and reflecting. Our present study used 17 students of natural science 11th grade SMA Advent Manokwari. The data was obtained from teachers and students. The data collection method used cognitive learning outcomes and observation. The data analysis uses descriptive analytic techniques. Our findings showed that the application of the PBL model can improve the quality of the learning process on the buffer solutions topic; the application of the Problem-based Learning (PBL) learning model has increased from cycle I with an average grade of 65.36 and a percentage of passing grades of 41% and cycle II with an average grade of 83.66 and a percentage of passing grades of 88%

ISOLATION AND PRESENCE OF ANTIMALARIAL ACTIVITIES OF MARINE SPONGE <i>Xestospongia</i> sp.

Plasmodium falciparum, the agent of malignant malaria, is one of mankind's most severe scourges, mainly in the tropic world. Efforts to develop preventive vaccines or remedial drugs are handicapped by the parasite's rapid evolution of drug resistance. Here, we presented an advance work on examination of antimalarial component from marine life of Xestospongia sp., the study is based on hexane extraction method. The premier result, we obtained five fractions. Among these five fractions, the fourth has the most potent inhibitory against the growth of P. falciparum 3D7 with an IC50: 7.13 µg/mL. A compiled spectrum analysis, FTIR, 1H-NMR and GC-MS, revealed that the fourth fraction consisted abundantly of two secondary metabolites such as flavonoids and triterpenoids. Finally, our results suggest a plausible structure rooted to the base of ibuprofen

Aktivitas Antidiabetes dari fraksi Sauauria bracteosa pada Tikus dengan Metode Induksi Aloksan

Penderita diabetes mellitus disebabkan oleh kurangnya sekresi insulin yang diperkirakan mengalami peningkatan dari 8,4 menjadi 21,3 juta jiwa pada 2000 hingga 2030 mendatang. Seiring dengan semakin meningkatnya penderita penyakit diabetes mellitus, maka perlu dilakukan pencarian berbagai alternatif obat herbal dari tumbuhan. Salah satu tumbuhan yang berpotensi sebagai pengobatan diabetes mellitus seperti Sauauria bracteosa yang banyak tumbuh liar di daerah tropis. Tujuan dari penelitian ini menguji aktivitas antidiabetes dari fraksi S. bracteosa diujikan lebih lanjut ke hewan percobaan (tikus). Metode pengujian aktivitas antidiabetes dilakukan dengan metode induksi aloksan terhadap fraksi tumbuhan S. bracteosa dengan dosis 250 mg/kg BB tikus. Induksi aloksan dosis 175 mg/kg BB tikus pada hari ke 0-6. Hasil pengujian aktivitas antidiabetes fraksi n-heksana memiliki aktivitas antidiabetes yang lebih tinggi 43,05% dibandingkan dengan fraksi etil asetat sebesar 33,22% dan fraksi air sebesar 8,88%. Persentase penurunan kadar glukosa kelompok fraksi n-heksana dan fraksi etil asetat pada dosis 100 mg/kgBB menunjukkan penurunan yang lebih tinggi daripada kelompok kontrol positif sebesar 20,93% yang diberikan glibenklamid dosis 0,5 mg/kg BB. Hal ini menunjukkan bahwa tumbuhan S. bracteosa berpotensi kuat sebagai penurun gula darah terutama fraksi n-heksana dan fraksi etil asetat