Judul: Analisis kebutuhan draft pengolahan tanah sawah pasang surut dengan menggunakan soil-bin
Abstrak: Draft pengolahan tanah dipengaruhi oleh alat yang digunakan, cara bergeraknya alat dan keadaan tanah. Kondisi tanah sawah pasang surut yang tergenang di musim hujan dan kekeringan di musim kemarau kemungkinan akan membentuk tanah dengan sifat-sifat yang berbeda dengan tanah sawah dan tanah kering. Penelitian pengolahan tanah sawah pasang surut dengan menggunakan soil-bin system dilaksanakan di Laboratorium Budidaya, Fakultas Teknologi Pertanian, IPB. Tujuan penelitian adalah untuk mengetahui pengaruh pemadatan, kadar air dan kecepatan pemotongan tanah terhadap draft pengolahan tanah serta menentukan model hubungan matematis antara draft dan faktor yang mempengaruhinya melalui analisis nondimensi. ...
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Judul: Pengaruh pemberian bahan organik terhadap kebutuhan draft pengolahan tanah dengan bajak singkal
Abstrak: Penelitian ini dilakukan pada tanah jenis Podsolik Merah Kuning bertekstur liat dilokasi UPT-IPB Jonggol, Bogor. Tujuan penelitian adalah mengukur kebutuhan draft pada pengolahan tanah dengan bajak singkal sebagai pengaruh kecepatan maju traktor dan kedalaman olah. Selain itu di- lakukan pengamatan terhadap slip roda dan mengkaji penga- ruh pengolahan dan pemberian bahan organik terhadap ke- butuhan draft. Hasil penelitian menunjukkan, bahwa bertambahnya ke- cepatan dan kedalaman olah mengakibatkan naiknya draft. Draft minimum terjadi pada kedalaman olah 5 cm masing-ma- sing 430.41, 341.09, 311.76 dan 248.03 kgf untuk V1T1, V1T2, V1T3 dan V1T4. Pengolahan dan pemberian bahan orga- nik sebelumnya akan menurunkan draft, dimana rata-rata draft pada T4<T3<T2<T1...
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Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity