Judul: Perencanaan Sistem Pengolahan Tanah Secara Mekanis Dalam Usaha Pengembangan Tebu Suatu Kasus Di P.G. Asembagus
Abstrak: Tujuan pengolahan tanah terutama adalah untuk memperbaiki struktur tanah. Pengolahan tanah mengakibatkan perubahan pada porositas tanah, sehingga keadaan tata air, tata udara dan penetrasi akar dapat diperbaiki. Terjaminnya tata air dan tata udara akan meningkatkan aktifitas mikroba tanah dalam proses dekomposisi bahan organik. Keadaan tanah di perkebunan tebu P.G. Asembagus cukup sesuai untuk pertumbuhan tebu. Di lahan perkebunan tebu P.G. Asembagus telah dilakukan pengolahan tanah secara mekanis tetapi belum direncanakan dalam suatu sistim yang baik. Beberapa permasalahan memperkecil efisiensi dan efektifitas pengolahan tanah secara mekanis di P.G. Asembagus. Permasalahan-permasalahan tersebut meliputi traktor, peralatan, "operator", keahlian tenaga kerja, bengkel, garasi, bahan bakar, pelumas, metoda pengolahan tanah serta organi- sasinya. Dengan suatu perencanaan yang logis dan terperinci maka efisiensi, efektifitas, produktifitas dan profitabilitas diharapkan dapat dicapai secara optimum. ...
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Judul: Pemadatan Tanah Akibat Operasi Mesin Pada Budidaya Tebu Lahan Kering di PT. PG. Rajawali I1 Unit PG. Subang, Jawa Barat.
Abstrak: Di Indonesia, budidaya tebu lahan kering (terutama di perusahaan perkebunan) merupakan sistem pertanian yang secara intensif mendayagunakan peralatan mekanik di berbagai tahap proses produksi. Penggunaan peralatan mekanik seringkali memberikan efek yang tidak diharapkan terhadap kondisi tanah, yaitu terjadinya pemadatan tanah akibat lintasan lnesin pertanian, baik pada waktu pengolahan tanah, pemeliharaan tanaman, pemanenan dan pengangkutan hasil panen.
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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