Judul: Rancang Bangun Penjatah Pupuk pada Alat Tanam dan Pemupuk Kedelai dengan Tenaga Tarik Traktor Tangan
Abstrak: Ketersediaan kedelai di Indonesia pada dasarnya dipengaruhi oleh kurangnya keseriusan pada budidaya kedelai terutama pada budidaya bibit unggul dan kurangnya peran mekanisasi pertanian pada proses produksi. Sejalan dengan masalah tersebut maka perlu dikembangkan alat dan mesin budidaya pertanian dalam ha1 ini kedelai. Pengembangan alat dan mesin yang dimaksud di sini adalah dalam konteks efisiensi dan efektifitas. Hal ini terutama dalam ha1 penanaman dan pemupukan. Inefisiensi ini diduga karena rancangannya hanya menggunakan efisiensi teknis tanpa memperhitungkan faktor sosial ekonornis. Oleh karena itu perlu dirancang alat penanam dan pemupuk kedelai yang dapat meningkatkan efisiensi penanaman.
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Judul: Desain Mesin Penanam Kedelai dengan Pengolahan Tanah Alur
Abstrak: Upaya peningkatan produksi dan produktivitas kedelai di Indonesia dapat dilakukan di antaranya melalui mekanisasi dalam pengolahan tanah dan penanaman kedelai. Efisiensi tenaga dalam kegiatan pengolahan tanah dan penanaman dapat ditingkatkan dengan mengintegrasikan pngolahan tanah dalam alur dan penanaman benih. Tujuan dari penelitian ini adalah mendesain mesin penanam kedelai terintegrasi dengan pengolahan tanah alur menggunakan tenaga gerak traktor beroda-2. Penelitian ini dimulai dari proses perancangan, pabrikasi prototipe, sampai dengan pengujian kinerja prototipe. Sebuah traktor tangan yang dilengkapi unit pengolah tanah rotari digunakan sebagai sumber tenaga dan pengolahan tanah dua alur, dengan mengatur posisi dan jumlah pisau rotari yang digunakan. Dua unit penanam benih kedelai dengan penjatah tipe piringan bercelah dan digerakkan oleh sebuah roda bantu didesain untuk menanamkan benih kedelai pada jarak tanam 20 cm dan jarak antar alur 40 cm. Hasil pengujian kinerja menunjukkan bahwa pengolahan tanah alur dan penanaman benih sudah cukup baik. Benih yang tertanam berjumlah satu atau dua benih per lubang, pada jarak tanam 18-23 cm, kedalaman tanam benih 3.5-5 cm, dan jarak antar alur 35-43 cm. Pada kecepatan maju 0.341 m/s, kapasitas lapangan efektif dari prototipe mesin penanam rata-rata 781.48 m2/jam, kapasitas lapangan teoritisnya 920.10 m2/jam, dan efisiensi lapangan 84.93%.
Keyword: mesin penanam, pengolahan tanah alur, kedelai, traktor beroda-2, desain.

Judul: Seroprevalence of Chikungunya and The Risk of Transmission Transmitted Among Blood Donors In Sulawesi-Indonesia
Abstrak: Chikungunya (CHIK) is an arthritogenic alphavirus in the Togaviridae family of arboviruses with an enveloped RNA containing a positive single-stranded 11.8 kb genome. Transmission occurs through the bite of infected Aedes mosquitoes, which are commonly found in tropical and temperate regions. Primary vertebrate hosts include monkeys and humans, in whom this virus replicates efficiently (Diallo et al. 1999). Chikungunya virus (CHIKV) is known for causing acute illness, manifesting with fever, rash, and arthralgia known as Chikungunya fever (Horwood dan Buchy 2015). Despite the high number of Chikungunya cases in Indonesia, comprehensive data are lacking in CHIKV seroprevalence. Previous studies reported the median seroprevalence of anti-CHIKV antibodies in all situations 18.5%, ranging from 0.0 – 73.% (Harapan et al., 2019). However, the gap in epidemiological data of CHIKV in many regions of Indonesia including Sulawesi, is noteworthy. The objective of this study was to determine the seroprevalence of CHIKV infection among healthy individuals from North and South Sulawesi using archive samples. Additionally, an asymptomatic course of CHIKV infection and the high pre-symptomatic viral load as 108pfu/mL (Appassakij et al. 2013) suggest that the infection can threaten blood transfusion safety. Evidence of CHIKV infection among blood donors (Simmons et al. 2016) indicates transfusion-transmitted is probable, although it has not been documented (Petersen dan Epstein 2014). Our study also aimed to test the archive blood donor specimens from North Sulawesi for CHIKV IgM and viremia to determine blood safety in endemic areas. Samples were screened for anti-CHIKV IgG antibodies to determine exposure to CHIKV using an in-house IgG ELISA as previously described (Kosasih et al. 2013) with minor modifications. CHIKV IgM, a marker for recent infection and endemicity, was tested in 303 samples randomly selected from IgG-positive samples using a Euroimmun anti-CHIKV IgM ELISA kit (Luebeck, Germany) following the manufacturer’s instructions. CHIKV RNA detection was carried out using one-step-qRT-PCR. The data generated were analyzed with IBM-SPSS v20 (IBM Corporation, USA). Chi-square (χ2) test to determine significant differences between categorical variables, and a p-value less than 0.05 was considered statistically significant. As many as 1092 serum and plasma samples were analyzed, with CHIK IgG seropositivity at 53.48% (584/1092). The results also show a statistically significant difference in the seropositive rates based on gender (58.8% male and 48.5% female) and region (53.9% South Sulawesi versus 48.7% North Sulawesi). Seropositivity increased with age; approximately half of adults between their 40s and 60s had seroconverted. Most of the participants, 304 (27.8%), were between 21-30 years. The age groups with the least participants were those >60 years and <20 years, with 93 participants each (8.5%), followed by the 51–60-years age group with 142 (13.0%) participants. In addition to IgG, the overall anti-CHIKV IgM seropositivity comprised 12.9% (39/303). A Chi-square analysis shows a statistical significance of anti-CHIKV IgM seropositivity based on gender and region with p-values (p=0.047 and p=0.038, respectively). On the contrary, there was no significant difference in anti-CHIK IgM based on age. The age group with the most participants was the 21-30 years with 19.3% (16/83), while those with the least participants were those >60 years. The current study
Keyword: Chikungunya, Serosurvey, Sulawesi, Blood donors, ELISA, qRT-PCR.