Judul: Psychological Well-Being and Impulsive Buying: The Role of  Social Support, Self-Esteem, and Instagram Usage Intensity through  Social Comparison
Abstrak: Tingginya penggunaan media sosial memiliki faktor penyebab dan dampak. Salah satu media sosial yang paling banyak digunakan adalah Instagram. Salah satu faktor penyebab penggunaan Instagram adalah harga diri dan dukungan sosial dapat memicu terjadinya perbandingan sosial yang berdampak pada kesejahteraan psikologis dan perilaku pembelian impulsif. Penelitian ini bertujuan untuk menganalisis pengaruh dukungan sosial, harga diri, intensitas penggunaan Instagram terhadap kesejahteraan psikologis dan pembelian impulsif melalui perbandingan sosial. Penelitian ini menggunakan desain penelitian eksplanatori dengan teknik pengambilan sampel secara sukarela. Penelitian ini memiliki 222 responden dengan kriteria individu adalah pengguna Instagram yang berusia 18-24 tahun dan berdomisili di Indonesia. Analisis data yang dilakukan berupa analisis deskriptif, uji hubungan, dan uji pengaruh SEM dengan menggunakan aplikasi SPSS 25.0 dan Lisrel. Hasil penelitian menunjukkan bahwa dukungan sosial memiliki pengaruh terhadap intensitas penggunaan Instagram. Kemudian terdapat pengaruh langsung dan tidak langsung intensitas penggunaan Instagram terhadap pembelian impulsif. Dengan memiliki kontrol diri diharapkan mampu mengatasi penggunaan Instagram yang memberikan dampak negatif seperti impulsive buying.
Keyword: impulsive buying, Instagram, self-esteem, social comparison, social support

Judul: The Influence of Social Media Exposure, Reference Group, Social Comparison, and Materialism on Impulsive Buying Behavior
Abstrak: Pembelian impulsif merupakan pembelian yang dilakukan secara spontan tanpa perencanaan sebelumnya dan tanpa mempertimbangkan konsekuensi yang didapat. Penelitian ini bertujuan menganalisis pengaruh paparan media sosial, kelompok acuan, perbandingan sosial, dan materialisme terhadap perilaku pembelian impulsif. Contoh dalam penelitian ini merupakan pengguna Instagram dan seorang pengambil keputusan pembelian barang dan jasa yang berusia 17-55 tahun. Desain penelitian yang digunakan adalah cross-sectional study dengan survei online pada 292 contoh. Hasil penelitian menemukan bahwa kelompok acuan berpengaruh signifikan positif terhadap perbandingan sosial. Perbandingan sosial berpengaruh signifikan positif terhadap materialisme. Hasil penelitian ini menunjukkan terdapat pengaruh yang signifikan positif dari paparan media sosial dan materialisme terhadap perilaku pembelian impulsif. Hal tersebut patut menjadi pertimbangan bagi pemerintah/nonpemerintah untuk menyelenggarakan edukasi melalui lembaga, seperti YLKI, BPSK, OJK atau BPKN sehingga konsumen terhindar dari perilaku belanja impulsif yang merugikan.
Keyword: kelompok acuan, materialisme, media sosial, pembelian impulsif, perbandingan sosial

Judul: Development of DNA Vaccine Encoding Glycoprotein of Koi Herpes Virus Using Local Isolate.
Abstrak: The aim of this research was to develop DNA vaccine of Koi Herpesvirus in carp. Glycoprotein gene originated from ORF 25 KHV virus that is 1.8 kbp in size, is a potential gene in DNA vaccine construction. The sequencing and similarity analysis of the gene using BLAST software showed that this gene is a GP25 gene and was found to be very similar (99%) to GP25 of KHV virus from the USA and Israel. When this GP25 gene was ligated with pGEMT Easy (pT, 3 kbp in size) vector, plasmid size was increasing up to 5 kb. Following this, a digestion of pT-GP25 plasmid using Sal I enzyme was applied resulted in a GP25 fragment (1.8 kbp). Subsequently, pAct-D6 with a size of 8.5 kbp was also cut using the same enzyme to eleminate a D6 gene with a size of 1.6 kbp. GP25 gene was then ligated with pAct resulted a pAct-GP25 plasmid with a size of 8.8 kbp. As there was only one restriction site applied, ligation can be occurred in two different directions. Thus, in order to determine the plasmid with the desired direction PCR analysis was carried out, and plasmid with the right direction was the one that sized approximately 2.1 kbp (no. 6, 17 and 20). High level of GFP gene expression was detected in all tissues analyzed, i.e. kidney, gil, spleen, and muscle 24 hours after injection which indicated that β-actin promoter of Japanese medaka could be active in common carp. Although not as high as on 24 hours, expression was still detected until day 7 and disappeared after day 28 post injection indicating that pAct-GFP can be remained and β-actin promoter of Japanese medaka can be active in muscle, gills and kidney at least a week after injection. The result of RT-PCR analysis on pAct-GP25 injected common carp showed that GP25 gene expression can be detected 14 days after injection in all tissues observed. The expression level differences between GFP and GP25 genes possibly related to the primer sensitivity on annealing process to cDNA template and the size of PCR targeted DNA fragment, as smaller PCR targeted product will be easier to be amplified than a bigger one. The length of PCR targeted DNA with GP25 primer was 1.8 kbp whereas GFP gene was 0.6 kbp.The challenge test on common carp results showed that all unvaccinated and negative control (not infected with KHV) was alive until the end of the experiment. Whereas, the survival of fish vaccinated with a dose of 12.5 was ranged from 60.9 and 96.7%. In relation to the activity of β-actin promoter that was used in this DNA vaccine, gene expression was occured 24 hours after vaccination and remained until 2 weeks. The control fish that was not injected by GP25 showed no GP25 expression either in the observed tissues or organs and resulted in a lower survival, i.e. 23.3%. The challenge test results has indicated that the fish vaccinated with GP25 at doses of 7.5 and 12.5 μg/100μL were able to produce KHV glycoprotein in their body which would be
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