Judul: Pengaruh Perilaku Bermain Video Game Berunsur Kekerasan Terhadap Perilaku Agresi Remaja
Abstrak: Perkembangan teknologi saat ini begitu pesat, perkembangan ini mempengaruhi media audio visual salah satunya adalah video game. Tujuan dari penelitian ini yaitu: 1) Menganalisis perbedaan pengaruh tingkat bermain video game berunsur kekerasan terhadap tingkat perilaku agresi remaja, 2) Menganalisis perbedaan pengaruh faktor personal sebagai pembentuk perilaku bermain video game berunsur kekerasan terhadap tingkat perilaku agresi remaja, 3) Menganalisis perbedaan pengaruh faktor situasional sebagai pembentuk perilaku bermain video game berunsur kekerasan terhadap tingkat perilaku agresi remaja. Analisis dalam penelitian ini menggunakan tabulasi silang, uji statistik Mann-Whitney dan Kruskall-Wallis dengan taraf nyata 5%. Hasil penelitian menunjukkan bahwa terdapat perbedaan tingkat situasional dan perbedaan jenis kelamin terhadap tingkat perilaku bermain video game berunsur kekerasan; dan terdapat perbedaan tingkat perilaku bermain video game berunsur kekerasan terhadap tingkat agresivitas remaja.
Keyword: perkembangan teknologi, media audio visual, kekerasan dalam video game.

Judul: Pengaruh Kekerasan oleh Orang Tua dan Teman Sebaya, Penghargaan Diri, dan Kontrol Diri terhadap Perilaku Agresif Remaja SMK
Abstrak: Perilaku agresivitas merupakan suatu tindakan seseorang yang bertujuan untuk menyakiti dan merugikan orang lain baik secara verbal maupun fisik. Tujuan utama pada penelitian ini adalah untuk menganalisis pengaruh kekerasan yang dilakukan oleh orang tua dan teman sebaya, penghargaan diri, dan kontrol diri terhadap perilaku agresivitas. Penelitian ini menggunakan desain cross-sectional study. Pengambilan contoh dilakukan menggunakan non-probability sampling dengan teknik voluntary sampling. Penelitian ini dilakukan pada 120 remaja SMK yang memiliki keluarga utuh dan tinggal bersama di Kota Bogor. Pengumpulan data ini menggunakan teknik survei. Penelitian ini dianalisis menggunakan model persamaan struktual. Hasil penelitian mengungkapkan bahwa kekerasan yang dilakukan oleh orang tua dan teman sebaya memiliki pengaruh langsung dan tidak langsung secara positif signifikan terhadap perilaku agresivitas remaja. Sementara itu, penghargaan diri dan kontrol diri memiliki pengaruh langsung secara negatif signifikan terhadap perilaku agresivitas. Diharapkan orang tua serta pihak sekolah dapat menjadi panutan (role model) bagi remaja serta dapat bekerja sama dalam mendidik anak secara positif. Promosi secara daring (online) dengan menggunakan pemengaruh (influencer) terkait dengan pengasuhan positif perlu dilakukan
Keyword: aggressive behavior, self-control, self-esteem, violence perpetrated by father, mother, peers

Judul: Extracellular Expression of thermostable Geobacillus stearothermophilus T1.2RQ Lipase for Biodiesel Production
Abstrak: The extracellular expression of enzymes in an excellent secretion host such as Bacillus subtilis is a useful strategy for making enzymes of industrial significance more affordable by lowering the cost of its downstream processing. Lipases are a category of hydrolases that catalyze the hydrolysis of triglycerides to glycerol and free fatty acids. Also, lipases catalyze the hydrolysis and transesterification of other esters as well as the synthesis of esters. They can perform very specific biotransformation reactions and are widely used in food, organic synthesis, detergents, cosmetic, and pharmaceutical industries. Geobacillus stearothermophilus T1.2RQ lipase is an industrially-desired thermostable lipolytic enzyme with an excellent hydrolytic and transesterification activity. This study aimed to express T1.2RQ lipase, in B. subtilis WB800 and ensure its secretion into the extracellular medium. Three signal peptides (AmyQ, Epr, LipA) and two promoters (Pgrac01 and Pgrac100) were used in the secretory-expression of T1.2RQ lipase, based on five constructed expression vectors constructed by restriction cloning and PCR mutagenesis. Sangers sequencing was used to verify constructs to ensure they are in the correct reading frame. Recombinants vectors, pHT43 (plasmid control), pHT43-T1.2RQ, pHT43- T1.2RQ_AmyQ, pHT43-T1.2RQ_Epr, and pHT43-T1.2RQ_LipA, were transformed by electroporation into Bacillus subtilis WB800. The electroporation was successful with the optimum condition of 2500V, 200 ohms, 25µF, and 5milliseconds. Recombinant B. subtilis pHT43 (negative control) and pHT43-T1.2RQlip + signal peptides were streaked on the lipidic agar, LA+TBN. All four recombinants, including the negative control (B. subtilis WB800-pHT43), produced clear zones on the TBN agar plate after overnight incubation (fig 2), indicating the presence of a lipolytic enzyme in all of the recombinant B. subtilis cells. pHT43-T1.2RQlip + signal peptides (AmyQ, Epr, and LipA) have clear zones with significantly higher diameters than B. subtilis WB800-pHT43 (negative control). This phenomenon suggests that the recombinant thermostable lipase T1.2RQ introduced into these cells was successfully expressed, thereby increasing the lipolytic capability of its host cells T1.2RQ lipase was expressed in 50ml terrific broth medium (TB) and the expression induced with 1mM IPTG. Lipase activity assay using p-nitrophenyl esters showed that all three signal peptides directed the secretion of T1.2RQ lipase into the extracellular medium. Signal peptide, LipA, resulted in the highest extracellular activity of 5.6 U/mL, which corresponds to a 6-fold increase over the parent B. subtilis WB800 strain. Meanwhile, signal peptides, AmyQ and Epr produced 4.2 U/mL and 3.4 U/mL activity respectively. SDS-Zymogram analysis confirmed that T1.2RQ lipase was correctly processed and secreted in its original size of 44 kDa. An attempt to further increase lipase expression level by promoter optimization showed that, contrary to expectation, promoter Pgrac100 exhibited similar expression levels as the original Pgrac01. Nevertheless, the demonstration of the successful secretion of T1.2RQ lipase in this work confirms the latter as a promising approach for the industrial production of the enzyme
Keyword: Bacillus subtilis, Expression, Extracellular, Heterologous, Lipase, Thermostable