Judul: Hubungan Distribusi Aerosol Dengan Ketinggian Planetary Boundary Layer (Studi Kasus: Riau Dan Sekitarnya).
Abstrak: Kebakaran sering terjadi di wilayah Indonesia, seperti di Sumatera dan Kalimantan sehingga menjadi salah satu indikasi penyebab dari adanya sebaran aerosol di atmosfer. Aerosol Optical Depth (AOD) merupakan tingginya aerosol dalam satu kolom sampai puncak atmosfer. AOD sebagai indeks ketebalan optik aerosol diasumsikan sebagai tebal aerosol yang ada di suatu lapisan udara dan berkontribusi dalam pengurangan radiasi matahari ke permukaan bumi. Berkurangnya panas yang diterima permukaan bumi berpengaruh pada penurunan suhu yang berakibat pada proses berkurangnya tinggi planetary boundary layer yang faktor berpengaruhnya berupa thermal (suhu), shear wind, letak topografi, dll. Sehingga hubungan yang terjadi pada AOD dengan tinggi planetary boundary layer adalah negatif karena semakin tebalnya AOD di suatu lapisan udara, maka tinggi planetary boundary layer akan semakin rendah, sedangkan semakin tipisnya AOD, maka tinggi planetary boundary layer akan semakin tinggi.
Keyword: Planetary Boundary Layer, metode empiris, AOD, ketebalan optik aerosol, citra MODIS, kebakaran hutan gambut

Judul: Spatial Analysis of Aerosol Optical Depth (AOD) Based on Precipitation and Wind Variation Over Western Region of Java
Abstrak: Kualitas udara di wilayah Jawa Bagian Barat dipengaruhi secara dinamis melalui perubahan lingkungan akibat tingginya aktivitas antropogenik. Aerosol sebagai partikulat padat yang mempengaruhi kualitas udara, cuaca, dan iklim, dapat diestimasi melalui parameter Aerosol Optical Depth (AOD) yang menggambarkan beban aerosol dalam kolom atmosfer. Penelitian ini menganalisis karakteristik spasial AOD dan mengeksplorasi keterkaitan curah hujan dan pola angin terhadap distribusi AOD pada musim basah dan musim kering melalui analisis regresi spasial. Hasil penelitian menunjukkan secara statistik, besar kelajuan angin tidak berpengaruh signifikan terhadap nilai AOD. Namun, arah angin terlihat mempunyai pengaruh terhadap distribusi curah hujan dan AOD yang terkait dengan sistem monsun. Analisis regresi spasial pada musim hujan (periode DJF-MAM) menunjukkan bahwa curah hujan tidak berpengaruh signifikan terhadap AOD (p-value > 0,05). Kurangnya pengaruh yang signifikan pada musim hujan disebabkan oleh tingginya intensitas dan curah hujan menyebar luas, yang secara efektif menghilangkan aerosol dari atmosfer. Sebaliknya, saat musim kering terdapat pengaruh signifikan curah hujan terhadap distribusi spasial AOD (p-value < 0,05). Distribusi spasial AOD dapat dijelaskan oleh pola spasial curah hujan dengan R² sebesar 32% pada model Ordinary Least Squares (OLS) dan 84% pada model Spatial Lag Model (SLM). Secara keseluruhan, penelitian ini menekankan interaksi kompleks antara faktor meteorologi dan aerosol dalam konteks musiman yang berbeda., Air quality in the Western Region of Java Island is dynamically influenced by environmental changes resulting from anthropogenic activities. Aerosols, as solid particulates that affect air quality, weather, and climate, can be estimated using the parameter Aerosol Optical Depth (AOD), which represents the aerosol load in the atmospheric column. This study analyzes the spatial characteristics of AOD and explores the influence of rainfall and wind patterns on the AOD distribution based on wet and dry season through spatial regression analysis. The research results show that statistically, wind speed has no significance on the AOD value. However, the wind direction appears to have an influence on the distribution of precipitation and AOD associated with the monsoon system. Spatial regression analysis in the wet season (DJF-MAM period) shows that precipitation does not significantly influence AOD (p-value > 0.05). The significant lack of influence in wet season is due to the high intensity and widespread nature of precipitation, which effectively scavenges aerosols from the atmosphere. In contrast, during the dry season, precipitation significantly influences the spatial pattern of AOD (p-value < 0.05). The spatial distribution of AOD can be explained by the spatial pattern of precipitation with an R² of 32% in the Ordinary Least Squares (OLS) model and 84% in the Spatial Lag Model (SLM). Overall, this research highlight the complex interplay between meteorological factors and aerosol in different seasonal context.
Keyword: precipitation, spatial regression, AOD, wind pattern

Judul: Peptides Hydrolysate Derived from Collagen of Snakehead Murrel (Channa striata) Skin Demonstrate Anti-oxidant and Anti-cholesterol Activities.
Abstrak: Anti-cholesterol and anti-oxidant play crucial role to combat cardiovascular disease (CVD) related to formation of arterial plagues from oxidation of cholesterol. In the past decades, research on bioactive peptides demonstrating anti-cholesterol and anti-oxidant activities have been reported as the alternative drugs. In this study, acid soluble collagen was extracted from the skin of snakehead murrel and employed to induce production of collagenase by Bacillus licheniformis F11.4. The collagenases secreted were in turn purified through AKTA Purifier (ion exchange, DEAE column) and used to produce peptides hydrolysate. The purified enzymes were grouped in two distinct collagenase fractions, designated as fraction D and F. Peptides hydrolysate produced by the fraction D was found to demonstrate HMG-CoA inhibitor activity comparable to pravastatin and limited anti-oxidant activity. Meanwhile, peptides hydrolysate generated using the fraction F demonstrated anti-oxidant activity comparable to BHT (2mM), vitamin C (2mM) and vitamin E (2mM), but limited HMG-CoA activity. Combination of the fraction D and F resulted in substantial HMG-CoA inhibition and anti-oxidant activities.
Keyword: Anti-cholesterol, anti-oxidant, bioactive peptide, collagen, collagenase, snakehead murrel