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: Kolonisasi dan proliferasi sel testikular ikan nila putih yang ditransplantasikan ke ikan nila hitam triploid
Abstrak: The technology of fish testicular cells transplantation had been established to create a surrogate broodstock. This technology can also be utilized to generate YY-progenies that are useful to produce all-male fish. In this study, as a first step towards all-male tilapia production, white Nile tilapia testicular cells was transplanted into peritoneal cavity of triploid black tilapia larvae. A specific primer was designed to identify colonization and proliferation of transplanted cells in recipient fish using PCR method. Analysis of gonadosomatic index (GSI) was also performed to determine the transplanted cells proliferation in recipient gonad. The result of PCR analysis showed a specific DNA amplification product in the gonad of transplanted fish. The specific DNA donor was detected on the recipient gonad 90 dpt (days post transplantation) and it was not detected on 30 and 60 dpt. The GSI analysis showed that GSI recipient was increased and relatively similar with diploid non-transplanted Nile tilapia and it was higher than triploid non-transplanted Nile tilapia. These results showed that the donor cell could be colonized and proliferated in triploid black tilapia gonad. Thus, it is likely to obtain a broodstock that is able to produce donor-derived gamete in the near future.
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