Judul: Phosphorus Dynamic Model of Situ Patenggang, Bandung Regency, Jawa Barat
Abstrak: Fosfor merupakan elemen yang biasa digunakan untuk menggambarkan kesuburan perairan. Namun, upaya mengkaji dinamika fosfor perairan tawar Indonesia menggunakan model relatif masih belum banyak dilakukan. Penelitian ini bertujuan membangun model dinamika fosfor di badan air Situ Patenggang. Contoh air dan sedimen diambil pada bulan Juni, Juli, dan Agustus 2022 di empat stasiun pengambilan. Berdasarkan potensi pengadukan, Situ Patenggang merupakan danau polymictic yang sering mengalami pengadukan massa air hingga ke dasar perairan. Rasio parameter besi dengan fosfat total, serta besi dengan sulfat menunjukkan bahwa desorpsi dan absorpsi fosfor kurang dipengaruhi oleh elemen besi dalam air. Hasil regresi linear menunjukkan bahwa oksigen terlarut dan alkalinitas di hipolimnion merupakan parameter kunci primer, serta oksigen terlarut epilimnion, curah hujan, dan kecepatan angin merupakan parameter kunci sekunder. Parameter kunci primer dan sekunder tersebut menjadi acuan dalam pembangunan model. Model dijalankan untuk mengekstrapolasi dinamika oksigen terlarut, alkalinitas, dan fosfat total untuk satu tahun berikutnya berdasarkan curah hujan dan kecepatan angin rata-rata yang telah dijadikan normal iklim. Hasil pemodelan menunjukkan bahwa dinamika fosfor secara tidak langsung ditentukan oleh fluktuasi curah hujan dan kecepatan angin., Phosphorus has been widely used to describe a water body’s trophic level. However, there are still few efforts to study the phosphorus dynamic of freshwater ecosystems in Indonesia by modeling. This study aims to build Situ Patenggang’s phosphorus dynamic model. Water and sediment samples were taken in June, July, and August 2022 with four sampling sites. Based on mixing potential, Situ Patenggang is a polymictic lake that frequently experiences entire water mixing from bottom to surface. Iron-total phosphate ratio and iron-sulfate ratio show that the phosphorus dynamic is not dependent on iron availability. Linear regression shows that primary key parameters consist of dissolved oxygen and alkalinity in the hypolimnion, on the other hand, secondary key parameters consist of dissolved oxygen in the epilimnion, rainfall, and wind speed. Model creation is based on primary and secondary key parameters. The model was run to approximate dissolved oxygen, alkalinity, and phosphorus data for the coming year based on rainfall and average wind speed that has been converted into climate normal. The simulation results show that the phosphorus dynamic is indirectly related to rainfall and wind speed fluctuations.
Keyword: meteorology, modeling, phosphorus dynamic, Situ Patenggang

Judul: Persebaran Fosfor Secara Spasial Di Perairan Waduk Jatigede, Kabupaten Sumedang, Jawa Barat
Abstrak: Akumulasi bahan organik yang tinggi ke dalam ekosistem perairan waduk akan meningkatkan ketersediaan nutrien salah satunya fosfor. Penelitian ini bertujuan menganalisis persebaran fosfor secara spasial dan faktor-faktor yang mempengaruhi keberadaan fosfor di Waduk Jatigede. Pengambilan contoh dilakukan pada bulan Februari hingga April 2021 pada enam stasiun pengamatan. Analisis data terdiri atas sebaran spasial horizontal dengan ArcMap 10.5, sebaran vertikal dengan Ocean Data View, analisis klaster, analisis komponen utama dan korelasi Pearson dengan perangkat lunak R Studio. Zona Waduk Jatigede terdiri dari Zona Riverine, Zona Transisi, dan Zona Lakustrin. Konsentrasi fosfor total berkisar antara 0,075˗0,130 mg L-1, sedangkan ortofosfat berkisar antara 0,004˗0,023 mg L-1. Sebaran fosfor total dan ortofosfat di lapisan epilimnion memiliki sebaran yang tertinggi di Zona Riverine. Sebaran fosfor total di lapisan hipolimnion dan sedimen memiliki sebaran yang tertinggi di Zona Lakustrin. Fosfor tersebar dengan merata, baik secara horizontal maupun vertikal dengan kecenderungan lebih tinggi di Zona Riverine dan lapisan epilimnion. Sebaran fosfor dipengaruhi parameter fisika dan kimia perairan yang terdiri atas parameter suhu, kekeruhan, pH, dan oksigen terlarut., The accumulation of high organic matter into the reservoir water ecosystem will increase the availability of nutrients, one of which is phosphorus. This study aims to analyze the spatial distribution of phosphorus and the factors that influence the presence of phosphorus in the Jatigede Reservoir. Sampling was carried out from February to April 2021 at six observation stations. Data analysis consisted of horizontal spatial distribution using ArcMap 10.5, vertical distribution using Ocean Data View, cluster analysis, principal component analysis and Pearson correlation with R Studio software. The Jatigede Reservoir Zone consists of the Riverine Zone, Transition Zone, and Lacustrin Zone. The total phosphorus concentration ranged from 0.075˗0.130 mg L-1, while orthophosphate ranged from 0.004˗0.023 mg L-1. The distribution of total phosphorus and orthophosphate in the epilimnion layer has the highest distribution in the Riverine Zone. The distribution of total phosphorus in the hypolimnion and sediment layers has the highest distribution in the Lacustrin Zone. Phosphorus is evenly distributed, both horizontally and vertically with the tendency to be higher in the Riverine Zone and the epilimnion layer. The distribution of phosphorus is influenced by physical and chemical parameters of the waters which consist of parameters of temperature, turbidity, pH, and dissolved oxygen
Keyword: fosfor, sebaran spasial, Waduk Jatigede, Zona Riverine

Judul: Onset, Durasi, dan Gejala Klinis Anestesi pada Kelinci New Zealand White (Oryctolagus cuniculus) dengan Kombinasi Ketamin-Xylazin Intramuskular
Abstrak: The aim of this research was to expound the onset, duration, and clinical signs observed on anaesthesia phase using ketamine-xylazine combination in New Zealand White rabbits. Fifteen New Zealand White rabbits (Oryctolagus cuniculus) were randomly subjected into three groups of five animals each. Those in group A were anaesthetized using a combination of 35 mg/kg ketamine and 5 mg/kg xylazine given i/m. Group B animals were anaesthetized using a combination of 40 mg/kg ketamine and 5 mg/kg xylazine while group C were anaesthetized using a combination of 45 mg/kg ketamine and 5 mg/kg xylazine, both given i/m. The result of this study indicated that the onset of anaesthesia marked by loss of pain response differ not significantly among the three groups (P < 0.05). Duration of anaesthesia and recovery significantly differ (P < 0.05) as the dose of ketamine increased. The onset of anaesthesia clinical signs within induction phase showed significant differences on sternal recumbency, lateral recumbency, and constricted pupil. Meanwhile the onset of anaesthesia clinical signs showed no significant differences (P<0.05) within recovery phase. It was concluded that onset of anaesthesia and clinical signs in induction phase were directly proportional as the ketamine’s dose increased. Meanwhile duration of anaesthesia and duration of recovery were inversely proportional with the dose increasing.
Keyword: anesthesia, ketamine-xylazine, New Zealand White, rabbit