Judul: Distribusi Spasial dan Struktur Komunitas Gastropoda di Pulau Kelapa, Kepulauan Seribu.
Abstrak: Gastropoda merupakan hewan yang memiliki anggota terbanyak dari filum moluska yang mempunyai kemampuan adaptasi yang tinggi dengan berbagai tipe habitat. Pulau Kelapa memiliki area pantai berpasir, area tersebut merupakan salah satu habitat yang sesuai bagi kelas gastropoda di zona intertidal. Penelitian ini bertujuan mengetahui distribusi spasial dan struktur komunitas gastropoda di wilayah tersebut. Penelitian dilakukan pada empat stasiun, dimana pada setiap stasiun terbagi menjadi 3 substasiun, pengambilan sampel gastropoda dilakukan menggunakan metode transek kuadrat ukuran 1x1 m2. Hasil penelitian menunjukkan bahwa gastropoda yang ditemukan terdiri dari 11 famili, 13 genera dan 20 jenis. Spesies dengan kepadatan tertinggi adalah Cerithidea cingulata dan Cerithidea quadrata. Secara keseluruhan, nilai keanekaragaman cenderung sedang dengan indeks keseragaman tinggi dan indeks dominasi rendah pada keempat stasiun. Hasil analisis korespondensi menunjukkan adanya kecenderungan gastropoda menyukai habitat berpasir dan ditumbuhi makroalga, memiliki C-organik substrat yang tinggi dan kondisi kualitas air yang baik untuk kehidupan gastropoda. Distribusi spasial gastropoda dipengaruhi oleh kombinasi karakteristik perairan, substrat dasar dan juga tutupan substrat.
Keyword: distribusi spasial, gastropoda, Pulau Kelapa, struktur komunitas

Judul: Diversity and Association of Gastropods in the Seagrass Ecosystem on Tidung Kecil Island, Seribu Islands.
Abstrak: Gastropoda berperan dalam proses dekomposisi dan kestabilan ekosistem. Penelitian ini bertujuan menganalisis keanekaragaman dan asosiasi gastropoda pada ekosistem lamun Pulau Tidung Kecil, Kepulauan Seribu. Pengamatan menggunakan metode Seagrass Watch di empat stasiun ekosistem lamun. Tiap stasiun diukur parameter lingkungan perairan dan sedimen. Gastropoda yang ditemukan terdiri dari 53 spesies yang tergolong dalam 13 famili dengan kepadatan tertinggi di seluruh stasiun dimiliki oleh famili Cerithiidae yaitu 1503 ind/m2. Spesies dengan nilai kepadatan tertinggi adalah Cerithium punctatum di Stasiun 3 sebesar 303 ind/m2. Spesies lamun yang ditemukan yaitu Thalassia hemprichii, Enhalus acoroides, Cymodocea rotundata, dan Halophila ovalis. Kualitas perairan di ekosistem lamun masih berada dalam baku mutu gastropoda dengan substrat didominasi pasir. Analisis korespondensi (CA) menunjukkan terdapat tiga kelompok utama asosiasi gastropoda dengan vegetasi lamun. Komposisi gastropoda pada lamun jenis T. hemprichii dan lamun campuran memiliki nilai tertinggi. Analisis korelasi Pearson menunjukkan kerapatan lamun dengan kepadatan gastropoda memiliki hubungan sangat kuat dan searah., Gastropods significantly contribute to ecosystem stability and decompositions. This study examines the diversity and association of gastropods in seagrass ecosystem of Tidung Kecil Island, Seribu Islands. Observations were conducted at four stations using the Seagrass Watch method, measuring aquatic and sedimentary parameters. Gastropods found consisted of 53 species from 13 families with the highest density throughout the stations is Cerithiidae of 1503 ind/m2. The species with the highest density value is Cerithium punctatum at Station 3 of 303 ind/m2. Seagrass species found were Thalassia hemprichii, Enhalus acoroides, Cymodocea rotundata, and Halophila ovalis. The water quality in the seagrass ecosystem aligns with the gastropod life standards with sand-dominated substrate. The results of correspondence analysis (CA) revealed three main groups of gastropod associations with seagrass vegetation. The composition of gastropods in T. hemprichii seagrass and mixed seagrass has the highest value. Pearson correlation showed that seagrass density and gastropod density have a very strong and proportional relationship.
Keyword: association, diversity, gastropods, seagrass

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell