Judul: Aktivitas Ekstrak Daun Pelawan Dalam Memperbaiki Kinerja Ovarium Dan Involusi Uterus Pascamelahirkan
Abstrak: Pelawan leaf extract from Myrtaceae family contains bioactive compounds such as flavonoids, alkaloid, tannin, phenol, and steroid. The objective of the study was to analyze antioxidant activity from ethanol extract and extract fraction of Pelawan leaf. Antioxidant activity was measured using DPPH (2,2-diphenyl-1-picryl-hydrazylhydrate) radical photometric assays in a process guided by the discoloration. Pelawan (Tristaniopsis obovata Benn.) leaf simplicial was macerated with 70% ethanol to obtain ethanol extract, then were partitioned with n-Hexane, ethyl acetone, and water solvents to obtain the fraction of hexane, ethyl acetate, and water extracts. Antioxidant activity of ethanol and fraction of Pelawan extract were analyzed using DPPH method. The results showed that IC50 value of ethanolic Pelawan extract was lower than the other three extract fractions. Among the partitions, ethyl acetate and water fractions had higher antioxidant activity (AA) than hexane fraction. This study showed that ethanol, ethyl acetate, and water fraction extracts have high antioxidant activities as a potential nutrient and treatment material., Pelawan leaves contain steroids that can affect the female reproductive system. The aim of this study was to examine the effectivity of Pelawan ethyl acetate fraction extract on ovarian physiology of postpartum rat, based on the prediction of the litter size, birth weight, estrogen levels, and ovarian weight. The treatment was divided into the group of maternal rats giving birth once and giving birth twice. Each treatment consisted of control without Pelawan extract, maternal rats administered orally with Pelawan extract at doses of 50 mg/kg BW, 100 mg/kg BW, and 150 mg/kg BW. The results showed that the litter size and birth weight of baby rats born to maternal rats giving birth twice increased in the maternal rats treated with ethyl acetate fraction at a dose of 50 mg. The litter size and birth weight of baby rats born to maternal rats giving birth once decreased on maternal rats treated with ethyl acetate fraction at a dose of 100 mg. The estrogen concentration levels in all treatments decreased on day 3 and increased on day 5. The estrogen concentration levels in maternal rats treated with ethyl acetate fraction at a dose of 100 mg were higher than those in maternal rats treated at doses of 50 mg and 150 mg. The ovarian weight decreased on day 3 and increased on day 5. The ovarian weight of rats giving birth twice treated at a dose of 100 mg increased compared to the other doses. Pelawan extract has bioactive compounds that affect the litter size, birth weight, estrogen levels, and ovarian weight. Allegedly, the antioxidant compounds in the extract affect the performance of growth hormone and growth factors to produce LH and FSH in the pituitary, Ethyl acetate fraction of Pelawan extract has been tested to have steroid content and high antioxidant activity which can be used for treatment. The study examined the effect of ethyl acetate fraction of Pelawan extract in physiological repairing of postpartum rat uterus based on the activities of SOD, MDA, the expression of ER α, and Cu, Zn SOD. The treatment was divided into the group of maternal rats giving
Keyword: antioxidant activity, DPPH, Myrtaceae, Tristaniopsis obovata

Judul: Peran Pemberian Ekstrak Tempe terhadap Organ Ovarium dan Uterus Tikus Betina Prapubertas
Abstrak: This research was conducted to study the potential of tempe phytoestrogen to the reproduction performance in female rats (Rattus norvergicus). There were 18 of 21-days old of female rats were divided into two groups, which were control group without given tempe extract and treatment group that has been given the tempe extract with a concentration of 0.25 gr everyday at the the age of 21-days old until 48 days-old. The female rats were sacrificed at the age of 28th, 42nd and 56th days-old to collect the samples of blood, ovarium and uterus. Parameter measured were the rate of estrogen hormone, wet and dry weight, water content, total of DNA and total of RNA. Data were analysed using Independent Samples T-Test method with 95% confidence interval. Result showed the increasing of wet and dry weight of ovarium and uterus in treatment group at the age of 42 days but there was no influence on the total of DNA and RNA of organs.
Keyword: estrogen, ovarium, phytoestrogen, total of DNA and RNA, uterus

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf