Judul: Waktu Kematangan Seksual Laki-laki Baduy, Desa Kanekes
Abstrak: Puberty is a complex process involving physical and psychological changes, leading to sexual maturation (menarche in females, spermarche in males). This is characterized by secondary sexual characteristics’ emergence. In males, it is marked by testicular enlargement, laryngeal prominences development, body hair growth, and voice breaking. Variations of sexual maturation age may reflect an adaptation to life history strategies in response to environmental constraints and energy availability. Unavailable data on sexual maturation in Baduy males makes it crucial for life history strategy research. This research was conducted in Baduy Luar from November 2022-February 2023. The study involved 180 subjects aged 6 to 30 years (median: 16.00±0.64 years). It showed that balig (13.11±0.249 years) is an important moment in Baduy males as it serves as a social indicator of their puberty. Subsequently, the sequence of secondary sexual characteristics includes voice breaking (13.36±0.270 years), facial hair growth (14.16±0.323 years), spermarche (15.21±0.261 years), and axillary hair (16.44±0.313 years). Baduy males demonstrate a slow life strategy as an adaptive response to their bioculture (high physical activity and different dietary lifestyles), resulting in energetic constraints. This condition indicates an energy allocation trade-off between growth completion and sexual maturation timing, potentially explaining the older age of their spermarche.
Keyword: Baduy people, life history, secondary sexual characteristics, sexual maturation, spermarche

Judul: Pola Pertumbuhan Pria Usia 4 sampai 21 Tahun di Suku Baduy, Desa Kanekes, Kecamatan Leuwidamar, Kabupaten Lebak, Banten
Abstrak: Growth is an increasing process of body size that follow a predictable pattern. Body size can be determined by calculating the Body Mass Index (BMI), which is the ratio of weight (kg) and the square of statures (m2). The growth pattern can be determined by connecting the median of each class of age. The research purpose was to find the body size growth pattern of male aged 4 to 21 years old in Suku Baduy. Even so, the growth velocity curve start at the same time, the statures growth velocity curve reach the peak first, then so do latter the weight growth velocity curve. The peak of BMI growth velocity curve happened in the age of 13 years old with the growth velocity was 0.804 kg/m2 per year. Based on the BMI value, the body size of male in Suku Baduy was small. This thing was happened due to the high level of physical activities.
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Judul: Potensi Zeolit Terimpregnasi Logam Kromium sebagai Katalis Konversi Glukosa menjadi 5-Hidroksimetilfurfural
Abstrak: Zeolit merupakan mineral aluminosilikat yang memiliki struktur berpori. Senyawa gula, seperti glukosa dan fruktosa, dapat dikonversi menjadi 5-hidroksimetilfurfural (HMF) dengan dikatalisis oleh zeolit. Namun, aktivitas katalisisnya sangat rendah terhadap glukosa. Aktivitas katalisis ini dapat ditingkatkan melalui impregnasi logam Cr(III). Penelitian ini bertujuan memodifikasi zeolit alam melalui impregnasi logam Cr dan menganalisis potensinya sebagai katalis konversi glukosa menjadi menjadi HMF. Impregnasi logam Cr dapat meningkatkan keasaman zeolit dan peningkatannya berbanding lurus dengan meningkatnya rendemen HMF yang dihasilkan. Optimisasi konsentrasi logam yang diimpregnasi tidak selalu berbanding lurus dengan meningkatnya rendemen HMF. Konsentrasi logam Cr yang terlalu tinggi dapat menurunkan rendemen akibat terjadinya reaksi samping. Campuran pelarut dapat digunakan dalam sintesis HMF untuk mengatasi sulitnya pemisahan pada penggunaan pelarut dimetil sulfoksida murni.
Keyword: 5-hidroksimetilfurfural, impregnasi, kromium, zeolit