Judul: Penentuan Masa Transisi Kayu Juvenil ke Kayu Dewasa pada Bagian Tengah Batang Sengon (Falcataria moluccana (Miq.) B. Grimes) dan Jabon (Anthocephalus cadamba Miq.)
Abstrak: Sc. Wood is an important forest resources which has been processed in large quantities to meet growing human needs. To meet the increasing demand for wood, wood supplies are able to be taken from fast-growing species planted in plantations and community forests. These fast growing species tend to be harvested in short rotation and have a high proportion of juvenile wood. The objective of this research is to determine the characteristics of juvenile wood in order to use wood Jabon and Sengon properly. The approach of segmented regression model is used to describe the development of juvenile wood to mature wood while non-linear procedures at the level of two orthogonal polynomial equation is used to identify the starting point of the formation of mature wood. To determine the transition of juvenile to mature wood in Sengon and Jabon, samples of two trees with ages 5, 6 and 7 years are taken from the community forest in Sukabumi. Disk with a thickness of 5 cm is taken at a height of 3.5 meters from each sample tree for measuring fiber length, MFA, density and moisture content. Wood moisture content from pith to bark is measure by using gravimetric method. Fiber length and MFA are measured on each circle grows as wide as 1 cm from pith to bark by using maceration and microtome technique. That was an analysis of segmented regression model in radial to fibers and MFA, showing that Sengon and Jabon wood were young wood until the age of 7 years. Fiber length and MFA were the best indicator to determine the transition from juvenile to mature wood, although the transition point varied to their properties. The proportion of juvenile wood on Sengon and Jabon wood at the age of 7 years were respectively 80-100% and 100%.
Keyword: juvenile wood, Microfibril angle

Judul: Penentuan Titik Transisi Kayu Juvenil ke Kayu Dewasa pada Sengon (Paraserianthes Falcataria (L.) Nielsen) dan Jabon (Anthocephalus Cadamba Miq.)
Abstrak: Wood as an important forest resource has been processed in large quantity to fulfill an increasing need of humans. To satisfy the increasing demand for the wood products, the supply of the wood will be come from fast-growing tree species grown on plantation forest and community forest. This fast-growing wood species will tend to be harvested in short age rotations and will contain higher proportions of juvenile wood. The objective of this research is to know characteristics of juvenile and to obtain consistent estimates of transition age from juvenile to mature wood of Sengon and Jabon woods. Segmented modeling approach was used to estimate the age of transition, and the non-linear procedure was employed to identify the juvenile to mature wood transition point. In an attempt to determine the juvenile and mature transition age for Sengon and Jabon, 6 trees were sampled in three age classes (5, 6, and 7 year) from a community forest in Sukabumi. Disks of 5 cm thick were collected at 1.3 meters (diameter breast height) from each tree to determine fiber length, MFA, density, and green-moisture content. Wood density was measured from pith to bark by X-ray densitometry. Fiber length and microfibril angle (MFA) were measured on isolated segmented rings of 1 cm width from pith to bark by visual interpretation on maceration and microtome samples. The segmented regression models and visual interpretation of tangential patterns of variation in fiber length and MFA reveal that juvenility in Sengon and Jabon extends up to 7 years, respectively. Fiber length and microfibril angle appear to be good anatomical indicators of age demarcation between juvenile and mature wood, although maturation age often varies among the properties. The projected figures for proportion of juvenile wood in Sengon and Jabon at age of 7 year are 80–100% and 100%, respectively.
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Judul: Trichomonas Gallinae Penyebab Trichomonosis Pada Unggas
Abstrak: Trichomonas gallinae adalah protozoa yang bergerak aktof dengan keempat flagella yang mempunyai layar dan pada salah satu sisinya terdapat membran seperti sirip ikan yang berombak. Spesies dari genus Trichomonas ini mempunyai arti penting pada unggas, karena dapat menyebabkan infeksi pada alat pencernaan bagian atas.
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