Judul: Pengaruh Prahidrolisa dan variasi umur kayu Paraserianthes falcataria L. Nielsen terhadap mutu pulp rayon
Abstrak: Pembuatan pulp rayon pada dasarnya sama dengan pembuatan pulp kertas, akan tetapi pulp rayon lebih mengutamakan kurmurnian pulp yang tinggi.
Keyword: pulp rayon

Judul: Pengaruh Suhu Prahidrolisis Pada Serpih Kayu Terhadap Sifat Pulp Dissolving Rayon
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh suhu prahidrolisa dengan menggunakan air terhadap kualitas "pulp dissolving" yang dihasilkan, dan mencari kondisi optimal untuk menghasilkan kualitas "pulp dissolving" yang terbaik. Pembuatan "pulp dissolving" untuk rayon pada penelitian ini menggunakan bahan berupa tiga jenis kayu daun lebar yaitu Accacia auriculiformis, Eucalyptus saligna, Eucalyptus platiphyla yang mengalami proses prahidrolisa pada suhu 150°C dan 157°C kemudian dilanjutkan dengan pemasakan yaitu meng gunakan proses sulfat pada kondisi aktif alkali 15%, sulfi- ditas 30%, perbandingan larutan pemasak dengan kayu 4: 1, suhu maksimum 160°C dan lama pemasakan 3.5 jam dimana 1.5 jam mengalami pemasakan pada suhu maksimum. Pulp kemudian mengalami proses pemutihan dengan lima tingkat pemutihan yaitu C (klorinasi), E (ekstraksi alkali), H (hipoklorit), E (ekstraksi alkali) dan H (hipoklorit). Dalam penelitian ini dilakukan pengujian terhadap sifat kimia "pulp dissolving" yang dihasilkan yaitu alpa selulosa, beta dan gamma selulosa, pentosan dan derajat polimer. Penentuan kadar alpa selulosa, beta dan gamma selulosa dilaku- kan menurut SII 0443-81, sedangkan penentuan kadar pentosan ..dst
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Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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