Judul: A Monograph of the Genus Diplycosia (Ericaceae) in New Guinea
Abstrak: Diplycosia is an under-studied genus of Ericaceae, with a distribution confined almost to Malesia with most members are endemic to a single island or even a single mountain. New Guinea which, prior to this study, inhabited by 21 endemic species and once considered as one of the centres of diversity. Many species of Diplycosia in New Guinea are known only from limited collections: either only from the type specimens, or from only two or three specimens from a single or few locations; several have incomplete descriptions due to the absence of floral parts. Therefore, a taxonomic revision is needed for the genus Diplycosia in this island. Besides that, despite mostly being narrow endemic, 17 described species have not been evaluated for their IUCN conservation status which has become an obstacle for conservation actions. Therefore, an assessment is urgently required for the genus in New Guinea. A morphological species concept was used in this revision, and specimens were studied from various herbaria either directly or from digital resources: Australian National Herbarium (CANB), Harvard University (A), Muséum National d'Histoire Naturelle, Paris (P), Naturalis History Museum Firenze (FI), Naturalis Leiden (L), Papua New Guinea Forest Research Institute (LAE), PT Freeport Indonesia (tentatively as FRE), Research Center for Biology Indonesia Institute of Sciences (BO), Royal Botanic Gardens Kew (K), and Universitas Papua (MAN). Field explorations were carried out in Indonesian New Guinea, including Birds Head Peninsula and Mount Jaya area. An observation on qualitative anatomical characters of leaf epidermis was done in eight species. Assessment of conservation status was based on IUCN Red List guideline including range sizes calculated using GeoCAT using data sourced from herbarium specimens, literature and recently gathered data from the field exploration. A total number of 26 endemic species are accepted in New Guinea. Four new species are described namely Diplycosia elegans Mustaqim, Utteridge & Heatubun, D. hexamera Mustaqim, Utteridge & Heatubun, Diplycosia puradyatmikai Mustaqim, Utteridge & Heatubun, Diplycosia reticulifolia Mustaqim, Utteridge & Heatubun, together with a variety Diplycosia lorentzii var. acuminata Mustaqim, Utteridge & Heatubun. Diplycosia morobeensis var. ovatifolia Sleumer is reduced to a synonym of Diplycosia morobeensis Sleumer. Based on our current result, a higher number of species was reported from the western half of the island compared to the eastern half. So far, the central part of New Guinea from Jayawijaya Mountains east to the mountains near Indonesia and PNG border is an area with the highest diversity despite being poorly explored. The geographical range of the species varies from widespread species, found across the island, to very narrow endemics, some even restricted to a single mountain complex or a single locality. New Guinean Diplycosia grows as epiphytes or a terrestrial shrubs in mostly the mossy forests upwards to alpine vegetation. The elevation range from 800 in Wandammen Peninsula for D. kosteri and 4000 m in Mount Giluwe for D. rupicola and D. morobeensis. Seven species are known to inhabit alpine vegetation in New Guinea including the new species D. elegans. From this study, we recorded two new important information in the generic character of Diplycosia. It has been
Keyword: conservation status, East Malesia, epiphyte, Ericaceae, new species, taxonomy

Judul: Biosystematic Study of the Fern Genus Diplazium in West Malesia, Biosystematic Study of the Fern Genus Diplazium in West Malesia
Abstrak: Diplazium is a large genus consisting of about 400 species occur mainly in the tropics, sparingly in the subtropic and only locally extending into temperate. It was estimated that 300 species of the records were occurred in Malesia. Taxonomically, Diplazium is very difficult and quite insufficiently known. Therefore a comprehensive study on Diplazium in West Malesia was conducted by using morphological, ecological, geographic distribution, anatomical, palinological, cytological, as well as DNA analysis to understand the diversity and relationship among species. Based on gross morphological study on 1051 collection number of specimens as well as living collections, it was concluded that West Malesian Diplazium comprises of 69 species with 14 varieties. Thirteen species of them are proposed and described as new species, namely Diplazium asymmetricum, D. batuayauense, D. crameri, D. densisquamatum, D. halimunense, D. loerzingii, D. megasegmentum, D. megasimplicifolium, D. meijeri, D. parallelivenium, D. profluens, D. subalternisegmentum, and D. subvirescens. Two new varieties are poposed, namely D. accedens var. spinosum and D. silvaticum var. pinnae-ellipticum. D. pallidum var. montanum and D. accedens var. ridleyi are proposed as new status. Based on their main habitats, Diplazium can be classified into three major groups, viz. dryland (dominant), riparian and rheophytic species. Species diversity was culminated at 1000- 1500 m above sea level. The individuals with different genetic load in the same species sometimes grow in the different habitat gradients. Based on the range of the geographical distribution, West Malesian species can be divided into three types: (1) very wide species (19 species), (2) Malesian species (27 species), and (3) locally endemic species (23 species). Anatomical study on the transversal section of stipe of 27 species showed that the vascular bundle shape is varying among species. Therefore the leaf-trace shapes are important diagnostic features which support species delimitation in Diplazium. Spore morphology study showed that perine ornamentations support in delimitating species in Diplazium. However the phylogenetic analysis using parsimony revealed that morphological variation of spore is inadequate to depict natural relationship among Diplazium species. Cytological study on 117 collection number from 54 localities included in 31 species found that West Malesian Diplazium has six ploidy levels with x = 41 (diploid, triploid, tetraploid, pentaploid, hexaploid, and octoploid). New cytological information for science on 19 species are recorded. They are D. aequibasale (2n = 164), D. angustipinna (2n = 123). D. asymmetricum (2n = 123), D. batuayauense (2n = 164, 205), D. crenatoserratum (2n = 123, 164), D. halimunense (2n = 123), D. hewittii (2n = 123), D. profluens (2n = 164), D. loerzingii (2n = 82, 123), D. pallidum (2n = 82), D. petiolare (2n = 82), D. porphyrorachis (2n = 164), D. riparium (2n = 82, 123), D. spiniferum (2n = 82), D. subserratum (2n = 82, 123, 164), D. subvirescens (2n = 123), D. tomentosum (2n = 82, 205), D. xiphophyllum (2n = 82, 246), and D. wahauense (2n=164). Phylogenetic analysis on morphological data sets of 69 species using parsimony revealed that the phylogenetic relationship among species in the genus Diplazium was very difficult to explain due to the lack of or weak support
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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