Judul: Biosystematics of pandanaceae in Java
Abstrak: Pandan family (Pandanaceae) is represented in Java by two genera, Freycinetia Gaud. and Pandanus Parkins. Since the studies by Backer and Bakhuizen van den Brink in 1968 and Stone in 1972, there were no further exploration on the pandan flora of the island have been made, thus the pandan flora remains largely unknown. Taxonomical problem as far as the Java pandans concerned, are centered not only on the species status of Pandanus odoratissimus L.f and P. tecrorius var. littoralis which are considered as synonym, but also the species status which are given as synonym of Pandanus furcatus Roxb. by Backer and Bakhuizen van den Brink. Under the latter they included of P. bantamensis Koord., P. oviger Martelli, P. pseudolais Warb., and P. scabrifolius Martelli into one species of P. furcatus Roxb. This classification is in contrast with Stone who stated that these species were regarded as four different species. Therefore an effort has been made to redescribe these species in detail, using morphological, anatomical and molecular data such as sequence data of atpB-rbcL IGS to provide better understanding of morphological, anatomical and molecular characters in supporting taxa delimitation and its distribution in Java.
Keyword: Pandanaceae, Freycinetia Gaud, Pandanus Parkins

Judul: Freycinetia (pandanaceae) of Sumatra
Abstrak: Freycinetia Gaud is one of four extant genera of Pandanaceae. The genus consists of approximately 200 species, in which almost all are climbers. The genus is distributed from Sri Lanka through the mainland of South East Asia and Malesia florictic region to northern Australia (Queensland) and New Zealand, there it is the only member of Pandanaceae existed.
Keyword: Morphological Study, Anatomical Study, Spatial Modelling

Judul: Sintesis layered double  hydroxide (LDH) dan aplikasinya sebagai adsorben kromium heksavalen (Cr(VI))
Abstrak: Layered double hydroxide (LDH) merupakan material hidrotalsit yang dapat berperan sebagai adsorben ion Cr(VI) melalui mekanisme tukar anion, adsorpsi-reduksi, dan interaksi elektrostatik. LDH MgAl dan MgAlFe disintesis menggunakan metode kopresipitasi dengan rasio molar M2+:M3+ sebesar 9:4,5. Hasil difraktogram XRD LDH MgAlFe menunjukkan terbentuknya fase hidrotalsit dengan puncak basal d003 mengalami pergeseran ke daerah 2θ yang lebih besar dibandingkan LDH MgAl, hal ini menandakan berkurangnya ukuran spesi basal dari LDH MgAlFe. Studi skala laboratorium dilakukan dalam mengkaji dosis dan profil isoterm adsorpsi dari LDH sebagai adsorben Cr(VI) yang dilakukan pada pH 4. Aplikasi LDH sebagai adsorben ion Cr(VI) menggunakan dosis optimum 12,5 mg/mL. Profil adsorpsi LDH MgAl mengikuti model isoterm Langmuir dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 45,95 mg.g-1, sedangkan profil adsorpsi LDH MgAlFe mengikuti model isoterm Freundlich dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 37,54 mg.g-1. Hasil adsorpsi menunjukkan bahwa LDH MgAl dan MgAlFe dapat berfungsi sebagai adsorben potensial dalam penanganan limbah ion Cr(VI)., Layered double hydroxide (LDH) is a hydrotalcite material that can serve as a Cr(VI) adsorbent through anion exchange, adsorption-reduction, and electrostatic interaction mechanisms. LDH of MgAl and MgAlFe materials were synthesized using the coprecipitation method with a M2+:M3+ molar ratio of 9:4,5. The results of the XRD diffractogram of LDH MgAlFe showed the formation of a hydrotalcite phase with a basal peak of d003 shifting to an area 2θ larger than that of LDH MgAl, which indicated a reduction in the basal spacing of LDH MgAlFe. A laboratory study was conducted to examine the dose and profile of the adsorption isotherm of LDH as Cr(VI) adsorbent at pH 4.The LDH can adsorb Cr(VI) at the optimum dose of 12.5 mg/mL. The LDH MgAl adsorption profile followed the Langmuir model has a maximum adsorption capacity (Qm) value of 45.95 mg.g-1. The MgAlFe LDH adsorption profile followed the Freundlich model has a maximum adsorption capacity (Qm) value of 37.54 mg.g-1. The adsorption results show that LDH MgAl and MgAlFe can function as promising adsorbents for treating Cr(VI) waste.
Keyword: isoterm adsorpsi, kromium heksavalen, layered double hydroxide, limbah ion logam