Judul: Inventory of Parasitic Nematodes of Chrysanthemum  Plants in the Kebun Mandiri Florist, Cidahu District, Bogor Regency, West Java
Abstrak: Krisan (Chrysanthemum spp.) merupakan komoditas florikultura dengan produksi dan volume ekspor tertinggi dari tanaman hias lainnya di Indonesia. Hama dan penyakit tanaman menjadi faktor penghambat utama dalam budidaya krisan, salah satunya adalah nematoda parasit (fitonematoda). Penelitian bertujuan menginventarisasi dan mengidentifikasi fitonematoda yang berasosiasi dengan tanaman krisan di Kebun Mandiri Florist. Pengambilan sampel tanah dan akar dilakukan pada umur 13, 15, dan 16 MST (minggu setelah tanam). Nematoda diekstraksi dari sampel tanah dengan metode flotasi-sentrifugasi dan sampel akar dengan metode pengabutan (mist chamber). Identifikasi morfologi nematoda berdasarkan pada karakteristik anterior (bentuk mulut dan stilet), posterior (bentuk ekor dan organ reproduksi), serta anulasi tubuh nematoda. Pengukuran karakter morfometrik dilakukan mengacu pada formula J G De Man. Data morfometrik nematoda ditabulasikan dengan Microsoft Excel 2019. Empat genus yang diidentifikasi, yaitu Pratylenchus, Rotylenchulus, Tylenchus, dan Coslenchus. Fitonematoda yang dominan pada krisan adalah Pratylenchus dengan populasi absolut mencapai 9737,78/4 g akar dan frekuensi absolut 100% pada semua umur dan derajat kesehatan tanaman., Chrysanthemum (Chrysanthemum spp.) is the flower with the highest production and export volume compared to other types of flowers in Indonesia. Pests and diseases are the causes of sub-optimal flower production, one of which is plant parasitic nematodes. The research aimed to make an inventory and identify plant-parasitic nematodes associated with chrysanthemum plants in Kebun Mandiri Florist. Soil and root samples were collected at 13, 15, and 16 WAP (weeks after planting). Nematodes were extracted from soil samples using the flotation centrifugation method, and from root samples using the mist chamber method. The morphological identification of nematodes was based on anterior characteristics (mouth and stylet shape), posterior characteristics (tail shape and reproductive organs), and body annulation. Measurements of morphometric characters were carried out in reference to the J G De Man formula. Nematode morphometric data was tabulated with Microsoft Excel 2019. Four genera were identified: that are Pratylenchus, Rotylenchulus, Tylenchus, and Coslenchus. The dominant phytomatode in chrysanthemums was Pratylenchus with an absolute population reaching 9737,78/4 g of roots and an abolute frequency of 100% at all ages and degrees of plant health.
Keyword: frekuensi absolut, morfologi, morfometri, absolute frequency, morphology, morphometry

Judul: Deteksi dan ldentifikasi Nematoda Puru Akar pada Tanaman Krisan Berdasarkan Karakter Morfologi dan Molekuler
Abstrak: Chrysanthemum (Dendranthema grandiflorum Tzvelev) is a horticultural commodity that has significant economic value for Indonesia. One of the constraints in the production of chrysanthemum is infection of root knot nematodes (Meloidogyne spp.). The objective of this research was to identify species of Meloidogyne associated with chrysanthemum in West Java based on morphological and molecular characters. Morphological identification method is based on the shape and size of eggs, second stage juveniles, males and females perineal pattern of nematodes. Molecular identification was done through polymerase chain reaction (PCR) using primer pairs specific to M. incognita, M. javanica and M. arenaria. The result showed identification morphologically was found three species of Meloidogyne namely M. javanica, M. incognita and M. arenaria based on the molecular characterization, M. javanica is the only one of species that associated with chrysanthemum in West Java.
Keyword: 

Judul: Sintesis BaTiO3 dari Campuran Ba(OH)2 dan TiO2 dengan Tambahan PbO
Abstrak: Piezoelectric material can generate electric field in response to applied mechanical stress. Conversely, they can stretch and contract in response to an electric field. This material can be used for many applications such as transducer, microphone, ultrasound, and pressure gauge. Barium titanate is a ferroelectric material with piezoelectric properties that can be synthesized easily. The aim of this study is to synthesis barium titanate from mixture of Ba(OH)2 and TiO2, also observe its optimum temperature and the effect of PbO addition. The method of synthesis was solid-state reaction and sol-gel method, then the products were characterized with x-ray diffraction (XRD). Based on XRD analysis, the optimum temperature for both methods was 800°C. Addition of PbO to BaTiO3 in the solid-state reaction formed a compound with formula of Ba1-xPbxTiO3. The addition has changed diffraction pattern peak at 2θ and strengthened its tetragonal structure. The best result was obtained at x of 0.5 which will form a compound of Ba0.5Pb0.5TiO3.
Keyword: