Judul: Analisis Anatomi, Struktur Sekretori dan Uji Histokimia Tanaman Kenikir (Cosmos caudatus Kunth.).
Abstrak: Kenikir (Cosmos caudatus Kunth.) merupakan tanaman herba yang dapat tumbuh di wilayah Indonesia. Kenikir memiliki potensi untuk dikembangkan karena mengandung senyawa metabolit yang berfungsi sebagai obat. Penelitian ini bertujuan mempelajari struktur anatomi, dan struktur sekretori, serta mengetahui kandungan senyawa yang terdapat di dalamnya. Pengamatan struktur anatomi, sekretori, dan uji histokimia menggunakan tumbuhan yang ditanam di Tamansari, Kabupaten Bogor. Organ tumbuhan yang diamati meliputi daun, tangkai daun, dan batang. Analisis struktur anatomi daun menunjukkan bentuk sel epidermis tidak beraturan dengan dinding sel berlekuk dan tipe stomata anomositik. Hasil analisis anatomi pada tangkai daun dan batang terdiri atas epidermis, korteks, berkas pembuluh, dan empulur. Struktur sekretori yang ditemukan pada tanaman kenikir berupa trikoma kelenjar multiseluler tipe 1 yang memiliki bagian kepala berbentuk bulat tersusun oleh sekitar 16 – 32 sel, trikoma kelenjar multiseluler tipe 2 yang memiliki bagian kepala berbentuk bulat yang tersusun oleh sekitar 24 – 42 sel, trikoma kelenjar uniseriat tipe 1 berbentuk memanjang tersusun oleh satu sel basal dan 4 – 8 sel, dan trikoma kelenjar uniseriat tipe 2 berbentuk memanjang tersusun oleh satu sel basal dan 15 – 20 sel, serta sel idioblas. Uji histokimia menunjukkan senyawa metabolit sekunder yang terakumulasi pada trikoma berupa fenol, terpenoid, lipofilik, dan flavonoid, sedangkan pada sel idioblas yaitu fenol, terpenoid, dan flavonoid.
Keyword: Cosmos caudatus Kunth., sel idioblas, terpenoid, trikoma kelenjar

Judul: Kemiripan dan Potensi Produksi Aksesi Kenikir (Cosmos caudatus Kunth.) dari Beberapa Tempat di Jawa Barat
Abstrak: Kenikir has the potential to be developed as an alternative vegetable to meet market demand. However, in general, this kind of vegetable has not been widely known by the publican disusually found only in the local market. So far, there has been no research or information on the genetic diversity of this plant. It is, therefore, necessary to conduct the exploration activity to study the morphological characters of the kenikir in several areas in West Java. The objectives of this study were to observe similarity and production potential among the accessions of kenikir (Cosmos caudatus Kunth.) that has the potential to be developed in several places in West Java. This study consisted of two experiments. The first experiment was an exploration and similarity between accession of kenikir (Cosmos caudatus Kunth.) from several places in West Java. Observations were carried out based on the table characteristics of kenikir plant and cluster analysis was also conducted to determine the similarity among the kenikir accessions. The second experiment evaluated the production of several accessions of kenikir (Cosmos caudatus Kunth.) from several places in West Java. This experiment used a Randomized Complete Block Design with a single factor, namely 7 accession as a treatment. The results of the clusters analysis grouped 20 Cosmos accessions into three clusters. Cluster I and II consisted only one accession each which were AK 16 and AK14, respectively. Cluster III consisted of AK 9, AK 11, AK 10, AK 7, AK 8, AK 5, AK 6, AK 3, AK 19, AK 4, AK 3, AK 13, AK 20, AK 1, AK 18, AK 15, AK 2, AK 12 and AK 17. The main characteristic of cluster I were have spreading growth-type, strong stem anthocyanin colouration, ray florets tubular type and secondary color of ray floret distributed in quarter part of the plant. The main characteristic of cluster II were have semi upright growth type, medium stem anthocyanin colouration, ray florets ligulate type, secondary colour of ray floret distributed in the bottom part of the plants. The main characteristic of cluster III were have semi upright growth type, medium stem anthocyanin colouration, ray floret tubular type and secondary color distributed at the quarter part of the plants. In general, Dramaga (AK 14) and Ciaruten (AK16) accession showed that their production characters were better and more superior than those of the other accessions so that they were potential to be developed. Kenikir desired include those which have tall trees, large number of leaves, long and wide leaves, high yields and slow flowering.
Keyword: Characterization, cluster analysis, exploration

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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