Judul: Toleransi dan respon fisiologi tanaman Celosia cristata, Gomphrena globosa, dan Catharanthus roseus terhadap zat pencemar udara
Abstrak: Air pollution is an environmental issue that occurs due to change in air composition of its normal state. Plants have been known as bio indicator for air pollution through the growth response. Information capability of herbs plant to absorb pollutant is very limited. The objectives of this research were to determine the tolerance and physiological responses of Celosia cristata, Gomphrena globusa, and Catharanthus roseus due to air pollutant. On the other site, data were also collecyed at green house of IPB Dramaga, which has a relatively low of pollutants. Growth and physiological parameters were recorded include plant height, number of leaf, total leaf area, number of leaf senescence, fresh and dry weight of plant, chlorophyll content, ascorbic acid content (ASA), and the activity of ascorbate peroxidase (APX). Data were analyzed by analysis of variance and Duncan Multiple Range Test (DMRT). This study revealed that plants on location with relatively high of pollutant have plant height, number of leaf, total leaf area, fresh and dry weight lower than those of plants on relatively low of pollutant whereas, total leaf senesence increased. Cataranthus rosesus showed decreasing of chlorophyll content and increasing of APX activity as physiological response due to air pollutant.
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Judul: Anatomi Jaringan Daun Dan Pertumbuhan Tanaman Celosia cristata, Catharanthus roseus, Dan Gomphrena globosa Pada Lingkungan Udara Tercemar
Abstrak: The presence of CO, NOx, SOx, O3, HC, Pb, and TSP (dust) at environment indicated air pollution. The plant of Celosia cristata, Catharanthus roseus, and Gomphrena globosa could be used to detect how bad the air pollution in the environment. The objective of this research were to analyze the anatomy of leaf tissue and plant development of Celosia cristata, Catharanthus roseus, and Gomphrena globosa due to air pollution. The plants were grown in the Block E Babakan garden unit of University Farm, Babakan Sawah Baru Dramaga – Bogor which closed to roadside and greenhouse Department of Biology FMIPA IPB which far away from roadside. The increasing plant height and leaf number were observed every 5 days, however, leaf size was every 10 days. Fresh and dry plant weighted after the end of 3 months. The stomatal index and density, glandular and non-glandular trichome, cuticular, leaf, epidermal, palisade parenchyma, spongy parenchyma of thickness were observed on paradermal section using whole mount, and transversal section using paraffin methods. Plant parameters showed higher value at location closed to roadside than in the greenhouse. Celosia cristata had anatomical modification: stomatal index and density increased (adaxial and abaxial) and showed bigger the leaf size. Catharanthus roseus leaves thicker due to anatomical changed (transversal section), fresh and dry plant roots weight increased. While the effect of air pollution on Gomphrena globosa showed higher stomatal index and density, glandular trichome at adaxial side, but no differences for their relative growth.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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