The Contribution of food plants to the growth, development and fecundity of Zonocerus variegatus (L)

The performance of the variegated grasshopper, Zonocerus variegatus (L) fed on different food plants namely cassava (Manihot esculenta), pawpaw (Carica papaya) and acalypha (Acalypha wilkesiana) and a mixture of these plants (mixed diets) from 5th nymphal instar to adult was investigated. Survivor and longevity of nymphs and as well as the reproductive performance of adult Zonocerus was greater and better for insect fed on cassava and mixed diets, as compared to those fed only on Acalypha and pawpaw. Adults emerged between the 5th to 16th week in cages containing 5th instars fed on cassava and mixed diets, while it took between 7-23 weeks for those fed on acalypha and pawpaw to emerge as adult. There were significant differences in the measurements of the body parameters of insects fed on the four different food plants. Ranking was cassava>mixture>pawpaw>acalyhpa. Sex had no significant effect on the measurement of body parameters regardless of the food plants. Feeding assay showed that there was a significant difference between the amounts of leaves consumed by Zonocerus fed on the different food plants. Of all the diets, cassava was the most preferred and most consumed food plant. This had a corresponding effect on the weight gained by the insects. The results of the proximate analysis showed significant differences in the dry matter, crude protein and fat content of Z. variegatus fed on the different food plants. A positive correlation existed between the body weight, protein and fat content of Z. variegatus fed on the different food plants. Key words: Zonocerus variegatus, food plants, instar, growth, development. African Journal of Biotechnology Vol.2(10) 2003: 350-35

Pengaruh Microstock Terhadap Kesadaran Hak Kekayaan Intelektual Desainer Grafis

ABSTRAKMicrostock menjadi salah satu unsur penting yang menunjang aktifitas desainer grafis sehari-hari. Baik untuk mendapatkan konten grafis digital, mengetahui perkembangan tren desain kekinian dan menjadi jawaban mereka untuk bekerja secara freelance. Penelitian ini menyajikan apa dan sejauh mana hubungan microstock dengan desainer grafis, kesadaran desainer grafis tentang hak kekayaan intelektual dan fenomena pengaruh microstock terhadap kesadaran hak kekayaan intelektual desainer grafis. Jenis pendekatan yang digunakan adalah fenomenologi Edmund Husserl karena objek yang diteliti berkaitan dengan kesadaran manusia. Fokusnya adalah memaparkan fenomena kesadaran sebagai dasar tindakan yang diperoleh dari pemaknaan pengalaman desainer grafis selama berhubungan dengan microstock. Berdasarkan hasil penelitian, dapat disimpulkan bahwa microstock terbukti memiliki pengaruh terhadap kesadaran desainer grafis tentang hak kekayaan intelektual. Pengalaman-pengalaman tindakan yang berkaitan dengan microstock baik sebagai kontributor maupun non-kontributor telah membentuk suatu pengetahuan baru hingga akhirnya melahirkan kesadaran tentang hak kekayaan intelektual terutama pada masalah lisensi dan royalti. Kesadaran tersebut lalu menjadikan desainer grafis mampu aktif merespon fenomena penghargaan maupun pelanggaran hak kekayaan intelektual di lingkungannya masing-masing.ABSTRACTThe Microstock Influence on Consciousness of Graphic Designer’s Intellectual Property Right’s. Microstock has been one of important elements to support the daily activities of graphic designers. These activities involve finding digital graphic contents, finding out the current development of design trend and becoming their answer to work freelance. This research presents what and to what extent is the relationship between microstock and graphic designers, graphic designer’s consciousness of intellectual property rights and the phenomenon of microstock’s effect on graphic designers’ consciousness of intellectual property rights. The approach used is Edmund Husserl’s phenomenology since the object studied is related to human’s consciousness. The focus is to elaborate the phenomenon of consciousness as the basis of action which is obtained from interpreting graphic designer’s experience when they interact with microstock. Based on the research result, it can be concluded that microstock is found to have some influence on graphic designer’s consciousness of intellectual property rights. The experiences of action related to microstock both as contributors and non-contributors have shaped a new knowledge that in turn gives birth to their consciousness of intellectual property rights, particularly on license and royalty issues. This consciousness then allows graphic designers to actively respond to the phenomena of appreciation and violation of intellectual property rights in their own environment

Experimental and Quantum Chemical Studies on the Corrosion Inhibition Potentials of Xylopia aethiopica extracts

Root and root bark extracts of Xylopia aethiopica (XE) have been evaluated as corrosion inhibitors for mild steel in aerated 0.1 M HCl and H2SO4 solutions by gravimetric method. The inhibition efficiency increases with increase in inhibitor concentrations. Adsorption mechanisms for the adsorptions of XE extracts’ molecules were predicted using the following adsorption isotherms (Langmuir, Freundlich, Temkin and El-Awady) by linear regression. With the aid of Chi-square (X2) statistic, the best fitted adsorption isotherms were selected. Physisorption mechanisms have been proposed for the extracts in the studied acidic media.  Quantum chemical calculations gave some electronic properties of the molecules of XE extracts so as to ascertain any correlation(s) between the corrosion inhibition and molecular structures. Keywords: Quantum Chemical calculation, Xylopia aethiopica, corrosion inhibitio