Telah dilakukan penelitian untuk menentukan nilai koefisien absorbsi bunyi dan impedansi akustik dengan menggunakan metode tabung. Material Akustik dibuat dari serat daun nanas matriks resin epoksi memvariasikan komposisi massa volume pada setiap sampel. Variasi antara berturut-turut adalah 17,5 g : 6,41 ml, 18,12 5,87 18,75 5,34 19,37 4,8 20 4,27 ml. Range frekuensi kebisingan yang digunakan i...

Phosphoenolpyruvate carboxykinase has been partially purified from pineapple (Ananas comosus [L.]) leaves. Specific activities obtained show it to be a major activity in this tissue. Above 15 C, the respective activation energies for decarboxylation and carboxylation are 13 and 12 kcal/mol. Below 15 C, there are discontinuities in Arrhenius plots with an associated large increase in activation ...

The data reported in this paper were obtained from plants grown in nutrient solutions supplied with high or low amounts of potassium, namely 205 or 4 mg. per liter but with equal amounts of either nitrateor ammonium-nitrogen. Tops or crowns (vegetative organs produced at the apex of fruits) of uniform size from a single clone were placed in tap water for one month until they had produced about ...

The effects of intercycle cover crops on Rotylenchulus reniformis population densities in pineapple were evaluated in one greenhouse and two field experiments. In the greenhouse, Crotalaria juncea, Brassica napus, and Tagetes erecta were planted for 3 months and then incorporated. These treatments were compared to weedy fallow with or without 1,3-dichloropropene (1,3-D) in three soils (Makawao ...

Brazil produces over than 70,000 ha of pineapple, being the world leader in pineapple production, and Minas Gerais State alone produces over than 600 kt/y. The pineapple is the marketable plant part, which represents only 23 % of the plant itself, and the remaining plant, stem, leaves, bark and crown, being considered an agroindustrial residue. This residue contains great amount of bromelain, a...