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Vector representation of multiplication and division of complex numbers
(National Council of Teachers of Mathematics, 1954-05)
One question raised by students in mathematics is how to represent multiplication and division of complex numbers by vectors in rectangular co-ordinates. The purpose of this brief paper is to present a simple explanation ...
Involution operated geometrically
(National Council of Teachers of Mathematics, 1955-04)
High school students of plane geometry may be interested in the central theme of this paper as a generalization of the usual problem of finding a line equal to the square of a given line.
Mathematical miscellanea: Two cube root curves
(National Council of Teachers of Mathematics, 1955-12)
It is a matter of common knowledge that it is impossible to duplicate a cube by means of the straightedge and compasses. There are, however, several methods which make use of algebraic curves. This presentation is intended ...
Squaring a circle
(National Council of Teachers of Mathematics, 1957-01)
It is impossible to construct a square equal to a given circle by the exclusive use of a straight edge and compass. This paper is intended to present a solution to this problem with a slight departure from the purely ...
Responsible aquaculturists: The information-seeking behavior of milkfish farmers in Iloilo, Philippines
(SAGE Publications, 2019)
Compliance with a policy, law, standard or code requires understanding of its provisions. However, for someone to understand it, he must be aware of its existence and be provided access to it. A qualitative-quantitative ...
Adaptation to flooding in upland and lowland ecotypes of Cyperus rotundus, a troublesome sedge weed of rice: Tuber morphology and carbohydrate metabolism
(Oxford University Press, 2008-05-30)
Background and aims
In recent years, Cyperus rotundus has become a problem weed in lowland rice (Oryza sativa) grown in rotation with vegetables in the Philippines. As the growth of C. rotundus is commonly suppressed by prolonged flooding, the ability of the weed to grow vigorously in flooded as well as upland conditions suggests that adapted ecotypes occur in these rotations. Studies were conducted to elucidate the mechanisms that permit C. rotundus to tolerate flooded soil conditions.
Methods
Upland and lowland ecotypes of C. rotundus were compared in terms of growth habit, carbohydrate reserves and metabolism, and activities of enzymes involved in alcoholic fermentation – alcohol dehydrogenase (ADH) and pyruvate decarboxylase (PDC).
Key Results
The lowland ecotype has much larger tubers than the upland ecotype. Prior to germination, the amylase activity and total non-structural carbohydrate content in the form of soluble sugars were greater in the tubers of lowland plants than in those of upland C. rotundus. At 24 h after germination in hypoxic conditions, PDC and ADH activities in the lowland plants increased, before decreasing at 48 h following germination. In contrast, ADH and PDC activities in the upland plants increased from 24 to 48 h after germination.
Conclusions
Tolerance of lowland C. rotundus of flooding may be attributed to large carbohydrate content and amylase activity, and the ability to maintain high levels of soluble sugars in the tubers during germination and early growth. This is coupled with the modulation of ADH and PDC activities during germination, possibly to control the use of carbohydrate reserves and sustain substrate supply in order to avoid starvation and death of seedlings with prolonged flooding....
Antihyperglycemic and cholesterol-lowering potential of dietary fibre from lemongrass (Cymbopogon citratus Stapf.)
(IOS Press, 2021-12-03)
BACKGROUND: The major component of lemongrass by weight is dietary fibre (DF), but no literature has been reported on its DF components and fermentation products when ingested.
OBJECTIVE: This study analysed DF components ...
Local governance vs. centralization: The case of pastors in the CPBC
(Institute of Advanced Theological Studies (IATS) and College of Theology, 2005)
This research endeavor seeks to determine preferences of CPBC pastors on local governance versus centralization.
Specifically, the objectives of this study are as follows:
1) To determine the profile of the pastors ...