5,734 research outputs found
Polycyclic aromatic hydrocarbons (PAHs) in air and vegetation: case study at three selected toll stations along North South Expressway in Johor, Malaysia
Polycyclic aromatic hydrocarbons (PAHs) from vehicular emission are products of
the incomplete combustion of organic fuel, and are usually attached to the particulate
matter from the emission and can caused pollution and hazard to human health due to
its carcinogenic, mutagenic and teratogenic characteristics. The objective of this
study is i) to determine the concentration PAHs in the air of sampling area, ii) to
determine the concentration PAHs in vegetation, iii) to determine the relationship of
concentration of PAHs in plants and air of sampling area and iv) to study the
different composition of PAHs in different species of plants to determine the
potential biomonitoring agent. The study is carried out at three toll stations along
PLUS’ North-South Expressway in Johor. Air sample and plant leaves sample
collected were extracted with ultrasonic agitation in dichloromethane and
fractionated according to polarity before submitted to gas chromatography – mass
spectrometry analysis to determine the concentration of the PAHs compounds.
Spearman’s rank correlation test was carried out using SPSS to determine the
correlation between concentration of PAHs in air and plant leaves sample. Seven
PAHs were identified and quantified in the atmospheric sample and plant leaves
sample. Those PAHs were acenaphtylene (ACN), phenanthrene (PHE), fluorene
(FL), pyrene (PY), chrysene (CHR), benzo[a]anthracene (BaA), and benzo[a]pyrene
(BaP). Significant correlation at 0.05 level (2-tailed) was observed in samples
of Ficus microcarpa, Cordyline fruticosa, Hibiscus spp., and Ixora coccinea with the
value 0.622, 0.643, 0.680 and 0.608 respectively. The positive correlation shows that
the plants have capabilities to absorb organic pollutants from the environment. Based
from this research, the most suitable species to be introduced into the environment as
a biomonitoring agent and to be further studied as a medium for low and medium
level pollution bioremediation is Ficus microcarpa, Cordyline fruticosa, and Ixora
coccine
Positive linear functionals on BP*-algebras
Let A be a BP*-algebra with identity e, P_{1}(A) be the set of all positive
linear functionals f on A such that f(e) = 1, and let M_{s}(A) be the set of
all nonzero hermitian multiplicative linear functionals on A. We prove that
M_{s}(A) is the set of extreme points of P_{1}(A). We also prove that, if
M_{s}(A) is equicontinuous, then every positive linear functional on A is
continuous. Finally, we give an example of a BP*-algebra whose topological dual
is not included in the vector space generated by P_{1}(A), which gives a
negative answer to a question posed by M. A. Hennings.Comment: This is an English translation of the original article written in
Frenc
On saturated uniformly A-convex algebras
Following ideas of A.C.Cochran, we give a suitable definition of a saturated
uniformly A-convex algebra. In the m-convex case, such algebra is a uniform
topological one.Comment: 6 page
On a conjecture concerning some automatic continuity theorems
Let A and B be commutative locally convex algebras with unit. A is assumed to
be a uniform topological algebra. Let h be an injective homomorphism from A to
B. Under additional assumptions, we characterize the continuity of the
homomorphism h^(-1) / Im(h) by the fact that the radical (or strong radical) of
the closure of Im(h) has only zero as a common point with Im(h). This gives an
answer to a conjecture concerning some automatic continuity theorems on uniform
topological algebras.Comment: 5 page
A real seminorm with square property is submultiplicative
A seminorm with square property on a real associative algebra is
submultiplicativeComment: 3 page
A remark on continuity of positive linear functionals on separable Banach *-algebras
Using a variation of the Murphy-Varopoulos Theorem, we give a new proof of
the following R.J.Loy Theorem: Let A be a separable Banach*-algebra with center
Z such that ZA has at most countable codimension, then every positive linear
functional on A is continuous.Comment: 3 page
A real p-homogeneous seminorm with square property is submultiplicative
We give a functional representation theorem for a class of real p-Banach
algebras. This theorem is used to show that every p-homogeneous seminorm with
square property on a real associative algebra is submultiplicative.Comment: 8 page
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