Healthy and active Clarias gariepinus were
exposed to acute and sub-lethal concentrations of
DDT for a period of 96 hours and 30 days,
respectively. The 96 h LC50 was registered as 1.55
mg/l. It has been observed that protein concentration
was decreased, and the glucose was elevated in the
plasma of treated fish. Sub-lethal DDT exposure has
decreased significantly (P<0.05) the level of
glycogen in muscle and liver. The DDT has caused
a decrease in the counts of erythrocyte (RBC) and
Various concentrations of biotin were tested in order to achieve fluent excretion of glutamic acid (glu) in a fermentation
medium composed of a locally isolated Corynebacterium glutamicum strain. The behaviour of the strain was observed to
vary with varying concentrations of biotin. Maximum values for specific growth rate (μ, h-1), cell mass yield (Yx/s, g/g),
substrate consumption rate (QS, g/l h) and cell mass specific productivity (qX, g/g h) were 0.34, 0.24, 2.92 and 1.43,
A new copper metallothionein (TfCuMT) gene has been identified from a locally isolated ciliate Tetrahymena farahensis. It contains 327
nucleotides encoding a peptide chain of 108 amino acids and belongs to class MTT2 and subfamily 7b. Amplification from both gDNA
and mRNA confirmed the intronless nature of this gene. Like most of the metallohtioneins, cysteine residues contribute nearly 30%
content with the specific CKC motifs. Structural repeats present in peptide sequence of TfCuMT indicate internal duplication of gene at
Constitutive activation of mutant K ras (Kirsten rat sarcoma viral oncogene homologue) and disassembly of E-cadherin–catenin complex
(E-cadherin, a-catenin, b-catenin, and g-catenin) play an important role in apoptosis, differentiation, and cell proliferation. In this study, the
expression pattern of K ras and E-cadherin–catenin complex has been evaluated in normal and mutant colorectal cancer cell lines with an
object to determine its impact on disassociation of cells from one another. We addressed the expression analysis of K ras with reference to its
Contents: Advanced consideration of the aquatic ecology of aquatic animals species emphasizing current issues which include: community structure, population growth, population regulation, dispersion, species interaction, diversity, competition, predation, age composition, density and niche theory. Recent advances of the interrelationships between aquatic fauna and their environment. In depth studies, of recent advances of statistical design and analysis of ecological measurement of selected aquatic populations.
Contents: Introduction, ecology of individuals: organisms limiting factors, important a biotic factors, dispread Population ecology; structure and diversity; biomass system population regulation, interspecific competition, community and ecosystem ecology: zoogeography, aquatic ecological zones in Saudi Arabia, ecological relationship between plankton and nekton in marine, fresh water and estuarine habitats, effects of ecological factors on aquatic animals and their media, aquatic community stratification, productivity, methods and measurements and primary productivity, poll
تحرير ضمن المعلومات الشخصية