Search for Articles:
Journal:
Subject:

Search Filter

Years
Between: -
Article Types
Search Results (2768)
Order
page
文章
K. Qudiesat , K. Abu-Elteen *, A. Elkarmi , M. Hamad and M. Abussaud
Full text
Views:707
Download:754
文章
Wafaa M. Abd El-Rahim*, Ola Ahmed M. El-Ardy and Hassan Moawad
Abstract: Experiments were done to study the bioremoval/ biosorption of dis-azo dye by Aspergillus niger strain 20 in two concentrations using 5 liter bioreactor at five aeration rates. The experimental results are compared for various operating conditions. The dye used was direct brown and the inlet air flow rate was: 1/8, ¼, ½, 1, 2 v/v/min. The aeration rate of ½ v/v/min yielded 9.2 g fungal biomass and removed 72%  of the dye. Increasing of the aeration rate to 2 v/v/min increased the removal to 77%, whereas the biomass was decreased markedly at the end of the incubation time. The results also indicate that the fungal biomass obtained at the three other air flow rates was more or less the same after 3 days of incubation. The obtained results indicate that air flow rates 1/8, ¼ and ½ v/v/min gave better dye bioremoval as compared with the high aeration rate (1, 2 v/v/min) and can be recommended for dis-azo dye bioremediation. Isotherm experiments were conducted to determine the sorbents-desorption behavior of examined dye from aqueous solutions using Langmiur and Freundlich equations.[...] Read More.
Keywords: Textile dyes, removing, dis-azo, batch reactor, modeling, bioremediation.
Full text
Views:728
Download:771
文章
Femi Kayode Agboola* and Adeyinka Afolayan
Abstract: The study of enzymes occupies a very important position in biological, medical and industrial research. Also, the satisfactory performance of an enzyme assay provides a good introduction to biochemical techniques. This experiment presents a good introductory project to students for the estimation of the kinetic parameters of an enzyme. The spectrophotometric/colorimetric assay of acid phosphatase is very simple with a readily available substrate, p-nitrophenyl phosphate, which can easily be purchased, and other common laboratory reagents; sodium hydroxide, sodium acetate and ethylenediamine-tetraacetic acid (EDTA). The snail is cheap and the heamolymph collected required no hemolysis and/or centrifugation. The assay method does not require an additional reagent for colour development. Earlier acid phosphatase had been found to be present in a relatively high activity in the heamolymph of the giant African snail, Archachatina marginata, and is highly specific for p-nitrophenyl phosphate.[...] Read More.
Keywords: Acid phosphatase, snail, Archachatina marginata, heamolymph, p-nitrophenyl phosphate.
Full text
Views:719
Download:744
文章
Ali Ait Ali, Nadia Rharbi, Azeddine Abrehouche and Hassan Nhhala
Abstract: Dentex juveniles of initial live weight 5 - 6 g and 108 days old after hatching, were fed three different diets for ten weeks (moist pellet (MP), imported dry pellet (IDP) and locally dry pellet (LDP)) containing three different lipid levels (26, 21 and 10% respectively) and crude protein levels (46, 45 and 47% respectively). Fatty acid composition showed that, DHA and EPA contents of moist pellet are higher than those of imported and locally dry pellets. DHA/EPA ratios of muscle were of 1.04 ± 0.00 (MP), 1.48 ± 0.57 (IDP) and 0.72 ± 0.05 (LDP). They increased in fact during feeding period for both the three tested diets while muscle’s EPA content decreased compared with its initial state when beginning this experiment. Obtained specific growth rate (SGR) by weight were 1.7, 2.4 and 2.7% and food conversion rate (FCR) were 1.8, 1.3 and 1.5 respectively for MP, IDP and LDP. While survival did not show significant difference (P>0.05), the best growth performance was observed using IDP and LDP as fish fed diets containing 47/10 and 45/21 protein/lipid ratios.[...] Read More.
Keywords: Dentex dentex, fingerlings, lipids, (n-3) HUFA, survival, growth.
Full text
Views:681
Download:740
文章
Adesokan, A. A.*, Yakubu, M. T., Owoyele, B. V., Akanji, M. A., Soladoye, A. O. and Lawal, O. K.
Abstract: The phytochemical screening of aqueous and ethanolic extracts of the stem bark of Enantia chlorantha Oliv as well as the antipyretic effect of the solvent extracts at 25, 50, 100 and 200 mg/kg body weight was investigated in albino rats. Phytochemical analysis of the aqueous and ethanolic extracts of E. chlorantha stem bark revealed the presence of phenolics, flavonoids, alkaloids, glycosides and saponins. The concentrations of these phytochemicals in the ethanolic extracts were slightly higher than in the aqueous extracts. The 50 - 200 mg/kg body weight of the solvent extracts produced significant reduction (P0.05) with the indomethacin dosed groups. This study showed that the aqueous and ethanolic extracts of E. chlorantha stem bark at 50 - 200 mg/kg body weight possess antipyretic activity and thus supports the folklore use of the plant in the management of fever.[...] Read More.
Keywords: Enantia chlorantha, brewer’s yeast, antipyretic, rectal temperature.
Full text
Views:703
Download:702
文章
Uma Devi P* and Chinnaswamy P
Abstract: With its hallucinations, delusions, thought disorder, and cognitive deficits, schizophrenia affects the most basic human processes of perception, emotion, and judgment. Evidence increasingly suggests that schizophrenia is a subtle disorder of brain development and plasticity and oxidative injury contributes largely to pathophysiology of schizophrenia, indicated by the increased lipid peroxidation products in plasma and altered levels of enzymatic antioxidants in schizophrenic patients. However, the status of antioxidants and the extent of lipid peroxidation in erythrocytes have not been investigated so far in schizophrenia patients with different symptoms. In the present study, in order to examine the antioxidant status and lipid peroxidation in the schizophrenics with positive, negative and cognitive symptoms, the activities of three free radical scavenging enzymes glutathione transferase (GST), glucose-6-phosphate dehydrogenase (G6PD), ceruloplasmin ferroxidase (Cp) and the level of thiobarbituric acid-reactive substances (TBARS) as an index of lipid peroxidation were analyzed. Results showed that there was a significant increase in GST activity in all the schizophrenics when compared to normal and it was observed that there was a significant decrease in erythrocyte, G6PD and ceruloplasmin ferroxidase levels in patients with schizophrenia, when compared to controls. Schizophrenics with positive symptomology were found to have pronounced decrease in the activities of Cp ferroxidase and statistically more significant decrease in G6PD levels were found in patients with negative symptoms. Further a significant rise in oxidative stress and decreased secondary enzymic antioxidant status was observed in the chronic stage of schizophrenics as compared to those in acute condition. The study showed that the level of malondialdehyde was increased in schizophrenics with positive (163%), negative (137%) and cognitive (132%) symptoms compared to control groups .The increased activities of antioxidant enzymes may be a compensatory regulation in response to increased oxidative stress. The decreased concentrations of the antioxidants status support the hypothesis that lipid peroxidation is an important causative factor in the pathogenesis of schizophrenia. These data reveal that antioxidant defense mechanisms might be impaired in schizophrenic patients. Understanding these basic pathologic processes may yield novel targets for the development of more effective treatments. Keywords: Schizophrenia, symptoms, secondary antioxidant enzymes, malondialdehyde (MDA), oxidative stress[...] Read More.
Keywords:
Full text
Views:691
Download:716
文章
Alisi C. S*, Emejulu A. A, Alisi P. N. C, Nwaogu L. A and Onyema O. O
Abstract: Hyperlipemia and Hepatic metabolism was studied in hyperlipemic albino rats maintained on a high fat diet. Aqueous extract (100, 200, 300mg/kg/day) of Urtica dioica corrected dyslipidemia and restored hepatic chemistry in hyperlipemic animals. The extract was effective in normalizing the atherogenic lipoprotein phenotype. Total cholesterol (CHOL), Triglyceride (TG), Low density lipoprotein cholesterol (LDL), LDL/HDL-ratio, and Total Non-HDL cholesterol (TNH-CHOL) were significantly reduced by the treatment. There was no significant effect of treatment with extract on the high density lipoprotein cholesterol (HDL). Hyperlipemia was associated with significant elevations in serum liver enzymes (ALT, AST, LDH, and -GT) activities that are markers of altered hepatic chemistry. These elevations were however normalized by treatment with the extract. Hyperlipemia also induced a significant increase in bilirubin levels, decrease in total protein and decrease in albumin levels. These alterations in hepatic chemistry were normalized by treatment with U. dioica at aqueous extract concentration of 300 mg/kg. The study shows that aqueous extract of U. dioica may restore lipemic normalcy, and may posses a potential for reduction of cardiovascular risk and a resistance to hyperlipemia-induced hepatic damage in rats. Keywords: Urtica Dioica, hyperlipemia, hepatic chemistry, cardiovascular risk, rats.[...] Read More.
Keywords: Urtica Dioica, hyperlipemia, hepatic chemistry, cardiovascular risk, rats.
Full text
Views:751
Download:713
文章
Samudram P.*, Rajeshwari Hari, Vasuki R., Geetha A. and Sathiya moorthi P.
Abstract: The combined hepatoprotective effect of Bi- herbal ethanolic extract (BHEE) was evaluated against carbon tetra chloride (CCl4) induced hepatic damage in rats. Ethanolic extract from the leaves of Eclipta alba and seeds of Piper longum at a dose level of 50 mg/kg body weight was administered orally daily once for 14 days. The substantially elevated serum marker enzymes such as SGOT, SGPT, ALP, LDH, ACP, gGT and 5’ Nucleotidase, due to CCl4 treatment were restored towards normalization. The biochemical parameters like total protein, total bilirubin, total cholesterol, triglycerides, and urea were also restored towards normal levels. In addition, BHEE significantly decreased the liver weight of CCl4 intoxicated rats. Silymarin at a dose level of 50 mg/kg was used as a standard reference also exhibited significant hepatoprotective activity against CCl4 induced hepatotoxicity. The results of this study strongly indicate that BHEE has got a potent hepatoprotective action against CCl4 induced hepatic damage in rats.[...] Read More.
Keywords: Hepatoprotective, marker enzymes, Bi-herbal ethanolic extract, carbon tetra chloride.
Full text
Views:825
Download:713
文章
J.T. Ekanem, *O.M. Kolawole, O.C. Abbah
Abstract: An in vivo study of the trypanocidal potential of Bridelia ferruginea benth bark was investigated to determine its possible use against African sleeping sickness. Phytochemical screening revealed the presence of alkaloids, tannins, saponins, steroids and phlobatanins. Four groups of male albino rats weighing 220-250 g were used. The groups included the control, infected -untreated, uninfected-treated, and infected-treated. A daily dose of 20 mg/Kg body weight methanolic extract of B. ferruginea benth bark was administered intraperitoneally at 72 h post-infection with Trypanosoma brucei brucei and parasitaemia was monitored daily. A continuous rise in parasite count was observed in the infected-untreated group. The infected-treated group showed a progressively lowered parasitamia on Days 5 to 8 post-infection, with percentage parasite reduction between 11 and 76%. Treatment also extended the lifespan for 2 days. Results also showed that treatment significantly ameliorated heamatological parameters that were studied. We suggest that methanolic extract of B. ferruginea benth bark can be useful in the management of African sleeping sickness.[...] Read More.
Keywords: Bridelia ferruginea benth bark, Trypanosoma brucei, sleeping sickness, management.
Full text
Views:682
Download:758
Submit Your Manuscript Now