Papers by Ali madaouki Maman sani
Optics and Photonics Society of Iran, Mar 10, 2018
Solar cells fabricated by Organic−inorganic perovskite material because of optimal properties inc... more Solar cells fabricated by Organic−inorganic perovskite material because of optimal properties including direct band gap, large absorption coefficients, high carrier mobility and easier process is under consideration by the researcher, recently. One of these promising organic-inorganic material is CH3NH3PbI3 which prepare by mixture of PbI2 and CH3NH3I. In this research, PbI2 powder was synthesized with Golderin technique and by two different calcination procedures and used in preparing perovskite material. Then, the perovskite solar cells with planar structure were fabricated using these materials and also PbI2 powder purchased from Sharif Solar Company as a reference. Then, the solar cell performance including photovoltaic performance and cell efficiencies were compared. Results indicate that the solar cell samples in which PbI2 prepared with heat-shock-process have better photovoltaic performance such as short circuit current density, fill factor and efficiency. It should be noted that these reported data are related to hole-transport-free perovskite solar cells.
Charge transfer engineering of layers for stability of perovskite solar cells with planar structure
Optics and Photonics Society of Iran, Mar 10, 2019
Asian Journal of Pharmaceutical and Clinical Research
Objective: The study was aimed at evaluating in vitro antitrypanosomal activity of Garcinia kola ... more Objective: The study was aimed at evaluating in vitro antitrypanosomal activity of Garcinia kola against Trypanosoma brucei brucei.Methods: The plant materials were extracted and screened for phytochemicals. The antitrypanosomal activity of 70% and 100% G. kola extracts against the parasite was determined in vitro.Results: Both extracts contained saponins, tannins, carbohydrates, cardiac glycosides, and flavonoids. However, anthraquinones and alkaloids were undetected. The parasites were seen to be actively motile within the first 30 min post-incubation period in 70% hydroethanolic G. kola extract and were found dead at 40–60 min in a higher concentration of extract. After 10 min post-incubation of the parasites in 100% ethanolic extract of G. kola, the parasites were observed to be active at lower concentration but at higher concentrations of the extracts, no trypanosomes were seen.Conclusion: 100% extract induces ceasing of motility at the lesser time compared to 70% ethanolic ext...
Biology, 2022
The distribution of arsenic continues due to natural and anthropogenic activities, with varying d... more The distribution of arsenic continues due to natural and anthropogenic activities, with varying degrees of impact on plants, animals, and the entire ecosystem. Interactions between iron (Fe) oxides, bacteria, and arsenic are significantly linked to changes in the mobility, toxicity, and availability of arsenic species in aquatic and terrestrial habitats. As a result of these changes, toxic As species become available, posing a range of threats to the entire ecosystem. This review elaborates on arsenic toxicity, the mechanisms of its bioavailability, and selected remediation strategies. The article further describes how the detoxification and methylation mechanisms used by Shewanella species could serve as a potential tool for decreasing phytoavailable As and lessening its contamination in the environment. If taken into account, this approach will provide a globally sustainable and cost-effective strategy for As remediation and more information to the literature on the unique role of...
Toxicology Reports, 2016
Metallic work is one of the widespread economic activities in urban Kano. Little or no attention ... more Metallic work is one of the widespread economic activities in urban Kano. Little or no attention is usually directed at occupational health risk by local or state authorities in Kano. The present work was aimed at the evaluation of DNA damage in metal workers by Alkaline Comet Assay in blood lymphocytes. The results showed that there was significant difference statistically between the level of DNA damage in blood lymphocytes of metal workers and control group (p < 0.05). In addition, the level of damage to DNA in blood of subjects with long term exposure and old age is of serious concern. There is the need to monitor occupational activities that can pose serious health risks. The relative ignorance of the metal workers about the health risks they are exposed to as well as the public should be addressed.
Journal of Natural Sciences Research, 2014
The study involves comparative quantitative study of eight (8) different brands of Amoxicillin, u... more The study involves comparative quantitative study of eight (8) different brands of Amoxicillin, using UV Spectrophotometry and High Performance Liquid Chromatography. All the samples of Amoxicillin tested using UV analysis failed the test as all are above the specified range of 90-120% as stated by USP, 2007. Using the HPLC analysis, only 3 of the Amoxicillin samples passed the test, Healmox (108.3%), Barbimox (117.5%) and Cimoxil (114.98%) while Nemoxil, Amox 500, Cikamox, Climox and Lamox failed the test with 47.17%, 39.7%, 139.4%, 139.4%, and 74.5% respectively using the standard of 90-120% as specified by
Toxicology Reports, 2016
The constant discharge of agricultural waste into aquatic environment has led to accumulation of ... more The constant discharge of agricultural waste into aquatic environment has led to accumulation of heavy chemicals and other variety of pollutants. Herbicides present in these wastes are washed down, carried by rains and flood to nearby aquatic environment. Glyphosate is one of the most popular herbicides used by farmers in Kano because of its active reaction on killing weeds without affecting the crops. A toxicity test of glyphosate was conducted using concentrations of 0, 0.004, 0.005, 0.006, 0.007 ml/l. The mortality rate of each concentration was determined and the physicochemical parameters (Dissolved oxygen and pH) were also determined. The result showed that high mortality occurs at 0.007 ml/l and less mortality was found at 0.004 ml/l. Hence, mortality is dose dependent. DO and pH decreases with increase in glyphosate concentration. Furthermore, the juveniles showed abnormal behaviour. The LC 50 value at 96 h was 0.0072 ml/l. There was significant difference between the initial and final pH value (p < 0.05). On the other hand, the initial and final DO values showed no significant difference (p > 0.05). However, correlation between DO and pH showed no significant difference (p > 0.05). The findings of this study established that glyphosate has some level of toxicity on Clarias gariepinus juveniles. In addition, it was found that mortality, changes in behaviour, DO and pH are dose dependent. Therefore, it was suggested that an appropriate concentration that will not be detrimental to non-target organisms should be used by farmers. Alternatively, Biological method should be used as a substitute for chemical method of controlling weeds.
International Journal of Energy Economics and Policy, Mar 15, 2013
In this study, it has been attempted to select the best continuous-time stochastic model, in orde... more In this study, it has been attempted to select the best continuous-time stochastic model, in order to describe and forecast the oil price of Russia, by information and statistics about oil price that has been available for oil price in the past. For this purpose, method of The Maximum Likelihood Estimation is implemented for estimation of the parameters of continuous-time stochastic processes. The result of unit root test with a structural break, reveals that time series of the crude oil price is a stationary series. The simulation of continuous-time stochastic processes and the mean square error between the simulated prices and the market ones shows that the Geometric Brownian Motion is the best model for the Russian crude oil price.
Advances in Life Science and Technology, 2014
The quantitative analysis of different brands of Amlodipine tablets was carried out (using HPLC a... more The quantitative analysis of different brands of Amlodipine tablets was carried out (using HPLC and U.V Spectrophotometer) to determine if the drugs are of required standards. The results obtained from analysis of the various drugs were compared with that of the standard. The percentage content for each sample was calculated using the absorbance and peak areas of the samples and that of the standard to see if they are within specified limit as stated by the official books. Amlodipine has a range of 97%-102% according to B.P 2008, From the result obtained using UV-Spectrophotometer,A (98.3%), B (100%),E (101.8%),F (101.22%),I (100.8%) are all within the B.P Specified limit while D (88.65%),G (65.57%) and C are said to be below the B.P specified limit. From the result obtained using HPLC analysis G (101.5% and A (100%) are said to be within the specified limit but E (441.8%), I (90.4%),H (92.2%) and F (95.4%) are all below the B.P specified limit while B (104.3%),C (126.2%) and D (201.8%) are said to be above the B.P specified limit. using UV-spectrophotometry shows that 5 samples of the Amlodipine passed and 4 samples failed while for HPLC, only 2 samples passed
Journal of Natural Sciences Research, 2014
The experiment involves analysis of nine brands of hyoscine butylbromide using ultra violet spect... more The experiment involves analysis of nine brands of hyoscine butylbromide using ultra violet spectrophotometer in the range of (200-400nm) and high performance liquid chromatography (HPLC) in which the samples were dissolved in various solvents and their various absorbance, peak area at various wavelength were determined and compared with that of the standard, wavelength of maximum absorbance at 210nm for hyoscine butylbromide. Percentage and milligramme content for each sample was determined so as to note if it was within the acceptable range of (92.5-107.5%) for hyoscine butylbromide. For those that passed the test or if it was below or above the range for samples that are substandard or highly concentrated. The samples absorbance and peak area was used along side with the standard absorbance and peak area to calculate the percentage content of each sample. It was observed that of the Of the nine samples of hyoscine butylbromide tablet, only shreecopan with 93.6% passed using UV spectrophotometer while bixkopan with 99.8%, buscomac 101.6%, spanil 97.2% and unipan 104.7% passed using HPLC.
Difference between sample median and population median with odd sample sizes
African Journal of Pure and Applied Chemistry, 2014
The levels of some heavy metals were investigated in selected edible potions of the vegetables; A... more The levels of some heavy metals were investigated in selected edible potions of the vegetables; Amarathus caudatus (Spinach) and Hibiscus sabdariffa (Rosella) are grown in Uba area along the Yedzaram River in North Eastern Adamawa State, Nigeria. All samples were randomly collected from two different gardens. The levels of the heavy metals, (Cu, Fe, Cd, Cr and Zn) were analyzed using Atomic Absorption Spectrophotometer (AAS) (BUK 210 model). In all the samples analyzed, Cd and Cr were not detected. The levels of heavy metals in Farm A for H. sabdariffa leaves ranges from Cu (30.00 ± 0.15 mg/kg to 31.00 ± 0.18 mg/kg), Fe (37.39 ± 0.02 mg/kg to 48.47 ± 0.10 mg/kg), Zn (13.00 ± 0.01 mg/kg to 25.50 ± 0.48 mg/kg), respectively. In Spinach, the results ranged from Cu (34.33 ± 0.42 mg/kg to 34.50 ± 0.05 mg/kg), Fe (31.72 ± 0.71 mg/kg to 43.33 ± 0.02 mg/kg), Zn (21.17 ± 0.14 mg/kg to 10.83 ± 0.17 mg/kg), respectively. The data were analyzed with t-test and analysis of variance (ANOVA). There were significant differences (p < 0.05) between the levels of the heavy metals in the vegetables obtained from Farms A and B. The order of the metal contamination in the vegetables was Fe > Cu > Zn in Farm A and Cu> Fe> Zn in Farm B. The elevated levels of metals in vegetables in the two gardens could be attributed to excessive usage of fertilizers and other agro-chemicals and of course the environmental factors of the areas. The results were however lower than the published threshold values considered toxic for mature plant tissue, except Fe which has higher values. The consumption of these vegetables as food may not pose possible health hazards to human at the time of the study.
International Journal of Biological Macromolecules, 2015
Lactoferrin is a glycoprotein, playing several biological roles. The main goal of our work was to... more Lactoferrin is a glycoprotein, playing several biological roles. The main goal of our work was to nanoencapsulate the isolated lactoferrin from camel milk through alginate nanocapsuls. We studied the influence of alginate concentration (0.2 and 0.5% w/w) and encapsulation method (thermal vs. non-thermal treatment) on the encapsulation efficiency, zeta potential, particle size and release of lactoferrin from nanocapsuls. Our results revealed in 0.8 and 0.9M NaCl fractions, lactoperoxidase was present. So these fractions were not passed to further experiments. On average, we measured the lactoferrin content to be 0.5 g/l within the original camel milk. In general, higher alginate concentration resulted in higher encapsulation efficiency and nanocapsuls prepared with thermal treatment had a higher efficiency (almost 100%) along with smaller particle sizes (mostly <100 nm). By evaluating the release of lactoferrin from nanocapsuls, it was revealed that there was no release at the first 30 min in both pH values (2 and 7). This could be particularly useful since lactoferrin would be maintained intact within stomach conditions and it can reach lower gastrointestinal tract to be delivered safely into the body.
Efficacy of a 3-day oral regimen of quinine in an area of northern Nigeria with low-grade resistance of Plasmodium falciparum to chloroquine and sulphadoxine-pyrimethamine
The Journal of tropical medicine and hygiene, 1995
The efficacy in vivo of a 3-day oral regimen of quinine (30 mg/kg/day) was assessed in 34 childre... more The efficacy in vivo of a 3-day oral regimen of quinine (30 mg/kg/day) was assessed in 34 children with falciparum malaria in an area of northern Nigeria with previously documented low-grade parasite resistance to chloroquine and sulphadoxine-pyrimethamine (SDX/PYR). By day 4, all 34 children were free of parasites. Mean parasite clearance time and fever clearance time were 2.7 and 1.7 days, respectively. However, on day 14, 5 (14.7%) children were again parasitaemic and 4 of them were clinically ill. They were again treated successfully with a standard course of oral chloroquine. No adverse drug effects were recorded. Of the 34 children, 9 parasite isolates were successfully cultured in vitro. EC50 and EC99 were 14.0 and 126.0 pmol per well respectively, indicating decreased parasite sensitivity but no resistance in vitro. In conclusion, the 3-day course of quinine was found to be an effective alternative to standard chloroquine treatment in the study area.
Nigerian Journal of Technological Research, 2013
A study was conducted in Delta State, a major Niger Delta region of Nigeria. The aim was to evalu... more A study was conducted in Delta State, a major Niger Delta region of Nigeria. The aim was to evaluate some heavy metals concentration in municipal wastes dumpsites that are presently used for intensive horticultural crops production. The heavy metals studied were; Iron (Fe); Lead (Pb); Mercury (Hg); Cromium (Cr); Nickel (Ni); and Cadmium (Cd). A semi-detailed survey at the scale of 1:25,000 was employed in the study, and five permanent dumpsites randomly located in Warri, Ughelli, Sapele, Agbor and Asaba were used. A total number of 30 composite waste samples were collected, processed and digested using Diethylenetriaminepenta-acetic acid (DTPA) extracting solution. The results of the study showed that the values of the heavy metals evaluated ranged from 83.
Antifungal activity of essential oil of Ziziphora clinopodioides and the inhibition of aflatoxin B1 production in maize grain
Toxicology and Industrial Health, 2013
The aim of this study was to determine the antifungal effect of the essential oil obtained from Z... more The aim of this study was to determine the antifungal effect of the essential oil obtained from Ziziphora clinopodioides L on two fungi species including Aspergillus flavus and Aspergillus parasiticus using microdilution method. The minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were determined for the essential oil at 10 different concentrations (i.e. 25,000, 12,500, 6250, 3125, 1562.5, 781.25, 390.625, 195.31, 97.65, and 48.82 µg/ml). Finally, the effect of the essential oil at six levels (6250, 3125, 1600, 800, 400, and 196 µg/ml) was investigated on the growth and activity of A. flavus and A. parasiticus, and also toxin production of these species in maize at 0.97 aw and 25°C after 29 days. Aflatoxin B1 (AFB1) content was assayed by enzyme linked immuno-sorbent assay technique. Results showed that essential oil of Z. clinopodioides was found more effective on A. parasiticus than A. flavus in both in vitro and in vivo conditions. Z. clinopodioid...
Inhibitory Effect ofHelichrysum arenariumEssential Oil on the Growth of Food Contaminated Microorganisms
Journal of Essential Oil Bearing Plants, 2014
Abstract The aim of this study was to determine the antimicrobial effect of Helichrysum arenarium... more Abstract The aim of this study was to determine the antimicrobial effect of Helichrysum arenarium L. essential oil in “in-vitro” condition on the growth of seven microbial species including Bacillus subtilis, Escherichia coli, Staphylococcus aureus, Saccharomyces cereviciae, Candida albicans, Aspergillus flavus and Aspergillus parasiticus using micro-dilution method. The minimum inhibitory concentration (MIC) and minimum bactericidal or fungicidal concentration (MBC, MFC) were determined for the essential oil at ten concentrations. Finally, the sensitivity of tested microbes to essential oil of H. arenarium was investigated. Results showed that Bacillus subtilis (MIC = 781.25 and MBC = 6250 µg/ml) was more resistance than the two other bacterial species. Among the two yeasts tested, Saccharomyces cereviciae (MIC = 97.65 and MFC = 781.25 µg/ml) was more sensitive than Candida albicans (MIC= 195.31 and MFC= 3125 µg/ml) while among the fungal species, growth of Aspergillus parasiticus inhibited at lower concentration of the essential oil rather than Aspergillus flavus. In liquid medium (Mullerhinton broth), H. arenarium L. essential oil exhibited the same MIC value against both fungal strains (48.82 µg/ml), while in solid medium (Mullerhinton agar) different activity was observed against A. flavus and A. parasiticus with MFC values of 6250 and 390.625 µg/ml, respectively. Results of the present study indicates that H. arenarium L. essential oil has significant (P < 0.05) antimicrobial activity, which strengthen the potential use of these substances as antimicrobial in the future.
ISRN Toxicology, 2012
The aim of this study was to detect the amount of aflatoxin M1 (AFM1) in pasteurized milk samples... more The aim of this study was to detect the amount of aflatoxin M1 (AFM1) in pasteurized milk samples in Mashad in northeast of Iran. For this purpose, 42 milk samples were collected from retail stores during fall 2011 and analyzed for AFM1 by enzyme-linked immunosorbent assay (ELISA) technique. All the analyses were done twice. Results showed presence of AFM1 in 97.6% of the examined milk samples by average concentration of 23 ± 16 ppt and contamination level ranging between 6 and 71 ppt. The concentration of AFM1 in all the samples was lower than the Iranian national standard and Food and Drug Administration limits (500 ppt), and, only in 3 (1.6%) samples, AFM1 concentration was more than the maximum tolerance limit (50 ppt) accepted by European Union and Codex Alimentarius Commission. According to our findings and previous studies, AFM1 contamination of milk is not a concern in this region, and the regional standard of AFM1 contamination in milk might be changed to lower than 100 ppt.
Potravinarstvo Slovak Journal of Food Sciences, 2014
Sodium nitrite has been always considered as one of the common additives due to its antibacterial... more Sodium nitrite has been always considered as one of the common additives due to its antibacterial effects on Clostridium botulinum and meat products' color, however it produces cancer creating nitrosamine. Recently, organic acids and their salts such as lactates have been employed as antimicrobial compounds. Lactates also improve organileptic properties including color, texture and taste and antioxidant properties. Sodium lactate causes to more reduction of anaerobic spore former bacteria than nitrite, inhibits botulin produced by Clostridium botulinum. Sodium lactate produces a permanent reddish pink color through reduction of deoxymygloboline and producing deoxymyoglobuline. In this study, the decrease of sodium nitrite amount from 120ppm to 15ppm by adding sodium lactate / sodium diacetate led to achieve an acceptable product. The best results revealed through adding 3.0625% of sodium lactate / sodium diacetate in combination with 30ppm sodium nitrite. Results also exhibited ...
Sensory acceptability and quality of flavored yogurt enriched with Spinacia oleracea extract
Nutrition & Food Science, 2014
Purpose – The purpose of this paper was to determine the effects of the spinach extract and kiwi ... more Purpose – The purpose of this paper was to determine the effects of the spinach extract and kiwi flavor on the physicochemical and organoleptic properties of yogurt. Design/methodology/approach – A total of 48 yogurt samples including yogurts flavored with kiwi flavor (1, 2 and 4 percent) and colored with spinach extract (1.25, 2.5 and 4 percent) and a control yogurt (no kiwi flavor or spinach extract) were evaluated for chemical, physical and sensory properties during 21 days of storage. Data were analyzed by ANOVA using statistical analysis system. Findings – Statistically significant differences (p<0.05) were found between the control and kiwi-spinach yogurts in terms of viscosity and syneresis. The addition of the spinach extract to yogurt resulted in an increase in the syneresis, and a decrease in the viscosity. During the storage, the values of the titratable acidity, viscosity and syneresis of yogurt samples increased, while pH decreased significantly (p<0.05). Yogurt e...
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Papers by Ali madaouki Maman sani