Effect of teacher student interaction on student achievement in chemistry

According to Da Luz (2015), developing good and supportive learning relationships are needed to create the safe learning environment and gives learners confidence to work without pressure and become motivated to learn effectively in the school. Further, Da Luz said that specifically when school learners are exposed to positive emotional relationships stimuli, they are better able to recall newly learned information. Nielson and Lorber (2009) stressed that learners feel more motivated and stimulated to learn and actively collaborate with the teachers when the classroom is running in a safe and supportive learning environment. The relationships between the teachers and learners affect the quality of students’ motivation to learn and classroom learning experiences (Nielson & Lorber, 2009).

 

Davis (2015) noted that school operating as socializing agents, teachers can influence learners social learning and intellectual experiences via their learning abilities to instil values in the school learners such as effective learning; by providing classroom learning contexts that develops learners learning abilities; and by addressing learners need to belong; and by serving regulatory function for the development of learning talents. Moreover, supportive learning relationships with teachers may play an important developmental role during the transition to and through secondary school level (Davis, 2015). Pianta (2006) concurred with researcher Davis (2015) by claiming that student learning abilities to connect with their teachers is one of the attributes or factors that can make great difference in the student-learning environment. Additionally, Pianta stated that when learners feel that their teachers are supportive, trustworthy people, they tend to create the connection with their teachers and start to see their teachers as someone who is there to protect them and give them all the chances to enhance their academic learning and behave well in the classrooms (Pianta, 2006). Myers and Claus (2012) supported the views of Pianta (2006) by postulating that good classroom learning environment is important because the social learning climate teachers established with learners will provide some opportunities to see themselves as capable, worthy and confident members of the classroom learning setting and make them feel part of the learning process. Additionally, Myers and Claus concludes that the classroom learning environment consists of three overarching dimensions: the learning abilities for learners to develop relationships with their teachers and peers, the extent to which learners participate in the learning activities, and the general structure and order of the classroom learning environment provided by the teachers for conducive teaching and learning atmosphere in the classroom (Myers & Claus, 2012).

Da Luz (2015, p. 389) also supported research findings done by Myers and Claus in (2012), by saying that “when teachers communicate with their learners in a supportive manner, they establish positive classroom learning relationships and interactions in which communication is

 

efficient and characterized by few distortions, effective learning behaviour, and clear message transmission”. In the same line of thinking, Koplow (2002) proposed that effective teacher- learner relationships encourage greater confidence and classroom learning participation in much the same manner as sensitive teaching encourages greater sense of security and confidence. Furthermore, Koplow stated that learners need the confidence and motivation to learn, which could be stimulated by the relationships they hold with their teachers in the school learning environment. In the same vein, Da Luz (2015) agreed with Koplow (2002), views by saying that learners also perform well when they feel that the teacher is passionate about what they are teaching and pass security and confidence to the learners. Lastly, when teachers believe in the student learning abilities to succeed it motivates the teachers, because learners do not want to let the teachers down but it also makes learners believe that they are more capable than they even imagined (Da Luz, 2015). Thus, the researcher supports that teacher-student relationship is very crucial in the school environment, because it helps learners to develop positive learning abilities and self-confidence. This also motivates the teachers to interact positively with learners and enjoying teaching in the classroom

According to Aina, Olanipekun, and Garuba (2015), maintaining positive classroom learning environment for student learning is the responsibility of an effective teacher. Further, Aina et al. (2015) stated that it was easy to distinguish between a teacher who is effective and the one who is not effective by the way, they manage their school classroom environment when the lesson is going on, and managing the classroom well for effective student learning is the task of an effective teacher. Orji (2014) concurred with some scholars like Aina et al. (2015) above by postulating that the ability of the teachers to organize classrooms and manage the behaviour of their learners is central to achieve good educational learning outcomes and foster positive classroom learning relationships. Oliver and Reschly (2007) also affirmed that effective

 

teaching requires among other things basic classroom management strategies and skills which include understanding of the nature of classroom learning environment, and stated that the teachers with problems in the classroom, have poor classroom management and ineffective in their teaching and learning classrooms, and this has negative effect on the student academic learning outcomes (Oliver & Reschly, 2007).

Aina (2013) clarified that an effective teacher will always interact well with learners both within and outside the school-learning environment, because this is very important to enhance students’ academic learning. Furthermore, Aina (2013) stated that positive interactions between teacher and learner in the classroom is very essential, because it contributes to good desired learning outcomes of learners and effective teachers ensure maximum interactions that will improve the students’ academic learning. On the other hand, Orji (2014) reported that lack of adequate interactions between the teacher and learner is one of the reasons why Science learners do not perform very well in the classroom practical activities. Additionally, Orji (2014) also postulated that interest and achievement of learners lies within the teacher and students interactions and relationships in any given subject, and concluded by saying that creating learning environment that develops positive learning cultures with healthy interactions can motivate learners to channel their energies and desires to reach their learning subject’s targets (Orji, 2014).

Knoell (2012) agreed with Orji (2014) views by expressing that teacher-student relationships and interactions is very important in the learning environment, because it makes student learning successful. The relationships and interactions between the teacher and learner is essentially the fundamental basis for effective teaching and learning. Knoell also pointed out that good teacher-student relationship may be even more valuable for learners with good behaviour and learning challenges in the classroom lesson discussions (Knoell, 2012). On the same note, Aina, Olanipekun, and Garuba (2015) found that most learners learn best in the

 

classroom where they are able to freely express their feelings. Moreover, Knoell (2012, p.12) supported and agreed with Aina et al., (2015) sentiments by saying that learning occurs best in the learning environment that contains positive interpersonal relationships and interactions and in which learner feels more appreciated, acknowledged, respected, and admired. Furthermore, Knoell argues that learners who enjoyed close and supportive learning relationships with teachers are more involved, works harder in the classroom learning, persistence in the face of difficulties, and cope better with the learning challenges in the classroom activities (Knoell, 2012).

According to Liberante (2012), the effect of teacher-student relationships on the student learning has received significant attention, and the teachers do have vital role to play in determining and assisting students to achieve their learning success goals. Furthermore, Liberante states that in order for learners to be successful in their academic learning, a momentous teacher to learner relationships has been noted to be an essential element. On the same note, Liberante (2012) also pointed out that the complexity in learner to teacher relationships results into negative and poor academic learning on the learners (Liberante, 2012). According to Orji (2014), good quality teaching and learning is connected with positive student academic learning feelings and behaviour in the classroom-learning environment. In the same vein, Knoell (2012) agreed with Orji (2014), opinions by further explaining that good quality teachers are not termed just machines that are well greased or lubricated but they are known to be teacher emotional and enthusiastic individuals control who relate well with their learners and create pleasurable working relationships and positive classroom learning environment with creativity, challenges and happiness for student academic learning success (Knoell, 2012).

Moreover, Orji (2014) argues that the close emotional relationships between the teachers and learners have positive effect on the student learning. For instance, learners need to recognize the benefits of the classroom-learning environment as their home, even though the classroom

 

is away from the learners’ home. The teachers’ time devotion to learners’ academic learning has been of great assistance in inspiring learners to attain their academic learning targets/goals and passing requirements of secondary school level (Orji, 2014). Nugent (2009) postulated that if teachers take the initiative to build supportive relationships with learners, they motivates learners to learn effectively and this will improve the student learning positively. In addition, Nugent also argued that further research suggested that teachers need to possess strong belief that creating relationships plays significant role in the process of motivation towards student academic learning. Orji (2014) noted that all the teachers familiarised with the effects they have on their students’ academic learning, and strongly restore in mind their perception of learners towards them. According to Liberante (2012) teachers have to make sure that there are learners needs, not only academically learning but emotionally as well, and developing good classroom learning environment that channels positive learning cultures with healthy relationships that encourages learners to use their energies, desires and work very hard to achieve their academic learning goals (Liberante, 2012).

PRODUCTION OF GREEN SILICATE (RICE HUSK) FOR TREATMENT OF WASTE WATER

Rice husk (RH) is one of the abundant agricultural biomasses in nature which received an increased attention recently, due to availability and cheapness of resource. Approximately 20% of rough rice mass is husk which contains hemicelluloses, cellulose, lignin, and the other inorganic elements (Phonphuak and Chindaprasirt 2015). Utilization of RH to produce advantageous materials is of great importance in the control of air pollution. The main inorganic component of rice husk ash (RHA) is silica, and other components including Al2O3, K2O, Na2O, CaO, MgO, and Fe2O3 may subsist in a little proportion (Azat etal. 2019). RHA has multidisciplinary applications as a source of silica in the fabrication of advanced materials such as mesoporous silica (Costa and Paranhos 2018), dental nanocomposite (Noushad etal. 2014), and zeolites (Panpa and Jinawath 2008). One effective application of RH is the fabrication of silica with developed porosity by different chemical routes to apply in the removal of contaminants like heavy metal ions and dyes from wastewater (Chuah etal. 2005; Pham etal. 2020).

The non-isothermal decomposition of RH in the air atmosphere is the facile technique to produce the nano-structured silica with the high specific surface area (Liou 2004). The silica extracted from RH by mild hydrochloric acid solution contains the micro- and nano-metric particles (Carmona etal. 2013). The purity of powder fabricated in the presence of hydrochloric acid is due to deletion of impurities (Costa and Paranhos 2018).

The pre-treatment by citric acid is an efficient method for the fabrication of silica with the high purity, declining the environmental impact (Azat etal. 2019). Oxalic acid was found to be the best acid for the synthesis of silica aerogel from RH (Temel etal. 2017). The control of reaction factors such as ethanol/water ratio, and pH in the sol-gel process,

EXTRACTION AND PHYTOCHEMICAL SCREENING ON BRIMSTONE

EXTRACTION AND PHYTOCHEMICAL SCREENING ON BRIMSTONE

CHAPTER ONE/INTRODUCTION

Scientific classification of Morinda lucida Benth Family: Rubiaceae

  • Subfamily:       Rubioideae 
  • Tribe:              Morindeae
  • Genus:               Morinda
  • Species:              Morinda lucida Benth

Vernacular names English: Brimstone trees. Igala: Ọgẹlẹ

Yoruba: Oruwo Ibo: Nfia Ebira: Ugigo

The family, Rubiaceae 

Rubiaceae is a family of flowering plants, variously called the madder family, bedstraw family or coffee family. The family takes its name from the madder genus Rubia. The plants included in the family are Cofea arabica, Morinda lucida, Cinchona (whose bark contains quinine). The Rubiaceae is one of the five largest plant families, including Orchidaceae, Compositae, Leguminosae, and Gramineae. The family includes trees, shrubs, climbers, herbaceous plants and ant plants. Rubiaceae is subdivided into four subfamilies, namely Rubioideae, Cinchonoideae, Ixoroideae and Antirheoideae with about 50 tribes. According to the world Rubiaceae checklist, there are 611 genera and 13,143 species (Davis et al., 2009). Psychotria, with 1834 species is the largest genus in the family. With many large and poorly defined genera, the family was not extensively researched as others. According to Karou et al. (2011). Rubiaceae are used as ornamental trees and in African folk medicine to treat several diseases including malaria, hepatitis, cough, hypertension, diabetes and sexual weakness. Following leads supplied by traditional healers, biological screening have shown many of the plants to possess antimicrobial, antidiabetic, antihypertension, antioxidant and anti-inflammatory activities. The family consists of many genera that serve as valuable medicinal plants. According to Karou et al. (2011), great attention has been paid to species such as Nauclea latifolia, Morinda lucida, Mitragyna inerms and Crossopteryx febrifuga but these plants have not been systematically studied and so, several compounds should be waiting to be discovered.

Phytochemicals are non-nutrient plant chemicals that contain protective, disease-preventing and curative compounds capable of bringing about physiological changes((Liu A G, Volker S E, Jeffery E H, Erdman J W Jr (2009). Feeding tomato and broccoli powders enriched with bioactives improves bioactivity markers in rats. Agric. Food Chem. 1: 22-28)) ((Abo K A, Ogunleye V O, Ashidi J S (1991). Antimicrobial potential of sporidias mombin, croton zambericus and zygotritonia crocea. Pharmacol. Res. 5 (13) : 494-499)) Woody plants and herbs synthesize and accumulate in their cells large variety of these phytochemicals ((Close D C, Arthur C (2002). Rethinking the role of many plant phenolics protection from photodamage. Oikos, 99: 166-172)).Phytochemicals have been isolated and characterizedfrom fruits such as grapes and apples, vegetables such as broccoli and onion, spices such asturmeric, beverages such as green tea and red wine, as well as many other sources((Cousins D, Huffman M A (2002). Medicinal Properties Evaluation. African Studies Monographs 23 (2) : 65-89)). These phytochemicals in traditional medicinal plants are capable of curing ailments like fever, asthma, constipation, oesophageal cancer and hypertension etc.Different plant parts and components have been employed in the treatment of infectious pathologiesin the respiratory system, urinary tract, gastrointestinal and biliary systems, as well as onthe skin ((Adekunle A S, Adekunle O C (2009). Preliminary Assessment of Antimicrobial Properties of Aqueous Extract of Plants against Infectious Diseases. Med. 1 (3): 20-24))

 

ADSORPTION OF HEAVY METALS FROM AQUEOUS SOLUTIONS USING MANGROVES

ADSORPTION OF HEAVY METALS FROM AQUEOUS SOLUTIONS USING MANGROVES

Chapter One/Introduction

Heavy metal release to the environment has been increasing continuously as a result of industrial activities and technological development, posing a significant threat to the environment, public and soil health (Cerbasi and Yetis; 2001). Among the heavy metals released into environment, chromium is an important pollutant. Chromium is a redox active element, with oxidation states from –2 to +6, but only the +3 and +6 states are prevalent in the aqueous environment. Cr(III) and Cr(VI) are environmentally stable oxidation states and exhibit different types of toxicity mechanism on biota. Chromium is released into the environment by a large number of industries such as mining, iron sheet cleaning, chrome plating, leather tanning and wood preservation (Krishna and Philip; 2005). These industries contains Cr(III) and Cr(VI) at a concentration ranging from 10 to 100 mg/L (Park et al; 2005). Long-term release of such wastewater may result in the accumulation of heavy metals in soil exerting a selection pressure on soil micro-biota. Cr(VI) is a highly soluble and toxic chromate anion, and is a suspected carcinogen and mutagen (Costa; 2003). Also the wide use of chromium (Cr) by modem industries has resulted in a large quantity of this element being discharged into the environment via air emission, waste water or land disposal. One of the important sources of the Cr in the waste water is due to the use of chromates in cooling water for corrosion control. Cr may exist in water in both hexavalent and trivalent states. Trivalent Cr has a lower toxicity than that in the hexavalent state.

Important sources which add chromium (Cr) to the environment are: Ferro-chromium production units, refining of ores, chemical industries and the combustion fossil fuels. In rural areas chromium content in ambient air is usually less than 0.1 ~g/cubic meter, while in industrial areas it may range from 0.01-0.03 pg/cubic meters. Particulate ejected from coal fired power generation plants may contain 2.3-32 ppm of chromium. Waste waters from tanneries may contain 10-50 ppm, textile wastes up to 32 ppm while spent chrome liquors may contain up to 4500 mg/litre of Cr. Only trivalent and hexavalent forms of Cr are of biological significance. Trivalent Cr is the most common form of the metal in nature and it is in this state the metal almost always occurs in a living system. Hexavalent Cr is capable of crossing the cell membrane and is rapidly reduced to trivalent state inside a living cell. Small quantities of trivalent Cr are essential to carbohydrate metabolism in mammals while it is also a co-factor for action of insulin. A little amount of Cr is helpful in improving glucose tolerance in diabetic patients, weak and old individuals. Most of the mammals can tolerate almost a hundred times more Cr in trivalent state than their usual body burden without any toxic effects. Acute Cr toxicity causes serious renal tubular necrosis. Exposure to hexavalent Cr has been found to cause dermatitis, allergic skin reactions, chronic ulceration and injury to nasal septum, gastrointestinal ulcers etc. Chronic Cr toxicity has been associated with incidence of cancers of respiratory track in occupationally involved workers. Both forms of Cr (hexavalent and trivalent) are considered equally
3 potent carcinogenic agent. In view of the paradoxical role of the Cr, as an essential micronutrient in human and animal nutrition at low concentrations, and a known carcinogen at the elevated levels, there is a growing concern about the fate and effects of Cr in the environment. The conventional methods for removing Cr (VI) ions from wastewater are based on the combination of different physical and chemical reduction processes (Kurniawan et al; 2006). However, such processes are becoming undesirable due to the use of expensive and toxic chemicals.

Further these methods are also inefficient in the removal of Cr(VI), particularly with wastewater containing with a low Cr concentration and also associated with the production of secondary effluents (Baral and Engelken, 2002). Prakasham et al., (1999) and Kadimpati et al. (2013) suggested that the removal of heavy metals by adsorption on various biomass surfaces is the best alternative to the physico and chemical methods. In recent years, many researchers used the various bio-materials such as tea factory waste (Cay et al. 2004; Malkoc and Nuhoglu 2005, 2006), sawdust (Acar and Malkoc 2004; Yu et al. 2003), soya cake (Daneshvar et al; 2002), sugarcane bagasse (Gupta and Ali 2004), green algae (Gupta et al. 2001; Malkoc and Nuhoglu 2003), distillery sludge (Selvaraj et al. 2003) for removal of heavy metals from waste waters. Most of the low-cost sorbents have the limitation of poor sportive capacity, and thereby, for the same degree of treatment it generates more solid waste (pollutant laden sorbent after treatment) leading to disposal problems. Therefore, there is a need to explore low cost, economically viable and effective sorbent, having high pollutant sorption capacity (Ho et al. 2005)

 

Treatment of palm oil mill effluent using anaerobic system

Treatment of palm oil mill effluent using anaerobic system

Abstract

Large volumes of untreated palm oil mill effluent (POME) pose threat to aquatic environment due to the presence of very high organic content. The present investigation involved two pilot-scale anaerobic expanded granular sludge bed (EGSB) reactors, continuously operated for 1 year to treat POME. Setting HRT at 9.8 d, the anaerobic EGSB reactors reduced COD from 71179 mg/L to 12341 mg/L and recycled half of sludge by a dissolved air flotation (DAF). The average effluent COD was 3587 mg/L with the consistent COD removal efficiency of 94.89%. Adding cationic polymer (PAM) dose of 30 mg/L to DAF unit and recycling its half of sludge caused granulation of anaerobic sludge. Bacilli and small coccid bacteria were the dominant microbial species of the reactor. The reactor produced 27.65 m3 of biogas per m3 of POME which was utilized for electricity generation.

 

 

Quantitative determination of caffeine and taurine in some non branded energy drinks

Quantitative determination of caffeine and taurine in some non branded energy drinks

CHAPTER ONE/INTRODUCTION

Energy drinks refer to beverages that contain large doses of caffeine and other legal stimulants such as taurine, carbohydrates, glucuronolactone, inositol, niacin, panthenol, and β-complex vitamins which are considered as source of energy (Attila and Çakir, 2009). The consumption of readily available energy drinks has increased significantly with young adults forming the largest part of the consumers. History of energy drink dates back to 1987 when Red Bull was introduced in Austria. It became more popular in the 1990s following its introduction to the United States. Since then the sale of this drink has increased exponentially. In 2006, the energy drink market grew by 80% (Foran et al., 2011). This is because manufactures claim the drinks can boost energy levels as well as physical endurance, improve concentration and reaction speed (Van den Eynde et al., 2008).

In recent years, a number of different energy drinks have been introduced in the Nigerian market to provide an energy boost or as dietary supplements. These drinks are marketed specifically to children and young adults. These products have been used for various reasons. A survey conducted among college students shows that 67% of students admitted using energy drinks to cope with insufficient sleep, 65% mentioned increasing energy and 54% use it for fun at parties; 50% for studying or completing a major course project, 45% used it while driving a car for a long period of time and 17% for treating hangover (Malinauskas et al., 2007). These products have also been used to reduce the depressor effect of alcohol or even to gain social status (Ferreira et al., 2004; Kaminer, 2010).

Many energy drinks are promoted as being nutraceutical foods, boosting health, energy, or otherwise having sought-after benefits. There is some concern among health professionals that these beverages, and the drinking behaviours of the targeted consumers, may in fact have adverse health consequences. The most commonly reported adverse effects include insomnia, nervousness, headache, and tachycardia (Clauson et al., 2008). In a recent study, heavy consumption of energy drinks was attributed to new onset seizures in four patients (Iyadurai and Chung, 2007) and hospitalization of individuals with pre-existing mental illness (Chelben et al., 2008).

Energy Drinks

Energy drinks first appeared in Europe and Asia in the 1960s in response to consumer demand for a dietary supplement that would result in increased energy (Reissig et al., 2008). In 1962, a Japanese company, Taisho Pharmaceuticals, launched Lipovitan D, one of the very first energy drinks, which is still dominating the Japanese market. Since the 1960s, the energy drink market has grown into a multibillion dollar business which has been reported as being the fastest growing segment in the beverage industry. Energy drinks have established a viable position in the beverage market as evidenced by their commonplace consumption in the morning, afternoon, and night, not only by the general consumer, but those of age 18 to 34 in particular (Lal, 2007).

The popularity of energy drinks and the growth in their consumption among adolescents and young adults have brought worries regarding general health and well being of these consumers. Adolescents and young adults are often uninformed about the content  of energy drink (Rath, 2012).

Contents of Energy Drinks

There are hundreds of energy drinks available in the market, many share very similar ingredient profiles. Most of these energy drinks consist mainly of caffeine, Taurine, Guarana, Ginseng, B vitamins, Ginko Biloba, L-carntine, sugars, Antioxidants, Glucuronolactone, Yerba Mate, Creatine, Acai Berry, Milk Thistle, L-theanine, Inositol and artificial sweetners (Babu et al., 2008).

Caffeine

Caffeine is probably the most frequently ingested pharmacologically active substance  in the world. It is one of the main ingredients of stimulant drinks and it is also present in tea, coffee and other beverages and foods. Caffeine is extracted from the raw fruit of over sixty species of coffee plants (coffea Arabica), all part of the methylxanthine family. The dimethylxanthine derivatives, theophylline and theobromine, are also found in a variety of plants. It is also extracted from tea, kola nuts, and cocoa. The average total intake of caffeine in the Republic of Ireland and the UK is estimated to be 214 and 278 mg per person per day, respectively (FSPB, 2010). Data from the consumption survey, based on weekly intake, indicates that among stimulant drink consumers, the average daily caffeine intake from stimulant drinks alone would be approximately 35 mg, rising to about 90 mg among the highest consumers (FSPB, 2010). This does not appear excessive. However, when the consumption of stimulant drinks in a single session was investigated, the average caffeine consumed was approximately 240 mg (3 cans), rising to about 640 mg (8 cans) among the highest consumers (FSPB, 2010). Such large intake levels among the highest consumers are a cause of concern, particularly in relation to the known potential acute health effects of caffeine such as tachycardia, increases in blood pressure and dehydration, as well as behavioural and cognitive effects. The health effects of chronic or habitual caffeine consumption remain uncertain.

Taurine

 Taurine (2-aminoethyl sulfonic acid) is a sulfur containing amino acid that is the most abundant amino acid found naturally in our bodies, primarily in the retina and skeletal and cardiac muscle tissue (Timbrell et al., 1995; Imagawa et al., 2009). Taurine is derived from the metabolism of methionine and cysteine (Huxtable, 1992; Stipanuk, 2004). It is also present in common food items such as meat and fish. The data on stimulant drink intake among stimulant drink consumers indicate that average daily taurine intake from stimulant drinks was approximately 0.4 g, increasing to about 1 g among the highest consumers (FSPB, 2010). The most taurine consumed from stimulant drinks in a single session was averaged at approximately 3 g, rising to about 8 g by the highest consumers (FSPB, 2010). Stimulant drink intake at the maximum level of intake provides taurine far in excess of that from other foods or beverages in the diet. Data available indicate no evidence of adverse effects of taurine at such intakes and in a recent report the EU Scientific Committee for Food (SCF) was unable to conclude that the ‗safety-in-use‘ of taurine in the concentration range reported for stimulant drinks has been adequately established (EU SCF, 1983).

Justification

Energy drinks have established an enviable position in the beverage market as evidenced by their commonplace consumption. There are a number of scientific reports on the adverse consequences of excessive consumption of these drinks. Many of these products do not provide the complete chemical composition, and the caffeine content and other ingredients present are unknown to the consumer. Hence there is need to quantify the major content of these energy drinks and compare with those of accepted standards. Also, energy drinks occur mostly in liquid and powdered forms. There has been little or no research on the powdered products as more attention has been given to those in liquids.

These powdered products are usually dissolved in water by consumers before intake. It is therefore imperative to determine the caffeine, aspartame and other energizers of the powdered products and compared them with those of the liquid products. It will also be necessary to determine some other physicochemical properties of the energy drinks.

Aim and Objectives

The aim of this work is to carry out comparative study on Quantitative determination of caffeine and taurine in some non branded energy drinks This will be achieved through:

  1. determination of the caffeine and aspartame concentrations of the energy drinks;
  2. determination of the carbohydrate (sugar) contents;
  3. determine the physicochemical properties of energy drinks;
  4. determination of the level of heavy metals (Cu, Zn, Pb, Cd, Mn, Fe) in them;
  5. determination of micronutrients (K, Ca,) present in them;
  6. using Statistical Analysis to analyse and compare between the powdered and liquid forms of energy drinks;
  7. comparing the obtained results with set standards by regulatory bodies

Comparative study of chemical and physiochemical properties of borehole and table water

Comparative study of chemical and physiochemical properties of borehole and table water in girei LGA and jimeta metropolis

Abstract

The aim of this study is the assessment of physical and chemical characteristics of different commonly used water sources, including boreholes and table water. Thirty samples of water were collected and the following physical and chemical parameters was measured: temperature; electrical conductivity; pH; nitrate; nitrite; fluoride; chloride; ammonium and Zinc. The mean values of the different measured samples were compared with the World Health Organization (WHO) Guideline Values (GVs) for drinking water quality. One-way analysis of variance (ANOVA) and the DUNCAN’s multiple comparison test for significant differences, including Principal Component Analysis (PCA) was also applied to all the measured parameters. The results showed that pH, ranging from 6.028 ± 0.64 to 6.58 ± 0.30 for both wells’ water and borehole waters indicate a measure of acidity. With respect to chemical parameters, zinc ions were higher than the WHO GV in all water sources as well as ammonium ions in rivers’ water. Based on the analyzed parameters, quality of these different water sources is chemically acceptable

Determination of levels of polycyclic aromatic hydrocarbon in soil contaminated with spent motor engine oil

Determination of levels of polycyclic aromatic hydrocarbon in soil contaminated with spent motor engine oil

ABSTRACT:

Soil samples contaminated with spent motor engine oil collected from Abakaliki auto-mechanic site were analyzed to determine the concentration of polycyclic aromatic hydrocarbon (PAH) components which are often targets in environmental check. Identification and quantification of the PAH components was accomplished using a gas chromatographic system (6890 series and 6890 plus) equipped with a quadrupole Mass Spectrometer (Agilent 5975 MSD) after ultrasonic extraction of the sample and clean up of the extract. The results showed that out of the sixteen USEPA target PAHs (EPA-16) assayed, only six were detected in varying concentrations in mg/kg. These include Phenanthrene with concentration range of 0.0172 ± 0.01 to 0.0193 ± 0.02, fluorene (0.0189 ± 0.01), benzo[a]anthracene (0.0162 ± 0.05), chrysene (0.0209 ± 0.02), benzo[b]fluoranthrene (0.0453 ± 0.02) and benzo[k]fluoranthrene (0.0389 ± 0.1). The concentration of total PAH components detected in the samples ranged from 0.0184 ± 0.02 to 0.1385 ± 0.2 mg/kg. Implications of PAHs on health were discussed

Detection of quinolone resistance from nosocomial pathogens

Detection of quinolone resistance from nosocomial pathogens

INTRODUCTION

INTRODUCTION

Fluoroquinolones  have  been  frequently  prescribed  as  empirical  therapy  against  mosthospital  and  community  infections  due  to  increased  appearance  of  multiple  drug  resistantGram negative bacteria includingKlebsiella pneumoniaeand to the disease severity.Withextensive  clinical  use  of  quinolones.  Fluoroquinolone  resistance  has  been  a  problem  inclinical  medicine  for  its  limiting  of  available  agents  in  the  treatment  of  many  types  ofinfection.Quinolone   resistance   in   the   family   Enterobacteriaceae   is   mostly   attributed   to   theaccumulation  of  mutations  in  the  bacterial  enzymes  targeted  by:  DNA  gyrase  and  DNAtopoisomerase IV. In addition  Active efflux systems (acrAB-TolC) resulting in decreasedintracellular   accumulation   of   fluoroquinolones   inK.pneumoniae.Morever,Plasmid-mediated  quinolone  resistance  (PMQR)  with  the  potential  for  horizontal  transfer  has  beendescribed along with three mechanisms: (i) a quinolone-protective mechanism encoded by theqnrgenes(3); (ii) a modifying enzyme, aac(60)-Ib-crand (iii) an efflux pump encoded by theqepAgene(5,6).   Plasmid-encoded   quinolone   resistance   determinants   confer   low-levelresistance,  but  their  presence  could  potentially  facilitate  the  evolution  of  the  bacterial  hosttoward  higher  levels  of  resistance  by  mutational  alterations  in  type  II  topoisomerases.K.pneumoniaestrains represent an incredibly great epidemic potential and are one of the majorsources   of   horizontally   spreading   antimicrobial   resistance(2).Fluoroquinolone   resistantK.pneumoniaeconstitutes one of the most common Gram-negative bacteria showing multipleantibiotic  resistance  worldwide

Extraction of flavonoid from mangifera indicate, anti microbial and antioxidants

Extraction of flavonoid from mangifera indicate, anti microbial and antioxidants

Abstract

The use of and search for drugs and dietary supplements derived from plants have accelerated in recent years. Ethnopharmacologists, botanists, microbiologists, and natural-products chemists are combing the Earth for phytochemicals and ?leads? which could be developed for treatment of diseases. This study was designed to evaluate both the antioxidant/free- radical scavenging activities and antimicrobial activity of mango ( Mangifera indica L.) ripe peel. The extraction was done by individual cold percolation method using various solvents (like petroleum ether, acetone, methanol and water) of increasing polarity. The antioxidant activity was evaluated using six antioxidant assays like 2, 2-diphenyl-1-picryl hydrazyl free radical scavenging assay, hydroxyl radical scavenging assay, superoxide anion radical scavenging assay, ABTS cation radical scavenging assay, ferric-reducing antioxidant power and reducing capacity assessment. Total phenol and flavonoid content was also measured. Antimicrobial activity was done by agar well diffusion method against 25 microorganisms. The MIC and MBC was also measured against selected bacteria. Acetone extract showed best antimicrobial and antioxidant activity and can serve as a potential source of antioxidants and antimicrobics for use in the preparation of dietary supplements or nutraceuticals, food ingredients, pharmaceutical, and cosmetic products. The results indicate that this peel possesses nutraceutical potential for the treatment of malnutrition.