Natural & Applied Sciences

Research Papers/Topics in Natural & Applied Sciences

MECHANOCHEMICAL SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITIES OF BENZYL-N,N-DIMETHYL DITHIOCARBAMATE AND ITS FE3+ COMPLEX

ABSTRACT The strategy of utilizing mechanochemical synthesis to obtain metal-organic frameworks with high surface area and nanodisperse particles has been espoused. Transition metal ions have been shown to form complexes with organic moieties such as benzyl-N,N-dimethyldithiocarbamate. It has been established that iron in its oxidised state (Fe3+) is cidal to microorganisms and dialkyldithiocarbamates have an established antifungal activity, the complex of Fe3+ and benzyl-N,N-dimethyldithioc...

On the Stability of Endemic Equilibrium State of HIV/AIDS Model with Irresponsible Infective Immigrants

ABSTRACT In this paper, a non–linear mathematical model is proposed to study the effects of irresponsible infected immigrants on the spread of HIV/AIDS in a heterogeneous population with a constant recruitment of susceptible receptors. Theequilibrium points, stability analysis, and numerical solution on the model are presented. The Routh–Hurwitz stability condition was employed to examine the stability of the disease– free equilibrium and Next Generation matrix was adopted to g...

MATHEMATICAL MODELING OF THE EFFECT OF IRRESPONSIBLE IMMIGRANT ON THE TRANSMISSION DYNAMICS OF HIV

ABSTRACT This project proposes a non – linear mathematical model to study the effect of irresponsible infected immigrants on the spread of HIV/AIDS in a heterogeneous population with a constant recruitment of susceptible. The equilibrium points, stability analysis and numerical simulation on the model are presented. It is realised that at the disease – free equilibrium, the model is stable when the basic reproduction number R0

MODELING CHOLERA DYNAMICS WITH CONTROLS

ABSTRACT.  In this paper, we present and analyze a cholera epidemiological model with control measures incorporated. This model is extended from the one proposed in [16] by including the effects of vaccination, therapeutic treatment, and water san- itation. Equilibrium analysis is conducted in the case with con- stant controls for both epidemic and endemic dynamics. Opti- mal control theory is applied to seek cost-effective solution of multiple time-dependent intervention strategies against ...

Mathematical Modelling Of Hiv/Aids Dynamics With Treatment And Vertical Transmission

ABSTRACT This study proposes and analyzes a non-linear mathematical model for the dynamics of HIV/AIDS with treatment and vertical transmission. The equilibrium points of the model system are found and their stability is investigated. The model exhibits two equilibria namely, the disease-free and the endemic equilibrium. It is found that if the basic reproduction number R0 1, the disease-free equilibrium is always locally asymptotically stable and in such a case the endemic equilibrium doe...

Effect of Computer-Instructional Package on the Performances of Senior Secondary Students in Quadratic Equations in Bida Educational Zone of Niger state, Nigeria.

Abstract This study investigates the Effect of Computer- Instructional Package (COMPUTER INSTRUCTIONAL PACKAGE) on the Performance of Senior Secondary Students in Quadratic Equation in Bida Educational Zone of Niger State, Nigeria. The study examined the significant of performances of students thought using computer instructional package andLecture method. The sample consisted of 120 senior secondary school students drawn from four secondary schools. Stratified random sampling was used to se...

THE RELEVANCE OF MATHEMATICS AS A CORE SUBJECT IN SENIOR SECONDARY SCHOOLS IN NSUKKA LOCAL GOVERNMENT AREA OF ENUGU STATE.

INTRODUCTION The 21st century requires equipping children with basic education in literacy and numeracy, as the more advanced completes skills needed for living that can serve as the foundation of life, enabling the children to adapt and change life abetting to life changing circumstances. Basic education remains the most important factor that enables the very process in enhancing knowledge, skills and attitudes needed for societal and national growth of any country of the world. Learning is...

RELEVANCE OF MATHEMATICS AS A CORE SUBJECT IN SENIOR SECONDARY SCHOOLS IN NSUKKA LOCAL GOVERNMENT AREA OF ENUGU STATE

ABSTRACT This project studied the relevance of Mathematics as a core subject in senior secondary schools in Nsukka Local Government Area of Enugu State. The following research questions were posed to help the researchers in conducting this research: what are the benefits of teaching Mathematics in schools? Are adequate instructional materials used in the study of the subject? Are teachers encouraged to teach the subject matter? Is Mathematics relevant to other subjects? The information fo...

COMPARATIVE STUDY ON THE PRODUCTION OF WOOD PELLETS FROM SAWDUST USING LOCALLY SOURCED BINDERS.

ABSTRACT   Attempt was made to produce wood pellets from sawdust using locally sourced binders as an alternative binder, to wood lignin which is a natural binding agent. Wood pellets were produced by manual moulding with starch concentration of cassava and potato starch as the process variable. Results show similar behavior between pellets bonded by cassava, and potato starch, But differs slightly in the case of calorific value and smoke analysis, it shows that smouldering produce the highes...

THE EFFECTS OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF A WELDED JOINT OF MEDIUM CARBON STEEL

ABSTRACTThe effect  of Heat treatment on the Mechanical Properties of a welded joint of medium carbon steel has been carried out.  The materials were cut, welded, to get 27 samples needed. Thereafter, Heat Treatment was carried out on the samples. Then the specimens were grouped into two groups, group A and group B. In group  A, after the heat treatment on the welded specimens, one sample was quenched in water immediately, another was oil-quenched and the third one was allowed to cool unde...

Synthesis And Characterization Of Nanocalcium Titanate (Perovskite)

ABSTRACTAccording to a few recent studies, calcium titanate is a material that is similar to hydroxyapatite in biological properties. However, calcium titanate is not currently being used in the biomedical application as to hydroxyapatite. The objective is to prepare nano calcium titanate powder from the solution of calcium oxide, ethanol, and titanium (IV) isopropoxide via sol-gel synthesis. The fiber size, pore size and morphology were studied by phenom scanning electron microscope (SEM). T...

Chemical composition and biological activity of Allium sativum essential oils against Callosobruchus maculatus

ABSTRACT In order to search for alternative control methods to synthetic pesticides, the potential of essential oils from Allium sativum (L.) (Alliaceae); was evaluated as fumigants against Callosobruchus maculatus (fab.) (Coleoptera: Bruchidae), a pest that attacks pulses during storage. Chickpea seeds were infested with 10 pairs of newly emerged weevils and, fumigated with 0, 1, 2, 3, or 4μl of essential oils of garlic/l of air. The essential oils of garlic were analyzed by GC-MS. The majo...

PRINCIPLES OF CARBON-U (C-11) RADIO-CHEMISTRY

ABSTRACTCarbon –U (C-11) radiotracers are widely used for the early diagnosis of cancer, monitoring therapeutic response to cancer treatment and pharmacokinetic investigations of anticancer drugs. PET imagining permits non-invasive monitoring of metabolic processes and molecular targets, while carbon-II radiotracers allow a “hot-for cold” substitution of biological active molecules. Advance in organic synthetic chemistry and radiochemistry as well as improved automated techniques for ra...

Effect of dye and bleaches on hair

1.0    INTRODUCTIONHair coloring is the practice of changing the hair color. The main reasons for this are cosmetic, to cover gray hair, to change to a color regarded as more fashionable or desirable, to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching. Hair dyes generally contain dyes, modifiers, antioxidants, alkalizers, ammonia and a mixture of other compound used to impart different qualities to hair depending on the hair type, col...

ANALYSIS OF DIFFICULTY LEVEL OF THE COURSE IN NIGERIA CERTIFICATE IN EDUCATION (NCE) CHEMISTRY CURRICULUM: PRE-SERVICE TEACHERS PERSPECTIVES IN GOVERNEMNT OWNED COLLEGES OF EDUCATION IN ENUGU

INTRODUCTION  Chemistry is one of the essential science subjects. According to Oxford Advanced Learners Dictionary (2008), chemistry is the branch of science that deals with the composition and properties of substances and various elementary forms of matter. Mifflin (2011) defined chemistry as the science of the composition, structure, properties and reactions of matter especially of atomic and molecular systems. Sarah (2015) defined chemistry as a physical science and the study of the prop...


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