Science essays

Abstract : We are concerned about the energy resolution and the photopeak efficiency of a different scintillation detectors ; to be specific we are testing the Nal and LaBr crystals . We used Na22 as a gamma source .For LaBr we had a 15.81% Energy Resolution , Nal-1 has 35.75% , Nal-2 has 27.30% . … Read more

A quantitative review of research on the influence of the carbon dioxide concentration and temperature on the toxin content of the dinoflagellate Alexandrium to see if there is a general trend Supervisors: Preface In this thesis a review of the existing articles about the influence of climate change on the toxicity of harmful algal blooms … Read more

Alcohol is one of the most used substance of abuse. In western countries around 80% of the adult population consumes alcohol1. Although the majority can consume alcohol in a controlled manner some individuals develop problematic levels of alcohol consumption. The individual differences in alcohol consumption form a substantial part of the problem. Detailed analyses are … Read more

ABSTRACT Chlorella variabilis grown in hypersaline environment (3-8 ��Be) in open solar salt pans during the summer season at temperature 45��3��C showed promising results towards development of renewal energy. A total of 746.23 Kg dry biomass generated during the cultivation period with average calorific value of 3885 kCal/kg and an average biomass productivity of 34.59 … Read more

Instrument LC 2010 Shimadzu, Japan Chromatographic Conditions: Mobile phase: 10 Mm monobasic phosphate pH 2.45 adjusted with O’phosphoric acid containing 0.1% V/V triethylamine and acetonitrile (70:30) Absorption maxima: 227nm Injection Volume: 20??l Column: C-18, dimension 250 ?? 4.6 mm, 5 ?? from Phenomenex Flow rate: 1.4ml/min. Preparation of diluent: 0.1 N HCl and acetonitrile in … Read more

Introduction Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes. It includes investigations of how different experimental conditions can influence the speed of a chemical reaction. Chemical kinetics deals with the experimental determination of rates from which rate laws and rate constants are derived. Relatively simple rate laws exist … Read more

Oxygen Indicator is a means of detecting the presence of Oxygen. These indicators are of great importance especially to the food packaging industry. Oxygen is considered as one of the main causes of spoiling of food. Oxygen reacts with food causing oxidative rancidity, making the food foul to smell and harmful to eat. Therefore, its … Read more

Introduction Histopathology is a microscopic study; it is used to assess the manifestation of diseases and evaluation of the organ structure. This is reflecting the morphological structure of the cells and tissues. The parasites are an important group of pathogen causes infection and diseases to the fish both in fresh water and marine fishes. Formerly … Read more

2, 3′, 4, 4′, 5- Pentachlorobiphenyl Induces Inflammatory Responses in Thyroid through a JNK and Aryl Hydrocardon Receptor Mediated Pathway Abstract Polychlorinated biphenyls (PCBs) are persistent and widely distributed environmental pollutants that can compromise normal functions of multiple organs and systems, one important mechanism is the induction of inflammatory disorders. In this study, we investigated … Read more

Abstract A cross sectional study was conducted in Zirobwe meat producers’ cooperative society in Zirobwe sub county, Luwero district in central Uganda to determine the seroprevalence of brucellosis and leptospirosis and study the risk factors associated with the diseases. A total of 140 serum samples were randomly selected from 28 member farms using the automatic … Read more

Mono-propellants Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) and 1,3,5- Trinitroperhydro-1,3,5-triazine (RDX) share multiple physical and chemical properties. Experimental data shows that both propellants have similar burning rate exponents, flame structures, and final flame temperatures at ambient temperatures [1, 2]. Data also shows that the temperature sensitivity for RDX and HMX is relatively flat with a magnitude of approximately 0.15%/K … Read more

Abstract Lots of biometrics primarily based instruments tend to be under progress to meet up with the actual difficulties in security within the current complicated situation. Between these kinds of iris template based recognition may be the most promising to its stableness, trustworthiness, individuality, noninvasiveness and also protection through replication. Therefore the particular iris recognition … Read more

Abstract – The key problem in navigation now is to establish vehicle position (if cars, planes or ships), this operation is performed by several methods: (1) by observing the environment, (2) using the stars (celestial navigation),(3)estimate (measurement of speed and direction of travel) and (4) by electronic means. Electronic positioning processes are: (a) using radio … Read more

Antimicrobial resistance (AMR) is an expanding problem and according to the World Health Organization (WHO), is on track to become a major barrier to global health. Antimicrobial resistance is defined as resistance of certain microorganisms to antimicrobials originally designed to treat them. The threat is so serious; AMR is on course to reverse modern medicines’ … Read more

Sample Preparation: General description Over a last decade there has been increased interest in nanochemistry. In order to explore novel physical properties and phenomena and realize potential applications of nanostructures and nanomaterials, the ability to fabricate and process nanomaterials and nanostructures is the first corner stone in nanotechnology. Variety of nanoparticles have been synthesized and … Read more