Essays on O2

Summary

At high altitude human face a unique stress of hypobaric hypoxia due to reduced fall in barometric pressure and the extent of oxygen molecules, therefore, studying humans at high altitude facilitates the understanding of adaptation capabilities of human against evolution as well as environment. The following essay summarizes an article authored by Beall that studied the arterial-oxygen-content phenotypes of three high-altitude inhabitant populations residing on Tibetan, Andean, and Ethiopian plateaus. The article is based on the problem that how people possess diverse adaptation potential on different heights where the oxygen level is very low in comparison of normal sea ...

Introduction

Coal is a very cheap and abundant provision of energ. In fact, it is the most abundant fuel in the United States; U.S. has the highest coal reserve in the world, with up to 25% of the known world coal present in America and being mined in 26 out of the U.S. 50 states (fe.doe.gov, 2013). However, this abundant energy is seldom used because it is a very dirty energy. According to Hong & Slatick (1994), up to 204.3 pounds of carbon dioxide per million Btu is emitted when coal having 78% carbon content is completely burned to attain a ...

The single-celled parasite, Plasmodium falciparum, causes malaria, was responsible for 214 million cases and 438,000 deaths globally in 2015, of which 88% of cases and 90% of deaths occurred in sub-Saharan Africa. The morphology of P. falciparum is characterized by numerous rings (young trophozoites) and the absence of mature trophozoites and schizonts. In a P. falciparum blood smear, multiple infected erythrocytes appear more often than in other species and the rings of the parasite in the blood smear tend to be smaller than other species. Distinctive crescent-shaped gametocytes appear late in the infection. In vitro cultivation of P. ...

If a fuel mixture can be represented by the general formula CxH2x, prove that the stoichiometric gravimetric air/fuel ratio is 14.8:1.

The combustion reaction for a given fuel mixture will look as follows:

CxH2x + 1.5x(O2 + 3.76N2) → xCO2 + xH2O + 1.5x*3.76N2 The molar ratio is 1.5x:1, to find the gravimetric ratio, the masses of the air and fuel should be found. This can be done by multiplying molar ratio with molar weights of the fuel and air. m(fuel) = 12*x + 2x*1 = 14x m(air) = 1.5x(16*2 + 3.76*14*2) = 1.5x*137.28 = 205.92x The gravimetric stoichiometric air/fuel ratio then is 205.92x:14x = 14.71:1 The dry exhaust gas analysis from an ...

Root cause analysis

The healthcare system recognizes its first priority as the safety of the patient and the ability to afford the patient groups quality care. The Joint Commission on Accreditation of Healthcare Organizations (JCAHO) has an obligation to ensure that healthcare facilities live to this expectation and one of the methods that have been employed over time to oversee the sustenance of quality and safe care is the requirement that all healthcare facilities regularly conduct root cause analysis of their facility (Chen, Schein & Miller, 2015). The RCA process is based on the need to determine any existing misses and errors that ...

Executive Summary . 3-4

History .. 4-5

Strategic Elements 5-6

Critical Events .. 6-7

Leadership 7-8

Mission and Vision Statement . 8-9 External Assessment 9-13 Analysis of Competitive Position 13 Internal Assessment . 13-17 Current Strategy 18 SWOT Analysis 18-21 BCG Matrix . 21-23 IE Matrix .. 24-25

Possible Strategic Alternatives 25-26

Evaluation of Current Organizational Structure .. 25 Recommendation Changes .. 25-26

Situational Analysis . 26-29

New Turnaround Objective .. 29

Proposed Measures . 29-31

Funding this Turnaround Effort 32-33 Financial Projections 33-34 Conclusion 34

References 35-36

Sears Holdings Corporation Executive Summary Sears Holdings is a major brick-and-mortar retailer in both the United States and Canada. As such, it sells a wide variety of products, including appliances, consumer electronics, apparel, tools, sporting equipment and ...

Introduction

This paper aims at evaluating concepts of alteration in homeostatic state, secondary to temporal variables. It analyses the case study of Brad, a 45-year old coal cutter who has held the job for 25 years. Brad is experiencing a chronic cough due to prolonged exposure to coal. Importantly, he has not been attending yearly checkups because he fears that his lung is “black.” The disease leads to fibrosis, reduced diffusing ability, and dilation of the small airways. In the final stage, the airways, alveoli, and pulmonary capillaries become damaged.

How the disease described in the case study creates incongruous between ventilation and perfusion

Chronic lung disease may induce mismatch in ventilation and perfusion ...

Introduction

Much recent publicity surrounding climate change has focused mostly on global warming, but little direct correlation has been given in the media with regard to the impacts that environmental pollution has on climate change, and also on human health. Although studies of pollution and the environment have been carried out since the time of the Industrial Revolution, it only relatively recently that attempts to measure environmental on a global scale have been undertaken. Environmental pollution is a major cause of global concern, not only for the effects that it has on the physical environments, but also for its potential ...

1.0 Internal Assessment [from Phase 1] The SWOT Analysis, using the Internal Factors Evaluation (IFE), noted Sear’s strengths in the areas of retail network (expansive), strong brand recognition (e.g. Kenmore Home Appliances, Craftsman Tools, etc.), and a strong management team (lots of untapped potential), among others. Conversely, its weakness were also notable: deteriorating debt margin (has exceeded its assets and capital), unreliable revenues (fluctuating), and poor management style (cause of poor strategies), among others. 2.0 Current strategy Supplier and merchandise inventory management: Despite the fact that the fourth quarter only generates not more than 29 percent of its ...

Patient and Study Identification

The patient is a 10-year-old boy sent by the referring specialist neurologist, whom the patient visited after his mother had found him experiencing seizure twice during the past month. The patient was first diagnosed with absence epilepsy when he was 5 years of age, and has not experienced seizures since he was 8 years of age. The purpose of this electroencephalography (EEG) study is to identify the type of epilepsy in this case so that the patient can receive the correct treatment.

History

The patient had a normal birth and experienced healthy development until the age of 5, when his ...

Mechanical ventilation (MV) causes oxidative stress that is responsible for adverse consequences on organs. In a situation of MV, the excessive pressure impairs the function of the mitochondrial respiratory chain leading to oxidative and nitrosative stress (Kavazis, 2009; Hafner et al., 2014). MV is commonly associated with hyperoxia where an excess of oxygen is provided. In such a case an oxidative stress can be induced when the oxygen pressure in the alveolar exceeds that of the normal breathing conditions because the biological system is not able to readily detoxify the environment from components such as reactive oxygen species (ROS) ( ...

Microbial fuel cells are devices that employ bacterial or other microbial cells to generate electricity (Singh, Pratap, Baranwal, Kumar and Chaudhary, 2010). Cells generally carry out electron transfer and oxidation-reduction reactions during normal metabolic activities. Electrons generated during these reactions can be made to flow through an external circuit to generate current. Fig 1. Depicts a typical MFC. The anodic compartment consists of microbial culture in glucose or other medium (Singh et al, 2010). Wastewater can also be used as a substrate source for microbes in a MFC intended for effluent treatment application. The microbial cells breakdown complex substrates ...

Introduction

Cellular respiration and photosynthesis are vital reactions in living organisms since without the two; there would be no life on earth. Cellular respiration involves a set of metabolic reactions that take place in cells of living organisms thereby converting nutrients like sugar into adenosine triphosphate (ATP) (Osterhoudt & Barhydt, 2010). On the other hand, photosynthesis involves the conversion of carbon dioxide into organic compounds by the photoautotroph in the presence of sunlight. Most animals attain their energy requirements through cellular respiration while on the other hand; photosynthesis is performed by most plants that can make their food. These two reactions ...

Introduction

There are environmental chemical processes which require light to react. These processes are called photochemical reactions. Photochemical reaction is commonly initiated due to the absorption of solar energy or light. When molecules absorb energy in the form of light, the atoms are converted in a transient excited state (Larson & Weber, 1994). This transition state or excited has completely different physical and chemical properties with the initial state of the molecule. The excited states also have more tendencies to react since they are considered stronger acids and stronger reductants that the initial state of the molecule. The excited state of ...

Introduction

Stainless steel is an alloy with iron as major part and chromium with at least 11% by weight . Stainless steel industry grew rapidly during the 1989-93 period . This paper analyzes stress corrosion of stainless steel along with prevention measures and selection methods for stainless steel. After carrying out the study, it would be established whether stainless steel is an effective alloy or not for major uses in steel industry through adopting various selection parameters. Stainless steel is called stainless due to the resistance to rusting and corrosion .

Stress-corrosion in Stainless Steel

In order to reduce various occurrences of intergranular stress-corrosion cracking and severe ...

Introduction:

The bacterial negative gram bacilli group Enterobacterriaceae have both motile and non-mitole relationships with peritrichouse flagella. Both types of bacteria, however, have the ability to fermet glucose and get nitrite from nitrates, as well as produce gas. They are a common find in greenhouses, and there are hundreds of species of this microorganism, including Proteus, Escherichia coli, Klebsiella, Salmonella Enterobacter, pneomoniae, etc. The pathogenic types of this bacteria have the ability to bring about diseases in animals and humans.

In this test, two varying types of Enterobacteriaceae will be identified (Klebsiella pneumonia and Escherichia coli. This will be accomplished ...