Abstract This paper looks into the chemical make-up manufacturing processes of fragrances. It begins by discussing the history of fragrances and their uses. It specifically discusses the discovery and development of fragrances. The paper also looks briefly at the shortcomings of fragrances that may pose health risks and other problems.
Table of Contents:
Introduction
Chemistry
Manufacturing Process
Insights
Summary-Conclusions
Appendix
From the Paper "Many substantive (long-lasting) odorants are known, but a great number of them are too volatile to be perceived more than a few hours after their application. This is the reason why more efficient and effective fragrance-delivery systems, especially for laundry-care products, are intensely sought. The use of "prodrugs", an inactive drug derivative that is converted in the body into its active form, is a well-established technology to improve the oral bioavailability or the penetration across biological membranes. This led to the development of a wide range of precursors that are cleaved by hydrolysis during the laundry process to generate in situ fragrance materials, for example, aldehydes and ketones derived from oxazolidines and ionones and damascones from sz-amino compounds have been developed by Procter & Gamble Fragrance chemists are still looking for new systems with improved stability and release properties."
Abstract The writer notes that the objective of the laboratory describe in the paper is to observe mobile cells and their characteristics. Three distinct samples are viewed: plant cells from an Elodea leaf, a eukaryotic animal cell called Tetrahymena pyriformis, and myofibrils from a rabbit muscle. The writer points out that when movement is detected in the plant and animal cells, it can lead to calculations of speed. Both intracellular and inter-cellular movement is exemplified in the samples. The writer notes that cells are not only observed under natural conditions, but also after biochemical alterations. The effects of these biochemical changes are also noted. The addition of methyl cellulose enables more accurate observation of the animal cells, since it reduces their speed. The writer concludes that when the ATP was added, the decrease in size proved that the myofibrils are responsible for the muscular function and that the muscle is dependant on the myofibrils successfully working together. However, each cluster of myofibrils appeared to be structurally independent, meaning it was not connected to any other cluster.
Outline:
Introduction
Materials and Methods
Discussion
References
From the Paper "The Tetrahymena cells were all similar in size, and were either circular or elliptical in shape. Their nuclei and cytoplasms were clearly seen, but any other organelles were difficult to distinguish. Whether they moved horizontally, vertically or diagonally, linear motion was consistent in all the cells. It also seemed like they each one followed a unique path across the field of view. After adding methyl cellulose to these cells, their movement became significantly slower, and deceleration continued until the cells stopped moving altogether. However, their movement also became random, sporadic and generally unpredictable, since they did not seem to be following any particular path. As well, some cells began moving in a circular motion, as if around an axis, and many cells began to gather in large groups once they stopped moving."
Abstract The writer explains that in the set of experiments discussed in the paper, myosin and actomyosin were isolated and gradually purified from rabbit muscle myofibrils. The two proteins were initially precipitated together out of solution, in order to remove any impurities. Then, the two proteins could be separated from each other, by taking advantage of differential solubility. The writer notes that after each time they were re-suspended or redissolved, the solutions were centrifuged in order to further improve purity. Any solution containing the contractile proteins or ATP were kept on ice during the experiments, and stored in a freezer at all other times. The writer discusses that using the Bradford protein assay and the SDS-PAGE, the concentrations and weights of the purified proteins in the final solutions were measured. For all protein samples, no appreciable concentration of protein could be detected after diluting the samples by 100 times. However, the other two dilutions yielded normal results.
Outline:
Abstract
Introduction
Materials and Methods
Results
Discussion
From the Paper "The head of the myosin is the part which interacts with the other molecules. Without ATP, the myosin head is bound tightly to the actin, called the rigor state. However, ATP weakens this interaction by opening a cleft in the myosin head and disrupting the actin-binding site. When the myosin head is free of actin, it hydrolyzes ATP to ADP. This causes a conformational change in the head that moves it to a new position, closer to the (+) end of the actin filament, (away from the origin site) where it reattaches. The dissociation of the phosphate from ATP also causes a conformational change, this time in the myosin head. As a result, myosin returns to its original state (the rigor state). Because myosin is still bound to actin, this conformational change exerts a force that causes myosin to move the actin filament. This is the power stroke. Essentially, contraction is a series of these power strokes by the actomyosin complex, the myosin head is moving along the actin filament through constant detachment and reattachment."
Abstract Ginseng has been used for medicinal proposes for thousands of years. It seems to improve health, and boost individuals' immune systems. This paper describes an experiment to scientifically determine that ginseng is indeed beneficial for the immune system. The paper relates that, by exposing macrophage U937 cells to varying concentrations of ginseng alongside ethanol, it was determined that the cells in presence of ginseng show an increase in cell concentrations, and in nitric oxide production.
Outline
Introduction
Materials and Method
Results
Discussion
From the Paper "It is well known that most of the medicines in the world are derived from plants. For many years plants have been investigated in an effort to help boost the human immune system, and accelerate the recovery process from infectious diseases. Panax ginseng is a notable traditional herbal medicine that has been utilized by the Chinese for thousands of years [1]. Although there have not been extensive studies of ginseng's benefits to the immune system [3], the plant's capacity on the function of leukocytes has been under study [3]. The use of ginseng as a medicine has been gaining popularity in the west [4], much of this is because of studies that have linked it to prevention of cancer [5]. It is believe that much of the beneficiary components of ginseng are because of ginsenosides, a various group of steroidal saponins, which are able to target and affect a large number of tissues [4]."
Abstract This paper describes an experiment, which stimulates the hearts of Daphnia by using caffeine, nicotine, epinephrine, ethyl, a diluted salt solution and various pH 10 solutions. The author reports measuring the heart rates of the Daphnia and discusses the changes in heart rate for each of the stimuli.
Table of Contents:
Materials and Methods
Result Analysis
Discussion
Graphs
From the Paper "Giving Nicotine to the second Daphnia, caused a drop in its heart rate (graph 2). Since nicotine is a widely used drug which is a depressant, it lowers the beating of the Daphnia heart. The Daphnia that acquired epinephrine, experienced a jump in heart rate (graph 3). Epinephrine, otherwise know as adrenaline, is secreted by the adrenal medulla in response to stress. It stimulates autonomic nerve action, which is why a rise is heart rate was observed."
Tags: control adrenaline survival, acid polluted, microscope
Abstract This paper explains that disorders of homeostasis, fluid, and electrolyte balance occur in every setting, with every disorder, and with a variety of changes that affect healthy people. The paper also describes body fluids and electrolytes and the process of regulation of body fluid through osmosis. In addition, the paper discusses issues of homeostasis in the kidneys, skin, lungs, and the gastrointestinal tract.
Table of Contents:
Introduction
Body Fluids
Electrolytes
Regulation of Body Fluid Through Osmosis
Diffusion
Diffusion
Filtration
Sodium-Potassium Pump
Electrolyte Balance
Kidneys
Skin
Lungs
Gastrointestinal Tract
Laboratory Tests for Evaluating Fluid Status:
Osmolality
Osmolarity
Homeostatic Mechanisms
Kidney Functions
Heart and Blood Vessel Functions
Lung Functions
Pituitary Functions
Adrenal Functions
Parathyroid Functions
Baroreceptors
Renin-Angiotensin-Aldosterone System
Antidiuretic Hormone and Thirst
Osmoreceptors
From the Paper "The hypothalamus manufactures ADH, which is stored in the posterior pituitary gland and released as needed. ADH is sometimes called the water-conserving hormone because it causes the body to retain water. Functions of ADH include maintaining the osmotic pressure of the cells by controlling the retention or excretion of water by the kidneys and by regulating blood volume.
Abstract This paper explains that the search for life beyond this planet must be built on a solid understanding of how life managed to emerge on Earth. The author examines the development of extraterrestrial theories about the origins of life by beginning with an examination of previous theories of origin. The paper then presents current research and the empirical basis for current theories with implications for the search for extraterrestrial life. The author also offers some possible avenues of future research and examination, which could help refine the understanding of the origins of life in the universe.
From the Paper "In fact, the presence of a liquid like water seems to be the only major prerequisite for the development of life. Without a liquid, the complex chemical reactions required for the emergence of life are presumed impossible. But, that's not to say that the liquid in question must be water. Many researchers are exploring the possibility of life developing in more unorthodox liquids, such as methane, ammonia, or even sulfuric acid. Life on earth may have simply developed to take advantage of the very abundant liquid water; water's presence may have only been happenstance."
Abstract This paper explains that antidepressants are a group of psychoactive medications that alleviate the signs and symptoms of mood disorders with a pre-dominantly depressive mood. The paper then explains that an understanding of the major mechanisms of action of these drugs can be best accomplished through understanding the pathogenesis of mood disorders. The paper then relates that, by understanding the mechanism of SSRI (e.g. venflaxine), it is possible theoretically to infer the neurobiological component of the pathogenesis of increased suicidality in depressed adolescents.
From the Paper "The psychopharmacologic effectiveness of anti-depressants center around one of three mechanisms of action: increasing serotonin and norepinephrine levels through blocking of presynaptic 5-HT and norepinephrine receptors (i.e. interruption of negative feedback for neurotransmitter regulation), blocking of serotonin or norepinephrine reuptake by the presynaptic neuron or inhibition of MAO to interrupt deactivation of these neurotransmitters (Bhalla & Aronson). Selective serotonin reuptake inhibitors (SSRIs) will be discussed in further detail."
Abstract The paper describes nanotechnology and the growth of this field. The paper discusses how, although nanotechnology promises to revolutionize many products and medications in the future, many believe it needs to be researched more completely before releasing it to the public for consumption.
Outline:
Introduction
What it is
Conclusion
From the Paper "For many start up companies across the nation the word nanotechnology strikes a chord. While it is still a small market as compared to many other open markets in today's business world it is a new enough market that it holds promise for the future of start up company success(Challener, 2003).
"The most significant contribution that nanotechnology will make to the business world is the fact that it is very flexible by design and its use. It can be used in many areas of business including automotive technology, aerospace technology, drug delivery and the textile industry."
Abstract In this article, the writer notes that heroin use is a problem plaguing countries all over the world. One of the most common and successful ways to combat heroin use is with pharmacological measures. The writer points out that naloxone, a narcotic antagonist, is used to reverse the effects of a heroin overdose. In 2002 it was approved in a combination tablet with buprenorphine for the treatment of heroin addiction. The writer discusses that the approval of the combination buprenorphine/naloxone tablet means that more nurses working in an outpatient setting will be administering naloxone to patients seeking help for heroin and opiate abuse. The writer them emphasizes the importance of explaining the indications and possible side effects of any drugs administered to patients, and to know the proper procedures to take should a patient misuse the medication. The writer concludes that hopefully, as the medical community becomes more aware of the problems associated with drug use and dependence, we will be able to come up with better solutions to solving the problem.
From the Paper "In a study done by Cantwell et al., paramedics assessed patients for respiratory status, concurrent drug intoxication, and evaluated the patient according to the Glasgow Coma Scale. Overdose victims were more likely to receive less than the standard dose of naloxone with each single increase in number of breaths. With an increasing Glasgow Coma Scale score, patients were more likely to receive less than the standard dose of naloxone. Patients with concurrent alcohol intoxication were more likely to receive greater than the standard dose of naloxone. It is thought that alcohol combined with heroin causes greater CNS depression than that produced by heroin alone. The trend towards older patients, and male patients receiving higher doses was also seen. The study suggests that patients with a higher level of consciousness and respiratory rate require a smaller dose of naloxone to return to a normal state than those patients with a lower respiratory rate and decreased level of consciousness."
Abstract This paper explains that biomaterials are synthetic materials used to replace or restore damaged function. They should be biocompatible, non-toxic and non-carcinogenic. The paper reports that metals, polymers, ceramics and composites are the most commonly used biomaterials. The paper then details their use as synthetic orthopedic, dental and breast implants, in hernia repair, in gene therapy, to replace damaged organs, to enhance bone healing, to store and dispense multiple drug doses and multi-stage vaccines and other uses.
Table of Contents:
Biomaterials in Medical Use
Polymers
Shaped Bodies
The Ideal Materials
ATP Research Fund
PolyHap Implants for Damaged Faces
Polymer Chip
Anti-bacterial Implants
Breast Implants
Polyurethane-covered Implants
Benefits and Contraindications
Benefits
Contraindications
Implants for Malignant Gliomas
BCNU/Gliadel
Polymer Technology
Periodontium Regenerating System
The Invention's Specifics
The Future is Biodegradable
Hernia Device
Summary
From the Paper "Periodontal disease affects up to 90% of the population and surgery has been the first choice of therapy. Surgery, however, does not restore lost periodontium. Restoration can happen if periodontal ligament cells can colonize root surfaces over gingival epithelial cells, gingival fibroblasts or osteoblasts. The application of microporous membranes under periodontal flaps during surgery eventually brought this effect about. A biodegradable membrane would make a follow-up surgery unnecessary and benefit both patient and surgeon from further health condition and cost."
Abstract This paper explains that streptococcus mutans are the main bacteria that cause dental cavities, which can advance to the gums to form periodontal disease. The paper also explains that dental cavities are caused by streptococcus mutans and lactic acid bacteria, which perform malolactic fermentation on tooth. The paper concludes that, though various drugs are available for this illness, it is better to take precaution to stop the colonization of these bacteria through proper care of the mouth and early diagnose of dental disease.
Table of Contents:
Introduction
Information on Streptococcus Mutans
Name
Classification of Streptococcus Mutans
Structure of Streptococcus Mutans
How to identify Streptococcus Mutans
Details of the Disease
Historical Significance
Historical significance of Dental Cavities
Historical Significance of Periodontal Disease
Causes
Causes of Dental Cavities
Causes of Periodontal Disease
Symptoms
Symptoms of Dental Cavities
Symptoms of Periodontal Disease
Treatment
Treatment of Dental Cavities
Treatment of Periodontal Disease
Streptococcus Mutans and its Connection to Dental Cavities and Periodontal Disease
Where Research in the Field may be Going
Emergence of Resistant Strains to the Disease of Dental Cavities and Periodontal Disease
Development of new Drugs for treating Dental Cavities and Periodontal Disease
Conclusion
From the Paper "The shape of a bacterium is used to determine its name. Since Streptococcus mutans is of a spherical shape, the bacteria were named as coccus. The major genera of Streptococci were named as Streptococcus and Staphylococcus. Another name associated with Streptococci is diplococcoi though a change by a gram negative in its feature would put them in a completely different genus like Neisseria or Branhamella. Streptococci are also found in other forms though the major shapes are in the form of a small comma known as Vibrios and a spiral shape known as Treponema."
Abstract The paper relates that silica is an extremely important component in many industries, including the construction, pharmaceutical, cosmetic chemical and computer industries. The paper explains its special qualities, notably that it withstands sudden changes in temperature. The paper discusses how the inhalation of fine silica dust in large enough quantities can lead to the disease of silicosis and addresses the common safety measures. The paper also looks at the specific storage and transport requirements for inert silica.
Outline:
Introduction and Overview
Usage
Safety, Storage and Worker Protection
From the Paper "This substance was discovered in 1824 by the Swedish chemist Jons Jakob Berzelius. (SILICON or SILICA) It has an atomic number of fourteen and has various metallic characteristics. An important fact is that silica is never found in its natural state but as a silicate ion (SiO4), combined with oxygen. (SILICON or SILICA). It is found in silica-rich rocks such as obsidian, granite, diorite, and sandstone. Feldspar and quartz are the most significant silicate minerals. (SILICON or SILICA). Silica is also be found in "... skeletal parts of various protists and animals, such as certain sarcodines ...diatoms , and sponges , and in the stems and other tissue of higher plants" ( Silica)."
Abstract This paper explains the buffer systems in the human body. It specifically focuses on the role of the buffer systems in maintaining proper body pH. The paper explains the effect on the bodily systems if changes occur to shift the balance of acid-base systems to a range that is out of the norm. The paper looks at various cations and ions in the body and their function.
Table of Contents:
Changes in pH
Sodium
Potassium
Calcium
Chlorine
Hydrogen
Oxygen
From the Paper "Buffers and buffer reactions are one of the most important reactions in the human body. The body has a limited tolerance for changes in pH. The ability to maintain proper pH can present as a primary cause of concern, or it can represent a secondary complication. The most common problem associated with pH shifts are heart arrythmias and pulmonary problems. The six chemicals discussed in this research are the most important ones for maintenance of proper pH. However, there are many others that play a minor role. Understanding how the body maintains homeostasis is one of the most important concepts that any medical professional can know."
Abstract This paper explains that, in lakes that have suffered years of external loading, high levels of bound phosphorus are released from pools into the surrounding water column. Phosphorus in pools is bound in many forms including redox-sensitive iron compounds and loosely bound organic compounds. The paper describes the microbial action, chemical reactions and physical disturbance to the sediment layer, which contribute to the release of phosphorous into the water column. The paper also reviews several management techniques, such as removing heavily contaminated sediment from the lake floor and precipitation by the addition of iron or alum, which help speed the recovery process of the lake.
Table of Contents:
Abstract
Introduction
Phosphorus forms in Sediment
Phosphorus Release Mechanisms
Chemical Release Mechanisms
Physical Release Mechanisms
Biological Release Mechanisms
Management and Restoration Techniques
Source Reduction Strategies
Physical Reduction of Phosphorus Availability
Chemical Removal
Analysis and Summary of Findings
Analyzing the Unknowns
Conclusions/Recommendations
From the Paper "The first is the use of physical means such as dredging and flushing to remove sediments containing high concentrations of phosphorus. Another method is the use of agents such as Aluminum Sulfate or gypsum to bind phosphorus in the water system. Yet, other methods have focused on long term reduction of external loading as the ultimate solution to the problem. The success or failure of these methods depends on the source and fractionation profile of the lake.
It was once thought that reducing external loading of the lake would rapidly decrease phosphorus levels in lakes."
