Entamoeba histolytica

E. olytica is a pathogenic amoeba. There are trophozoit cyst stages in its life cycle. Only the mature cyst (with 4 nucl infective. Men get infection by mouth. The amoebae inhabit the colon. They multiply by binary fission. The cysts passout with The life cycle of E. histolytica is cyst–trophozoite–cyst. The trophozoites may invade the intestinal wall or even liver and lung tissues by blood dissemination and induce pathological changes. I. Morphology. There are 4 distinct stages in its life cycle; trophozoite, precyst, cyst, and metacyst, but only the morphology of trophozoite and cyst possess morphologic characteristics that have diagnostic value. A. ophoite – active form. a. ize trophozoites vary in size from -60 micrometers in diameterb. Movement is by means of a pseudopodium, which is a cytoplasmic protrusion. The characteristics of pseudopodia of Entamoeba histolytica are: (1) broad or finger-like in form (2) thrust out quickly (3) pseudopodium first formed with hyaline ectoplasm, then the granular endoplasm flows slowly into pseudopodium when amoeba move (so called amoeba movement). 4) motility is progressive and directional c. Red blood cells may be found in the endoplasm. d. Nucleus, vesicular type: The nucleus is not visible in anunstained specimen, but when stained with hematoxylin, the nuclear structure will be clear. (1) Nuclear membrane is a delicate but distinct line. (2) Peripheral chromatin granules are fine and uniformally arranged on the inner surface of the nuclear membrane. (3) Karyosome is small and centrally located. The characteristics of the nucleus of E. istolytica are useful in differentiation of the pathogenic amoeba from the other non-pathogenic species. B. Cyst-Non-Motile (has no movement) Before encysting, trophozoites round up, cease ingesting food, and secrete a cyst wall, thus becoming a precyst, and then an immature and mature cyst. a. Immature cyst – spherical in shape, 10-20 Nm in size, and consists of 1-2 nucleus or nuclei. b. Mature cysts: 4 nucle. The characteristics of the cyst nucleus are similar to that of the trophozoite. Besides nuclei, there are two other inclusions: the glycogen vacuole and the chromatoid bodies (bars). Both the glycogen and chromatoid bars become smaller and smaller as the cyst ages, so sometimes they cannot be seen in the mature cysts. The glycogen acts as a food reservoir,but the function of the chromatoid bar is not known. When the cyst is stained with iodine, the glycogen appears brown or dark yellow brown in color, but the chromatoid bar can not be stained and has a refractory appearance. In iron-hematoxylin stained specimens, the chromatoid bar is rod shaped with two rounded ends and dark blue in color. he glycogen vacuole has been dissolved during the process of staining, so it appears as a clear space. II. Life cycle The normal life cycle of E. hystilytica is cyst-trophozoit-cyst III. Diagnosis (1) trophozoite (living): fecal examination (direct smear with normal saline) for the diagnosis of amoebic dysentery. One must pay attention to: a. The container must be clean and free of acid or alkaline. b. Trophozoites should be examined soon after they have been passed c. Keep specimen warm in order to keep the trophozoite's activity. d. Select the bloody and mucous portion for examination. e. If Charcot-leyden crystals are present, the stool must be carefully examinedfor the trophozoites of Entamoeba histolytica ( charcot-leyden crystals may be derived from eosinophiles). (2) Cyst: fecal examination (direct smear with iodine stain) for the chronic intestinal amoebiasis or carriers. Immature and mature cysts of E. histolytica may be found in the formed stool.

In What Ways Did Religion and Economics Influence the Development of Medieval Europe and Japan?

God’s laws told them that they were equal to the King. The archbishops, bishops, abbots, earls were freeman that could not be taken or imprisoned, outlawed or exiled or ruined unless by lawful judgments. General of injustice’s would cause the souls of them and the souls of their ancestors and successors to burn in all eternity. 2) How did the Magna Carta limit the power of King John? According to the Magna Carta: the king could no longer collect taxes from the English people unless the Great Council agreedany free man who was brought to trial for a crime had the right to be judged by his equals, rather than the king or his officials; this is what we know as a jurylegal decisions were also now influenced by the judges’ interpretation of previous court decisions; this made rulings more consistent so that the same crime couldn’t be punished in two different waysthe king himself now had to obey the laws of England; this was a brand new idea: that even the king was not above obeying the law3) How did the Magna Carta lay the foundation for democracy? Many of the ideas first written in the Magna Carta would later form the basis of modern democracy. It was the first document to limit the powers of the monarchy. This would influence the democratic idea of a system of checks and balances to keep one pie ce of the government (such as the president) from having too much power. It also established rights for everyday people and influenced the content of other documents that protect the rights of citizens, such as the Bill of Rights in the United States Constitution Another result of the Magna Carta was the establishment of the first English parliament. It created the Great Council, a group of 25 barons that the king was supposed to consult when he made a decision. This planted the seeds of a parliamentary government where the power was shared between the ruling monarch and the people, and the people had a voice. Later, Philip IV of France would use a similar idea in 1302 to establish the Estates-General. This was an assembly of noblemen, clergy, and townspeople that was also useful in uniting France under one national identity.

The benifits of nuclear medicine vs other forms of radiation exams Term Paper

The benifits of nuclear medicine vs other forms of radiation exams - Term Paper Example Today the stream of medical technologies has evolved to such an extent that almost all the medical specialists in medicine depend significantly on technology. In the following section this paper briefly describes the imaging modality called Nuclear Medicine. Although the imaging modalities like Nuclear Medicine, X-Rays, Computed Tomography, Magnetic Resonance Imaging, are categorized as modalities of medical imaging. Except for Nuclear Medicine which is also termed as Radionuclide Scanning, rest all belong to the field of radiology. The latter half of the paper presents a contrast between Nuclear Medicine and other above mentioned modalities of radiology. Nuclear Medicine: It is an old modality of medical imaging that was discovered accidently in middle of the twentieth century. Nuclear medicine is the conglomerate of physics, chemistry, mathematics, medicine, detectors and computer technology. It uses predetermined amounts of radioactive material to diagnose ailments pertaining to c ancer, heart etc. This noninvasive branch of medicine uses imaging modalities after a radioactive material also known as radiotracers is either injected into the subject through intravenous injection or the subject is made to swallow or it is inhaled by the subject. The radiotracer gets settled in the part of the body that is to be imaged or studied. These radioactive substances emit gamma rays – that is electromagnetic radiations consist of photons. These rays are detected by a gamma camera etc. These devices enable the specialist to understand the condition of the body part, on the basis on the level of radiation that is detected by the detector. Some of the imaging techniques used in nuclear medicine are Positron Emission Tomography (PET Scanner), Single Photon Emission Computed Tomography (SPECT), Bone Scanning and Cardiovascular imaging. Figure 1 shows a PET Scanner. Nuclear medicine is helpful in detecting cancers, inadequate flow of blood to various tissues in the body , improper functioning of organs. Figure 1. PET Scanner (Zwanger-Pesiri Radiology) Radiological Modalities: It is said that the invention of X-Rays by Roentgen in 1895 sparked off a trend of innovation in medicine. Clinical applications of X-Rays lead to the birth of radiology – one of the branches of medicine that has a significant role in other specialties like orthopedics and neurology. Computed Tomography (CT) scanning is an extension of use of X-Rays in medicine. Magnetic Resonance Imaging (MR) is another very important imaging modality that uses magnetic field and it was invented almost the same time as CT. Sideways radiology also saw the developments and use of ultrasounds in medicine. Nuclear Medicine vs. X-Rays, CT & MRI: Utility: Besides the anatomical (structural) information nuclear medicine (also called radionuclide scanning) also presents to the doctors the function of the body’s organ as well. This information enables the doctors to understand if the org an is functioning properly. In the case of other radiological modalities like X-Ray, CT etc, the information captured by them is purely anatomical. It is worth including here that the nuclear medicine images give lesser information about spatial resolution but the images obtained in nuclear medicine may help us to diagnose an ailment sooner than any other radiological

Peer Review Essay Example | Topics and Well Written Essays - 500 words - 7

Peer Review - Essay Example The writer also provides a lot of quotes from the writings of both the feminist writers to support the arguments. The paragraphs are organized in a coherent manner with each paragraph building on the previous one. However, it lacks a conclusion and there are few grammatical and punctuation errors e. g. the writer writes â€Å"oppression† instead of â€Å"oppression†. This writer provides a catching introduction by directly addressing the two writers, Anzaldua and Kingston. It is important to highlight the creativity when the writer notes that the two women share more than just their XX chromosomes. After the introduction paragraph, the writer provides a background of how the writers encountered sexist oppression. In the next paragraph, the writer adequately describes how the two writers use their languages as the strongest weapons against sexist oppression and patriarchy. This writer also provides relevant quotes that support these arguments. In conclusion, the writer describes examples of use of language as both shields and methods of attack. The essay is well organized, with each paragraph complementing the other. Though there are extremely few punctuation errors, the writer uses a few paragraphs. These errors can be fixed by proofreading through the essay again, while the paragraphs can be divided up to cover different points that are in a si ngle paragraph. This writer does not adequately capture the needs of the question. While the question demands that the writer develop a detailed argument that compares how Anzaldua and Kingston use language as a weapon against patriarchy with detail, this writer only provides summaries of the two writings. The writer just details the events that took place in the book including instances of sexist oppression and patriarchy. However, the writer fails to derive the differences and similarities of how the two writers tackle these issues. At the

Possibility article Essay Example | Topics and Well Written Essays - 250 words

Possibility article - Essay Example The Corp vigorously attempts to contain the outbreak of the T-virus. The T-virus is â€Å"the only known Umbrella-made virus that possesses the ability to infect almost all known animal and plant species. The extreme degeneration of intelligence is also dependant on species, as Eliminators are known to possess much more intelligence than zombies and are capable of understanding orders.  In humans, t-virus infection is only 90% effective, with the remaining 10% of the population having a natural immunity to the virus, even when directly bitten by a Zombie. As well as this, the rate of the infection is unique to each person, and can be influenced by several factors which may speed up or slow down infection† (Project Umbrella, n.d.). Does the T-virus have possibilities of existence? The film shows that people can turn into parasite victims that are mindless and zombie-like slaves. Thus, there is what you call Toxoplasmosa Gondii parasite that seems to give the same effect that can lead to such terrifying holocaust. â€Å"Human and rat brains share the same basic anatomy and neurotransmitterrs, which is why rats are common in human drug expirements.

GPS Term Paper Example | Topics and Well Written Essays - 1500 words

GPS - Term Paper Example The technology is owned by the United States that offers users through navigation, positioning as well as timing services. This system is composed of three segments that are control segment, the space segment and the user segment. The United Sates Air Force maintains, develops as well as operates the space and control segments (Bajaj, Ranaweera, & Agrawal, 2002). This paper presents a detailed overview of global positioning system. This paper will outline the history, advantages and disadvantages of the global positioning system. Initially GPS system was designated the navigation system with timing and ranging (or NAVSTAR) global positioning system. Additionally, US Department of defense initiated this project to offer round-the-clock and all-weather navigation abilities intended for sea, military ground as well as air forces. In addition, with the development of global positioning system it has become an integral asset in several civilian applications as well as industries around the world, comprising recreational utilization (for example aircraft, boating, hiking), business vehicle fleet tracking, as well as surveying. However, the general development of global positioning system was initiated by LORAN and the Decca Navigator developed ultimately in 1940s, as well as employed throughout World War II. Additionally, to attain precision requirements, GPS employs rules and regulations of general relativity to make right the satellites atomic clocks. In addition, by seeing these parallel developments in the GPS technology, in 1960s it was recognized that a superior system could be developed by producing the most excellent technologies from 621B, Timation, Transit and SECOR in a multi-service program. Thus, a meeting of approximately 12 military officers held at the Pentagon in 1973. In which they decided to create a DNSS (defense navigation satellite system). Thus, after one year of that meeting the DNSS

Ethical Systems Essay Example | Topics and Well Written Essays - 500 words

Ethical Systems - Essay Example In the movie Sophie’s Choice, Sophie has to make a painful decision wherein she has to choose one of her two children to be sent to the gas chambers in order to save the other. The other option is to let go both the children with the guard to a certain death. Ethical formalism as brought out by Kant (Jensen, 1934), states that ‘Act only on that maxim through which you can at the same time will that it should become a universal law.’ In other words, an action irrespective of other circumstances and environment, is either right or wrong and can be applied universally at all points of time. Going by ethical formalism, in choosing for one of her children over the other, it is felt that Sophie has exercised her feelings and emotions rather than the universal law. The right choice for Sophie would have been to fight for the lives of both children even if it finally lead to the death of both the children. By deciding to send the girl away, she has wrecked havoc in the mi nds of both her children and herself. That she commits suicide at the end of it brings out this emotional struggle that she goes through. However, viewing Sophie’s Choice from an utilitarian perspective (Harpham, 1999), choosing rather than not choosing was the right thing to do. By choosing, irrespective of which child, she has potentially saved the life of at least one child. If she refused to choose and opted to struggle to keep both her children with her, the guard would have taken both of them away, presumably to the gas chambers. Therefore, from the utilitarian point of view, the lesser harm was in choosing one child over the other and Sophie did the right thing by doing so. The bombing of Hiroshima and Nagasaki resulted in the deaths of more than 100,000 civilians and an even greater number of casualties, cannot be easily justified regardless of the attack’s outcome (Alperovitch, 1995). As a result, controversy surrounds the use of atomic bombs against the Japanese cities of