Contrast and Compare Leonardo da Vinci's Last Supper with Gioto de Essay

Contrast and Compare Leonardo da Vinci's Last Supper with Gioto de Bondones The Mourning of Christ - Essay Example They presented the men and women in the solemn garb of the Roma forum. Both artists believe that God, His Divine Son, the Blessed Virgin and all the saints are men and women of the noblest physical and moral type. The Florence of Giotto's time was a little city with 100,000 inhabitants. The Florentine artist of his time is also a poet, a thinker, a sculptor and an architect aside from being a painter. The painters joined the guild of druggists who were their color makers. When a patron wanted a painting, he went to the painter's shop and ordered it, specifying the subject and the treatment that he wanted. A wealthy Florentine would naturally want to invest in a fresco. In comparison, the Florence of Leonardo's time was also very prosperous. Florence began the fifteenth century free from foreign domination and relieved from the dangers of Milan after the end of the war of 1402. The Platonic Academy was formed after the Council of Ferrara-Florence in 1439. The Medici family of merchants and bankers rises to power in Florence in the 15th century. Although no member of the family holds an official title until the sixteenth century, the Medicis' enormous wealth and influence grant them virtual rule of Florence. The family dominated the political, commercial, and cultural life of the city. It is under their patronage that Florence becomes a center of humanist learning and the seat of a tremendous flourishing of the arts. Although both artists engaged in fresco painting, their styles are very distinct from one another. For instance, with regard to its subject the theme, the "Last Supper" may be divided into two distinct movements: the institution of the Sacrament and the "Unus vestrum". Leonardo has chosen the moment at which Christ declares that there is a traitor in the company. He chose to highlight the effect of a speech on twelve persons on twelve different temperaments: a single ray and twelve reflections. The subject has been well analyzed by Goethe. It is clear that in a"seated" drama of which the subject is interior disquiet, surprise, anguish, it suffices to show the persons at half length; busts, face, and hands suffice to manifest the moral emotion; the table with its damask cloth by almost completely concealing the lower limbs offered the ingenious artist a resource which he knew how to use. Leonardo divided his actors into two groups, two on each side of Christ, and he linked these grou ps in order to project a certain continuity, animated by a single movement. The whole painting is like the successive undulations of a vast wave of emotions. The fatal word uttered by Christ who is seated at the middle of the table produces a tumult which symmetrically repels and agitates the two nearest groups and which lapses as it is communicated to the two groups farther removed. The intimate composition of each group is wonderful. The emotions of stupefaction, sorrow, indignation, denial, vengeance and the variety of expression which the painter has gathered together in this picture shows the depth of the analysis, the veracity of the types and physiognomies, the power and the accumulation of contrasts. Each head is the "monograph" of a human passion, a plate of moral anatomy. Giotto's method is completely different.

Who Is Jesus Essay Example for Free

Who Is Jesus Essay To say who Jesus Christ is within one essay would be an impossibility. However, as a servant of my Lord and Savior, I will attempt to explain who my precious Jesus is. Who is Jesus? He is the Son of God and He is also the Son of man. He is the atonement for our sins; he is the King of glory. Jesus is the bright and morning star and a mighty counselor and teacher. He is the great physician and the bread of life. Jesus is the bread of life; the first and the last; the Alpha and the Omega. He is the King of kings and the Lord of lords. To me, personally, Jesus is my strength and the best thing that has ever happened to me! He is my Savior; my Redeemer and my best friend. And what He is to me, He desires to be to the whole world. He is the good Sheppard; He gives life for the sheep. (John 10:11, King James Version) Jesus’ mission to the world is to seek and save that which is lost. The whole reason he left Heaven and came to this earth and was crucified was so that we could be saved by His blood. We know what his mission was by reading His holy word, the Bible. John 3:16 says: For God so loved the world that He gave His only begotten Son; that whosoever believeth on Him should not perish but have everlasting life. So, in conclusion, let me say that this Jesus that I am describing is the reason for living and without Him, life would not be worth anything. I love Him so much. But, most of all, He loves me.

Melkersson-Rosenthal Syndrome: A Case Study

Melkersson-Rosenthal Syndrome: A Case Study Dr. Shruti Bohra Dr Pratik B Kariya Dr Seema Bargale Abstract: Melkersson-Rosenthal syndrome (MRS) classically shows a triad of orofacial swelling, fissured tongue and facial palsy, more commonly the oligosymptomatic form. The orofacial swelling is characterized by fissured, reddish-brown, swollen, nonpruritic lips or firm edema of the face. The facial palsy is indistinguishable from Bells palsy. The least common feature is fissured tongue, although seen in one third to one half of patients but when present it assists in the diagnosis. The histologic finding of MRS includes noncaseating, sarcoidal granulomas, not invariably but their absence does not exclude the diagnosis. All these findings together provoke the careful search for provocative causes for the reactive symptom complex of the Melkersson-Rosenthal syndrome. Key words: Melkersson-Rosenthal syndrome. chelitis granulomatosa, facial palsy, fissured tongue. Introduction: Melkersson-Rosenthal syndrome is considered to be a rare syndrome. Hornstein- estimated the incidence to be 0.08%.1MRS is a non-caseating granulomatous disease showing (complete or incomplete form) a triad of facial paralysis, orofacial oedema and fissured tongue (scrotal tongue, lingua plicata, or furrowed tongue). Orofacial swelling is the most consistent and dominant feature of the Melkersson-Rosenthal syndrome. In a review of 200 patients diagnosed with Melkersson-Rosenthal syndrome, it was the most frequent initial presenting sign.2Most commonly the lips are affected, with the swelling sometimes confined only to the lips. Cheilitis granulomatosa (or granulomatous cheilitis) is achronic inflammatory granulomatous swelling of the lip, which is referred as Miescher cheilitis which is generally regarded as a monosymptomatic form of the Melkersson-Rosenthal syndrome.3 Melkersson-Rosenthal syndrome usually presents in a monosymptomatic or oligosymptomatic form. Around 200 cases are re ported in a review of Zimmer et al2, we hereby report an additional case. Case report: A 16 year old female patient reported to dental OPD with the chief complaint of generalized gingival enlargement as well as swelling in upper and lower lip since 8-9 months. Patient was apparently alright 9 months back when she had an episode of fever which lasted for 8 days and subsided with medication taken from a local clinician. It was followed by episodes of remission exacerbation of gingival enlargement with swelling of upper lip with pus discharge and bleeding to touch since 8-9 months. Then patient was referred to the department of oral pathology for needful. On examination face was bilaterally asymetrical with swelling of face on right side. Both upper and lower lips were swollen (markedly swollen upper lip) (Fig: 1). On palpation the swelling had normal temperature, was not painful, and was nonpitting and rubbery in consistency. Face was flattened on left side. Mandible was deviating on right side on opening of mouth. On intraoral examination generalized gingival enlargement was noticed which was covering cervical 1/3rd of almost all the teeth present in the oral cavity (Fig: 2). Teeth preset were incisors to second molars in all four quadrants. The tongue had deep grooves and fissures. A long prominent central groove was evident on the dorsum of the tongue going in a straight line with numerous small grooves and fissures running laterally from the middle third of the tongue (Fig: 3). An initial diagnosis of angioedema was made. Diphenhydramine hydrochloride, 100 mg, was administered intramuscularly followed by a course of diphenhydramine hydrochloride, 50 mg orally, four times a day. After 24 hours no noticeable reduction in facial swelling was evident. Therefore, re-evaluation of the diagnosis was necessary. As a result of this history, recurrent cheilitis granulomatosa consistent with Melkersson-Rosenthal syndrome (MRS) was added to the differential diagnosis. A biopsy specimen of the affected lip area was sent for histopathologic examination, confirming the final diagnosis of MRS. On histopathological examination the mucosa consisted of parakeratinized, hyperplastic, stratified squamous epithelium overlying collagenous connective tissue. Within the connective tissue there were discrete aggregations of lymphocytes, generally with a perivascular distribution; however, some bad central foci of histiocytes consistent with granulomatous lesions. The histologic findings were consistent with cheilitis granulomatosa. (Fig: 4) Treatment consisted of application of lip gloss to prevent cracking of the exposed mucosa. No further treatment was deemed necessary except continuation of his regular biannual preventive recall appointments. Discussion: Melkersson-Rosenthal syndrome (MRS) classically shows a triad of orofacial swelling, fissured tongue and facial palsy. Oligosymptomatic form of this syndrome is more common one of the example is Miescher cheilitis.3Melkersson-Rosenthal syndrome may often go undiagnosed for some day as in present case. History states that Rossolino in 1901 was the first to describe a particular association of oedema of the face, facial nerve palsy and scrotal tongue, the syndrome was named after Melkersson and Rosenthal.4 In 1928, Ernst Melkersson, a Swedish physician, described a 35-year-old woman with facial edema and paralysis. Shortly after, in 1931, Curt Rosenthal, a German neurologist, described 3 patients who had fissured or plicated tongues in addition to orofacial swelling and facial palsies and proposed a link between the triad of symptoms. Subsequently, the triad of clinical findings came to be known as the Melkersson-Rosenthal syndrome. Although MRS is reported as commonly found during the second to fourth decades of life, there are many published reports of MRS in children and preadolescents, Roseman et al 7 described a case of MRS in a 7-year-old girl, Cohen et al 8 described four cases of MRS in children younger than the age of 11 years, and Yuzuk et al 9 described the case of a 13-year-old girl who presented with the oligosymptomatic form orlabial edema coupled with fissured tongue. Melkersson Rosenthal syndrome does not appear to have an obvious predilection for either sex, although Some claim that it is slightly more common in females. 6,7,8 No particular racial predilection has been noted in MRS. Etiology of this disease remains largely unknown. 10 In granulomatous cheilitis normal lip architecture is altered by presence oflymphoedemaand noncaseating granulomas in the lamina propria.TH1 immunocytes produceinterleukin12 and RANTES/MIP-1alpha and granulomas.Expressionof protease-activatedreceptor1 and 2 occurs in orofacial granulomatosis (OFG).HLA typingmay show HLA-A2 or HLA-A11.11 Pathogenesis of MRS was suggested by Hornstien.1 He suggested that abnormal regulation of the autonomic nervous system leads to excessive permeability of the facial cutaneous vessels. From this abnormal circulation, nonspecific antigens then stimulate the perivascular cells to form granulomas. Obstruction of perivascular vessels by granuloma has been proposed as a causative factor in the swelling. 1 Initially, a patient with MRS usually complains of painless facial swelling that has persisted for a long time. Further investigation may reveal a history of previous episodes of swelling associated with facial paralysis or fissured tongue that the patient has never connected. The most common symptom of MRS is recurring orofacial swelling in which the upper lip is more often affected. Other areas affected by orofacial swelling in MRS in order of frequency, are cheek, nose, eyelid, alveolar process, and chin.2,12 Zimmer et al 2 reported orofacial manifestations in 42 patients with MRS who were examined at their clinic: they also reviewed 220 cases reported in the literature between 1965 and 1990. They found that 82% of patients presented with labial swelling, 40% had swelling in other parts of the face, not including the lip, 24% had Bells palsy, and 59% had fissured tongue. Other areas of intraoral swelling were, in order of frequency, the gingiva ( 11 % ), buccal mucosa ( 16% ) palate (8%). and tongue (7%). The swelling of the face and lip is described as recurrent, nontender, nonpitting, and firm, but not of hard consistency. The orofacial swelling is usually sudden and, in most cases, precedes facial paralysis by weeks, months, and even years. 2, 5, 6. First episodeof edema sometimes accompanied by fever and mild constitutional symptoms (as seen in present case e.g. headache, visual disturbance) usually subsides completely in hours or days. Recurrences can range from days to years, each recurrent episode lasts longer and is more pronounced, and swelling may ultimately become permanent. 2,5,6 The facial paralysis associated with MRS is frequently indistinguishable from Bells palsy. The site affected by paralysis usually corresponds to the site of swelling. As in the present case with facial swelling, the paralysis is on right side. Each recurring episode is more profound and lasts longer. 6,13,14 Other neurologic presentations associated with MRS are altered taste, migraine headaches, and trigeminal neuralgia.2,5,6,13,15 Fissured tongue ( eg. lingual plicata) is usually found at birth and therefore considered an incidental finding of MRS. Nevertheless, fissured tongue is ten times more likely to be found among individuals diagnosed with MRS than in the general population. 2, 6, 15. Miyashita et al 16 described MRS in a 56-year-old woman, who was afflicted with cheilitis granulomatosa caused by lingual candidiasis of a fissured tongue. The edematous lesion, on histopathologic investigation, is a noncaseating epithelial cell granuloma with perivascular mononucleated lymphocytic infiltrate. Fibrosis of the granulomas is typical in long-term and recurrent lesions. 1,2,17 Differential diagnosis includes Crohn’s disease, sarcoidosis, Aschers syndrome, and allergic angioedema, leprosy, tuberculosis.1,5,15,17,18,19 In Lab studies Serum angiotensin-converting enzymetestmay be performed to help exclude sarcoidosis.Reactions to metals, food additives, or other oral antigens are excluded by using Patch tests which may be associated with some cases of granulomatous. 20 If found positive they are advised to avoid the allergen. Imaging studies like gastrointestinaltractendoscopy, radiography, and biopsy may be used to differentiate from Crohn disease. Chest radiography or gallium orpositron emission tomography(PET) scanning may be found helpful in excluding sarcoidosis and tuberculosis. Orthopentamogram (OPG) helps in ruling out presence of a chronic dental abscess. A final diagnosis of MRS is made from the clinical history and histopathologic assessment of the edematous tissue, which usually includes the lip. When biopsy of the edematous tissue is difficult or not warranted, then a history of recurrent idiopathic facial swelling associated with atleast one of the following two entities, idiopathic facial paralysis (ie. Bells palsy) or fissured tongue, is sufficient to make a positive diagnosis of MRS. Treatment of MRS is aimed at the facial swelling and the paralysis. Because the etiology and pathogenesis of MRS are not well understood, treatment continues to be empirical and, in most cases, unsuccessful. Fortunately, both the swelling and the paralysis are selflimiting and usually go into remission on their own. Treatment with oral prednisone or nerve decompression has been shown to be effective.1,5,6 Treatment with oral prednisone or nerve decompression has been shown to be effective.5 Also, interlesional injections with triamcinolone hexacetonide suspension have been shown to provide temporary benefit.12 Plastic surgery may be considered in the case of permanent fibrotic lesions. Nevertheless, thorough documentation by many dentists eventually allowed MRS to be included in the differential diagnosis. This case highlights the importance of good history taking, regular follow-up and thorough documentation for proper patient management. References: HornsteinOP. Melkersson-Rosenthul syndrome: A neuromucocutaneus disease of complex origin. Curr ProbI Dermatoi 1973 ;5:117-156. Zimmer WM, Rogers RS. Reeve CM, Sheridan PJ. Orofacial manifestations of MeIkersson-Rosenthal syndiume: A study uf 41patients and review of 22tn cases from the literature. Oral Surg Oral Med Oral PiU ho I IW:;74:61O-6I9. Rogers RS 3rd: Melkersson-Rosenthal syndrome and orofacial granulomatosis, Dermatol Clin.1996 Apr;14(2):371-9 Magid El Shennawy and Galala El Enany: Melkersson-Rosenthalsyndrome; Review of theliteratureand report of acase, The Journal of Laryngology Otology Volume87 / Issue09 /September 1973, pp 898-902 Green RM. Rogers RS, Melkersson-Rosentlial syndrome: A review of 36 patients. J Am Acad Dermatoi 1989:21:1263-1270. Orlando MR, Atkjns JS Jr. Melkersaon-Rosenthal syndrome. Arch Otolaryngol Mead Neck Surg I99O;116:728-729. Roseman B, Fryns JP, Van den Bergle C Melkersson-Rosenthal syndrome in a 7-year-old girl. Pediatrics 197S;61:490-491. Cohen HA. Cohen Z, Ashkenasi A, Straussberg R. Frydman M, Kauschansky A, Varsano 1. Melkersson-Rosen thai syndrome. Cutis 1994:54:327-32S. Yuzuk S, Trau H, Levy A. Shewaeh-Millet M. Melkersson- Rosenthal syndrome. Int J Dermatoi i9SS:24;456-457. Tilakaratne WM, Freysdottir J, Fortune F. Orofacial granulomatosis: review on aetiology and pathogenesis.J Oral Pathol Med. Apr 2008;37(4):191-5. Ketabchi S, Massi D, Ficarra G, et al. Expression of protease -activated receptor-1 and -2 in orofacial granulomatosis.Oral Dis. Jul 2007;13(4):419-25. Miele FA Jr. Tlie big lip. Diagnostic and treatment considerations. Gen Dent 1994;42O.i8-:59. Graff-Badlord SB. Melkersson-Rosen thai syndrome, A review of the literature and a case report. South Afr Med J 1981:60:71-74, Balatiieh AB. Pillai KG, Maiisour M. Ai-Khail AA. An unusual case of the Melkersson-Rosenthal syndrome. Oral Surg Oral Med Oral Pathol 1995:80:289-292. Winnie R, DeLuke DM. Mel kersson-Rosenthal syndrome: Review of literature and case report. Int J Oral Ma.illofac Surg 199;;; 1:115-117 Miyashita M, Baba S, Suzuki H. Role recurrent oral caniiidiasis associated with lingua plicata in Me I kersson-Rosen thai syndrome. BrJ Dermatol 199Ã ®:l.l2:.ll 1-312. Minor MW Fo^ RW, Bukant; SC, Lockey RF. Melkersson- Rosenthal sjndrome. J .Miergy Clin Immunol l9a7;S0:64-67. Kano Y, Shiohara T. Yagita A, Nagashima M. Association between cheilitis granulomatosa and Crohns disease. J Am Acad Dermatol 1993:281:801. Lloyd DA, Payton KB, Guenter L, Frydman W. Melliersson-Rosenlhal syndrome and Crohns disease: One disease or two? Report of a case and discussion ofthe literature. J Clin Gastroenterol I994;18:213-2I8. Fitzpatrick L, Healy CM, McCartan BE, Flint SR, McCreary CE, Rogers S. Patch testing for food-associated allergies in orofacial granulomatosis.J Oral Pathol Med. Jan 2011;40(1):10-3. Figure legends: Figure no 1) extraoral photograph showing swollen upper and lower lips. Figure no 2) intraoral photograph showing generalized gingival enlargement Figure no 3) intraoral photograph showing deep grooves on dorsal surface of tongue Figure no 4) photograph showing histological presentation of chilitis glanduralis at low power (10X) and high power (40X) Learning ponts Concomitant presence of orofacial swelling, fissured tongue and facial palsy or any one of them may be a case of Melkersson-Rosenthal syndrome (MRS). A final diagnosis of MRS is made from the clinical history and histopathologic assessment of the edematous tissue. Melkersson–Rosenthal syndrome may recur intermittently and can become a chronic disorder. Gold: History, Properties and Nanoscale Analysis Gold: History, Properties and Nanoscale Analysis Since first extracted in the 5th century, Gold has been regarded as one of the most important matters in the world. When divided into smaller fragment sizes, way below 100nm it becomes even more ‘precious’. The optical, catalytical and electronic properties of Gold nanoparticles differ greatly from those of their bulk counterparts. This is mainly due to the large surface area-to-volume ratio as well as the spatial confinement of the free electrons of Gold nanocyrstals. Gold at Bulk scale Noble metals such as Gold, silver and platinum exhibit plasmonic properties. When the surface of a noble metal is hit with incident light, electrons which are situated on the surface begin to oscillate. This is known as the surface plasmonic resonance (SPR), as illustrated in figured 1. Metals are able to absorb and reflect light with great efficiency to their SPR. It is because of these plasmonic properties that noble metals such as Gold, silver and platinum are widely used in jewellery. Moreover being highly reflective metals makes them very appealing to the eye. Plasmonic properties arise due to noble metals having delocalised electrons on the surface. An atom consists of protons, electrons and neutrons. The nucleus is made up of protons and neutrons and the electrons spin around the nucleus in different orbitals. There are many orbitals in metals which overlap and form metallic bonding between the atoms. In the bulk form, there are many delocalised electrons within the metal that cause metallic bonding. This in turn allows the electrons to flow freely between the nuclei. Good electrical and thermal conductivity is due to the delocalised electrons Gold at Nanoscale Reflection does not occur in particles which are smaller than the wavelength of the incident light; however there is still an interaction between the nanoparticles and the light. The two main interactions are light scattering and light absorption. Electrons tend to oscillate at the same frequency as the light which was absorbed causing a dipole moment around the nanoparticles where all the electrons on the surface of the nanoparticle are oscillating. The oscillating dipole is known as a localised surface plasmon resonance (LSPR). Electromagnetic radiation is released when these electrons are oscillated. This can be seen in figure 2. The secondary electromagnetic radiation released by the nanoparticles is called scattered light. The electromagnetic radiation that is released has the same frequency History The synthesis of colloidal gold, or nanogold as it is now called, has been known to man since the ancient times. Although the process was not fully understood, synthesis of colloidal gold was crucial to the 4th century Lycurgus cup. The Lycurgus cup was known to change colour depending on the direction of light. Later it was used as a method for staining glass. A potion made from gold, which was also known as an Elixir of Life was discussed, and may also have been manufactured, in ancient times. It was not until the 16th century that the alchemist Paracelsus, claimed that he had created a potion called Aurum Potabile. (latin: potable gold). It was in the 17th century that the glass-colouring process was refined byAndreus CassiusandJohann Kunckel, allowing them to produce a deep-ruby coloured form of glass. However modern scientific evaluation was first made by Michael Faraday in the 1850s. Faraday is said to have been inspired by previous work done by Paracelsus. In 1857 Faraday prepared the first pure sample of colloidal gold, which he called activated gold, in 1857. Phosphorus was used to reduce a solution of Gold chloride. For a very long time chemists were unclear about the composition of the Cassius ruby-gold. Several chemists suspected Cassius ruby-gold to be a gold tin compound due to its preparation, However it was Faraday who was the first to recognize that the colour was actually due to the minute size of the gold particles The first colloidal gold in solution was first prepared in 1898 by Richard A. Zsigmondy. Shape and size tuning Fine tuning of shape and size in a controlled environment is one of greatest challenges faced by material scientists. These factors are not only very important in the rational design of nanomaterials, but are also equally as important for their applications. This is because many of their catalytical, optical and electronic properties of nanomaterials depend greatly on their size and shape. In Gold nanorods the longitudinal plasmon wavelength exhibits a nearly linear dependence on their aspect ratio, making it one of the most intriguing properties possessed by Gold nanorods. Moreover, even when looking at Gold nanorods with the same aspect ratio, the plasmon resonance properties are strongly dependent on the shape of their head. Over the past five years, the ability to finely tune the shape and size of Gold nanorods, has made huge progress. Seed mediated growth Gold nanospheres Changing the diameter of the sphere can easily and effectively tune the optical properties of gold nanospheres. This can easily be shown using the Mie Theory, which has been successfully shown to model the light scattering and absorption properties of spherical particles on a nanometer scale. The intense peak in the spectrum for each particle can be seen in figure 9. This peak is caused by the oscillating electrons which in turn produce a single dipole. Increasing the diameter of the gold nanosphere results in shifting the peak to a higher wavelength, this indicates the interaction between the light and particles is changing. In comparison to bulk gold (figure 4), the optical properties of gold nanospheres differ immensely. The local medium can also change the optical properties of the particles. This is due to the LSPR of the particle interacting with the medium. A change in the medium can result in a measurable change in the optical properties of the particles. In addition shape of the gold nanoparticles can significantly alter the optical properties. Gold nanorods Gold nanorods are of great interest due to their biocompatibility and NIR ( near infra-red) optical properties. The shape of the gold nanorod is what determines its NIR properties. The non-spherical shape of the particle causes two different dipoles to form when interacting with light. The transverse dipole (diameter) and the longitudinal dipole (length) account for the oscillating electrons throughout the particle. The dipole interactions affect the optical properties of the particles. GNR LSP illustration Optical properties of GNRs The aspect ratio (A.R) is defined as the length over the diameter of the Gold nanorod (GNR). The shape of the particle causes the absorption and light scattering spectrum to have two peaks: longitudinal and transverse. The interaction between these two dipoles causes the longitudinal peak to be observed in the visible to NIR region. The longitudinal peak is much more intense than the transverse peak and can be tuned by changing the aspect ratio of the gold nanorods. As the A.R of the gold nanorods is increased, the longitudinal peak shifts into the NIR region. The optical properties of GNRs have been successfully modelled using Gans theory and Discrete Dipole Approximation (DDA). Two equations were derived using the two theories to output the longitudinal peak wavelength by inputting a given aspect ratio. GANS THEORY DDA The two equations can predict the A.R of GNRs using absorption data collected from the UV-Vis-NIR spectrophotometer. The equations can give preliminary estimation of the A.R before observing the particles on a TEM. Figure 11 displays the absorption data, estimated A.R from theory, and a visual representation for a set of GNRs with different aspect ratios. The tunable optical properties of the GNRs make them very desirable for a wide range of applications. The visible representation shows a colour shift as the A.R changes. Visual representation of different shapes and sizes of GNRs Normalised absorption of the particles

Caesar :: essays research papers

Many people associate the ‘Ides of March’ with the play “Julius Caesar.'; That particular day, March 15th in 44 BC, Rome lost not only a future king, but also a strong political and military leader. Julius Caesar’s life, his accomplishments, and his unfortunate assassination have etched out a place in textbooks worldwide. Caesar’s childhood was filled with many changes in the Roman Empire.   Ã‚  Ã‚  Ã‚  Ã‚  Gaius Julius Caesar was born in Rome, Italy on July 12th or 13th in the year 100 BC. When he was young, Caesar lived through one of the most horrifying decades in the history of the city of Rome. The city was assaulted twice and captured by Roman armies, first in 87 BC by the leaders of the populares, his Uncle Marius and Cinna. Cinna was killed the year that Caesar had married Cinna’s daughter Cornelia. The second attack upon the city was carried out by Marius’ enemy Sulla, leader of the optimates, in 82 BC on Sulla’s return from the East. The confiscation of property resulted from the massacre of political opponents on each occasion. At the time of Caesar’s birth, the number of patricians was small, and their status no longer provided political advantage. (Sahlman). Caesar’s family was part of Rome’s original aristocracy, although they were neither rich nor influential. (Sahlman). Caesar’s father died when Caesar was only 16 years old. It was Caesar’s mother, Aurelia, who proved to influence young Caesar. (Sahlman). With his mother’s blessing, Caesar sought out to gain notoriety for his family name.   Ã‚  Ã‚  Ã‚  Ã‚  To obtain distinction for himself and his family, Caesar sought election to public office. In 86 BC, Caesar was appointed flamen dialis with the help of his uncle by marriage, Gaius Marius. (Sahlman). In 84 BC Caesar married Cornelia, daughter of Lucious Cornelius Cinna. (Sahlman). In 82 BC Caesar was ordered to divorce his wife by Lucious Cornelius Sulla, an enemy of the radicals. (Sahlman). Caesar traveled to Rhodes in 78 BC to study rhetoric and did not return until 73 BC. (Sahlman). During his journey to Rhodes pirates managed to capture him. Caesar convinced his captors to raise his ransom, which increased his prestige. He then raised a naval force, overcame his captors, and had them crucified. In 69 or 68 BC Caesar was elected quaestor. (Sahlman). His wife died shortly thereafter. Soon after his wife’s death, Caesar met and fell in love with Pompeia, a relative of Caesar’s then friend, Pompey.

Lord of the Flies - Savagery Essay -- English Literature Essays

Lord of the Flies - Savagery â€Å"There are too many people, and too few human beings.† (Robert Zend) Even though there are many people on this planet, there are very few civilized people. Most of them are naturally savaged. In the book, Lord of the Flies, by William Golding, boys are stranded on an island far away, with no connections to the adult world. These children, having no rules, or civilization, have their true nature exposed. Not surprisingly, these children’s nature happens to be savagery. Savagery can clearly be identified in humans when there are no rules, when the right situation arouses, and finally when there is no civilization around us. Without rules, savagery takes over. Without rules, man is free to do whatever he desires. Meaning, their true nature will be exposed. That nature is surely savagery. For example, when you watch little kids, you tend to notice that if one has a toy, the other will start a fight just to get a toy. Since the kids don’t know the difference between rights and wrong, they’re just expressing themselves naturally, which happens to be savagery. Here is a quote from Golding from chapter 4 of his book that proves that rules are the basis to civilization. â€Å"Roger gathered a handful of stones and began to throw them. Yet there was a space round Henry, perhaps six yards in diameter, into which he dare not throw. Here, invisible yet strong, was the taboo of the old life. Round the squatting child was the protection of parents and scho...

Dental X-ray Tech

Everything was set; I placed the film In the mannequins' mouth, positioned the mannequins head, positioned the x-ray beam, and then pushed the button. All of a sudden, all the electricity went out! Oh my Lord, what did I do! I broke the machine, I thought to myself. Just then another student shouted â€Å"Look, the lights in the city are all going out†. We were having a major blackout in New York City. What a lucky break for me, I thought. So with a sigh of relief, we all quickly gathered our belongings to leave the bulging for security purposes, and into the night we went.My classmate and I owed to stay together, until we both reached home Dental X-Ray Techniques safely, and being two female teenagers at 17 years old, we were both as frightened as little rabbits. That night was one of the longest and scariest nights of our lives; we only had $3. 00 dollars between the two of us and at that time a 35 cent token each. With all the chaos of looting; price hiking of the cabs; and flashers coming out of Bryant Park, we were truly thankful and grateful for making it home safely.School was delayed for about a week, but I did manage to complete and pass my test and resume my studies. Graduation Day came in October of 1977. We were all dressed In starched white uniforms, white stockings, white shoes, and white nursing caps looking very professional. My family and I were very proud when I receive my certificate of Proficiency (exhale: 1). About one week after graduation, I went on a job interview and landed my first dental Job at 1 Hanson Place, Brooklyn New York in the dental field of Orthodontics. Dry.Robert Fisher was a very well known Orthodontist in New York, and he loved teaching all the ladies in the office all they should know about the field. Although we all rotated between his two offices, one In Brooklyn, and another In Manhattan and had other duties as assigned, In his particular offices, one of my mall responsibly was to take and develop all types of x-rays on each patient. This was due to the excellent grades I received in school that Dry. Fisher viewed. The x-rays consisting of: 1. A full mouth of Periodical x-rays 2. A Pandora x-ray 4. A Wrist-plate x-ray 5.An Causal x-ray 6. Four Bite-wing x-rays A full-mouth series of Periodical's consist of: Eighteen small film x-rays, strategically place in the mouth one at a time, to capture al thirty-two teeth in a persons' mouth. This x-ray is primarily used to diagnose abnormalities involving the roots and bone. If there are missing teeth you still have to capture the anatomy of the spacing. All cavities on the crowns of the teeth or roots of the teeth will show up for the doctor to view. This is what is known as an intra-oral dental x-ray, because the film is placed inside the mouth.A Pandora x-ray: A Pandora x-ray is an x-ray that captures a persons' complete upper and lower teeth; jaw-line; eye-socket's; and face-plate of the person. The film is place in a large assets off large x -ray machine. The patient is then positioned to bite on a grooved bite stick that is attached to the machine. Temple stabilizers are closed at the temples of Dental X-Ray Techniques the head and the chin is lifted slightly upward and resting on a chin-rest. This cassette is made to revolve around the patient's head, while the patient is in a non- moving standing position.This is what is known as an extra-oral dental x-ray, because the film is positioned outside of the mouth. Spectrograph x-ray: A Spectrograph is an x-ray that captures a patients' entire skull. This is also an extra- oral x-ray, and it shows the profile of the patient and how far the teeth and Jaw-line is protruding. It helps the doctor assess which way to align the patients' teeth and Jaw. Hand-wrist-plate x-ray: This is an x-ray that is taken on children only to allow the doctor to see the growth pattern in a child.It helps the doctor to see if the children's teeth are growing normally or not, and how fast or slow a child is growing. In relations to their teeth, it allows the doctor to know ahead of time what treatment of movement to the teeth loud be needed to help the child. This x-ray also determines the real age of the child. An Clausal x-ray: An Clausal x-ray is a large x-ray that shows how wide or how narrow the palate of a person's mouth is, and the full arch of the upper (maxillary) and lower (mandible) teeth.Bite-wing x-rays: Bite-wing x-rays are four small x-rays, taken in the posterior (back teeth) part of the mouth, that show the crown of the teeth; the gum-line; and cavities on the crowns and in between the teeth. These x-rays also help to show the early stages of periodontal disease. When I first entered the Veteran's Administration in 1988, infection control for dental radiology was one of the most important standard we had to know. Even though we did have an assigned X-ray Technician, we as Dental Assistants also had to know all about dental x-ray techniques, since there are s o many aspects to know about taking dental x-ray.But the important immediate basic (exhibit: 2) We were taught in the Veterans Administration that before bringing a patient into the x-ray room you have to be sure that the room is clean and disinfected on all surfaces that are touched by anyone. The Assistants should wash their hands before putting on gloves because gloves must be worn at all times. Then, surfaces such as; the control panels; biting apparatus; exposure switch; counters; the tube of the machine; and any handles that are touched should be covered with a special plastic barrier tape that is easily peeled off once you are finished.But this tape should be placed in view of the patient, so they can see and know that the coverings are fresh and clean. After, the Assistant should wash their hands again, because some gloves contain powder inside them. Before any dental x-rays are taken ask the patient to please remove all earrings; tongue piercing; face piercing; hair pins; a nd sometimes even necklaces, so that these things do not interfere with the reading of the x-rays. The Assistant can start by letting the patient know that it's okay if they gag and that they will take things very slow to make them comfortable.So if the Assistant does encounter a gagger there are different methods that can be used to tried and alleviate the gagging such as: putting a little oral topical anesthesia on the tongue and palate; sometimes telling he patient to lift one leg slightly off the floor and holding it there, (with this method it gets the patient to concentrate on the lifting instead of what's being done in the mouth), and even asking the patient to take a deep breath and holding it sometimes help.Using Petitioned film is also tried at times since this film is very small and generally used on children. Since periodical x-rays are the ones taken most often, it is better to take this particular x-ray by using a film holder for paralleling called the â€Å"Rain ICPà ¢â‚¬ , this holder takes the guesswork out of site angling. Then by centering the x-ray beam over the film, you will prevent cutting off any vital anatomy, which is called, â€Å"cone cutting†. Always develop a sequence when exposing your film so that no area is missed or overlooked.Starting with the anterior (front) teeth first is the easiest area for the patient to tolerate, then work your way to the back. This helps the patient to gag less, and allows the Assistant to achieve getting as many of the eighteen x-rays as possible. There will be times when a patient Just does not want to have an x-ray because they fear the radiation (exhibit: 3). Try to have patience and explain to the patient that the doses of radiation are very small compared to the benefits of diagnosing any problem.But when you can take the x-rays the Assistant should factor in all the safety measures for themselves, and the patient. By using a Thyroid Collar on the patient, thyroid exposure is reduced by fifty percent while a lead apron reduces Next, only the Assistant and the patient are allowed in the x-ray room during exposure. Then, the Assistant must stand in a safe place, preferably at least six feet away behind a barrier and not in direct contact to the beam. If you cannot stand six feet away, then stand outside of the room.No Assistant should ever hold the films in the patient's mouth, like they use to do in the days of old, and never hold the beam or tube head to stabilize it during exposure. There are many organ in a persons' body that are radiotherapist and these organs are: the reproductive organs; the thyroid glands; a fetus; female breast; your skin; the lens of your eyes; and blood forming organs. Damage to these organs can result in a person getting cancer; inherited mutations; birth defects; cataracts; and leukemia. A way in which we were taught to reduce radiation exposure to patients is by using the â€Å"A.L. A. R. A. † concept, which stands for â€Å"As Low As Reasonably Achievable†. This means that every reasonable step to reduce radiation exposure too person will be used. The Assistant should always use protective wear when handling radiography and touching patients such as: gloves; surgical masks; protective eye wear; and a protective gown in case the Assistant do encounter a gagger. If the patient is still a little frightened, let them know that the Doctor cannot give a lull exam without the x-rays, and if that doesn't work, let the Doctor speak to the patient.Never x-ray any woman if you see or suspect her being pregnant. When cleaning up the x-ray room after use, the Assistant must remember to remove all the plastic barrier tape; dispose of the gloves and dispose any other supplies used, in the proper waste containers. The room must be cleaned and disinfected, even on surfaces that were not covered; turn off the x-ray machine and place the tube in a resting position, which is usually against the wall. Hang the lead apro n up, and aka sure it is not folded, because folding the apron damages the lead inside.Never re-drape the room with the plastic for the next patient, because the next Assistant won't know whether it is clean or not, and neither will the patient. Keep an accurate check on all your x-ray developing solutions and always follow the manufacturer's instructions, whether you have a manual developer or an automatic developer. As a Dental Assistant, I have taken x-rays on patients for approximately thirty years. I have taught many of my co-workers in the Veterans Administration how to SE the newest digital x-ray machines in the clinic, and I am knowledgeable in processing x-rays as well as mounting them (exhibit: 4).My knowledge of policies and procedures come from my ability to research and review available records and locate required documents through our â€Å"Decentralized Hospital Computer Programming† system. In dental the basic standards of policies and procedures are: wearing lead aprons; technicians wearing their radiation badges; exercising quality control; monitoring exposure levels (ALARM); knowing and extending patient privacy information; Health Insurance Portability and Accountability Act; and excellent customer service.

Is the United States winning the war in Iraq? Essay

Is the United States winning the war in Iraq? War is a word that brings a sad feeling in the minds of listener. This word is associated with fight, blood, death, miseries, pain and trouble for many but war is also associated with winning, freedom, and authority. Iraq is a very small country as compare to United States of America, but having a tradition of love for expansion, power and control. On the other hand United States of America, the only existing super power after cold war but seriously threatens by terrorist, expansionist and extremist forces of the world after attacks on twin towers in 2001. US has launched war against terrorism as a counter measure to curb above mentioned forces and attacked Afghanistan which was favored by most of the countries like Britain, Nato Countries etc. Attack on Iraq was also a continuation of War against terrorism due to charges of human rights violation, coalition and support to extremist and terrorist groups coupled with construction of weapons of mass destruction. Iraq was facing sanctions after Iraq Kuwait war in 90’s; its economic conditions were severely awful. Being a country with plenty of natural resources Iraqi people were suffering from economic recession, political aggression, and poor international relations. Iraqi ruler was a dictator having tradition of violating human rights. These issues were not only a threat for United States but to all peace loving forces of the world. All the above facts paved ways for a new turn in War against terrorism. President Bush said it clearly in an interview with MSNBC that â€Å"Americans did not start war against terrorism but we will win it† (Bush, 2004) According to American lobby they are victims rather than slaughterers. America attacked Iraq to safe themselves and all the people of the world because if those weapons of mass destruction will left with Iraqi regime then no individual in any part of the world will be safe. It seems reasonable to the world. Therefore it gained favor from majority of nation and their population. Thomas Donnelly, a resident fellow at the American Enterprise Institute (AEI) said â€Å"The American and coalition forces invasion was justified and paved ways to a new era of democracy and justice in Middle East. † Iraq claimed that all claims made regarding weapons of mass destruction are bogus and America attacked Iraq because of American strategy to take control over Iraq’s oil reserves and enrich land. It will also give ways towards a solid position in Asia and will helpful in curbing down China. The war started and is still going on and according to officials will not end in near future. Is America winning war in Iraq need many other questions to address for having a clear, unbiased and logical reasoning like what war in Iraq has given United States specifically and to the world generally? War in Iraq brought peace and harmony in the world. It gives strength to the peace loving forces of the world and shows all the dictators and extremist forces of the world that human lives are most important assets and United States of America will not let any one play with innocent souls of innocent civilians. Taking Sadam Hussain’s into American custody gives end to an era of violation, obsession, and victimization. It also convey message to the world that justice is still prevailing in the society. On the other end war in Iraq was fought to save lives of innocent civilians of the world from cruel weapons but the weapons used in Iraq by united forces and America were also cruel because they were also not able to differentiate between terrorist, and innocent people when they explode in markets and civilian places of Iraq. Innocent people were dead due to the attacks in Iraq in fact they are still dying. In these innocent people not only Iraqi civilians are included but it also included all those military officials and soldiers those were dead in Iraq due to the counters attacks and gorilla fights between Iraqi people and United Forces. These soldiers were sent to Iraq on a war that was started to reduce miseries, trouble and pain in lives of 9/11 victim’s families but now their families are suffering with same pain, trouble and miseries of loosing their loved ones. Strategically if one calculates what United States is spending in Iraq till today, it will be equal to millions of dollars and if that money will invest on welfare activities it will resulted in better outcomes. The war in Iraq asks a very important question to all peace loving nations that â€Å"Is war a solution of all problems? † Is life of American those dead in 9/11 and other terrorist attacks are more important than lives of Iraqi and Afghani civilians? Even if America is still not able to prove it claims regarding presence of weapons for mass destruction in Iraq. Is an attack on twin towers is more vital than several attacks on Iraq? No. Definitely not and this is what general consensus is started to develop among neutral actors inside and outside USA. Vast majority in United States of America is feeling that the cause of war against terrorism was correct, genuine and need of the time but the way it was fought should be different. Because if we critically analyze the current situation we will feel that War in Iraq gave us nothing except lesson that â€Å"Any War that is fought with weapons give nothing except pain to both winners and losers. † This concept is enforce by the decision of American nation to giving votes to the democrats in recent elections rather than republicans those election campaign revolves around the effects of war in Iraq and Afghanistan on American nation and the future of war on terror. The war in Iraq was started around three years back and no body knows when it will end. Apparently Sadam Hussain and his allies are in custody, Iraq has American and Coalition forces deputed for peace keeping but there is also a doubt that this war is leading towards the same situation that has happened with USSR for America. â€Å"No one can guarantee that any course of action in Iraq at this point will stop sectarian warfare, growing violence, or a slide toward chaos. If current trends continue, the potential consequences are severe. †(The Iraq study Group report December 2006) because world has seen the what has happened with USSR in Afghanistan, how Afghanis threw them out of their country after more than 8 years and as a result USSR itself was vanished from the map of the world. The solution for this situation is address by Iraq study group in their recent report â€Å"Our most important recommendations call for new and enhanced diplomatic and political efforts in Iraq and the region, and a change in the primary mission of U. S. forces in Iraq that will enable the United States to begin to move its combat forces out of Iraq responsibly. † (The Iraq study Group report December 2006) The war in Iraq is a war between ideologies, it is a war between rights and wrong, it is a war between justice and cruelty but the American Nation as one unit need to develop consensus towards the future strategy against war in Iraq because it will not end unless it will be fought on all possible grounds rather than military and force because weapons can only create destructions, they can only win lands but not hearts of people and United States of America has a tradition of winning hearts with love, sympathy and understanding. Therefore it is essential to understand that â€Å"This struggle must be fought with ideas and undertaken not just by the political leadership and the military but also by all levels of government including diplomatic, informational, economic, social and cultural mean. †(Effect based operations and counter terrorism, pg 27). The conclusion of the prolong war lies in self assessment and self realization. It includes reviewing our strategy and reassessing our goals. The targets are many but the way to achieve them is still ambiguous. The elite leadership of Al Qaeda and Taliban are still out of reach of United States. The strategy need to device through cooperation and collaboration on diplomatic and political fronts to support self sufficient and democratic Iraq where freedom and respect will prevail because peace and harmony in America cannot be kept at sake of Iraq. BIBLIOGRAPHY: 1.Effect based operations and counter terrorism, Air & Space Power Journal fall 05, 2005, Diane Publishing, pg 129 2. Bush clarifies view on war against terrorism ‘We will win,’ just not in conventional way, NBC, MSNBC and news services, national journal. com, Aug. 31, 2004 retrieved on Nov 20th 2006 from http://www. msnbc. msn. com/ID/5865710/ 3. Executive summary of The Iraq study Group report December 2006 4. Iraq transition to power retrieved from http://www. cnn. com/2006/POLITICS/10/23/iraq. poll2/index. html on 15th Dec 2006.