Techtonic Plates Essays - Plate Tectonics, Tectonics,

Techtonic Plates Lab Report The structure of the earth is made up of many layers, but the crust and the upper mantle make up the lithosphere. The lithosphere is divided into individual sections called plates. The rest of the mantle makes up the asthenosphere. Convection in asthenosphere causes the plates to shift and move about. We can tell where the plates are or have been because volcanoes and earthquakes have their own boundaries when the are active. Tectonic plates have three relationships with each other. The have convergent boundaries when they collide, divergent boundaries when they move apart, and transform boundaries when they slide past each other. The friction and heat caused by the plates sliding all over the place causes volcanoes if it melts the rock and earthquakes if the plates slip while sliding away and towards each other. The purpose of this lab was for us to investigate and learn about the three different kinds of plates. The model was used just like any model; To help us understand the different plates and how they work. The model is a great way to help show something which is confusing to tell in words. The lab was to construct a model showing the different kinds of boundaries. First we needed three worksheets each with a different plate on it, and three tacks to hold the plates in place. With scissors we cut out the plates and then we stuck the tacks through designated holes. With everything in tact you could move the model and see how the three plates slid back and forth against each other. 1. Along the East Rise, the plates spread farthest apart in the south (apposed to the north) 2. A convergent plate boundary exists along the Aleutian Islands of Alaska and also along the Andes Mountains in South America. Since they are convergent boundaries, that means plates around these two areas are colliding. 3. It would take Los Angeles 19,444,444.44 years to reach the location that San Francisco is in now. .6 miles = 1km 350miles La to San Fran 583.33 km =350 miles 583.33/.00003 = 19,444,444.44 1cm = .00001km Although this model was very helpful, it wasn't accurate. First of all, the model didn't show all of the plates on the earth. I think it would be important to see all of the plates to fully understand the plate tectonic theory. The model also doesn't show convection in any way. Convection would be important to show in the model because it and the combined force of gravity's what really moves the plates of the earth. The model doesn't have much identified landscape. There are a couple volcanoes labeled, but there has to be more then one mountain range on the earth.

Raising the Red Lantern essays

Raising the Red Lantern essays This film is a story of something greater than the actual story itself. Set in the 1920s in Northern China, a young girl finds herself involved in something that was not what she had imagined for herself. The main character is Songlian, a 19-year-old Chinese girl, who marries into the Chen Clan only to find herself as one of the four mistresses within a home of tradition and strict order. The geographical setting is appropriate as to the underline theme of the film and that is a feeling of isolation within the walls of the Chen compound. The gray walls of their living quarters strengthens this feeling of isolation experienced by all four women. The only color in their lives is the lighting of red lanterns signifying the sexual wishes of the Master Chen for that evening. The sound effects of bells and Chinese opera serves to enhance the intensity of their longing for real companionship. The relationship between the Master and his four wives is purely sexual. As a result, t he four women compete with one another to sway his affections by conniving and betraying the other for the sake of time spent with the Master. Songlian struggles more than the other wives because she is younger and educated. This is both an asset and a liability for her because the others are very jealous of her and this isolates her even more than the walls. In addition to sharing the Master, each woman including their servants must obey strict rules of the household. These rules act to further control women in an already repressive society of the time. This film is somewhat true to form because women of China especially during this period were very suppressed. Although Chen had wealth, the women were still treated as objects of status without choices or hopes of some kind of personal happiness only sacrifice. This is reinforced by the conversations about the importance of having a son and how having a daughter was considered a wasted birth. ...

Grand Valley Dani Peaceful Warriors Essay Example | Topics and Well Written Essays - 750 words

Grand Valley Dani Peaceful Warriors - Essay Example This research will begin with the statement that the people of the Grand Dani are believed to have resided in this area of New Guinea for centuries, according to Karl Heider. The technology of these people is very limited and the only resources that were basically utilized in the 70’s era were stones and bamboo instruments. Also, their way of preservation deals almost entirely on horticulture for sustenance. Their culture and previous style of life have practically vanished away, due to Western missionaries’ encroachments and the degree of far-reaching variables in the environment due to World War II. The sociological structure of the Dani people differs greatly from American society. They are not totally united as a social network and do not necessarily have to rely on one another’s individual contributions to the clan in order to persevere. The main lifestyle objectives of the Dani women are kept separate from the men. While the men do more technical and constr uctive work, the women’s primary attentiveness is on tending to the children, gardening, tending and feeding the pigs, making salt, and weaving carrying baskets. The work among these people is almost always assigned to gender or in an age categorization. What unites them as a whole is the similarity that they have in regards to their values, beliefs, and rituals. Though it might be hard to believe, the men are the ones that normally weave the skirts that the women wear. Furthermore, they are the ones that also perform the myriad of ceremonies and rituals. The men also build the wood and grass houses and ready the fields by plowing, for the women to be able to plant the sweet potatoes (Heider 2004). One quite notable difference between the Dani people and American’s is the definite lack of specialized skills within their community. The Dani’s primary food source is sweet potatoes, although they do have other fruits and vegetables as well. Their only meat source comes from the pigs that they raise (Heidi 1970). The Dani Valley consists of a huge network of fields which the Dani improvise on and develop into harvested areas for gardening purposes. This is a year round process and there is always a field in the procurement of being harvested (Heidi 2004). Their irrigation technique involves constructing ditches around the fields so that there will be a proper route for excess water to drain. These same ditches are utilized to allow needed water into the harvested fields in the dry season of the Dani Valley. The social organization of the Dani is divided into two groups. The Wida or the Waija, which are the two designated social circles within the community. This simply means that each individual person is an aspectual part of their father’s moiety. They are required to marry outside the moiety that the reside in (Heider 1996). Though this works well for their people and their belief system, there are instances when complications arise among this type of social structure. For example, every Dani is born into the Wida moiety, no matter the specification, of which group, the father is bound too. The separation of social recognition does not occur until marriage, during the pigs feast (Heider 1996). In regards to the political aspects of the Dani people, there are different allegiances. Extended family compounds become part of a large confederation, usually equaling 1000 individuals (Heider 2004). It is the confederations that co-exist in a stable and peaceful, multi unit society. Although they might present more stability in family life, the allegiances among them often change (Heider 1970). There are no written laws or any real legal constraints, unless verbalized. Also, they share the same unique culture and belief system despite what group they are affiliated with. Their belief in marriage has a very distinct variation from an American perspective. They believe in Polygony, which is the custom of having more

Express Delivery Sector Essay Example | Topics and Well Written Essays - 1500 words

Express Delivery Sector - Essay Example The performance of the transportation sector – as the broader area in which the express delivery sector operates – has been examined; it is assumed that the specific sector is quite competitive – for this reason it would be appropriately managed in order to increase its attractiveness towards the potential investors. The use of the appropriate CSFs would help the firms of this sector to keep their competitiveness at high levels, despite the market turbulences. 1. Structure of the ‘express delivery sector’ within the wider freight and transportation industry – evaluation whether this is an attractive sector to compete in. In order to understand the position and the performance of the ‘express delivery sector’ within the freight industry, it would be necessary to refer to the characteristics and the performance of this industry – as presented in the relevant literature. The freight industry is an extremely powerful sector; often, the practices of this sector are criticized as of their opposition with the international or the local legal rules. An indicative example of such case is the violation by the truck manufacturers of the anti-trust laws – reference is made to Britain. Such cases, related to ‘air cargo carriers and freight forwarders’ (Handy Shipping Guide 2010), have been developed in Britain. Despite the problems related to its activities, the freight industry is an extremely powerful sector, having the power, if appropriately monitored, to support the growth the economy. In accordance with a series of statistics published in 2007, ‘the amount of fr eight lifted in 2007 (1,869 million tonnes) was three per cent above 2006 (1,813 million tonnes)’ (Department of Transport 2007).... In other words, the industry has managed to stabilize its growth – despite the global crisis. The above fact is highlighted in a relevant report of the European Commission; in the above report emphasis is given on the increase of the ‘EU countries who invested on road freight transport in 2005-2007’ (European Commission 2008) .The potential of the industry to keep its competitiveness at high levels should be taken into consideration when the performance of the express delivery sector – as part of the freight sector need to be measured and evaluated. Moreover, the competitiveness of the freight industry would also lead to the increase of the competitiveness of the express delivery sector; therefore, the evaluation of the attractiveness of the industry would influence the attractiveness of the express delivery sector. Indeed, the trend for continuous growth in the freight industry seems to reflect a relevant trend in regard to the express delivery sector. The above view is based on a report referring to the importance of the express delivery sector for the economy of East Midlands; it is noted that ‘The express industry directly employs over 4,700 people in the East Midlands; Its contribution to regional employment is expected to rise to almost 16,000 by 2014’ (Oxford Economic Forecast, 2006). The Institute of Transport Management presents a similar view– published in 2007; in the relevant report it is sated that the express delivery sector is expected to benefit the British economy by approximately 5 billion each year – reference is made to a long term period, of approximately 20 years. On the other hand, Thompson (2007) notes that the performance of the freight sector is depended on indicators which are not standardized; for

Molecular Biology and Molecular Diagnostics Essay

Molecular Biology and Molecular Diagnostics - Essay Example The magazines are always aimed at the general public, therefore the language employed is standard and can be comprehended by any age group, individual. This paper aims at exploring the form and nature of molecular biology with the particular interest in understanding the interactions between the distinct systems of a cell. The paper will look at the interaction between RNA, DNA, protein biosynthesis, and how the interaction can be used in the diagnosis of a named disease. Molecular biology is concerned with the development, structure, and function of macromolecules critical to life (Carson, Miller, and Witherow, 2012, p. 19). The field digs deeper to explore the role of macromolecules in cell replication and how genetic information is transmitted from one stage of life to another. Basically, molecular microbiology aims at analyzing how the DNA can be manipulated in order to mutate or sequence it. A mutat3d DNA is usually inserted into the genome of a living being to offer some mutation effects caused by the phenomenon. Of late, there has been an increase in the study of molecules (Carson, Miller, and Witherow, 2012, p. 59). The studies have either been direct or indirect in their approach to the study of molecules. Direct studies have focused on the interactions of molecules (cell biology and developmental biology). Other indirect studies have focused on inferring historical attributes of species/masses (populations). A molecular diagnostic is a method that is employed to assess biological markers in an individual’s genetic code (in the genome and proteome). This aspect of cellular microbiology focuses on how the cells of individuals express their genes in the form of proteins. Molecular biology is applied in medical testing to monitor and diagnose diseases, identify risks, and decide on the kind of therapies that will achieve the maximum results (Clark, 2010, 170). ). Molecular biology has contributed to the detection and characterization of the management of disease-causing micro-organisms.  Ã‚  

Improving Tissue Support- Altered Cast Technique

Improving Tissue Support- Altered Cast Technique ABSTRACT Aim: Cast partial denture made using altered cast technique creates an environment in which the teeth and the edentulous tissues support the denture bases as compatible as possible, resulting in a more stable cast partial denture. Background: The tissues of the edentulous ridge in distal extension removable partial denture are liable to be displaced under occlusal pressure. This is a result of the displaceability of the mucosa. The difference between the resiliency of the residual ridge tissues and the teeth causes disparity of support, that causes the denture to rotate about its distal abutment, inducing heavy tortional stresses on the teeth and possible traumatisation of alveolar ridge. Studies have proved that better support and stability can be achieved in distal extension cases using functional impression along with altered cast technique. Case description: The following article is a case report of a distal extension cast partial denture using altered cast technique for better tissue adaptability and stress distribution. Conclusion: For recording Kennedy’s class I and II edentulous areas, optimum residual ridge coverage with a well fitting denture base is required. This reduces stresses, preserving the remaining supporting structures which can be achieved with the use of altered cast technique. Clinical significance: The altered cast technique allows the residual alveolar ridge to be recorded in functional form and relates to the teeth so that when the prosthesis is seated, it derives support simultaneously from the teeth and the soft tissues. Keywords: distal extension, stress distribution, functional impression, altered cast technique. BACKGROUND: The most important consideration in replacement of missing teeth for a distal extension removable partial denture as per DeVan’s statement must be â€Å"the perpetual preservation of that which remains, and not the meticulous replacement of that which has been lost.†1-4. When occlusal forces are applied to distal extension removable partial dentures, the forces must be distributed equally to the abutments and the tissues of the residual ridge.2 This cannot be accomplished on a master cast made from a single impression. A dual impression technique is used in which a â€Å"corrected cast† can be generated which can record and relate the tissues under uniform loading, distribute the load over as large an area as possible and accurately delineate the peripheral extent of the denture base.2 Functional impressions are defined as â€Å"The impression which records the form of the residual alveolar ridge under some loading whether by occlusal loading, finger loading, specially designed individual tray or consistency of recording medium.†5 Several methods may be used for registering the alveolar mucosa in its supporting form. The dual impression techniques are categorised as 1). Physiologic impression techniques. a). McLean-Hindel method, b). The functional reline method, c). The fluid wax method. 2). Selective pressure techniques.2 According to Leupold6 , the functional reline method is accomplished after the denture base has been processed onto the framework. The disadvantage being it requires a greater degree of occlusal adjustment after processing of acrylic resin and so it is necessary to modify the new denture before delivering it to the patient.6 So to overcome this the master cast is altered to accommodate the secondary impression and thus altered /corrected cast is generated.2,6. Cast partial denture made using the altered cast technique helps create an environment in which the teeth and the edentulous tissues support the base as compatibly as possible resulting in a more stable denture that improves the support for the occlusal relationship of the opposing dentition and the removable partial denture restoration.2,3. For preservation of the residual ridge, Becker and his colleagues, critically reviewed the evolution of removable partial denture and outlined six principles for its design which include a rigid major connector, multiple positive rest seats, mesial rests, parallel guide planes, the I-bar clasp design and the altered cast technique.7 This technique has the potential benefits of reducing the number of postoperative visits, preserving the residual ridges, improving stress distribution, decreasing food impaction and decreasing the torquing of abutment teeth leading to increased patient satisfaction.8-11. The following case report will explain the use of altered cast technique used in the fabrication of a distal extension cast partial denture. CASE DISCRIPTION: A 60 year old male patient reported to the Department of Prosthodontics Dr. D.Y.Patil Dental College and Hospital, Navi Mumbai with the chief complaint of missing teeth and difficulty in eating. Extra-oral examination revealed that the patient had an ovoid tapered face, with mild prognathism, competent and thick lips. Patient had a habit of cigarette smoking since 20 years and so was advised to stop the habit. Intraoral examination revealed that there was only one tooth 23 remaining in the maxillary arch and 31,32,33,41,42,43 in the mandibular arch. The teeth were lost due to caries and periodontitis. (fig.1,2) Radiographs were evaluated and the treatment was planned. Tooth supported overdenture for maxillary arch and cast partial denture for mandibular arch was planned. Diagnostic impressions were made in irreversible hydrocolloid (Imprint, DPI). The impressions were poured using dental stone (type III, kalrock) and casts were procured. For the maxillary arch, the canine was endodontically treated. Pattern resin (DPI) was then used to make a Thimble-shaped coping for the canine which will help in additional retention of the maxillary denture. Primary impression was made using irreversible hydrocolloid (Imprint, DPI) and custom tray was made. The coping was then cemented with zinc phosphate cement (Dentsply). Border moulding was done with low fusing compound (greenstick, DPI) and wash impression was made using polyether impression material (3M ESPE). Master cast was poured in dental stone (type III, kalrock). For the mandibular arch, Diagnostic cast were surveyed and cast partial framework design was planned. The design included Lingual Plate as the Major Connector, Modified Ladder shapped minor connector. RPI system was planned for the rests and guide planes on 33 and 43. Mouth preparation was done which included the preparations of rest seats on 33 and 43, guide planes on distal of canines. Composite build up on the mandibular anterior teeth was done for better anterior giudance. Impression was made in a custom tray using medium bodied polyether impression material (3M ESPE) and master cast was poured using dental stone (type III, kalrock). Cast partial denture framework was fabricated on the master cast. The cast partial denture framework was checked on the master cast and in the patient’s mouth for the fit. (fig.3,4). The cast partial framework was used as a part of the custom tray for recording the functional impression. Spacer wax (DPI) was adapted on the saddle area of the framework and acrylic custom tray was made using Self cure acrylic resin material (DPI). The custom tray was checked in the patient’s mouth for correct extension. Border moulding was done using low fusing impression compound (green stick, DPI). Spacer wax was removed to provide space for the wash impression material. Tray was coated with a layer of adhesives so that the elastomeric impression material adheres to it. Wash impression made using polyether impression material (3M, ESPE). The master cast was sectioned into 3 pieces with the help of a hand saw and the distal edentulous area was removed. (fig.5). The wash impression made on the framework was placed on the sectioned master cast making sure that it seats completely in the rest seat areas. (fig 6). The entire assembly was sealed using utility wax to prevent its dislogement or movement during pouring of the cast. Beading and boxing was done around the framework and sectioned master cast and the impression was poured using a different coloured dental stone (type IV, kalrock) to distinguish with distal extension areas. The cast thus obtained was the altered cast. (fig.7). Jaw relation was recorded and teeth arrangement was done. Try in of the maxillary and mandibular trial dentures was done and dentures were fabricated using Heat cure acrylic resin (Leucitone,Dentsply). At the denture insertion stage dentures were checked in the mouth for retention and stability. (fig. 9,10). Post insertion instructions were given and follow up at the interval of 1month and 3 months was done. DISCUSSION: The fabrication of distal extension partial denture is a difficult task since it involves taking support from both the tissues and the teeth. Both of them have different amount of movements when forces of mastication are applied to them. Thus, the use of special impression techniques becomes necessary. However, in some cases, soft tissue displacement is slight. As a result, the functional and anatomic contours of the ridge may be virtually identical. However, that was not in this case. The decision to use dual impression technique along with altered cast technique was determined in the beginning using a test. Here, first the acrylic denture base was made on the diagnostic cast and placed in the mouth and finger pressure was applied to the base. There was some amount of lift seen in the framework suggesting that there was some soft tissue displacement. So by using the dual impression technique we can get a precise and functionally formed denture border and seal.2,3,7,8. The dual impre ssion used is indicated for mandibular distal extension cases because of a limited ridge area, the mobility of the floor of the mouth, to record the stress bearing area and proper peripheral extension.2 There are two categories of dual impression techniques mainly the physiologic impression techniques and selective pressure techniques. Physiologic impression techniques record the tissues of the residual ridge in its functional form by placing an occlusal load on the impression tray during impression procedures. The methods are the McLean-Hindels method; the functional reline method; and the fluid wax method.2 The need for physiologic impressions was first proposed by McLean and others. He recorded the tissues of the residual ridge in a functional form and the remaining teeth in anatomic form. However the disadvantage of this technique being that the dentists could not produce the same functional displacement generated by occlusal forces because of design of tray being used.2,12 In response to this shortcoming, Hindel developed his impression procedure by modifying the tray as a result of which the finished impression was a reproduction of the anatomic surface of the ridge and the surfaces of the teeth. Disadvantage being that the tissues recorded in this technique continue to be in a functional form all the time. This results in compromised blood flow with adverse soft tissue reaction and resorption of the underlying bone. Also sometimes because of this there is presence of premature contacts of the teeth replaced which will not be acceptable to the patients.2,13,14 The Functional Reline technique and the Fluid wax method where fabrication of the distal extension denture is done before and the new surface is added to the intaglio of the denture base afterwards. It can be done in cases where the denture becomes loose. However, as in the earlier methods this method too, has some difficulties mainly, the problems caused by failure to maintain the correct relationship between the framework and the abutment teeth during impression making procedure and also failure in achieving accurate occlusal contact following the reline procedure.1,2,3,15. To overcome this, along with this method corrected cast procedure was used yielding a better result.1,2,3,9,10,15 In the mentioned case report we have made use of the altered cast technique along with selective pressure impression procedure. The main advantage of this procedure is that the framework was ready before we make the final impression and alter the master cast. So the adaptation of the framework to the teeth and the soft tissues doesn’t change after the final impression. Also the other advantages are, 1. Remarkable stability of the denture base in distal extension removable partial dentures. 2. A positive occlusion which will be maintained for long periods of time. 3. Reduced stress on abutment teeth from unfavorable forces. 4. Reduced numbers of post-insertion adjustments.2,7,10 CONLCUSION: Fabrication of a cast partial denture for mandibular distal extension class I cases is a challenge for the prosthodontist. Several functional methods have been proposed for recording the edentulous area and the abutment teeth. An altered cast technique for fabricating cast partial denture was used in the above article. This impression technique helps in registering and co-relating tissues of different resiliency. This improves the stability and support of the denture, resulting in optimal load distribution. CLINICAL SIGNIFICANCE: An altered cast technique is a way better and faster as compared to other techniques. In this technique the cast partial framework is kept ready before the recording of functional impression. Because of the correct fit of the cast partial framework this technique helps in recording the hard and soft tissues in a better way. Thus, it can be routinely utilized for the recording of distal extension area. 1

The Affliction in the Middle Ages :: Diseases Medical Health Essays

The Affliction in the Middle Ages Disease and death are most often associated with the Middle Ages because of the widespread plagues and ignorance of medical knowledge during that time period. It is difficult, however, to ascertain the true nature of illness in the early Medieval Ages because in some written sources, the author’s standpoint distorts the presentation of the disease or cause of a person’s death so that the biological cause is skewed and unattainable. Gregory of Tours, for example, writes about two priests of Sidonius Apollinaris who rebelled against him. Both of these priests died very close to the same time of Sidonius’ death. The first priest died while in the lavatory and the second priest died while listening to a servant’s vision. For the causes of both deaths Gregory gives the credit to God, saying â€Å"the Lord passed this earthly judgement on those two unruly priests† (135). Details about the deaths are not given, but according to Gregory, they are irrelevant because the deaths were acts from God. For the first priest, he writes, â€Å"he went off to the lavatory and while he was occupied in emptying his bowels he lost his soul instead† (134). Moreover, he compared the death to that of Arius’, who was considered a heretic and â€Å"in the same way emptied out his entrails through his back passage in the lavatory,† which signifies that Gregory thinks both men died due to heresy ag ainst God (134). Gregory even says that â€Å"God in his clemency did not permit this insult to go long unpunished† (134). It is evident that the affliction, according to Gregory, is due to God’s hand. Gregory is writing from a Christian standpoint and is a bishop who greatly admired Sidonius, described here as â€Å"saintly† and an â€Å"angel†. Gregory’s agenda is such that he would want to publicize the sins of Sidonius’ enemies while also glorifying God. This may lead him to give transcendent causation for the deaths of these priests. Since the priests and Sidonius died at around the same time, one would think that there is a possibility that they could have died from the same kind of illness. Also, since Arius and the first priest both died while emptying their bowels, it is not entirely improbable that they had been suffering from some type of intestinal or digestive disease that may have been prevalent in the time period.