Lead is a lustrous, silvery metal that tarnishes in the presence of air and becomes a dull bluish gray. Soft and flexible, it has a low melting point (327 °C). Its chemical symbol, Pb, is from plumbum, the Latin word for waterworks, because of lead's extensive use in ancient water pipes. Itsatomic number is 82; its atomic weight is 207.19.
Lead and lead compounds can be highly toxic when eaten or inhaled. Although lead is absorbed very slowly into the body, its rate of excretion is even slower. Thus, with constant exposure, lead accumulates gradually in the body. It is absorbed by the red blood cells and circulated through the body where it becomes concentrated in the soft tissues, especially the liver and kidneys. Lead can cause damage in the central nervous system and apparently can damage the cells making up the blood-brain barrier that protects the brain from many harmful chemicals.
Symptoms of lead poisoning include loss of appetite, weakness, anemia, vomiting, and convulsions, sometimes leading to permanent brain damage or death.
Children who ingest chips of old, lead-containing paint or are exposed to dust from the deterioration of such paint may exhibit symptoms. Levels of environmental lead considered nontoxic may also be involved in increased hypertension in a significant number of persons, according to studies released in the mid-1980s. As a result, the U.S. Centers for Disease Control in recent years have been revising downward the levels of environmental lead that it would consider safe. At one time, lead poisoning was common among those who worked with lead, but such workplace hazards have been largely curtailed.
Lead has been used by humans since ancient times.
It was used in ancient Egypt in coins, weights, ornaments, utensils, ceramic glazes, and solder. Lead is mentioned in the Old Testament. The
Romans
conveyed drinking water in lead pipes, some of which are still in operation.
Roman slaves extracted and prepared the lead, describes a disease among the slaves that was clearly lead poisoning. Because of their potential toxicity, lead water pipes are no longer being installed. The greatest single use of lead metal today is in the plates of storage batteries for automobiles. The protective oxidation layer formed by lead in contact with such substances as air, sulfuric acid, and fluorine makes it highly resistant to corrosion. For this reason, lead has been used to make drainage pipes and lead chambers in sulfuric acid factories. It is also used as a roofing material. The softness and malleability of lead make it useful for sheathing telephone and television cables. Lead is used in solder because of its low melting point. When combined with tin, lead forms solder
Jeremy Rifkin in the article " A Change of Heart about Animals" argues on the fact that as incredible as it sounds, many of our fellow creatures as like us in so many ways. For example, in a movie named Paulie a young girl that suffers autism gets attached to a parrot. The girl struggles to talk but she just can't. Time passes by and then the girl starts talking because the parrot helped her. An incident happened so the little girl's parents decide to let the parrot go. The parrot ends up in an animal testing lab but somehow he managed to escape. The parrot begins to miss his owner because he formed a bond with a human being. Obviously, this proves Rifkin is right when he states that animals experience feelings like human beings.
Across different works like Virgil’s Aeneid and Aeschylus’ Eumenides, In these representations of monsters, the initial relationship between gods and monsters is simple: all monsters derived from the gods. However, as soon as distinguishing features set the monsters apart, they prove Clay’s point that monsters are seen as threats who need to be contained and whose powers need to be exploited by the gods. The close reading of both texts reveal the relationship between gods and monsters along with the power structures between
 The purpose of this paper is to identify and contrast the different styles of leadership exhibited by two characters found in the 1949 movie Twelve O’Clock High starring Gregory Peck as General Savage, Army Air Forces general. Based on a true story, Twelve O’Clock High is a inspirational account of the highly dangerous precision daylight bombing missions carried out by US Army Air Force’s 918th Bomber Group in England during the last part of World War II. In the beginning of the movie the squadron is commanded by general Davenport. It is very clear that General Davenport’s main concern is the wellbeing of his men. He obviously had developed close interpersonal relationships. The men of the squadron were completely devoted towards Davenport and they trusted any decision that he would make. General Davenport’s affection for his men comes to interfere with his ability to lead them. The squadron suffers heavy losses to planes and heavier losses to soldiers. One instance that clearly demonstrates Davenport’s incapability to uphold his responsibilities as the leader is when he jeopardizes the well being of the entire squadron by ignoring protocol and flying out of formation in the attempt to save one plane. When it becomes apparent to Davenport’s superiors that his emotional feelings have become an obstacle to his effectively leading the squadron they relieve him. General Savage who is ordered to take over the underachieving bomber group experiencing heavy losses because of poor technique and lack of focus. Savage takes a kind of tough love approach, holding his men to the highest standards. Savage makes the point that the ultimate objection of the squadron is to successfully complete the assigned missions. Throughout the movie Savage constantly makes it absolutely clear to the squadron that no one individual’s wellbeing will be placed ahead of the entire team and the success of the team. Initially the changing of the preceding General dispirits the squadron. They felt that General Savage was uncompassionate considering the men as nothing more then numbers that were dispensable at his convenience. After several missions that were marked by a remarkable turnaround in success the man eventually come...
My hypothesis that ducks have feelings is based off my own observations while using texts from other sources to support it. I used the article “Yes, Animals Have Feelings” which discusses how animals do have feelings to support my hypothesis. Balcombe states, “Their desire for rewards is part of sentience — the capacity to feel” (Balcombe). While observing the ducks I wrote down their behaviors and linked them with an emotion. Some of the emotions I saw in the ducks were happiness, trust, and caring. One of the observations I made was when many of the ducks were in the pond. The ducks would chase each other around in the pond as if they were playing. Before they began chasing each other I watched to see if there was a reason behind it such as taking food away from the other duck or irritating the duck in anyway. I did not notice any type of
As the movie goes on, Gwen exhibits signs of withdrawal from alcohol. She continues to avoid people in group therapies, meetings and activities. Gwen, at this time of the movie, is just trying to continue going and survive her symptoms of withdrawal. Eventually, Gwen makes a desperate attempt to cure her withdrawal symptoms and take the pills that she threw
Originally presented in the 1964 article “A contingency model of leadership effectiveness”, Fred Fiedler’s Contingency Theory states that there is no one best managerial style effective for all situations. Rather, effective leadership is attained when leader style and situational forces or aligned. (Fiedler, 1964)
When talking about leadership, one cannot help but wonder how it relates to nursing. If the focus of nursing should be caring for patients who are either well or ill, then why is there a need to tackle leadership? Unlike before, today’s health care environment is complex, rapid and continuously changing. This development prompts an upcoming danger to the nurse’s skills, identity and ability to coordinate with other health care professionals. On the other hand, this also makes nurses challenge their own into taking the lead, developing goals, consolidating a purpose and moving towards an attainable vision. A nurse leader then needs to combine clinical, administrative, financial and operational skills to effectively solve various clinical challenges. These challenges are the rationale behind tackling the need for leadership in nursing.
Theories of human nature, as the term would ever so subtly suggest, are at best only individual assertions of the fundamental and intrinsic compositions of mankind, and should be taken as such. Indeed it can be said that these assertions are both many and widespread, and yet too it can be said that there are a select few assertions of the nature of man that rise above others when measured by historical persistence, renown, and overall applicability. These eclectic discourses on the true nature of man have often figured largely in theories of political science, typically functioning as foundational structures to broader claims and arguments. The diversification of these ideological assertions, then, would explain the existence of varying theories
Section A: It is known as ancient because it has been mined for more than 6,000 years. There isn’t really a person that discovered the element of lead. Small lead pieces can be found in Colombian Peru, Yucatan, and Guatemala. The Greeks mined lead on a large scale from 650 and onwards. They knew not only how to obtain the metal but, how to convert it to white lead. The Greeks started the base of lead paints, which continued until the middle of the last century. The Romans also knew how to mine it. The mined in Spain and Britain. They used the leads features to making water pipes, coffins, and tableware. It ended up reappearing in the medieval times, which allowed them to find new uses such as, pottery glazes, bullets, and printing tables. Lately, it has been used as fuel additives.
Abel, Donald C., ed. Theories of Human Nature: Classical and Contemporary Readings. New York: McGraw-Hill, 1992.
When we were first given this assignment I had not put much consideration into it. I thought we were to ask a couple of questions, it would all work itself out and I would be done. But this was not the case. The thought and reflection put into interview questions really surprised me. There was far more factors other than the questions you were asking, because you were also dealing with people, people who are giving you there free time, their attention and opening themselves up to you a stranger, so there were far more responsibilities then what were initially at hand.
In conclusion, the role-play interview helped me have a better view of my interview skills, including skills that I am able to apply appropriately and those that I have to keep practising. Through this session, I came to know that I am good at using questions to know more about my clients. However, I need to improve my listening skill in order to understand my clients’ points of view. This may also help me to respect their values after learning more about the situations. Therefore, I will be less led by my biases after understanding my clients’ perspectives. Hence, I believe that self-reflections help counsellors to be aware of their strengths and improve their counselling skills in order to help others.
Do animals feel joy, love, fear, anguish or despair? What ere emotions, and perhaps more importantly, how do scientists prove animals are capable of emotion? Sea lion mothers have often been seen wailing painfully and squealing eerily as they watch their babies being eaten by killer whales. Buffaloes have also been observed sliding playfully across ice, excitedly screaming “Gwaaa.” Emotions are defined broadly as psychological phenomena that help in behavioral management and control. This is a challenging question to researchers who are trying to determine the answer to this question. Through current research by close observation combined with neurobiological research, evidence that animals exhibit fear, joy happiness, shame, embarrassment, resentment, jealousy, rage, anger, love, pleasure, compassion, respect, relief, disgust, sadness, despair, and grief is likely. Charles Darwin said, “The lower animals, like man, manifestly feel pleasure and pain, happiness, and misery.” I agree with Darwin. I believe animals do exhibit emotions, and denying that animals have emotions because the subject cannot be studied directly is not a reasonable explanation.
Throughout studying many myths, I came up with many new observations. Many questions came into my mind about these myths. Greek mythology takes us back to a time when people had a connection with nature and when nature played a major role in people’s lives. The religious beliefs of the people who wrote the myths are found in the background of these myths; however, they are not to be read like religious texts. The myths try to offer explanations of “how”, which makes us think deeply about the purpose of these myths and the questions they draw to our minds. According to the myths we studied in class, the world created the gods, not the other way around. The gods were always created in the image of man, which shows how much men were important in their society. Furthermore, many of these Greek myths show us the difference between the views of the Greek then and our view towards many aspects of the society, including nature. Monsters appear in Greek myths and have different representations and roles. Greek mythology reflects a view of the Greeks towards the world and how certain aspects of their lives are similar and different to modern society.
Animals can be perceived in many different ways. While some humans consider animals to be mindless machines programmed with instinct, others view them as spiritual creatures capable of coherent thought and emotions. I feel that animals are somewhere in the middle. Although they rely heavily on instinct, the ability to feel emotions shows that their mental capacity is not far from that of a human.