Phloem and Principal Water-conducting Elements

Exercise 4 (Histology) 1. 1 Give at least three distinguishing features of these groups of cells. Apical meristems have the following features: (1) a â€Å"border† of cells; (2) they follow order or shape; and (3) some cells are darker (indicating that they undergo mitosis). 2. 1 Identify the tissue. The tissue is a vascular cambium. 4. 5 (? ) Is the epidermis uniseriate or multiseriate? In the cross section of a young root of Helianthus, the epidermis is uniseriate. 6. 1 What do you call the outgrowths of the epidermis? These are called trichomes. 6. 2 What is their function? They function mainly for support and protection of the leaf or stem which contains the epidermis. 6. 3 Classify the types of epidermal outgrowths in the above plants. bristle| scale| simple hair| glandular| branching| stellate| 7. 1 Draw and identify the tracheary elements. reticulate| annular| pitted| scalariform| helical| 8. 1 Differentiate the sieve tubes from the companion cells. The sieve tubes in the phloem are composed of long, narrow cells which lack a nucleus, ribosomes, and some other cellular components; they transport sugars and other organic nutrients. Companion cells have nuclei and ribosomes that also serve the sieve-tube cells but do not themselves take part in conduction. 8. 2 What are the principal water-conducting elements of the xylem? The two principal water-conducting elements of the xylem are the tracheids and the vessel elements. 9. (Table 4. 1) Specimen| Tissue| Cell Types| Characteristic(s)| Function(s)| Cassava pith| | | | | Tomato fruit pulp| | | | | Spanish flag petiole| | | | | Lotus peduncle| | | | | Celery petiole| | | | | Coleus petiole| | | | | Mung bean seed coat| | | | | Peanut pericarp| | | | | Pineapple leaf| | | | | Others| | | | |

The Effect TV Has on Children Essay Example | Topics and Well Written Essays - 500 words

The Effect TV Has on Children - Essay Example According to the American Academy of Pediatrics (AAP), kids in the United States watch about 4 hours of TV a day. According to the AAP guidelines, children under age 2 should have no "screen time" (TV, DVDs or videotapes, computers, or video games) at all. During the first 2 years, a critical time for brain development, TV can get in the way of exploring, learning, and spending time interacting and playing with parents and others, which help young children, develop the skills they need to grow cognitively, physically, socially, and emotionally. There is no doubt that TV can be an excellent educator and entertainer. But despite its advantages, too much television can be detrimental. Several types of research around the world have shown that children who consistently spend more than 4 hours per day watching TV are more likely to be overweight. In earlier days before the television, children played outdoors more and used their minds to be more creative. Excessive television viewing promotes inactivity. Health experts have long linked excessive TV-watching to obesity - a significant health problem today. While watching TV, children are inactive and tend to snack which contributes to poor nutrition. They're also bombarded with advertising messages that encourage them to eat unhealthy foods such as potato chips and empty-calorie soft drinks that often become preferred snack foods. According to the AAP, children in the United States see 40,000 commercials each year. From junk food and soft drink advertisements, children persuade t heir parents to buy them. This leads to major health problems and is a serious concern around the world (Dowshen and Gavin, 2005).     

The History of Suture Essay Example | Topics and Well Written Essays - 1000 words

The History of Suture - Essay Example After World War II (1939-1945), the greatest developments in wound suturing began with the introduction of advanced, partly automatic stapler machinery, as well as the manufacture of synthetic non-resorbable and resorbable fibres. These revolutionary techniques fuelled the development of new fields such as microsurgery (Kuijjer, 1998). Thesis Statement: The purpose of this paper is to investigate the history of suture including advances in suturing techniques and the evolution of suturing materials. The History of Suture The history of surgery is inextricably linked with the history of suturing, or stitching together two surfaces or edges. Allusion to sutures and the suturing of wounds in an ancient Egyptian scroll (circa 3,500 BC) is considered as the oldest existing surgical treatise. The term suture means to sew, which Hippocrates used in 400 BC. About 1000 years before Christ, the Indian medical book Charaka’s Samhita described many techniques of suturing including the clo sing of wounds by ant pincers in bowel surgery. Once the large black ants with powerful jaws clamped the edges of the wound together with their pincers, their bodies were twisted off (Snyder, 1976). In 600 BC the ancient Indian surgeon Sushruta’s medical treatise is a compilation of plastic surgery and opthalmology which mentions sutures made from animal sinews, braided horsehair, leather strips, cotton and fibers made from the bark of the ashniantaka tree. From 100 BC Egyptian mummies have shown evidence of sutured wounds. Further, in 100 BC, a learned Roman, Cornelius Celsus used the word suture both as a noun and as a verb: to suture; â€Å"he also named the skull sutures coronal, sagittal, and lambdoidal† (Snyder, 1976, p.401). By 30 AD, the Roman Celsus again described the use of sutures and clips, and in 150 AD, Galen used silk and catgut, and explained their use as sutures (Galli, 2011). Soon sutures were used to tie off tissues, through a process called ligatur e. In 165 AD, Galen who was physician to the Roman gladiators recommended their use for their wounds, to prevent paralysis. In 1555, Ambroise Pare, the French military surgeon changed his treatment of bleeding vessels caused by amputation, from hot irons and boiling oils to ligation. He also introduced the use of stitched linen adhesives to close saber wounds and to prevent scar formation. Also among the early advocates of suturing all fresh wounds as well as severed tendons and tissue was Andreas Vesalius, the greatest anatomist of the Renaissance (Snyder, 1976). The history of sutures which began more than 2000 years ago correlates with the first records of eyed needles. Before the end of the first millennium, Avicenna used monofilament with pig bristles in infected wounds. Surgical and suture techniques advanced significantly in the late 1800s, with the development of sterilization procedures. Subsequently, modern methods created uniformly sized sutures (Galli, 2011). The Evoluti on of Suturing Materials According to Mackenzie (1973), the term sutures includes those which hold a wound together until it has healed, as well as ligatures used to tie off a blood vessel such as an artery. Between 50,000 and 30,000 BC, eyed needles were invented and used for suturing. From

Internet Connectivity Research Paper Example | Topics and Well Written Essays - 1750 words

Internet Connectivity - Research Paper Example High speed internet connectivity has greatly improved various areas (Huske, Protheroe, and Shellard, 2001). Consider the following rewards to investing in broadband internet: Waiting for pages to load is annoying. With broadband internet, pages load faster than average speed and require less page reloading. With high speed internet connection, people can browse the internet with many tabs open even with video and photos present on various pages. With broadband internet, one can stream media without interruptions. Streaming movies, music, and television shows is becoming increasingly popular and interruptions can be annoying especially when reloading a page requires more than just troubleshooting. Connections can be extremely slow if there is more than one person in a particular household using the internet at the same time. This is a major setback of the dial-up speeds internet connection. Broadband internet allows multiple users to access the internet at the same time that is; multiple users can access and utilize the internet concurrently without a hitch in connection (Vacca, 2001). To keep up with the technology of the future, you need to catch up with the technology of the present. Internet connectivity is, and will be, a necessity and there are various methods of being connected so as to be able to access and utilize the internet. Digital Subscriber Lines/Loop refers to a family of digital telecommunications protocols that allow high speed data communication over the existing telephone lines between end-users and telephone companies. DSL service is an umbrella of a number of different technologies. The most commonly installed DSL technology is the Asymmetric Digital Subscriber Line (ASDL). DSL uses higher frequency bands for data and this is the reason why the DSL service is delivered simultaneously with wired telephone service on the same telephone line. DSL requires a modem that is responsible for splitting transmissions into two frequency bands

See below Essay Example | Topics and Well Written Essays - 500 words - 8

See below - Essay Example It discusses the behaviors portrayed by the corporation. It also discusses and gives suggestions to the ways the corporation has to do to the environment. And finally, the essay gives the most important considerations a corporation has to consider. Having a strong desire for more wealth, possessions and power more than a person’s needs can lead to a person to do things that will harm other people just to satisfy that desire. Being greedy can lead a person to do actions such as sacrificing the safety, happiness and the rights of other people for the sake of satisfying one’s self. Monsanto is a big business that can be found all around the world. It is a corporation that has existed in the year 1901. A 42-year-old, John F. Queeny, whose job is to purchase under the Drug Company of the Meyer brothers started this business. The name was taken from the last name of his wife for the reason that the last name of his wife is well known to other people especially to the Germans that are responsible in supplying goods. During that time, they named their companies using their last names. They had been discovering and manufacturing products in connection to the farms and cattle for fast production that leads them to higher profits. From the very beginning, Monsanto Corporation has been claiming that their main purpose is for the sake of the farmers and for the environment. Their main goal is to help the farmers in every possible way in order to produce more crops. One of their goals is to use as little of the resources such as the soil and water as possible so that these resources will last a long time. But the corporation is the number one violators of their goals. They did the opposite for the sake of higher profits. They torture the farmers for the sake of profits by suing them to court and asked them large amount of money. The amount of money that both parties agreed to pay is not revealed to the public which means that the corporation is only

Mumbais Dabawalahs - A World Class Service Coursework - 1

Mumbais Dabawalahs - A World Class Service - Coursework Example As Annie Leonard has pointed out in her ‘The Story of Stuff’ (2007), 51 percent of the world’s largest economies are those of corporations (Leonard, 3). The case study of the Mumbai Dabawalah’s tiffin delivery service is an excellent example of human endeavour in action. Achieving accurate and fast delivery to over 200,000 hungry office workers every day is no small feat- and that too in an extremely fast turnaround time of twenty seconds of stoppage by the trains-to collection and reversal of the entire process after the lunch break, to reach the dabba home before the worker arrives at the end of the day- is nothing short of phenomenal. With just a code to guide them, the delivery is as unerring as Six Sigma or one defect in a million deliveries (Mullins, 326). When it comes to a question of how to attract and retain the best staff, we have to look at the various theories of motivation proposed by different thinkers and writers over the ages. In ancient times, management used the carrot and stick approach or what McGregor calls Theory X and Theory Y (McGregor, 1960) to get the desired results within the organization-some firms still do. Motivation is anything that induces one to perform or do something. Most basic of these is Abraham Maslow’s Hierarchy of Needs Theory, in which he has defined human needs as being in a ladder or hierarchy from the lowest to the highest points- or from the basic physiological needs of food, clothing and shelter to the higher needs for safety and security, further to esteem needs and ending at the point of self actualization needs, where man has achieved his life purpose through his actions and work (Mullins, 257). Very few of us are fortunate enough to realize this in our lifetimes. Herzberg gives his Two Factor or Hygiene Theory (Mullins, 261) as an explanation on how and what motivates workers based on an actual field experiment that he conducted. He concluded that there were a group of satisfiers and dissatisfiers in every work environment- which could be anything from strict and unyielding work policies or the lack of management attention to the needs of the workers on the negative side, to a fair and equitable wage and hygienic conditions that took into account the health and safety of the workers on the positive side.

Lethal v. Non lethal weapons Research Paper Example | Topics and Well Written Essays - 5000 words

Lethal v. Non lethal weapons - Research Paper Example ra, weapons have not only failed to strengthen a nation’s position while dealing with such difficulties but suggest that it is too prudish to inflict any severe damage to enemies or accept casualties. This has given rise to legal challenge against the use of force which has given rise to unsympathetic propaganda. Lethal weapons are developed with increasing precision and lethality due to the rise of a global defense industry worth a multibillion-dollar. Justice against crime has become a matter of serious concern for the first world country as the fight back the use of lethal weapons to introduce non-lethal weapons such as â€Å"acoustic (bioeffects), chemical (pepper spray), electrical (stun devices and projectiles), kinetic energy projectiles (shot bags and ring airfoil projectiles), light (lasers, flashing bright lights), nets (baton launched, projectile launched), and fleeing vehicle interdiction (mechanical and electric/electromagnetic)† (Morehouse 1996). If non-le thal weapons are not considered secure then there seems no difference between the use of lethal weapons. But one might agree that there may be lesser damage caused to environment at large. If the defense industry continues to produce weapons on large scale spending billions and billions of dollars, then the humanity will have to look for other solutions to protect mankind against crime. Today many nations’ chief exports are weapons technology for both defense as well as offense. Many critics have suggested that the business of conventional weaponry should be re-channelized for a worthy cause. Educated people need to realize that in order to evolve into better specie one needs to move on a higher plane. It is for this reason that the non-lethal weapons technology and its application started to evolve. Consequently non-lethal weapons and technologies are defined according to their potential application at the tactical and strategic level (Morehouse 1996). The question which often