96 Essays - Organelles

Essay of Eukaryotic Organelles 10/1/96 Essays - Organelles Essay of Eukaryotic Organelles 10/1/96 The mitochondria has an eggshape structure. The mitochondria consists of an inner and outer membrane. The outer membrane is what shapes the organelle to its egglike shape. The inner membrane which folds inward makes a set of "shelves" or cristae that allow the reactions of the mitochondria to take place. The more the mitochondria makes these reactions the more the inner membrane folds. This happens because the mitochondria now has more surface area connecting it to its surroundings. The processes that the mitochondria make are to break down the high energy organic molecules into smaller more useful packages. The endoplasmic reticulum is a network of tubes and channels that transport and with the help of ribosomes produce proteins. The rough endoplasmic reticulum contains ribosomes which are not present in the smooth endoplasmic reticulum. The rough endoplasmic reticulum allows the cell to produce proteins. The smooth endoplasmic reticulum is used in the detoxification processes in the cell and the transitional endoplasmic reticulum is used to breakdown glycogen to glucose. The endoplasmic reticulum is versatile and grows and shrinks according to the cell's activities. Chloroplasts which are found in plant cells are used in the process of photosynthesis. They fall into the category of plastids but they are differentiated in that they contain chlorophyll. These organelles produce chemical reactions from the energy that the sun gives them. The Golgi complex's structure is made up of many flattened membranes sacs that are surrounded by tubules or vesicles. These are called the cisternae. The golgi complex accepts vesicles from the endoplasmic reticulum and modifies them for usage in the cell. The golgi complex is used to distribute materials which help form the cell membranes. They also assemble the membranous material by producing glycolipids and glycoproteins. The golgi complexes also hand their vesicles materials for secretion. The golgi complex could not do its job without the help of vesicles. Vesicles bring and send the organelle its materials.

Free Essays on Network Analysis

Network Analysis pg. 1 The success of virtually all organizations in business, government, and defense is dependent on the availability and correct functioning of large-scale networked information systems. Because of the severe consequences of failure, organizations are focusing on system survivability as a key risk management step. Survivability is the capability of a system to fulfill its mission in a timely manner, even in the presence of attacks or failures. Survivability goes beyond security and fault tolerance to focus on delivery of essential services even when systems are penetrated or experience failures and rapid recovery of full services when conditions improve. Unlike traditional security measures that require central control and administration, survivability addresses highly distributed network environments that lack central control and unified security policies. The focus of survivability is on delivery of essential services and preservation of essential assets. Essential services and assets are those system capabilities that are critical to fulfilling mission objectives. Survivability depends on three key capabilities, resistance, recognition, and recovery. Resistance is the capability of a system to repel attacks. Recognition is the capability to detect attacks as they occur and to evaluate the extent of damage and compromise. Recovery, a hallmark of survivability, is the capability to maintain essential services and assets during attack, limit the extent of damage, and restore full services following attack. The Network Analysis method is a practical engineering process that permits systematic assessment of the survivability properties of proposed systems, existing systems, and modifications to existing systems. The analysis is carried out at the architecture level by a team of system architects, developers. The method proceeds through a series of joint working sessions, culminating in a briefing on findings and... Free Essays on Network Analysis Free Essays on Network Analysis Network Analysis pg. 1 The success of virtually all organizations in business, government, and defense is dependent on the availability and correct functioning of large-scale networked information systems. Because of the severe consequences of failure, organizations are focusing on system survivability as a key risk management step. Survivability is the capability of a system to fulfill its mission in a timely manner, even in the presence of attacks or failures. Survivability goes beyond security and fault tolerance to focus on delivery of essential services even when systems are penetrated or experience failures and rapid recovery of full services when conditions improve. Unlike traditional security measures that require central control and administration, survivability addresses highly distributed network environments that lack central control and unified security policies. The focus of survivability is on delivery of essential services and preservation of essential assets. Essential services and assets are those system capabilities that are critical to fulfilling mission objectives. Survivability depends on three key capabilities, resistance, recognition, and recovery. Resistance is the capability of a system to repel attacks. Recognition is the capability to detect attacks as they occur and to evaluate the extent of damage and compromise. Recovery, a hallmark of survivability, is the capability to maintain essential services and assets during attack, limit the extent of damage, and restore full services following attack. The Network Analysis method is a practical engineering process that permits systematic assessment of the survivability properties of proposed systems, existing systems, and modifications to existing systems. The analysis is carried out at the architecture level by a team of system architects, developers. The method proceeds through a series of joint working sessions, culminating in a briefing on findings and...

Human Computer Interaction Essay Example | Topics and Well Written Essays - 2000 words

Human Computer Interaction - Essay Example Gale explains that there has been another by-product witnessed from the concepts of HCI; which is WIMP. It stands for "window, icon, menu, pointing device", it is a mode of interacting with the computer just like GUI. It was developed by Merzouga Wilberts in 1980. The basic concept behind this form of interaction is to use a physical input device that controls the placing of a cursor. The exchange of information between the user and the computer takes place from a pointing device (usually a mouse). The information is presented in windows and icons. The pointing device enables the users to select an icon or any document present on the display screen.  2. Future of HCI  The future of HCI holds very promising developments, a glimpse of such revolutions is stated below:2.1 Multi-touch InterfacesThere has been some revolutionary developments in the area of user interfaces that have allowed man to use computers in very diverse techniques. Ted (2007) states that one such example is the ‘multi-touch user interfaces’, the concept of this interfacing started in the 1980s. Touch interfaces have been very common but the innovative thing about these interfaces is that it enables multi-touch by multiple users. This multi-user facility proves to be very useful for scenarios where many people want to interact at the same time such as interactive walls and tabletops. There are a number of possibilities with this concept and a complete shift can be witnessed in HCI if this is pursued to its maximum potential.tential.