Review article Example | Topics and Well Written Essays - 250 words - 15

Review - Article Example Thain, Hall and Miller (951) thus investigated the rhythmic expression of a particular gene using a bioluminescent luciferase reporter gene. For this purpose, three promoters (PHYB, CHS and CAB) in a transgenic Arabidopsis plant were monitored in the presence of light/dark treatments to specific tissue areas. The study showed that plants have circadian clocks spaced throughout them. These clocks are autonomous and are not controlled by a localized pace maker, unlike animals. These regulate the gene expression in plants. The independent circadian rhythms are synchronized by independent and simultaneous entrainment of the clocks. The circadian system is less accurate but highly flexible. One question that this paper might raise is the significance of autonomy of the localized circadian clocks. How the organism is able to be regulated as a whole might be the subject of future study. Another question that is raised by this study is what advantage (evolutionary or functional advantage) does the more flexible yet less accurate circadian timing provide to the

Systems And Analysis and Design Case Study Example | Topics and Well Written Essays - 750 words

Systems And Analysis and Design - Case Study Example The next step is to merge the pairs of state-transitions into fragments as well as to put up a state machine diagram together with the states in the right succession. Step four entails looking for simultaneous paths. The last step seeks for extra transitions (Satzinger, Jackson & Burd, 2012). The UML diagram employed to indicate the states and transitions of an object is the state machine diagram. It can be made for any problem domain classes with intricate behavior or for keeping track of status conditions (Satzinger, Jackson & Burd, 2012). The guard-condition is a test or qualifier on the transition and it is a true/false condition that should be satisfied prior to the transition firing. In order for a transition to fire, the trigger must take place, and the guard has to estimate to true (Satzinger, Jackson & Burd, 2012). The domain model class diagram is a particular case. The domain model is essential to recognize all the domain classes needed in the new system. The domain representation is as well used in designing the database. The domain model class diagram and the use case diagram are the major models out of which others get information. The internal descriptions like preconditions, as well as post conditions in these domains, make use of information in the class diagram. These comprehensive depictions are also imperative for making the system sequence diagrams. Consequently, the activity diagrams, in depth descriptions and system sequence diagrams should all be constant regarding the steps of a given use case (Satzinger, Jackson & Burd, 2012). Architectural design is an extensive design of the overall system structure. It is also known as conceptual design or general design. On the other hand, Detail design is a low-level design that entails the design of the explicit program details (Satzinger, Jackson & Burd, 2012). The domain model; generated during systems analysis, is used to