Critical Analysis Essay Example | Topics and Well Written Essays - 750 words - 6

Critical Analysis - Essay Example In this paper, the authors report on the effects of PDNF on tyrosine hydroxylase (TH) activity, a rate-limiting enzyme during the synthesis of dopamine and other catecholamine neurotransmitters. TH is important because it is involved in increasing the production of neurotransmitters. The study came up with the following additional actions of PDNF: Strengths. The paper has many strengths. First, it presented data that was based on solid experimentation that covered a wide range of immunological, molecular, and imaging techniques. The data was clearly presented using graphs and images. The discussion was straightforward and concise. The strongest point of the study is the methodology followed to arrive at the results. The authors arrived at their results through a series of experiments that each showed the action of PDNF on TH. To show that PDNF increased the TH expression in PC12 cells and primary mesencephalic neurons, the authors grew the cells in media that was treated several times with PDNF. Results obtained with immunostains were confirmed using immunoblots. Western blots and SDS-PAGE were also utilized. The study also used a luciferase gene assay to check the effect of PDNF on the promoter of TH. The method used to confirm the mechanism of action of PDNF on TH was done in a simple manner, where a construct of a mutation for the cAMP response element (CRE) labelled with luciferase transfected to PC12 cells. This step was able to show the effect of CRE on the action of PDNF on TH promoter activity. The discussion portion was able to summarize in a clear manner the results of the experiments, and related these to previous work done in the field of TH activation. The paper points to the mechanisms that could explain the action of PDNF. As an example, it was pointed out that PDNF mediated the phosphorylation of serine residues in the catalytic sites of TH. The phosphorylation activity of PDNF was

Engineering Essay Example | Topics and Well Written Essays - 250 words - 1

Engineering - Essay Example The design goals included; employment of a set of special green concrete mixes that set forth at most seventy percent cement substituting materials while meeting the recommendable requirements. At the same time, the concrete’s delaying set-time is not compromised. It was thus necessary for the associated carbon emissions from the concrete per cubic yard to be reduced, a requirement the concrete supplier had to fulfill. The building’s uniqueness is also drawn from the test to which the mix designs for the concrete were put at commencement of the construction. Concrete, estimated at five thousand cubic yards was utilized in placing the mat foundation, employing a mix in which seventy percent is cement substituted material with the recommended strength being eight thousand psi. These specifications were the same requirements adopted for the columns of the building as well as shear walls. The experts came up with a unique mix design for elevated slabs in order to meet certain light reflectance capacity. It is imperative to note that, also uniqueness is achieved by the reduced height of the concrete floor-to-floor which allowed for the addition of an extra floor to the initial set twelve floors. The sun blocking beams were as well eliminated by the structure. The latter designs culminated in half of carbon dioxide reductions. In conclusion, it is noteworthy to say that adoption of the flexible reinforcing concrete design for the structure achieved cost, environmental and structural advantages. The cost was tremendously cut down and the carbon footprint significantly reduced making the structure a high-performance green solutions