Radiation
Essays

The concept of aging has many intrinsic and extrinsic factors that act as markers on an individual organism. Ignoring mortality associated with external environmental factors, very few organisms can be said to have cellular immortality with no decrease in cellular function or repeat division in normal diploid cells. Cellular senescence is a normal process that halts cellular division after a set of cycles of replication. Senescent cells can remain completely functional but lose the programmed process of replication. The normal pathway for senescent cells is either aging with metabolic pathways continuing for the cell or programmed cell death which is known as apoptosis that occurs when cellular function changes, a specific lifetime is reached for the cell or the cell is damaged. The multicellular cnidarians known as a Hydra has been shown to have a complete lack of senescence in cellular function with cells dividing frequently and continuously and being sloughed off at the tips of appendages and new stem cells continuously repopulating (Watanabe 2009). The hydra organism effectively shows no aging (Martinez 1998) and studies of the Hydra genome show that the organism has a mutation in the expression of the p53 gene that manifests as a lack of p53 protein in hydra cells (Rutkowski 2010). The link between a lack of p53 expression and aging has been studied exhaustively with the inverse relationship between tumor suppression and cell immortality at balance with the expression of the protein. What has not been studied under such significant scrutiny has been the relationship between p53 expression and cellular senescence which is the halting of cellular processes to form a dormant cell. The tradeoff for having no pathway to halt cellular activity is continuous cell division and replenishment which the hydra has exploited to live an immortal life. For a more complex animal with differentiated organ systems the nature of p53 tumor suppression and "immortality" is a legitimate tradeoff between insuring that cancer cells become dormant and undergo apoptosis (programmed cell death) and renewing the organ systems of the body.

As has been demonstrated in this study there are both manual and machinated methods used in signature analysis in the field of forensics. The proficiency of manual signature analysis has developed a methodology for checking the expertise of forensic examiners. There are many questions and considerations in conducting a signature analysis and this work too brief to be all inclusive in the techniques available today for use in forensic signature analysis.

¶ … Boss Has Cancer" written by Joann Lublin discusses different cases and conditions that result when senior level employees suffer from cancer. The article explains in detail the positive and negative sides of…

Breast cancer is the most common cause of cancer related deaths in females and its rising incidence makes it the second most common cause of deaths due to cancer in both genders. Its incidence increases with the…

When people hear the term "plastic surgery," they almost immediately think of the negative connotations of that phrase. While it is certainly true that many Americans have had elective plastic surgery, there are far…

This paper talks about how mobile computing has changed healthcare and also it advantages and disadvantages. It also discusses the increase of mobile systems and the extensive adoption of the cell phone mean that mobile applications are a rapidly and exciting increasing area for such applications. Research shows that vital signs include the temperature, breathing rate, heart beat, and blood pressure.

The objective of this study is to examine methods of controlling agents that cause disease, communicable disease control, wastewater treatment, swimming pool guidelines, solid waste management insect and rodent control, radiation control and environmental management. Towards this end, this study conducts a review of literature in this area of inquiry.

Imaging with a radionucleotide requires a high degree of specificity for the target molecule at the receptor site or non-targeted tissue will exhibit uptake. The synthetic somatostatin analogue and chelating agent complexed to short peptide, DOTA-TOC [N-(4,7,10-(tris(carboxymethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetyl-D-Phe-c[Cys-D-Tyr-Trp-Lys- Thr-Cys]-Thr(ol))] has been developed as a molecule that both targets the overexpressed receptors and allows rapid and strong chelation to the radio nucleotide 68Ga. DOTA or 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid is a cyclic polydentate chelating ligand with four secondary amine groups and four acetic acid pendants. The molecule can be linked to phenylalanine-tyrosine and then a short peptide where it behaves as a strong somatostatin analogue showing preferential binding to somatostatin receptors. The resulting molecule has a strong binding site for several transition metals including Gallium (Ga3+). The radionucleotide, 68Ga, has been shown to act as a high contrast agent in positron emission tomography (PET) scans while allowing formation with a conventional nuclear formation rather than more expensive cyclotron formatio

Chernobyl Nuclear disaster took place in 1986 in Ukraine which is a former Soviet State. The United Soviet Socialist Republic thought they would solve the problem until 1989 when they asked World Health Organization to come to their aid. They also asked the International Atomic Energy Association (IAEA) to assess the consequences of health and environmental terms Everyone living in the city of Pripyat where the disaster had occurred had to move due to the deteriorating conditions in the region. The red-Cross has always been available in times of need too.International laws and polices that impacted international organizations' response and recovery efforts to the Chernobyl disaster the response showed some deficiencies and gaps. Lessons on emergency response should be given to the society so that they can also take necessary precautions during emergencies. Recommendations should also be given in future when dealing with such international disasters.

Sculptures and paintings depicting American Indians in the 19th Century followed certain predictable themes and patterns, particularly the idea of the destruction and disappearance of a supposedly inferior race by the Western march of white civilization. Two sculptures that once decorated the Capitol, Horatio Greenough's The Rescue and Luigi Persico's Discovery of America, both commissioned by the government in 1836, were so explicitly racist that Congress finally removed them in 1958 after years of protests by Native Americans.