Detection of human papillomavirus DNA in intraosseus ameloblastoma

Human Papillomavirus (HPV) infection has been shown as a risk factor in oral carcinogenesis. The association between HPV and benign and malignant neoplasm of oral mucosa, especially surface epithelium-derived tumors, is well established. The role of HPV in pathogenesis of odontogenic cysts and tumors has been published in few articles. The aim of this study was detection of HPV in Iranian patients with intrabony ameloblastoma and investigation of specific risk factors associated with ameloblastoma. One hundred intrabony ameloblastoma and 50 age-sex matched samples as controls were evaluated by polymerase chain reaction for the detection and typing of HPV. Fisher exact and chi square tests were used to assess the data. HPV DNA was detected in 32% of patients and 10% of controls. HPV-6 was the most prevalent genotype (31.6%) in infected cases. It was followed by HPV-11 (12.5%), HPV-16 (12.5%) and HPV-31 (3.1%). We found a significant association between presence of HPV and location of tumor (p = 0.02), traumatic history (p = 0.03) and ododontic therapy (p = 0.01). These findings indicated that HPV-6 probably is one of the most important etiologic agents in causing intraosseous ameloblastoma in Iranian population. © 2006 Academic Journals Inc., USA

Helicobacter pylori infection is a significant factor risk for hyperhomocysteinemia in the patients with coronary artery disease

This work aimed to determine whether seropositivity to Helicobacter pylori infection was an independent risk factor for hyperhomocysteinemia patients with cardiovascular disease. The H. pylori IgG, IgA and homocystein levels in 96 patients with cardiovascular disease and 64 participants free of cardiovascular disease as control subjects were determined by ELISA assay. The results showed that seropositivity to H. pylori IgG and IgA levels of coronary artery disease (CAD)patients was significantly higher than the controls and CAD patients with H. pylori IgG and IgA negative antibodies. A significant correlation was found between the seropositivity to H. pylori IgG and homocysteine levels of CAD patients in comparison with the controls and CAD patients with seronegativity to H. pylori IgG and IgA (r = 0.233, P = 0.019). The involvement of H. pylori infection in atherosclerosis process was based on the chronic inflammation, which might facilitate the CAD-related pathologies. The effect of the presence of H. pylori infection on homocysteine levels elevation in the CAD patients (as a risk factor independent of other traditional factors) was remarkable

Second Order Perturbations of Flat Dust FLRW Universes with a Cosmological Constant

We summarize recent results concerning the evolution of second order perturbations in flat dust irrotational FLRW models with $\Lambda\ne 0$. We show that asymptotically these perturbations tend to constants in time, in agreement with the cosmic no-hair conjecture. We solve numerically the second order scalar perturbation equation, and very briefly discuss its all time behaviour and some possible implications for the structure formation.Comment: 6 pages, 1 figure. to be published in "Proceedings of the 5th Alexander Friedmann Seminar on Gravitation and Cosmology", Int. Journ. Mod. Phys. A (2002). Macros: ws-ijmpa.cls, ws-p9-75x6-50.cl

Aplikasi Medan Magnet Extremely Low Frequency (Elf) 100µt Dan 300µt Pada Pertumbuhan Tanaman Tomat Ranti

The exposure of Extremely Low Frequency (ELF) magnetic field in the environment is constantly increasing along with the increase of technology which utilize the electrical energy equipment in everyday life. The intensity of ELF magnetic field of 300 μT shows that it can increase the growth rate of Ranti tomato, with the measurement indicators of the number of leaves, plant mass and length of the plant. The purpose of this study is to examine the effects of the ELF magnetic field intensity of 100 μT and 300 μT against the growth process of Ranti tomato, to know the effects of long exposure to ELF magnetic field intensity of 100 μT and 300 μT intermittently for 15 minutes, 30 minutes, 45 minutes and 60 minutes toward the growth of Ranti tomato, and to know at what dose the ELF magnetic fields can accelerate the growth of Ranti tomato. The sample of this study is Ranti tomato seeds. There are nine cups of sample groups consisted of 1 cup of control group, 4 cups of experimental group 100 μT and 4 bowls experimental group 300 μT. These use time variations of intermittent 15 minutes, 30 minutes, 45 minutes and 60 minutes. The results show that the ELF magnetic field intensity of 300 μT with the exposure of 60 minutes have a positive effect on growth process of Ranti tomato. The greater of exposure and the longer of exposure ELF magnetic field make the greater of magnetic field which is generated to change the movement of α-amylase enzyme in germination. Therefore, it can be concluded that exposure of ELF magnetic fields is useful to accelerate the growth of Ranti tomato

Pengaruh Suhu dan Persen Katalis Zeolit terhadap Yield Pirolisis Limbah Plastik Polypropylene (PP)

Increasing population growth leads to increased plastic waste resulting in adverse environmental impacts, If not further processed. This research was conducted to convert plastic waste into fuel oil using synthetic zeolite catalyst. The purpose of this research is to see the influence of temperature variation and percent catalyst / plastic. A total of 100 grams of polypropylene plastic type were crushed in a batch reactor at a temperature of 300 ° C, 350 ° C, and 400 ° C for 60 minutes with percent catalyst / plastic variations 5; 6; 7 (% weight). The highest yield was obtained at 400 ° C with 7% catalyst / plastic percent of 75.69%. While the highest yield without catalyst was obtained at 400 ° C at 65.57%. The product result obtained is density 0,87 gr / ml, kinematic viscosity value 2,140 cSt, flash point value 52 ° C, calorific value 44.673 kJ / kg. The analysis results show that (%) yield of the product meets the diesel (solar) standard

Radiation from the LTB black hole

Does a dynamical black hole embedded in a cosmological FRW background emit Hawking radiation where a globally defined event horizon does not exist? What are the differences to the Schwarzschild black hole? What about the first law of black hole mechanics? We face these questions using the LTB cosmological black hole model recently published. Using the Hamilton-Jacobi and radial null geodesic-methods suitable for dynamical cases, we show that it is the apparent horizon which contributes to the Hawking radiation and not the event horizon. The Hawking temperature is calculated using the two different methods giving the same result. The first law of LTB black hole dynamics and the thermal character of the radiation is also dealt with.Comment: 9 pages, revised version, Europhysics Letter 2012 97 2900

An exact quantification of backreaction in relativistic cosmology

An important open question in cosmology is the degree to which the Friedmann-Lemaitre-Robertson-Walker (FLRW) solutions of Einstein's equations are able to model the large-scale behaviour of the locally inhomogeneous observable universe. We investigate this problem by considering a range of exact n-body solutions of Einstein's constraint equations. These solutions contain discrete masses, and so allow arbitrarily large density contrasts to be modelled. We restrict our study to regularly arranged distributions of masses in topological 3-spheres. This has the benefit of allowing straightforward comparisons to be made with FLRW solutions, as both spacetimes admit a discrete group of symmetries. It also provides a time-symmetric hypersurface at the moment of maximum expansion that allows the constraint equations to be solved exactly. We find that when all the mass in the universe is condensed into a small number of objects (<10) then the amount of backreaction in dust models can be large, with O(1) deviations from the predictions of the corresponding FLRW solutions. When the number of masses is large (>100), however, then our measures of backreaction become small (<1%). This result does not rely on any averaging procedures, which are notoriously hard to define uniquely in general relativity, and so provides (to the best of our knowledge) the first exact and unambiguous demonstration of backreaction in general relativistic cosmological modelling. Discrete models such as these can therefore be used as laboratories to test ideas about backreaction that could be applied in more complicated and realistic settings.Comment: 13 pages, 9 figures. Corrections made to Tables IV and