Grand canonical partition functions for multi level para Fermi systems of any order

A general formula for the grand canonical partition function for a para Fermi system of any order and of any number of levels is derived.Comment: 9 pages, latex, no figure

Dirac Quantization of Open Strings and Noncommutativity in Branes

We apply the Dirac bracket quantization to open strings attached to branes in the presence of background antisymmetric field and recover an inherent noncommutativity in the internal coordinates of the brane.Comment: 25 pp, typos corrected, minor change

Evaluation of Measles, Rubella, Mumps, Hepatitis B and Varicella Zoster Antibodies in Medical and Dental Students in Shiraz, Iran

 Measles, rubella, mumps, hepatitis B virus (HBV) and varicella zoster virus (VZV) cause infectious diseases that can be effectively prevented by vaccination. Vaccination of medical students is important, because they are more likely to become exposed and infected by these viruses. A total of 180 students, consisting of 90 women and 90 men, were serologically screened for measles, rubella and mumps, HBV and VZV antibodies. Their sera were examined for Immunoglobulin G (IgG) antibody against these viruses by using ELISA IgG kits. Total antibody against measles, rubella, mumps, HBV and VZV were 52%, 100%, 76%, 68% and 15% respectively. There was no significant difference in antibodies level according to gender.The results of this study indicate vaccination is vital for medical student prior to hospital training

The Moduli Space of the N=2N=2 Supersymmetric G2G_{2} Yang-Mills Theory

We present the hyper-elliptic curve describing the moduli space of the N=2 supersymmetric Yang-Mills theory with the $G_2$ gauge group. The exact monodromies and the dyon spectrum of the theory are determined. It is verified that the recently proposed solitonic equation is also satisfied by our solution.Comment: Complete set of monodromies are included. To be published in Phys.lett.

An Invariant Action for Noncommutative Gravity in Four-Dimensions

Two main problems face the construction of noncommutative actions for gravity with star products: the complex metric and finding an invariant measure. The only gauge groups that could be used with star products are the unitary groups. I propose an invariant gravitational action in D=4 dimensions based on the constrained gauge group U(2,2) broken to $U(1,1)\times U(1,1).$ No metric is used, thus giving a naturally invariant measure. This action is generalized to the noncommutative case by replacing ordinary products with star products. The four dimensional noncommutative action is studied and the deformed action to first order in deformation parameter is computed.Comment: 11 pages. Paper shortened. Consideration is now limited to gravity in four-dimension

Aspects of Fractional Superstrings

We investigate some issues relating to recently proposed fractional superstring theories with $D_{\rm critical}<10$. Using the factorization approach of Gepner and Qiu, we systematically rederive the partition functions of the $K=4,\, 8,$ and $16$ theories and examine their spacetime supersymmetry. Generalized GSO projection operators for the $K=4$ model are found. Uniqueness of the twist field, $\phi^{K/4}_{K/4}$, as source of spacetime fermions is demonstrated. Last, we derive a linear (rather than quadratic) relationship between the required conformal anomaly and the conformal dimension of the supercurrent ghost.Comment: 36 pages, CALT-68-1756 Revisions to match form to appear in Comm. Math. Phys. Use standard TeX. Derivation of affine partition functions related to $D=4,6$ models is now shown. References Update

DNA Methylation and Histone Acetylation Patterns in Cultured Bovine Adipose Tissue-Derived Stem Cells (BADSCs)

Objective: Many studies have focused on the epigenetic characteristics of donor cells to improve somatic cell nuclear transfer (SCNT). We hypothesized that the epigenetic status and chromatin structure of undifferentiated bovine adipose tissue-derived stem cells (BADSCs) would not remain constant during different passages. The objective of this study was to determine the mRNA expression patterns of DNA methyltransferases (DNMT1, DNMT3a, DNMT3b) and histone deacetyltransferses (HDAC1, HDAC2, HDAC3) in BADSCs. In addition, we compared the measured levels of octamer binding protein-4 expression (OCT4) and acetylation of H3K9 (H3K9ac) in BADSCs cultures and different passages in vitro. Materials and Methods: In this experimental study, subcutaneous fat was obtained from adult cows immediately post-mortem. Relative level of DNMTs and HDACs was examined using quantitative real time polymerase chain reaction (q-PCR), and the level of OCT4 and H3K9ac was analyzed by flow cytometry at passages 3 (P3), 5 (P5) and 7 (P7). Results: The OCT4 protein level was similar at P3 and P5 but a significant decrease in its level was seen at P7. The highest and lowest levels of H3K9ac were observed at P5 and P7, respectively. At P5, the expression of HDACs and DNMTs was significantly decreased. In contrast, a remarkable increase in the expression of DNMTs was observed at P7. Conclusion: Our data demonstrated that the epigenetic status of BADSCs was variable during culture. The P5 cells showed the highest level of stemness and multipotency and the lowest level of chromatin compaction. Therefore, we suggest that P5 cells may be more efficient for SCNT compared with other passages

Can We Have Exact Supersymmetry With Undetected Superpartners? Lessons From 2+1 Dimensions

Introduction It has been known for sometime that supergravity theories in 2+1 dimensions can be formulated as Chern Simons gauge theories of the corresponding supergroups [1-4]. The main focus of the present work is to explore the physical properties of the emerging space-time when supersymmetric matter is coupled to these theories in a super Poincar&apos;e gauge invariant manner. We will approach this problem in the same manner as that employed in coupling matter to Poincar&apos;e Chern Simons gravity in a Poincar&apos;e gauge invariant manner and studying its consequences. One of the important features of this approach is that the concept of space-time is not a fundamental input but an output of this gauge theory. Although much of what we describe is applicable to any supergravity theory, for definiteness we will consider the N = 2 Chern Simons gauge theory of the super Poincar&apos;e group. It has been pointed out recently that the two-superbody problem in N =

Areal location of hazardous atmospheres simulation on toxic chemical release: A scenario-based case study from Ray, Iran

Background and aim: Chemical accidents cause significant danger for residents living close to chemical facilities. For this reason, this study assessed the impacts of a simulated chemical accident on surrounding residents in the city of Ray, Iran. Methods: In this scenario-based case study in 2015, the Areal Location of Hazardous Atmospheres (ALOHA) model was applied to simulate a toxic chemical release from a chlorine warehouse in Shourabad, Ray, Iran. The population of the area was calculated based on the latest census in Iran, 2011. The atmospheric variables included were wind speed, air temperature, and relative humidity. We also included data on pollution source such as diameter, length and volume, and condition of chemicals. The simulation was repeated for each seasonal period. The simulated threat zones were mapped using Geographical Information System. The percentage of residents sustaining injuries and death was calculated using probit. Results: The maximum and minimum simulated threat zones by chlorine release are during summer and winter at 8.8 and 6.4 kilometers respectively. The total affected population was estimated at approximately 30,000 people. The greater percent of injuries and death was estimated to occur in the winter and autumn, compared to summer and spring, because of greater climatic instability. The number of individuals affected by chlorine release in the spring, summer, autumn and winter at 8.3, 8.8, 7.6 and 6.4 kilometers, are estimated at 22,500, 25,000, 28,100 and 27,500, respectively. Populations located in hot and warm zones of toxic chemical releases should have access to medical resources. Conclusions: The results showed that relevant factors impact human vulnerability, and these should be examined to mitigate the harmful consequences of chemical accidents. Establishing a multi-level Emergency Response Program is also recommended in the area under stud