Background: Bioterrorism means the deliberate release of highly pathogenic microorganisms or their poisons that leads to the death of human beings, plants, and animals.Materials and Methods: This was a review article conducted using library resources.Results: One way of releasing biological agents among the target population is the deliberate contamination of water and food. Water and food contaminated in bioterrorist activities are not recognizable by organoleptic properties, and in most cases, they emerge silently, suddenly and without apparent changes (color, odor, taste). Water treatment centers, wells used to supply potable water, purified water tanks, storehouses, and the various stages of production, storage and distribution of food in food factories and imported food are the best places to introduce pathogenic agents, and the more rudimentary, non-industrial, and non-sanitary the control systems and mechanisms are more vulnerable to infiltrate and sabotage they become. Given the high resistance of these pathogens to drugs and treatment, the unlikeliness of making rapid diagnoses, the low dosage needed to induce infections, and the absence of vaccines for many of these pathogens, the best method is to prevent the occurrence of such diseases Conclusion: Considering the importance of this issue and its irreparable damage and the great number of enemies that the Islamic Republic of Iran's sacred government has, this article discribes this phenomenon and ways of controlling and preventing it..

The malaria is an infective dangerous disease characterized by shake, fever, and anemias and sometime is reported by hard and deadly effects. The malaria is created by protozoa from plasmodium family. This disease accession is affected by economical, social, and cultural problems especially environmental conditions. For doing this research, monthly climate elements (temperature, relative humidity and precipitation) in Chabahar meteorological station from 2003 to 2008 have been used. The information of Malaria cases was taken during these lengths from Chabahar health center in Sistan and Baluchestan province. The homogenity of time series was tested by run-test and we construedct missing value by auto-correlation. The normal hypothesis was accepted. We used descriptive statistics and correlation for analyzing this data. The findings of research showed that maximum cases of diffusion were at summer with 43%, those which are minimum were at winter with 5% during the year. The Pearson correlation analyses suggest that there were a high positive correlation between the disease cases with temperature average, minimum and maximum temperature averages at alpha level 0.01, minimum relative humidity, and relative humidity average at alpha level 0.05, and a negative correlation with rainfall at alpha level 0.01.

boundary value problems. In general, classical numerical methods fail to produce good approximations for the singular boundary value problems. In this paper, Chebyshev finite difference (ChFD) method and DTM-Pad’e method, which is a combination of differential transform method (DTM) and Pad´e approximant, are applied for solving singular boundary value problems arising in the reaction cum diffusion process in a spherical biocatalyst. ChFD method can be regarded as a non-uniform finite difference scheme and DTM is a numerical method based on the Taylor series expansion, which constructs an analytical solution in the form of a polynomial. The main advantage of DTM is that it can be applied directly to nonlinear ordinary without requiring linearization, discretization or perturbation. Therefore, it is not affected by errors associated to discretization. The results obtained, are in good agreement with those obtained numerically or by optimal homotopy analysis method.