Cyanobacteria have a strong potential for biofuel production due to their ability to accumulate large amounts of carbohydrates. Nitrogen (N) stress can be used to increase the content of carbohydrates in the biomass, but it is expected to reduce biomass productivity. To study this trade-off between carbohydrate accumulation and biomass productivity, we characterized the biomass productivity, bi...

INTRODUCTION Sustained energy intake (SusEI) is the maximal rate of energy intake that animals can sustain over sufficiently long periods so that energy demands are fuelled by food intake rather than by transient depletion of energy reserves (Speakman and Krol, 2005). In many situations, the SusEI may be constrained. The factors causing these constraints on SusEI are important because they esta...

The effect of growth rate on the rate of glucose utilization has been examined with a sporogenic and a weakly sporogenic strain of Bacillus subtilis by means of the continuous culture technique. Cultures were grown aerobically on a mineral salts medium with glucose as the carbon and energy source. During both nitrogen and l-tryptophan limitation, the rate of glucose consumption (milligrams of g...

Due to the limitation of energy resources, energy efficiency is a key issue in wireless sensor networks (WSNs). Clustering is proved to be an important way to realize hierarchical topology control, which can improve the scalability and prolong the lifetime of wireless sensor networks. In this paper, an energy-driven unequal clustering protocol (EDUC) for heterogeneous wireless sensor networks i...

A wireless sensor network is the version of adhoc networks consisting nodes with less energy power fitted with a radio transceiver. The primary constraint of a sensor node is its energy resource limitation in the form of a short battery lifetime. Energy is the critical problem while we design the algorithm for wireless sensor networks to maximize the network lifetime. Hence we have to design th...

evidence provided from studies in iran points to a possible bias in application of the standard epi cluster sampling procedure, when carried out in populations with highly variant birth rates, tends to over-represent the low birth rate, i.e. higher socio-economic, strata, and if the entity under study shows significant socio-economic gradient, then the estimates arrived at by this method might ...

Traditional fossil fuels lead to environmental problems and are also depleting. A significant portion of global energy consumption is due to building’s air conditioning. Nowadays there is a great attention toward renewable and sustainable energy sources to support the buildings energy requirements. In this study, a solar cooling machine was designed for a three-floor residential building under ...