Polycyclic aromatic hydrocarbons (PAHs) are classified as hazardous pollutants in the environment due to their toxic, mutagenic and recalcitrant nature. Compared to other methods, biodegradation using microorganisms seems to be attractive alternative for treating PAH contaminated environment. However, there are limitations because of its low aqueous solubility and negligible bioavailability to ...

INTRODUCTION Probiotics are beneficial microorganisms. When ingested on a regular basis, probiotics can improve overall health, balance the microflora of the intestinal tract, enhance immune system function, and assist in the absorption of vitamins and minerals [1]. The most commonly consumed probiotics are lactic acid bacteria (LAB) including Lactobacillus acidophilus, Lactobacillus plantarum ...

Biofuel is considered one of the most viable alternatives to fossil fuels derived from dwindling petroleum resources that damage environment. Bioethanol could be manufactured agricultural wastes, thus providing inexpensive natural resources. Several strategies have been utilized convert lignocellulosic hydrolysate bioethanol with various suspended microorganisms. In this study, we alternatively...

ADP-glucose pyrophosphorylase (AGPase) regulates starch biosynthesis in higher plants and microalgae. This study measured the effect of the bacterium Azospirillum brasilense on AGPase activity in the freshwater microalga Chlorella vulgaris and formation of starch. This was done by immobilizing both microorganisms in alginate beads, either replete with or deprived of nitrogen or phosphorus and a...

The present study aimed to the batch production of CGTase (cyclomaltodextrin-glucanotransferase) with Bacillus firmus strain 37 free and immobilized in bovine bone charcoal mode a fluidized bed reactor, respectively. is an innovative support material for immobilization microorganisms’ producers enzymes use this microbial allows its reuse significant cost reduction process. fermentation cells wa...

Microbubbles coupling fermentation is an efficient technology for improving oxygen transfer to aerobic microorganisms in a bioreactor containing air sparger. However, the effect of this on anaerobic Clostridium tyrobutyricum, whose morphology develops viscous broth rheology and lumps impeding nutrient mass transfer, has not been reported yet. Therefore, we evaluated role microbubbles fibrous-be...

proteases are important enzymes that their role in various industries is undeniable. however, keeping enzymes stable during its activity in harsh conditions is so important. in this study, protease enzyme was immobilized on the porous silica particles and its stability in different temperatures and phs was evaluated. first silica particles were aminated by 3-aminopropyltriethoxysilane then the ...

To help us understand the factors and mechanisms implicated in the death of microorganisms or their resistance to temperature in a low water activity environment, microorganisms were dried on the surface of glass beads before being subjected to high temperatures for a short period followed by rapid cooling. Two microorganisms were studied: the yeast Saccharomyces cerevisiae and the bacterium La...