فهرست مطالب گلنوش رضایی زاده

Brucellosis is a common disease between humans and animals with global distribution and an increasing trend. The control of brucellosis in humans depends on the control of the animal disease. Although there is no approved vaccine for brucellosis in humans, many efforts have been made to develop vaccines with high efficiency and low side effects for animals. Live attenuated vaccines are cheaper and more effective than other vaccines, but they can increase antibiotic resistance, interfere with serological diagnostic tests, and increase virulence in animals. Vaccination of animals with commercially available vaccines may cause disease and, in some cases, have low efficacy.  Vaccines containing recombinant protein or their coding DNA can be suitable alternatives to the conventional vaccines, because they can reduce unwanted side effects. Choosing the suitable antigen that stimulates the immune system is very important in the preparation of these vaccines. In the present study, by observing the new recombinant vaccines that are made based on recombinant proteins and DNA, it has been tried to clarify their strengths and weaknesses and the new perspective of vaccination against brucellosis. There is currently no approved vaccine for brucellosis in humans. In addition, the control of brucellosis in humans depends on the control of the animal disease. This review article searches Google scholar, PubMed, and SID databases for new research on recombinant protein and DNA vaccines against brucellosis until 2021. Considering the advantages and disadvantages of common and new brucellosis vaccines, recombinant and DNA vaccines, after conducting the research stages in large animals, can be a suitable approach to prevent the progress of brucellosis.

Single or multiple strains of mesophilic and thermophilic lactic acid bacteria are used as starter cultures in food industries to produce different types of fermented products. Preservation of these starter cultures is a crucial step in which the highest viability and genetic stability of the starter culture should be retained. Traditional methods for the preservation of starter cultures were mainly based on the freezing method. Nowadays, the usual method for the preservation of starter cultures is drying which mostly included spray drying and freeze-drying.

In this narrative review of studies, a comprehensive review is conducted on all methods for the preservation of lactic acid bacteria through searches in databases such as Google Scholar, Scopus, Pubmed, and other valid databases. After a glance at the types of preservation methods, advantages and disadvantages are compared and solutions to overcome the problem of survival have been introduced.

Comparisons of the preservation methods from different points of view in the present overview may help to design more effective research projects or production processes in this area.

Cockroaches are the most resistant urban and domestic pests in the world. Hence, investigations into alternative control strategies such as the use of active compounds of plants against this insect pest are important. In this study, Francoeuria undulata (L.) plants were collected from Isfahan province, Iran, then the essential oil of aerial parts of the plant was extracted by hydro-distillation. Plant essential oil was analyzed using GC/MS. German cockroaches, Blattella germanica L. (Blattodea: Ectobiidae), were obtained from the Tehran University of Medical Sciences. Different concentrations of F. undulata essential oil were prepared in acetone, and contact and repellency tests were carried out on German cockroaches. Moreover, 40 male rats were divided into 4 groups including 1. Control and 3 treated groups that received F. undulata oil with 5%, 15%, and 30% v/v concentrations once daily for 10 days. The blood samples were collected and biochemical parameters were assayed in serum. Also, the liver tissue was isolated for histopathological examination. The major components of the essential oil were 1,8-cineole (26.02%),  α-pinene (12.51%), Camphor (8.36%), and Camphene (5.03%). The results showed that the concentrations of 5%, 15%, and 30% v/v of F. undulata oil in 60 min of exposure had 100% insecticidal activity against German cockroaches. The repellency percentage of F. undulata oil at 5% concentration was not significant compared to the control, while the concentrations of 15% and 30% of essential oil showed a significant repellent effect on German cockroaches. Furthermore, the essential oil, at 5% concentration, was non-toxic to the livers of rats. The changes in the activities of aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase were also detected in the treated rats. Our findings revealed that the F. undulata essential oil has effective insecticidal activity against German cockroaches, making it a candidate for controlling this pest.